package net.oni2.aeinstaller.backend.depot;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.UnknownHostException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Vector;

import net.oni2.aeinstaller.backend.Settings;
import net.oni2.aeinstaller.backend.Settings.Platform;
import net.oni2.aeinstaller.backend.depot.model.File;
import net.oni2.aeinstaller.backend.depot.model.Node;
import net.oni2.aeinstaller.backend.depot.model.NodeField_Body;
import net.oni2.aeinstaller.backend.depot.model.NodeField_Upload;
import net.oni2.aeinstaller.backend.depot.model.NodeMod;
import net.oni2.aeinstaller.backend.depot.model.TaxonomyTerm;
import net.oni2.aeinstaller.backend.depot.model.TaxonomyVocabulary;
import net.oni2.aeinstaller.backend.mods.ECompatiblePlatform;
import net.oni2.aeinstaller.backend.network.DrupalJSONQuery;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.StaxDriver;

/**
 * @author Christian Illy
 */
public class DepotManager {
	private static DepotManager instance = new DepotManager();

	private HashMap<Integer, TaxonomyVocabulary> taxonomyVocabulary = new HashMap<Integer, TaxonomyVocabulary>();
	private HashMap<Integer, TaxonomyTerm> taxonomyTerms = new HashMap<Integer, TaxonomyTerm>();

	private HashMap<Integer, Node> nodes = new HashMap<Integer, Node>();
	private HashMap<String, HashMap<Integer, Node>> nodesByType = new HashMap<String, HashMap<Integer, Node>>();

	private HashMap<Integer, File> files = new HashMap<Integer, File>();

	private int vocabId_type = -1;
	private int vocabId_platform = -1;
	private int vocabId_instmethod = -1;

	/**
	 * @return Singleton instance
	 */
	public static DepotManager getInstance() {
		return instance;
	}

	/**
	 * Update local Depot information cache
	 * 
	 * @param forceRefreshAll
	 *            Force refreshing all data, even if it seems to be cached
	 * @param listener
	 *            Listener for update status
	 */
	public void updateInformation(boolean forceRefreshAll,
			DepotCacheUpdateProgressListener listener) {
		taxonomyTerms.clear();
		taxonomyVocabulary.clear();

		HashMap<Integer, Node> oldNodes = null;
		HashMap<Integer, File> oldFiles = null;

		if (forceRefreshAll) {
			oldNodes = new HashMap<Integer, Node>();
			oldFiles = new HashMap<Integer, File>();
		} else {
			oldNodes = nodes;
			oldFiles = files;
		}

		nodes = new HashMap<Integer, Node>();
		nodesByType = new HashMap<String, HashMap<Integer, Node>>();
		files = new HashMap<Integer, File>();

		try {
			JSONArray ja;
			JSONObject jo;
			int page;

			// Get taxonomy vocabulary
			if (listener != null)
				listener.cacheUpdateProgress("Updating taxonomy vocabulary", 0,
						100);
			page = 0;
			do {
				ja = DrupalJSONQuery.getIndex("taxonomy_vocabulary", page, 100);
				for (int i = 0; i < ja.length(); i++) {
					jo = ja.getJSONObject(i);
					TaxonomyVocabulary tv = new TaxonomyVocabulary(jo);
					taxonomyVocabulary.put(tv.getVid(), tv);
				}
				page++;
			} while (ja.length() > 0);

			// Get taxonomy terms
			if (listener != null)
				listener.cacheUpdateProgress("Updating taxonomy terms", 0, 100);
			page = 0;
			do {
				ja = DrupalJSONQuery.getIndex("taxonomy_term", page, 100);
				for (int i = 0; i < ja.length(); i++) {
					jo = ja.getJSONObject(i);
					TaxonomyTerm tt = new TaxonomyTerm(jo);
					taxonomyTerms.put(tt.getTid(), tt);
				}
				page++;
			} while (ja.length() > 0);

			// Check nodes for new information
			if (listener != null)
				listener.cacheUpdateProgress("Checking for new/updated nodes",
						1, 100);
			HashSet<Integer> nodesToUpdate = new HashSet<Integer>();
			page = 0;
			do {
				ja = DrupalJSONQuery.getIndex("node", page, 500);
				for (int i = 0; i < ja.length(); i++) {
					jo = ja.getJSONObject(i);
					int nid = jo.getInt("nid");
					long changedRemote = jo.getLong("changed");
					if (oldNodes.containsKey(nid)) {
						if (changedRemote > oldNodes.get(nid).getChanged())
							nodesToUpdate.add(nid);
						else {
							Node n = oldNodes.get(nid);
							nodes.put(nid, n);
							if (!nodesByType.containsKey(n.getType()))
								nodesByType.put(n.getType(),
										new HashMap<Integer, Node>());
							nodesByType.get(n.getType()).put(nid, n);
						}
					} else {
						nodesToUpdate.add(nid);
					}
				}
				page++;
			} while (ja.length() > 0);

			// Check files for new stuff
			if (listener != null)
				listener.cacheUpdateProgress("Checking for new/updated files",
						2, 100);
			HashSet<Integer> filesToUpdate = new HashSet<Integer>();
			page = 0;
			do {
				ja = DrupalJSONQuery.getIndex("file", page, 500);
				for (int i = 0; i < ja.length(); i++) {
					jo = ja.getJSONObject(i);
					int fid = jo.getInt("fid");
					long changedRemote = jo.getLong("timestamp");
					if (oldFiles.containsKey(fid)) {
						if (changedRemote > oldFiles.get(fid).getTimestamp())
							filesToUpdate.add(fid);
						else
							files.put(fid, oldFiles.get(fid));
					} else {
						filesToUpdate.add(fid);
					}
				}
				page++;
			} while (ja.length() > 0);

			int total = nodesToUpdate.size() + filesToUpdate.size() + 3;
			int step = 3;
			// Update nodes with new information
			for (int nid : nodesToUpdate) {
				if (listener != null)
					listener.cacheUpdateProgress("Updating nodes", step++,
							total);

				ja = DrupalJSONQuery.getItem("node", nid, "");
				jo = ja.getJSONObject(0);
				String type = jo.getString("type");

				Node n = null;
				if (type.equalsIgnoreCase(DepotConfig.getNodeType_Mod()))
					n = new NodeMod(jo);
				else
					n = new Node(jo);

				nodes.put(nid, n);
				if (!nodesByType.containsKey(type))
					nodesByType.put(type, new HashMap<Integer, Node>());
				nodesByType.get(type).put(nid, n);
			}

			// Update new files
			for (int fid : filesToUpdate) {
				if (listener != null)
					listener.cacheUpdateProgress("Updating files", step++,
							total);

				ja = DrupalJSONQuery.getItem("file", fid, "&file_contents=0");
				jo = ja.getJSONObject(0);

				File f = new File(jo);
				files.put(fid, f);
			}

			vocabId_type = getVocabulary(
					DepotConfig.getVocabularyName_ModType()).getVid();
			vocabId_platform = getVocabulary(
					DepotConfig.getVocabularyName_Platform()).getVid();
			vocabId_instmethod = getVocabulary(
					DepotConfig.getVocabularyName_InstallType()).getVid();
		} catch (JSONException e) {
			e.printStackTrace();
		} catch (Exception e) {
			System.err.println(e.getMessage());
			e.printStackTrace();
		}
	}

	/**
	 * @return Can we connect to the Depot?
	 */
	public boolean checkConnection() {
		HttpRequestBase httpQuery = null;

		try {
			DefaultHttpClient httpclient = new DefaultHttpClient();
			httpQuery = new HttpGet(DepotConfig.getDepotUrl());

			HttpResponse response = httpclient.execute(httpQuery);

			int code = response.getStatusLine().getStatusCode();

			return (code >= 200) && (code <= 299);
		} catch (UnknownHostException e) {
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (httpQuery != null)
				httpQuery.releaseConnection();
		}
		return false;
	}

	/**
	 * @return All TaxVocabs
	 */
	public Vector<TaxonomyVocabulary> getVocabulary() {
		return new Vector<TaxonomyVocabulary>(taxonomyVocabulary.values());
	}

	/**
	 * @param id
	 *            Get taxonomy vocabulary by given ID
	 * @return TaxVocab
	 */
	public TaxonomyVocabulary getVocabulary(int id) {
		return taxonomyVocabulary.get(id);
	}

	/**
	 * @param name
	 *            Get taxonomy vocabulary by given name
	 * @return TaxVocab
	 */
	public TaxonomyVocabulary getVocabulary(String name) {
		for (TaxonomyVocabulary v : taxonomyVocabulary.values()) {
			if (v.getName().equalsIgnoreCase(name))
				return v;
		}
		return null;
	}

	/**
	 * @param vocabId
	 *            Get all taxonomy terms of a given vocabulary
	 * @return TaxTerms
	 */
	public Vector<TaxonomyTerm> getTaxonomyTermsByVocabulary(int vocabId) {
		Vector<TaxonomyTerm> res = new Vector<TaxonomyTerm>();
		for (TaxonomyTerm t : taxonomyTerms.values()) {
			if (t.getVid() == vocabId)
				res.add(t);
		}
		return res;
	}

	/**
	 * @param id
	 *            Get taxonomy term by given ID
	 * @return TaxTerm
	 */
	public TaxonomyTerm getTaxonomyTerm(int id) {
		return taxonomyTerms.get(id);
	}

	/**
	 * @param name
	 *            Get taxonomy term by given name
	 * @return TaxTerm
	 */
	public TaxonomyTerm getTaxonomyTerm(String name) {
		for (TaxonomyTerm t : taxonomyTerms.values()) {
			if (t.getName().equalsIgnoreCase(name))
				return t;
		}
		return null;
	}

	/**
	 * Get all nodes of given node type
	 * 
	 * @param nodeType
	 *            Node type
	 * @return Nodes of type nodeType
	 */
	public Vector<Node> getNodesByType(String nodeType) {
		return new Vector<Node>(nodesByType.get(nodeType).values());
	}

	/**
	 * Get a node by node id
	 * 
	 * @param id
	 *            Node id
	 * @return Node
	 */
	public Node getNodeById(int id) {
		return nodes.get(id);
	}

	/**
	 * Get a Mod-Node by a given package number
	 * 
	 * @param packageNumber
	 *            Package number to find
	 * @return The Mod-Node or null
	 */
	public NodeMod getNodeByPackageNumber(int packageNumber) {
		Vector<Node> files = getNodesByType(DepotConfig.getNodeType_Mod());
		for (Node n : files) {
			if (n instanceof NodeMod) {
				NodeMod nm = (NodeMod) n;
				if (nm.getPackageNumber() == packageNumber)
					return nm;
			}
		}
		return null;
	}

	/**
	 * @return Mod-Nodes
	 */
	public Vector<NodeMod> getModPackageNodes() {
		Vector<NodeMod> result = new Vector<NodeMod>();
		String instMethName = DepotConfig.getTaxonomyName_InstallType_Package();

		Vector<Node> files = getNodesByType(DepotConfig.getNodeType_Mod());
		for (Node n : files) {
			if (n instanceof NodeMod) {
				NodeMod nm = (NodeMod) n;
				if (nm.getInstallMethod().getName()
						.equalsIgnoreCase(instMethName))
					result.add(nm);
			}
		}
		return result;
	}

	/**
	 * @param node
	 *            Node to check validity on
	 * @param platform
	 *            Platform to check against
	 * @return True if valid on platform
	 */
	public boolean isModValidOnPlatform(NodeMod node, Settings.Platform platform) {
		ECompatiblePlatform plat = node.getPlatform();
		switch (plat) {
			case BOTH:
				return true;
			case WIN:
				return (platform == Platform.WIN)
						|| (platform == Platform.LINUX);
			case MACOS:
				return (platform == Platform.MACOS);
		}
		return false;
	}

	/**
	 * Checks if the given mod-node is of the given mod-type(s)
	 * 
	 * @param node
	 *            Node to check
	 * @param type
	 *            Type(s) to check
	 * @param or
	 *            If false check if all given types are included in node. If
	 *            true checks if either of the given types is included.
	 * @return True if of given type(s)
	 */
	public boolean isModOfType(NodeMod node, HashSet<Integer> type, boolean or) {
		boolean matching = !or;
		HashSet<TaxonomyTerm> terms = node.getTypes();

		for (int t : type) {
			if (or)
				matching |= terms.contains(t);
			else
				matching &= terms.contains(t);
		}
		return matching;
	}

	/**
	 * @return VocabId of Platform vocabulary
	 */
	public int getVocabIdPlatform() {
		return vocabId_platform;
	}

	/**
	 * @return VocabId of Install method vocabulary
	 */
	public int getVocabIdInstMethod() {
		return vocabId_instmethod;
	}

	/**
	 * @return VocabId of Type vocabulary
	 */
	public int getVocabIdType() {
		return vocabId_type;
	}

	/**
	 * @param id
	 *            ID of file to get
	 * @return the file
	 */
	public File getFile(int id) {
		return files.get(id);
	}

	/**
	 * Print stats about nodes and files
	 */
	public void printStats() {
		System.out.println("Nodes by type:");
		for (String t : nodesByType.keySet()) {
			System.out.println("  " + t + ": " + nodesByType.get(t).size());
		}

		System.out.println("Files: " + files.size());
	}

	private XStream getXStream() {
		XStream xs = new XStream(new StaxDriver());
		xs.alias("Depot", DepotManager.class);
		xs.alias("File", net.oni2.aeinstaller.backend.depot.model.File.class);
		xs.alias("Node", Node.class);
		xs.alias("NodeField_Body", NodeField_Body.class);
		xs.alias("NodeField_Upload", NodeField_Upload.class);
		xs.alias("NodeMod", NodeMod.class);
		xs.alias("TaxonomyTerm", TaxonomyTerm.class);
		xs.alias("TaxonomyVocabulary", TaxonomyVocabulary.class);
		return xs;
	}

	/**
	 * Save Depot cache instance to file
	 * 
	 * @param f
	 *            File to write to
	 */
	public void saveToFile(java.io.File f) {
		try {
			FileOutputStream fos = new FileOutputStream(f);
			XStream xs = getXStream();
			xs.toXML(this, fos);
			fos.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * Load Depot cache instance from file
	 * 
	 * @param f
	 *            File to read from
	 */
	public void loadFromFile(java.io.File f) {
		try {
			FileInputStream fis = new FileInputStream(f);
			XStream xs = getXStream();
			Object obj = xs.fromXML(fis);
			if (obj instanceof DepotManager)
				instance = (DepotManager) obj;
			fis.close();
		} catch (FileNotFoundException e) {
		} catch (IOException e) {
		}
	}
}