<?php

namespace App\Http\Receivers;

use Illuminate\Http\Request;
use Illuminate\Support\Collection;
use Illuminate\Support\Str;
use Receiver\Providers\AbstractProvider;

class XeroProvider extends AbstractProvider
{
    public function verify(Request $request): bool
    {
        if (! is_string($this->secret) || empty($this->secret)) {
            throw new \Exception('Xero webhook secret not found');
        }

        // Compute the payload with HMACSHA256 with base64 encoding
        $computedSignatureKey = base64_encode(
            hash_hmac('sha256', (string) $request->getContent(), $this->secret, true)
        );

        return hash_equals($computedSignatureKey, $request->header('X_XERO_SIGNATURE') ?? '');
    }

    public function getEvent(Request $request): string
    {
        $events = $request->collect('events');

        /**
         * For Xeros' 'Intent to receive' validation.
         * @see https://developer.xero.com/documentation/guides/webhooks/configuring-your-server/#intent-to-receive
         */
        if ($events->isEmpty()) {
            return '';
        }

        /** @var array $firstEvent */
        $firstEvent = $request->collect('events')->first();

        // We never use this but we have to return a string
        return Str::lower("{$firstEvent['eventCategory']}.{$firstEvent['eventType']}");
    }

    protected function handle(): void
    {
        /** @var Collection<string, Collection> $events */
        $events = $this->request
            ->collect('events')
            ->mapToGroups(fn ($item, $key) => [Str::lower("{$item['eventCategory']}.{$item['eventType']}") => $item]);

        foreach ($events as $eventName => $data) {
            $class = $this->getClass($eventName);

            if (class_exists($class)) {
                $instance = new $class($eventName, $data->toArray());

                $this->dispatched = dispatch($instance);
            }
        }
    }
}

protected function handle(): static
{
    collect($this->request->collect('events'))->each(function ($event) {
        $data = $event['data'];
        $class = $this->getClass($event = $event['name']);

        if (class_exists($class)) {
            $class::dispatch($event, $data);
            $this->dispatched = true;
        }
    });

    return $this;
}