<?php

namespace App\Services;

use App\Core\RedisClient;

class NabehService
{
    private string $authUrl;
    private string $sendUrl;
    private string $email;
    private string $password;

    public function __construct()
    {
        $this->authUrl  = (string)getenv('NABEH_AUTH_URL');
        $this->sendUrl  = (string)getenv('NABEH_SEND_URL');
        $this->email    = (string)getenv('NABEH_EMAIL');
        $this->password = (string)getenv('NABEH_PASSWORD');

        // Strict validation: NO fallback defaults allowed
        $missing = [];
        if (empty($this->authUrl))  $missing[] = 'NABEH_AUTH_URL';
        if (empty($this->sendUrl))  $missing[] = 'NABEH_SEND_URL';
        if (empty($this->email))    $missing[] = 'NABEH_EMAIL';
        if (empty($this->password)) $missing[] = 'NABEH_PASSWORD';

        if (!empty($missing)) {
            throw new \RuntimeException("Nabeh Service configuration error: Missing environment variable(s): " . implode(', ', $missing));
        }
    }

    /**
     * Retrieve Nabeh JWT Bearer Token, caching it in Redis for 24 hours.
     */
    public function getBearerToken(): ?string
    {
        // 1. Try fetching from Redis first
        try {
            $redis = RedisClient::getInstance();
            $cachedToken = $redis->get('nabeh_bearer_token');
            if ($cachedToken) {
                return (string)$cachedToken;
            }
        } catch (\Exception $e) {
            error_log("⚠️ [Nabeh Auth Redis] Error reading token: " . $e->getMessage());
        }

        // 2. Token not cached, authenticate via Nabeh Login API
        $payload = json_encode([
            'email'    => $this->email,
            'password' => $this->password,
        ]);

        $ch = curl_init($this->authUrl);
        curl_setopt_array($ch, [
            CURLOPT_POST           => true,
            CURLOPT_POSTFIELDS     => $payload,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT        => 15,
            CURLOPT_HTTPHEADER     => ['Content-Type: application/json'],
        ]);

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

        if ($curlError) {
            error_log("❌ [Nabeh Auth cURL Error] " . $curlError);
            return null;
        }

        if ($httpCode === 200 && $response) {
            $decoded = json_decode($response, true);
            $token = $decoded['token'] ?? $decoded['message']['token'] ?? $decoded['jwt'] ?? $decoded['access_token'] ?? null;

            if ($token) {
                // Cache token in Redis for 24h (86400 seconds)
                try {
                    $redis = RedisClient::getInstance();
                    $redis->setex('nabeh_bearer_token', 86400, (string)$token);
                    error_log("✅ [Nabeh Auth] Token cached in Redis successfully.");
                } catch (\Exception $e) {
                    error_log("⚠️ [Nabeh Auth Redis Cache Save] Error saving token: " . $e->getMessage());
                }
                return (string)$token;
            }
        }

        error_log("❌ [Nabeh Auth Login Failed] Code: {$httpCode} | Response: {$response}");
        return null;
    }

    /**
     * Send OTP via Nabeh JWT Auth Gateway (WhatsApp Image/Text OTP)
     */
    public function sendOtp(string $receiver, string $otp, string $method = 'image', string $appName = 'منصة صَقِل'): array
    {
        $bearerToken = $this->getBearerToken();
        if (!$bearerToken) {
            return [
                'success' => false,
                'error'   => 'فشل الحصول على توكن المصادقة من منصة نبيه. تأكد من صحة NABEH_EMAIL و NABEH_PASSWORD.'
            ];
        }

        $phoneRaw = preg_replace('/\D+/', '', $receiver);
        $type = in_array($method, ['text', 'voice', 'image'], true) ? $method : 'image';

        // 1. First attempt with image
        $result = $this->attemptSend($phoneRaw, $type, $otp, $appName, $bearerToken);
        if ($result['success']) {
            return $result;
        }

        // 2. Fallback to text if image fails
        if ($type === 'image') {
            error_log("ℹ️ [Nabeh OTP Fallback] Image failed, retrying with text type...");
            return $this->attemptSend($phoneRaw, 'text', $otp, $appName, $bearerToken);
        }

        return $result;
    }

    private function attemptSend(string $phone, string $type, string $otp, string $appName, string $bearerToken): array
    {
        $payload = json_encode([
            'phone'   => $phone,
            'type'    => $type,
            'code'    => $otp,
            'message' => "رمز التحقق الخاص بك لمنصة {$appName} هو: *{$otp}* \n الرجاء عدم مشاركته مع أي شخص لحماية حسابك.",
        ]);

        $ch = curl_init($this->sendUrl);
        curl_setopt_array($ch, [
            CURLOPT_POST           => true,
            CURLOPT_POSTFIELDS     => $payload,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT        => 15,
            CURLOPT_HTTPHEADER     => [
                'Content-Type: application/json',
                "Authorization: Bearer {$bearerToken}",
            ],
        ]);

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

        if ($curlError) {
            return [
                'success'  => false,
                'error'    => 'cURL Connection Error: ' . $curlError,
                'response' => null
            ];
        }

        if ($httpCode === 200 && $response) {
            $decoded = json_decode($response, true);
            if ($decoded) {
                $statusStr = strtolower((string)($decoded['status'] ?? ''));
                $msgStr = strtolower((string)($decoded['message'] ?? ''));
                if (
                    !empty($decoded['success']) ||
                    in_array($statusStr, ['success', 'ok', 'true', '200', 'sent', 'queued', '1'], true) ||
                    ($decoded['status'] ?? false) === true ||
                    str_contains($msgStr, 'success') ||
                    str_contains($msgStr, 'sent') ||
                    str_contains($msgStr, 'تم')
                ) {
                    return [
                        'success'  => true,
                        'message'  => 'تم إرسال رمز التحقق بنجاح عبر الواتساب',
                        'raw'      => $decoded
                    ];
                }
            }
        }

        return [
            'success'   => false,
            'http_code' => $httpCode,
            'error'     => 'Nabeh Gateway rejected OTP request',
            'response'  => $response
        ];
    }
}