/**
 * Permission Model
 *
 * MariaDB user_page_permissions 테이블 CRUD
 */

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

// 기본 페이지 목록 (시스템별 구분)
const DEFAULT_PAGES = {
  // ===== System 1 - 공장관리 =====
  // 작업 관리
  's1.dashboard':                { title: '대시보드', system: 'system1', group: '작업 관리', default_access: true },
  's1.work.tbm':                 { title: 'TBM 관리', system: 'system1', group: '작업 관리', default_access: true },
  's1.work.report_create':       { title: '작업보고서 작성', system: 'system1', group: '작업 관리', default_access: true },
  's1.work.analysis':            { title: '작업 분석', system: 'system1', group: '작업 관리', default_access: false },
  's1.work.nonconformity':       { title: '부적합 현황', system: 'system1', group: '작업 관리', default_access: true },
  // 공장 관리
  's1.factory.repair_management':{ title: '시설설비 관리', system: 'system1', group: '공장 관리', default_access: false },
  's1.inspection.daily_patrol':  { title: '일일순회점검', system: 'system1', group: '공장 관리', default_access: false },
  's1.inspection.checkin':       { title: '출근 체크', system: 'system1', group: '공장 관리', default_access: true },
  's1.inspection.work_status':   { title: '근무 현황', system: 'system1', group: '공장 관리', default_access: false },
  // 안전 관리
  's1.safety.visit_request':     { title: '출입 신청', system: 'system1', group: '안전 관리', default_access: true },
  's1.safety.management':        { title: '안전 관리', system: 'system1', group: '안전 관리', default_access: false },
  's1.safety.checklist_manage':  { title: '체크리스트 관리', system: 'system1', group: '안전 관리', default_access: false },
  // 근태 관리
  's1.attendance.my_vacation_info':    { title: '내 연차 정보', system: 'system1', group: '근태 관리', default_access: true },
  's1.attendance.monthly':             { title: '월간 근태', system: 'system1', group: '근태 관리', default_access: true },
  's1.attendance.vacation_request':    { title: '휴가 신청', system: 'system1', group: '근태 관리', default_access: true },
  's1.attendance.vacation_management': { title: '휴가 관리', system: 'system1', group: '근태 관리', default_access: false },
  's1.attendance.vacation_allocation': { title: '휴가 발생 입력', system: 'system1', group: '근태 관리', default_access: false },
  's1.attendance.annual_overview':     { title: '연간 휴가 현황', system: 'system1', group: '근태 관리', default_access: false },
  // 시스템 관리
  's1.admin.workers':            { title: '작업자 관리', system: 'system1', group: '시스템 관리', default_access: false },
  's1.admin.projects':           { title: '프로젝트 관리', system: 'system1', group: '시스템 관리', default_access: false },
  's1.admin.tasks':              { title: '작업 관리', system: 'system1', group: '시스템 관리', default_access: false },
  's1.admin.workplaces':         { title: '작업장 관리', system: 'system1', group: '시스템 관리', default_access: false },
  's1.admin.equipments':         { title: '설비 관리', system: 'system1', group: '시스템 관리', default_access: false },
  's1.admin.issue_categories':   { title: '신고 카테고리 관리', system: 'system1', group: '시스템 관리', default_access: false },
  's1.admin.attendance_report':  { title: '출퇴근-보고서 대조', system: 'system1', group: '시스템 관리', default_access: false },

  // ===== System 3 - 부적합관리 =====
  // 메인
  'issues_dashboard':   { title: '현황판', system: 'system3', group: '메인', default_access: true },
  'issues_inbox':       { title: '수신함', system: 'system3', group: '메인', default_access: true },
  'issues_management':  { title: '관리함', system: 'system3', group: '메인', default_access: false },
  'issues_archive':     { title: '폐기함', system: 'system3', group: '메인', default_access: false },
  // 보고서
  'reports':            { title: '보고서', system: 'system3', group: '보고서', default_access: false },
  'reports_daily':      { title: '일일보고서', system: 'system3', group: '보고서', default_access: false },
  'reports_weekly':     { title: '주간보고서', system: 'system3', group: '보고서', default_access: false },
  'reports_monthly':    { title: '월간보고서', system: 'system3', group: '보고서', default_access: false },
  // AI
  'ai_assistant':       { title: 'AI 어시스턴트', system: 'system3', group: 'AI', default_access: false }
};

/**
 * 사용자의 페이지 권한 목록 조회
 */
async function getUserPermissions(userId) {
  const db = getPool();
  const [rows] = await db.query(
    'SELECT * FROM user_page_permissions WHERE user_id = ? ORDER BY page_name',
    [userId]
  );
  return rows;
}

/**
 * 단건 권한 부여/업데이트 (UPSERT)
 */
async function grantPermission({ user_id, page_name, can_access, granted_by_id, notes }) {
  const db = getPool();
  const [result] = await db.query(
    `INSERT INTO user_page_permissions (user_id, page_name, can_access, granted_by_id, notes)
     VALUES (?, ?, ?, ?, ?)
     ON DUPLICATE KEY UPDATE can_access = VALUES(can_access), granted_by_id = VALUES(granted_by_id), notes = VALUES(notes), granted_at = CURRENT_TIMESTAMP`,
    [user_id, page_name, can_access, granted_by_id, notes || null]
  );
  return { id: result.insertId, user_id, page_name, can_access };
}

/**
 * 일괄 권한 부여
 */
async function bulkGrant({ user_id, permissions, granted_by_id }) {
  const db = getPool();
  let count = 0;

  for (const perm of permissions) {
    if (!DEFAULT_PAGES[perm.page_name]) continue;
    await db.query(
      `INSERT INTO user_page_permissions (user_id, page_name, can_access, granted_by_id)
       VALUES (?, ?, ?, ?)
       ON DUPLICATE KEY UPDATE can_access = VALUES(can_access), granted_by_id = VALUES(granted_by_id), granted_at = CURRENT_TIMESTAMP`,
      [user_id, perm.page_name, perm.can_access, granted_by_id]
    );
    count++;
  }

  return { updated_count: count };
}

/**
 * 접근 권한 확인 (우선순위: 개인 > 부서 > 기본값)
 */
async function checkAccess(userId, pageName) {
  const db = getPool();

  // 1. 명시적 개인 권한
  const [rows] = await db.query(
    'SELECT can_access FROM user_page_permissions WHERE user_id = ? AND page_name = ?',
    [userId, pageName]
  );
  if (rows.length > 0) {
    return { can_access: rows[0].can_access, reason: 'explicit_permission' };
  }

  // 2. 부서 권한
  const [userRows] = await db.query(
    'SELECT department_id FROM sso_users WHERE user_id = ?',
    [userId]
  );
  if (userRows.length > 0 && userRows[0].department_id) {
    const [deptRows] = await db.query(
      'SELECT can_access FROM department_page_permissions WHERE department_id = ? AND page_name = ?',
      [userRows[0].department_id, pageName]
    );
    if (deptRows.length > 0) {
      return { can_access: deptRows[0].can_access, reason: 'department_permission' };
    }
  }

  // 3. 기본 권한
  const pageConfig = DEFAULT_PAGES[pageName];
  if (!pageConfig) {
    return { can_access: false, reason: 'invalid_page' };
  }
  return { can_access: pageConfig.default_access, reason: 'default_permission' };
}

/**
 * 부서별 페이지 권한 조회
 */
async function getDepartmentPermissions(departmentId) {
  const db = getPool();
  const [rows] = await db.query(
    'SELECT * FROM department_page_permissions WHERE department_id = ? ORDER BY page_name',
    [departmentId]
  );
  return rows;
}

/**
 * 부서 권한 단건 UPSERT
 */
async function setDepartmentPermission({ department_id, page_name, can_access, granted_by_id }) {
  const db = getPool();
  const [result] = await db.query(
    `INSERT INTO department_page_permissions (department_id, page_name, can_access, granted_by_id)
     VALUES (?, ?, ?, ?)
     ON DUPLICATE KEY UPDATE can_access = VALUES(can_access), granted_by_id = VALUES(granted_by_id), granted_at = CURRENT_TIMESTAMP`,
    [department_id, page_name, can_access, granted_by_id]
  );
  return { id: result.insertId, department_id, page_name, can_access };
}

/**
 * 부서 권한 일괄 설정
 */
async function bulkSetDepartmentPermissions({ department_id, permissions, granted_by_id }) {
  const db = getPool();
  let count = 0;

  for (const perm of permissions) {
    if (!DEFAULT_PAGES[perm.page_name]) continue;
    await db.query(
      `INSERT INTO department_page_permissions (department_id, page_name, can_access, granted_by_id)
       VALUES (?, ?, ?, ?)
       ON DUPLICATE KEY UPDATE can_access = VALUES(can_access), granted_by_id = VALUES(granted_by_id), granted_at = CURRENT_TIMESTAMP`,
      [department_id, perm.page_name, perm.can_access, granted_by_id]
    );
    count++;
  }

  return { updated_count: count };
}

/**
 * 부서 권한 삭제 (기본값으로 복귀)
 */
async function deleteDepartmentPermission(departmentId, pageName) {
  const db = getPool();
  const [result] = await db.query(
    'DELETE FROM department_page_permissions WHERE department_id = ? AND page_name = ?',
    [departmentId, pageName]
  );
  return result.affectedRows > 0;
}

/**
 * 사용자 권한 + 출처 조회 (각 페이지별 현재 적용 권한과 출처 반환)
 */
async function getUserPermissionsWithSource(userId) {
  const db = getPool();

  // 개인 권한 조회
  const [userPerms] = await db.query(
    'SELECT page_name, can_access FROM user_page_permissions WHERE user_id = ?',
    [userId]
  );
  const userPermMap = {};
  userPerms.forEach(p => { userPermMap[p.page_name] = !!p.can_access; });

  // 부서 권한 조회
  const [userRows] = await db.query(
    'SELECT department_id FROM sso_users WHERE user_id = ?',
    [userId]
  );
  const deptId = userRows.length > 0 ? userRows[0].department_id : null;

  const deptPermMap = {};
  if (deptId) {
    const [deptPerms] = await db.query(
      'SELECT page_name, can_access FROM department_page_permissions WHERE department_id = ?',
      [deptId]
    );
    deptPerms.forEach(p => { deptPermMap[p.page_name] = !!p.can_access; });
  }

  // 모든 페이지에 대해 결과 조합
  const result = {};
  for (const [pageName, config] of Object.entries(DEFAULT_PAGES)) {
    if (pageName in userPermMap) {
      result[pageName] = { can_access: userPermMap[pageName], source: 'explicit' };
    } else if (pageName in deptPermMap) {
      result[pageName] = { can_access: deptPermMap[pageName], source: 'department' };
    } else {
      result[pageName] = { can_access: config.default_access, source: 'default' };
    }
  }

  return { permissions: result, department_id: deptId };
}

/**
 * 권한 삭제 (기본값으로 되돌림)
 */
async function deletePermission(permissionId) {
  const db = getPool();
  const [rows] = await db.query(
    'SELECT * FROM user_page_permissions WHERE id = ?',
    [permissionId]
  );
  if (rows.length === 0) return null;

  await db.query('DELETE FROM user_page_permissions WHERE id = ?', [permissionId]);
  return rows[0];
}

module.exports = {
  DEFAULT_PAGES,
  getUserPermissions,
  grantPermission,
  bulkGrant,
  checkAccess,
  deletePermission,
  getDepartmentPermissions,
  setDepartmentPermission,
  bulkSetDepartmentPermissions,
  deleteDepartmentPermission,
  getUserPermissionsWithSource
};