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/*
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 *   Copyright 2011 Brian Rosenberger (Brutex Network)
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 *
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 *   Licensed under the Apache License, Version 2.0 (the "License");
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 *   you may not use this file except in compliance with the License.
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 *   You may obtain a copy of the License at
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 *
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 *       http://www.apache.org/licenses/LICENSE-2.0
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 *
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 *   Unless required by applicable law or agreed to in writing, software
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 *   distributed under the License is distributed on an "AS IS" BASIS,
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 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 *   See the License for the specific language governing permissions and
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 *   limitations under the License.
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 */
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package net.brutex.xservices.util;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileReader;
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import java.io.IOException;
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import java.sql.Connection;
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import java.sql.DatabaseMetaData;
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import java.sql.DriverManager;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.sql.Statement;
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import java.util.ArrayList;
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import java.util.List;
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import org.apache.log4j.Level;
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import org.apache.log4j.Logger;
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import org.quartz.utils.ConnectionProvider;
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/**
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 * @author Brian Rosenberger
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 *
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 */
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public class BrutexHSQLQuartzConnectionProvider implements ConnectionProvider {
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	private Connection conn = null;
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	private final Logger logger = Logger.getLogger(this.getClass().getCanonicalName());
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	public Connection getConnection() throws SQLException {
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		if( conn!= null && conn.isValid(5)) {
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			logger.debug("Checking tables on pre-exisiting database connection.");
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			checkTables();
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			return conn;
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		}
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		try {
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			// Class.forName("org.hsqldb.jdbc.JDBCDriver" );
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			Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
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		} catch (Exception e) {
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			logger.fatal("Failed to load Derby JDBC driver.");
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			e.printStackTrace();
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			return null;
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		}
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		if(isConnected(false)) {
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			checkTables();
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		} else {
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			return null;
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		}
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		return conn;
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	}
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	public void shutdown() throws SQLException {
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		try {
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			// Class.forName("org.hsqldb.jdbc.JDBCDriver" );
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			Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
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		} catch (Exception e) {
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			System.err.println("ERROR: failed to load Derby JDBC driver.");
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			e.printStackTrace();
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			return;
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		}
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		String t = this.getClass().getClassLoader().getResource("/").toString()
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				.substring(6);
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		t += "../data/db";
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		System.out.println("Shut down embedded database now.");
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		Connection c = DriverManager.getConnection("jdbc:derby:" + t
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				+ ";shutdown=true;");
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	}
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	private synchronized void recursiveDelete(File dbDir) {
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		File[] files = dbDir.listFiles();
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		for (int i = 0; i < files.length; i++) {
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			if (files[i].isFile()) {
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				files[i].delete();
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			} else {
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				recursiveDelete(files[i]);
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				files[i].delete();
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			}
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		}
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		dbDir.delete();
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	}
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	private synchronized void checkTables() throws SQLException {
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		logger.debug("Checking QUARTZ database schema.");
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		if(!isConnected(false)) {
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			logger.error("Failed to validate QUARTZ database schema.");
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			return;
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		}
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		List<String> ddl_list = new ArrayList<String>(11);
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		ddl_list.add("QRTZ_JOB_DETAILS");
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		ddl_list.add("QRTZ_TRIGGERS");
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		ddl_list.add("QRTZ_SIMPLE_TRIGGERS");
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		ddl_list.add("QRTZ_CRON_TRIGGERS");
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		ddl_list.add("QRTZ_SIMPROP_TRIGGERS");
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		ddl_list.add("QRTZ_BLOB_TRIGGERS");
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		ddl_list.add("QRTZ_CALENDARS");
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		ddl_list.add("QRTZ_PAUSED_TRIGGER_GRPS");
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		ddl_list.add("QRTZ_FIRED_TRIGGERS");
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		ddl_list.add("QRTZ_SCHEDULER_STATE");
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		ddl_list.add("QRTZ_LOCKS");
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		String ddl = this.getClass().getClassLoader().getResource("/").toString()
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		.substring(6)+ "../data/";
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		DatabaseMetaData dmd = conn.getMetaData();
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		for (String tbl : ddl_list) {
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			ResultSet rs = dmd.getTables(null, "APP", tbl, null);
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			if (!rs.next()) {
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				logger.log(Level.INFO, "Adding DDL for table "+ tbl);
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				Statement st = conn.createStatement();
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				File ddlFile = new File(ddl + tbl + ".ddl");
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				String create = "";
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				try {
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						BufferedReader r = new BufferedReader(new FileReader(ddlFile));
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						while (r.ready()) {
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							create += r.readLine() + "\n";
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						}
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						create.trim();
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						if( st.execute(create)) {
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							logger.log(Level.INFO, "Table " + tbl + " created.");
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						}
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					} catch (FileNotFoundException ex) {
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						ex.printStackTrace();
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					} catch (IOException ex) {
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						ex.printStackTrace();
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					} catch (SQLException ex) {
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						logger.log(Level.ERROR, "Error executing statement "+ create );
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						System.out.println(ex.getMessage());
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					}
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				} else {
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					logger.trace("Table "+tbl+" exists.");
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				}
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			}
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		}
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	private synchronized boolean isConnected(boolean fail) throws SQLException {
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		if(conn!=null && conn.isValid(5)) {
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			return true;
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		} else {
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			String t = this.getClass().getClassLoader().getResource("/").toString().substring(6); // WEB-INF/classes
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			t += "../data/db";
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			logger.debug("Database directory is set to '" + t + "'");
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			try {
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				this.conn = DriverManager.getConnection("jdbc:derby:" + t + ";create=true;");
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			} catch (SQLException ex) {
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				logger.error(ex.getMessage(), ex);
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				if(!fail) {
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					logger.warn("Deleting database directory.");
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					recursiveDelete(new File(t));
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					logger.warn("Retrying to connect to database.");
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					return isConnected(true);
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				} else {
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					return false;
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				}
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			}
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		}
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		return false;
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	}
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}
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