<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);

require __DIR__ . "/../config/connect.php"; // koneksi PDO
require __DIR__ . "/../config/gpt_ai.php"; // koneksi PDO

$action = $_GET['action'] ?? 'list';
$id_server = isset($_GET['i']) ? $_GET['i'] : 0;

if ($action === 'list') {
    $limit = isset($_POST['length']) ? intval($_POST['length']) : 20;
    $start = isset($_POST['start']) ? intval($_POST['start']) : 0;

    // pecah id server jadi array aman
    $ids = array_filter(array_map('intval', explode(',', $id_server)));
    $placeholders = implode(',', array_fill(0, count($ids), '?'));

    // hitung total data distinct topik
    $stmt = $pdo->prepare("SELECT COUNT(DISTINCT topik) 
                           FROM chat_topik 
                           WHERE id_data_server IN ($placeholders)");
    $stmt->execute($ids);
    $totalData = $stmt->fetchColumn();

    // ambil data unik berdasarkan topik (ambil id terbesar per topik)
    $stmt = $pdo->prepare("
        SELECT ct.id, ct.topik, ct.deskripsi
        FROM chat_topik ct
        INNER JOIN (
            SELECT topik, MAX(id) AS max_id
            FROM chat_topik
            WHERE id_data_server IN ($placeholders)
            GROUP BY topik
        ) tmax ON ct.id = tmax.max_id
        ORDER BY ct.id DESC
        LIMIT ?, ?
    ");

    // binding ids dulu
    $i = 1;
    foreach ($ids as $id) {
        $stmt->bindValue($i++, $id, PDO::PARAM_INT);
    }
    // binding limit
    $stmt->bindValue($i++, $start, PDO::PARAM_INT);
    $stmt->bindValue($i++, $limit, PDO::PARAM_INT);

    $stmt->execute();

    $data = [];
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
        $data[] = [
            $row['topik'],
            $row['deskripsi'],
            ["id" => $row['id']]
        ];
    }

    echo json_encode([
        "draw" => intval($_POST['draw'] ?? 1),
        "recordsTotal" => intval($totalData),
        "recordsFiltered" => intval($totalData),
        "data" => $data
    ]);
    exit;
}


if ($action === 'detail') {
    $id = intval($_POST['id'] ?? 0);
    $stmt = $pdo->prepare("SELECT id, deskripsi, topik FROM chat_topik WHERE id = ?");
    $stmt->execute([$id]);
    $row = $stmt->fetch(PDO::FETCH_ASSOC);
    echo json_encode($row ?: []);
    exit;
}

if ($action === 'save') {
    $id = intval($_POST['id'] ?? 0);
    $deskripsi = trim($_POST['deskripsi'] ?? '');
    $ids = array_filter(array_map('intval', explode(',', $_GET['i'] ?? '0')));

    if ($deskripsi === '' || empty($ids)) {
        echo json_encode(["status" => "error", "msg" => "Data tidak valid"]);
        exit;
    }

    // buat metadata dari GPT
    $payload = [
        "model" => "gpt-3.5-turbo",
        "messages" => [
            ["role" => "system", "content" => "Tolong rubah kalimat berikut menjadi metadata berbentuk JSON."],
            ["role" => "user", "content" => $deskripsi]
        ],
        "temperature" => 0.0
    ];

    $GPT = new Gpt_Ai_Api();
    $metadata = $GPT->call_openai($payload);
    
    // pastikan metadata berbentuk string JSON
    if (is_array($metadata) || is_object($metadata)) {
        $metadata = json_encode($metadata, JSON_UNESCAPED_UNICODE);
    }

    // pastikan metadata berbentuk string JSON
    if (is_array($metadata) || is_object($metadata)) {
        $metadata = json_encode($metadata, JSON_UNESCAPED_UNICODE);
    }

    if ($id > 0) {
        // update data yang sudah ada
        $stmt = $pdo->prepare("SELECT topik FROM chat_topik WHERE id = ?");
        $stmt->execute([$id]);
        $row = $stmt->fetch(PDO::FETCH_ASSOC);

        if ($row) {
            $topik = $row['topik'];

            if (count($ids) > 1) {
                // multi server → replace ke semua id_data_server
                $pdo->beginTransaction();
                try {
                    $stmt = $pdo->prepare("
                        INSERT INTO chat_topik (id_data_server, topik, deskripsi, metadata)
                        VALUES (?, ?, ?, ?)
                        ON DUPLICATE KEY UPDATE deskripsi = VALUES(deskripsi),
                                                metadata = VALUES(metadata)
                    ");
                    foreach ($ids as $sid) {
                        $stmt->execute([$sid, $topik, $deskripsi, $metadata]);
                    }
                    $pdo->commit();
                    echo json_encode(["status" => "ok"]);
                } catch (Exception $e) {
                    $pdo->rollBack();
                    echo json_encode(["status" => "error", "msg" => $e->getMessage()]);
                }
            } else {
                // single server → update biasa
                $stmt = $pdo->prepare("UPDATE chat_topik SET deskripsi = ?, metadata = ? WHERE id = ?");
                $ok = $stmt->execute([$deskripsi, $metadata, $id]);
                echo json_encode(["status" => $ok ? "ok" : "error"]);
            }
        } else {
            echo json_encode(["status" => "error", "msg" => "Topik tidak ditemukan"]);
        }
    } else {
        // jika id = 0 → insert baru
        try {
            $pdo->beginTransaction();
            $stmt = $pdo->prepare("
                INSERT INTO chat_topik (id_data_server, topik, deskripsi, metadata)
                VALUES (?, ?, ?, ?)
            ");
            foreach ($ids as $sid) {
                // topik bisa digenerate otomatis dari deskripsi (misalnya hash/md5)
                $topik = substr(md5($deskripsi . $sid), 0, 16);
                $stmt->execute([$sid, $topik, $deskripsi, $metadata]);
            }
            $pdo->commit();
            echo json_encode(["status" => "ok"]);
        } catch (Exception $e) {
            $pdo->rollBack();
            echo json_encode(["status" => "error", "msg" => $e->getMessage()]);
        }
    }
    exit;
}
    
echo json_encode(["status" => "error", "msg" => "Action tidak valid"]);