package com.gpl.rpg.atcontentstudio.model.maps;

import java.awt.Image;
import java.io.File;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardWatchEventKinds;
import java.nio.file.WatchEvent;
import java.nio.file.WatchKey;
import java.nio.file.WatchService;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Enumeration;
import java.util.List;

import javax.swing.tree.TreeNode;

import com.gpl.rpg.atcontentstudio.Notification;
import com.gpl.rpg.atcontentstudio.model.GameSource;
import com.gpl.rpg.atcontentstudio.model.GameSource.Type;
import com.gpl.rpg.atcontentstudio.model.Project;
import com.gpl.rpg.atcontentstudio.model.Project.ResourceSet;
import com.gpl.rpg.atcontentstudio.model.ProjectTreeNode;
import com.gpl.rpg.atcontentstudio.model.gamedata.GameDataSet;
import com.gpl.rpg.atcontentstudio.ui.DefaultIcons;
import com.gpl.rpg.atcontentstudio.utils.FileUtils;

public class TMXMapSet implements ProjectTreeNode {

	public static final String DEFAULT_REL_PATH_IN_SOURCE = "res"+File.separator+"xml"+File.separator;
	public static final String DEFAULT_REL_PATH_IN_PROJECT = "maps"+File.separator;
	public static final String DEFAULT_REL_PATH_TO_DRAWABLE = ".."+File.separator+"drawable"+File.separator;

	public static final String GAME_MAPS_ARRAY_NAME = "loadresource_maps";
	public static final String DEBUG_SUFFIX = "_debug";
	public static final String RESOURCE_PREFIX = "@xml/";
	public static final String FILENAME_SUFFIX = ".tmx";
	
	public File mapFolder = null;
	public List<TMXMap> tmxMaps;
	
	public ProjectTreeNode parent;
	
	public TMXMapSet(GameSource source) {
		this.parent = source;
		if (source.type == GameSource.Type.source) {
			this.mapFolder = new File(source.baseFolder, DEFAULT_REL_PATH_IN_SOURCE);
		}
		else if (source.type == GameSource.Type.created | source.type == GameSource.Type.altered) {
			this.mapFolder = new File(source.baseFolder, DEFAULT_REL_PATH_IN_PROJECT);
			if (!this.mapFolder.exists()) {
				this.mapFolder.mkdirs();
			}
			FileUtils.makeSymlink(getProject().baseContent.gameSprites.drawableFolder, new File(mapFolder.getAbsolutePath()+File.separator+DEFAULT_REL_PATH_TO_DRAWABLE));
		}
		this.tmxMaps = new ArrayList<TMXMap>();
		
		if (source.type == GameSource.Type.source && (source.parent.sourceSetToUse == ResourceSet.debugData || source.parent.sourceSetToUse == ResourceSet.gameData)) {
			String suffix = (source.parent.sourceSetToUse == ResourceSet.debugData) ? DEBUG_SUFFIX : "";
			
			if (source.referencedSourceFiles.get(GAME_MAPS_ARRAY_NAME+suffix) != null) {
				for (String resource : source.referencedSourceFiles.get(GAME_MAPS_ARRAY_NAME+suffix)) {
					File f = new File(mapFolder, resource.replaceAll(RESOURCE_PREFIX, "")+FILENAME_SUFFIX);
					if (f.exists()) {
						TMXMap map = new TMXMap(this, f);
						tmxMaps.add(map);
					} else {
						Notification.addWarn("Unable to locate resource "+resource+" in the game source for project "+getProject().name);
					}
				}
			}
		
		} else if (this.mapFolder != null) {
			for (File f : this.mapFolder.listFiles()) {
				if (f.getName().endsWith(".tmx") || f.getName().endsWith(".TMX")) {
					TMXMap map = new TMXMap(this, f);
					if (source.type == GameSource.Type.created | source.type == GameSource.Type.altered) {
						map.writable = true;
					}
					tmxMaps.add(map);
				}
			}
		}
		Collections.sort(tmxMaps, new Comparator<TMXMap>() {
			@Override
			public int compare(TMXMap o1, TMXMap o2) {
				return o1.id.compareTo(o2.id);
			}
		});
		if (source.type == GameSource.Type.created | source.type == GameSource.Type.altered) {
			final Path folderPath = Paths.get(mapFolder.getAbsolutePath());
			Thread watcher = new Thread("Map folder watcher for "+getProject().name+"/"+source.type) {
				public void run() {
					WatchService watchService;

					while(getProject().open) {
						try {
							watchService = FileSystems.getDefault().newWatchService();
							/*WatchKey watchKey = */folderPath.register(watchService, StandardWatchEventKinds.ENTRY_MODIFY);
							WatchKey wk;
							validService: while(getProject().open) {
								wk = watchService.take();
								for (WatchEvent<?> event : wk.pollEvents()) {
									Path changed = (Path) event.context();
									String name = changed.getFileName().toString();
									String id = name.substring(0, name.length() - 4);
									TMXMap map = getMap(id);
									if (map != null) {
										map.mapChangedOnDisk();
									}
								}
								if(!wk.reset()) {
									watchService.close();
									break validService;
								}
							}
						} catch (IOException e) {
							e.printStackTrace();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
				};
			};
			watcher.start();
		}
	}
	
	@Override
	public Enumeration<TMXMap> children() {
		return Collections.enumeration(tmxMaps);
	}
	@Override
	public boolean getAllowsChildren() {
		return true;
	}
	@Override
	public TreeNode getChildAt(int arg0) {
		return tmxMaps.get(arg0);
	}
	@Override
	public int getChildCount() {
		return tmxMaps.size();
	}
	@Override
	public int getIndex(TreeNode arg0) {
		return tmxMaps.indexOf(arg0);
	}
	@Override
	public TreeNode getParent() {
		return parent;
	}
	@Override
	public boolean isLeaf() {
		return false;
	}
	@Override
	public void childrenAdded(List<ProjectTreeNode> path) {
		path.add(0, this);
		parent.childrenAdded(path);
	}
	@Override
	public void childrenChanged(List<ProjectTreeNode> path) {
		path.add(0, this);
		parent.childrenChanged(path);
	}
	@Override
	public void childrenRemoved(List<ProjectTreeNode> path) {
		if (path.size() == 1 && this.getChildCount() == 1) {
			childrenRemoved(new ArrayList<ProjectTreeNode>());
		} else {
			path.add(0, this);
			parent.childrenRemoved(path);
		}
	}
	@Override
	public void notifyCreated() {
		childrenAdded(new ArrayList<ProjectTreeNode>());
		for (TMXMap map : tmxMaps) {
			map.notifyCreated();
		}
	}
	@Override
	public String getDesc() {
		return (needsSaving() ? "*" : "")+"TMX Maps";
	}
	
	@Override
	public Project getProject() {
		return parent.getProject();
	}
	

	@Override
	public Image getIcon() {
		return getOpenIcon();
	}
	@Override
	public Image getClosedIcon() {
		return DefaultIcons.getTmxClosedIcon();
	}
	@Override
	public Image getLeafIcon() {
		return DefaultIcons.getTmxClosedIcon();
	}
	@Override
	public Image getOpenIcon() {
		return DefaultIcons.getTmxOpenIcon();
	}
	
	@Override
	public GameDataSet getDataSet() {
		return null;
	}
	
	@Override
	public Type getDataType() {
		return parent.getDataType();
	}
	
	@Override
	public boolean isEmpty() {
		return tmxMaps.isEmpty();
	}

	public TMXMap getMap(String id) {
		if (tmxMaps == null) return null;
		for (TMXMap map : tmxMaps) {
			if (id.equals(map.id)){
				return map;
			}
		}
		return null;
	}

	public void addMap(TMXMap node) {
		ProjectTreeNode higherEmptyParent = this;
		while (higherEmptyParent != null) {
			if (higherEmptyParent.getParent() != null && ((ProjectTreeNode)higherEmptyParent.getParent()).isEmpty()) higherEmptyParent = (ProjectTreeNode)higherEmptyParent.getParent();
			else break;
		}
		if (higherEmptyParent == this && !this.isEmpty()) higherEmptyParent = null;
		tmxMaps.add(node);
		if (node.tmxFile != null) {
			//Altered node.
			node.tmxFile = new File(this.mapFolder, node.tmxFile.getName());
		} else {
			//Created node.
			node.tmxFile = new File(this.mapFolder, node.id+".tmx");
		}
		node.parent = this;
		if (higherEmptyParent != null) higherEmptyParent.notifyCreated();
		else node.notifyCreated();
	}

	public TMXMap get(int index) {
		return tmxMaps.get(index);
	}
	
	@Override
	public boolean needsSaving() {
		for (ProjectTreeNode node : tmxMaps) {
			if (node.needsSaving()) return true;
		}
		return false;
	}
	
}