import java.io.*;
import java.sql.*;
import java.util.*;

/**
 * Delete hidden lobster menu 29926 (node-detail) from master + all tenant DBs.
 */
public class DeleteLobsterNodeDetailMenu29926 {

    private static final long MENU_ID = 29926L;
    private static final String HOST = getenv("DB_HOST", "cq-cdb-8fjmemkb.sql.tencentcdb.com");
    private static final int PORT = Integer.parseInt(getenv("DB_PORT", "27220"));
    private static final String USER = getenv("DB_USER", "root");
    private static final String PASS = getenv("DB_PASSWORD", "Ylrz_1q2w3e4r5t6y");
    private static final String MASTER_DB = getenv("DB_NAME", "ylrz_saas");

    private static final String[] MENU_TABLES = {"sys_menu", "tenant_sys_menu", "tenant_company_menu", "company_menu"};
    private static final String[][] ROLE_TABLES = {
            {"sys_role_menu", "sys_menu"},
            {"company_role_menu", "company_menu"}
    };

    public static void main(String[] args) throws Exception {
        Class.forName("com.mysql.cj.jdbc.Driver");
        new File("output").mkdirs();
        try (PrintWriter report = new PrintWriter(new OutputStreamWriter(
                new FileOutputStream("output/delete-menu-29926-report.txt"), "UTF-8"));
             Connection master = open(MASTER_DB)) {
            deleteOnConn(master, report, MASTER_DB);

            for (TenantDb tenant : loadTenants(master)) {
                try (Connection c = openDb(tenant)) {
                    deleteOnConn(c, report, tenant.database);
                } catch (Exception e) {
                    report.println("[ERROR] " + tenant.database + ": " + e.getMessage());
                }
            }
            report.println("\nDone.");
            System.out.println("Wrote output/delete-menu-29926-report.txt");
        }
    }

    private static void deleteOnConn(Connection conn, PrintWriter report, String label) throws SQLException {
        if (!menuExists(conn)) {
            report.println(label + ": menu 29926 not found, skip");
            return;
        }
        for (String[] pair : ROLE_TABLES) {
            if (!tableExists(conn, pair[0])) {
                continue;
            }
            try (PreparedStatement ps = conn.prepareStatement(
                    "DELETE FROM " + pair[0] + " WHERE menu_id = ?")) {
                ps.setLong(1, MENU_ID);
                int n = ps.executeUpdate();
                if (n > 0) {
                    report.println(label + "." + pair[0] + " deleted role refs=" + n);
                }
            }
        }
        for (String table : MENU_TABLES) {
            if (!tableExists(conn, table)) {
                continue;
            }
            try (PreparedStatement ps = conn.prepareStatement("DELETE FROM " + table + " WHERE menu_id = ?")) {
                ps.setLong(1, MENU_ID);
                int n = ps.executeUpdate();
                if (n > 0) {
                    report.println(label + "." + table + " deleted rows=" + n);
                }
            }
        }
    }

    private static boolean menuExists(Connection conn) throws SQLException {
        for (String table : MENU_TABLES) {
            if (!tableExists(conn, table)) {
                continue;
            }
            try (PreparedStatement ps = conn.prepareStatement("SELECT 1 FROM " + table + " WHERE menu_id = ? LIMIT 1")) {
                ps.setLong(1, MENU_ID);
                try (ResultSet rs = ps.executeQuery()) {
                    if (rs.next()) {
                        return true;
                    }
                }
            }
        }
        return false;
    }

    private static List<TenantDb> loadTenants(Connection master) throws SQLException {
        List<TenantDb> list = new ArrayList<>();
        try (Statement st = master.createStatement();
             ResultSet rs = st.executeQuery("SELECT id, db_url, db_account, db_pwd FROM tenant_info WHERE status = 1 ORDER BY id")) {
            while (rs.next()) {
                TenantDb t = parseJdbcUrl(rs.getString("db_url"), rs.getString("db_account"), rs.getString("db_pwd"));
                if (t != null) {
                    list.add(t);
                }
            }
        }
        return list;
    }

    private static TenantDb parseJdbcUrl(String jdbcUrl, String user, String password) {
        if (jdbcUrl == null || !jdbcUrl.startsWith("jdbc:mysql://")) {
            return null;
        }
        String body = jdbcUrl.substring("jdbc:mysql://".length());
        int slash = body.indexOf('/');
        if (slash < 0) {
            return null;
        }
        String hostPort = body.substring(0, slash);
        String rest = body.substring(slash + 1);
        int q = rest.indexOf('?');
        String database = q >= 0 ? rest.substring(0, q) : rest;
        TenantDb t = new TenantDb();
        int colon = hostPort.indexOf(':');
        if (colon >= 0) {
            t.host = hostPort.substring(0, colon);
            t.port = Integer.parseInt(hostPort.substring(colon + 1));
        } else {
            t.host = hostPort;
            t.port = 3306;
        }
        t.database = database;
        t.user = user != null ? user : USER;
        t.password = password != null ? password : PASS;
        return t;
    }

    private static boolean tableExists(Connection conn, String table) throws SQLException {
        try (PreparedStatement ps = conn.prepareStatement(
                "SELECT 1 FROM information_schema.tables WHERE table_schema = DATABASE() AND table_name = ? LIMIT 1")) {
            ps.setString(1, table);
            try (ResultSet rs = ps.executeQuery()) {
                return rs.next();
            }
        }
    }

    private static Connection open(String database) throws SQLException {
        return DriverManager.getConnection(buildUrl(HOST, PORT, database), USER, PASS);
    }

    private static Connection openDb(TenantDb tenant) throws SQLException {
        return DriverManager.getConnection(buildUrl(tenant.host, tenant.port, tenant.database), tenant.user, tenant.password);
    }

    private static String buildUrl(String host, int port, String database) {
        return "jdbc:mysql://" + host + ":" + port + "/" + database
                + "?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&allowMultiQueries=true";
    }

    private static String getenv(String key, String defaultValue) {
        String v = System.getenv(key);
        return v != null && !v.isEmpty() ? v : defaultValue;
    }

    private static class TenantDb {
        String host;
        int port;
        String database;
        String user;
        String password;
    }
}