<?php

namespace App\Services;

use Exception;
use Illuminate\Support\Facades\Log;

/**
 * MailerLite API Service
 * 
 * This service handles newsletter subscriptions via MailerLite API.
 * Requires both API key and Group ID to be configured.
 * 
 * Configuration required:
 * - MAILERLITE_API_KEY: Your MailerLite API key
 * - MAILERLITE_GROUP_ID: The ID of the group to subscribe users to
 */
class MailerLiteService
{
    protected $apiKey;
    protected $groupId;
    protected $baseUrl;

    public function __construct()
    {
        $this->apiKey = config('services.mailerlite.api_key');
        $this->groupId = config('services.mailerlite.group_id');
        $this->baseUrl = config('services.mailerlite.base_url');
    }

    /**
     * Subscribe a user to the newsletter
     *
     * @param string $email
     * @param string $name
     * @return bool
     */
    public function subscribeToNewsletter($email, $name = null)
    {
        if (!$this->isConfigured()) {
            Log::error('MailerLite API key or Group ID not configured');
            return false;
        }

        try {
            $data = [
                'email' => $email,
                'groups' => [$this->groupId],
                'status' => 'active',
            ];

            if ($name) {
                $data['fields'] = [
                    'name' => $name
                ];
            }

            $ch = curl_init();
            
            curl_setopt_array($ch, [
                CURLOPT_URL => $this->baseUrl . 'subscribers',
                CURLOPT_RETURNTRANSFER => true,
                CURLOPT_POST => true,
                CURLOPT_POSTFIELDS => json_encode($data),
                CURLOPT_HTTPHEADER => [
                    'Authorization: Bearer ' . $this->apiKey,
                    'Content-Type: application/json',
                    'Accept: application/json',
                ],
                CURLOPT_SSL_VERIFYPEER => true,
                CURLOPT_TIMEOUT => 30,
            ]);

            $response = curl_exec($ch);
            $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
            $error = curl_error($ch);
            
            curl_close($ch);

            if ($error) {
                Log::error('MailerLite cURL Error: ' . $error);
                return false;
            }

            // Success codes: 200 (updated) or 201 (created)
            if ($httpCode === 200 || $httpCode === 201) {
                return true;
            }

            // If subscriber already exists (422), consider it a success
            if ($httpCode === 422) {
                return true;
            }

            Log::error('MailerLite API Error: HTTP ' . $httpCode . ' - ' . $response);
            return false;

        } catch (Exception $e) {
            Log::error('MailerLite Service Error: ' . $e->getMessage());
            return false;
        }
    }

    /**
     * Check if the service is properly configured
     *
     * @return bool
     */
    public function isConfigured()
    {
        return !empty($this->apiKey) && !empty($this->groupId);
    }
}