#region License

// Copyright 2005-2019 Paul Kohler (https://github.com/paulkohler/minisqlquery). All rights reserved.
// This source code is made available under the terms of the GNU Lesser General Public License v3.0
// https://github.com/paulkohler/minisqlquery/blob/master/LICENSE

#endregion

using System;
using System.Diagnostics;
using System.Drawing;
using System.Windows.Forms;

namespace MiniSqlQuery.Core
{
    /// <summary>
    /// 	Helper class for building controls out of <see cref = "ICommand" /> objects.
    /// </summary>
    public class CommandControlBuilder
    {
        /// <summary>
        /// 	Handles the click event of a tool strip item, if the <see cref = "ToolStripItem.Tag" /> is 
        /// 	an <see cref = "ICommand" /> instance the action is executed.
        /// </summary>
        /// <param name = "sender">The sender.</param>
        /// <param name = "e">The <see cref = "System.EventArgs" /> instance containing the event data.</param>
        [DebuggerNonUserCode]
        public static void CommandItemClick(object sender, EventArgs e)
        {
            var item = sender as ToolStripItem;

            if (item != null)
            {
                var cmd = item.Tag as ICommand;

                if (cmd != null)
                {
                    cmd.Execute();
                }
            }
        }

        /// <summary>
        /// 	Creates a link label given the <typeparamref name = "TCommand" /> definition.
        /// </summary>
        /// <typeparam name = "TCommand">The type of the command.</typeparam>
        /// <returns>A link label wired to the commands <see cref = "ICommand.Execute" /> method.</returns>
        public static LinkLabel CreateLinkLabel<TCommand>() where TCommand : ICommand, new()
        {
            var linkLabel = new LinkLabel();
            var cmd = CommandManager.GetCommandInstance<TCommand>();

            linkLabel.AutoSize = true;
            linkLabel.Name = cmd.GetType().Name + "LinkLabel";
            linkLabel.TabStop = true;
            linkLabel.Text = cmd.Name.Replace("&", string.Empty);
            linkLabel.Tag = cmd;
            linkLabel.Padding = new Padding(4);
            linkLabel.LinkClicked += LinkLabelLinkClicked;

            return linkLabel;
        }

        /// <summary>
        /// 	Creates a tool strip button given the <typeparamref name = "TCommand" /> definition.
        /// </summary>
        /// <typeparam name = "TCommand">The type of the command.</typeparam>
        /// <returns>A tool strip button</returns>
        public static ToolStripButton CreateToolStripButton<TCommand>() where TCommand : ICommand, new()
        {
            var button = new ToolStripButton();
            var cmd = CommandManager.GetCommandInstance<TCommand>();

            button.DisplayStyle = ToolStripItemDisplayStyle.Image;
            button.Image = cmd.SmallImage;
            button.ImageTransparentColor = Color.Magenta;
            button.Name = cmd.GetType().Name + "ToolStripButton";
            button.Tag = cmd;
            button.Text = cmd.Name;
            button.Click += CommandItemClick;

            return button;
        }

        /// <summary>
        /// 	Creates a tool strip menu item given the <typeparamref name = "TCommand" /> definition.
        /// </summary>
        /// <typeparam name = "TCommand">The type of the command.</typeparam>
        /// <returns>A tool strip menu item wired to the commands <see cref = "ICommand.Execute" /> method.</returns>
        public static ToolStripMenuItem CreateToolStripMenuItem<TCommand>() where TCommand : ICommand, new()
        {
            var menuItem = new ToolStripMenuItem();
            var cmd = CommandManager.GetCommandInstance<TCommand>();

            menuItem.Name = cmd.GetType().Name + "ToolStripMenuItem";
            menuItem.Text = cmd.Name;
            menuItem.Tag = cmd;
            menuItem.ShortcutKeys = cmd.ShortcutKeys;
            menuItem.Image = cmd.SmallImage;
            menuItem.Click += CommandItemClick;

            // store the host for callback
            cmd.Host = menuItem;

            // todo...
            // if (!string.IsNullOrEmpty(cmd.ShortcutKeysText))
            // {
            // menuItem.ToolTipText = string.Format("{0} ({1})", cmd.Name, cmd.ShortcutKeysText);
            // }

            return menuItem;
        }

        /// <summary>
        /// 	Creates a tool strip menu item seperator.
        /// </summary>
        /// <returns>A tool strip seperator.</returns>
        public static ToolStripSeparator CreateToolStripMenuItemSeparator()
        {
            return new ToolStripSeparator();
        }

        /// <summary>
        /// 	Assigns an event handler (<see cref = "TopLevelMenuDropDownOpening" />) to the opening event
        /// 	for menu strip items which in turn hadles enableing and disabling.
        /// </summary>
        /// <param name = "menuStrip">The menu strip to monitor.</param>
        public static void MonitorMenuItemsOpeningForEnabling(ToolStrip menuStrip)
        {
            if (menuStrip is ContextMenuStrip || menuStrip is MenuStrip)
            {
                foreach (ToolStripItem item in menuStrip.Items)
                {
                    var topLevelMenu = item as ToolStripMenuItem;
                    if (topLevelMenu != null)
                    {
                        // Debug.WriteLine("MonitorMenuItemsOpeningForEnabling :: " + topLevelMenu.Text);
                        topLevelMenu.DropDownOpening += TopLevelMenuDropDownOpening;
                        topLevelMenu.DropDownClosed += TopLevelMenuDropDownClosed;
                    }
                }
            }
        }

        /// <summary>
        /// 	Used when a menu is opening, handles enabling/disabling of items for display.
        /// </summary>
        /// <param name = "sender">The sender.</param>
        /// <param name = "e">The <see cref = "System.EventArgs" /> instance containing the event data.</param>
        [DebuggerNonUserCode]
        public static void TopLevelMenuDropDownOpening(object sender, EventArgs e)
        {
            var menuItem = sender as ToolStripMenuItem;

            if (menuItem != null)
            {
                foreach (ToolStripItem item in menuItem.DropDownItems)
                {
                    var cmd = item.Tag as ICommand;

                    if (cmd != null)
                    {
                        item.Enabled = cmd.Enabled;
                    }
                }
            }
        }

        /// <summary>
        /// 	The link label link clicked.
        /// </summary>
        /// <param name = "sender">The sender.</param>
        /// <param name = "e">The <see cref = "System.Windows.Forms.LinkLabelLinkClickedEventArgs" /> instance containing the event data.</param>
        private static void LinkLabelLinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            var linkLabel = sender as Control;

            if (linkLabel != null)
            {
                var cmd = linkLabel.Tag as ICommand;

                if (cmd != null)
                {
                    cmd.Execute();
                }
            }
        }

        /// <summary>
        /// 	We need to re-enable all the menu items so that the shortcut keys are available.
        /// 	This is because the model uses a continuous check approach rather than individual events
        /// 	for the enabling.
        /// </summary>
        /// <param name = "sender">The sender.</param>
        /// <param name = "e">The <see cref = "System.EventArgs" /> instance containing the event data.</param>
        [DebuggerNonUserCode]
        private static void TopLevelMenuDropDownClosed(object sender, EventArgs e)
        {
            var menuItem = sender as ToolStripMenuItem;

            if (menuItem != null)
            {
                foreach (ToolStripItem item in menuItem.DropDownItems)
                {
                    var cmd = item.Tag as ICommand;

                    if (cmd != null)
                    {
                        item.Enabled = true;
                    }
                }
            }
        }
    }
}