<?php

namespace App\Services\Pay;

use Illuminate\Http\Client\Response;
use Illuminate\Support\Facades\Http;
use RuntimeException;

/**
 * Client for the platform Ladill Pay HTTP API — checkout and settlement for
 * merchant↔buyer money. Provider is configured on the platform
 * (PAY_DEFAULT_PROVIDER); settlement lands via wallet or direct MoMo.
 */
class PayClient
{
    private function base(): string
    {
        return rtrim((string) config('pay.api_url'), '/');
    }

    private function token(): string
    {
        return (string) (config('pay.api_key') ?? '');
    }

    /** @param array<string,mixed> $payload */
    public function createCheckout(array $payload): array
    {
        $res = Http::withToken($this->token())->acceptJson()->timeout(15)->post($this->base().'/checkouts', $payload);

        return $this->jsonOrFail($res, 'Could not start checkout. Please try again.');
    }

    public function verify(string $reference): array
    {
        $res = Http::withToken($this->token())->acceptJson()->timeout(15)->post($this->base().'/checkouts/verify', [
            'reference' => $reference,
        ]);

        return $this->jsonOrFail($res, 'Could not verify payment. Please try again.');
    }

    public function show(string $reference): array
    {
        $res = Http::withToken($this->token())->acceptJson()->timeout(10)->get($this->base().'/orders/'.$reference);

        return $this->jsonOrFail($res, 'Could not load payment order.');
    }

    /** @return array<string,mixed> */
    private function jsonOrFail(Response $res, string $fallback): array
    {
        if ($res->failed()) {
            throw new RuntimeException($this->errorMessage($res, $fallback));
        }

        return (array) $res->json();
    }

    private function errorMessage(Response $res, string $fallback): string
    {
        $message = $res->json('error') ?? $res->json('message');
        if (is_array($message)) {
            $message = collect($message)->flatten()->first();
        }

        $message = trim((string) ($message ?? ''));

        return $message !== '' ? $message : $fallback;
    }
}