using FastReport.Utils;
using System;
using System.ComponentModel;
using System.IO;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace FastReport.Preview
{
    /// <summary>
    /// Represents a WPF control used to preview a report.
    /// </summary>
    /// <remarks>
    /// To use this control, place it on a form and link it to a report using the report's
    /// <see cref="FastReport.Report.WpfPreview"/> property. To show a report, call 
    /// the <b>Report.Show</b> method:
    /// <code>
    /// report1.WpfPreview = previewControl1;
    /// report1.Show();
    /// </code>
    /// <para>Use this control's methods such as <see cref="Print"/>, <see cref="Save()"/> etc. to
    /// handle the preview. Call <see cref="Clear"/> method to clear the preview.</para>
    /// <para>You can specify whether the standard toolbar is visible in the <see cref="ToolbarVisible"/>
    /// property. The <see cref="StatusbarVisible"/> property allows you to hide/show the statusbar.
    /// </para>
    /// </remarks>
    public partial class WpfPreviewControl : UserControl, INotifyPropertyChanged
    {
        /// <summary>
        /// Gets inner preview control.
        /// </summary>
        public PreviewControl InnerPreview { get; }

        /// <summary>
        /// Specifies the set of buttons available in the toolbar.
        /// </summary>
        public PreviewButtons Buttons
        {
            get => InnerPreview.Buttons;
            set => InnerPreview.Buttons = value;
        }

        /// <summary>
        /// Gets or sets a value indicating whether the toolbar is visible.
        /// </summary>
        public bool ToolbarVisible
        {
            get => InnerPreview.ToolbarVisible;
            set => InnerPreview.ToolbarVisible = value;
        }

        /// <summary>
        /// Gets or sets a value indicating whether the statusbar is visible.
        /// </summary>
        public bool StatusbarVisible
        {
            get => InnerPreview.StatusbarVisible;
            set => InnerPreview.StatusbarVisible = value;
        }

        /// <summary>
        /// Gets or sets the visual style.
        /// </summary>
        public UIStyle UIStyle
        {
            get => InnerPreview.UIStyle;
            set => InnerPreview.UIStyle = value;
        }

        /// <summary>
        /// Gets or sets a color used to draw the background area.
        /// </summary>
        /// <remarks>
        /// In order to use this property, you must also set the <see cref="UseBackColor"/> property to true.
        /// </remarks>
        public Color BackColor
        {
            get => System.Windows.Forms.Helper.GetColor(InnerPreview.BackColor);
            set => InnerPreview.BackColor = System.Windows.Forms.Helper.GetColor(value);
        }

        /// <summary>
        /// Gets or sets a value indicating that the BackColor property must be used to draw the background area.
        /// </summary>
        /// <remarks>
        /// By default, the background area is drawn using the color defined in the current <b>UIStyle</b>.
        /// </remarks>
        public bool UseBackColor
        {
            get => InnerPreview.UseBackColor;
            set => InnerPreview.UseBackColor = value;
        }

        /// <summary>
        /// Gets or sets the color of active page border.
        /// </summary>
        public Color ActivePageBorderColor
        {
            get => System.Windows.Forms.Helper.GetColor(InnerPreview.ActivePageBorderColor);
            set => InnerPreview.ActivePageBorderColor = System.Windows.Forms.Helper.GetColor(value);
        }

        /// <summary>
        /// Gets a reference to the report.
        /// </summary>
        public Report Report => InnerPreview.Report;

        /// <summary>
        /// Gets the value indicating that async report is running.
        /// </summary>
        /// <remarks>
        /// This value can be used to abort the report when you close the form that contains the report preview control.
        /// </remarks>
        public bool IsAsyncReportRunning => InnerPreview.IsAsyncReportRunning;

        /// <summary>
        /// Occurs when the current page is changed.
        /// </summary>
        public event EventHandler PageChanged
        {
            add => InnerPreview.PageChanged += value;
            remove => InnerPreview.PageChanged -= value;
        }

        #region ICommands
        public PreviewCommand cmdPrint { get; }

        public PreviewCommand cmdSave { get; }

        public PreviewCommand cmdLoad { get; }

        public PreviewCommand cmdSendEmail { get; }

        public PreviewCommand cmdFind { get; }

        public PreviewCommand cmdFindNext { get; }

        public PreviewCommand cmdFirst { get; }

        public PreviewCommand cmdPrior { get; }

        public PreviewCommand cmdNext { get; }

        public PreviewCommand cmdLast { get; }

        public PreviewCommand cmdZoomIn { get; }

        public PreviewCommand cmdZoomOut { get; }

        public PreviewCommand cmdZoomPageWidth { get; }

        public PreviewCommand cmdZoomWholePage { get; }

        public PreviewCommand cmdEditPage { get; }

        public PreviewCommand cmdEditWatermark { get; }

        public PreviewCommand cmdPageSetup { get; }

        public PreviewCommand cmdClear { get; }

        public event PropertyChangedEventHandler PropertyChanged;
        #endregion


        #region Preview commands
        /// <summary>
        /// Prints the current report.
        /// </summary>
        /// <returns><b>true</b> if report was printed; <b>false</b> if user cancels the "Print" dialog.</returns>
        public bool Print() => InnerPreview.Print();

        /// <summary>
        /// Saves the current report to a .fpx file using the "Save FIle" dialog.
        /// </summary>
        public void Save() => InnerPreview.Save();

        /// <summary>
        /// Saves the current report to a specified .fpx file.
        /// </summary>
        public void Save(string fileName) => InnerPreview.Save(fileName);

        /// <summary>
        /// Saves the current report to a stream.
        /// </summary>
        public void Save(Stream stream) => InnerPreview.Save(stream);

        /// <summary>
        /// Loads the report from a .fpx file using the "Open File" dialog.
        /// </summary>
        public void Load() => InnerPreview.Load();

        /// <summary>
        /// Loads the report from a specified .fpx file.
        /// </summary>
        public void Load(string fileName) => InnerPreview.Load(fileName);

        /// <summary>
        /// Load the report from a stream.
        /// </summary>
        /// <param name="stream">The stream to load from.</param>
        public void Load(Stream stream) => InnerPreview.Load(stream);

        /// <summary>
        /// Sends an email.
        /// </summary>
        public void SendEmail() => InnerPreview.SendEmail();

        /// <summary>
        /// Finds the text in the current report using the "Find Text" dialog.
        /// </summary>
        public void Find() => InnerPreview.Find();

        /// <summary>
        /// Finds the specified text in the current report.
        /// </summary>
        /// <param name="text">Text to find.</param>
        /// <param name="matchCase">A value indicating whether the search is case-sensitive.</param>
        /// <param name="wholeWord">A value indicating whether the search matches whole words only.</param>
        /// <returns><b>true</b> if text found.</returns>
        public bool Find(string text, bool matchCase, bool wholeWord) => InnerPreview.Find(text, matchCase, wholeWord);

        /// <summary>
        /// Finds the next occurence of text specified in the <b>Find</b> method.
        /// </summary>
        /// <returns><b>true</b> if text found.</returns>
        public bool FindNext() => InnerPreview.FindNext();

        /// <summary>
        /// Navigates to the first page.
        /// </summary>
        public void First() => InnerPreview.First();

        /// <summary>
        /// Navigates to the previuos page.
        /// </summary>
        public void Prior() => InnerPreview.Prior();

        /// <summary>
        /// Navigates to the next page.
        /// </summary>
        public void Next() => InnerPreview.Next();

        /// <summary>
        /// Navigates to the last page.
        /// </summary>
        public void Last() => InnerPreview.Last();

        /// <summary>
        /// Gets or sets the current page number.
        /// </summary>
        /// <remarks>
        /// This value is 1-based.
        /// </remarks>
        public int PageNo
        {
            get => InnerPreview.PageNo;
            set => InnerPreview.PageNo = value;
        }

        /// <summary>
        /// Gets the pages count in the current report.
        /// </summary>
        public int PageCount => InnerPreview.PageCount;

        /// <summary>
        /// Gets or sets the zoom factor.
        /// </summary>
        /// <remarks>
        /// <b>1</b> corresponds to 100% zoom.
        /// </remarks>
        public float Zoom
        {
            get => InnerPreview.Zoom;
            set => InnerPreview.Zoom = value;
        }

        /// <summary>
        /// Zooms in.
        /// </summary>
        public void ZoomIn() => InnerPreview.ZoomIn();

        /// <summary>
        /// Zooms out.
        /// </summary>
        public void ZoomOut() => InnerPreview.ZoomOut();

        /// <summary>
        /// Zooms to fit the page width.
        /// </summary>
        public void ZoomPageWidth() => InnerPreview.ZoomPageWidth();

        /// <summary>
        /// Zooms to fit the whole page.
        /// </summary>
        public void ZoomWholePage() => InnerPreview.ZoomWholePage();

        /// <summary>
        /// Edits the current page in the designer.
        /// </summary>
        public void EditPage() => InnerPreview.EditPage();

        /// <summary>
        /// Edits the watermark.
        /// </summary>
        public void EditWatermark() => InnerPreview.EditWatermark();

        /// <summary>
        /// Edits the page settings.
        /// </summary>
        public void PageSetup() => InnerPreview.PageSetup();

        /// <summary>
        /// Navigates to the specified position inside a specified page.
        /// </summary>
        /// <param name="pageNo">The page number (1-based).</param>
        /// <param name="point">The position inside a page, in pixels.</param>
        public void PositionTo(int pageNo, Point point) => InnerPreview.PositionTo(pageNo, new System.Drawing.PointF((float)point.X, (float)point.Y));

        /// <summary>
        /// Clears the preview.
        /// </summary>
        public void Clear() => InnerPreview.Clear();

        /// <summary>
        /// Refresh the report.
        /// </summary>
        public void RefreshReport() => InnerPreview.RefreshReport();

        /// <summary>
        /// Displays the text in the status bar.
        /// </summary>
        /// <param name="text">Text to display.</param>
        public void ShowStatus(string text) => InnerPreview.ShowStatus(text);

        #endregion

        private PreviewCommand CreateCmd(Action action) => new PreviewCommand(action);

        /// <summary>
        /// Initializes a new instance of the <see cref="WpfPreviewControl"/> class.
        /// </summary>
        public WpfPreviewControl()
        {
            InnerPreview = new PreviewControl();
            var control = InnerPreview.control;
            control.Width = double.NaN;
            control.Height = double.NaN;
            control.HorizontalAlignment = HorizontalAlignment.Stretch;
            control.VerticalAlignment = VerticalAlignment.Stretch;
            Content = control;
            UseLayoutRounding = true;

            Loaded += (s, e) =>
            {
                System.Windows.Forms.DpiRescaler.Install(Window.GetWindow(this), InnerPreview, this, (s, e) => InnerPreview.UpdateDpiDependencies());
            };

            InnerPreview.PageChanged += (s, e) =>
            {
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(PageNo)));
            };

            cmdPrint = CreateCmd(() => InnerPreview.Print());
            cmdSave = CreateCmd(InnerPreview.Save);
            cmdLoad = CreateCmd(InnerPreview.Load);
            cmdSendEmail = CreateCmd(InnerPreview.SendEmail);
            cmdFind = CreateCmd(InnerPreview.Find);
            cmdFindNext = CreateCmd(() => InnerPreview.FindNext());
            cmdFirst = CreateCmd(InnerPreview.First);
            cmdPrior = CreateCmd(InnerPreview.Prior);
            cmdNext = CreateCmd(InnerPreview.Next);
            cmdLast = CreateCmd(InnerPreview.Last);
            cmdZoomIn = CreateCmd(InnerPreview.ZoomIn);
            cmdZoomOut = CreateCmd(InnerPreview.ZoomOut);
            cmdZoomPageWidth = CreateCmd(InnerPreview.ZoomPageWidth);
            cmdZoomWholePage = CreateCmd(InnerPreview.ZoomWholePage);
            cmdEditPage = CreateCmd(InnerPreview.EditPage);
            cmdEditWatermark = CreateCmd(InnerPreview.EditWatermark);
            cmdPageSetup = CreateCmd(InnerPreview.PageSetup);
            cmdClear = CreateCmd(InnerPreview.Clear);
        }
    }
}