using FastReport.Code;
using FastReport.Data;
using FastReport.Design.ToolWindows;
using FastReport.Editor;
using FastReport.Editor.Common;
using FastReport.Editor.Syntax;
using FastReport.Forms;
using FastReport.Utils;
using System;
using System.Drawing;
using System.Reflection;
using System.Windows.Forms;

namespace FastReport.Design.PageDesigners.Code
{
    internal class CodePageDesigner : PageDesignerBase
    {
        #region Fields
        private SyntaxEdit edit;
        private TextSource source;
        private bool editInitialized;
        private string script;
        private bool canModify;
        Font defaultFont;
        #endregion

        #region Properties
        public SyntaxEdit Edit
        {
            get
            {
                if (!editInitialized)
                    CreateEdit();
                return edit;
            }
        }

        public TextSource Source
        {
            get
            {
                if (!editInitialized)
                    CreateEdit();
                return source;
            }
        }

        public string Script
        {
            get
            {
                return editInitialized ? Edit.Source.Text : script;
            }
            set
            {
                script = value;
                if (editInitialized)
                    SetScriptText();
            }
        }
        #endregion

        #region Private Methods
        private void CreateEdit()
        {
            editInitialized = true;
            source = new TextSource();
            edit = new SyntaxEdit();
            defaultFont = edit.Font;
            edit.Dock = DockStyle.Fill;
            edit.BorderStyle = EditBorderStyle.None;
            edit.Source = source;
            edit.AllowDrop = true;
            edit.DragOver += new DragEventHandler(Edit_DragOver);
            edit.DragDrop += new DragEventHandler(Edit_DragDrop);
            Controls.Add(edit);

            // do this after controls.add!
            edit.IndentOptions = IndentOptions.AutoIndent | IndentOptions.SmartIndent;
            edit.NavigateOptions = NavigateOptions.BeyondEol;
            edit.Braces.BracesOptions = BracesOptions.Highlight | BracesOptions.HighlightBounds;
            edit.Braces.BackColor = Color.LightGray;
            edit.Braces.Style = FontStyle.Regular;
            edit.Scroll.ScrollBars = RichTextBoxScrollBars.Both;
            edit.Scroll.Options = ScrollingOptions.AllowSplitHorz | ScrollingOptions.AllowSplitVert | ScrollingOptions.SmoothScroll;
            edit.Outlining.AllowOutlining = true;
            edit.DisplayLines.UseSpaces = true;
            edit.SplitHorz += new EventHandler(Edit_SplitHorz);
            edit.SplitVert += new EventHandler(Edit_SplitVert);
            edit.TextChanged += new EventHandler(Edit_TextChanged);
            edit.ImeMode = ImeMode.On;

            UpdateOptions();
            UpdateEditColors();
            UpdateFont();
            LocalizeEditMenu();
            SetScriptText();
        }

        private void SetScriptText()
        {
            canModify = false;
            Edit.Source.Text = script;
            Edit.Modified = false;
            canModify = true;
        }

        private void UpdateEditColors()
        {
            edit.Gutter.BrushColor = UIStyleUtils.GetControlColor(Designer.UIStyle);
            edit.Gutter.PenColor = edit.Gutter.BrushColor;
        }

        private void Edit_SplitHorz(object sender, EventArgs e)
        {
            Edit.HorzSplitEdit.BorderStyle = Edit.BorderStyle;
        }

        private void Edit_SplitVert(object sender, EventArgs e)
        {
            Edit.VertSplitEdit.BorderStyle = Edit.BorderStyle;
        }

        private void Edit_DragOver(object sender, DragEventArgs e)
        {
            DictionaryWindow.DraggedItem item = DictionaryWindow.DragUtils.GetOne(e);
            if (item != null)
            {
                Point pt = Edit.PointToClient(new Point(e.X, e.Y));
                HitTestInfo hit = new HitTestInfo();
                Edit.GetHitTest(pt, ref hit);
                if (hit.Pos != -1 && hit.Line != -1)
                    Edit.Position = new Point(hit.Pos, hit.Line);
                e.Effect = e.AllowedEffect;
            }
        }

        private void Edit_DragDrop(object sender, DragEventArgs e)
        {
            DictionaryWindow.DraggedItem item = DictionaryWindow.DragUtils.GetOne(e);
            if (item == null)
                return;

            CodeHelperBase codeHelper = Designer.ActiveReport.Report.CodeHelper;
            string text = "";
            if (item.obj is Column)
                text = codeHelper.ReplaceColumnName(item.text, (item.obj as Column).DataType);
            else if (item.obj is SystemVariable)
                text = codeHelper.ReplaceVariableName(item.obj as Parameter);
            else if (item.obj is Parameter)
                text = codeHelper.ReplaceParameterName(item.obj as Parameter);
            else if (item.obj is Total)
                text = codeHelper.ReplaceTotalName(item.text);
            else if (item.obj is MethodInfo)
                text = item.text;
            else
                text = "Report.Calc(\"" + item.text + "\")";

            Edit.Selection.InsertString(text);
            Edit.Focus();
        }

        private void Edit_TextChanged(object sender, EventArgs e)
        {
            if (canModify)
                Designer.SetModified(this, "no-undo");
        }

        public void CommitChanges()
        {
            if (Edit.Modified)
            {
                Edit.Modified = false;
                Designer.SetModified(this, "Script");
            }
        }

        private void LocalizeEditMenu()
        {
            MyRes res = new MyRes("Designer,Menu,Edit");
            StringConsts.MenuUndoCaption = res.Get("Undo");
            StringConsts.MenuRedoCaption = res.Get("Redo");
            StringConsts.MenuCutCaption = res.Get("Cut");
            StringConsts.MenuCopyCaption = res.Get("Copy");
            StringConsts.MenuPasteCaption = res.Get("Paste");
            StringConsts.MenuDeleteCaption = res.Get("Delete");
            StringConsts.MenuSelectAllCaption = res.Get("SelectAll");
        }
        #endregion

        #region Public Methods

        public void UpdateLanguage()
        {
            SyntaxParser parser = Designer.ActiveReport.Report.CodeHelper.Parser;
            Edit.Lexer = parser;
            Source.Lexer = parser;
            Source.FormatText();
            Designer.ActiveReport.Report.CodeHelper.RegisterAssemblies();
            Edit.Refresh();
        }

        public void UpdateOptions()
        {
            SyntaxConsts.DefaultHintDelay = CodePageSettings.EnableCodeCompletion ? 500 : int.MaxValue;
            SyntaxConsts.DefaultCompletionDelay = CodePageSettings.EnableCodeCompletion ? 100 : int.MaxValue;

            Edit.NavigateOptions = CodePageSettings.EnableVirtualSpace ? NavigateOptions.BeyondEol : NavigateOptions.None;
            Edit.DisplayLines.UseSpaces = CodePageSettings.UseSpaces;
            Edit.Outlining.AllowOutlining = CodePageSettings.AllowOutlining;
            Edit.DisplayLines.TabStops = new int[] { CodePageSettings.TabSize };
            edit.Gutter.Options = CodePageSettings.LineNumbers ? GutterOptions.PaintLineNumbers : GutterOptions.None;
        }

        public void UpdateFont()
        {
            Edit.Font = this.LogicalToDevice(Storage.GetFont("CodePageDesigner,CodePage", defaultFont));
        }

        public override bool CanCopy() => true;

        public override void Copy()
        {
            Edit.Selection.Copy();
        }

        public override void Cut()
        {
            Edit.Selection.Cut();
        }

        public override bool CanPaste() => true;

        public override void Paste()
        {
            Edit.Selection.Paste();
        }

        public override bool CanUndo()
        {
            return Source.CanUndo();
        }

        public override void Undo()
        {
            Source.Undo();
        }

        public override bool CanRedo()
        {
            return Source.CanRedo();
        }

        public override void Redo()
        {
            Source.Redo();
        }

        public override void SelectAll()
        {
            Edit.Selection.SelectAll();
        }

        public override void ResetModified()
        {
            if (editInitialized)
                Edit.Modified = false;
        }

        public override void FillObjects(bool resetSelection)
        {
            // do nothing
        }

        public override void PageActivated()
        {
            base.PageActivated();
            UpdateOptions();
            UpdateLanguage();
            if (!Edit.Focused)
                Edit.Focus();
        }

        public override void PageDeactivated()
        {
            base.PageDeactivated();
            if (editInitialized)
                CommitChanges();
        }
        #endregion

        #region IDesignerPlugin
        public override void SaveState()
        {
            CodePageSettings.SaveState();
        }

        public override void RestoreState()
        {
        }

        public override DesignerOptionsPage GetOptionsPage()
        {
            return new CodePageOptions(this);
        }

        public override void UpdateUIStyle()
        {
            base.UpdateUIStyle();
            if (editInitialized)
                UpdateEditColors();
        }

        public override void Localize()
        {
            base.Localize();
            if (editInitialized)
                LocalizeEditMenu();
        }

        public override void UpdateDpiDependencies()
        {
            base.UpdateDpiDependencies();
            if (editInitialized)
                UpdateFont();
        }
        #endregion

        public CodePageDesigner(Designer designer) : base(designer)
        {
            Name = "Code";
            RightToLeft = Config.RightToLeft ? RightToLeft.Yes : RightToLeft.No;
        }
    }

}