<?php
include('include/headscript.php');
header('Content-Type: application/json; charset=utf-8');

try {
    $idmatrice = (int)($_GET['id'] ?? 0);
    if ($idmatrice <= 0) {
        echo json_encode(['success' => false, 'message' => 'Invalid id']);
        exit;
    }

    $db = DBHandlerSelect::getInstance();
    $pdo = $db->getConnection();

    // tutte le mescole
    $stmt = $pdo->query("
        SELECT id, nome, nomeuscita
        FROM mescole
        ORDER BY nome ASC
    ");
    $mescole = $stmt->fetchAll(PDO::FETCH_ASSOC);

    // mescole già associate
    $stmt = $pdo->prepare("SELECT idmescola FROM matrici_mescole WHERE idmatrice = ?");
    $stmt->execute([$idmatrice]);
    $selected_ids = $stmt->fetchAll(PDO::FETCH_COLUMN);

    echo json_encode([
        'success' => true,
        'mescole' => $mescole,
        'selected_ids' => $selected_ids
    ]);
} catch (Throwable $e) {
    echo json_encode(['success' => false, 'message' => 'Server error']);
}