using FastReport.Design.PageDesigners.Dialog;
using FastReport.Design.Toolbars;
using FastReport.Utils;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Windows.Forms;

namespace FastReport.Design.StandardDesigner
{
    /// <summary>
    /// Represents the standard report designer.
    /// </summary>
    /// <remarks>
    /// This control extends the <see cref="FastReport.Design.Designer"/> control with 
    /// standard menu, status bar, and toolbars.
    /// <para/>To choose toolbars and tool windows in design-time, click the "View" menu
    /// in this control and select what you want to see. Toolbars can be reordered using the mouse.
    /// <para/>To restore the designer layout at runtime, you need to call the 
    /// <see cref="FastReport.Design.Designer.RefreshLayout">RefreshLayout</see> method in your
    /// form's <b>Load</b> event handler. 
    /// </remarks>
    [ToolboxItem(true), ToolboxBitmap(typeof(Report), "Resources.DesignerControl.bmp")]
    public partial class DesignerControl : Designer
    {
        #region Fields
        private DesignerMenu mainMenu;
        private DesignerStatusBar statusBar;
        private Panel toolStripPanel;
        private StandardToolbar standardToolbar;
        private TextToolbar textToolbar;
        private BorderToolbar borderToolbar;
        private LayoutToolbar layoutToolbar;
        private StyleToolbar styleToolbar;
        private PolygonToolbar polygonToolbar;
        private ContextMenuStrip mnuContext;

        private bool showMainMenu;
        private bool showStatusBar;
        #endregion

        #region Properties
        /// <summary>
        /// Gets the main menu.
        /// </summary>
        [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public DesignerMenu MainMenu
        {
            get { return mainMenu; }
        }

        /// <summary>
        /// Gets or sets a value indicating whether the main menu should be displayed or not.
        /// </summary>
        [SRCategory("Toolbars")]
        [DefaultValue(true)]
        public bool ShowMainMenu
        {
            get { return showMainMenu; }
            set
            {
                showMainMenu = value;
                mainMenu.Visible = value;
            }
        }

        /// <summary>
        /// Gets or sets a value indicating whether the status bar should be displayed or not.
        /// </summary>
        [SRCategory("Toolbars")]
        [DefaultValue(true)]
        public bool ShowStatusBar
        {
            get { return showStatusBar; }
            set
            {
                showStatusBar = value;
                statusBar.Visible = value;
            }
        }
        #endregion

        #region Private Methods
        private void CreateToolbarMenu()
        {
            mnuContext = new ContextMenuStrip();
            toolStripPanel.ContextMenuStrip = mnuContext;
            mnuContext.Opening += mnuContext_Opening;

            foreach (IDesignerPlugin plugin in Plugins)
            {
                if (plugin is DesignerToolbarBase)
                {
                    var menuItem = new ToolStripMenuItem();
                    menuItem.Text = (plugin as DesignerToolbarBase).Text;
                    menuItem.Tag = plugin;
                    menuItem.Click += toolbar_Click;
                    mnuContext.Items.Add(menuItem);
                }
            }
        }

        private void mnuContext_Opening(object sender, EventArgs e)
        {
            mnuContext.Renderer = UIStyleUtils.GetToolStripRenderer(UIStyle);
            foreach (ToolStripItem item in mnuContext.Items)
            {
                var menuItem = item as ToolStripMenuItem;
                var toolbar = item.Tag as DesignerToolbarBase;
                menuItem.Text = toolbar.Text;
                menuItem.Checked = toolbar.Visible;
            }
        }

        private void toolbar_Click(object sender, EventArgs e)
        {
            var toolbar = (sender as ToolStripItem).Tag as DesignerToolbarBase;
            toolbar.Visible = !toolbar.Visible;
            LayoutToolbars();
        }

        private int LayoutToolbar(DesignerToolbarBase toolbar, int left, int top)
        {
            bool rtl = RightToLeft == RightToLeft.Yes;
            toolbar.Location = new Point(rtl ? Width - left - toolbar.Width : left, top);
            return left + toolbar.Width;
        }

        internal void LayoutToolbars()
        {
            var rowHeight = standardToolbar.Height;
            if (rowHeight == 0)
                return;

            // get list of visible toolbars
            var toolbars = toolStripPanel.Controls.OfType<DesignerToolbarBase>().Where(tb => tb.Visible).ToList();

            List<List<DesignerToolbarBase>> rows = new List<List<DesignerToolbarBase>>();
            int maxRows = Height / rowHeight;

            // find toolbars on each row
            for (int i = -1; i < maxRows; i++)
            {
                var row = new List<DesignerToolbarBase>();
                rows.Add(row);
                int rowTop = i * rowHeight - rowHeight / 2;
                int rowBottom = rowTop + rowHeight;
                if (i == -1)
                {
                    // handle special case when toolbar is dragged out of parent bounds (above the first row)
                    rowTop = -1000;
                }

                // find toolbars on this row
                for (int j = 0; j < toolbars.Count; j++)
                {
                    var tb = toolbars[j];
                    if (tb.Top >= rowTop && tb.Top <= rowBottom)
                    {
                        row.Add(tb);
                        // remove from toolbars list to avoid having one toolbar on multiple rows (due to math errors)
                        toolbars.RemoveAt(j);
                        j--;
                    }
                }

                if (toolbars.Count == 0)
                    break;
            }

            // sort each row by Left (Right in opposite order in case of rtl)
            bool rtl = RightToLeft == RightToLeft.Yes;
            rows.ForEach(row => row.Sort((x, y) => rtl ? y.Right.CompareTo(x.Right) : x.Left.CompareTo(y.Left)));

            // remove empty rows
            rows.RemoveAll(row => row.Count == 0);

            // layout toolbars
            for (int i = 0; i < rows.Count; i++)
            {
                int x = 0;
                int y = i * rowHeight;
                rows[i].ForEach(tb => x = LayoutToolbar(tb, x, y));
            }
            
            // set overall height
            toolStripPanel.Height = rows.Count * rowHeight;
        }

        private void toolStripPanel_Paint(object sender, PaintEventArgs e)
        {
            var ct = UIStyleUtils.GetColorTable(UIStyle);
            Rectangle rect = new Rectangle(0, 0, toolStripPanel.Width, toolStripPanel.Height);
            using (var brush = new LinearGradientBrush(rect, ct.ToolStripPanelGradientBegin, ct.ToolStripPanelGradientEnd, LinearGradientMode.Horizontal))
                e.Graphics.FillRectangle(brush, rect);
            int _1 = this.LogicalToDevice(1);
            using (var brush = new SolidBrush(ct.ToolStripBorder))
                e.Graphics.FillRectangle(brush, 0, rect.Height - _1, rect.Width, _1);
        }
        #endregion

        #region Protected Methods
        internal override void AfterRestoreState()
        {
            base.AfterRestoreState();
#if AVALONIA
            // this should be deferred to get correct toolbars size
            this.control.Loaded += (s,e) =>
#endif
            LayoutToolbars();
        }

        /// <inheritdoc/>
        protected override void OnResize(EventArgs e)
        {
            base.OnResize(e);
            if (RightToLeft == RightToLeft.Yes)
                LayoutToolbars();
        }

        /// <inheritdoc/>
        protected override void InitPlugins()
        {
            base.InitPlugins();

            toolStripPanel = new Panel();
            toolStripPanel.Dock = DockStyle.Top;
            toolStripPanel.Paint += toolStripPanel_Paint;
            Controls.Add(toolStripPanel);

            mainMenu = new DesignerMenu(this);
            statusBar = new DesignerStatusBar(this);

            // create toolbars and make default toolbar layout
            standardToolbar = new StandardToolbar(this) { Left = 0, Top = 0 };
            layoutToolbar = new LayoutToolbar(this) { Left = standardToolbar.Right, Top = 0 };
            textToolbar = new TextToolbar(this) { Left = 0, Top = standardToolbar.Bottom };
            borderToolbar = new BorderToolbar(this) { Left = textToolbar.Right, Top = textToolbar.Top };
            styleToolbar = new StyleToolbar(this) { Left = borderToolbar.Right, Top = textToolbar.Top };
            polygonToolbar = new PolygonToolbar(this) { Left = styleToolbar.Right, Top = textToolbar.Top };

            var toolbars = new Control[] { standardToolbar, layoutToolbar, textToolbar, borderToolbar, styleToolbar, polygonToolbar };
            foreach (var toolbar in toolbars)
            {
                // WPF/Avalonia: occurs when toolbar is dragged to a new position. Not used in Mono
                toolbar.DragDrop += (s, e) => LayoutToolbars();
            }

            toolStripPanel.Controls.AddRange(toolbars);

            Plugins.AddRange(new IDesignerPlugin[] {
                mainMenu, statusBar, standardToolbar, textToolbar, borderToolbar,
                layoutToolbar, styleToolbar, polygonToolbar });

            CreateToolbarMenu();
        }
#endregion

        #region Public Methods
        /// <inheritdoc/>
        public override void ShowStatus(string location, string size, string text, string locationRightBot)
        {
            statusBar.UpdateLocationAndSize(location, size, locationRightBot);
            statusBar.UpdateText(text);
        }

        /// <inheritdoc/>
        public override void UpdateUIStyle()
        {
            base.UpdateUIStyle();
            toolStripPanel.Refresh();
        }

        /// <inheritdoc/>
        public override void UpdateDpiDependencies(object sender)
        {
            base.UpdateDpiDependencies(sender);
            mnuContext.Font = this.Font;
            LayoutToolbars();
        }

        internal void UpdateFirstDialogPage()
        {
            // WPF bug: designer workspace is not initialized if the dialog form is the first page in a report (reason: visible designer form is needed)
            if (ActiveReportTab != null && ActiveReportTab.ActivePageDesigner is DialogPageDesigner pd)
                pd.UpdateDpiDependencies();
        }
        #endregion

        /// <summary>
        /// Initializes a new instance of the <see cref="DesignerControl"/> class with default settings.
        /// </summary>
        public DesignerControl()
        {
            ShowMainMenu = true;
            ShowStatusBar = true;
        }
    }
}