<?php

namespace App\Http\Controllers\Notification;

use App\Http\Controllers\Controller;
use App\Models\NotificationChannel;
use App\Models\NotificationDelivery;
use App\Models\NotificationWebhookLog;
use Illuminate\Http\Request;

class NotificationWebhookController extends Controller
{
    public function verify(Request $request, NotificationChannel $notificationChannel)
    {
        abort_unless(
            $request->query('hub.mode') === 'subscribe'
            && hash_equals((string) data_get($notificationChannel->credentials, 'webhook_verify_token'), (string) $request->query('hub.verify_token')),
            403,
        );

        return response($request->query('hub.challenge'), 200);
    }

    public function handle(Request $request, NotificationChannel $notificationChannel)
    {
        $valid = $this->validSignature($request, $notificationChannel);
        $payload = $request->all();
        $updates = $this->updates($payload);
        $log = NotificationWebhookLog::create([
            'notification_channel_id' => $notificationChannel->id,
            'provider' => $notificationChannel->provider,
            'event_type' => data_get($payload, 'entry.0.changes.0.field') ?? data_get($payload, 'event'),
            'provider_message_id' => data_get($updates, '0.id'),
            'signature_valid' => $valid,
            'payload' => $payload,
        ]);
        abort_unless($valid, 401);

        foreach ($updates as $update) {
            $delivery = NotificationDelivery::where('provider_message_id', $update['id'] ?? null)->first();
            if (! $delivery) {
                continue;
            }
            $status = match ($update['status'] ?? null) {
                'delivered' => 'delivered',
                'read' => 'read',
                'failed' => 'failed',
                default => 'sent',
            };
            $delivery->update([
                'status' => $status,
                'delivered_at' => $status === 'delivered' ? now() : $delivery->delivered_at,
                'read_at' => $status === 'read' ? now() : $delivery->read_at,
                'failed_at' => $status === 'failed' ? now() : $delivery->failed_at,
                'error_code' => data_get($update, 'errors.0.code'),
                'error_message' => data_get($update, 'errors.0.title'),
            ]);
        }
        $log->update(['processed_at' => now()]);

        return response()->json(['success' => true]);
    }

    private function validSignature(Request $request, NotificationChannel $channel): bool
    {
        if ($channel->channel === 'whatsapp_official') {
            $secret = data_get($channel->credentials, 'app_secret');
            $signature = $request->header('X-Hub-Signature-256');

            return $secret && $signature && hash_equals('sha256='.hash_hmac('sha256', $request->getContent(), $secret), $signature);
        }
        $secret = data_get($channel->credentials, 'webhook_secret');

        return $secret && hash_equals((string) $secret, (string) $request->header('X-Webhook-Secret'));
    }

    private function updates(array $payload): array
    {
        $statuses = data_get($payload, 'entry.0.changes.0.value.statuses');
        if (is_array($statuses)) {
            return $statuses;
        }

        return [[
            'id' => data_get($payload, 'message_id') ?? data_get($payload, 'id'),
            'status' => data_get($payload, 'status') ?? data_get($payload, 'event'),
            'errors' => data_get($payload, 'errors', []),
        ]];
    }
}