/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */

package net.sf.l2j.gameserver.instancemanager;

import java.io.File;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.xml.parsers.DocumentBuilderFactory;

import javolution.util.FastList;
import net.sf.l2j.Config;
import net.sf.l2j.L2DatabaseFactory;
import net.sf.l2j.gameserver.model.L2World;
import net.sf.l2j.gameserver.model.L2WorldRegion;
import net.sf.l2j.gameserver.model.zone.L2ZoneType;
import net.sf.l2j.gameserver.model.zone.form.*;
import net.sf.l2j.gameserver.model.zone.type.*;

import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

/**
 * This class manages the augmentation data and can also create new
 * augmentations.
 * 
 * @author durgus
 */
public class ZoneManager
{
	private static final Logger _log = Logger.getLogger(ZoneManager.class.getName());

	// =========================================================
	private static ZoneManager _instance;

	public static final ZoneManager getInstance()
	{
		if (_instance == null)
		{
			_instance = new ZoneManager();
		}
		return _instance;
	}

	// =========================================================
	// Data Field

	// =========================================================
	// Constructor
	private/*public*/ ZoneManager()
	{
		_log.info("Initializing ZoneManager");
		load();
	}

	public void reload()
	{
		// int zoneCount = 0;
		
		// Get the world regions
		int count = 0;
		L2WorldRegion[][] worldRegions = L2World.getInstance().getAllWorldRegions();
		for (int x = 0; x < worldRegions.length; x++)
		{
			for (int y = 0; y < worldRegions[x].length; y++)
			{
				worldRegions[x][y].getZones().clear();
				count++;
			}
		}
		GrandBossManager.getInstance().getZones().clear();
		_log.info("Removed zones in "+ count+ " regions.");
		// Load the zones
		load();
	}

	// =========================================================
	// Method - Private

	private final void load()
	{
		_log.info("Loading zones...");
		java.sql.Connection con = null;
		int zoneCount = 0;

		// Get the world regions
		L2WorldRegion[][] worldRegions = L2World.getInstance().getAllWorldRegions();

		// Load the zone xml
		try
		{
			// Get a sql connection here
			con = L2DatabaseFactory.getInstance().getConnection();

			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
			factory.setValidating(false);
			factory.setIgnoringComments(true);

			File file = new File(Config.DATAPACK_ROOT + "/data/zones/zone.xml");
			if (!file.exists())
			{
				if (Config.DEBUG)
					_log.info("The zone.xml file is missing.");
				return;
			}

			Document doc = factory.newDocumentBuilder().parse(file);

			for (Node n = doc.getFirstChild(); n != null; n = n.getNextSibling())
			{
				if ("list".equalsIgnoreCase(n.getNodeName()))
				{
					for (Node d = n.getFirstChild(); d != null; d = d.getNextSibling())
					{
						if ("zone".equalsIgnoreCase(d.getNodeName()))
						{
							NamedNodeMap attrs = d.getAttributes();
							int zoneId = Integer.parseInt(attrs.getNamedItem("id").getNodeValue());
							int minZ = Integer.parseInt(attrs.getNamedItem("minZ").getNodeValue());
							int maxZ = Integer.parseInt(attrs.getNamedItem("maxZ").getNodeValue());
							String zoneType = attrs.getNamedItem("type").getNodeValue();
							String zoneShape = attrs.getNamedItem("shape").getNodeValue();


							// Create the zone
							L2ZoneType temp = null;

							if (zoneType.equals("FishingZone"))
								temp = new L2FishingZone(zoneId);
							else if (zoneType.equals("ClanHallZone"))
								temp = new L2ClanHallZone(zoneId);
							else if (zoneType.equals("PeaceZone"))
								temp = new L2PeaceZone(zoneId);
							else if (zoneType.equals("Town"))
								temp = new L2TownZone(zoneId);
							else if (zoneType.equals("OlympiadStadium"))
								temp = new L2OlympiadStadiumZone(zoneId);
							else if (zoneType.equals("CastleZone"))
								temp = new L2CastleZone(zoneId);
							else if (zoneType.equals("CastleTeleportZone"))
								temp = new L2CastleTeleportZone(zoneId);
							else if (zoneType.equals("FortZone"))
								temp = new L2FortZone(zoneId);
							else if (zoneType.equals("DamageZone"))
								temp = new L2DamageZone(zoneId);
							else if (zoneType.equals("PoisonZone"))
								temp = new L2PoisonZone(zoneId);
							else if (zoneType.equals("SwampZone"))
								temp = new L2SwampZone(zoneId);
							else if (zoneType.equals("Arena"))
								temp = new L2ArenaZone(zoneId);
							else if (zoneType.equals("MotherTree"))
								temp = new L2MotherTreeZone(zoneId);
							else if (zoneType.equals("BigheadZone"))
								temp = new L2BigheadZone(zoneId);
							else if (zoneType.equals("NoLandingZone"))
								temp = new L2NoLandingZone(zoneId);
							else if (zoneType.equals("JailZone"))
								temp = new L2JailZone(zoneId);
							else if (zoneType.equals("DerbyTrackZone"))
								temp = new L2DerbyTrackZone(zoneId);
							else if (zoneType.equals("BossZone"))
								temp = new L2BossZone(zoneId);
							else if (zoneType.equals("WaterZone"))
								temp = new L2WaterZone(zoneId);

							// Check for unknown type
							if (temp == null)
							{
								_log.warning("ZoneData: No such zone type: "
								        + zoneType);
								continue;
							}

							// Get the zone shape from sql
							try
							{
								PreparedStatement statement = null;

								// Set the correct query
								statement = con.prepareStatement("SELECT x,y FROM zone_vertices WHERE id=? ORDER BY 'order' ASC ");

								statement.setInt(1, zoneId);
								ResultSet rset = statement.executeQuery();

								// Create this zone. Parsing for cuboids is a
								// bit different than for other polygons
								// cuboids need exactly 2 points to be defined.
								// Other polygons need at least 3 (one per
								// vertex)
								if (zoneShape.equalsIgnoreCase("Cuboid"))
								{
									int[] x = { 0, 0 };
									int[] y = { 0, 0 };
									boolean successfulLoad = true;

									for (int i = 0; i < 2; i++)
									{
										if (rset.next())
										{
											x[i] = rset.getInt("x");
											y[i] = rset.getInt("y");
										}
										else
										{
											_log.warning("ZoneData: Missing cuboid vertex in sql data for zone: "
											        + zoneId);
											rset.close();
											statement.close();
											successfulLoad = false;
											break;
										}
									}

									if (successfulLoad)
										temp.setZone(new ZoneCuboid(x[0], x[1], y[0], y[1], minZ, maxZ));
									else
										continue;
								}
								else if (zoneShape.equalsIgnoreCase("NPoly"))
								{
									FastList<Integer> fl_x = new FastList<Integer>(), fl_y = new FastList<Integer>();

									// Load the rest
									while (rset.next())
									{
										fl_x.add(rset.getInt("x"));
										fl_y.add(rset.getInt("y"));
									}

									// An nPoly needs to have at least 3
									// vertices
									if ((fl_x.size() == fl_y.size())
									        && (fl_x.size() > 2))
									{
										// Create arrays
										int[] aX = new int[fl_x.size()];
										int[] aY = new int[fl_y.size()];

										// This runs only at server startup so
										// dont complain :>
										for (int i = 0; i < fl_x.size(); i++)
										{
											aX[i] = fl_x.get(i);
											aY[i] = fl_y.get(i);
										}

										// Create the zone
										temp.setZone(new ZoneNPoly(aX, aY, minZ, maxZ));
									}
									else
									{
										_log.warning("ZoneData: Bad sql data for zone: "
										        + zoneId);
										rset.close();
										statement.close();
										continue;
									}
								}
								else if (zoneShape.equalsIgnoreCase("Cylinder"))
								{
									// A Cylinder zone requires a centre point
									// at x,y and a radius
									int zoneRad = Integer.parseInt(attrs.getNamedItem("rad").getNodeValue());
									if (rset.next() && zoneRad > 0)
									{
										int zoneX = rset.getInt("x");
										int zoneY = rset.getInt("y");

										// create the zone
										temp.setZone(new ZoneCylinder(zoneX, zoneY, minZ, maxZ, zoneRad));
									}
									else
									{
										_log.warning("ZoneData: Bad sql data for zone: "
										        + zoneId);
										rset.close();
										statement.close();
										continue;
									}
								}
								else
								{
									_log.warning("ZoneData: Unknown shape: "
									        + zoneShape);
									rset.close();
									statement.close();
									continue;
								}
								
								rset.close();
								statement.close();
							}
							catch (Exception e)
							{
								_log.warning("ZoneData: Failed to load zone coordinates: "
								        + e);
							}

							// Check for aditional parameters
							for (Node cd = d.getFirstChild(); cd != null; cd = cd.getNextSibling())
							{
								if ("stat".equalsIgnoreCase(cd.getNodeName()))
								{
									attrs = cd.getAttributes();
									String name = attrs.getNamedItem("name").getNodeValue();
									String val = attrs.getNamedItem("val").getNodeValue();
									
									temp.setParameter(name, val);
								}
							}

							// Skip checks for fishing zones & add to fishing
							// zone manager
							if (temp instanceof L2FishingZone)
							{
								FishingZoneManager.getInstance().addFishingZone((L2FishingZone) temp);
								continue;
							}
							if (temp instanceof L2WaterZone)
							{
								FishingZoneManager.getInstance().addWaterZone((L2WaterZone) temp);
							}
							// Register the zone into any world region it
							// intersects with...
							// currently 11136 test for each zone :>
							int ax, ay, bx, by;
							for (int x = 0; x < worldRegions.length; x++)
							{
								for (int y = 0; y < worldRegions[x].length; y++)
								{
									ax = (x - L2World.OFFSET_X) << L2World.SHIFT_BY;
									bx = ((x + 1) - L2World.OFFSET_X) << L2World.SHIFT_BY;
									ay = (y - L2World.OFFSET_Y) << L2World.SHIFT_BY;
									by = ((y + 1) - L2World.OFFSET_Y) << L2World.SHIFT_BY;
									
									if (temp.getZone().intersectsRectangle(ax, bx, ay, by))
									{
										if (Config.DEBUG)
										{
											_log.info("Zone (" + zoneId
											        + ") added to: " + x + " "
											        + y);
										}
										worldRegions[x][y].addZone(temp);
									}
								}
							}

							// Special managers for arenas, towns...
							if (temp instanceof L2ArenaZone)
								ArenaManager.getInstance().addArena((L2ArenaZone) temp);
							else if (temp instanceof L2TownZone)
								TownManager.getInstance().addTown((L2TownZone) temp);
							else if (temp instanceof L2OlympiadStadiumZone)
								OlympiadStadiaManager.getInstance().addStadium((L2OlympiadStadiumZone) temp);
							else if (temp instanceof L2BossZone)
								GrandBossManager.getInstance().addZone((L2BossZone) temp);

							// Increase the counter
							zoneCount++;
						}
					}
				}
			}
		}
		catch (Exception e)
		{
			_log.log(Level.SEVERE, "Error while loading zones.", e);
			return;
		}
		finally
		{
			try
			{
				con.close();
			}
			catch (Exception e)
			{
			}
		}

		GrandBossManager.getInstance().initZones();
		
		_log.info("Done: loaded " + zoneCount + " zones.");
	}
}