// models/notificationRecipientModel.js
const { getPool } = require('./userModel');

const NOTIFICATION_TYPES = {
  repair: '설비 수리',
  safety: '안전 신고',
  nonconformity: '부적합 신고',
  equipment: '설비 관련',
  maintenance: '정기점검',
  system: '시스템'
};

const notificationRecipientModel = {
  // 알림 유형 목록 가져오기
  getTypes() {
    return NOTIFICATION_TYPES;
  },

  // 유형별 수신자 목록 조회
  async getByType(notificationType) {
    const db = getPool();
    const [rows] = await db.query(
      `SELECT nr.*, u.username, u.name as user_name
       FROM notification_recipients nr
       JOIN sso_users u ON nr.user_id = u.user_id
       WHERE nr.notification_type = ? AND nr.is_active = 1
       ORDER BY u.name`,
      [notificationType]
    );
    return rows;
  },

  // 전체 수신자 목록 조회 (유형별 그룹화)
  async getAll() {
    const db = getPool();
    const [rows] = await db.query(
      `SELECT nr.*, u.username, u.name as user_name
       FROM notification_recipients nr
       JOIN sso_users u ON nr.user_id = u.user_id
       WHERE nr.is_active = 1
       ORDER BY nr.notification_type, u.name`
    );

    // 유형별로 그룹화
    const grouped = {};
    for (const type in NOTIFICATION_TYPES) {
      grouped[type] = {
        label: NOTIFICATION_TYPES[type],
        recipients: []
      };
    }

    rows.forEach(row => {
      if (grouped[row.notification_type]) {
        grouped[row.notification_type].recipients.push(row);
      }
    });

    return grouped;
  },

  // 수신자 추가
  async add(notificationType, userId, createdBy = null) {
    const db = getPool();
    const [result] = await db.query(
      `INSERT INTO notification_recipients (notification_type, user_id, created_by)
       VALUES (?, ?, ?)
       ON DUPLICATE KEY UPDATE is_active = 1`,
      [notificationType, userId, createdBy]
    );
    return result.insertId || result.affectedRows > 0;
  },

  // 수신자 제거 (soft delete)
  async remove(notificationType, userId) {
    const db = getPool();
    const [result] = await db.query(
      `UPDATE notification_recipients SET is_active = 0
       WHERE notification_type = ? AND user_id = ?`,
      [notificationType, userId]
    );
    return result.affectedRows > 0;
  },

  // 수신자 완전 삭제
  async delete(notificationType, userId) {
    const db = getPool();
    const [result] = await db.query(
      `DELETE FROM notification_recipients
       WHERE notification_type = ? AND user_id = ?`,
      [notificationType, userId]
    );
    return result.affectedRows > 0;
  },

  // 유형별 수신자 user_id 목록만 가져오기 (알림 생성용)
  async getRecipientIds(notificationType) {
    const db = getPool();
    const [rows] = await db.query(
      `SELECT user_id FROM notification_recipients
       WHERE notification_type = ? AND is_active = 1`,
      [notificationType]
    );
    return rows.map(r => r.user_id);
  },

  // 사용자가 특정 유형의 수신자인지 확인
  async isRecipient(notificationType, userId) {
    const db = getPool();
    const [[row]] = await db.query(
      `SELECT 1 FROM notification_recipients
       WHERE notification_type = ? AND user_id = ? AND is_active = 1`,
      [notificationType, userId]
    );
    return !!row;
  },

  // 유형별 수신자 일괄 설정
  async setRecipients(notificationType, userIds, createdBy = null) {
    const db = getPool();

    // 기존 수신자 비활성화
    await db.query(
      `UPDATE notification_recipients SET is_active = 0
       WHERE notification_type = ?`,
      [notificationType]
    );

    // 새 수신자 추가
    if (userIds && userIds.length > 0) {
      const values = userIds.map(userId => [notificationType, userId, createdBy]);
      await db.query(
        `INSERT INTO notification_recipients (notification_type, user_id, created_by)
         VALUES ?
         ON DUPLICATE KEY UPDATE is_active = 1`,
        [values]
      );
    }

    return true;
  }
};

module.exports = notificationRecipientModel;