/*
 * 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.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Runtime.Serialization;
using System.Windows.Forms;

using Greenshot.Configuration;
using Greenshot.Controls;
using Greenshot.Drawing.Fields;
using Greenshot.Drawing.Filters;
using Greenshot.Helpers;
using Greenshot.Plugin;

namespace Greenshot.Drawing {
	/// <summary>
	/// represents a rectangle, ellipse, label or whatever. Can contain filters, too.
	/// serializable for clipboard support
	/// Subclasses should fulfill INotifyPropertyChanged contract, i.e. call
	/// OnPropertyChanged whenever a public property has been changed.
	/// </summary>
	[Serializable()]
	public abstract class DrawableContainer : AbstractFieldHolderWithChildren, INotifyPropertyChanged, IDrawableContainer {
		
		private static readonly log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(DrawableContainer));
		
		[NonSerialized]
		private PropertyChangedEventHandler propertyChanged;
		public event PropertyChangedEventHandler PropertyChanged {
			add { propertyChanged += value; }
			remove{ propertyChanged -= value; }
		}
		

		
//		public List<IFilter> filters = new List<IFilter>();
		public List<IFilter> Filters {
			get {
				List<IFilter> ret = new List<IFilter>();
				foreach(IFieldHolder c in Children) {
					if(c is IFilter) ret.Add(c as IFilter);
				}
				return ret;
			}
		}
		
		[NonSerialized]
		protected Surface parent;
		public ISurface Parent {
			get { return parent; }
			set { SwitchParent((Surface)value); }
		}
		[NonSerialized]
		protected Label[] grippers;
		private bool layoutSuspended = false;
		[NonSerialized]
		protected Label childLabel;
		
		[NonSerialized]
		private bool selected = false;
		public bool Selected {
			get {return selected;}
			set {selected = value; OnPropertyChanged("Selected"); }
		}
		
		[NonSerialized]
		public EditStatus Status = EditStatus.UNDRAWN;
		
		private int left = 0;
		public int Left {
			get { return left; }
			set { left = value; DoLayout(); OnPropertyChanged("Left"); }
		}
		
		private int top = 0;
		public int Top {
			get { return top; }
			set { top = value; DoLayout(); OnPropertyChanged("Top"); }
		}
		
		private int width = 0;
		public int Width {
			get { return width; }
			set { width = value; DoLayout(); OnPropertyChanged("Width"); }
		}
		
		private int height = 0;
		public int Height {
			get { return height; }
			set { height = value; DoLayout(); OnPropertyChanged("Height"); }
		}
		
		public Rectangle Bounds {
			get { return GuiRectangle.GetGuiRectangle(left, top, width, height); }
		}
		
		public DrawableContainer(Surface parent) {
			this.parent = parent;
			InitControls();
		}

		public void Add(IFilter filter) {
			AddChild(filter);
		}
		
		public void Remove(IFilter filter) {
			RemoveChild(filter);
		}
		
		public Label GetLabel() {
			return childLabel;
		}
		
		public void AlignToParent(HorizontalAlignment horizontalAlignment, VerticalAlignment verticalAlignment) {
			
			int lineThickness = GetFieldValueAsInt(FieldType.LINE_THICKNESS);
			if (horizontalAlignment == HorizontalAlignment.Left) {
				Left = lineThickness/2;
			}
			if (horizontalAlignment == HorizontalAlignment.Right) {
				Left = parent.Width - this.Width - lineThickness/2;
			}
			if (horizontalAlignment == HorizontalAlignment.Center) {
				Left = (parent.Width / 2) - (this.Width / 2) - lineThickness/2;
			}

			if (verticalAlignment == VerticalAlignment.TOP) {
				Top = lineThickness/2;
			}
			if (verticalAlignment == VerticalAlignment.BOTTOM) {
				Top = parent.Height - this.Height - lineThickness/2;
			}
			if (verticalAlignment == VerticalAlignment.CENTER) {
				Top = (parent.Height / 2) - (this.Height / 2) - lineThickness/2;
			}
		}
		
		public virtual bool InitContent() { return true; }
		
		public virtual void OnDoubleClick() {}
		
		private void InitControls() {
			InitGrippers();
			childLabel = new Label();
			childLabel.BackColor = Color.Transparent;
			childLabel.BorderStyle = BorderStyle.None;
			childLabel.Cursor = Cursors.SizeAll;
			childLabel.MouseDown += new MouseEventHandler(gripperMouseDown);
			childLabel.MouseUp += new MouseEventHandler(gripperMouseUp);
			childLabel.MouseMove += new MouseEventHandler(childLabelMouseMove);
			
			DoLayout();
		}
		
		void InitGrippers() {
			grippers = new Label[8];
			for(int i=0; i<grippers.Length; i++) {
				grippers[i] = new Label();
				grippers[i].Name = "gripper" + i;
				grippers[i].Width = grippers[i].Height = 5;
				grippers[i].BackColor = Color.Black;
				grippers[i].MouseDown += new MouseEventHandler(gripperMouseDown);
				grippers[i].MouseUp += new MouseEventHandler(gripperMouseUp);
				grippers[i].MouseMove += new MouseEventHandler(gripperMouseMove);
				grippers[i].Visible = false;
			}
			grippers[1].Cursor = Cursors.SizeNS;
			grippers[3].Cursor = Cursors.SizeWE;
			grippers[5].Cursor = Cursors.SizeNS;
			grippers[7].Cursor = Cursors.SizeWE;
			if(parent != null) parent.Controls.AddRange(grippers); // otherwise we'll attach them in switchParent
		}
		
		public void SuspendLayout() {
			layoutSuspended = true;
			childLabel.SuspendLayout();
		}
		
		public void ResumeLayout() {
			layoutSuspended = false;
			DoLayout();
			childLabel.ResumeLayout();
		}
		
		private void DoLayout() {
			if (!layoutSuspended) {
				int[] xChoords = new int[]{this.Left-2,this.Left+this.Width/2-2,this.Left+this.Width-2};
				int[] yChoords = new int[]{this.Top-2,this.Top+this.Height/2-2,this.Top+this.Height-2};

				grippers[0].Left = xChoords[0]; grippers[0].Top = yChoords[0];
				grippers[1].Left = xChoords[1]; grippers[1].Top = yChoords[0];
				grippers[2].Left = xChoords[2]; grippers[2].Top = yChoords[0];
				grippers[3].Left = xChoords[2]; grippers[3].Top = yChoords[1];
				grippers[4].Left = xChoords[2]; grippers[4].Top = yChoords[2];
				grippers[5].Left = xChoords[1]; grippers[5].Top = yChoords[2];
				grippers[6].Left = xChoords[0]; grippers[6].Top = yChoords[2];
				grippers[7].Left = xChoords[0]; grippers[7].Top = yChoords[1];
				
				if((grippers[0].Left < grippers[4].Left && grippers[0].Top < grippers[4].Top) ||
					grippers[0].Left > grippers[4].Left && grippers[0].Top > grippers[4].Top) {
					grippers[0].Cursor = Cursors.SizeNWSE;
					grippers[2].Cursor = Cursors.SizeNESW;
					grippers[4].Cursor = Cursors.SizeNWSE;
					grippers[6].Cursor = Cursors.SizeNESW;
				} else if((grippers[0].Left > grippers[4].Left && grippers[0].Top < grippers[4].Top) ||
					grippers[0].Left < grippers[4].Left && grippers[0].Top > grippers[4].Top) {
					grippers[0].Cursor = Cursors.SizeNESW;
					grippers[2].Cursor = Cursors.SizeNWSE;
					grippers[4].Cursor = Cursors.SizeNESW;
					grippers[6].Cursor = Cursors.SizeNWSE;
				} else if (grippers[0].Left == grippers[4].Left) {
					grippers[0].Cursor = Cursors.SizeNS;
					grippers[4].Cursor = Cursors.SizeNS;
				} else if (grippers[0].Top == grippers[4].Top) {
					grippers[0].Cursor = Cursors.SizeWE;
					grippers[4].Cursor = Cursors.SizeWE;
				}
				
				childLabel.Left = this.Left;
				childLabel.Top = this.Top;
				childLabel.Width = this.Width;
				childLabel.Height = this.Height;
			}
		}
		
		public virtual void Dispose() {
			for(int i=0; i<grippers.Length; i++) {
				grippers[i].Dispose();
			}
			childLabel.Dispose();
			
			FieldAggregator aggProps = parent.FieldAggregator;
			aggProps.UnbindElement(this);
			
			
		}
		
		int mx;
		int my;
		private void gripperMouseDown(object sender, MouseEventArgs e) {
			mx = e.X;
			my = e.Y;
			Status = EditStatus.RESIZING;
			parent.Invalidate();
		}

		private void gripperMouseUp(object sender, MouseEventArgs e) {
			Status = EditStatus.IDLE;
			parent.Invalidate();
		}
		
		private void gripperMouseMove(object sender, MouseEventArgs e) {
			if(Status.Equals(EditStatus.RESIZING)) {
				SuspendLayout();
				Label gr = (Label)sender;
				int gripperIndex = Int16.Parse(gr.Name.Substring(7));
				if(gripperIndex <= 2) { // top row
					this.Top += e.Y - my;
					this.Height -= e.Y - my;
				} else if(gripperIndex >= 4 && gripperIndex <= 6) { // bottom row
					this.Height += e.Y - my;
				}
				if(gripperIndex >=2 && gripperIndex <= 4) { // right row
					this.Width += e.X - mx;
				} else if(gripperIndex >=6 || gripperIndex == 0) { // left row
					this.Left += e.X - mx;
					this.Width -= e.X - mx;
				}
				ResumeLayout();
				parent.Invalidate();
			}
		}
		
		private void childLabelMouseMove(object sender, MouseEventArgs e) {
			if (Status.Equals(EditStatus.RESIZING)) {
				SuspendLayout();
				this.Left += e.X - mx;
				this.Top += e.Y - my;
				ResumeLayout();
				parent.Invalidate();
			}
		}
		
		public abstract void Draw(Graphics graphics, RenderMode renderMode);
		
		public virtual void DrawContent(Graphics graphics, Bitmap bmp, RenderMode renderMode) {
			//if(LOG.IsDebugEnabled) LOG.Debug("Drawing container "+this+" with bounds "+Bounds+" and " + Children.Count + " children and status: "+Status);
			if(Children.Count>0) {
				if(!Status.Equals(EditStatus.IDLE)) {
					DrawSelectionBorder(graphics, Bounds);
				} else {
					Rectangle effRect = Bounds;
					
					if(!effRect.IsEmpty) {
						foreach(IFilter filter in Filters) {
							//if(LOG.IsDebugEnabled) LOG.Debug("Applying filter "+filter+" with bounds "+effRect);
							filter.Apply(graphics, bmp, effRect, renderMode);
						}
					}
	
				}
			}
			Draw(graphics, RenderMode.EDIT);
		}
		
		public virtual bool Contains(int x, int y) {
			return Bounds.Contains(x,y);
		}
		
		public virtual bool ClickableAt(int x, int y) {
			Rectangle r = GuiRectangle.GetGuiRectangle(Left, Top, Width, Height);
			r.Inflate(5, 5);
			return r.Contains(x, y);
		}
		
		protected void DrawSelectionBorder(Graphics g, Rectangle rect) {
			using (Pen pen = new Pen(Color.MediumSeaGreen)) {
				pen.DashPattern = new float[]{1,2};
				pen.Width = 1;
				g.DrawRectangle(pen, rect);
			}
		}
		
		public void ShowGrippers() {
			for(int i=0; i<grippers.Length; i++) {
				if(grippers[i].Enabled) grippers[i].Show();
				else grippers[i].Hide();
			}
			this.ResumeLayout();
		}
		
		public void HideGrippers() {
			this.SuspendLayout();
			for(int i=0; i<grippers.Length; i++) {
				grippers[i].Hide();
			}
		}
		
		public void MoveBy(int dx, int dy) {
			this.SuspendLayout();
			this.Left += dx;
			this.Top += dy;
			this.ResumeLayout();
		}
		
		private void SwitchParent(Surface newParent) {
			if(parent != null) {
				for(int i=0; i<grippers.Length; i++) {
					parent.Controls.Remove(grippers[i]);
				}
			} else if(grippers == null) {
				InitControls();
			}
			parent = newParent;
			parent.Controls.AddRange(grippers);
			foreach(IFilter filter in Filters) {
				filter.Parent = this;
			}
		}
		
		// drawablecontainers are regarded equal if they are of the same type and their bounds are equal. this should be sufficient.
		public override bool Equals(object obj) {
			bool ret = false;
			if(obj != null && GetType().Equals(obj.GetType())) {
				DrawableContainer other = obj as DrawableContainer;
				if(left==other.left && top==other.top && width==other.width && height==other.height) ret = true;
			}
			return ret;
		}
		
		public override int GetHashCode() {
			return left.GetHashCode() ^ top.GetHashCode() ^ width.GetHashCode() ^ height.GetHashCode() ^ GetFields().GetHashCode();
		}
		
		protected void OnPropertyChanged(string propertyName) {
			if(propertyChanged != null) propertyChanged(this, new PropertyChangedEventArgs(propertyName));
		}
	}
}