<?php
// opus-arch-rlhf-feedback.php — Cap 5 RLHF feedback (Doctrine 87)
// Table PG + simple endpoint pour thumbs up/down + corrections
header('Content-Type: application/json');

$action = $_GET['action'] ?? $_POST['action'] ?? 'submit';

$pg_dsn = 'pgsql:host=10.1.0.3;dbname=adx_system';
$pg_user = 'admin';
$pg_pwd = 'admin123';

function get_db() {
    global $pg_dsn, $pg_user, $pg_pwd;
    try {
        $db = new PDO($pg_dsn, $pg_user, $pg_pwd, [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, PDO::ATTR_TIMEOUT => 3]);
        $db->exec('CREATE TABLE IF NOT EXISTS admin.user_feedback (id SERIAL PRIMARY KEY, ts TIMESTAMPTZ DEFAULT NOW(), session_id TEXT, trace_id INTEGER, intent TEXT, score INTEGER, correction TEXT, user_context TEXT)');
        return $db;
    } catch (Exception $e) {
        return null;
    }
}

if ($action === 'submit') {
    $db = get_db();
    if (!$db) {
        // Fallback to SQLite
        $sf = '/opt/weval-ops/rlhf-feedback.sqlite';
        $s = new SQLite3($sf);
        $s->exec('CREATE TABLE IF NOT EXISTS feedback(id INTEGER PRIMARY KEY AUTOINCREMENT, ts TEXT, session_id TEXT, intent TEXT, score INTEGER, correction TEXT)');
        $s->prepare('INSERT INTO feedback(ts, session_id, intent, score, correction) VALUES(?,?,?,?,?)')
          ->bindValue(1, date('c'))
          ->bindValue(2, $_POST['session_id'] ?? 'anon')
          ->bindValue(3, $_POST['intent'] ?? '')
          ->bindValue(4, (int)($_POST['score'] ?? 0))
          ->bindValue(5, $_POST['correction'] ?? '')
          ->execute();
        echo json_encode(['ok'=>true, 'storage'=>'sqlite_fallback']);
        exit;
    }
    $stmt = $db->prepare('INSERT INTO admin.user_feedback(session_id, trace_id, intent, score, correction, user_context) VALUES(?,?,?,?,?,?)');
    $stmt->execute([
        $_POST['session_id'] ?? 'anon',
        (int)($_POST['trace_id'] ?? 0),
        $_POST['intent'] ?? '',
        (int)($_POST['score'] ?? 0),
        $_POST['correction'] ?? '',
        $_POST['context'] ?? '',
    ]);
    echo json_encode(['ok'=>true, 'storage'=>'postgres']);
    exit;
}

if ($action === 'stats') {
    $db = get_db();
    if ($db) {
        $r = $db->query('SELECT intent, AVG(score) as avg_score, COUNT(*) as n FROM admin.user_feedback GROUP BY intent ORDER BY n DESC LIMIT 20');
        echo json_encode(['ok'=>true, 'stats'=>$r->fetchAll(PDO::FETCH_ASSOC)]);
    } else {
        echo json_encode(['ok'=>false, 'error'=>'db unreachable']);
    }
    exit;
}

echo json_encode(['ok'=>false, 'actions'=>['submit','stats']]);