#region Copyright & License Information
/*
 * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
 * This file is part of OpenRA, which is free software. It is made
 * available to you under the terms of the GNU General Public License
 * as published by the Free Software Foundation. For more information,
 * see COPYING.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Drawing;
using OpenRA.FileFormats;
using OpenRA.Graphics;

namespace OpenRA.Widgets
{
	public class MapPreviewWidget : Widget
	{
		public Func<Map> Map = () => null;
		public Func<Dictionary<int2, Color>> SpawnColors = () => new Dictionary<int2, Color>();
		public Action<MouseInput> OnMouseDown = _ => {};
		public bool IgnoreMouseInput = false;

		static Cache<Map,Bitmap> PreviewCache = new Cache<Map, Bitmap>(stub => Minimap.RenderMapPreview( new Map( stub.Path )));

		public MapPreviewWidget() : base() { }

		protected MapPreviewWidget(MapPreviewWidget other)
			: base(other)
		{
			lastMap = other.lastMap;
			Map = other.Map;
			SpawnColors = other.SpawnColors;
		}

		public override Widget Clone() { return new MapPreviewWidget(this); }

		public override bool HandleMouseInput(MouseInput mi)
        {
			if (IgnoreMouseInput)
				return base.HandleMouseInput(mi);

			if (mi.Event != MouseInputEvent.Down)
				return false;

            OnMouseDown(mi);
            return true;
        }

		public int2 ConvertToPreview(Map map, int2 point)
		{
			return new int2(MapRect.X + (int)(PreviewScale*(point.X - map.Bounds.Left)) , MapRect.Y + (int)(PreviewScale*(point.Y - map.Bounds.Top)));
		}

		Sheet mapChooserSheet;
		Sprite mapChooserSprite;
		Map lastMap;
		Rectangle MapRect;
		float PreviewScale = 0;

		public override void Draw()
		{
			var map = Map();
			if( map == null ) return;

			if (lastMap != map)
			{
				lastMap = map;

				// Update image data
				var preview = PreviewCache[map];
				if( mapChooserSheet == null || mapChooserSheet.Size.Width != preview.Width || mapChooserSheet.Size.Height != preview.Height )
					mapChooserSheet = new Sheet(new Size( preview.Width, preview.Height ) );

				mapChooserSheet.Texture.SetData( preview );
				mapChooserSprite = new Sprite( mapChooserSheet, new Rectangle( 0, 0, map.Bounds.Width, map.Bounds.Height ), TextureChannel.Alpha );
			}

			// Update map rect
			PreviewScale = Math.Min(RenderBounds.Width * 1.0f / map.Bounds.Width, RenderBounds.Height * 1.0f / map.Bounds.Height);
			var size = Math.Max(map.Bounds.Width, map.Bounds.Height);
			var dw = (int)(PreviewScale * (size - map.Bounds.Width)) / 2;
			var dh = (int)(PreviewScale * (size - map.Bounds.Height)) / 2;
			MapRect = new Rectangle(RenderBounds.X + dw, RenderBounds.Y + dh, (int)(map.Bounds.Width * PreviewScale), (int)(map.Bounds.Height * PreviewScale));

			Game.Renderer.RgbaSpriteRenderer.DrawSprite( mapChooserSprite,
				new float2(MapRect.Location),
				new float2( MapRect.Size ) );

			// Overlay spawnpoints
			var colors = SpawnColors();
			foreach (var p in map.SpawnPoints)
			{
				var owned = colors.ContainsKey(p);
				var pos = ConvertToPreview(map, p);
				var sprite = ChromeProvider.GetImage("spawnpoints", owned ? "owned" : "unowned");
				var offset = new int2(-sprite.bounds.Width/2, -sprite.bounds.Height/2);

				if (owned)
					WidgetUtils.FillRectWithColor(new Rectangle(pos.X + offset.X + 2, pos.Y + offset.Y + 2, 12, 12), colors[p]);

				Game.Renderer.RgbaSpriteRenderer.DrawSprite(sprite, pos + offset);
			}
		}
	}
}