<?php
require_once('Connections/bkngstm.php');
require_once('webassist/mysqli/rsobj.php');
include('include/headscript.php'); // $iduserlogin

/***********************
 * LOG (mail + debug)
 ***********************/
$logDir = __DIR__ . '/logs';
if (!is_dir($logDir)) {
    @mkdir($logDir, 0755, true);
}
$mailLogFile = $logDir . '/mail_cancel.log';

function mail_log($file, $msg)
{
    @file_put_contents($file, "[" . date("Y-m-d H:i:s") . "] " . $msg . PHP_EOL, FILE_APPEND);
}

/***********************
 * INPUT
 ***********************/
if (!isset($_GET['id'])) {
    die("ID non fornito.");
}

$id     = (int)$_GET['id'];
$userId = (int)$iduserlogin;

/***********************
 * DB
 ***********************/
$conn = $bkngstm;

/***********************
 * 1) USER INFO (auth_users)
 ***********************/
$stmt = $conn->prepare("SELECT email, first_name, last_name FROM auth_users WHERE id = ? LIMIT 1");
$stmt->bind_param("i", $userId);
$stmt->execute();
$res = $stmt->get_result();
$u = $res->fetch_assoc();
$stmt->close();

$userEmail = $u['email'] ?? '';
$userName  = trim(($u['first_name'] ?? '') . ' ' . ($u['last_name'] ?? ''));

/***********************
 * 2) BOOKING INFO (nome classe + data) + ownership check
 ***********************/
$stmt = $conn->prepare("
    SELECT
        bc.idbookingclass,
        bc.idorder,
        bc.status,
        bc.bookingstart,
        s.servicename,
        ss.dateschedule
    FROM bookingclass bc
    LEFT JOIN service s ON bc.idservice = s.idservice
    LEFT JOIN serviceschedule ss ON bc.idserviceschedule = ss.idserviceschedule
    WHERE bc.idbookingclass = ? AND bc.iduser = ?
    LIMIT 1
");
$stmt->bind_param("ii", $id, $userId);
$stmt->execute();
$res = $stmt->get_result();
$bk = $res->fetch_assoc();
$stmt->close();

if (!$bk) {
    header("Location: userpanel.php?deleted=0&err=notfound");
    exit();
}

$className    = $bk['servicename'] ?? 'Lezione';
$classDateRaw = $bk['dateschedule'] ?? null;

$classDateTxt  = $classDateRaw ? date("d-m-Y H:i", strtotime($classDateRaw)) : 'N/D';
$cancelDateTxt = date("d-m-Y H:i");

/***********************
 * 3) CONTROLLI (stesse regole di userpanel.php)
 ***********************/
// Solo prenotazioni confermate: pending e lista d'attesa hanno i loro percorsi
if (($bk['status'] ?? '') !== 'booked') {
    header("Location: userpanel.php?deleted=0&err=status");
    exit();
}

// Finestra oraria
$classTime   = new DateTime($classDateRaw ?: $bk['bookingstart']);
$currentTime = new DateTime();

// Lezione già iniziata o passata: non si cancella
if ($classTime <= $currentTime) {
    header("Location: userpanel.php?deleted=0&err=window");
    exit();
}

// Lezione di oggi: fino alle 17:00 entro le 00:01, dopo le 17:00 entro le 12:00
if ($classTime->format('Y-m-d') === $currentTime->format('Y-m-d')) {
    $classHour    = (int) $classTime->format('H');
    $classMinute  = (int) $classTime->format('i');
    $isBefore1700 = ($classHour < 17) || ($classHour === 17 && $classMinute === 0);
    $deadline     = new DateTime($classTime->format($isBefore1700 ? 'Y-m-d 00:01:00' : 'Y-m-d 12:00:00'));
    if ($currentTime > $deadline) {
        header("Location: userpanel.php?deleted=0&err=window");
        exit();
    }
}

/***********************
 * 3b) STORICO + RIPROGRAMMAZIONE + CANCELLAZIONE
 *     Tutto in una transazione: o riesce tutto o niente.
 ***********************/
$idOrder     = $bk['idorder'] !== null ? (int) $bk['idorder'] : null;
$ord         = null;
$incremented = 'N';
$ticketLost  = false;

try {
    $conn->begin_transaction();

    // Limite riprogrammazioni (stessa regola del pulsante Riprogramma).
    // FOR UPDATE: blocca la riga dell'ordine contro doppi click.
    if ($idOrder !== null) {
        $stmt = $conn->prepare("SELECT reprogrammed, maxreschedule FROM orderbook WHERE idorderbook = ? FOR UPDATE");
        $stmt->bind_param("i", $idOrder);
        $stmt->execute();
        $ord = $stmt->get_result()->fetch_assoc();
        $stmt->close();

        if ($ord) {
            if ((int) $ord['reprogrammed'] >= (int) $ord['maxreschedule']) {
                // Limite raggiunto: può cancellare (libera il posto) ma il ticket va perso
                $ticketLost = true;
            } else {
                $incremented = 'Y';
            }
        }
    }

    // Copia nello storico (prima di eliminare)
    $stmt = $conn->prepare("
        INSERT INTO bookingclass_cancellations
            (idbookingclass, idserviceschedule, bookingstart, status, idservice, iduser, idorder,
             prevbookingstart, is_reprogrammed, is_gift, booking_created_at,
             cancelled_at, cancelled_by, reprogrammed_incremented)
        SELECT idbookingclass, idserviceschedule, bookingstart, status, idservice, iduser, idorder,
               prevbookingstart, is_reprogrammed, is_gift, created_at,
               NOW(), ?, ?
        FROM bookingclass
        WHERE idbookingclass = ? AND iduser = ?
    ");
    $storicoFlag = $ticketLost ? 'L' : $incremented;
    $stmt->bind_param("isii", $userId, $storicoFlag, $id, $userId);
    $stmt->execute();
    $copied = $stmt->affected_rows;
    $stmt->close();
    if ($copied !== 1) {
        throw new RuntimeException('notfound');
    }

    // La cancellazione conta come una riprogrammazione
    if ($incremented === 'Y') {
        $stmt = $conn->prepare("UPDATE orderbook SET reprogrammed = reprogrammed + 1 WHERE idorderbook = ?");
        $stmt->bind_param("i", $idOrder);
        $stmt->execute();
        $stmt->close();
    }

    // Limite raggiunto: la prenotazione resta come persa (status 'lost'),
    // il posto in sala si libera ma il ticket non torna da programmare.
    // Altrimenti eliminazione normale: il ticket torna disponibile.
    if ($ticketLost) {
        $stmt = $conn->prepare("UPDATE bookingclass SET status = 'lost', lostlesson = 'Y' WHERE idbookingclass = ? AND iduser = ?");
    } else {
        $stmt = $conn->prepare("DELETE FROM bookingclass WHERE idbookingclass = ? AND iduser = ?");
    }
    $stmt->bind_param("ii", $id, $userId);
    $stmt->execute();
    $deleted = $stmt->affected_rows;
    $stmt->close();
    if ($deleted !== 1) {
        throw new RuntimeException('notfound');
    }

    $conn->commit();
} catch (Throwable $e) {
    try {
        $conn->rollback();
    } catch (Throwable $ignored) {
    }

    $code = in_array($e->getMessage(), ['limit', 'notfound'], true) ? $e->getMessage() : 'db';
    if ($code === 'db') {
        error_log("delete_lesson #{$id} utente #{$userId}: " . $e->getMessage());
    }
    header("Location: userpanel.php?deleted=0&err=" . $code);
    exit();
}
// Connessione $bkngstm gestita globalmente: non la chiudiamo qui

/***********************
 * 4) EMAIL (TO utente + CC info@yogasoul.it)
 * Usa le chiavi del tuo .env: MAIL_HOST, MAIL_PORT, MAIL_USERNAME, ...
 ***********************/
try {
    // Carica vendor/autoload + dotenv (il tuo file esistente)
    require_once(__DIR__ . '/class/mailer.php');

    $mail = new \PHPMailer\PHPMailer\PHPMailer(true);

    // Legge le variabili in stile Laravel (con trim per eventuali virgolette)
    $host = trim($_ENV['MAIL_HOST'] ?? 'mail.yogasoul.it', "\" \t\n\r\0\x0B");
    $port = (int)($_ENV['MAIL_PORT'] ?? 465);
    $user = $_ENV['MAIL_USERNAME'] ?? '';
    $pass = $_ENV['MAIL_PASSWORD'] ?? '';
    $enc  = strtolower(trim($_ENV['MAIL_ENCRYPTION'] ?? 'ssl', "\" \t\n\r\0\x0B"));

    $fromEmail = trim($_ENV['MAIL_FROM_ADDRESS'] ?? 'info@yogasoul.it', "\" \t\n\r\0\x0B");
    $fromName  = trim($_ENV['MAIL_FROM_NAME'] ?? 'YogiBook', "\" \t\n\r\0\x0B");

    // Config SMTP
    $mail->isSMTP();
    $mail->Host       = $host;
    $mail->SMTPAuth   = true;
    $mail->Username   = $user;
    $mail->Password   = $pass;
    $mail->Port       = $port;

    if (in_array($enc, ['tls', 'ssl'], true)) {
        $mail->SMTPSecure = $enc;
    }

    // Timeout (utile su SMTP hosting)
    $mail->Timeout = 20;

    $mail->setFrom($fromEmail, $fromName);
    $mail->CharSet = 'UTF-8';
    $mail->isHTML(true);

    // Destinatari
    if (!empty($userEmail)) {
        $mail->addAddress($userEmail, $userName ?: '');
    }
    $mail->addCC('info@yogasoul.it');

    // Log impostazioni usate (senza password)
    mail_log($mailLogFile, "SMTP in uso host={$host} porta={$port} enc={$enc} user={$user}");

    // Contenuto (ITALIANO)
    $mail->Subject = "Lezione cancellata - {$className}";
    $mail->Body = "
        <div style='font-family:Arial,sans-serif;font-size:14px;color:#222'>
            <p>Ciao " . htmlspecialchars($userName ?: 'Yogi') . ",</p>
            <p>La tua lezione è stata <b>cancellata</b>.</p>" . ($ticketLost ? "
            <p>Avendo già usato tutte le riprogrammazioni del pacchetto, questa lezione non potrà essere recuperata.</p>" : "") . "
            <p>
              <b>Lezione:</b> " . htmlspecialchars($className) . "<br>
              <b>Data/ora prevista:</b> " . htmlspecialchars($classDateTxt) . "<br>
              <b>Data/ora cancellazione:</b> " . htmlspecialchars($cancelDateTxt) . "<br>
              <b>ID prenotazione:</b> #{$id}
            </p>
            <p>Grazie,<br>— " . htmlspecialchars($fromName) . "</p>
        </div>
    ";

    $mail->send();

    mail_log($mailLogFile, "OK inviata. booking_id={$id} user_id={$userId} to={$userEmail} lezione='" . $className . "' prevista='{$classDateTxt}' cancellata='{$cancelDateTxt}'");
} catch (Throwable $e) {
    mail_log($mailLogFile, "ERRORE invio. booking_id={$id} user_id={$userId} to={$userEmail} :: " . $e->getMessage());
    error_log("Mailer error (delete booking #{$id}, user #{$userId}): " . $e->getMessage());
}

// Redirect
header("Location: userpanel.php?deleted=" . ($ticketLost ? 'lost' : '1'));
exit();