<?php

namespace humhub\modules\donations\services;

use humhub\modules\donations\models\DonationGoal;
use humhub\modules\donations\models\DonationTransaction;
use humhub\modules\donations\notifications\DonationRefundedNotification;
use humhub\modules\donations\notifications\DonationSucceededNotification;
use humhub\modules\space\models\Space;
use humhub\modules\user\models\User;
use Yii;

class DonationNotificationService
{
    public function applySucceededNotifications(DonationTransaction $transaction, ?DonationGoal $goal, array $payload): array
    {
        if (!empty($payload['donation_succeeded_notifications_sent'])) {
            return $payload;
        }

        return $this->sendNotifications($transaction, $goal, $payload, 'succeeded');
    }

    public function applyRefundedNotifications(DonationTransaction $transaction, ?DonationGoal $goal, array $payload): array
    {
        if (!empty($payload['donation_refunded_notifications_sent'])) {
            return $payload;
        }

        return $this->sendNotifications($transaction, $goal, $payload, 'refunded');
    }

    private function sendNotifications(DonationTransaction $transaction, ?DonationGoal $goal, array $payload, string $mode): array
    {
        $space = Space::findOne(['contentcontainer_id' => (int)$transaction->contentcontainer_id]);
        if (!$space instanceof Space) {
            return $payload;
        }

        $goal = $goal instanceof DonationGoal ? $goal : DonationGoal::findOne([
            'id' => (int)$transaction->goal_id,
            'contentcontainer_id' => (int)$transaction->contentcontainer_id,
        ]);

        $goalTitle = $goal instanceof DonationGoal
            ? (string)$goal->title
            : Yii::t('DonationsModule.base', 'Donation Goal #{id}', ['id' => (int)$transaction->goal_id]);

        $amountLabel = number_format((float)$transaction->amount, 2) . ' ' . strtoupper((string)$transaction->currency);
        $originator = $this->findUser((int)$transaction->donor_user_id);

        $managerRecipients = $this->privilegedUsersForSpace($space);
        $donorRecipient = $originator;

        $sent = 0;
        $failures = 0;

        $send = function (User $recipient, bool $isDonorRecipient) use ($mode, $space, $goalTitle, $amountLabel, $originator, &$sent, &$failures): void {
            try {
                $notification = $mode === 'refunded'
                    ? DonationRefundedNotification::instance()
                    : DonationSucceededNotification::instance();

                if ($originator instanceof User && !$isDonorRecipient) {
                    $notification->from($originator);
                }

                $notification->spaceGuid = (string)$space->guid;
                $notification->goalTitle = $goalTitle;
                $notification->amountLabel = $amountLabel;
                $notification->payload([
                    'spaceGuid' => $notification->spaceGuid,
                    'goalTitle' => $notification->goalTitle,
                    'amountLabel' => $notification->amountLabel,
                ]);
                $notification->send($recipient);
                $sent++;
            } catch (\Throwable $e) {
                Yii::warning([
                    'message' => 'Could not send donation notification.',
                    'mode' => $mode,
                    'transaction_id' => (int)$transaction->id,
                    'recipient_id' => (int)$recipient->id,
                    'exception' => $e->getMessage(),
                ], 'donations.notifications');
                $failures++;
            }
        };

        if ($donorRecipient instanceof User) {
            $send($donorRecipient, true);
        }

        foreach ($managerRecipients as $recipient) {
            if ($donorRecipient instanceof User && (int)$recipient->id === (int)$donorRecipient->id) {
                continue;
            }

            $send($recipient, false);
        }

        $prefix = $mode === 'refunded' ? 'donation_refunded_notifications' : 'donation_succeeded_notifications';
        $payload[$prefix . '_sent'] = 1;
        $payload[$prefix . '_sent_count'] = $sent;
        $payload[$prefix . '_failed_count'] = $failures;
        $payload[$prefix . '_at'] = date('c');

        return $payload;
    }

    private function findUser(int $userId): ?User
    {
        if ($userId <= 0) {
            return null;
        }

        $user = User::findOne(['id' => $userId]);
        if (!$user instanceof User || (int)$user->status !== User::STATUS_ENABLED) {
            return null;
        }

        return $user;
    }

    private function privilegedUsersForSpace(Space $space): array
    {
        $recipients = [];

        foreach ($space->getPrivilegedGroupUsers() as $users) {
            foreach ($users as $user) {
                if ($user instanceof User && (int)$user->status === User::STATUS_ENABLED) {
                    $recipients[(int)$user->id] = $user;
                }
            }
        }

        if (empty($recipients)) {
            $owner = $space->getOwnerUser()->one();
            if ($owner instanceof User && (int)$owner->status === User::STATUS_ENABLED) {
                $recipients[(int)$owner->id] = $owner;
            }
        }

        return array_values($recipients);
    }
}