flux/supabase/functions/send-reminders/index.ts

import { serve } from "https://deno.land/std@0.168.0/http/server.ts"
import { createClient } from "https://esm.sh/@supabase/supabase-js@2"
import { JWT } from "https://esm.sh/google-auth-library@8.9.0"

const corsHeaders = {
  'Access-Control-Allow-Origin': '*',
  'Access-Control-Allow-Headers': 'authorization, x-client-info, apiKey, content-type',
}

serve(async (req) => {
  // Gestione CORS per sicurezza
  if (req.method === 'OPTIONS') {
    return new Response('ok', { headers: corsHeaders })
  }

  try {
    // 1. Inizializziamo il client Supabase con i poteri di Service Role (per scavalcare le RLS)
    const supabaseClient = createClient(
      Deno.env.get('SUPABASE_URL') ?? '',
      Deno.env.get('SUPABASE_SERVICE_ROLE_KEY') ?? ''
    )

    // 2. Recuperiamo la chiave di Firebase dai Secrets
    const firebaseSecret = Deno.env.get('FIREBASE_SERVICE_ACCOUNT')
    if (!firebaseSecret) throw new Error('Missing FIREBASE_SERVICE_ACCOUNT secret')
    const credentials = JSON.parse(firebaseSecret)

    // 3. Prepariamo l'autenticazione OAuth2 per Firebase HTTP v1
    const jwtClient = new JWT({
      email: credentials.client_email,
      key: credentials.private_key,
      scopes: ['https://www.googleapis.com/auth/firebase.messaging'],
    })
    const tokens = await jwtClient.getAccessToken()
    const fcmAccessToken = tokens.token

    // 4. Selezioniamo i reminder da inviare (trigger_at passato e non ancora inviati)
    const { data: reminders, error: fetchError } = await supabaseClient
      .from('task_reminders')
      .select('id, task_id, staff_id, channel, tasks(title, description)')
      .eq('channel', 'push')
      .eq('is_sent', false)
      .lte('trigger_at', new Date().toISOString())

    if (fetchError) throw fetchError

    if (!reminders || reminders.length === 0) {
      return new Response(JSON.stringify({ message: 'Nessun promemoria push da inviare.' }), {
        headers: { ...corsHeaders, 'Content-Type': 'application/json' },
        status: 200,
      })
    }

    // 5. Ciclo sui promemoria per raccogliere i token ed inviare
    for (const reminder of reminders) {
      const taskTitle = reminder.tasks?.title || 'Nuovo Task!';
      const taskBody = reminder.tasks?.description || 'Hai un task da completare.';

      // Preleviamo tutti i dispositivi registrati per questo specifico membro dello staff
      const { data: devices } = await supabaseClient
        .from('staff_devices')
        .select('fcm_token')
        .eq('staff_id', reminder.staff_id)

      if (devices && devices.length > 0) {
        // Spediamo la notifica a OGNI dispositivo associato all'utente
        for (const device of devices) {
          try {
            await fetch(
              `https://fcm.googleapis.com/v1/projects/${credentials.project_id}/messages:send`,
              {
                method: 'POST',
                headers: {
                  'Authorization': `Bearer ${fcmAccessToken}`,
                  'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                  message: {
                    token: device.fcm_token,
                    notification: {
                      title: taskTitle,
                      body: taskBody,
                    },
                    data: {
                      click_action: 'FLUTTER_NOTIFICATION_CLICK',
                      taskId: reminder.task_id, // Fondamentale per far scattare il Deep Link all'apertura!
                    },
                  },
                }),
              }
            )
          } catch (pushErr) {
            console.error(`Errore invio push al token ${device.fcm_token}:`, pushErr)
          }
        }
      }

      // 6. Segnamo il reminder come inviato per non riprocessarlo al prossimo giro
      await supabaseClient
        .from('task_reminders')
        .update({ is_sent: true, updated_at: new Date().toISOString() })
        .eq('id', reminder.id)
    }

    return new Response(JSON.stringify({ success: true, processed: reminders.length }), {
      headers: { ...corsHeaders, 'Content-Type': 'application/json' },
      status: 200,
    })

  } catch (error) {
    return new Response(JSON.stringify({ error: error.message }), {
      headers: { ...corsHeaders, 'Content-Type': 'application/json' },
      status: 500,
    })
  }
})