<?php
require_once __DIR__ . '/../ai/LocalAIApi.php';

if (!function_exists('app_translate_text')) {
    function app_translate_text(string $text, string $target): array
    {
        $cleanText = trim($text);
        $cleanTarget = strtolower(trim($target)) === 'en' ? 'en' : 'ar';

        if ($cleanText === '') {
            return [
                'success' => false,
                'error' => 'No text provided',
            ];
        }

        if (function_exists('mb_substr')) {
            $cleanText = mb_substr($cleanText, 0, 500);
        } else {
            $cleanText = substr($cleanText, 0, 500);
        }

        $skipAiUntil = isset($_SESSION['translation_ai_disabled_until']) ? (int) $_SESSION['translation_ai_disabled_until'] : 0;
        $shouldTryAi = $skipAiUntil <= time();
        $aiResult = [
            'success' => false,
            'error' => 'AI translation unavailable',
            'provider' => 'ai',
        ];

        if ($shouldTryAi) {
            $aiResult = app_translate_text_with_ai($cleanText, $cleanTarget);
            if (!empty($aiResult['success']) && !empty($aiResult['translated'])) {
                unset($_SESSION['translation_ai_disabled_until']);
                return $aiResult;
            }

            $aiError = strtolower((string) ($aiResult['error'] ?? ''));
            if ($aiError !== '' && (strpos($aiError, '401') !== false || strpos($aiError, 'unauthorized') !== false || strpos($aiError, 'timeout') !== false)) {
                $_SESSION['translation_ai_disabled_until'] = time() + 900;
            }
        }

        $fallbackResult = app_translate_text_with_google($cleanText, $cleanTarget);
        if (!empty($fallbackResult['success']) && !empty($fallbackResult['translated'])) {
            if (!empty($aiResult['error']) && $aiResult['error'] !== 'AI translation unavailable') {
                $fallbackResult['warning'] = (string) $aiResult['error'];
            }
            return $fallbackResult;
        }

        if (!empty($aiResult['error']) && $aiResult['error'] !== 'AI translation unavailable') {
            return $aiResult;
        }

        return $fallbackResult;
    }
}

if (!function_exists('app_translate_text_with_ai')) {
    function app_translate_text_with_ai(string $text, string $target): array
    {
        $prompt = "Translate the following product name to " . ($target === 'ar' ? 'Arabic' : 'English') . ". Return ONLY the translation, no extra text or explanations.\n\nText: " . $text;

        $resp = LocalAIApi::createResponse([
            'input' => [
                ['role' => 'system', 'content' => 'You are a translation assistant. You translate product names between English and Arabic. Keep brand names, sizes, numbers, and SKUs accurate. Return only the translated text.'],
                ['role' => 'user', 'content' => $prompt],
            ],
        ], [
            'poll_interval' => 1,
            'poll_timeout' => 12,
            'timeout' => 20,
        ]);

        if (!empty($resp['success'])) {
            $translated = trim(LocalAIApi::extractText($resp));
            if ($translated !== '') {
                return [
                    'success' => true,
                    'translated' => $translated,
                    'provider' => 'ai',
                ];
            }
        }

        return [
            'success' => false,
            'error' => (string) ($resp['error'] ?? 'AI translation failed'),
            'provider' => 'ai',
        ];
    }
}

if (!function_exists('app_translate_text_with_google')) {
    function app_translate_text_with_google(string $text, string $target): array
    {
        if (!function_exists('curl_init')) {
            return [
                'success' => false,
                'error' => 'Translation service unavailable: PHP cURL is missing',
                'provider' => 'fallback',
            ];
        }

        $query = http_build_query([
            'client' => 'gtx',
            'sl' => 'auto',
            'tl' => $target,
            'dt' => 't',
            'q' => $text,
        ]);
        $url = 'https://translate.googleapis.com/translate_a/single?' . $query;

        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT => 15,
            CURLOPT_CONNECTTIMEOUT => 5,
            CURLOPT_HTTPGET => true,
            CURLOPT_FAILONERROR => false,
            CURLOPT_HTTPHEADER => [
                'Accept: application/json',
                'User-Agent: Mozilla/5.0',
            ],
        ]);

        $body = curl_exec($ch);
        if ($body === false) {
            $error = curl_error($ch) ?: 'Unknown translation request error';
            curl_close($ch);
            return [
                'success' => false,
                'error' => $error,
                'provider' => 'fallback',
            ];
        }

        $status = (int) curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if ($status < 200 || $status >= 300 || $body === '' || $body === null) {
            return [
                'success' => false,
                'error' => 'Fallback translation request failed',
                'provider' => 'fallback',
            ];
        }

        $decoded = json_decode($body, true);
        if (!is_array($decoded) || empty($decoded[0]) || !is_array($decoded[0])) {
            return [
                'success' => false,
                'error' => 'Fallback translation returned an unexpected response',
                'provider' => 'fallback',
            ];
        }

        $parts = [];
        foreach ($decoded[0] as $segment) {
            if (is_array($segment) && isset($segment[0]) && is_string($segment[0])) {
                $parts[] = $segment[0];
            }
        }

        $translated = trim(implode('', $parts));
        if ($translated === '') {
            return [
                'success' => false,
                'error' => 'Fallback translation returned empty text',
                'provider' => 'fallback',
            ];
        }

        return [
            'success' => true,
            'translated' => $translated,
            'provider' => 'fallback',
        ];
    }
}