package com.massivecraft.factions;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.sk89q.worldguard.bukkit.WorldGuardPlugin;
import com.sk89q.worldguard.protection.managers.RegionManager;
import com.sk89q.worldguard.protection.ApplicableRegionSet;
import com.sk89q.worldguard.protection.UnsupportedIntersectionException;
import com.sk89q.worldguard.protection.regions.ProtectedCuboidRegion;
import com.sk89q.worldguard.protection.regions.ProtectedRegion;
import static com.sk89q.worldguard.bukkit.BukkitUtil.*;
import com.sk89q.worldguard.protection.flags.DefaultFlag;

import com.sk89q.worldedit.Vector;
import com.sk89q.worldedit.BlockVector;

import org.bukkit.World;
import org.bukkit.Chunk;
import org.bukkit.Location;
import org.bukkit.plugin.Plugin;
import org.bukkit.entity.Player;

/*
 *  Worldguard Region Checking
 *  Author: Spathizilla
 */

public class Worldguard {
	private static WorldGuardPlugin wg;
	private static boolean enabled = false;

	public static void init(Plugin plugin) {
		Plugin wgplug = plugin.getServer().getPluginManager().getPlugin("WorldGuard");
		if (wgplug == null || !(wgplug instanceof WorldGuardPlugin)) {
			enabled = false;
			wg = null;
			Factions.log("Could not hook to WorldGuard. WorldGuard checks are disabled.");
		} else {
			wg = (WorldGuardPlugin) wgplug;
			enabled = true;
			Factions.log("Successfully hooked to WorldGuard.");
		}
	}

	public static boolean isEnabled() {
		return enabled;
	}

	// PVP Flag check 
	// Returns:
	//   True: PVP is allowed
	//   False: PVP is disallowed
	public static boolean isPVP(Player player) {
		if(!enabled) {
			// No WG hooks so we'll always bypass this check.
			return true;
		}

		Location loc = player.getLocation();
		World world = loc.getWorld();
		Vector pt = toVector(loc);

		RegionManager regionManager = wg.getRegionManager(world);
		ApplicableRegionSet set = regionManager.getApplicableRegions(pt);
		return set.allows(DefaultFlag.PVP);
	}

	// Check for Regions in chunk the chunk
	// Returns:
	//   True: Regions found within chunk
	//   False: No regions found within chunk
	public static boolean checkForRegionsInChunk(Location loc) {
		if(!enabled) {
			// No WG hooks so we'll always bypass this check.
			return false;
		}

		World world = loc.getWorld();
		Chunk chunk = world.getChunkAt(loc);
		int minChunkX = chunk.getX() << 4;
		int minChunkZ = chunk.getZ() << 4;
		int maxChunkX = minChunkX + 15;
		int maxChunkZ = minChunkZ + 15;

		int worldHeight = world.getMaxHeight(); // Allow for heights other than default

		BlockVector minChunk = new BlockVector(minChunkX, 0, minChunkZ);
		BlockVector maxChunk = new BlockVector(maxChunkX, worldHeight, maxChunkZ);

		RegionManager regionManager = wg.getRegionManager(world);
		ProtectedCuboidRegion region = new ProtectedCuboidRegion("wgfactionoverlapcheck", minChunk, maxChunk);
		Map<String, ProtectedRegion> allregions = regionManager.getRegions(); 
		List<ProtectedRegion> allregionslist = new ArrayList<ProtectedRegion>(allregions.values());
		List<ProtectedRegion> overlaps;
		boolean foundregions = false;

		try {
			overlaps = region.getIntersectingRegions(allregionslist);
			if(overlaps == null || overlaps.isEmpty()) {
				foundregions = false;
			} else {
				foundregions = true;
			}
		} catch (UnsupportedIntersectionException e) {
			e.printStackTrace();
		}

		region = null;
		allregionslist = null;
		overlaps = null;

		return foundregions;
	}
}