// ClassicalSharp copyright 2014-2016 UnknownShadow200 | Licensed under MIT
using System;
using System.IO;
using ClassicalSharp.Textures;

namespace Launcher.Patcher {
	
	public sealed class ResourceChecker {

		public void CheckResourceExistence() {
			string audioPath = Path.Combine(Program.AppDirectory, "audio");
			if (!Directory.Exists(audioPath))
				Directory.CreateDirectory(audioPath);
			DigSoundsExist = CheckDigSoundsExist();
			StepSoundsExist = CheckStepSoundsExist();
			AllResourcesExist = DigSoundsExist && StepSoundsExist;
			
			string texDir = Path.Combine(Program.AppDirectory, "texpacks");
			string zipPath = Path.Combine(texDir, "default.zip");
			bool defaultZipExists = File.Exists(zipPath);
			if (File.Exists(zipPath))
				CheckDefaultZip(zipPath);
			
			CheckTexturePack();
			CheckMusic(audioPath);
			CheckSounds();
		}
		
		void CheckTexturePack() {
			ushort flags = 0;
			foreach (var entry in ResourceList.Files)
				flags |= entry.Value;
			if (flags != 0) AllResourcesExist = false;
			
			if ((flags & ResourceList.cMask) != 0) {
				DownloadSize += 291/1024f; ResourcesCount++;
			}
			if ((flags & ResourceList.mMask) != 0) {
				DownloadSize += 4621/1024f; ResourcesCount++;
			}
			if ((flags & ResourceList.tMask) != 0) {
				DownloadSize += 7/1024f; ResourcesCount++;
			}
			if ((flags & ResourceList.gMask) != 0) {
				DownloadSize += 21/1024f; ResourcesCount++;
			}
		}
		
		void CheckMusic(string audioPath) {
			string[] files = ResourceList.MusicFiles;
			for (int i = 0; i < files.Length; i++) {
				string file = Path.Combine(audioPath, files[i] + ".ogg");
				musicExists[i] = File.Exists(file);
				if (!musicExists[i]) {
					DownloadSize += musicSizes[i] / 1024f;
					ResourcesCount++;
					AllResourcesExist = false;
				}
			}
		}
		
		void CheckSounds() {
			if (!DigSoundsExist) {
				ResourcesCount += ResourceList.DigSounds.Length;
				DownloadSize += 173 / 1024f;
			}
			if (!StepSoundsExist) {
				ResourcesCount += ResourceList.StepSounds.Length;
				DownloadSize += 244 / 1024f;
			}
		}
		
		public bool AllResourcesExist, DigSoundsExist, StepSoundsExist;
		public float DownloadSize;
		public int ResourcesCount;
		internal bool[] musicExists = new bool[7];
		
		void CheckDefaultZip(string path) {
			ZipReader reader = new ZipReader();
			reader.ShouldProcessZipEntry = ShouldProcessZipEntry;
			reader.ProcessZipEntry = ProcessZipEntry;
			
			using (Stream src = new FileStream(path, FileMode.Open, FileAccess.Read))
				reader.Extract(src);
		}

		bool ShouldProcessZipEntry(string filename) {			
			string name = ResourceList.GetFile(filename);
			ResourceList.Files.Remove(name);
			return false;
		}
		
		void ProcessZipEntry(string filename, byte[] data, ZipEntry entry) { }
		
		bool CheckDigSoundsExist() {
			string[] files = ResourceList.DigSounds;
			string path = Path.Combine(Program.AppDirectory, "audio");
			for (int i = 0; i < files.Length; i++) {
				string file = "dig_" + files[i].Substring(1) + ".wav";
				if (!File.Exists(Path.Combine(path, file))) return false;
			}
			return true;
		}
		
		bool CheckStepSoundsExist() {
			string[] files = ResourceList.StepSounds;
			string path = Path.Combine(Program.AppDirectory, "audio");
			for (int i = 0; i < files.Length; i++) {
				string file = "step_" + files[i].Substring(1) + ".wav";
				if (!File.Exists(Path.Combine(path, file))) return false;
			}
			return true;
		}
		static int[] musicSizes = new int[] { 2472, 1931, 2181, 1926, 1714, 1879, 2499 };
	}
}