<?php

/**
 * attach_worksheet_file.php
 * -------------------------------------------------------------------------
 * Riceve worksheet_id + file .xlsx (campo "xlsx_file"), salva il file in
 * uploads/worksheets/ e lo collega al foglio (colonne source_xlsx_*).
 * Chiamato dal flusso di import DOPO il salvataggio della testata.
 * -------------------------------------------------------------------------
 */

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

while (ob_get_level()) {
    ob_end_clean();
}
header('Content-Type: application/json; charset=utf-8');

include('include/headscript.php');

function jexit($a)
{
    echo json_encode($a, JSON_UNESCAPED_UNICODE);
    exit;
}

try {
    if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
        jexit(['success' => false, 'message' => 'Metodo non valido']);
    }

    $worksheet_id = isset($_POST['worksheet_id']) && is_numeric($_POST['worksheet_id'])
        ? (int)$_POST['worksheet_id'] : 0;
    if ($worksheet_id <= 0) {
        jexit(['success' => false, 'message' => 'worksheet_id mancante o non valido']);
    }

    if (!isset($_FILES['xlsx_file']) || $_FILES['xlsx_file']['error'] !== UPLOAD_ERR_OK) {
        jexit(['success' => false, 'message' => 'File non ricevuto']);
    }
    $file = $_FILES['xlsx_file'];

    if ($file['size'] > 5 * 1024 * 1024) {
        jexit(['success' => false, 'message' => 'File troppo grande (max 5 MB)']);
    }
    $ext = strtolower(pathinfo($file['name'], PATHINFO_EXTENSION));
    if ($ext !== 'xlsx') {
        jexit(['success' => false, 'message' => 'Sono ammessi solo file .xlsx']);
    }

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

    // il foglio deve esistere
    $chk = $pdo->prepare("SELECT id FROM work_sheets WHERE id = ?");
    $chk->execute([$worksheet_id]);
    if (!$chk->fetchColumn()) {
        jexit(['success' => false, 'message' => 'Foglio di lavoro inesistente']);
    }

    // cartella di destinazione (accanto allo script)
    $dir = __DIR__ . '/uploads/worksheets';
    if (!is_dir($dir) && !mkdir($dir, 0775, true) && !is_dir($dir)) {
        jexit(['success' => false, 'message' => 'Impossibile creare la cartella uploads/worksheets']);
    }

    $origName   = $file['name'];
    $safeStored = 'ws_' . $worksheet_id . '_' . date('Ymd_His') . '.xlsx';
    $destAbs    = $dir . '/' . $safeStored;
    $destRel    = 'uploads/worksheets/' . $safeStored; // relativo alla cartella dello script

    if (!move_uploaded_file($file['tmp_name'], $destAbs)) {
        jexit(['success' => false, 'message' => 'Salvataggio del file fallito']);
    }

    $upd = $pdo->prepare("UPDATE work_sheets SET source_xlsx_name = ?, source_xlsx_path = ? WHERE id = ?");
    $upd->execute([$origName, $destRel, $worksheet_id]);

    jexit(['success' => true, 'name' => $origName, 'path' => $destRel]);
} catch (Exception $e) {
    jexit(['success' => false, 'message' => $e->getMessage()]);
}