// server/supabase/functions/payple-webhook/index.ts
// Payple 웹훅 수신 — 결제완료, 취소, 빌링키 등록/해지 이벤트 처리.
// Payple 관리자에서 웹훅 URL을 등록해야 함.
// verify_jwt = false (외부 Payple 서버에서 호출)

import { corsHeaders, handleCorsPreflightRequest } from '../_shared/cors.ts'
import { createServiceRoleClient } from '../_shared/quota.ts'

interface PaypleWebhookPayload {
  PCD_PAY_RST: 'success' | 'error'
  PCD_PAY_CODE: string
  PCD_PAY_MSG: string
  PCD_PAY_TYPE: string
  PCD_PAY_OID: string
  PCD_PAY_TOTAL?: string
  PCD_PAYER_ID?: string
  PCD_PAYER_NO?: string       // 우리가 전달한 user_id
  PCD_PAY_CARDNAME?: string
  PCD_PAY_CARDNUM?: string
  PCD_PAY_TIME?: string       // 결제 시간 (YYYYMMDDHHMMSS)
  // 웹훅 이벤트 구분용
  PCD_PAY_WORK?: string       // 'AUTH' (등록), 'CERT' (등록+결제)
  PCD_PAYCANCEL_FLAG?: string  // 'Y' (취소 이벤트)
}

function jsonResponse(body: Record<string, unknown>, status = 200): Response {
  return new Response(JSON.stringify(body), {
    status,
    headers: { ...corsHeaders, 'Content-Type': 'application/json' },
  })
}

// @ts-expect-error — Deno 런타임 전역
Deno.serve(async (req: Request) => {
  const preflight = handleCorsPreflightRequest(req)
  if (preflight) return preflight

  if (req.method !== 'POST') {
    return jsonResponse({ error: 'Method not allowed' }, 405)
  }

  try {
    const payload = (await req.json()) as PaypleWebhookPayload
    const serviceClient = createServiceRoleClient()

    // 취소 이벤트
    if (payload.PCD_PAYCANCEL_FLAG === 'Y') {
      if (payload.PCD_PAY_RST === 'success' && payload.PCD_PAY_OID) {
        // 주문번호로 구독 찾아서 상태 변경
        const { data: sub } = await serviceClient
          .from('subscriptions')
          .select('user_id')
          .eq('payple_pay_oid', payload.PCD_PAY_OID)
          .maybeSingle()

        if (sub) {
          await serviceClient
            .from('subscriptions')
            .update({
              status: 'canceled',
              tier: 'free',
              updated_at: new Date().toISOString(),
            })
            .eq('user_id', sub.user_id)

          await serviceClient
            .from('profiles')
            .update({ tier: 'free', updated_at: new Date().toISOString() })
            .eq('id', sub.user_id)
        }
      }

      return jsonResponse({ received: true, event: 'cancel' })
    }

    // 결제 완료 이벤트
    if (payload.PCD_PAY_RST === 'success' && payload.PCD_PAYER_ID) {
      // payer_id(빌링키)로 구독 찾기
      const { data: sub } = await serviceClient
        .from('subscriptions')
        .select('user_id, tier')
        .eq('payple_payer_id', payload.PCD_PAYER_ID)
        .maybeSingle()

      if (sub && payload.PCD_PAY_OID) {
        // 주문번호 + 구독 기간 갱신 (정기결제 갱신 시)
        const now = new Date()
        const end = new Date(now)
        end.setMonth(end.getMonth() + 1)

        await serviceClient
          .from('subscriptions')
          .update({
            payple_pay_oid: payload.PCD_PAY_OID,
            status: 'active',
            current_period_start: now.toISOString(),
            current_period_end: end.toISOString(),
            updated_at: now.toISOString(),
          })
          .eq('user_id', sub.user_id)
      }

      return jsonResponse({ received: true, event: 'payment_complete' })
    }

    // 그 외 이벤트는 로깅만
    return jsonResponse({ received: true, event: 'unknown' })
  } catch (err) {
    const message = err instanceof Error ? err.message : 'Unknown error'
    return jsonResponse({ error: message }, 500)
  }
})