<?php
require_once 'include/headscript.php';

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

// Funzioni di colore per terminale (se lo lanci da CLI)
function green($text)
{
    return "\033[32m$text\033[0m";
}
function yellow($text)
{
    return "\033[33m$text\033[0m";
}
function red($text)
{
    return "\033[31m$text\033[0m";
}
function cyan($text)
{
    return "\033[36m$text\033[0m";
}
function magenta($text)
{
    return "\033[35m$text\033[0m";
}

echo cyan("=== AVVIO PROPAGAZIONE AUTOMATICA - " . date('Y-m-d H:i:s') . " ===\n");

try {
    $pdo->beginTransaction();

    $totalBookings = 0;
    $totalOrders   = 0;

    $orderSql = "
        SELECT o.id, o.order_number, o.user_id, o.school_id, o.available_entries,
               o.product_id, o.variation_id, o.activation_date,
               p.name as product_name,
               pv.name as variation_name,
               u.email as user_email
        FROM orders o
        INNER JOIN products p ON o.product_id = p.id
        LEFT JOIN product_variations pv ON o.variation_id = pv.id AND pv.id IS NOT NULL
        LEFT JOIN auth_users u ON o.user_id = u.id
        WHERE o.status = 'completed'
          AND o.available_entries > 0
          AND (p.auto_propagate_to_order = 1 OR pv.auto_propagate_to_order = 1)
          AND (o.activation_date IS NULL OR o.activation_date <= CURDATE())
        ORDER BY o.created_at ASC
    ";

    $orderStmt = $pdo->prepare($orderSql);
    $orderStmt->execute();
    $orders = $orderStmt->fetchAll(PDO::FETCH_ASSOC);

    echo yellow("Trovati " . count($orders) . " ordini da propagare automaticamente.\n\n");

    foreach ($orders as $order) {
        $totalOrders++;
        $orderId        = $order['id'];
        $orderNumber    = $order['order_number'];
        $userId         = $order['user_id'];
        $userEmail      = $order['user_email'];
        $schoolId       = $order['school_id'];
        $remaining      = (int)$order['available_entries'];
        $productName    = $order['variation_name'] ?? $order['product_name'];
        $activation     = $order['activation_date'] ?: 'immediata';

        echo magenta("──────────────────────────────────────────────────────\n");
        echo green("ELABORAZIONE ORDINE #$orderNumber (ID: $orderId)\n");
        echo green("Utente: $userEmail (ID: $userId) | Scuola ID: $schoolId\n");
        echo green("Prodotto: $productName | Ingressi da propagare: $remaining | Attivazione: $activation\n");

        // Recupera class_type consentiti
        $ctSql = "SELECT DISTINCT class_type_id FROM product_class_types WHERE product_id = ? AND (variation_id IS NULL OR variation_id = ? OR variation_id = ?)";
        $ctStmt = $pdo->prepare($ctSql);
        $ctStmt->execute([$order['product_id'], $order['variation_id'], $order['variation_id']]);
        $classTypeIds = $ctStmt->fetchAll(PDO::FETCH_COLUMN);

        if (empty($classTypeIds)) {
            echo red("Nessun class_type associato al prodotto → SKIP\n");
            continue;
        }

        // Nomi delle classi per debug - VERSIONE MIGLIORE
        $placeholders = str_repeat('?,', count($classTypeIds) - 1) . '?';
        $namesSql = "
            SELECT ct.id, CONCAT(c.name, ' - ', ct.level, ' ', 
                   CASE ct.day_of_week
                     WHEN 'monday' THEN 'Lun'
                     WHEN 'tuesday' THEN 'Mar'
                     WHEN 'wednesday' THEN 'Mer'
                     WHEN 'thursday' THEN 'Gio'
                     WHEN 'friday' THEN 'Ven'
                     WHEN 'saturday' THEN 'Sab'
                     WHEN 'sunday' THEN 'Dom'
                   END, ' ', TIME_FORMAT(ct.start_time, '%H:%i')
                 ) as name 
            FROM class_types ct 
            JOIN classes c ON ct.class_id = c.id 
            WHERE ct.id IN ($placeholders)
            ORDER BY name
        ";
        $namesStmt = $pdo->prepare($namesSql);
        $namesStmt->execute($classTypeIds);
        $classNames = $namesStmt->fetchAll(PDO::FETCH_KEY_PAIR);

        echo cyan("Classi consentite (" . count($classTypeIds) . "): " . implode(', ', array_values($classNames)) . "\n");

        // Giorni di chiusura
        $offStmt = $pdo->prepare("SELECT start_date, end_date FROM day_off WHERE school_id = ? AND end_date >= CURDATE()");
        $offStmt->execute([$schoolId]);
        $offDates = [];
        foreach ($offStmt->fetchAll() as $off) {
            $start = new DateTime($off['start_date']);
            $end   = new DateTime($off['end_date']);
            $end->modify('+1 day');
            $period = new DatePeriod($start, new DateInterval('P1D'), $end);
            foreach ($period as $d) $offDates[$d->format('Y-m-d')] = true;
        }

        // Tutte le sessioni future
        $sessionSql = "
            SELECT cs.id, cs.session_date, cs.start_time, cs.max_capacity, cs.class_type_id,
                   (SELECT COUNT(*) FROM session_bookings sb 
                    WHERE sb.session_id = cs.id 
                      AND sb.status IN ('booked','attended','rescheduled')) as booked
            FROM class_sessions cs
            WHERE cs.class_type_id IN ($placeholders)
              AND cs.school_id = ?
              AND cs.session_date >= ?
              AND cs.status = 'scheduled'
            ORDER BY cs.session_date ASC, cs.start_time ASC
            LIMIT 2000
        ";

        $fromDate = $order['activation_date'] ?: date('Y-m-d');
        $params = array_merge($classTypeIds, [$schoolId, $fromDate]);
        $sessionStmt = $pdo->prepare($sessionSql);
        $sessionStmt->execute($params);
        $sessions = $sessionStmt->fetchAll(PDO::FETCH_ASSOC);

        echo yellow("Trovate " . count($sessions) . " lezioni future per queste classi.\n");

        $bookedThisOrder = 0;

        foreach ($sessions as $s) {
            if ($remaining <= 0) break;

            $date = $s['session_date'];
            $time = substr($s['start_time'], 0, 5);
            $className = $classNames[$s['class_type_id']] ?? 'Sconosciuta';

            if (isset($offDates[$date])) {
                echo "  ⚠️  $date $time → $className → GIORNO DI CHIUSURA → saltata\n";
                continue;
            }

            $free = $s['max_capacity'] ? ($s['max_capacity'] - $s['booked']) : 999;

            if ($free <= 0) {
                echo red("  FULL $date $time → $className (Posti: {$s['booked']}/{$s['max_capacity']}) → saltata\n");
                continue;
            }

            // PRENOTA!
            $insert = $pdo->prepare("INSERT INTO session_bookings 
                (session_id, user_id, order_id, status, booked_at, created_at, updated_at) 
                VALUES (?, ?, ?, 'booked', NOW(), NOW(), NOW())");
            $insert->execute([$s['id'], $userId, $orderId]);

            $totalBookings++;
            $bookedThisOrder++;
            $remaining--;

            echo green("  PRENOTATA $date $time → $className | Posto libero: $free → rimanenti da propagare: $remaining\n");
        }

        // Aggiornamento ordine
        if ($bookedThisOrder > 0) {
            $newStatus = ($remaining <= 0) ? 'propagated' : 'completed';
            $pdo->prepare("UPDATE orders SET available_entries = ?, status = ? WHERE id = ?")
                ->execute([$remaining, $newStatus, $orderId]);

            echo green("Ordine aggiornato: available_entries = $remaining | status = $newStatus\n");
        } else {
            echo yellow("Nessuna lezione disponibile al momento → ci riproverà alla prossima esecuzione\n");
        }
        echo magenta("──────────────────────────────────────────────────────\n\n");
    }

    $pdo->commit();

    echo cyan("=== PROPAGAZIONE COMPLETATA ===\n");
    echo green("Ordini processati: $totalOrders\n");
    echo green("Prenotazioni automatiche create: $totalBookings\n");
    echo cyan("Fine esecuzione: " . date('Y-m-d H:i:s') . "\n");
} catch (Exception $e) {
    $pdo->rollBack();
    echo red("ERRORE CRITICO: " . $e->getMessage() . "\n");
    error_log("Auto-propagate error: " . $e->getMessage());
}