using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using OpenRA.FileFormats;
using System.Drawing;

namespace OpenRA.Editor
{
	class Surface : Control
	{
		public Map Map { get; set; }
		public TileSet TileSet { get; set; }
		public Palette Palette { get; set; }
		public int2 Offset { get; set; }
		public Pair<ushort, Bitmap> Brush { get; set; }

		Dictionary<int2, Bitmap> Chunks = new Dictionary<int2, Bitmap>();

		public Surface()
			: base()
		{
			BackColor = Color.Black;

			SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
			SetStyle(ControlStyles.ResizeRedraw, true);
			UpdateStyles();
		}

		public const int CellSize = 24;
		static readonly Pen RedPen = new Pen(Color.Red);
		int2 MousePos;

		protected override void OnMouseMove(MouseEventArgs e)
		{
			base.OnMouseMove(e);
			MousePos = new int2(e.Location);
			Invalidate();
		}

		protected override void OnMouseDown(MouseEventArgs e)
		{
			base.OnMouseDown(e);
			if (e.Button == MouseButtons.Right)
				Brush = Pair.New((ushort)0, null as Bitmap);

			Invalidate();
		}

		const int ChunkSize = 8;		// 8x8 chunks ==> 192x192 bitmaps.

		Bitmap RenderChunk(int u, int v)
		{
			var bitmap = new Bitmap(ChunkSize * 24, ChunkSize * 24);
			return bitmap;
		}

		protected override void OnPaint(PaintEventArgs e)
		{
			if (Map == null) return;
			if (TileSet == null) return;

			for( var u = Map.TopLeft.X - Map.TopLeft.X % ChunkSize; u < Map.BottomRight.X; u += ChunkSize )
				for (var v = Map.TopLeft.Y - Map.TopLeft.Y % ChunkSize; v < Map.BottomRight.Y; v += ChunkSize)
				{
					var x = new int2(u,v);
					if (!Chunks.ContainsKey(x)) Chunks[x] = RenderChunk(u, v);
					e.Graphics.DrawImage(Chunks[x], u * ChunkSize * 24, v * ChunkSize * 24);
				}

			if (Brush.Second != null)
				e.Graphics.DrawImage(Brush.Second, 
					(MousePos - new int2(MousePos.X % 24, MousePos.Y % 24)).ToPoint());
		}
	}
}