package xyz.spaceio.customoregen;

import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Optional;
import java.util.UUID;
import java.util.stream.Collectors;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.OfflinePlayer;
import org.bukkit.World;
import org.bukkit.command.ConsoleCommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;

import com.google.gson.reflect.TypeToken;

import de.Linus122.SpaceIOMetrics.Metrics;
import xyz.spaceio.configutils.ConfigHandler;
import xyz.spaceio.configutils.JSONConfig;
import xyz.spaceio.hooks.HookInfo;
import xyz.spaceio.hooks.HookVanilla;
import xyz.spaceio.hooks.SkyblockAPICached;
import xyz.spaceio.hooks.SkyblockAPIHook;
import xyz.spaceio.misc.NamePlaceholder;

public class CustomOreGen extends JavaPlugin {

	/*
	 * Configurations for all generators (defined in the config.yml)
	 */
	private List<GeneratorConfig> generatorConfigs = new ArrayList<GeneratorConfig>();

	/*
	 * Disabled worlds blacklist
	 */
	private List<String> disabledWorlds = new ArrayList<String>();

	/*
	 * Our logger
	 */
	private ConsoleCommandSender clogger;

	/*
	 * Cache for GeneratorConfig ID's for each player
	 */
	private HashMap<UUID, Integer> cachedOregenConfigs = new HashMap<UUID, Integer>();
	private JSONConfig cachedOregenJsonConfig;

	/*
	 * API Hook for the corresponding SkyBlock plugin
	 */
	private SkyblockAPIHook skyblockAPI;
	
	/*
	 * API Hook but cached
	 */
	private SkyblockAPICached skyblockAPICached;


	/*
	 * Object that handles the loading process of the config.yml file
	 */
	private ConfigHandler configHandler = new ConfigHandler(this, "plugins/CustomOreGen/config.yml");;

	/*
	 * Prefix for the clogger
	 */
	private final String PREFIX = "§6[CustomOreGen] ";
	
	/*
	 * Main event class
	 */
	private Events events;


	@Override
	public void onEnable() {
		clogger = getServer().getConsoleSender();
		
		PluginManager pm = Bukkit.getPluginManager();

		this.loadHook();

		Bukkit.getPluginCommand("customoregen").setExecutor(new Cmd(this));

		// load the config.yml
		try {
			configHandler.loadConfig();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		events = new Events(this);
		
		pm.registerEvents(events, this);

		// some persisting saving stuff
		
		cachedOregenJsonConfig = new JSONConfig(new TypeToken<HashMap<UUID, Integer>>() {
		}.getType(), cachedOregenConfigs, this);

		cachedOregenConfigs = (HashMap<UUID, Integer>) cachedOregenJsonConfig.getObject();

		if (cachedOregenConfigs == null) {
			cachedOregenConfigs = new HashMap<UUID, Integer>();
		}
		
		disabledWorlds = getConfig().getStringList("disabled-worlds");
		
		// registering place holders
        if(Bukkit.getPluginManager().getPlugin("PlaceholderAPI") != null) {
        	new NamePlaceholder(this).register();
        }
		
		new Metrics(this);
	}
	
	@Override
	public void onDisable() {
		cachedOregenJsonConfig.saveToDisk();
	}

	/**
	 * Acquires the corresponding skyblock hook class
	 */
	private void loadHook() {
		skyblockAPI = getHook(); 
		skyblockAPICached = new SkyblockAPICached(skyblockAPI);
	}
	
	public SkyblockAPIHook getHook() {
		Throwable loadException = null;
		SkyblockAPIHook skyblockAPI = null;
		
		for(HookInfo hookInfo : HookInfo.values()) {
			String pluginName = hookInfo.name().replace("Legacy", "");
			if(Bukkit.getServer().getPluginManager().isPluginEnabled(pluginName)) {
				sendConsole(String.format("&aUsing %s as SkyBlock-Plugin, hook class: %s", pluginName, hookInfo.getHookClass().getName()));
				try {
					for (Constructor<?> constructor : hookInfo.getHookClass().getDeclaredConstructors()) {
						if(constructor.getParameterCount() > 0) {
							skyblockAPI = (SkyblockAPIHook) constructor.newInstance(this);
						} else {
							skyblockAPI = (SkyblockAPIHook) constructor.newInstance();
						}
					}
				}catch(NoClassDefFoundError | IllegalArgumentException | InvocationTargetException | InstantiationException | IllegalAccessException e) {
					loadException = e;
					continue;
				}
				break;
			}
		}
		
		if(skyblockAPI == null) {
			if(loadException != null)
				loadException.printStackTrace();
			sendConsole("§cYou are not using any supported skyblock plugin! Will use the vanilla range check hook instead.");
			skyblockAPI = new HookVanilla();
		}
		
		return skyblockAPI;
	}

	/**
	 * @return all active skyblock worlds
	 */
	public List<World> getActiveWorlds() {
		return Arrays.stream(skyblockAPI.getSkyBlockWorldNames()).map(v -> Bukkit.getWorld(v))
				.collect(Collectors.toList());
	}

	/**
	 * Returns the current island level based on the skyblock world and player.
	 * 
	 * @param uuid UUID of the player to check
	 * @param world the world of the island to check the level
	 * @return player's island level
	 */
	public int getLevel(UUID uuid, String world) {
		return this.getSkyblockAPICached().getIslandLevel(uuid, world);
	}

	/**
	 * Gathers the owner of an island at a certain location
	 * 
	 * @param loc Location to check
	 * @return owner
	 */
	public OfflinePlayer getOwner(Location loc) {
		if (this.getSkyblockAPICached().getIslandOwner(loc) == null) {
			return null;
		}
		Optional<UUID> uuid = this.getSkyblockAPICached().getIslandOwner(loc);
		if (!uuid.isPresent()) {
			return null;
		}
		OfflinePlayer p = Bukkit.getOfflinePlayer(uuid.get());

		return p;
	}
	
	/**
	 * Gets the skyblock hook name in use
	 * 
	 * @return The name of the hook class
	 */
	public String getHookName() {
		return this.skyblockAPI.getClass().getName();
	}

	public void reload() throws IOException {
		reloadConfig();
		configHandler.loadConfig();
		
		events.load();
	}

	/**
	 * Acquires a generator config that applies for the given player,
	 * The result depends on the permission or island level of the player.
	 * 
	 * @param offlinePlayer the offline player (Usually created using the UUID) 
	 * @param world			the skyblock world
	 * @return				the generator config
	 */
	public GeneratorConfig getGeneratorConfigForPlayer(OfflinePlayer offlinePlayer, String world) {
		
		GeneratorConfig gc = null;
		int id = 0;
		
		if (offlinePlayer == null) {
			gc = generatorConfigs.get(0);
			cacheOreGen(offlinePlayer.getUniqueId(), id);
		} else {
			int islandLevel = getLevel(offlinePlayer.getUniqueId(), world);
			if (offlinePlayer.isOnline()) {
				Player realP = offlinePlayer.getPlayer();

				if (this.getActiveWorlds().contains(realP.getWorld())) {
					for (GeneratorConfig gc2 : generatorConfigs) {
						if (gc2 == null) {
							continue;
						}
						if ((realP.hasPermission(gc2.permission) || gc2.permission.length() == 0)
								&& islandLevel >= gc2.unlock_islandLevel) {
							// continue
							gc = gc2;
							id++;
						}

					}
				}
			} else {
				gc = getCachedGeneratorConfig(offlinePlayer.getUniqueId());
			}
		}
		
		if (id > 0) {
			cacheOreGen(offlinePlayer.getUniqueId(), id - 1);
		}
		
		// fail over if there wasn't found any applicable generator but still no permission and level 0
		if (gc == null && generatorConfigs.get(0) != null 
				&& (generatorConfigs.get(0).permission == ";" || generatorConfigs.get(0).permission == "" || generatorConfigs.get(0).permission.length() == 0)
				&& generatorConfigs.get(0).unlock_islandLevel == 0) {
			
			gc = generatorConfigs.get(0);
		}
		
		return gc;
	}

	/**
	 * Returns all worlds in which the plugin is disabled in (configurable inside the config.yml)
	 * 
	 * @return A list of world names as string
	 */
	public List<String> getDisabledWorlds() {
		return disabledWorlds;
	}

	/**
	 * Returns a cached generator config. Useful when an island owner left the server, but a player is still mining at a generator.
	 * 
	 * @param uuid	the owners UUID
	 * @return		the generator config
	 */
	public GeneratorConfig getCachedGeneratorConfig(UUID uuid) {
		if (cachedOregenConfigs.containsKey(uuid)) {
			return generatorConfigs.get(cachedOregenConfigs.get(uuid));
		}
		return null;
	}

	/**
	 * Writes an existing ore generator config to the cache
	 * 
	 * @param uuid		UUID of the owner
	 * @param configID	the ID of the generator config
	 */
	public void cacheOreGen(UUID uuid, int configID) {
		cachedOregenConfigs.put(uuid, configID);
	}

	/**
	 * Sends a formatted messages to the console, colors supported
	 * 
	 * @param msg A string using either & or § for colors
	 */
	public void sendConsole(String msg) {
		clogger.sendMessage(PREFIX + msg.replace("&", "§"));
	}
	
	public List<GeneratorConfig> getGeneratorConfigs() {
		return generatorConfigs;
	}

	public void setGeneratorConfigs(List<GeneratorConfig> generatorConfigs) {
		this.generatorConfigs = generatorConfigs;
	}
	
	/**
	 * @return the skyblockAPICached
	 */
	public SkyblockAPICached getSkyblockAPICached() {
		return skyblockAPICached;
	}
}