using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using UnityEngine;

namespace AllocsFixes
{
	public static class Mods {
		public class ModData {
			public Assembly assembly;
			public string name;
			public string version;
			public ModAPI apiInstance;
		}

		private static readonly string MOD_PATH = Application.dataPath + "/../Mods";
		private static Dictionary<string, ModData> loadedMods = new Dictionary<string, ModData> ();

		public static void LoadMods () {
			if (Directory.Exists (MOD_PATH)) {
				Log.Out ("Loading mods");

				foreach (string modDir in Directory.GetDirectories (MOD_PATH)) {
					foreach (string modDll in Directory.GetFiles (modDir, "*.dll")) {
						try {
							Assembly assemblyInstance = Assembly.LoadFrom (modDll);

							ModData md = new ModData ();
							md.assembly = assemblyInstance;

							md.apiInstance = CreateApiInstance (md);
							if (md.apiInstance == null) {
								Log.Warning ("DLL does not declare a class of type ModAPI, ignoring");
								continue;
							}
							if (string.IsNullOrEmpty (md.apiInstance.ModName ())) {
								Log.Warning ("DLL's ModAPI does not override ModName(), ignoring");
								continue;
							}
							if (loadedMods.ContainsKey (md.apiInstance.ModName ())) {
								Log.Warning ("DLL's ModAPI.ModName() returns name that's already loaded, ignoring");
								continue;
							}
							md.name = md.apiInstance.ModName ();
							md.version = md.apiInstance.ModVersion ();

							loadedMods.Add (md.name, md);

							Log.Out ("Loaded mod: " + md.name + " (" + md.version + ")");
						} catch (Exception e) {
							Log.Error ("Failed loading DLL");
							Log.Exception (e);
						}
					}
				}

				Log.Out ("Loading mods done");
			} else {
				Log.Out ("No mods folder found");
			}
		}

		public static bool ModLoaded (string _modName) {
			return loadedMods.ContainsKey (_modName);
		}

		public static Assembly GetModAssembly (string _modName) {
			if (ModLoaded (_modName)) {
				return loadedMods [_modName].assembly;
			}
			return null;
		}

		public static List<ModData> LoadedMods () {
			List<ModData> res = new List<ModData> ();
			foreach (ModData md in loadedMods.Values) {
				res.Add (md);
			}
			return res;
		}

		private static ModAPI CreateApiInstance (ModData _md) {
			Type modApiType = typeof (ModAPI);
			foreach (Type t in _md.assembly.GetTypes ()) {
				if (modApiType.IsAssignableFrom (t)) {
					Log.Out ("Found ModAPI");

					return Activator.CreateInstance(t) as ModAPI;
				}
			}
			return null;
		}

		public static void CallGameAwake () {
			foreach (ModData md in loadedMods.Values) {
				if (md.apiInstance != null) {
					md.apiInstance.GameAwake ();
				}
			}
		}

		public static void CallGameShutdown () {
			foreach (ModData md in loadedMods.Values) {
				if (md.apiInstance != null) {
					md.apiInstance.GameShutdown ();
				}
			}
		}

		public static void CallSavePlayerData (int _clientId, PlayerDataFile _playerDataFile) {
			foreach (ModData md in loadedMods.Values) {
				if (md.apiInstance != null) {
					md.apiInstance.SavePlayerData (_clientId, _playerDataFile);
				}
			}
		}

		public static void CallRequestToSpawnPlayer (int _clientId, string _name, int _chunkViewDim, PlayerProfile _playerProfile) {
			foreach (ModData md in loadedMods.Values) {
				if (md.apiInstance != null) {
					md.apiInstance.RequestToSpawnPlayer (_clientId, _name, _chunkViewDim, _playerProfile);
				}
			}
		}

		public static void CallPlayerDisconnected (ClientInfo _cInfo, bool _bShutdown) {
			foreach (ModData md in loadedMods.Values) {
				if (md.apiInstance != null) {
					md.apiInstance.PlayerDisconnected (_cInfo, _bShutdown);
				}
			}
		}

		public static void CallCalcMapColors (Chunk _chunk) {
			foreach (ModData md in loadedMods.Values) {
				if (md.apiInstance != null) {
					md.apiInstance.CalcMapColors (_chunk);
				}
			}
		}

	
	}
}