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

ini_set('display_errors', '0');
error_reporting(E_ALL);

try {
    require_once __DIR__ . '/class/db-functions.php';

    if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
        echo json_encode([
            'success' => false,
            'message' => 'Metodo non consentito'
        ]);
        exit;
    }

    $id = isset($_POST['id']) ? (int)$_POST['id'] : 0;
    $idmescola = isset($_POST['idmescola']) ? (int)$_POST['idmescola'] : 0;
    $idsupplier = isset($_POST['idsupplier']) ? (int)$_POST['idsupplier'] : 0;
    $supplier_mix_name = trim($_POST['supplier_mix_name'] ?? '');
    $lot_code = trim($_POST['lot_code'] ?? '');
    $expiry_date = trim($_POST['expiry_date'] ?? '');
    $qty = isset($_POST['qty']) ? str_replace(',', '.', trim((string)$_POST['qty'])) : '0';

    if ($id <= 0) {
        echo json_encode([
            'success' => false,
            'message' => 'ID record non valido'
        ]);
        exit;
    }

    if ($idmescola <= 0) {
        echo json_encode([
            'success' => false,
            'message' => 'ID mescola non valido'
        ]);
        exit;
    }

    if ($idsupplier <= 0) {
        echo json_encode([
            'success' => false,
            'message' => 'Fornitore obbligatorio'
        ]);
        exit;
    }

    if ($supplier_mix_name === '') {
        echo json_encode([
            'success' => false,
            'message' => 'Il nome mescola fornitore è obbligatorio'
        ]);
        exit;
    }

    if ($qty === '' || !is_numeric($qty)) {
        echo json_encode([
            'success' => false,
            'message' => 'Quantità non valida'
        ]);
        exit;
    }

    $qty = (float)$qty;

    if ($expiry_date === '') {
        $expiry_date = null;
    } else {
        $dt = DateTime::createFromFormat('Y-m-d', $expiry_date);
        if (!$dt || $dt->format('Y-m-d') !== $expiry_date) {
            echo json_encode([
                'success' => false,
                'message' => 'Data scadenza non valida'
            ]);
            exit;
        }
    }

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

    // Verifica che il record esista
    $check = $pdo->prepare("
        SELECT id
        FROM mescole_supplier_lots
        WHERE id = ?
        LIMIT 1
    ");
    $check->execute([$id]);

    if (!$check->fetch(PDO::FETCH_ASSOC)) {
        echo json_encode([
            'success' => false,
            'message' => 'Record non trovato'
        ]);
        exit;
    }

    $sql = "
        UPDATE mescole_supplier_lots
        SET
            idmescola = :idmescola,
            idsupplier = :idsupplier,
            supplier_mix_name = :supplier_mix_name,
            lot_code = :lot_code,
            expiry_date = :expiry_date,
            qty = :qty
        WHERE id = :id
        LIMIT 1
    ";

    $stmt = $pdo->prepare($sql);
    $ok = $stmt->execute([
        ':idmescola' => $idmescola,
        ':idsupplier' => $idsupplier,
        ':supplier_mix_name' => $supplier_mix_name,
        ':lot_code' => $lot_code !== '' ? $lot_code : null,
        ':expiry_date' => $expiry_date,
        ':qty' => $qty,
        ':id' => $id
    ]);

    if ($ok) {
        echo json_encode([
            'success' => true,
            'message' => 'Record aggiornato correttamente'
        ]);
        exit;
    }

    echo json_encode([
        'success' => false,
        'message' => 'Aggiornamento non riuscito'
    ]);
    exit;
} catch (Throwable $e) {
    echo json_encode([
        'success' => false,
        'message' => 'Errore server: ' . $e->getMessage()
    ]);
    exit;
}