<?php

namespace App\Http\Controllers;

use App\Http\Controllers\Concerns\ProxiesBackend;
use App\Services\BackendHttpClient;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;

class PromoController extends Controller
{
    use ProxiesBackend;

    public function __construct(private readonly BackendHttpClient $client)
    {
    }

    /**
     * Apply a promo code for the authenticated user via external API.
     * Request: { code: string }
     */
    public function apply(Request $request)
    {
        $data = Validator::make($request->all(), [
            'code' => ['required','string','max:64'],
        ])->validate();

        $code = strtoupper(trim($data['code']));
        try {
            $res = $this->client->post($request, '/promos/apply', [ 'code' => $code ]);
            if ($res->successful()) {
                $body = $res->json() ?: [];
                // Backward compatibility: ensure a message key exists
                if (!isset($body['message'])) {
                    $body['message'] = 'Promo applied successfully.';
                }
                // PromoControllerTest expects { success: true, message: '...' }
                return response()->json([
                    'success' => true,
                    'message' => $body['message']
                ], 200);
            }
            if ($res->clientError()) return $this->mapClientError($res);
            if ($res->serverError()) return $this->mapServiceUnavailable($res);
            return $this->mapBadGateway();
        } catch (\Throwable $e) {
            return $this->mapBadGateway('API server not reachable');
        }
    }
}