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

export default defineEventHandler(async (event) => {
  const queryParams = getQuery(event)
  
  const type = queryParams.type as string || 'short-term'
  const period = queryParams.period as string || '24h'
  
  // 기간/간격 계산
  let interval = '24 hours'
  let groupFormat = 'YYYY-MM-DD HH24:00'
  
  if (period === '1h') {
    interval = '1 hour'
    groupFormat = 'YYYY-MM-DD HH24:MI'
  } else if (period === '6h') {
    interval = '6 hours'
    groupFormat = 'YYYY-MM-DD HH24:00'
  } else if (period === '12h') {
    interval = '12 hours'
    groupFormat = 'YYYY-MM-DD HH24:00'
  } else if (period === '24h') {
    interval = '24 hours'
    groupFormat = 'YYYY-MM-DD HH24:00'
  } else if (period === '7d') {
    interval = '7 days'
    groupFormat = 'YYYY-MM-DD'
  } else if (period === '30d') {
    interval = '30 days'
    groupFormat = 'YYYY-MM-DD'
  }
  
  // 시간대별 집계 (anomaly_logs 테이블이 없으면 빈 배열 반환)
  let rows: any[] = []
  try {
    rows = await query<any>(`
      SELECT 
        to_char(detected_at, '${groupFormat}') as time_slot,
        SUM(CASE WHEN level = 'warning' THEN 1 ELSE 0 END) as warning,
        SUM(CASE WHEN level = 'danger' THEN 1 ELSE 0 END) as danger
      FROM anomaly_logs
      WHERE detect_type = $1
        AND detected_at >= NOW() - INTERVAL '${interval}'
      GROUP BY time_slot
      ORDER BY time_slot ASC
    `, [type])
  } catch (e) {
    // 테이블이 없으면 빈 배열
    rows = []
  }
  
  // 시간 포맷 변환
  const data = rows.map(r => ({
    time: formatTimeLabel(r.time_slot, period),
    warning: Number(r.warning),
    danger: Number(r.danger)
  }))
  
  return {
    data,
    type,
    period,
    timestamp: new Date().toISOString()
  }
})

function formatTimeLabel(timeSlot: string, period: string): string {
  if (!timeSlot) return ''
  
  if (period === '7d' || period === '30d') {
    const parts = timeSlot.split('-')
    return `${parts[1]}/${parts[2]}`
  } else {
    const parts = timeSlot.split(' ')
    if (parts.length === 2) {
      return parts[1].substring(0, 5)
    }
    return timeSlot.substring(11, 16)
  }
}