#region Copyright & License Information
/*
 * Copyright 2007-2018 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, either version 3 of
 * the License, or (at your option) any later version. For more
 * information, see COPYING.
 */
#endregion

using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using OpenRA.Graphics;
using OpenRA.Mods.Common.LoadScreens;
using OpenRA.Widgets;

namespace OpenRA.Mods.Cnc
{
	public sealed class CncLoadScreen : BlankLoadScreen
	{
		readonly NullInputHandler nih = new NullInputHandler();

		Dictionary<string, string> loadInfo;
		Stopwatch loadTimer = Stopwatch.StartNew();
		Sheet sheet;
		Sprite borderTop, borderBottom, borderLeft, borderRight,
			cornerTopLeft, cornerTopRight, cornerBottomLeft, cornerBottomRight;
		int loadTick;
		float2 nodPos, gdiPos, evaPos;
		Sprite nodLogo, gdiLogo, evaLogo, brightBlock, dimBlock;
		Rectangle bounds;
		Renderer r;

		public override void Init(ModData modData, Dictionary<string, string> info)
		{
			base.Init(modData, info);

			loadInfo = info;

			// Avoid standard loading mechanisms so we
			// can display loadscreen as early as possible
			r = Game.Renderer;
			if (r == null) return;

			using (var stream = modData.DefaultFileSystem.Open(info["Image"]))
				sheet = new Sheet(SheetType.BGRA, stream);

			var res = r.Resolution;
			bounds = new Rectangle(0, 0, res.Width, res.Height);

			borderTop = new Sprite(sheet, new Rectangle(161, 128, 62, 33), TextureChannel.RGBA);
			borderBottom = new Sprite(sheet, new Rectangle(161, 223, 62, 33), TextureChannel.RGBA);
			borderLeft = new Sprite(sheet, new Rectangle(128, 161, 33, 62), TextureChannel.RGBA);
			borderRight = new Sprite(sheet, new Rectangle(223, 161, 33, 62), TextureChannel.RGBA);
			cornerTopLeft = new Sprite(sheet, new Rectangle(128, 128, 33, 33), TextureChannel.RGBA);
			cornerTopRight = new Sprite(sheet, new Rectangle(223, 128, 33, 33), TextureChannel.RGBA);
			cornerBottomLeft = new Sprite(sheet, new Rectangle(128, 223, 33, 33), TextureChannel.RGBA);
			cornerBottomRight = new Sprite(sheet, new Rectangle(223, 223, 33, 33), TextureChannel.RGBA);

			nodLogo = new Sprite(sheet, new Rectangle(0, 256, 256, 256), TextureChannel.RGBA);
			gdiLogo = new Sprite(sheet, new Rectangle(256, 256, 256, 256), TextureChannel.RGBA);
			evaLogo = new Sprite(sheet, new Rectangle(256, 64, 128, 64), TextureChannel.RGBA);
			nodPos = new float2(bounds.Width / 2 - 384, bounds.Height / 2 - 128);
			gdiPos = new float2(bounds.Width / 2 + 128, bounds.Height / 2 - 128);
			evaPos = new float2(bounds.Width - 43 - 128, 43);

			brightBlock = new Sprite(sheet, new Rectangle(320, 0, 16, 35), TextureChannel.RGBA);
			dimBlock = new Sprite(sheet, new Rectangle(336, 0, 16, 35), TextureChannel.RGBA);

			versionText = modData.Manifest.Metadata.Version;
		}

		bool setup;
		SpriteFont loadingFont, versionFont;
		string loadingText, versionText;
		float2 loadingPos, versionPos;

		public override void Display()
		{
			if (r == null || loadTimer.Elapsed.TotalSeconds < 0.25)
				return;

			loadTimer.Restart();

			loadTick = ++loadTick % 8;
			r.BeginFrame(int2.Zero, 1f);
			r.RgbaSpriteRenderer.DrawSprite(gdiLogo, gdiPos);
			r.RgbaSpriteRenderer.DrawSprite(nodLogo, nodPos);
			r.RgbaSpriteRenderer.DrawSprite(evaLogo, evaPos);

			WidgetUtils.DrawPanelPartial(bounds, PanelSides.Edges,
				borderTop, borderBottom, borderLeft, borderRight,
				cornerTopLeft, cornerTopRight, cornerBottomLeft, cornerBottomRight,
				null);
			var barY = bounds.Height - 78;

			if (!setup && r.Fonts != null)
			{
				loadingFont = r.Fonts["BigBold"];
				loadingText = loadInfo["Text"];
				loadingPos = new float2((bounds.Width - loadingFont.Measure(loadingText).X) / 2, barY);

				versionFont = r.Fonts["Regular"];
				var versionSize = versionFont.Measure(versionText);
				versionPos = new float2(bounds.Width - 107 - versionSize.X / 2, 115 - versionSize.Y / 2);

				setup = true;
			}

			if (loadingFont != null)
				loadingFont.DrawText(loadingText, loadingPos, Color.Gray);
			if (versionFont != null)
				versionFont.DrawTextWithContrast(versionText, versionPos, Color.White, Color.Black, 2);

			for (var i = 0; i <= 8; i++)
			{
				var block = loadTick == i ? brightBlock : dimBlock;
				r.RgbaSpriteRenderer.DrawSprite(block,
					new float2(bounds.Width / 2 - 114 - i * 32, barY));
				r.RgbaSpriteRenderer.DrawSprite(block,
					new float2(bounds.Width / 2 + 114 + i * 32 - 16, barY));
			}

			r.EndFrame(nih);
		}

		protected override void Dispose(bool disposing)
		{
			if (disposing && sheet != null)
				sheet.Dispose();

			base.Dispose(disposing);
		}
	}
}