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Dosya Düzenle: faqAPI.php

<?php
/**
 * includes/faq_api.php — FREE AI proxy using Google Gemini API
 * ─────────────────────────────────────────────────────────────
 * FREE TIER LIMITS (no credit card needed):
 *   • gemini-1.5-flash : 15 req/min · 1,000,000 tokens/day · 100% FREE
 *
 * HOW TO GET YOUR FREE KEY:
 *   1. Go to https://aistudio.google.com/app/apikey
 *   2. Sign in with any Google account
 *   3. Click "Create API Key" — done, it's free
 *   4. Paste it below as GEMINI_API_KEY
 */

/* ── CONFIG ── */
define('GEMINI_API_KEY', 'AQ.Ab8RN6KNdKKleWu8qTQEipvVYxvHbFjLxdQWFjtu7Ytaazhu5Q');   // ← paste your free key
define('GEMINI_MODEL',   'gemini-1.5-flash');            // free tier model
define('MAX_TOKENS',      1024);
define('MAX_HISTORY',     20);    // max message pairs kept
define('MAX_CHARS',       500);   // mirror textarea maxlength

/* ── System prompt + knowledge base ── */
define('SYSTEM_PROMPT', 'You are the official AI FAQ Assistant for Mangaldai College (Autonomous), Mangaldai, Darrang, Assam, India.

Answer ONLY using the knowledge base below. Never make up information.

=== KNOWLEDGE BASE ===

ABOUT:
- Mangaldai College (Autonomous), Mangaldai, Darrang, Assam — Est. 1951
- Affiliated: Gauhati University | NAAC Accredited | DBT Star College
- Principal: Dr. Kamala Kanta Borah (M.Sc., Ph.D.)
- Motto: Tamaso Ma Jyotirgamaya
- Email: mangaldaicollege@gmail.com | Phone: +91 86380 67481
- Office: Mon–Sat, 9 AM – 4 PM

PROGRAMMES:
- HS: Arts, Science, Commerce
- UG (NEP 2020 FYUGP): BA, BSc, BCA, B.Voc
- PG: MA Assamese
- Integrated: ITEP (itep.mangaldaicollege.org)
- Add-on / Certificate courses: addonCourse.php

BSc DEPARTMENTS (7): Physics, Chemistry, Mathematics, Botany, Zoology, Statistics, Computer Science — all offer Major & Minor

ADMISSION:
- Portal: https://assamshesp.samarth.edu.in/index.php/site/login
- Academic year: 2026–27
- Fee structure: pdf/fees Sturcture 23-24.pdf
- Fee Refund Policy: Fee_Refund_Policy.php
- Exact dates: check Notices section or admission portal (changes yearly)

IQAC & ACCREDITATION:
- IQAC: iqac.php | NAAC SSR: ssr.php | NIRF: nirf.php | Feedback: feedback.php

FACILITIES:
- Library: central library, e-resources, N-LIST/INFLIBNET, OPAC (mangaldaicollege-opac.in)
- Smart Classrooms, Science Labs (DBT Star equipped)
- Girls Hostel (gh.php), Botanical Garden, Sports, Canteen
- UGC Network Centre, e-Content Centre, BIO-TECH Hub
- SWAYAM-NPTEL Local Chapter, GUCDOE, KKHSOU Study Centre

STUDENT SERVICES:
- Scholarships: scholarship.php | Old Papers: question.php
- Study Material: studyMatAll.php | Handbook: studenthandbook.php
- Mentoring: mentor.php | Career Cell: career.php
- Alumni: alumni.php | Union Body: unionBody.php

NCC & NSS: Active units — camps, blood donation, environment programs

COMMITTEES: Anti-Ragging, ICC, Equal Opportunity, Sexual Harassment Prevention,
Grievance Redressal, R&D Cell, SEDGs, Library Management, Vigilance, Website Committee

NEWSLETTER: Issue I — upload/Newsletter Issue1New.pdf | Issue II — upload/Newsletter Issue2New.pdf

COURSES & SYLLABUS: courses_available.php | POs & COs: pdf/MC_POs_COs.pdf

ADMINISTRATION: Governing Body — gb.php | Organogram — organogram.php | RTI — RTI Declaration Mangaldai College.pdf

AICTE data: aictedata.php | Events: event.php

=== END KNOWLEDGE BASE ===

RULES:
1. Answer ONLY from the knowledge base above.
2. Be friendly, concise, and professional.
3. Use bullet points (•) for lists.
4. Mention source pages when helpful (e.g., "see scholarship.php").
5. If not in the knowledge base, say exactly: "I could not find this information on the website. Please contact the college office at +91 86380 67481 or email mangaldaicollege@gmail.com."
6. Never guess fees, dates, or contact details not listed above.
7. Do not answer questions unrelated to Mangaldai College.
8. If user greets you, respond warmly and offer help.');

/* ── Headers ── */
header('Content-Type: application/json; charset=utf-8');
header('X-Content-Type-Options: nosniff');

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['error' => 'Method not allowed']);
    exit;
}

/* ── Parse request ── */
$raw  = file_get_contents('php://input');
$body = json_decode($raw, true);

if (!$body || !isset($body['messages']) || !is_array($body['messages'])) {
    http_response_code(400);
    echo json_encode(['error' => 'Invalid request']);
    exit;
}

/* ── Build Gemini conversation history ── */
// Gemini uses "contents" array with role "user" / "model"
$contents = [];
$msgs = array_slice($body['messages'], -MAX_HISTORY);

foreach ($msgs as $msg) {
    if (!isset($msg['role'], $msg['content'])) continue;
    $role    = ($msg['role'] === 'assistant') ? 'model' : 'user';
    $content = mb_substr(trim((string)$msg['content']), 0, MAX_CHARS * 4);
    if ($content === '') continue;
    $contents[] = [
        'role'  => $role,
        'parts' => [['text' => $content]],
    ];
}

if (empty($contents)) {
    http_response_code(400);
    echo json_encode(['error' => 'No valid messages']);
    exit;
}

/* ── Gemini API payload ── */
$payload = json_encode([
    'system_instruction' => [
        'parts' => [['text' => SYSTEM_PROMPT]]
    ],
    'contents'           => $contents,
    'generationConfig'   => [
        'maxOutputTokens' => MAX_TOKENS,
        'temperature'     => 0.3,   // lower = more factual
    ],
]);

/* ── Call Gemini API ── */
$url = 'https://generativelanguage.googleapis.com/v1beta/models/'
     . GEMINI_MODEL
     . ':generateContent?key='
     . GEMINI_API_KEY;

$ch = curl_init($url);
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST           => true,
    CURLOPT_POSTFIELDS     => $payload,
    CURLOPT_TIMEOUT        => 30,
    CURLOPT_HTTPHEADER     => ['Content-Type: application/json'],
]);

$result   = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$curlErr  = curl_error($ch);
curl_close($ch);

if ($curlErr) {
    http_response_code(502);
    echo json_encode(['error' => 'Could not reach AI service. Try again.']);
    exit;
}

/* ── Parse Gemini response & convert to simple format ── */
$gemini = json_decode($result, true);

// Extract reply text
$replyText = '';
if (isset($gemini['candidates'][0]['content']['parts'][0]['text'])) {
    $replyText = $gemini['candidates'][0]['content']['parts'][0]['text'];
} elseif (isset($gemini['error']['message'])) {
    http_response_code(500);
    echo json_encode(['error' => $gemini['error']['message']]);
    exit;
}

/* ── Return in a simple format the JS can read ── */
echo json_encode([
    'reply' => $replyText,
    'model' => GEMINI_MODEL,
]);

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