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

/**
 * Unhide all menus in tenant DB sys_menu only (visible '1' -> '0').
 * Does NOT touch master ylrz_saas or tenant_sys_menu.
 */
public class ShowAllTenantMenus {

    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]);
        Long onlyTenant = null;
        for (String arg : args) {
            if (arg.startsWith("tenant=")) {
                onlyTenant = Long.parseLong(arg.substring("tenant=".length()));
            }
        }
        System.out.println("=== Unhide all menus in tenant sys_menu only === dryRun=" + dryRun);

        List<Long> tenantIds;
        try (Connection master = open(MASTER_HOST, MASTER_PORT, MASTER_DB, MASTER_USER, MASTER_PASSWORD)) {
            tenantIds = loadActiveTenantIds(master);
        }

        int ok = 0;
        for (Long tenantId : tenantIds) {
            if (onlyTenant != null && !onlyTenant.equals(tenantId)) {
                continue;
            }
            TenantDb tenant;
            try (Connection master = open(MASTER_HOST, MASTER_PORT, MASTER_DB, MASTER_USER, MASTER_PASSWORD)) {
                tenant = loadTenant(master, tenantId);
            }
            if (tenant == null) {
                continue;
            }
            try (Connection conn = open(tenant.host, tenant.port, tenant.database, tenant.user, tenant.password)) {
                if (!tableExists(conn, "sys_menu")) {
                    System.out.println("[TENANT " + tenantId + "] " + tenant.database + " [SKIP] no sys_menu");
                    continue;
                }
                int hidden = countHidden(conn);
                if (hidden == 0) {
                    System.out.println("[TENANT " + tenantId + "] " + tenant.database + " already all visible");
                    ok++;
                    continue;
                }
                if (dryRun) {
                    preview(conn, tenantId, tenant.database, hidden);
                } else {
                    int n = unhide(conn);
                    System.out.println("[TENANT " + tenantId + "] " + tenant.database + " unhidden=" + n);
                }
                ok++;
            } catch (Exception e) {
                System.out.println("[TENANT " + tenantId + "] [ERR] " + e.getMessage());
            }
        }
        System.out.println("\nDone. tenants processed=" + ok);
    }

    private static int unhide(Connection conn) throws SQLException {
        String sql = "UPDATE sys_menu SET visible = '0', update_time = NOW() "
                + "WHERE visible = '1' AND status = '0'";
        try (Statement st = conn.createStatement()) {
            return st.executeUpdate(sql);
        }
    }

    private static int countHidden(Connection conn) throws SQLException {
        try (Statement st = conn.createStatement();
             ResultSet rs = st.executeQuery(
                     "SELECT COUNT(*) FROM sys_menu WHERE visible = '1' AND status = '0'")) {
            rs.next();
            return rs.getInt(1);
        }
    }

    private static void preview(Connection conn, long tenantId, String db, int total) throws SQLException {
        System.out.println("\n[TENANT " + tenantId + "] " + db + " will unhide " + total + " menus:");
        try (Statement st = conn.createStatement();
             ResultSet rs = st.executeQuery(
                     "SELECT menu_id, parent_id, menu_name, path FROM sys_menu "
                             + "WHERE visible = '1' AND status = '0' ORDER BY parent_id, menu_id")) {
            while (rs.next()) {
                System.out.printf("  id=%d parent=%d path=%s name=%s%n",
                        rs.getLong(1), rs.getLong(2), rs.getString(4), rs.getString(3));
            }
        }
    }

    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;
    }
}