import { execute, queryOne, insertReturning } from '../../../utils/db'
import { formatDate } from '../../../utils/week-calc'

interface AssignManagerBody {
  employeeId: number
  roleType: 'PM' | 'PL'
  startDate?: string
  changeReason?: string
}

/**
 * PM/PL 지정 (기존 담당자 종료 + 신규 등록)
 * POST /api/project/[id]/manager-assign
 */
export default defineEventHandler(async (event) => {
  const projectId = getRouterParam(event, 'id')
  const body = await readBody<AssignManagerBody>(event)
  
  if (!body.employeeId || !body.roleType) {
    throw createError({ statusCode: 400, message: '담당자와 역할을 선택해주세요.' })
  }
  
  if (!['PM', 'PL'].includes(body.roleType)) {
    throw createError({ statusCode: 400, message: '역할은 PM 또는 PL만 가능합니다.' })
  }
  
  const today = formatDate(new Date())
  const startDate = body.startDate || today
  
  // 기존 담당자 종료 (end_date가 NULL인 경우)
  await execute(`
    UPDATE wr_project_manager_history SET
      end_date = $1,
      change_reason = COALESCE(change_reason || ' / ', '') || '신규 담당자 지정으로 종료'
    WHERE project_id = $2 AND role_type = $3 AND end_date IS NULL
  `, [startDate, projectId, body.roleType])
  
  // 신규 담당자 등록
  const history = await insertReturning(`
    INSERT INTO wr_project_manager_history (
      project_id, employee_id, role_type, start_date, change_reason
    ) VALUES ($1, $2, $3, $4, $5)
    RETURNING *
  `, [projectId, body.employeeId, body.roleType, startDate, body.changeReason || null])
  
  return {
    success: true,
    historyId: history.history_id
  }
})