import { query, execute } from '../../../utils/db'
import { requireAdmin } from '../../../utils/session'

/**
 * 직원 삭제
 * DELETE /api/employee/[id]/delete
 */
export default defineEventHandler(async (event) => {
  // 관리자 권한 체크 (role 기반)
  const currentUserId = await requireAdmin(event)
  
  const employeeId = getRouterParam(event, 'id')
  if (!employeeId) {
    throw createError({ statusCode: 400, message: '직원 ID가 필요합니다.' })
  }
  
  // 본인 삭제 방지
  if (parseInt(employeeId) === currentUserId) {
    throw createError({ statusCode: 400, message: '본인은 삭제할 수 없습니다.' })
  }
  
  // 직원 존재 여부 확인
  const employee = await query<any>(`
    SELECT employee_id, employee_name FROM wr_employee_info WHERE employee_id = $1
  `, [employeeId])
  
  if (!employee[0]) {
    throw createError({ statusCode: 404, message: '직원을 찾을 수 없습니다.' })
  }
  
  // 주간보고 존재 여부 확인
  const reports = await query<any>(`
    SELECT COUNT(*) as cnt FROM wr_weekly_report WHERE author_id = $1
  `, [employeeId])
  
  const reportCount = parseInt(reports[0].cnt)
  
  if (reportCount > 0) {
    // 주간보고가 있으면 비활성화만
    await execute(`
      UPDATE wr_employee_info 
      SET is_active = false, updated_at = NOW()
      WHERE employee_id = $1
    `, [employeeId])
    
    return {
      success: true,
      action: 'deactivated',
      message: `${employee[0].employee_name}님이 비활성화되었습니다. (주간보고 ${reportCount}건 보존)`
    }
  } else {
    // 주간보고가 없으면 완전 삭제 (관련 데이터 포함)
    await execute(`DELETE FROM wr_employee_role WHERE employee_id = $1`, [employeeId])
    await execute(`DELETE FROM wr_session WHERE employee_id = $1`, [employeeId])
    await execute(`DELETE FROM wr_login_history WHERE employee_id = $1`, [employeeId])
    await execute(`DELETE FROM wr_employee_info WHERE employee_id = $1`, [employeeId])
    
    return {
      success: true,
      action: 'deleted',
      message: `${employee[0].employee_name}님이 삭제되었습니다.`
    }
  }
})