import { query } from '../../utils/db'

/**
 * 유지보수 업무 목록 조회
 * GET /api/maintenance/list
 * 
 * Query params:
 * - projectId: 프로젝트 ID
 * - status: 상태 (PENDING, IN_PROGRESS, COMPLETED)
 * - priority: 우선순위 (HIGH, MEDIUM, LOW)
 * - keyword: 검색어 (제목, 내용, 요청자)
 * - startDate, endDate: 요청일 범위
 * - page, pageSize: 페이지네이션
 */
export default defineEventHandler(async (event) => {
  const params = getQuery(event)
  
  const projectId = params.projectId ? Number(params.projectId) : null
  const status = params.status as string | null
  const priority = params.priority as string | null
  const keyword = params.keyword as string | null
  const startDate = params.startDate as string | null
  const endDate = params.endDate as string | null
  const page = Number(params.page) || 1
  const pageSize = Number(params.pageSize) || 20
  
  const conditions: string[] = []
  const values: any[] = []
  let paramIndex = 1
  
  if (projectId) {
    conditions.push(`t.project_id = $${paramIndex++}`)
    values.push(projectId)
  }
  
  if (status) {
    conditions.push(`t.status = $${paramIndex++}`)
    values.push(status)
  }
  
  if (priority) {
    conditions.push(`t.priority = $${paramIndex++}`)
    values.push(priority)
  }
  
  if (keyword) {
    conditions.push(`(t.request_title ILIKE $${paramIndex} OR t.request_content ILIKE $${paramIndex} OR t.requester_name ILIKE $${paramIndex})`)
    values.push(`%${keyword}%`)
    paramIndex++
  }
  
  if (startDate) {
    conditions.push(`t.request_date >= $${paramIndex++}`)
    values.push(startDate)
  }
  
  if (endDate) {
    conditions.push(`t.request_date <= $${paramIndex++}`)
    values.push(endDate)
  }
  
  const whereClause = conditions.length > 0 ? `WHERE ${conditions.join(' AND ')}` : ''
  
  // 전체 카운트
  const countSql = `SELECT COUNT(*) as total FROM wr_maintenance_task t ${whereClause}`
  const countResult = await query(countSql, values)
  const total = Number(countResult[0]?.total || 0)
  
  // 목록 조회
  const offset = (page - 1) * pageSize
  const listSql = `
    SELECT 
      t.*,
      p.project_name,
      e.employee_name as assignee_name
    FROM wr_maintenance_task t
    LEFT JOIN wr_project_info p ON t.project_id = p.project_id
    LEFT JOIN wr_employee_info e ON t.assignee_id = e.employee_id
    ${whereClause}
    ORDER BY t.request_date DESC, t.task_id DESC
    LIMIT $${paramIndex++} OFFSET $${paramIndex++}
  `
  values.push(pageSize, offset)
  
  const tasks = await query(listSql, values)
  
  return {
    tasks: tasks.map((t: any) => ({
      taskId: t.task_id,
      projectId: t.project_id,
      projectName: t.project_name,
      requestDate: t.request_date,
      requestTitle: t.request_title,
      requestContent: t.request_content,
      requesterName: t.requester_name,
      requesterContact: t.requester_contact,
      taskType: t.task_type,
      priority: t.priority,
      status: t.status,
      assigneeId: t.assignee_id,
      assigneeName: t.assignee_name,
      devCompletedAt: t.dev_completed_at,
      opsCompletedAt: t.ops_completed_at,
      clientConfirmedAt: t.client_confirmed_at,
      createdAt: t.created_at
    })),
    pagination: {
      page,
      pageSize,
      total,
      totalPages: Math.ceil(total / pageSize)
    }
  }
})