/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2013  Thomas Braun, Jens Klingen, Robin Krom
 *
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

using System.ComponentModel;
using System.Threading;
using Greenshot.Drawing.Fields;
using Greenshot.IniFile;
using Greenshot.Memento;
using Greenshot.Plugin;
using Greenshot.Plugin.Drawing;
using GreenshotPlugin.Core;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

namespace Greenshot.Drawing
{
    /// <summary>
    /// Dispatches most of a DrawableContainer's public properties and methods to a list of DrawableContainers.
    /// </summary>
    [Serializable()]
    public class DrawableContainerList : List<IDrawableContainer>
    {
        private static CoreConfiguration conf = IniConfig.GetIniSection<CoreConfiguration>();
        private static ComponentResourceManager editorFormResources = new ComponentResourceManager(typeof(ImageEditorForm));

        public DrawableContainerList()
        {
        }

        public EditStatus Status
        {
            get
            {
                return this[Count - 1].Status;
            }
            set
            {
                foreach (DrawableContainer dc in this)
                {
                    dc.Status = value;
                }
            }
        }

        public List<IDrawableContainer> AsIDrawableContainerList()
        {
            List<IDrawableContainer> interfaceList = new List<IDrawableContainer>();
            foreach (IDrawableContainer container in this)
            {
                interfaceList.Add(container);
            }
            return interfaceList;
        }

        /// <summary>
        /// Gets or sets the selection status of the elements.
        /// If several elements are in the list, true is only returned when all elements are selected.
        /// </summary>
        public bool Selected
        {
            get
            {
                bool ret = true;
                foreach (DrawableContainer dc in this)
                {
                    ret &= dc.Selected;
                }
                return ret;
            }
            set
            {
                foreach (DrawableContainer dc in this)
                {
                    dc.Selected = value;
                }
            }
        }

        /// <summary>
        /// Gets or sets the parent control of the elements in the list.
        /// If there are several elements, the parent control of the last added is returned.
        /// </summary>
        public ISurface Parent
        {
            get
            {
                if (Count > 0)
                {
                    return this[Count - 1].Parent;
                }
                return null;
            }
            set
            {
                foreach (DrawableContainer dc in this)
                {
                    dc.Parent = value;
                }
            }
        }

        /// <summary>
        /// Make a following bounds change on this containerlist undoable!
        /// </summary>
        /// <param name="allowMerge">true means allow the moves to be merged</param>
        public void MakeBoundsChangeUndoable(bool allowMerge)
        {
            List<IDrawableContainer> movingList = new List<IDrawableContainer>();
            Surface surface = null;
            foreach (DrawableContainer dc in this)
            {
                movingList.Add(dc);
                surface = dc.parent;
            }
            if (movingList.Count > 0 && surface != null)
            {
                surface.MakeUndoable(new DrawableContainerBoundsChangeMemento(movingList), allowMerge);
            }
        }

        /// <summary>
        /// Moves all elements in the list by the given amount of pixels.
        /// </summary>
        /// <param name="dx">pixels to move horizontally</param>
        /// <param name="dy">pixels to move vertically</param>
        public void MoveBy(int dx, int dy)
        {
            // Track modifications
            bool modified = false;

            // Invalidate before moving, otherwise the old locations aren't refreshed
            Invalidate();
            foreach (DrawableContainer dc in this)
            {
                dc.Left += dx;
                dc.Top += dy;
                modified = true;
            }
            // Invalidate after
            Invalidate();

            // If we moved something, tell the surface it's modified!
            if (modified)
            {
                Parent.Modified = true;
            }
        }

        /// <summary>
        /// Hides the grippers of all elements in the list.
        /// </summary>
        public void HideGrippers()
        {
            foreach (DrawableContainer dc in this)
            {
                dc.HideGrippers();
                dc.Invalidate();
            }
        }

        /// <summary>
        /// Shows the grippers of all elements in the list.
        /// </summary>
        public void ShowGrippers()
        {
            foreach (DrawableContainer dc in this)
            {
                dc.ShowGrippers();
                dc.Invalidate();
            }
        }

        /// <summary>
        /// Indicates whether on of the elements is clickable at the given location
        /// </summary>
        /// <param name="x">x coordinate to be checked</param>
        /// <param name="y">y coordinate to be checked</param>
        /// <returns>true if one of the elements in the list is clickable at the given location, false otherwise</returns>
        public bool ClickableAt(int x, int y)
        {
            bool ret = false;
            foreach (DrawableContainer dc in this)
            {
                ret |= dc.ClickableAt(x, y);
            }
            return ret;
        }

        /// <summary>
        /// retrieves the topmost element being clickable at the given location
        /// </summary>
        /// <param name="x">x coordinate to be checked</param>
        /// <param name="y">y coordinate to be checked</param>
        /// <returns>the topmost element from the list being clickable at the given location, null if there is no clickable element</returns>
        public IDrawableContainer ClickableElementAt(int x, int y)
        {
            for (int i = Count - 1; i >= 0; i--)
            {
                if (this[i].ClickableAt(x, y))
                {
                    return this[i];
                }
            }
            return null;
        }

        /// <summary>
        /// Dispatches OnDoubleClick to all elements in the list.
        /// </summary>
        public void OnDoubleClick()
        {
            foreach (DrawableContainer dc in this)
            {
                dc.OnDoubleClick();
            }
        }

        /// <summary>
        /// Check if there are any intersecting filters, if so we need to redraw more
        /// </summary>
        /// <param name="clipRectangle"></param>
        /// <returns>true if an filter intersects</returns>
        public bool hasIntersectingFilters(Rectangle clipRectangle)
        {
            foreach (DrawableContainer dc in this)
            {
                if (dc.DrawingBounds.IntersectsWith(clipRectangle) && dc.hasFilters && dc.Status == EditStatus.IDLE)
                {
                    return true;
                }
            }
            return false;
        }

        /// <summary>
        /// Check if any of the drawableContainers are inside the rectangle
        /// </summary>
        /// <param name="clipRectangle"></param>
        /// <returns></returns>
        public bool IntersectsWith(Rectangle clipRectangle)
        {
            foreach (DrawableContainer dc in this)
            {
                if (dc.DrawingBounds.IntersectsWith(clipRectangle))
                {
                    return true;
                }
            }
            return false;
        }

        /// <summary>
        /// Triggers all elements in the list ot be redrawn.
        /// </summary>
        /// <param name="g">the related Graphics object</param>
        /// <param name="renderMode">the rendermode in which the element is to be drawn</param>
        public void Draw(Graphics g, Bitmap bitmap, RenderMode renderMode, Rectangle clipRectangle)
        {
            foreach (DrawableContainer dc in this)
            {
                if (dc.DrawingBounds.IntersectsWith(clipRectangle))
                {
                    dc.DrawContent(g, bitmap, renderMode, clipRectangle);
                }
            }
        }

        /// <summary>
        /// Pass the field changed event to all elements in the list
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void HandleFieldChangedEvent(object sender, FieldChangedEventArgs e)
        {
            foreach (DrawableContainer dc in this)
            {
                dc.HandleFieldChanged(sender, e);
            }
        }

        /// <summary>
        /// Invalidate the bounds of all the DC's in this list
        /// </summary>
        public void Invalidate()
        {
            foreach (DrawableContainer dc in this)
            {
                dc.Invalidate();
            }
        }

        /// <summary>
        /// Indicates whether the given list of elements can be pulled up,
        /// i.e. whether there is at least one unselected element higher in hierarchy
        /// </summary>
        /// <param name="elements">list of elements to pull up</param>
        /// <returns>true if the elements could be pulled up</returns>
        public bool CanPullUp(DrawableContainerList elements)
        {
            if (elements.Count == 0 || elements.Count == Count)
            {
                return false;
            }
            foreach (DrawableContainer element in elements)
            {
                if (IndexOf(element) < Count - elements.Count)
                {
                    return true;
                }
            }
            return false;
        }

        /// <summary>
        /// Pulls one or several elements up one level in hierarchy (z-index).
        /// </summary>
        /// <param name="elements">list of elements to pull up</param>
        public void PullElementsUp(DrawableContainerList elements)
        {
            for (int i = Count - 1; i >= 0; i--)
            {
                IDrawableContainer dc = this[i];
                if (elements.Contains(dc))
                {
                    if (Count > (i + 1) && !elements.Contains(this[i + 1]))
                    {
                        SwapElements(i, i + 1);
                    }
                }
            }
        }

        /// <summary>
        /// Pulls one or several elements up to the topmost level(s) in hierarchy (z-index).
        /// </summary>
        /// <param name="elements">of elements to pull to top</param>
        public void PullElementsToTop(DrawableContainerList elements)
        {
            IDrawableContainer[] dcs = ToArray();
            for (int i = 0; i < dcs.Length; i++)
            {
                IDrawableContainer dc = dcs[i];
                if (elements.Contains(dc))
                {
                    Remove(dc);
                    Add(dc);
                    Parent.Modified = true;
                }
            }
        }

        /// <summary>
        /// Indicates whether the given list of elements can be pushed down,
        /// i.e. whether there is at least one unselected element lower in hierarchy
        /// </summary>
        /// <param name="elements">list of elements to push down</param>
        /// <returns>true if the elements could be pushed down</returns>
        public bool CanPushDown(DrawableContainerList elements)
        {
            if (elements.Count == 0 || elements.Count == Count)
            {
                return false;
            }
            foreach (DrawableContainer element in elements)
            {
                if (IndexOf(element) >= elements.Count)
                {
                    return true;
                }
            }
            return false;
        }

        /// <summary>
        /// Pushes one or several elements down one level in hierarchy (z-index).
        /// </summary>
        /// <param name="elements">list of elements to push down</param>
        public void PushElementsDown(DrawableContainerList elements)
        {
            for (int i = 0; i < Count; i++)
            {
                IDrawableContainer dc = this[i];
                if (elements.Contains(dc))
                {
                    if ((i > 0) && !elements.Contains(this[i - 1]))
                    {
                        SwapElements(i, i - 1);
                    }
                }
            }
        }

        /// <summary>
        /// Pushes one or several elements down to the bottommost level(s) in hierarchy (z-index).
        /// </summary>
        /// <param name="elements">of elements to push to bottom</param>
        public void PushElementsToBottom(DrawableContainerList elements)
        {
            IDrawableContainer[] dcs = ToArray();
            for (int i = dcs.Length - 1; i >= 0; i--)
            {
                IDrawableContainer dc = dcs[i];
                if (elements.Contains(dc))
                {
                    Remove(dc);
                    Insert(0, dc);
                    Parent.Modified = true;
                }
            }
        }

        /// <summary>
        /// swaps two elements in hierarchy (z-index),
        /// checks both indices to be in range
        /// </summary>
        /// <param name="index1">index of the 1st element</param>
        /// <param name="index2">index of the 2nd element</param>
        private void SwapElements(int index1, int index2)
        {
            if (index1 >= 0 && index1 < Count && index2 >= 0 && index2 < Count && index1 != index2)
            {
                IDrawableContainer dc = this[index1];
                this[index1] = this[index2];
                this[index2] = dc;
                Parent.Modified = true;
            }
        }

        /// <summary>
        /// Add items to a context menu for the selected item
        /// </summary>
        /// <param name="menu"></param>
        public virtual void AddContextMenuItems(ContextMenuStrip menu, Surface surface)
        {
            bool push = surface.Elements.CanPushDown(this);
            bool pull = surface.Elements.CanPullUp(this);

            ToolStripMenuItem item;

            // Pull "up"
            if (pull)
            {
                item = new ToolStripMenuItem("Up to top");
                item.Click += delegate
                {
                    surface.Elements.PullElementsToTop(this);
                    surface.Elements.Invalidate();
                };
                menu.Items.Add(item);
                item = new ToolStripMenuItem("Up one level");
                item.Click += delegate
                {
                    surface.Elements.PullElementsUp(this);
                    surface.Elements.Invalidate();
                };
                menu.Items.Add(item);
            }
            // Push "down"
            if (push)
            {
                item = new ToolStripMenuItem("Down to bottom");
                item.Click += delegate
                {
                    surface.Elements.PushElementsToBottom(this);
                    surface.Elements.Invalidate();
                };
                menu.Items.Add(item);
                item = new ToolStripMenuItem("Down one level");
                item.Click += delegate
                {
                    surface.Elements.PushElementsDown(this);
                    surface.Elements.Invalidate();
                };
                menu.Items.Add(item);
            }

            // Duplicate
            item = new ToolStripMenuItem("Duplicate selected element");
            item.Click += delegate
            {
                DrawableContainerList dcs = this.Clone();
                dcs.Parent = surface;
                dcs.MoveBy(10, 10);
                surface.AddElements(dcs);
                surface.DeselectAllElements();
                surface.SelectElements(dcs);
            };
            menu.Items.Add(item);

            // Copy
            item = new ToolStripMenuItem("Copy");
            item.Image = ((Image)(editorFormResources.GetObject("copyToolStripMenuItem.Image")));
            item.Click += delegate
            {
                ClipboardHelper.SetClipboardData(typeof(DrawableContainerList), this);
            };
            menu.Items.Add(item);

            // Cut
            item = new ToolStripMenuItem("Cut");
            item.Image = ((Image)(editorFormResources.GetObject("btnCut.Image")));
            item.Click += delegate
            {
                ClipboardHelper.SetClipboardData(typeof(DrawableContainerList), this);
                List<DrawableContainer> containersToDelete = new List<DrawableContainer>();
                foreach (DrawableContainer container in this)
                {
                    containersToDelete.Add(container);
                }
                foreach (DrawableContainer container in containersToDelete)
                {
                    surface.RemoveElement(container, true);
                }
            };
            menu.Items.Add(item);

            // Delete
            item = new ToolStripMenuItem("Delete");
            item.Image = ((Image)(editorFormResources.GetObject("removeObjectToolStripMenuItem.Image")));
            item.Click += delegate
            {
                List<DrawableContainer> containersToDelete = new List<DrawableContainer>();
                foreach (DrawableContainer container in this)
                {
                    containersToDelete.Add(container);
                }
                foreach (DrawableContainer container in containersToDelete)
                {
                    surface.RemoveElement(container, true);
                }
            };
            menu.Items.Add(item);

            // Reset
            bool canReset = false;
            foreach (DrawableContainer container in this)
            {
                if (container.hasDefaultSize)
                {
                    canReset = true;
                }
            }
            if (canReset)
            {
                item = new ToolStripMenuItem("Reset size");
                //item.Image = ((System.Drawing.Image)(editorFormResources.GetObject("removeObjectToolStripMenuItem.Image")));
                item.Click += delegate
                {
                    foreach (DrawableContainer container in this)
                    {
                        if (container.hasDefaultSize)
                        {
                            Size defaultSize = container.DefaultSize;
                            container.Invalidate();
                            container.MakeBoundsChangeUndoable(false);
                            container.Width = defaultSize.Width;
                            container.Height = defaultSize.Height;
                            container.Invalidate();
                        }
                    }
                };
                menu.Items.Add(item);
            }
        }

        public virtual void ShowContextMenu(MouseEventArgs e, Surface surface)
        {
            bool hasMenu = false;
            foreach (DrawableContainer container in this)
            {
                if (container.hasContextMenu)
                {
                    hasMenu = true;
                    break;
                }
            }
            if (hasMenu)
            {
                ContextMenuStrip menu = new ContextMenuStrip();
                AddContextMenuItems(menu, surface);
                if (menu.Items.Count > 0)
                {
                    menu.Show(surface, e.Location);
                    while (true)
                    {
                        if (menu.Visible)
                        {
                            Application.DoEvents();
                            Thread.Sleep(100);
                        }
                        else
                        {
                            menu.Dispose();
                            break;
                        }
                    }
                }
            }
        }
    }
}