<?php

namespace App\Domains\Integration\Services;

use Exception;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;
use Carbon\Carbon;

class TelepagosIntegrationService extends BaseIntegrationService
{
    /**
     * TelepagosIntegrationService constructor.
     *
     * @param string $integrationCode
     */
    public function __construct(string $integrationCode = 'telepagos')
    {
        // Force homologation code if not in production and using default
        if ($integrationCode === 'telepagos' && !app()->environment('production')) {
            $integrationCode = 'telepagos_homo';
        }

        $this->integrationCode = $integrationCode;
    }

    /**
     * Get the headers for Telepagos integration.
     *
     * @return array
     * @throws Exception
     */
    public function getHeaders(): array
    {
        return [
            'Authorization' => 'Bearer ' . $this->getToken(),
            'Content-Type' => 'application/json',
            'Accept' => 'application/json',
        ];
    }

    /**
     * Get a valid token, either from cache or by performing a login.
     *
     * @return string
     * @throws Exception
     */
    public function getToken(): string
    {
        if (!$this->tenantIntegration) {
            throw new Exception("Tenant integration is not loaded. Call forTenant() first.");
        }

        $cacheKey = "integration_token:{$this->tenantCode}:{$this->integrationCode}";

        $token = Cache::get($cacheKey);

        if ($token) {
            return $token;
        }

        return $this->login();
    }

    /**
     * Authenticate with Telepagos and cache the returned token.
     *
     * @return string
     * @throws Exception
     */
    public function login(): string
    {
        $username = $this->getIntegrationSetting('username');
        $password = $this->getIntegrationSetting('password');

        if (empty($username) || empty($password)) {
            throw new Exception("Missing username or password in Telepagos integration settings.");
        }

        $url = $this->getUrl('/v2/auth/token');

        $response = Http::post($url, [
            'username' => $username,
            'password' => $password,
        ]);

        if ($response->failed() || $response->json('status') !== 'ok') {
            throw new Exception("Telepagos authentication failed: " . ($response->json('message') ?? $response->body()));
        }

        $token = $response->json('token');
        $expiresAtStr = $response->json('expires_at');

        if (!$token || !$expiresAtStr) {
            throw new Exception("Telepagos authentication response is missing token or expires_at.");
        }

        $expiresAt = Carbon::parse($expiresAtStr);
        // Calculate TTL and subtract a buffer of 60 seconds
        $ttlSeconds = max(1, $expiresAt->diffInSeconds(now()) - 60);

        $cacheKey = "integration_token:{$this->tenantCode}:{$this->integrationCode}";
        Cache::put($cacheKey, $token, $ttlSeconds);

        return $token;
    }

    /**
     * Clear the cached token.
     *
     * @return void
     */
    public function clearToken(): void
    {
        $cacheKey = "integration_token:{$this->tenantCode}:{$this->integrationCode}";
        Cache::forget($cacheKey);
    }
}