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

/**
 * 批量更新菜单名：「租户语义关键词」→「语义关键词」(menu_id=29933)
 *
 * 影响范围：
 *   主库：
 *     1. sys_menu              (admin 总后台菜单)
 *     2. tenant_sys_menu       (租户管理端模板表)
 *     3. tenant_company_menu   (租户销售端模板表)
 *   各租户库：
 *     4. sys_menu              (租户管理端菜单)
 *     5. company_menu          (租户销售端菜单)
 *
 * 用法：
 *   java RenameLobsterSemanticMenu dry-run   # 仅预览
 *   java RenameLobsterSemanticMenu           # 真实执行
 */
public class RenameLobsterSemanticMenu {

    private static final long MENU_ID = 29933L;
    private static final String OLD_NAME = "租户语义关键词";
    private static final String NEW_NAME = "语义关键词";

    private static final String MASTER_HOST = getenv("DB_HOST", "cq-cdb-8fjmemkb.sql.tencentcdb.com");
    private static final int MASTER_PORT = Integer.parseInt(getenv("DB_PORT", "27220"));
    private static final String MASTER_USER = getenv("DB_USER", "root");
    private static final String MASTER_PASSWORD = getenv("DB_PASSWORD", "Ylrz_1q2w3e4r5t6y");
    private static final String MASTER_DB = getenv("DB_NAME", "ylrz_saas");

    public static void main(String[] args) throws Exception {
        Class.forName("com.mysql.cj.jdbc.Driver");
        boolean dryRun = args.length > 0 && "dry-run".equalsIgnoreCase(args[0]);
        System.out.println("=== 重命名菜单: 「" + OLD_NAME + "」→「" + NEW_NAME + "」 (menu_id=" + MENU_ID + ") ===");
        System.out.println("dryRun=" + dryRun);

        int masterOk = 0;
        int tenantOk = 0;
        int tenantSkip = 0;
        int tenantFail = 0;

        // ===== 1. 主库 =====
        System.out.println("\n[MASTER] " + MASTER_DB);
        try (Connection master = open(MASTER_HOST, MASTER_PORT, MASTER_DB, MASTER_USER, MASTER_PASSWORD)) {
            masterOk += updateMenu(master, "sys_menu", dryRun);
            masterOk += updateMenu(master, "tenant_sys_menu", dryRun);
            masterOk += updateMenu(master, "tenant_company_menu", dryRun);
        } catch (Exception e) {
            System.out.println("  [ERR] " + e.getMessage());
        }

        // ===== 2. 各租户库 =====
        List<Long> tenantIds;
        try (Connection master = open(MASTER_HOST, MASTER_PORT, MASTER_DB, MASTER_USER, MASTER_PASSWORD)) {
            tenantIds = loadActiveTenantIds(master);
        }

        for (Long tenantId : tenantIds) {
            TenantDb tenant;
            try (Connection master = open(MASTER_HOST, MASTER_PORT, MASTER_DB, MASTER_USER, MASTER_PASSWORD)) {
                tenant = loadTenant(master, tenantId);
            }
            if (tenant == null) {
                tenantSkip++;
                continue;
            }
            System.out.println("\n[TENANT " + tenantId + "] " + tenant.database);
            try (Connection conn = open(tenant.host, tenant.port, tenant.database, tenant.user, tenant.password)) {
                int n = updateMenu(conn, "sys_menu", dryRun);
                if (n > 0) tenantOk++;
                int m = updateMenu(conn, "company_menu", dryRun);
                if (m > 0) tenantOk++;
                if (n == 0 && m == 0) tenantSkip++;
            } catch (Exception e) {
                System.out.println("  [ERR] " + e.getMessage());
                tenantFail++;
            }
        }

        System.out.println("\n=== SUMMARY ===");
        System.out.println("Master updated=" + masterOk);
        System.out.println("Tenant updated=" + tenantOk + " SKIP=" + tenantSkip + " FAIL=" + tenantFail);
        if (tenantFail > 0) {
            System.exit(1);
        }
    }

    /**
     * 更新指定菜单表中的菜单名。
     * 返回受影响的行数。
     */
    private static int updateMenu(Connection conn, String table, boolean dryRun) throws SQLException {
        if (!tableExists(conn, table)) {
            System.out.println("  [SKIP] no " + table);
            return 0;
        }

        // 先查询当前菜单名
        String currentName = null;
        try (PreparedStatement ps = conn.prepareStatement(
                "SELECT menu_name FROM " + table + " WHERE menu_id = ? LIMIT 1")) {
            ps.setLong(1, MENU_ID);
            try (ResultSet rs = ps.executeQuery()) {
                if (rs.next()) {
                    currentName = rs.getString(1);
                }
            }
        }
        if (currentName == null) {
            System.out.println("  [SKIP] " + table + ": menu_id=" + MENU_ID + " not found");
            return 0;
        }

        if (NEW_NAME.equals(currentName)) {
            System.out.println("  [SKIP] " + table + ": already renamed to '" + NEW_NAME + "'");
            return 0;
        }

        System.out.println("  " + table + ": '" + currentName + "' -> '" + NEW_NAME + "'");

        if (dryRun) {
            return 1;
        }

        String sql = "UPDATE " + table + " SET menu_name = ?, update_time = NOW() WHERE menu_id = ?";
        try (PreparedStatement ps = conn.prepareStatement(sql)) {
            ps.setString(1, NEW_NAME);
            ps.setLong(2, MENU_ID);
            return ps.executeUpdate();
        }
    }

    private static boolean tableExists(Connection conn, String table) throws SQLException {
        try (ResultSet rs = conn.getMetaData().getTables(null, null, table, null)) {
            return rs.next();
        }
    }

    private static List<Long> loadActiveTenantIds(Connection master) throws SQLException {
        List<Long> ids = new ArrayList<>();
        try (Statement st = master.createStatement();
             ResultSet rs = st.executeQuery("SELECT id FROM tenant_info WHERE status = 1 ORDER BY id")) {
            while (rs.next()) {
                ids.add(rs.getLong(1));
            }
        }
        return ids;
    }

    private static TenantDb loadTenant(Connection master, long tenantId) throws SQLException {
        try (PreparedStatement ps = master.prepareStatement(
                "SELECT db_url, db_account, db_pwd FROM tenant_info WHERE id = ? AND status = 1 LIMIT 1")) {
            ps.setLong(1, tenantId);
            try (ResultSet rs = ps.executeQuery()) {
                if (!rs.next()) {
                    return null;
                }
                return parseJdbcUrl(rs.getString("db_url"), rs.getString("db_account"), rs.getString("db_pwd"));
            }
        }
    }

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

    private static Connection open(String host, int port, String database, String user, String password)
            throws SQLException {
        return DriverManager.getConnection(
                "jdbc:mysql://" + host + ":" + port + "/" + database
                        + "?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&allowMultiQueries=true",
                user, password);
    }

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

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