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

try {

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

    if (empty($_POST['production_id']) || empty($_POST['photo_type'])) {
        throw new Exception("Dati mancanti");
    }

    $production_id  = (int)$_POST['production_id'];
    $type           = $_POST['photo_type'];
    $param_position = isset($_POST['param_position']) && $_POST['param_position'] !== ''
        ? (int)$_POST['param_position']
        : null;

    if (!isset($_FILES['photo']) || $_FILES['photo']['error'] !== UPLOAD_ERR_OK) {
        throw new Exception("Nessuna foto valida caricata");
    }

    // Estensione
    $ext = strtolower(pathinfo($_FILES['photo']['name'], PATHINFO_EXTENSION));
    if ($ext === '') {
        $ext = "jpg";
    }

    // Directory foto
    $photosDir = __DIR__ . "/photos/";
    if (!is_dir($photosDir)) {
        mkdir($photosDir, 0777, true);
    }

    /**
     * Se è una foto di parametri macchina con posizione:
     * - deve esistere UNA sola foto per (production_id, type, param_position)
     * - quindi prima eliminiamo eventuali foto precedenti (file + record DB)
     */
    if ($type === 'parametri_macchina' && $param_position !== null) {

        // Leggo eventuali foto già presenti per questa combinazione
        $stmtOld = $pdo->prepare("
            SELECT id, filename
            FROM production_photos
            WHERE production_id = :pid
              AND photo_type = :ptype
              AND param_position = :pos
        ");
        $stmtOld->execute([
            ':pid'   => $production_id,
            ':ptype' => $type,
            ':pos'   => $param_position
        ]);

        $oldPhotos = $stmtOld->fetchAll(PDO::FETCH_ASSOC);

        // Cancello i file fisici se esistono
        foreach ($oldPhotos as $old) {
            if (!empty($old['filename'])) {
                $oldPath = $photosDir . $old['filename'];
                if (is_file($oldPath)) {
                    @unlink($oldPath);
                }
            }
        }

        // Cancello i record dal DB
        if (!empty($oldPhotos)) {
            $stmtDel = $pdo->prepare("
                DELETE FROM production_photos
                WHERE production_id = :pid
                  AND photo_type = :ptype
                  AND param_position = :pos
            ");
            $stmtDel->execute([
                ':pid'   => $production_id,
                ':ptype' => $type,
                ':pos'   => $param_position
            ]);
        }
    }

    // Primo insert (filename vuoto)
    $stmt = $pdo->prepare("
        INSERT INTO production_photos (production_id, photo_type, filename, param_position)
        VALUES (:pid, :ptype, '', :pos)
    ");

    $stmt->execute([
        ':pid'   => $production_id,
        ':ptype' => $type,
        ':pos'   => $param_position
    ]);

    $photo_id  = $pdo->lastInsertId();
    $timestamp = time();

    // Nome file finale
    $filename = "{$production_id}-{$photo_id}-{$timestamp}.{$ext}";
    $filepath = $photosDir . $filename;

    // Salvataggio file
    if (!move_uploaded_file($_FILES['photo']['tmp_name'], $filepath)) {
        throw new Exception("Errore salvataggio file");
    }

    // Aggiorna filename nel DB
    $stmt = $pdo->prepare("
        UPDATE production_photos
        SET filename = :fn
        WHERE id = :id
    ");

    $stmt->execute([
        ':fn' => $filename,
        ':id' => $photo_id
    ]);

    echo json_encode(["success" => true]);
} catch (Exception $e) {

    echo json_encode([
        "success" => false,
        "message" => $e->getMessage()
    ]);
}