<?php
// StartupZiel API Proxy & Logger
error_reporting(0); 
header('Content-Type: application/json; charset=utf-8');

// ============================================================
//  ۱. کلید API خود را در خط پایین قرار دهید
// ============================================================
$apiKey = "AIzaSyBujbTaMrUTFgAY5yJDcIA53LgaLKxUBfU"; 
// ============================================================

$csvFile = 'ideas_database.csv';

if ($apiKey === "YOUR_API_KEY_HERE" || empty($apiKey)) {
    http_response_code(500);
    echo json_encode(['error' => ['message' => 'API Key is missing in api.php']]);
    exit;
}

// دریافت و اعتبارسنجی ورودی
$input = json_decode(file_get_contents('php://input'), true);
if (!$input || !isset($input['query']) || !isset($input['type'])) {
    http_response_code(400);
    echo json_encode(['error' => ['message' => 'Invalid Request']]);
    exit;
}

$userQuery = $input['query'];
$type = $input['type'];

// تنظیم دستورات (Prompts) برای هوش مصنوعی
$prompt = "";
switch ($type) {
    case 'ideas':
        $prompt = "You are a startup expert. Problem: '$userQuery'. Suggest 3 short startup idea titles *only*. Respond in Persian. Numbered list: 1. , 2. , 3.";
        break;
    case 'explainIdea':
        $prompt = "Explain this startup idea in Persian: '$userQuery'. Cover: Product, Target Audience, and Revenue Model in 2 paragraphs.";
        break;
    case 'analyzeIdea':
        $prompt = "Provide a professional SWOT analysis and list 3 main competitors for: '$userQuery'. Respond in Persian. Use bold headings.";
        break;
    case 'gtm':
        $prompt = "Suggest 3 creative Go-to-Market strategies for: '$userQuery'. Respond in Persian with bold titles.";
        break;
    case 'explainModel':
        $prompt = "Explain the business model '$userQuery' in Persian with one real example.";
        break;
}

// ارتباط با گوگل (Gemini API)
$url = "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash-preview-09-2025:generateContent?key=" . $apiKey;
$payload = [
    'contents' => [['parts' => [['text' => $userQuery]]]],
    'systemInstruction' => ['parts' => [['text' => $prompt]]]
];

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload));
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // حل مشکل SSL در هاست‌های اشتراکی

$response = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($httpCode != 200) {
    http_response_code(500);
    echo $response;
    exit;
}

// ذخیره‌سازی در دیتابیس CSV (فقط برای ایده‌های جدید)
if ($type === 'ideas') {
    $res = json_decode($response, true);
    $aiText = $res['candidates'][0]['content']['parts'][0]['text'] ?? '';
    if (!empty($aiText)) {
        $fp = fopen($csvFile, 'a');
        if ($fp) {
            if (filesize($csvFile) == 0) {
                fprintf($fp, chr(0xEF).chr(0xBB).chr(0xBF)); // BOM برای اکسل
                fputcsv($fp, ['Date', 'Type', 'Input', 'Result']);
            }
            date_default_timezone_set('Asia/Tehran');
            fputcsv($fp, [date('Y-m-d H:i:s'), $type, $userQuery, $aiText]);
            fclose($fp);
        }
    }
}

echo $response;
?>