/**
 * Copyright © 2016-2018 The Thingsboard Authors
 *
 * 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.
 */
package org.thingsboard.server.service.install;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Profile;
import org.springframework.stereotype.Service;
import org.thingsboard.server.dao.dashboard.DashboardService;
import org.thingsboard.server.dao.util.SqlDao;
import org.thingsboard.server.service.install.sql.SqlDbHelper;

import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.sql.Connection;
import java.sql.DriverManager;

import static org.thingsboard.server.service.install.DatabaseHelper.ASSIGNED_CUSTOMERS;
import static org.thingsboard.server.service.install.DatabaseHelper.CONFIGURATION;
import static org.thingsboard.server.service.install.DatabaseHelper.CUSTOMER_ID;
import static org.thingsboard.server.service.install.DatabaseHelper.DASHBOARD;
import static org.thingsboard.server.service.install.DatabaseHelper.ID;
import static org.thingsboard.server.service.install.DatabaseHelper.SEARCH_TEXT;
import static org.thingsboard.server.service.install.DatabaseHelper.TENANT_ID;
import static org.thingsboard.server.service.install.DatabaseHelper.TITLE;

@Service
@Profile("install")
@Slf4j
@SqlDao
public class SqlDatabaseUpgradeService implements DatabaseUpgradeService {

    private static final String SCHEMA_UPDATE_SQL = "schema_update.sql";

    @Value("${spring.datasource.url}")
    private String dbUrl;

    @Value("${spring.datasource.username}")
    private String dbUserName;

    @Value("${spring.datasource.password}")
    private String dbPassword;

    @Autowired
    private DashboardService dashboardService;

    @Autowired
    private InstallScripts installScripts;

    @Override
    public void upgradeDatabase(String fromVersion) throws Exception {
        switch (fromVersion) {
            case "1.3.0":
                log.info("Updating schema ...");
                Path schemaUpdateFile = Paths.get(installScripts.getDataDir(), "upgrade", "1.3.1", SCHEMA_UPDATE_SQL);
                try (Connection conn = DriverManager.getConnection(dbUrl, dbUserName, dbPassword)) {
                    loadSql(schemaUpdateFile, conn);
                }
                log.info("Schema updated.");
                break;
            case "1.3.1":
                try (Connection conn = DriverManager.getConnection(dbUrl, dbUserName, dbPassword)) {

                    log.info("Dumping dashboards ...");
                    Path dashboardsDump = SqlDbHelper.dumpTableIfExists(conn, DASHBOARD,
                            new String[]{ID, TENANT_ID, CUSTOMER_ID, TITLE, SEARCH_TEXT, ASSIGNED_CUSTOMERS, CONFIGURATION},
                            new String[]{"", "", "", "", "", "", ""},
                            "tb-dashboards", true);
                    log.info("Dashboards dumped.");

                    log.info("Updating schema ...");
                    schemaUpdateFile = Paths.get(installScripts.getDataDir(), "upgrade", "1.4.0", SCHEMA_UPDATE_SQL);
                    loadSql(schemaUpdateFile, conn);
                    log.info("Schema updated.");

                    log.info("Restoring dashboards ...");
                    if (dashboardsDump != null) {
                        SqlDbHelper.loadTable(conn, DASHBOARD,
                                new String[]{ID, TENANT_ID, TITLE, SEARCH_TEXT, CONFIGURATION}, dashboardsDump, true);
                        DatabaseHelper.upgradeTo40_assignDashboards(dashboardsDump, dashboardService, true);
                        Files.deleteIfExists(dashboardsDump);
                    }
                    log.info("Dashboards restored.");
                }
                break;
            case "1.4.0":
                try (Connection conn = DriverManager.getConnection(dbUrl, dbUserName, dbPassword)) {
                    log.info("Updating schema ...");
                    schemaUpdateFile = Paths.get(installScripts.getDataDir(), "upgrade", "2.0.0", SCHEMA_UPDATE_SQL);
                    loadSql(schemaUpdateFile, conn);
                    log.info("Schema updated.");
                }
                break;
            default:
                throw new RuntimeException("Unable to upgrade SQL database, unsupported fromVersion: " + fromVersion);
        }
    }

    private void loadSql(Path sqlFile, Connection conn) throws Exception {
        String sql = new String(Files.readAllBytes(sqlFile), Charset.forName("UTF-8"));
        conn.createStatement().execute(sql); //NOSONAR, ignoring because method used to execute thingsboard database upgrade script
        Thread.sleep(5000);
    }
}
