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package org.rapidoid.jdbc;

import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.commons.Err;
import org.rapidoid.config.Conf;
import org.rapidoid.config.Config;
import org.rapidoid.datamodel.Results;
import org.rapidoid.datamodel.impl.ResultsImpl;
import org.rapidoid.group.AutoManageable;
import org.rapidoid.io.Res;
import org.rapidoid.log.Log;
import org.rapidoid.u.U;
import org.rapidoid.util.Msc;

import java.sql.*;
import java.util.List;
import java.util.Map;

/*
 * #%L
 * rapidoid-sql
 * %%
 * Copyright (C) 2014 - 2017 Nikolche Mihajlovski and contributors
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

@Authors("Nikolche Mihajlovski")
@Since("3.0.0")
public class JdbcClient extends AutoManageable {

	private volatile boolean initialized;

	private volatile String username;
	private volatile String password;
	private volatile String driver;
	private volatile String url;

	private volatile boolean usePool = true;
	private volatile ConnectionPool pool;

	private volatile ReadWriteMode mode = ReadWriteMode.READ_WRITE;

	private final Config config;

	public JdbcClient(String name) {
		super(name);

		this.config = Conf.JDBC.defaultOrCustom(name);

		configure();
	}

	public void configure() {
		url(config.entry("url").str().getOrNull());
		username(config.entry("username").str().getOrNull());
		password(config.entry("password").str().getOrNull());
		driver(config.entry("driver").str().getOrNull());

		if (U.isEmpty(driver) && U.notEmpty(url)) {
			driver(inferDriverFromUrl(url));
		}
	}

	public static String inferDriverFromUrl(String url) {
		if (url.startsWith("jdbc:mysql:")) {
			return "com.mysql.jdbc.Driver";
		} else if (url.startsWith("jdbc:h2:")) {
			return "org.hibernate.dialect.H2Dialect";
		} else if (url.startsWith("jdbc:hsqldb:")) {
			return "org.hsqldb.jdbc.JDBCDriver";
		}

		return null;
	}

	public synchronized JdbcClient username(String username) {
		if (U.neq(this.username, username)) {
			this.username = username;
			this.initialized = false;
		}
		return this;
	}

	public synchronized JdbcClient password(String password) {
		if (U.neq(this.password, password)) {
			this.password = password;
			this.initialized = false;
		}
		return this;
	}

	public synchronized JdbcClient driver(String driver) {
		if (U.neq(this.driver, driver)) {
			this.driver = driver;
			this.initialized = false;
		}
		return this;
	}

	public synchronized JdbcClient pool(ConnectionPool pool) {
		if (U.neq(this.pool, pool)) {
			this.pool = pool;
			this.usePool = pool != null;
			this.initialized = false;
		}
		return this;
	}

	public synchronized JdbcClient url(String url) {
		if (U.neq(this.url, url)) {
			this.url = url;
			this.initialized = false;
		}
		return this;
	}

	public synchronized JdbcClient usePool(boolean usePool) {
		if (U.neq(this.usePool, usePool)) {
			this.usePool = usePool;
			this.initialized = false;
		}
		return this;
	}

	public synchronized JdbcClient mode(ReadWriteMode mode) {
		if (U.neq(this.mode, mode)) {
			this.mode = mode;
			this.initialized = false;
		}
		return this;
	}

	/**
	 * Use usePool(true) instead.
	 */
	@Deprecated
	public JdbcClient pooled() {
		usePool(true);
		return this;
	}

	public JdbcClient mysql(String host, int port, String databaseName) {
		return driver("com.mysql.jdbc.Driver").url(U.frmt("jdbc:mysql://%s:%s/%s", host, port, databaseName));
	}

	public JdbcClient h2(String databaseName) {
		return driver("org.h2.Driver").url("jdbc:h2:mem:" + databaseName + ";DB_CLOSE_DELAY=-1").username("sa").password("");
	}

	public JdbcClient hsql(String databaseName) {
		return driver("org.hsqldb.jdbc.JDBCDriver").url("jdbc:hsqldb:mem:" + databaseName).username("sa").password("");
	}

	private void registerJDBCDriver() {
		if (driver == null && url != null) {
			driver = inferDriverFromUrl(url);
		}

		validateArgNotNull("driver", driver);

		try {
			Class.forName(driver);
		} catch (ClassNotFoundException e) {
			throw U.rte("Cannot find JDBC driver class: " + driver);
		}
	}

	private void validateArgNotNull(String argName, String argValue) {
		if (argValue == null) {
			throw U.rte("The JDBC parameter '" + argName + "' must be configured!");
		}
	}

	private synchronized void ensureIsInitialized() {
		if (!initialized) {
			validate();
			registerJDBCDriver();

			String maskedPassword = U.isEmpty(password) ? "" : "";
			Log.info("Initialized JDBC API", "!url", url, "!driver", driver, "!username", username, "!password", maskedPassword);

			if (pool == null) {
				pool = usePool ? new C3P0ConnectionPool(this) : new NoConnectionPool();
			}

			initialized = true;
		}
	}

	private void validate() {
		U.must(U.notEmpty(username != null), "The database username must be specified!");
		U.must(U.notEmpty(password != null), "The database password must be specified!");
		U.must(U.notEmpty(url != null), "The database connection URL must be specified!");
		U.must(U.notEmpty(driver != null), "The database driver must be specified!");
	}

	public Connection getConnection() {
		ensureIsInitialized();

		return provideConnection();
	}

	private static void close(Connection conn) {
		try {
			if (conn != null) conn.close();

		} catch (SQLException e) {
			throw U.rte("Error occurred while closing the connection!", e);
		}
	}

	private static void close(PreparedStatement stmt) {
		try {
			if (stmt != null) stmt.close();

		} catch (SQLException e) {
			throw U.rte("Error occurred while closing the statement!", e);
		}
	}

	private static void close(ResultSet rs) {
		try {
			if (rs != null) rs.close();

		} catch (SQLException e) {
			throw U.rte("Error occurred while closing the ResultSet!", e);
		}
	}

	public int execute(String sql, Object... args) {
		return doExecute(sql, null, args);
	}

	public int execute(String sql, Map namedArgs) {
		return doExecute(sql, namedArgs, null);
	}

	private int doExecute(String sql, Map namedArgs, Object[] args) {
		ensureIsInitialized();

		sql = toSql(sql);

		Log.debug("SQL", "sql", sql, "args", args);

		Connection conn = provideConnection();
		PreparedStatement stmt = null;

		try {
			stmt = JDBC.prepare(conn, sql, namedArgs, args);

			String q = sql.trim().toUpperCase();

			if (q.startsWith("INSERT ")
				|| q.startsWith("UPDATE ")
				|| q.startsWith("DELETE ")) {

				return stmt.executeUpdate();

			} else {
				return stmt.execute() ? 1 : 0;
			}

		} catch (SQLException e) {
			throw U.rte(e);

		} finally {
			close(stmt);
			close(conn);
		}
	}

	public int tryToExecute(String sql, Object... args) {
		return doTryToExecute(sql, null, args);
	}

	public int tryToExecute(String sql, Map namedArgs) {
		return doTryToExecute(sql, namedArgs, null);
	}

	private int doTryToExecute(String sql, Map namedArgs, Object[] args) {
		try {
			return doExecute(sql, namedArgs, args);

		} catch (Exception e) {
			// ignore the exception
			Log.warn("Ignoring JDBC error", "error", Msc.errorMsg(e));
		}

		return 0;
	}

	public  Results query(Class resultType, String sql, Map namedArgs) {
		return doQuery(resultType, sql, namedArgs, null);
	}

	public  Results query(Class resultType, String sql, Object... args) {
		return doQuery(resultType, sql, null, args);
	}

	private  Results doQuery(Class resultType, String sql, Map namedArgs, Object[] args) {
		sql = toSql(sql);
		JdbcData data = new JdbcData<>(this, resultType, sql, namedArgs, args);
		return new ResultsImpl<>(data);
	}

	 List runQuery(Class resultType, String sql, Map namedArgs, Object[] args, long start, long length) {
		ensureIsInitialized();

		U.must(start >= 0);
		U.must(length >= 0);

		if (start > 0 || length < Long.MAX_VALUE) {
			// FIXME paging
			throw Err.notReady();
		}

		Connection conn = provideConnection();
		PreparedStatement stmt = null;
		ResultSet rs = null;

		try {
			stmt = JDBC.prepare(conn, sql, namedArgs, args);
			rs = stmt.executeQuery();

			if (resultType.equals(Map.class)) {
				return U.cast(JDBC.rows(rs));
			} else {
				return JDBC.rows(resultType, rs);
			}

		} catch (SQLException e) {
			throw U.rte(e);

		} finally {
			close(rs);
			close(stmt);
			close(conn);
		}
	}

	long getQueryCount(String sql, Map namedArgs, Object[] args) {
		// FIXME find a better way
		return -1; // unknown
	}

	private static String toSql(String sql) {
		if (sql.endsWith(".sql")) {
			sql = Res.from(sql).mustExist().getContent();
		}

		return sql;
	}

	public Results> query(String sql, Object... args) {
		return U.cast(query(Map.class, sql, args));
	}

	public Results> query(String sql, Map namedArgs) {
		return U.cast(query(Map.class, sql, namedArgs));
	}

	private Connection provideConnection() {
		try {
			Connection conn;

			if (username != null) {
				String pass = U.safe(password);
				conn = pool.getConnection(url, username, pass);

				if (conn == null) {
					conn = DriverManager.getConnection(url, username, pass);
				}
			} else {
				conn = pool.getConnection(url);

				if (conn == null) {
					conn = DriverManager.getConnection(url);
				}
			}

			return conn;

		} catch (SQLException e) {
			throw U.rte("Cannot create JDBC connection!", e);
		}
	}

	public void release(Connection connection) {
		try {
			pool.releaseConnection(connection);
		} catch (SQLException e) {
			Log.error("Error while releasing a JDBC connection!", e);
		}
	}

	public String username() {
		return username;
	}

	public String password() {
		return password;
	}

	public String driver() {
		return driver;
	}

	public String url() {
		return url;
	}

	public ConnectionPool pool() {
		return pool;
	}

	public boolean usePool() {
		return usePool;
	}

	public ReadWriteMode mode() {
		return mode;
	}

	public JdbcClient init() {
		ensureIsInitialized();
		return this;
	}

	@Override
	public String toString() {
		return "JdbcClient{" +
			"initialized=" + initialized +
			", username='" + username + '\'' +
			", password='" + "*" + '\'' +
			", driver='" + driver + '\'' +
			", url='" + url + '\'' +
			", usePool=" + usePool +
			", pool=" + pool +
			", mode=" + mode +
			'}';
	}

	@Override
	public String getManageableType() {
		return "JDBC";
	}
}