const { getPool } = require('../middleware/auth');

const vacationDashboardModel = {
  async getSummary(year) {
    const db = getPool();
    const [rows] = await db.query(`
      SELECT
        d.department_id, COALESCE(d.department_name, '미배정') as department_name,
        COUNT(DISTINCT su.user_id) as employee_count,
        AVG(vb.total_days - vb.used_days) as avg_remaining,
        SUM(CASE WHEN (vb.total_days - vb.used_days) <= 2 THEN 1 ELSE 0 END) as low_balance_count
      FROM sso_users su
      LEFT JOIN departments d ON su.department_id = d.department_id
      LEFT JOIN sp_vacation_balances vb ON su.user_id = vb.user_id
        AND vb.year = ? AND vb.balance_type = 'AUTO'
      WHERE su.is_active = 1
      GROUP BY d.department_id
    `, [year]);
    return rows;
  },

  async getEmployeeList(year, filters = {}) {
    const db = getPool();
    let query = `
      SELECT su.user_id, su.name, su.username, su.hire_date, su.department_id,
        COALESCE(d.department_name, '미배정') as department_name,
        vb.id, vb.balance_type, vb.total_days, vb.used_days,
        (vb.total_days - vb.used_days) as remaining_days,
        vb.expires_at, vt.type_name, vt.type_code
      FROM sso_users su
      LEFT JOIN departments d ON su.department_id = d.department_id
      LEFT JOIN sp_vacation_balances vb ON su.user_id = vb.user_id
        AND (vb.year = ? OR (vb.balance_type = 'LONG_SERVICE' AND vb.expires_at IS NULL))
      LEFT JOIN vacation_types vt ON vb.vacation_type_id = vt.id
      WHERE su.is_active = 1
    `;
    const params = [year];

    if (filters.department_id) {
      query += ' AND su.department_id = ?';
      params.push(filters.department_id);
    }
    if (filters.search_name) {
      query += ' AND su.name LIKE ?';
      params.push(`%${filters.search_name}%`);
    }

    query += ' ORDER BY su.name ASC';

    const [rows] = await db.query(query, params);
    return rows;
  }
};

module.exports = vacationDashboardModel;