<?php

namespace App\Services;

/**
 * Meta Service
 * Wraps communication with Facebook Graph API for Messenger and Instagram Business.
 */
class MetaService
{
    /**
     * Send a text message response to Meta Graph API
     */
    public static function sendMessage(string $pageAccessToken, string $recipientPsid, string $messageText): bool
    {
        $url = "https://graph.facebook.com/v20.0/me/messages?access_token=" . urlencode($pageAccessToken);

        $payload = json_encode([
            'recipient' => ['id' => $recipientPsid],
            'messaging_type' => 'RESPONSE',
            'message' => ['text' => $messageText]
        ]);

        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'Content-Type: application/json'
        ]);
        curl_setopt($ch, CURLOPT_TIMEOUT, 10);

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

        if ($httpCode !== 200) {
            error_log("[MetaService Error] Failed to send message. HTTP Code: " . $httpCode . ", Response: " . $response);
            return false;
        }

        return true;
    }
}