<?php
header('Content-Type: application/json');
require_once __DIR__ . '/class/db-functions.php';

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

    $production_id = isset($_GET['production_id']) ? (int)$_GET['production_id'] : 0;
    $photo_type    = $_GET['photo_type'] ?? '';
    $slot          = isset($_GET['param_position']) ? (int)$_GET['param_position'] : null;

    if ($production_id <= 0 || $photo_type === '') {
        throw new Exception("Parametri non validi");
    }

    // QUERY BASE
    $sql = "
        SELECT id, filename, photo_type, created_at, elaborato
        FROM production_photos
        WHERE production_id = :prod
          AND photo_type = :ptype
    ";

    // SE È PARAMETRO MACCHINA → FILTRO PER POSIZIONE
    if ($photo_type === 'parametri_macchina') {
        $sql .= " AND param_position = :slot";
    }

    $sql .= " ORDER BY created_at DESC, id DESC";

    $stmt = $pdo->prepare($sql);

    $params = [
        ':prod'  => $production_id,
        ':ptype' => $photo_type
    ];

    if ($photo_type === 'parametri_macchina') {
        $params[':slot'] = $slot;
    }

    $stmt->execute($params);
    $photos = $stmt->fetchAll(PDO::FETCH_ASSOC);

    echo json_encode([
        'success' => true,
        'photos'  => $photos
    ]);
} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'message' => $e->getMessage()
    ]);
}