using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using PRSClasses;
using PRSServer.Properties;
using RazorEngine.Templating;
using RazorEngine.Text;
using Syncfusion.Pdf.Parsing;
using Color = System.Windows.Media.Color;
using ColorConverter = System.Windows.Media.ColorConverter;
using Encoder = System.Drawing.Imaging.Encoder;

namespace PRSServer
{
    /// <summary>
    ///     Provides utility functions for writing Razor template pages
    /// </summary>
    public class WebUtils
    {
        #region Entity Editor

        /// <summary>
        ///     Builds an editor for a given entity.
        /// </summary>
        /// <remarks>To get reasonable formatting, import <see cref="WebUtils.DigitalFormViewerStyle" /> in a &lt;style&gt; tag</remarks>
        /// <typeparam name="T">The type of <paramref name="entity" /></typeparam>
        /// <param name="entity">The entity which contains the data to be pre-inserted into the editor</param>
        /// <param name="id">An optional HTML id to add to root &lt;div&gt; of the generated item.</param>
        /// <param name="classList">An optional list of HTML classes to add to root &lt;div&gt; of the generated item.</param>
        /// <returns>A string containing raw HTML markup</returns>
        public static string BuildEntityEditor<T>(T entity, string? id = null, string[]? classList = null) where T : Entity
        {
            var builder = new StringBuilder();

            builder.AppendFormat(
                @"<div class=""prs-web_utils-entity_editor{0}""{1}>",
                classList != null ? " " + string.Join(" ", classList) : "",
                id != null ? " id=\"" + id + "\"" : ""
            );

            var layout = DFLayout.GenerateEntityLayout<T>();
            var data = WebHandler.SerializeEntityForEditing(typeof(T), entity);
            var markup = BuildDigitalFormViewer(layout, data, false, submitLabel: "Save", saveLabel: null);

            builder.Append(markup).Append("</div>");

            return builder.ToString();
        }

        #endregion

        #region CoreTable Viewer

        /// <summary>
        ///     Used for determining which columns to show in an HTML representation of a CoreTable.
        ///     EntityTableColumns.ALL means to show every column
        ///     EntityTableColumns.VISIBLE means only show columns which do not have their visiblity set to hidden
        ///     EntityTableColumns.REQUIRED means only show columns which have their visibility set to visible.
        ///     EntityTableColumns.LOOK_UP means to use the Lookup associated with the entity to generate the columns.
        /// </summary>
        public enum EntityTableColumns
        {
            ALL,
            VISIBLE,
            LOOKUP,
            REQUIRED
        }

        private static List<string> GetColumnsForTable<T>(EntityTableColumns showType = EntityTableColumns.ALL) where T : Entity
        {
            if (showType == EntityTableColumns.LOOKUP) return LookupFactory.DefineColumns(typeof(T)).ColumnNames().ToList<string>();
            var columns = new List<string>();

            var properties = CoreUtils.PropertyInfoList(
                typeof(T),
                x => x.GetCustomAttribute<DoNotPersist>() == null &&
                     x.GetCustomAttribute<DoNotSerialize>() == null &&
                     x.PropertyType != typeof(UserProperties), true);
            switch (showType)
            {
                case EntityTableColumns.VISIBLE:
                    foreach (var property in properties)
                    {
                        var editor = property.Value.GetEditor();
                        if (editor != null && editor.Visible != Visible.Hidden) columns.Add(property.Key);
                    }

                    break;
                case EntityTableColumns.REQUIRED:
                    foreach (var property in properties)
                    {
                        var editor = property.Value.GetEditor();
                        if (editor != null && editor.Visible == Visible.Default) columns.Add(property.Key);
                    }

                    break;
                case EntityTableColumns.ALL:
                    foreach (var property in properties.Keys) columns.Add(property);
                    break;
            }

            return columns;
        }

        /// <summary>
        ///     Returns a string containing an HTML table representing the data present in a CoreTable.
        /// </summary>
        /// <typeparam name="T">The type of the entity that the table represents.</typeparam>
        /// <param name="table">The table to be converted to HTML</param>
        /// <param name="showType">A flag to determine which columns to show.</param>
        /// <returns>The HTML string</returns>
        public static string BuildHTMLTableFromCoreTable<T>(CoreTable table, EntityTableColumns showType = EntityTableColumns.ALL) where T : Entity
        {
            var columns = GetColumnsForTable<T>(showType);

            var html = new List<string>();
            html.Add("<table class=\"prs-web_utils-entity_table entity-" + typeof(T).Name + "\"><caption>");
            html.Add(typeof(T).Name);
            html.Add("</caption><thead><tr>");
            foreach (var column in columns)
            {
                html.Add("<th>");
                html.Add(column);
                html.Add("</th>");
            }

            html.Add("</tr></thead>");

            foreach (var row in table.Rows)
            {
                html.Add("<tr>");
                foreach (var column in columns)
                {
                    html.Add("<td>");
                    html.Add(row.Get<object?>(column)?.ToString() ?? "NULL");
                    html.Add("</td>");
                }

                html.Add("</tr>");
            }

            html.Add("</table>");
            html.Add("</table>");

            return string.Concat(html);
        }

        /// <summary>
        ///     Returns a string containing an HTML table representing the data present in a CoreTable.
        /// </summary>
        /// <param name="entityType">The type of the entity that the table represents</param>
        /// <param name="table">The table to be converted to HTML</param>
        /// <param name="showType">A flag to determine which columns to show.</param>
        /// <returns>The HTML string</returns>
        public static string BuildHTMLTableFromCoreTable(Type entityType, CoreTable table, EntityTableColumns showType = EntityTableColumns.ALL)
        {
            var fnc = typeof(WebUtils).GetMethod(nameof(BuildHTMLTableFromCoreTable), 1, new[] { typeof(CoreTable), typeof(EntityTableColumns) })!
                .MakeGenericMethod(entityType);
            return (fnc.Invoke(null, new object[] { table, showType }) as string)!;
        }

        #endregion

        #region Extra Utilities

        public static string ConvertStringToPlainHTML(string text)
        {
            return text.Replace("&", "&amp;").Replace("<", "&lt;").Replace(">", "&gt;").Replace("\"", "&quot;").ReplaceLineEndings("<br/>");
        }

        public enum ImageEncoding
        {
            JPEG
        }

        private static ImageCodecInfo? GetEncoder(ImageFormat format)
        {
            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
            foreach (ImageCodecInfo codec in codecs)
            {
                if (codec.FormatID == format.Guid)
                {
                    return codec;
                }
            }
            return null;
        }

        public static List<byte[]> RenderPDFToImages(byte[] pdfData, ImageEncoding encoding = ImageEncoding.JPEG)
        {
            var rendered = new List<byte[]>();

            PdfLoadedDocument loadeddoc = new PdfLoadedDocument(pdfData);
            Bitmap[] images = loadeddoc.ExportAsImage(0, loadeddoc.Pages.Count - 1);

            var jpgEncoder = GetEncoder(ImageFormat.Jpeg)!;
            var quality = Encoder.Quality;
            var encodeParams = new EncoderParameters(1);
            encodeParams.Param[0] = new EncoderParameter(quality, 100L);

            if (images != null)
                foreach (var image in images)
                {
                    using(var data = new MemoryStream())
                    {
                        image.Save(data, jpgEncoder, encodeParams);
                        rendered.Add(data.ToArray());
                    }
                }

            return rendered;
        }

        private static readonly ImageConverter converter = new();

        public static string WebDocumentToDataURL(string code)
        {
            var document = new Client<Document>().Query(
                new Filter<Document>(x => x.ID)
                    .InQuery(new SubQuery<WebDocument>(
                        new Filter<WebDocument>(x => x.Code).IsEqualTo(code),
                        new Column<WebDocument>(x => x.Document.ID))),
                new Columns<Document>(x => x.Data));
            var data = (byte[]?)document.Rows.FirstOrDefault()?["Data"];
            return "data:;base64," + (data != null ? Convert.ToBase64String(data) : "");
        }

        public static Guid? WebDocumentID(string code)
        {
            var document = new Client<Document>().Query(
                new Filter<Document>(x => x.ID)
                    .InQuery(new SubQuery<WebDocument>(
                        new Filter<WebDocument>(x => x.Code).IsEqualTo(code),
                        new Column<WebDocument>(x => x.Document.ID))),
                new Columns<Document>(x => x.Data));
            return (Guid?)document.Rows.FirstOrDefault()?["ID"];
        }

        public static string ResourceToDataURL(Bitmap resource)
        {
            return "data:;base64," + Convert.ToBase64String((byte[])converter.ConvertTo(resource, typeof(byte[]))!);
        }

        #endregion

        #region Security

        public static bool UserCanAccess<T>(IDataModel model) where T : ISecurityDescriptor, new()
        {
            var userTable = model.GetTable<User>();
            if (userTable.Rows.Count == 0) return false;
            var user = userTable.Rows[0].ToObject<User>();
            return Security.IsAllowed<T>(user.ID, user.SecurityGroup.ID);
        }

        public static bool IsLoggedIn(IDataModel model)
        {
            var userTable = model.GetTable<User>();
            return userTable.Rows.Count > 0;
        }

        public static User? GetUser(IDataModel model)
        {
            var userTable = model.GetTable<User>();
            if (userTable.Rows.Count == 0) return null;
            return userTable.Rows[0].ToObject<User>();
        }

        #endregion

        #region Directory Viewer

        public static string DirectoryViewerStyle { get; } = @"<style>
.prs-web_utils-file_manager {
    width: 30em;
    height: 40em;
    padding: 0.5em; 

    text-align: left;

    overflow: auto;
    border: 1px solid black;
    background-color: white;

    box-sizing: border-box;
}

.prs-web_utils-file_manager * {
    box-sizing: border-box;
}

.prs-web_utils-file_manager-file,.prs-web_utils-file_manager-directory_head {
    font-size: 1em;
    color: black;
    width: 100%;

    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    
    text-align: left;
    
    padding-left: 1.5em;

    background-position: left;
    background-repeat: no-repeat;
    background-size: contain;
}
.prs-web_utils-file_manager-file {
    border: #0000 solid 1px;

    background-image: url(" + ResourceToDataURL(Resources.file) + @");
}
.prs-web_utils-file_manager-directory_head {
    background-color: white;
    background-image: url(" + ResourceToDataURL(Resources.folder) + @");
}
.prs-web_utils-file_manager-pdf_type {
    background-image: url(" + ResourceToDataURL(Resources.pdf) + @");
}
.prs-web_utils-file_manager-png_type {
    background-image: url(" + ResourceToDataURL(Resources.png) + @");
}
.prs-web_utils-file_manager-jpg_type {
    background-image: url(" + ResourceToDataURL(Resources.jpg) + @");
}
.prs-web_utils-file_manager-directory_head:active {
    cursor: pointer;
    background-color: #CCCCCC
}
@media (hover:hover) {
    .prs-web_utils-file_manager-directory_head:hover {
        cursor: pointer;
        background-color: #DDDDDD
    }
    .prs-web_utils-file_manager-file:hover {
        cursor: pointer;
        background-color: #b8d9e7;
        border: #79c4e5 solid 1px;
    }
}

.prs-web_utils-file_manager-download {
    display: inline-block;
    width: 1.5em;
    height: 1.5em;
    padding: 0.5em;
    float: right;
    border: solid 1px black;
    background-image: url(" + ResourceToDataURL(Resources.download) + @");
    background-size: 100% 100%;
}

.prs-web_utils-file_manager-directory {
    width: 100%;
    padding-left: 0.5em;
    border-left: dashed 1px #AAA;
    border-bottom: dashed 1px #AAA;
}
.prs-web_utils-file_manager-collapsed {
    display: none;
}
</style>";

        private interface IFileItem
        {
            public string FilePath { get; }
            public string FileName { get; }
        }

        private class FileItem : IFileItem
        {
            public FileItem(string filePath, string fileName)
            {
                FilePath = filePath;
                FileName = fileName;
            }

            public string FilePath { get; }
            public string FileName { get; }
        }

        private class DirectoryItem : IFileItem
        {
            public readonly List<DirectoryItem> Directories = new();
            public readonly List<FileItem> Files = new();

            public DirectoryItem(string filePath, string fileName)
            {
                FilePath = filePath;
                FileName = fileName;
            }

            public string FilePath { get; }
            public string FileName { get; }
        }

        private static DirectoryItem? GetDirectoryStructure(string path, Func<string, bool>? fileFilter, Func<string, bool>? directoryFilter,
            string? name = null, int depth = 2)
        {
            var fileName = name ?? path;
            if (depth == 0) return new DirectoryItem(path, fileName);
            if (!Directory.Exists(path)) return null;

            var directory = new DirectoryItem(path, fileName);
            foreach (var item in Directory.GetDirectories(path))
                if (directoryFilter?.Invoke(item) != false)
                    try
                    {
                        var subDirectory = GetDirectoryStructure(item, fileFilter, directoryFilter, Path.GetFileName(item), depth - 1);
                        if (subDirectory != null) directory.Directories.Add(subDirectory);
                    }
                    catch (UnauthorizedAccessException)
                    {
                    }

            foreach (var item in Directory.GetFiles(path))
                if (fileFilter?.Invoke(item) != false)
                    directory.Files.Add(new FileItem(item, Path.GetFileName(item)));
            return directory;
        }

        private static DirectoryItem? GetDirectoryStructure(string path, string? fileFilter, string? directoryFilter, string? name = null,
            int depth = 2)
        {
            var fileFilterRgx = fileFilter != null ? new Regex(fileFilter) : null;
            var dirFilterRgx = directoryFilter != null ? new Regex(directoryFilter) : null;

            return GetDirectoryStructure(
                path,
                fileFilterRgx != null ? x => fileFilterRgx.IsMatch(x) : null,
                dirFilterRgx != null ? x => dirFilterRgx.IsMatch(x) : null,
                name, depth
            );
        }

        private static readonly string DirectoryViewerScript = @"<script>

function headClickEventListener(e){
    var next = e.target.nextSibling;
    next.classList.toggle(""prs-web_utils-file_manager-collapsed"");
}

var heads = document.getElementsByClassName(""prs-web_utils-file_manager-directory_head"");
for(var head of heads){
    head.addEventListener(""click"", headClickEventListener);
}

</script>";

        private static void BuildDirectory(StringBuilder builder, DirectoryItem directory)
        {
            builder.Append(@"<div class=""prs-web_utils-file_manager-directory_head"">");
            builder.Append(directory.FileName);
            builder.Append(@"</div>");

            builder.Append(@"<div class=""prs-web_utils-file_manager-directory prs-web_utils-file_manager-collapsed""/>");

            if (directory.Directories.Count == 0 && directory.Files.Count == 0)
            {
                builder.Append(@"Folder is empty");
            }
            else
            {
                foreach (var subDirectory in directory.Directories) BuildDirectory(builder, subDirectory);
                foreach (var file in directory.Files)
                {
                    var typeClass = Path.GetExtension(file.FileName) switch
                    {
                        ".png" => "prs-web_utils-file_manager-png_type",
                        ".pdf" => "prs-web_utils-file_manager-pdf_type",
                        ".jpg" => "prs-web_utils-file_manager-jpg_type",
                        ".jpeg" => "prs-web_utils-file_manager-jpg_type",
                        _ => null
                    };

                    builder.Append(@"<div class=""prs-web_utils-file_manager-file");
                    if (typeClass != null) builder.Append(" " + typeClass);
                    builder.Append(string.Format(@""" data-file=""{0}"">", file.FilePath));
                    builder.Append(@"<div class=""prs-web_utils-file_manager-download""></div>");
                    builder.Append(file.FileName);


                    builder.Append(@"</div>");
                }
            }

            builder.Append(@"</div>");
        }

        /// <summary>
        /// </summary>
        /// <param name="path">The path to the folder in which to initialise the directory viewer</param>
        /// <param name="fileFilter">A file filter which is compiled to a Regex. Regex.IsMatch is used to filter files</param>
        /// <param name="directoryFilter">
        ///     A directory filter which is compiled to a Regex. Regex.IsMatch is used to filter
        ///     directories
        /// </param>
        /// <param name="alias">The name to call the root folder. If null, defaults to the directory path.</param>
        /// <param name="id">An HTML id attribute for the viewer</param>
        /// <param name="classList">An HTML class list for the viewer</param>
        /// <param name="depth">The depth of directories to search</param>
        /// <returns></returns>
        public static string BuildDirectoryViewer(string path, Func<string, bool> fileFilter, Func<string, bool>? directoryFilter = null,
            string? alias = null, string? id = null, string[]? classList = null, int depth = 2)
        {
            var stringBuilder = new StringBuilder();


            stringBuilder.Append(@"<div ");
            if (id != null) stringBuilder.Append("id=\"" + id + "\" ");
            stringBuilder.Append(@"class=""prs-web_utils-file_manager");
            if (classList != null)
                foreach (var className in classList)
                    stringBuilder.Append(" " + className);
            stringBuilder.Append(@""">");

            var structure = GetDirectoryStructure(path, fileFilter, directoryFilter, alias ?? path, depth);
            if (structure != null) BuildDirectory(stringBuilder, structure);
            stringBuilder.Append(@"</div>");

            stringBuilder.Append(DirectoryViewerScript);

            return stringBuilder.ToString();
        }

        public static string BuildDirectoryViewer(string path, string fileFilter, string? directoryFilter = null, string? alias = null,
            string? id = null,
            string[]? classList = null, int depth = 2)
        {
            var fileFilterRgx = new Regex(fileFilter);
            var dirFilterRgx = directoryFilter != null ? new Regex(directoryFilter) : null;

            return BuildDirectoryViewer(
                path,
                x => fileFilterRgx.IsMatch(x),
                dirFilterRgx != null ? x => dirFilterRgx.IsMatch(x) : null,
                alias, id, classList, depth
            );
        }

        #endregion

        #region JSON Entities

        public static Dictionary<string, object> SerializeEntity(Type entityType, Entity entity)
        {
            var data = new Dictionary<string, object>();
            foreach (var property in DatabaseSchema.Properties(entityType))
            {
                data[property.Name] = CoreUtils.GetPropertyValue(entity, property.Name);
            }

            return data;
        }

        /// <summary>
        /// Generates a JSON object for javascript
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="entity"></param>
        /// <returns></returns>
        public static string EntityToJSON<T>(T entity) where T : Entity
        {
            var serializedEntity = SerializeEntity(typeof(T), entity);
            var serializedJSON = Serialization.Serialize(serializedEntity);
            return serializedJSON;
        }

        public static string CreateJSONEntity<T>() where T : Entity, new()
        {
            var serializedEntity = SerializeEntity(typeof(T), new T());
            var serializedJSON = Serialization.Serialize(serializedEntity);
            return serializedJSON;
        }

        /// <summary>
        /// Generate code for setting a property of a JSON entity
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="entityExpr">A Javascript expression that evaluates to the entity JSON</param>
        /// <param name="expression"></param>
        /// <returns></returns>
        public static string JSONSetProperty<T>(string entityExpr, Expression<Func<T, object>> expression, string value) where T : Entity
        {
            var propName = CoreUtils.GetFullPropertyName(expression, ".");
            return $"({entityExpr})[\"{propName}\"]={value}";
        }

        /// <summary>
        /// Generate code for getting a property of a JSON entity
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="entityExpr">A Javascript expression that evaluates to the entity JSON</param>
        /// <param name="expression"></param>
        /// <returns></returns>
        public static string JSONGetProperty<T>(string entityExpr, Expression<Func<T, object>> expression) where T : Entity
        {
            var propName = CoreUtils.GetFullPropertyName(expression, ".");
            return $"({entityExpr})[\"{propName}\"]";
        }

        #endregion

        #region Digital Form Viewer

        private const string _multiImageStyle = @"
.prs-web_utils-digital_form-multi_image {
    
}
.prs-web_utils-digital_form-multi_image_cont {
    overflow: auto;
    position: relative;

    height: 10em;

    background: #999;
    box-shadow: black inset 0 0 4px;
}

.prs-web_utils-digital_form-multi_image_cont > div {
    position: absolute;
    top: 0;
    bottom: 0;
    display: flex;

    gap: 1em;
    padding: 0.4em;
}

.prs-web_utils-digital_form-multi_image_cont img {
    max-height: 100%;
}

.prs-web_utils-digital_form-multi_image_cont img.selected {
    border: dashed 2px black;
}

.prs-web_utils-digital_form-multi_image_btns {
    display: flex;
    gap: 0.2em;
}

.prs-web_utils-digital_form-multi_image_btns .prs-button {
    flex: 1;
    height: 4em;

    display: flex;
    justify-content: center;
    align-items: center;
}
";

        private static string _digitalFormViewerStyle = @"
.prs-web_utils-digital_form {
    display: grid;
    column-gap: 0.4em;
    row-gap: 0.4em;
}
.prs-web_utils-digital_form-field {
    min-height: 2em;
}
@media (pointer:coarse), (pointer:none) {
    .prs-web_utils-digital_form-field {
        min-height: 4em;
    }
}
.prs-web_utils-digital_form * {
    box-sizing: border-box;
}

.prs-web_utils-digital_form-label {
    text-align: left;
    padding: 1.5em 0.3em;
    align-self: center;
    overflow-wrap: anywhere;
}
.prs-web_utils-digital_form-image {
    max-width: 100%;
    max-height: 100%;
}
.prs-web_utils-digital_form-color,
.prs-web_utils-digital_form-integer,
.prs-web_utils-digital_form-text,
.prs-web_utils-digital_form-string,
.prs-web_utils-digital_form-url,
.prs-web_utils-digital_form-password,
.prs-web_utils-digital_form-date,
.prs-web_utils-digital_form-datetime {
    background-color: white;
}

.prs-web_utils-digital_form-time {
    display: flex;
    align-items: center;

    width: min-content;
    
    background: white;
    border: solid 1px gray;
}
.prs-web_utils-digital_form-time_hours {
    text-align: right;
}
.prs-web_utils-digital_form-time_mins {
    text-align: left;
}
.prs-web_utils-digital_form-time span {
    margin: 0.1em;
}
.prs-web_utils-digital_form-time input {
    height: 100%;
    width: 3em;

    font-family: monospace;

    border: none;
    background: none;
}
.prs-web_utils-digital_form-time input:active {
    background: #ddd;
}

.prs-web_utils-digital_form-timestamp {
    display: flex;
    justify-content: space-between;
    align-items: center;

    gap: 0.4em;
}
.prs-web_utils-digital_form-timestamp input {
    flex: 1;
    height: 100%;
}
.prs-web_utils-digital_form-timestamp .prs-button {
    height: 100%;
    padding: 1em;

    display: flex;
    align-items: center;
}

.prs-web_utils-digital_form-pin {
    display: flex;
    justify-content: space-between;
    align-items: center;

    gap: 0.4em;
}
.prs-web_utils-digital_form-pin input {
    flex: 1;
    height: 100%;
}
.prs-web_utils-digital_form-pin .prs-button {
    height: 100%;
    padding: 1em;

    display: flex;
    align-items: center;
}

.prs-web_utils-digital_form-document {
    display: flex;
    justify-content: space-between;
    align-items: center;

    gap: 0.4em;
}
.prs-web_utils-digital_form-document input {
    flex: 1;
    height: 100%;
}
.prs-web_utils-digital_form-document .prs-button {
    height: 100%;
    padding: 1em;

    display: flex;
    align-items: center;
}

.prs-web_utils-digital_form-notes {
    display: flex;
    gap: 0.2em;
}
.prs-web_utils-digital_form-note_cont {
    flex: 1;
    
    display: flex;
    flex-direction: column;
    gap: 0.2em;
}
.prs-web_utils-digital_form-note {
    resize: none;
    width: 100%;
    min-height: 6em;
    
    background-color: #cdcdcd;
}
.prs-web_utils-digital_form-note.active {
    background-color: lightgoldenrodyellow;
}
.prs-web_utils-digital_form-note_error {
    color: black;
    text-align: left;
}
.prs-web_utils-digital_form-note_add {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;

    background-color: #dedede;
    border: solid 1px black;
    border-radius: 3px;

    user-select: none;
    
    width: 2em;
}
@media (hover:hover) {
    .prs-web_utils-digital_form-note_add:hover {
        cursor: pointer;
        background-color: #cacaca;
    }
}
.prs-web_utils-digital_form-note_add:active {
    background-color: #ccc;
}

.prs-web_utils-digital_form-embedded_image, .prs-web_utils-digital_form-signature {
    max-width: 100%;
    border-radius: 3px;
    min-height: 2em;

    display: flex;
    flex-direction: column;
}
.prs-web_utils-digital_form-img_cont {
    flex: 1;
    overflow: hidden;
}
.prs-web_utils-digital_form-clear_img {
    height: 4em;
    display: flex;
    justify-content: center;
    align-items: center;
}

.prs-web_utils-digital_form-img {
    max-width: 100%;
    max-height: 100%;
}

div.prs-web_utils-digital_form-boolean {
    display: flex;
    align-items: center;
    gap: 0.2em;
}
.prs-web_utils-digital_form-boolean label {
    flex: 1;
    text-align: left;
}
input.prs-web_utils-digital_form-boolean {
    width: min-content;
    height: min-content;
    margin: auto;
}

.prs-web_utils-digital_form-lookup, .prs-web_utils-digital_form-option {
    min-width: 0;
    min-height: 2em;
    background-color: white;
}
.prs-web_utils-digital_form-option_fake {
    visibility:hidden;
    margin-left:1em;
    overflow:hidden;
    min-height: 2em;
}

.prs-web_utils-digital_form-boolean .prs-web_utils-digital_form-button {
    display: inline-block;
    flex: 1;
    height: 100%;

    position: relative;
    height: 2em;
    
    background: none;
    border: none;
}
.prs-web_utils-digital_form-boolean .prs-web_utils-digital_form-button input {
    appearance: none;
    background-color: #a7a7a7;
    border-radius: 3px;
    border: dashed 1px black;

    margin: 0;
    
    width: 100%;
    height: 100%;
}
.prs-web_utils-digital_form-boolean .prs-web_utils-digital_form-button input:checked {
    background-color: #e7e7e7;
    border: solid 1px black;
}
@media (hover:hover) {
    .prs-web_utils-digital_form-boolean .prs-web_utils-digital_form-button input:hover {
        cursor:pointer;
        background-color: #a3a3a3;
    }
    .prs-web_utils-digital_form-boolean .prs-web_utils-digital_form-button input:checked:hover {
        background-color: #e0e0e0;
    }
}
.prs-web_utils-digital_form-boolean .prs-web_utils-digital_form-button input:active {
    background-color: #979797;
}
.prs-web_utils-digital_form-boolean .prs-web_utils-digital_form-button input:checked:active {
    background-color: #c6c6c6;
}

.prs-web_utils-digital_form-boolean .prs-web_utils-digital_form-button span {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    pointer-events: none;
    
    line-height: 2em;
}

.prs-web_utils-digital_form-radio_cont {
    display: flex;
    justify-content: stretch;
    align-items: center;
}
.prs-web_utils-digital_form-radio_cont label {
    flex: 1;
    text-align: left;
}

.prs-web_utils-digital_form-save_cont {
    margin-top: 2em;
    display: flex;
    gap: 0.2em;
}

.prs-web_utils-digital_form-save_cont .prs-button {
    height: 4em;

    flex: 1;

    display: flex;
    align-items: center;
    justify-content: center;
}

.prs-web_utils-digital_form-add_task {
    display: flex;
    gap: 0.4em;
}
.prs-web_utils-digital_form-add_task .prs-button {
    height: 4em;
    padding: 0 1em;
    
    display: flex;
    align-items: center;
    justify-content: center;
}
.prs-web_utils-digital_form-add_task input {
    flex: 1;
}

.prs-web_utils-digital_form input:invalid {
    background-color: #FFDDDD;
}

.prs-web_utils-digital_form-field:required {
    border: solid 1px #edaf58;
}

.prs-web_utils-digital_form-validate {
    position: absolute;
    top: 1em;
    left: 1em;

    height: 3em;
    line-height: 3em;
    padding: 0 1em;

    background: white;
    border: black solid 1px;
    border-radius: 3px;
    box-shadow: grey 0 0 10px;

    transition: opacity 1s linear 0s;
}

" + _multiImageStyle;

        /// <summary>
        ///     A string which contains a stylesheet used for formatting digital forms. This is not necessary, but can be useful as
        ///     a base.<br />
        ///     Include within the &lt;style&gt; tag in your document head.
        /// </summary>
        public static string DigitalFormViewerStyle => _digitalFormViewerStyle;

        private const string _submitScript = @"
var submitButtons = document.getElementsByClassName(""prs-web_utils-digital_form-submit"");
var saveButtons = document.getElementsByClassName(""prs-web_utils-digital_form-save"");
function getData(element){
    if(element.classList.contains(""prs-web_utils-digital_form-double"")
            || element.classList.contains(""prs-web_utils-digital_form-integer"")){
        var res = element.valueAsNumber;
        if(Number.isNaN(res)){
            return null;
        }
        return res;
    } else if(element.classList.contains(""prs-web_utils-digital_form-color"")){
        return ""#FF"" + element.value.substring(1).toUpperCase();
    } else if(element.classList.contains(""prs-web_utils-digital_form-multi_image"")){

        let imgCont = element.getElementsByClassName(""prs-web_utils-digital_form-multi_image_cont"")[0];
        let imgContDiv = imgCont.children[0];
        
        let imgs = [];
        for(let img of imgContDiv.children){
            imgs.push(img.src.replace(/^data:(.*,)?/, ''));
        }
        return imgs;
    } else if(element.classList.contains(""prs-web_utils-digital_form-notes"")){
        let cont = element.getElementsByClassName(""prs-web_utils-digital_form-note_cont"")[0];
        let retVal = [];
        for(let note of cont.children){
            retVal.push(note.value);
        }
        if(!(/\S/.test(retVal[retVal.length - 1]))){
            retVal.pop();
        }

        return retVal;
    } else if(element.classList.contains(""prs-web_utils-digital_form-time"")){
        let hours = element.getElementsByClassName(""prs-web_utils-digital_form-time_hours"")[0];
        let mins = element.getElementsByClassName(""prs-web_utils-digital_form-time_mins"")[0];
        return hours.value + "":"" + mins.value;
    } else if(element.classList.contains(""prs-web_utils-digital_form-date"")
            || element.classList.contains(""prs-web_utils-digital_form-datetime"")){
        return element.value;
    } else if(element.classList.contains(""prs-web_utils-digital_form-pin"")){
        let pinText = element.getElementsByClassName(""prs-web_utils-digital_form-pin_text"")[0];
        return pinText.value;
    } else if(element.classList.contains(""prs-web_utils-digital_form-timestamp"")){
        let dateText = element.getElementsByClassName(""prs-web_utils-digital_form-timestamp_date"")[0];
        return dateText.value;
    } else if(element.classList.contains(""prs-web_utils-digital_form-text"")
            || element.classList.contains(""prs-web_utils-digital_form-string"")
            || element.classList.contains(""prs-web_utils-digital_form-password"")
            || element.classList.contains(""prs-web_utils-digital_form-url"")
            || element.classList.contains(""prs-web_utils-digital_form-code"")
            || element.classList.contains(""prs-web_utils-digital_form-option"")){
        return element.value;
    } else if(element.classList.contains(""prs-web_utils-digital_form-radio_cont"")){
        var options = element.getElementsByTagName(""input"");
        for(let option of options){
            if(option.checked){
                return option.value;
            }
        }
        return null;
    } else if(element.classList.contains(""prs-web_utils-digital_form-lookup"")){
        return element.value;
    } else if(element.classList.contains(""prs-web_utils-digital_form-embedded_image"")
            || element.classList.contains(""prs-web_utils-digital_form-signature"")){
        var imgs = element.getElementsByClassName(""prs-web_utils-digital_form-img"");
        if(imgs.length == 0){
            return null;
        } else {
            var img = imgs[0];
            var src = img.getAttribute(""src"");

            var match = /data:[^;]*;base64,/d.exec(src);
            if(match){
                return src.substring(match.indices[0][1]);
            }
            return null;
        }
    } else if(element.classList.contains(""prs-web_utils-digital_form-document"")){
        return element.getAttribute(""data-id"");
    } else if(element.classList.contains(""prs-web_utils-digital_form-boolean"")){
        if(element.tagName == ""INPUT""){
            return element.checked;
        } else if(element.tagName == ""SELECT""){
            if(element.selectedOptions.length > 0){
                return element.selectedOptions[0].hasAttribute(""data-true"");
            }
            return null;
        } else if(element.tagName == ""DIV""){
            for(var element of element.getElementsByTagName(""input"")){
                if(element.checked){
                    return element.hasAttribute(""data-true"");
                }
            }
            return null;
        }
    } else if(element.classList.contains(""prs-web_utils-digital_form-add_task"")){
        var input = element.getElementsByTagName(""input"")[0];
        return input.value;
    }
}

function validate(element){
    let valid = true;
    let err = """";
    if(element.classList.contains(""prs-web_utils-digital_form-embedded_image"")
            || element.classList.contains(""prs-web_utils-digital_form-signature"")){
        let imgCont = element.getElementsByClassName(""prs-web_utils-digital_form-img_cont"")[0];
        let imgs = imgCont.getElementsByTagName(""img"");
        if(imgs.length == 0){
            valid = false;
            err = ""Please provide an image"";
        }
    } else if(element.classList.contains(""prs-web_utils-digital_form-multi_image"")){
        let imgCont = element.getElementsByClassName(""prs-web_utils-digital_form-multi_image_cont"")[0];
        let imgContDiv = imgCont.children[0];
        if(imgContDiv.children.length == 0){
            valid = false;
            err = ""Please provide at least one image"";
        }
    }
    return [valid, err];
}

function doValidationCheck(form){
    var validations = form.getElementsByClassName(""prs-web_utils-digital_form-validate"");
    for(let validation of validations){
        validation.remove();
    }

    if(!form.reportValidity()){ return false; }
    
    let valid = true;
    var elements = form.getElementsByClassName(""prs-web_utils-digital_form-field"");
    for(var element of elements){
        if(element.hasAttribute(""required"")){
            var [elValid, err] = validate(element);
            valid = elValid && valid;
            if(!elValid){
                element.scrollIntoView();

                let validation = document.createElement(""div"");
                validation.classList.add(""prs-web_utils-digital_form-validate"");
                validation.textContent = err;
                element.style.position = ""relative"";
                element.appendChild(validation);
                setTimeout(() => {validation.style.opacity = 0;}, 5000);
            }
        }
    }

    return valid;
}

function submitForm(form, save, validate = true){
    if(!validate || doValidationCheck(form)){
        var formData = {};
    
        var elements = form.getElementsByClassName(""prs-web_utils-digital_form-field"");
        for(var element of elements){
            formData[element.getAttribute(""name"")] = getData(element);
            if(element.classList.contains(""prs-web_utils-digital_form-lookup"")){
                for(var option of element.getElementsByTagName(""option"")){
                    if(option.value == element.value){
                        formData[element.getAttribute(""name"") + ""$ID""] = option.getAttribute(""data-id"");
                        break;
                    }
                }
            }
        }

        let eventName = save ? ""prs-web_utils-df_save"" : ""prs-web_utils-df_submit"";
        const submitFormEvent = new CustomEvent(eventName, { detail: { formData: formData } });
        form.dispatchEvent(submitFormEvent);
    }
}
for(var btn of submitButtons){
    btn.addEventListener(""click"", function(e) {
        var form = e.target.parentNode.parentNode;
        submitForm(form, false, true);
    });
}
for(var btn of saveButtons){
    btn.addEventListener(""click"", function(e) {
        var form = e.target.parentNode.parentNode;
        submitForm(form, true, false);
    });
}
";

        private static string GetDigitalFormViewerScript()
        {
            return @"<script>

function checkDisabled(target, fnc){
    target.addEventListener(""click"", function(e){
        return !target.hasAttribute(""disabled"") ? fnc(e) : null;
    });
}

var integerFields = document.getElementsByClassName(""prs-web_utils-digital_form-integer"");
function integerValidator(e)
{
    e.target.value = Math.floor(e.target.value);
}
for(var field of integerFields){
    field.addEventListener(""change"", integerValidator);
}

function changeSelect(e){
    var parent = e.target.parentNode;
    var label = parent.getElementsByTagName(""div"")[0];
    label.textContent = e.target.value;
}
var optionCont = document.getElementsByClassName(""prs-web_utils-digital_form-option_cont"");
for(var option of optionCont){
    var select = option.getElementsByTagName(""select"")[0];
    select.setAttribute(""style"", ""position: absolute;top:0;left:0;right:0;bottom:0;"");
    select.addEventListener(""change"", changeSelect);
}

function saveDocument(filename, data, onResponse){
    var xhr = new XMLHttpRequest();
    xhr.open(""POST"", ""/save/Document"");
    xhr.setRequestHeader(""Content-Type"", ""application/json"");

    xhr.responseType = ""json"";
    xhr.onreadystatechange = function(){
        if(xhr.readyState === 4){
            onResponse(xhr.response);
        }
    }
    xhr.send(JSON.stringify({
        ""FileName"": filename,
        ""Data"": data
    }));
}
function selectDocument(e){
    var editor = e.target.parentNode;
    var filename = editor.getElementsByClassName(""prs-web_utils-digital_form-filename"")[0];

    var accept = filename.getAttribute(""accept"");
    
    var input = document.createElement(""input"");
    input.type = ""file"";
    input.setAttribute(""accept"", accept);
    input.onchange = e => {
        var file = e.target.files[0];
        var reader = new FileReader();
        reader.onloadend = (re) => {
            saveDocument(file.name, reader.result.replace(/^data:(.*,)?/, ''), function(data){
                filename.value = data[""FileName""];
                editor.setAttribute(""data-id"", data[""ID""]);
            });
        };
        reader.readAsDataURL(file);
    };
    input.click();
}
function clearDocument(e){
    var editor = e.target.parentNode;
    editor.removeAttribute(""data-id"");
    var filenameEl = editor.getElementsByClassName(""prs-web_utils-digital_form-filename"")[0];
    filenameEl.value = """";
}
function viewDocument(e){
    var editor = e.target.parentNode;
    if(editor.hasAttribute(""data-id"")){
        var id = editor.getAttribute(""data-id"");

        var filenameEl = editor.getElementsByClassName(""prs-web_utils-digital_form-filename"")[0];
        console.log(filenameEl.value);
        const viewDocEvent = new CustomEvent(""prs-web_utils-df_view_doc"", { detail: { id: id, filename: filenameEl.value } });
        editor.dispatchEvent(viewDocEvent);
    }
}
var docSelectBtns = document.getElementsByClassName(""prs-web_utils-digital_form-select_doc"");
var docClearBtns = document.getElementsByClassName(""prs-web_utils-digital_form-clear_doc"");
var docViewBtns = document.getElementsByClassName(""prs-web_utils-digital_form-view_doc"");
for(var docSelect of docSelectBtns){
    checkDisabled(docSelect, selectDocument);
}
for(var docClear of docClearBtns){
    checkDisabled(docClear, clearDocument);
}
for(var docView of docViewBtns){
    checkDisabled(docView, viewDocument);
}

function createPIN(e){
    var editor = e.target.parentNode;
   
    var length = parseInt(editor.getAttribute(""data-length""), 10);

    var pinEl = editor.getElementsByClassName(""prs-web_utils-digital_form-pin_text"")[0];

    pinEl.value = """";
    for(let i = 0; i < length; i++){
        pinEl.value += Math.floor(Math.random() * 10).toString();
    }
}
function clearPIN(e){
    var editor = e.target.parentNode;
    var pinEl = editor.getElementsByClassName(""prs-web_utils-digital_form-pin_text"")[0];
    pinEl.value = """";
}
var pinCreateBtns = document.getElementsByClassName(""prs-web_utils-digital_form-create_pin"");
var pinClearBtns = document.getElementsByClassName(""prs-web_utils-digital_form-clear_pin"");
for(var pinCreate of pinCreateBtns){
    checkDisabled(pinCreate, createPIN);
}
for(var pinClear of pinClearBtns){
    checkDisabled(pinClear, clearPIN);
}

function toggleStamp(e){
    var editor = e.target.parentNode;
    var stampEl = editor.getElementsByClassName(""prs-web_utils-digital_form-timestamp_date"")[0];
    if(/\S/.test(stampEl.value)){
        stampEl.value = """";
        e.target.textContent = ""Set"";
    } else {
        var dateString = (new Date()).toISOString();

        stampEl.value = dateString.substring(0, dateString.length - 1);
        e.target.textContent = ""Clear"";
    }
}
var pinToggleBtns = document.getElementsByClassName(""prs-web_utils-digital_form-toggle_stamp"");
for(var pinToggle of pinToggleBtns){
    checkDisabled(pinToggle, toggleStamp);
}

var embedImageFields = document.getElementsByClassName(""prs-web_utils-digital_form-embedded_image"");
var signatureFields = document.getElementsByClassName(""prs-web_utils-digital_form-signature"");
function fileSelector(e)
{
    var selectedFile = e.target.files[0];
    var target = e.target;
    var parent = e.target.parentNode;

    let clearButton = parent.nextSibling;
    
    var img = document.createElement(""img"");
    img.classList.add(""prs-web_utils-digital_form-img"");

    const reader = new FileReader();
    reader.onload = (e) => {
        img.src = e.target.result;
        clearButton.removeAttribute(""disabled"");
    }
    reader.readAsDataURL(selectedFile);
    
    parent.replaceChildren(img, target);
}
function fileButton(field, fileElement){
    field.addEventListener(""click"", (e) => {
        fileElement.click();
    });
}

function clearEmbeddedImage(e){
    let imgField = e.target.parentNode;
    let imgCont = imgField.children[0];

    let span = document.createElement(""span"");
    span.textContent = ""Choose a file"";

    imgCont.replaceChildren(span, imgCont.children[1]);
    e.target.setAttribute(""disabled"", """");
}

var clearButtons = [];
for(var field of embedImageFields){
    var imgElement = field.getElementsByClassName(""prs-web_utils-digital_form-img_cont"")[0];
    var fileElement = field.getElementsByTagName(""input"")[0];
    fileButton(imgElement, fileElement);
    fileElement.addEventListener(""change"", fileSelector);
    clearButtons.push(field.getElementsByClassName(""prs-web_utils-digital_form-clear_img"")[0]);
}
for(var field of signatureFields){
    var imgElement = field.getElementsByClassName(""prs-web_utils-digital_form-img_cont"")[0];
    var fileElement = field.getElementsByTagName(""input"")[0];
    fileButton(imgElement, fileElement);
    fileElement.addEventListener(""change"", fileSelector);
    clearButtons.push(field.getElementsByClassName(""prs-web_utils-digital_form-clear_img"")[0]);
}
for(let clearButton of clearButtons){
    checkDisabled(clearButton, clearEmbeddedImage);
}

function enableMultiImageRem(multiImage, enabled = true){
    if(!multiImage.hasAttribute(""disabled"")){
        var btn = multiImage.getElementsByClassName(""prs-web_utils-digital_form-multi_image_remove"")[0];
        if(enabled){
            btn.removeAttribute(""disabled"");
        } else {
            btn.setAttribute(""disabled"", """");
        }
    }
}
function multiImageClick(e){
    var multiImage = e.target.parentNode.parentNode.parentNode;

    for(let img of e.target.parentNode.children){
        img.classList.remove(""selected"");
    }
    e.target.classList.add(""selected"");
    enableMultiImageRem(multiImage);
}
var multiImages = document.getElementsByClassName(""prs-web_utils-digital_form-multi_image"");
for(let multiImg of multiImages){
    var imgs = multiImg.getElementsByClassName(""prs-web_utils-digital_form-multi_image_cont"")[0].getElementsByTagName(""img"");
    for(let img of imgs){
        img.addEventListener(""click"", multiImageClick);
    }
}
function multiImageRemove(e){
    let multiImage = e.target.parentNode.parentNode;
    let imgList = multiImage.getElementsByClassName(""prs-web_utils-digital_form-multi_image_cont"")[0].children[0];
    for(let img of imgList.children){
        if(img.classList.contains(""selected"")){
            imgList.removeChild(img);
        }
    }
    enableMultiImageRem(multiImage, false);
}
function multiImageAdd(e){
    let multiImage = e.target.parentNode.parentNode;
    let imgCont = multiImage.getElementsByClassName(""prs-web_utils-digital_form-multi_image_cont"")[0];
    let imgContDiv = imgCont.children[0];

    var input = document.createElement(""input"");
    input.type = ""file"";
    input.setAttribute(""accept"", ""image/*"");
    input.onchange = e => {
        var file = e.target.files[0];
        var reader = new FileReader();
        reader.onloadend = (re) => {
            var img = document.createElement(""img"");
            img.src = reader.result;
            img.addEventListener(""click"", multiImageClick);
            imgContDiv.appendChild(img);
        };
        reader.readAsDataURL(file);
    };
    input.click();
}
var multiImageAddBtns = document.getElementsByClassName(""prs-web_utils-digital_form-multi_image_add"");
var multiImageRemBtns = document.getElementsByClassName(""prs-web_utils-digital_form-multi_image_remove"");
for(var multiImageBtn of multiImageAddBtns){
    checkDisabled(multiImageBtn, multiImageAdd);
}
for(var multiImageBtn of multiImageRemBtns){
    checkDisabled(multiImageBtn, multiImageRemove);
}

function addNote(e){
    let notesCont = e.target.parentNode.getElementsByClassName(""prs-web_utils-digital_form-note_cont"")[0];
    let noteChildren = notesCont.getElementsByClassName(""prs-web_utils-digital_form-note"");
    let lastChild = noteChildren[noteChildren.length - 1];
    let error = notesCont.getElementsByClassName(""prs-web_utils-digital_form-note_error"")[0];

    if(/\S/.test(lastChild.value)){
        lastChild.classList.remove(""active"");
        lastChild.setAttribute(""disabled"", """");
            
        let newNotes = document.createElement(""textarea"");
        newNotes.classList.add(""prs-web_utils-digital_form-note"");
        newNotes.classList.add(""active"");
        notesCont.insertBefore(newNotes, error);
            
        error.textContent = """";
    } else {
        error.textContent = ""Please enter a note!"";
    }
}
var notesAddButtons = document.getElementsByClassName(""prs-web_utils-digital_form-note_add"");
for(let noteAdd of notesAddButtons){
    checkDisabled(noteAdd, addNote);
}

function addTask(e){
    let field = e.target.parentNode;
    let kanbanType = field.getAttribute(""data-tasktype"");
    let kanban = " + WebUtils.CreateJSONEntity<Kanban>() + ";" + 
    WebUtils.JSONSetProperty<Kanban>("kanban", x => x.Type.ID, "kanbanType") + @";

    let eventName = ""prs-web_utils-df_add_task"";
    const addTaskEvent = new CustomEvent(eventName, { detail: {
        kanban: kanban,
        setTaskNumber: function(number){" +
            WebUtils.JSONSetProperty<Kanban>("kanban", x => x.Number, "number") + @";
            var input = field.getElementsByTagName(""input"")[0];
            input.value = number.toString();
            var btn = field.getElementsByClassName(""prs-button"")[0];
            btn.setAttribute(""disabled"", """");

            submitForm(field.closest("".prs-web_utils-digital_form""), true, false);
        }
    }});
    form.dispatchEvent(addTaskEvent);
}
var addTaskFields = document.getElementsByClassName(""prs-web_utils-digital_form-add_task"");
for(let addTaskField of addTaskFields){
    let addTaskBtn = addTaskField.getElementsByClassName(""prs-button"")[0];
    checkDisabled(addTaskBtn, addTask);
}
" + _submitScript + "</script>";
        }

        public static string DigitalFormViewerScript => GetDigitalFormViewerScript();

        private static string BuildLookupField(
            IEnumerable<Tuple<string, string?>> options,
            string? selectedString,
            string style,
            string className,
            bool readOnly,
            bool required,
            string name
        )
        {
            var element = new StringBuilder(
                string.Format(@"<div class=""prs-web_utils-digital_form-option_cont"" style=""{0}position: relative;font-size: 1.2em;"">", style));

            var childOptions = new StringBuilder();

            var display = selectedString ?? "";
            foreach (var option in options)
            {
                var idString = option.Item2 != null ? $" data-id=\"{option.Item2}\"" : "";
                childOptions.Append($"<option{(option.Item1 == selectedString ? " selected" : "")} value=\"{option.Item1}\"{idString}>{option.Item1}</option>");
            }

            element.AppendFormat(
                @"<div class=""prs-web_utils-digital_form-option_fake"">{0}</div><select name=""{1}"" class=""{2}""{3}{4}><option></option>",
                display,
                name,
                className,
                readOnly ? " disabled" : "",
                required ? " required" : ""
            ).Append(childOptions).Append("</select></div>");

            return element.ToString();
        }

        private static string BuildRadioButtons(
            IEnumerable<string> options,
            string? selectedString,
            string style,
            string className,
            bool readOnly,
            bool required,
            string name
        )
        {
            var element = new StringBuilder(
                string.Format(@"<div name=""{0}"" class=""prs-web_utils-digital_form-radio_cont {1}"" style=""{2}position: relative;font-size: 1.2em;"">", name, className, style));

            var childOptions = new StringBuilder();

            var radioOptions = string.Format(
                @"name=""{0}"" type=""radio""{1}{2}",
                name,
                required ? " required" : "",
                readOnly ? " disabled" : ""
            );

            foreach (var option in options)
            {
                var selected = option == selectedString;
                var valueStr = $" value=\"{option}\"";
                var optionID = Guid.NewGuid();
                childOptions.Append($"<input id=\"{optionID}\"{valueStr} {radioOptions} {(selected ? " checked" : "")}/>"
                    + $"<label for=\"{optionID}\">{option}</label>");
            }

            element.Append(childOptions).Append("</div>");

            return element.ToString();
        }

        public static string BuildDigitalFormViewer(
            DFLayout layout,
            Dictionary<string, object>? data,
            bool readOnly,
            string? id = null, string[]? classList = null,
            string submitLabel = "Submit Form", string? saveLabel = "Save Form"
        )
        {
            StringBuilder stringBuilder = new();

            stringBuilder.Append("<form ");
            if (id != null) stringBuilder.Append("id=\"" + id + "\" ");
            stringBuilder.Append(@"class=""prs-web_utils-digital_form");
            if (classList != null)
                foreach (var className in classList)
                    stringBuilder.Append(" " + className);
            stringBuilder.Append(@""" style=""grid-template-columns:");
            foreach (var width in layout.ColumnWidths)
                if (width == "Auto")
                {
                    stringBuilder.Append("auto ");
                }
                else if (width == "*")
                {
                    stringBuilder.Append("1fr ");
                }
                else
                {
                    stringBuilder.Append(width);
                    stringBuilder.Append("px ");
                }

            stringBuilder.Append(@";grid-template-rows:");
            foreach (var height in layout.RowHeights)
                if (height == "Auto")
                {
                    stringBuilder.Append("auto ");
                }
                else if (height == "*")
                {
                    stringBuilder.Append("1fr ");
                }
                else
                {
                    stringBuilder.Append(height);
                    stringBuilder.Append("px ");
                }

            stringBuilder.Append(@"min-content;"">");
            var lastRowNum = layout.RowHeights.Count + 1;

            foreach (var element in layout.Elements)
            {
                var style = string.Format("grid-column: {0} / span {1};grid-row: {2} / span {3};", element.Column, element.ColumnSpan, element.Row,
                    element.RowSpan);

                if (element is DFLayoutField fieldElement)
                {
                    var required = fieldElement.GetPropertyValue<bool>("Required");
                    var fieldReadOnly = readOnly || fieldElement.GetPropertyValue<bool>("Secure");

                    object? fieldData = null;
                    data?.TryGetValue(fieldElement.Name, out fieldData);

                    var tagType = "input";
                    var classes = "";
                    string? value = null;
                    var properties = "";
                    string? children = null;

                    // TODO: DocumentField, MultiSignaturePad
                    if(element is DFLayoutAddTaskField addTaskField)
                    {
                        var kanbanType = addTaskField.Properties.TaskType;
                        var kanbanNumber = (int?)fieldData;

                        tagType = "div";
                        classes = "prs-web_utils-digital_form-add_task";
                        properties = $"data-tasktype=\"{kanbanType.ID}\"";

                        children = $"<input type=\"number\" step=\"1\" disabled{(kanbanNumber != null ? $" value=\"{kanbanNumber}\"" : "")}/>" +
                            $"<div class=\"prs-button\"{(fieldReadOnly || kanbanNumber != null ? " disabled" : "")}>Create Task</div>";
                    }
                    else if (element is DFLayoutBooleanField)
                    {
                        var fieldType = fieldElement.GetPropertyValue<DesignBooleanFieldType>("Type");
                        var trueValue = fieldElement.GetPropertyValue<string>("TrueValue");
                        var falseValue = fieldElement.GetPropertyValue<string>("FalseValue");

                        bool checkTrue = (bool?)fieldData == true;
                        bool checkFalse = (bool?)fieldData == false;

                        if (fieldType == DesignBooleanFieldType.Checkbox)
                        {
                            tagType = "div";
                            classes = "prs-web_utils-digital_form-boolean";

                            var options = string.Format(
                                @"name=""{0}"" type=""radio""{1}{2}",
                                fieldElement.Name,
                                required ? " required" : "",
                                fieldReadOnly ? " disabled" : ""
                            );

                            var disabled = fieldReadOnly ? " disabled" : "";

                            var idTrue = Guid.NewGuid();
                            var idFalse = Guid.NewGuid();

                            children =
                                $"<input value=\"{trueValue}\" id=\"{idTrue}\" {(checkTrue ? " checked" : "")} data-true {options}/>" +
                                    $"<label for=\"{idTrue}\">{trueValue}</label>" +
                                $"<input value=\"{falseValue}\" id=\"{idFalse}\" \"{(checkFalse ? " checked" : "")} data-false {options}/>" +
                                    $"<label for=\"{idFalse}\">{falseValue}</label>";
                        }
                        else if (fieldType == DesignBooleanFieldType.ComboBox)
                        {
                            classes = "prs-web_utils-digital_form-boolean";
                            tagType = "select";

                            children = string.Format(
                                @"<option{0} data-true>{1}</option><option{2} data-false>{3}</option>",
                                checkTrue ? " selected" : "",
                                trueValue,
                                checkFalse ? " selected" : "",
                                falseValue
                            );
                        }
                        else if (fieldType == DesignBooleanFieldType.Buttons)
                        {
                            classes = "prs-web_utils-digital_form-boolean";
                            tagType = "div";

                            var options = string.Format(
                                @"name=""{0}"" type=""radio""{1}{2}",
                                fieldElement.Name,
                                required ? " required" : "",
                                fieldReadOnly ? " disabled" : ""
                            );

                            children = string.Format(
                                @"<div class=""prs-web_utils-digital_form-button""><input {0} value=""{1}""{3} data-true></input><span>{1}</span></div>" +
                                @"<div class=""prs-web_utils-digital_form-button""><input {0} value=""{2}""{4} data-false></input><span>{2}</span></div>",
                                options,
                                trueValue,
                                falseValue,
                                checkTrue ? " checked" : "",
                                checkFalse ? " checked" : ""
                            );
                        }
                    }
                    else if (element is DFLayoutCodeField)
                    {
                        properties = @"type=""text"" pattern=""[^a-z]+""";
                        classes = "prs-web_utils-digital_form-code";
                        value = fieldData?.ToString() ?? "";
                    }
                    else if (element is DFLayoutColorField)
                    {
                        properties = @"type=""color""";
                        classes = "prs-web_utils-digital_form-color";

                        if (fieldData != null)
                            try
                            {
                                var color =
                                    (Color)ColorConverter.ConvertFromString((string)fieldData);
                                value = string.Format("#{0:x}{1:x}{2:x}", color.R, color.G, color.B);
                            }
                            catch (FormatException)
                            {
                            }
                    }
                    else if (element is DFLayoutDateField)
                    {
                        properties = @"type=""date""";
                        classes = "prs-web_utils-digital_form-date";
                        value = ((DateTime?)fieldData)?.ToString("yyyy-MM-dd") ?? "";
                    }
                    else if (element is DFLayoutDateTimeField)
                    {
                        properties = @"type=""datetime-local""";
                        classes = "prs-web_utils-digital_form-datetime";
                        value = fieldData != null ? string.Format("{0:yyyy-MM-dd}T{0:HH:mm}", fieldData) : "";
                    }
                    else if (element is DFLayoutDoubleField)
                    {
                        properties = @"type=""number""";
                        classes = "prs-web_utils-digital_form-double";
                        value = fieldData?.ToString() ?? "";
                    }
                    else if (element is DFLayoutIntegerField)
                    {
                        properties = @"type=""number"" step=""1""";
                        classes = "prs-web_utils-digital_form-integer";
                        value = fieldData?.ToString() ?? "";
                    }
                    else if (element is DFLayoutLookupField)
                    {
                        var type = CoreUtils.GetEntityOrNull((element as DFLayoutLookupField).Properties.LookupType);
                        if(type is not null)
                        {
                            var table = ClientFactory.CreateClient(type).Query(
                                LookupFactory.DefineFilter(type),
                                LookupFactory.DefineColumns(type),
                                LookupFactory.DefineSort(type)
                            );

                            data.TryGetValue(fieldElement.Name + "$ID", out var fieldID);
                            data.TryGetValue(fieldElement.Name, out var fieldFormat);

                            var options = table.Rows.Select(x => new Tuple<string, string?>(
                                LookupFactory.FormatLookup(type, x.ToDictionary(new[] { "ID" }), Array.Empty<string>()),
                                x["ID"].ToString())).ToList();
                            fieldFormat ??= options.Where(x => x.Item2 == fieldID?.ToString()).FirstOrDefault()?.Item1;

                            tagType = null;
                            stringBuilder.Append(BuildLookupField(
                                options,
                                fieldFormat?.ToString(),
                                style,
                                "prs-web_utils-digital_form-lookup prs-web_utils-digital_form-field",
                                fieldReadOnly,
                                required,
                                fieldElement.Name
                            ));
                        }
                    }
                    else if (element is DFLayoutMultiImage)
                    {
                        tagType = "div";
                        classes = "prs-web_utils-digital_form-multi_image";

                        var childBuild = new StringBuilder();
                        childBuild.Append(@"<div class=""prs-web_utils-digital_form-multi_image_cont""><div>");

                        if (fieldData is List<byte[]> images)
                            foreach (var image in images)
                            {
                                var imgStr = Convert.ToBase64String(image);
                                childBuild.AppendFormat(@"<img src=""data:;base64,{0}""/>", imgStr);
                            }

                        childBuild.AppendFormat(@"</div></div><div class=""prs-web_utils-digital_form-multi_image_btns"">" +
                                                @"<div class=""prs-button prs-web_utils-digital_form-multi_image_add""{0}>Add Image</div>" +
                                                @"<div class=""prs-button prs-web_utils-digital_form-multi_image_remove"" disabled>Remove Image</div>" +
                                                @"</div>",
                            fieldReadOnly ? " disabled" : ""
                        );

                        children = childBuild.ToString();
                    }
                    else if (element is DFLayoutNotesField)
                    {
                        tagType = "div";
                        classes = "prs-web_utils-digital_form-notes";

                        var notes = (string[]?)fieldData ?? Array.Empty<string>();

                        var childrenBuilder = new StringBuilder(@"<div class=""prs-web_utils-digital_form-note_cont"">");
                        foreach (var note in notes)
                            childrenBuilder.AppendFormat(@"<textarea class=""prs-web_utils-digital_form-note"" disabled>{0}</textarea>", note);

                        var options = fieldReadOnly ? "disabled" : "";
                        childrenBuilder.Append(
                            @"<textarea class=""prs-web_utils-digital_form-note active""></textarea><div class=""prs-web_utils-digital_form-note_error""></div></div>"
                            + $"<div class=\"prs-web_utils-digital_form-note_add prs-button\" {options}>+</div>");

                        children = childrenBuilder.ToString();
                    }
                    else if (element is DFLayoutOptionField optionField)
                    {
                        var optionType = optionField.Properties.OptionType;
                        tagType = null;

                        if (optionType == DFLayoutOptionType.Radio)
                        {
                            stringBuilder.Append(BuildRadioButtons(
                                optionField.Properties.Options.Split(','),
                                fieldData?.ToString(),
                                style,
                                "prs-web_utils-digital_form-field",
                                fieldReadOnly,
                                required,
                                fieldElement.Name
                            ));
                        }
                        else
                        {
                            stringBuilder.Append(BuildLookupField(
                                optionField.Properties.Options.Split(',').Select(x => new Tuple<string, string?>(x, null)),
                                fieldData?.ToString(),
                                style,
                                "prs-web_utils-digital_form-option prs-web_utils-digital_form-field",
                                fieldReadOnly,
                                required,
                                fieldElement.Name
                            ));
                        }
                    }
                    else if (element is DFLayoutPasswordField)
                    {
                        properties = @"type=""password""";
                        classes = "prs-web_utils-digital_form-password";
                        value = fieldData?.ToString() ?? "";
                    }
                    else if (element is DFLayoutPINField)
                    {
                        tagType = "div";
                        classes = "prs-web_utils-digital_form-pin";

                        var pinLength = fieldElement.GetPropertyValue<int>("Length");
                        properties += $" data-length=\"{pinLength}\"";

                        var options = fieldReadOnly ? "disabled" : "";

                        children +=
                            $"<input type=\"text\" disabled value=\"{fieldData?.ToString() ?? ""}\" class=\"prs-web_utils-digital_form-pin_text\"{(required ? " required" : "")}/>"
                            + $"<div class=\"prs-button prs-web_utils-digital_form-create_pin\" {options}>Create</div>"
                            + $"<div class=\"prs-button prs-web_utils-digital_form-clear_pin\" {options}>Clear</div>";
                    }
                    else if (element is DFLayoutStringField)
                    {
                        properties = @"type=""text""";
                        classes = "prs-web_utils-digital_form-string";
                        value = fieldData?.ToString() ?? "";
                    }
                    else if (element is DFLayoutTextField)
                    {
                        tagType = "textarea";
                        classes = "prs-web_utils-digital_form-text";
                        style += "resize:none;";
                        children += fieldData?.ToString();
                    }
                    else if (element is DFLayoutTimeField)
                    {
                        tagType = "div";
                        classes = "prs-web_utils-digital_form-time";

                        var timeSpan = (TimeSpan?)fieldData;
                        var hours = Math.Truncate(timeSpan?.TotalHours ?? 0.0);
                        var mins = timeSpan?.Minutes ?? 0.0;

                        var requiredStr = required ? " required" : "";

                        children = $"<input class=\"prs-web_utils-digital_form-time_hours\" type=\"number\" min=\"0\" step=\"1\" value=\"{hours}\"{requiredStr}/>" +
                            @"<span>:</span>"
                            + $"<input class=\"prs-web_utils-digital_form-time_mins\" type=\"number\" min=\"0\" step=\"1\" max=\"60\" value=\"{mins}\"{requiredStr}/>";
                    }
                    else if (element is DFLayoutTimeStampField)
                    {
                        tagType = "div";
                        classes = "prs-web_utils-digital_form-timestamp";

                        var exists = fieldData != null && (DateTime)fieldData != DateTime.MinValue;
                        var valueStr = exists ? string.Format("{0:yyyy-MM-dd}T{0:HH:mm}", fieldData) : "";
                        var btnStr = exists ? "Clear" : "Set";
                        var disabled = fieldReadOnly ? " disabled" : "";

                        children +=
                            $"<input type=\"datetime-local\" disabled value=\"{valueStr}\" class=\"prs-web_utils-digital_form-timestamp_date\"{(required ? " required" : "")}/>"
                            + $"<div class=\"prs-button prs-web_utils-digital_form-toggle_stamp\"{disabled}>{btnStr}</div>";
                    }
                    else if (element is DFLayoutURLField)
                    {
                        properties = @"type=""url""";
                        classes = "prs-web_utils-digital_form-url";
                        value = fieldData?.ToString();
                    }
                    else if (element is DFLayoutEmbeddedImage || element is DFLayoutSignaturePad)
                    {
                        // TODO: Perform validation for images
                        tagType = "div";
                        classes = element is DFLayoutEmbeddedImage
                            ? "prs-web_utils-digital_form-embedded_image"
                            : "prs-web_utils-digital_form-signature";

                        var content = "";
                        var hasContent = fieldData != null && ((byte[])fieldData).Length > 0;
                        if (hasContent)
                        {
                            content = string.Format(
                                @"<img class=""prs-web_utils-digital_form-img"" src=""data:;base64,{0}"">",
                                Convert.ToBase64String((byte[])fieldData)
                            );
                        }
                        else
                        {
                            if (fieldReadOnly)
                                content = "<span>No image</span>";
                            else
                                content = "<span>Choose a file</span>";
                        }

                        children = String.Format(@"<div class=""prs-button prs-web_utils-digital_form-img_cont""{1}>{0}<input type=""file"" accept=""image/*"" style=""display: none"" {1}></div><div class=""prs-button prs-web_utils-digital_form-clear_img""{2}>Clear Image</div>",
                            content,
                            fieldReadOnly ? " disabled" : "",
                            (hasContent && !fieldReadOnly) ? "" : " disabled"
                        );
                    }
                    
                    if (tagType != null)
                        stringBuilder.Append(string.Format(
                            @"<{0} style=""{1}"" class=""{2} prs-web_utils-digital_form-field""{3}{4}{5} name=""{6}"" {7}>{8}</{0}>",
                            tagType,
                            style,
                            classes,
                            required ? " required" : "",
                            fieldReadOnly ? " disabled" : "",
                            value != null ? " value=\"" + value + "\"" : "",
                            fieldElement.Name,
                            properties,
                            children ?? ""
                        ));
                }
                else if (element is DFLayoutLabel)
                {
                    stringBuilder.Append(string.Format(@"<label class=""prs-web_utils-digital_form-label"" style=""{0}"">{1}</label>", style,
                        (element as DFLayoutLabel).Caption));
                }
                else if (element is DFLayoutImage)
                {
                    stringBuilder.Append(string.Format(@"<img src=""/document?id={0}"" class=""prs-web_utils-digital_form-image"" style=""{1}"">",
                        (element as DFLayoutImage).Image.ID, style));
                }
            }

            if (!readOnly)
            {
                stringBuilder.Append($"<div class=\"prs-web_utils-digital_form-save_cont\" style=\"grid-column: 1 / -1; grid-row: {lastRowNum}\">");
                if (saveLabel != null) stringBuilder.Append($"<div class=\"prs-button prs-web_utils-digital_form-save\">{saveLabel}</div>");
                stringBuilder.Append($"<div class=\"prs-button prs-web_utils-digital_form-submit\">{submitLabel}</div>");
                stringBuilder.Append(@"</div>");
            }

            stringBuilder.Append("</form>");

            stringBuilder.Append(DigitalFormViewerScript);

            return stringBuilder.ToString();
        }

        /// <summary>
        ///     Builds a layout for viewing and optionally editing digital forms.
        /// </summary>
        /// <note>
        ///     <para>
        ///         In addition to outputting an HTML representation of the form, a script tag is outputted, which provides form
        ///         submission functionality and some extra layouting functionality.
        ///         The submit form button has the class of "prs-web_utils-digital_form-submit", and when clicked calls an event
        ///         named "prs-web_utils-df_submit" on the root form tag itself.
        ///         This event is a JavaScript CustomEvent object with detail.formData set to a JSON object containing data which
        ///         can be sent directly to www.domain.com/form_submission/XXXXForm?id=ID, allowing for the form to be submitted.
        ///     </para>
        /// </note>
        /// <param name="form">The instance of the form</param>
        /// <param name="entity">The entity associated with the form</param>
        /// <param name="readOnly">If set to true, causes all elements to be disabled and the Submit Form button to be omitted</param>
        /// <param name="id">An optional HTML id to add to root &lt;div&gt; of the generated item.</param>
        /// <param name="classList">An optional list of HTML classes to add to root &lt;div&gt; of the generated item.</param>
        /// <returns>A string containing raw HTML markup</returns>
        public static string BuildDigitalFormViewer(IBaseDigitalFormInstance form, Entity entity, bool readOnly, string? id = null,
            string[]? classList = null)
        {
            var formLayoutTable = new Client<DigitalFormLayout>().Query(
                new Filter<DigitalFormLayout>(x => x.Form.ID).IsEqualTo(form.Form.ID),
                new Columns<DigitalFormLayout>(x => x.Type).Add(x => x.Layout)
            );
            var variables = new Client<DigitalFormVariable>().Load(new Filter<DigitalFormVariable>(x => x.Form.ID).IsEqualTo(form.Form.ID));

            var digitalFormLayout =
                (formLayoutTable.Rows.FirstOrDefault(x => (DFLayoutType)x["Type"] == DFLayoutType.Mobile)
                 ?? formLayoutTable.Rows.FirstOrDefault(x => (DFLayoutType)x["Type"] == DFLayoutType.Desktop))?.ToObject<DigitalFormLayout>();

            var layout = digitalFormLayout != null
                ? DFLayout.FromLayoutString(digitalFormLayout.Layout)
                : DFLayout.GenerateAutoMobileLayout(variables);
            layout.LoadVariables(variables);

            var data = DigitalForm.ParseFormData(form.FormData, variables, entity);
            return BuildDigitalFormViewer(layout, data, readOnly, id, classList);
        }

        #endregion
    }

    public abstract class WebTemplateBase<T> : TemplateBase<T>
    {
        public IEncodedString JSON<U>() where U : Entity, new()
        {
            return new RawString(WebUtils.CreateJSONEntity<U>());
        }

        public IEncodedString JSON<U>(U entity) where U : Entity
        {
            return new RawString(WebUtils.EntityToJSON(entity));
        }

        public IEncodedString Get<U>(string entity, Expression<Func<U, object>> expression) where U : Entity
        {
            return new RawString(WebUtils.JSONGetProperty(entity, expression));
        }

        public IEncodedString Set<U>(string entity, Expression<Func<U, object>> expression, string value) where U : Entity
        {
            return new RawString(WebUtils.JSONSetProperty(entity, expression, value));
        }
    }
}