/*******************************************************************************
 * Copyright (c) 2011-2014 SirSengir.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser Public License v3
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl-3.0.txt
 *
 * Various Contributors including, but not limited to:
 * SirSengir (original work), CovertJaguar, Player, Binnie, MysteriousAges
 ******************************************************************************/
package forestry.plugins;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;

import java.io.File;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Locale;
import java.util.Random;
import java.util.Set;

import net.minecraft.command.CommandHandler;
import net.minecraft.command.ICommand;
import net.minecraft.server.MinecraftServer;
import net.minecraft.util.StatCollector;
import net.minecraft.world.World;
import net.minecraft.world.chunk.IChunkProvider;

import net.minecraftforge.common.config.Configuration;
import net.minecraftforge.common.config.Property;

import cpw.mods.fml.common.IFuelHandler;
import cpw.mods.fml.common.event.FMLInterModComms;
import cpw.mods.fml.common.network.IGuiHandler;
import cpw.mods.fml.common.registry.GameRegistry;

import forestry.Forestry;
import forestry.api.core.ForestryAPI;
import forestry.core.IPickupHandler;
import forestry.core.IResupplyHandler;
import forestry.core.ISaveEventHandler;
import forestry.core.utils.Log;

public class PluginManager {

	private static final String MODULE_CONFIG_FILE_NAME = "modules.cfg";
	private static final String CATEGORY_MODULES = "modules";

	public static final ArrayList<IGuiHandler> guiHandlers = Lists.newArrayList();
	public static final ArrayList<IPickupHandler> pickupHandlers = Lists.newArrayList();
	public static final ArrayList<ISaveEventHandler> saveEventHandlers = Lists.newArrayList();
	public static final ArrayList<IResupplyHandler> resupplyHandlers = Lists.newArrayList();

	private static final Set<Module> loadedModules = EnumSet.noneOf(Module.class);
	private static final Set<Module> unloadedModules = EnumSet.allOf(Module.class);
	private static Stage stage = Stage.SETUP;

	public enum Stage {
		SETUP, SETUP_DISABLED, PRE_INIT, INIT, POST_INIT, FINISHED
	}

	public enum Module {

		CORE(new PluginCore(), false),
		FLUIDS(new PluginFluids(), false),

		APICULTURE(new PluginApiculture()),
		ARBORICULTURE(new PluginArboriculture()),
		ENERGY(new PluginEnergy()),
		FACTORY(new PluginFactory()),
		FARMING(new PluginFarming()),
		FOOD(new PluginFood()),
		LEPIDOPTEROLOGY(new PluginLepidopterology()),
		MAIL(new PluginMail()),
		STORAGE(new PluginStorage()),

		BUILDCRAFT_FUELS(new PluginBuildCraftFuels()),
		BUILDCRAFT_RECIPES(new PluginBuildCraftRecipes()),
		BUILDCRAFT_STATEMENTS(new PluginBuildCraftStatements()),
		BUILDCRAFT_TRANSPORT(new PluginBuildCraftTransport()),
		
		AGRICRAFT(new PluginAgriCraft()),
		BIOMESOPLENTY(new PluginBiomesOPlenty()),
		CHISEL(new PluginChisel()),
		ENDERIO(new PluginEnderIO()),
		EREBUS(new PluginErebus()),
		EXTRAUTILITIES(new PluginExtraUtilities()),
		GROWTHCRAFT(new PluginGrowthCraft()),
		HARVESTCRAFT(new PluginHarvestCraft()),
		IMMERSIVEENGINEERING(new PluginImmersiveEngineering()),
		INDUSTRIALCRAFT(new PluginIC2()),
		MAGICALCROPS(new PluginMagicalCrops()),
		NATURA(new PluginNatura()),
		PLANTMEGAPACK(new PluginPlantMegaPack()),
		WITCHERY(new PluginWitchery());

		static {
			ForestryAPI.enabledPlugins = new HashSet<>();
		}

		private final ForestryPlugin instance;
		private final boolean canBeDisabled;

		Module(ForestryPlugin plugin) {
			this(plugin, true);
		}

		Module(ForestryPlugin plugin, boolean canBeDisabled) {
			this.instance = plugin;
			this.canBeDisabled = canBeDisabled;
		}

		public ForestryPlugin instance() {
			return instance;
		}

		public boolean isEnabled() {
			return ForestryAPI.enabledPlugins.contains(toString());
		}

		public boolean canBeDisabled() {
			return canBeDisabled;
		}

		public String configName() {
			return toString().toLowerCase(Locale.ENGLISH).replace('_', '.');
		}

	}

	public static final EnumSet<Module> configDisabledModules = EnumSet.noneOf(Module.class);

	public static Stage getStage() {
		return stage;
	}

	public static EnumSet<Module> getLoadedModules() {
		return EnumSet.copyOf(loadedModules);
	}

	private static void registerHandlers(ForestryPlugin plugin) {
		Log.fine("Registering Handlers for Plugin: {0}", plugin);

		IGuiHandler guiHandler = plugin.getGuiHandler();
		if (guiHandler != null) {
			guiHandlers.add(guiHandler);
		}

		plugin.registerPacketHandlers();

		IPickupHandler pickupHandler = plugin.getPickupHandler();
		if (pickupHandler != null) {
			pickupHandlers.add(pickupHandler);
		}

		ISaveEventHandler saveHandler = plugin.getSaveEventHandler();
		if (saveHandler != null) {
			saveEventHandlers.add(saveHandler);
		}

		IResupplyHandler resupplyHandler = plugin.getResupplyHandler();
		if (resupplyHandler != null) {
			resupplyHandlers.add(resupplyHandler);
		}

		IFuelHandler fuelHandler = plugin.getFuelHandler();
		if (fuelHandler != null) {
			GameRegistry.registerFuelHandler((fuelHandler));
		}
	}

	private static void configureModules() {
		Locale locale = Locale.getDefault();
		Locale.setDefault(Locale.ENGLISH);

		Configuration config = new Configuration(new File(Forestry.instance.getConfigFolder(), MODULE_CONFIG_FILE_NAME));

		config.load();
		config.addCustomCategoryComment(CATEGORY_MODULES, "Disabling these modules can greatly change how the mod functions.\n"
				+ "Your mileage may vary, please report any issues.");

		Set<Module> toLoad = EnumSet.allOf(Module.class);
		Iterator<Module> it = toLoad.iterator();
		while (it.hasNext()) {
			Module m = it.next();
			if (!m.canBeDisabled()) {
				continue;
			}
			if (!isEnabled(config, m)) {
				it.remove();
				Log.info("Module disabled: {0}", m);
				continue;
			}
			ForestryPlugin plugin = m.instance;
			if (!plugin.isAvailable()) {
				it.remove();
				Log.info("Module {0} failed to load: {1}", plugin, plugin.getFailMessage());
				continue;
			}
		}

		boolean changed;
		do {
			changed = false;
			it = toLoad.iterator();
			while (it.hasNext()) {
				Module m = it.next();
				Set<Module> deps = m.instance().getDependancies();
				if (!toLoad.containsAll(deps)) {
					it.remove();
					changed = true;
					Log.warning("Module {0} is missing dependencies: {1}", m, deps);
					continue;
				}
			}
		} while (changed);

		unloadedModules.removeAll(toLoad);
		loadedModules.addAll(toLoad);

		for (Module m : loadedModules) {
			ForestryAPI.enabledPlugins.add(m.toString());
		}

		if (config.hasChanged()) {
			config.save();
		}

		Locale.setDefault(locale);
	}

	public static void runSetup() {
		stage = Stage.SETUP;
		configureModules();

		for (Module m : loadedModules) {
			ForestryPlugin plugin = m.instance;
			Log.fine("Setup Start: {0}", plugin);
			plugin.setupAPI();
			Log.fine("Setup Complete: {0}", plugin);
		}

		stage = Stage.SETUP_DISABLED;
		for (Module m : unloadedModules) {
			ForestryPlugin plugin = m.instance;
			Log.fine("Disabled-Setup Start: {0}", plugin);
			plugin.disabledSetupAPI();
			Log.fine("Disabled-Setup Complete: {0}", plugin);
		}
	}

	public static void runPreInit() {
		stage = Stage.PRE_INIT;
		for (Module m : loadedModules) {
			ForestryPlugin plugin = m.instance;
			Log.fine("Pre-Init Start: {0}", plugin);
			registerHandlers(plugin);
			plugin.preInit();
			plugin.registerItems();
			if (Module.BUILDCRAFT_STATEMENTS.isEnabled()) {
				plugin.registerTriggers();
			}
			if (Module.STORAGE.isEnabled()) {
				plugin.registerBackpackItems();
				plugin.registerCrates();
			}
			Log.fine("Pre-Init Complete: {0}", plugin);
		}
	}

	public static void runInit() {
		stage = Stage.INIT;
		for (Module m : loadedModules) {
			ForestryPlugin plugin = m.instance;
			Log.fine("Init Start: {0}", plugin);
			plugin.doInit();
			plugin.registerRecipes();
			Log.fine("Init Complete: {0}", plugin);
		}
	}

	public static void runPostInit() {
		stage = Stage.POST_INIT;
		for (Module m : loadedModules) {
			ForestryPlugin plugin = m.instance;
			Log.fine("Post-Init Start: {0}", plugin);
			plugin.postInit();
			Log.fine("Post-Init Complete: {0}", plugin);
		}

		stage = Stage.FINISHED;
	}

	public static void serverStarting(MinecraftServer server) {
		CommandHandler commandManager = (CommandHandler) server.getCommandManager();

		for (Module m : loadedModules) {
			ForestryPlugin plugin = m.instance;
			ICommand[] commands = plugin.getConsoleCommands();
			if (commands == null) {
				continue;
			}
			for (ICommand command : commands) {
				commandManager.registerCommand(command);
			}
		}
	}

	public static void processIMCMessages(ImmutableList<FMLInterModComms.IMCMessage> messages) {
		for (FMLInterModComms.IMCMessage message : messages) {
			for (Module m : loadedModules) {
				ForestryPlugin plugin = m.instance;
				if (plugin.processIMCMessage(message)) {
					break;
				}
			}
		}
	}

	public static void populateChunk(IChunkProvider chunkProvider, World world, Random rand, int chunkX, int chunkZ, boolean hasVillageGenerated) {
		for (Module m : loadedModules) {
			ForestryPlugin plugin = m.instance;
			plugin.populateChunk(chunkProvider, world, rand, chunkX, chunkZ, hasVillageGenerated);
		}
	}

	public static void populateChunkRetroGen(World world, Random rand, int chunkX, int chunkZ) {
		for (Module m : loadedModules) {
			ForestryPlugin plugin = m.instance;
			plugin.populateChunkRetroGen(world, rand, chunkX, chunkZ);
		}
	}

	private static boolean isEnabled(Configuration config, Module m) {
		Plugin info = m.instance().getClass().getAnnotation(Plugin.class);

		String comment = StatCollector.translateToLocal(info.unlocalizedDescription());
		Property prop = config.get(CATEGORY_MODULES, m.configName(), true, comment);
		boolean enabled = prop.getBoolean();

		if (!enabled) {
			configDisabledModules.add(m);
		}

		return enabled;
	}
}