<?php

namespace Blog\Model;

use PDOException;

class TicketModel extends Database {

    public function getTickets() {
        $pdo = $this->linkDB();
        $sql = "SELECT t.*, e.name as event_name, e.start_date, e.end_date, e.ticket_price, 
                       l.city as location_city, l.street as location_street, l.house_number as location_house_number
                FROM ticket t 
                JOIN event e ON t.event_id = e.event_id 
                JOIN location l ON e.location_id = l.location_id 
                ORDER BY t.purchase_date DESC;";
        try {
            $sth = $pdo->prepare($sql);
            $sth->execute();
            return $sth->fetchAll(\PDO::FETCH_ASSOC);
        } catch (PDOException $e) {
            new \Blog\Library\ErrorMsg("Fehler beim Lesen der Tickets.", $e);
            die;
        }
    }

    public function getUserTickets($user_id) {
        $pdo = $this->linkDB();
        $sql = "SELECT t.*, e.name as event_name, e.start_date, e.end_date, e.ticket_price, 
                       l.city as location_city, l.street as location_street, l.house_number as location_house_number
                FROM ticket t 
                JOIN event e ON t.event_id = e.event_id 
                JOIN location l ON e.location_id = l.location_id 
                WHERE t.user_id = :user_id 
                ORDER BY t.purchase_date DESC;";
        $params = [":user_id" => $user_id];
        try {
            $sth = $pdo->prepare($sql);
            $sth->execute($params);
            return $sth->fetchAll(\PDO::FETCH_ASSOC);
        } catch (PDOException $e) {
            new \Blog\Library\ErrorMsg("Fehler beim Lesen der Benutzer-Tickets.", $e);
            die;
        }
    }

    public function buyTicket($data) {
        $pdo = $this->linkDB();
        
        // First check if the event still has available tickets
        $checkSql = "SELECT e.max_tickets, COUNT(t.ticket_id) as sold_tickets 
                     FROM event e 
                     LEFT JOIN ticket t ON e.event_id = t.event_id 
                     WHERE e.event_id = :event_id 
                     GROUP BY e.event_id, e.max_tickets";
        
        try {
            $checkStmt = $pdo->prepare($checkSql);
            $checkStmt->execute([':event_id' => $data['event_id']]);
            $eventInfo = $checkStmt->fetch(\PDO::FETCH_ASSOC);
            
            if (!$eventInfo) {
                throw new \Exception("Event nicht gefunden.");
            }
            
            if ($eventInfo['sold_tickets'] >= $eventInfo['max_tickets']) {
                throw new \Exception("Alle Tickets für dieses Event sind bereits verkauft.");
            }
        } catch (PDOException $e) {
            throw new \Exception("Fehler bei der Ticketverfügbarkeitsprüfung.");
        }
        
        $sql = "INSERT INTO ticket (user_id, event_id, purchase_date, valid_until)
                VALUES (:user_id, :event_id, :purchase_date, :valid_until);";
        $params = [
            ":user_id" => $data['user_id'],
            ":event_id" => $data['event_id'],
            ":purchase_date" => $data['purchase_date'],
            ":valid_until" => $data['valid_until']
        ];
        try {
            $sth = $pdo->prepare($sql);
            $sth->execute($params);
            return $pdo->lastInsertId();
        } catch (PDOException $e) {
            throw new \Exception("Fehler beim Kauf des Tickets.");
        }
    }

    public function hasTicket($user_id, $event_id) {
        $pdo = $this->linkDB();
        $sql = "SELECT COUNT(*) as count FROM ticket WHERE user_id = :user_id AND event_id = :event_id;";
        $params = [
            ":user_id" => $user_id,
            ":event_id" => $event_id
        ];
        try {
            $sth = $pdo->prepare($sql);
            $sth->execute($params);
            return $sth->fetch(\PDO::FETCH_ASSOC);
        } catch (PDOException $e) {
            new \Blog\Library\ErrorMsg("Fehler bei der Ticketprüfung.", $e);
            die;
        }
    }

    public function deleteTicket($ticket_id) {
        $pdo = $this->linkDB();
        $sql = "DELETE FROM ticket WHERE ticket_id = :ticket_id;";
        $params = [":ticket_id" => $ticket_id];
        try {
            $sth = $pdo->prepare($sql);
            $sth->execute($params);
            return $sth->rowCount();
        } catch (PDOException $e) {
            new \Blog\Library\ErrorMsg("Fehler beim Löschen des Tickets.", $e);
            die;
        }
    }
}