<?php

namespace humhub\modules\donations\services;

use humhub\modules\donations\events\DonationSettlementEvent;
use humhub\modules\donations\models\DonationGoal;
use humhub\modules\donations\models\DonationTransaction;
use yii\base\Event;

class DonationSettlementService
{
    public const EVENT_AFTER_SUCCEEDED = 'afterSucceeded';
    public const EVENT_AFTER_REFUNDED = 'afterRefunded';

    public function markSucceededAndApply(DonationTransaction $transaction, array $metadata = []): void
    {
        $payload = $this->decodeMetadata($transaction->metadata_json);
        $applied = !empty($payload['goal_amount_applied']);
        $goal = null;

        if ((int)$transaction->goal_id > 0) {
            $goal = DonationGoal::findOne([
                'id' => (int)$transaction->goal_id,
                'contentcontainer_id' => (int)$transaction->contentcontainer_id,
            ]);
        }

        if (!$applied) {
            if ($goal instanceof DonationGoal) {
                $goal->current_amount = round((float)$goal->current_amount + (float)$transaction->amount, 2);
                $goal->save(false);

                $payload['goal_amount_applied'] = 1;
                $payload['goal_amount_applied_at'] = date('c');
                $payload['goal_amount_applied_value'] = (float)$transaction->amount;
            }
        }

        foreach ($metadata as $key => $value) {
            $payload[$key] = $value;
        }

        $transaction->status = DonationTransaction::STATUS_SUCCEEDED;
        $event = new DonationSettlementEvent();
        $event->transaction = $transaction;
        $event->goal = $goal;
        $event->payload = $payload;

        Event::trigger(self::class, self::EVENT_AFTER_SUCCEEDED, $event);
        if (is_array($event->payload)) {
            $payload = $event->payload;
        }

        $transaction->metadata_json = json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        $transaction->save(false);
    }

    public function markRefundedAndRevert(DonationTransaction $transaction, array $metadata = []): void
    {
        $payload = $this->decodeMetadata($transaction->metadata_json);
        $applied = !empty($payload['goal_amount_applied']);
        $reverted = !empty($payload['goal_amount_reverted']);
        $goal = null;

        if ((int)$transaction->goal_id > 0) {
            $goal = DonationGoal::findOne([
                'id' => (int)$transaction->goal_id,
                'contentcontainer_id' => (int)$transaction->contentcontainer_id,
            ]);
        }

        if ($applied && !$reverted) {
            if ($goal instanceof DonationGoal) {
                $nextAmount = round((float)$goal->current_amount - (float)$transaction->amount, 2);
                $goal->current_amount = max(0.0, $nextAmount);
                $goal->save(false);

                $payload['goal_amount_reverted'] = 1;
                $payload['goal_amount_reverted_at'] = date('c');
                $payload['goal_amount_reverted_value'] = (float)$transaction->amount;
            }
        }

        foreach ($metadata as $key => $value) {
            $payload[$key] = $value;
        }

        $transaction->status = DonationTransaction::STATUS_REFUNDED;
        $event = new DonationSettlementEvent();
        $event->transaction = $transaction;
        $event->goal = $goal;
        $event->payload = $payload;

        Event::trigger(self::class, self::EVENT_AFTER_REFUNDED, $event);
        if (is_array($event->payload)) {
            $payload = $event->payload;
        }

        $transaction->metadata_json = json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        $transaction->save(false);
    }

    private function decodeMetadata(?string $json): array
    {
        $data = json_decode((string)$json, true);
        return is_array($data) ? $data : [];
    }
}