/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2010  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;
using System.Collections;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

using Greenshot.Drawing.Fields;
using Greenshot.Plugin;

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<DrawableContainer> {
		
		public DrawableContainerList() {
		}
		
		public EditStatus Status {
			get { 
				return this[Count-1].Status; 
			}
			set {
				foreach(DrawableContainer dc in this) dc.Status = value; 
			}
		}
		
		/// <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>
		/// 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) {
			foreach(DrawableContainer dc in this) {
				dc.Left += dx;
				dc.Top += dy;
			}
		}
		
		/// <summary>
		/// Hides the grippers of all elements in the list.
		/// </summary>
		public void HideGrippers() {
			foreach(DrawableContainer dc in this) {
				dc.HideGrippers();
			}
		}
		
		/// <summary>
		/// Shows the grippers of all elements in the list.
		/// </summary>
		public void ShowGrippers() {
			foreach(DrawableContainer dc in this) {
				dc.ShowGrippers();
			}
		}
		
		/// <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 DrawableContainer 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>
		/// Triggers all elements in the list ot be redrawn.
		/// </summary>
		/// <param name="g">the related Graphics object</param>
		/// <param name="rm">the rendermode in which the element is to be drawn</param>
		public void Draw(Graphics g, Bitmap bitmap, RenderMode rm) {
			foreach(DrawableContainer dc in this) {
				dc.DrawContent(g, bitmap, rm);
			}
		}
		
		/// <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 == this.Count) return false;
			foreach(DrawableContainer element in elements) {
				if(this.IndexOf(element) < this.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=this.Count-1; i>=0; i--) {
				DrawableContainer 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) {
			DrawableContainer[] dcs = this.ToArray();
			for(int i=0; i<dcs.Length; i++) {
				DrawableContainer dc = dcs[i];
				if(elements.Contains(dc)) {
					this.Remove(dc);
					this.Add(dc);
				}
			}
		}
		
		/// <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 == this.Count) return false;
			foreach(DrawableContainer element in elements) {
				if(this.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++) {
				DrawableContainer 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) {
			DrawableContainer[] dcs = this.ToArray();
			for(int i=dcs.Length-1; i>=0; i--) {
				DrawableContainer dc = dcs[i];
				if(elements.Contains(dc)) {
					this.Remove(dc);
					this.Insert(0, dc);
				}
			}
		}
		
		/// <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) {
				DrawableContainer dc = this[index1];
				this[index1] = this[index2];
				this[index2] = dc;
			}
		}

	}
}