// server/supabase/functions/send-push/index.ts
// Expo Push Notification 발송 — 서버에서 push_tokens 조회 후 Expo API 호출.
// 호출 예시:
//   POST /functions/v1/send-push
//   { user_id: "...", title: "회의록 준비 완료", body: "..." }

import { corsHeaders, handleCorsPreflightRequest } from '../_shared/cors.ts'
import { requireUser, authErrorResponse, type AuthError } from '../_shared/auth.ts'
import { createServiceRoleClient } from '../_shared/quota.ts'

interface PushRequest {
  user_id: string
  title: string
  body: string
  data?: Record<string, unknown>
}

interface ExpoPushMessage {
  to: string
  sound?: 'default' | null
  title: string
  body: string
  data?: Record<string, unknown>
}

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

  if (req.method !== 'POST') {
    return new Response(JSON.stringify({ error: 'Method not allowed' }), {
      status: 405,
      headers: { ...corsHeaders, 'Content-Type': 'application/json' }
    })
  }

  try {
    // 호출자 인증 (현재 로그인된 user만 본인 또는 같은 팀 유저에게 발송 가능)
    const caller = await requireUser(req)
    const body = (await req.json()) as PushRequest

    if (!body.user_id || !body.title || !body.body) {
      return new Response(
        JSON.stringify({ error: 'user_id, title, body가 필요합니다' }),
        { status: 400, headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
      )
    }

    const serviceClient = createServiceRoleClient()

    // 권한 체크: 자기 자신에게 보내거나 같은 팀 멤버에게만
    if (body.user_id !== caller.id) {
      const { data: sharedTeams } = await serviceClient
        .from('team_members')
        .select('team_id')
        .eq('user_id', caller.id)

      const callerTeamIds = (sharedTeams ?? []).map((r: { team_id: string }) => r.team_id)

      if (callerTeamIds.length > 0) {
        const { data: targetMembership } = await serviceClient
          .from('team_members')
          .select('team_id')
          .eq('user_id', body.user_id)
          .in('team_id', callerTeamIds)

        if (!targetMembership || targetMembership.length === 0) {
          return new Response(
            JSON.stringify({ error: 'forbidden', message: '같은 팀 멤버가 아닙니다.' }),
            { status: 403, headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
          )
        }
      } else {
        return new Response(
          JSON.stringify({ error: 'forbidden' }),
          { status: 403, headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
        )
      }
    }

    // 대상 유저의 push tokens 조회
    const { data: tokens, error: tokenErr } = await serviceClient
      .from('push_tokens')
      .select('token, platform')
      .eq('user_id', body.user_id)

    if (tokenErr) {
      throw new Error(`토큰 조회 실패: ${tokenErr.message}`)
    }

    if (!tokens || tokens.length === 0) {
      return new Response(
        JSON.stringify({ sent: 0, message: 'push token 없음' }),
        { status: 200, headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
      )
    }

    // Expo Push API 호출 — 토큰 여러 개 배치로
    const messages: ExpoPushMessage[] = tokens.map((t: { token: string }) => ({
      to: t.token,
      sound: 'default',
      title: body.title,
      body: body.body,
      data: body.data ?? {}
    }))

    const expoResp = await fetch('https://exp.host/--/api/v2/push/send', {
      method: 'POST',
      headers: {
        Accept: 'application/json',
        'Accept-encoding': 'gzip, deflate',
        'Content-Type': 'application/json'
      },
      body: JSON.stringify(messages)
    })

    if (!expoResp.ok) {
      const errText = await expoResp.text()
      throw new Error(`Expo Push API 실패: ${expoResp.status} ${errText}`)
    }

    const result = (await expoResp.json()) as { data: Array<{ status: string; id?: string }> }

    return new Response(
      JSON.stringify({
        sent: messages.length,
        results: result.data
      }),
      { status: 200, headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
    )
  } catch (err) {
    if (err && typeof err === 'object' && 'status' in err && 'message' in err) {
      return authErrorResponse(err as AuthError, corsHeaders)
    }
    const message = err instanceof Error ? err.message : 'Unknown error'
    return new Response(JSON.stringify({ error: message }), {
      status: 500,
      headers: { ...corsHeaders, 'Content-Type': 'application/json' }
    })
  }
})