<?php

namespace App\Services\Sms;

use App\Models\CalendarReminder;
use App\Models\SmsCampaign;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

class SmsCampaignReconciler
{
    public function __construct(private readonly OvhSmsProvider $provider) {}

    public function reconcile(SmsCampaign $campaign): SmsCampaign
    {
        try {
            $messages = $this->provider->outgoing($campaign);
        } catch (SmsProviderException $exception) {
            Log::warning('SMS campaign verification unavailable.', [
                'sms_campaign_id' => $campaign->id,
                'reason' => $exception->getMessage(),
            ]);

            return $campaign;
        }

        return $this->applyOutgoing($campaign, $messages);
    }

    /** @param array<int, array<string, mixed>> $messages */
    public function applyOutgoing(SmsCampaign $campaign, array $messages): SmsCampaign
    {
        return DB::transaction(function () use ($campaign, $messages): SmsCampaign {
            $campaign = SmsCampaign::query()->lockForUpdate()->findOrFail($campaign->id);

            if (! in_array($campaign->status, ['uncertain', 'sending'], true)) {
                return $campaign;
            }

            $byNumber = [];
            foreach ($messages as $message) {
                if (($message['tag'] ?? null) !== $campaign->provider_tag
                    || ($message['message'] ?? null) !== $campaign->message
                    || empty($message['id']) || empty($message['receiver'])) {
                    continue;
                }

                $byNumber[(string) $message['receiver']] = $message;
            }

            foreach ($campaign->deliveries()->whereIn('status', ['uncertain', 'queued'])->get() as $delivery) {
                $message = $byNumber[$delivery->number] ?? null;
                if ($message === null) {
                    $delivery->update(['status' => 'uncertain']);

                    continue;
                }

                // "sent" records acceptance by OVH, not delivery to the handset.
                $delivery->update([
                    'status' => 'sent',
                    'provider_message_id' => (string) $message['id'],
                    'provider_response' => $message,
                    'error_message' => null,
                    'sent_at' => $message['sentAt'] ?? $message['creationDatetime'] ?? now(),
                ]);
            }

            $sentCount = $campaign->deliveries()->where('status', 'sent')->count();
            $failedCount = $campaign->deliveries()->where('status', 'failed')->count();
            $unconfirmed = $campaign->deliveries()->whereIn('status', ['uncertain', 'queued'])->exists();
            $status = $unconfirmed ? 'uncertain' : ($failedCount > 0 ? ($sentCount > 0 ? 'partial' : 'failed') : 'sent');
            $campaign->update([
                'status' => $status,
                'sent_count' => $sentCount,
                'failed_count' => $failedCount,
                'sent_at' => $campaign->deliveries()->where('status', 'sent')->min('sent_at'),
                'response_payload' => ['verification' => 'OVH outgoing history', 'confirmed_recipients' => $sentCount],
                'error_message' => $unconfirmed
                    ? 'Certains envois restent a verifier chez OVH. Aucun renvoi automatique ; ne pas renvoyer cette campagne.'
                    : null,
            ]);

            CalendarReminder::query()->where('sms_campaign_id', $campaign->id)->where('status', 'uncertain')->update([
                'status' => $status === 'uncertain' ? 'uncertain' : ($sentCount > 0 ? 'sent' : 'failed'),
                'last_error' => $campaign->error_message,
                'sent_at' => $campaign->sent_at,
            ]);

            Log::info('SMS campaign verified against OVH history.', [
                'sms_campaign_id' => $campaign->id,
                'sent_count' => $sentCount,
                'status' => $status,
            ]);

            return $campaign->fresh(['deliveries', 'user']);
        });
    }
}