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<!DOCTYPE html>
<html lang="de">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>{{ page_title }}</title>
    <style>
        body { font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto; padding: 20px; }
        select, input, button { margin: 10px 0; padding: 5px; }
        #message { margin-top: 20px; font-weight: bold; }
    </style>
</head>
<body>
    <h1>{{ page_title }}</h1>
    
    <h2>Buch zurückgeben</h2>
    <input type="number" id="returnBookId" placeholder="Buchnummer eingeben">
    <button onclick="returnBook()">Buch zurückgeben</button>

    <h2>Buch ausleihen</h2>
    <select id="groupSelect" onchange="loadStudents()">
        <option value="">Gruppe auswählen</option>
    </select>
    <select id="studentSelect" onchange="loadOutstandingBooks()">
        <option value="">Schüler auswählen</option>
    </select>
    <input type="number" id="borrowBookId" placeholder="Buchnummer eingeben">
    <button onclick="borrowBook()">Buch ausleihen</button>

    <div id="message"></div>
    <div id="outstandingBooks"></div>

    <script>
        // Load groups when the page loads
        window.onload = function() {
            loadGroups();
            
            document.getElementById('returnBookId').addEventListener('keyup', function(event) {
                if (event.key === 'Enter') {
                    returnBook();
                }
            });

            document.getElementById('borrowBookId').addEventListener('keyup', function(event) {
                if (event.key === 'Enter') {
                    borrowBook();
                }
            });
        };

        function loadGroups() {
            fetch('/groups')
                .then(response => response.json())
                .then(groups => {
                    const select = document.getElementById('groupSelect');
                    // Add "Alle Gruppen" option
                    const allGroupsOption = document.createElement('option');
                    allGroupsOption.value = "all";
                    allGroupsOption.textContent = "Alle Gruppen";
                    select.appendChild(allGroupsOption);
                    // Add other groups
                    groups.forEach(group => {
                        const option = document.createElement('option');
                        option.value = group.idGruppe;
                        option.textContent = group.Gruppe;
                        select.appendChild(option);
                    });
                });
        }

        function loadStudents() {
            const groupId = document.getElementById('groupSelect').value;
            if (!groupId) return;

            let url = groupId === 'all' ? '/students/all' : `/students/${groupId}`;

            fetch(url)
                .then(response => response.json())
                .then(students => {
                    const select = document.getElementById('studentSelect');
                    select.innerHTML = '<option value="">Schüler auswählen</option>';
                    students.forEach(student => {
                        const option = document.createElement('option');
                        option.value = student.idKind;
                        option.textContent = student.Kind;
                        select.appendChild(option);
                    });
                    // Clear outstanding books when changing students
                    document.getElementById('outstandingBooks').innerHTML = '';
                });
        }

        function loadOutstandingBooks() {
            const studentId = document.getElementById('studentSelect').value;
            if (!studentId) {
                document.getElementById('outstandingBooks').innerHTML = '';
                return;
            }

            fetch(`/borrowed/${studentId}`)
                .then(response => response.json())
                .then(books => {
                    const outstandingBooksDiv = document.getElementById('outstandingBooks');
                    if (books.length === 0) {
                        outstandingBooksDiv.innerHTML = '<p>Keine ausstehenden Bücher</p>';
                    } else {
                        let html = '<h3>Ausstehende Bücher:</h3><ul>';
                        books.forEach(book => {
                            const borrowDate = new Date(book.ausleihe).toLocaleDateString('de-DE');
                            html += `<li>Buch ID: ${book.idBuch}, Ausgeliehen am: ${borrowDate}</li>`;
                        });
                        html += '</ul>';
                        outstandingBooksDiv.innerHTML = html;
                    }
                });
        }

        function returnBook() {
            const bookId = document.getElementById('returnBookId').value;
            if (!bookId) {
                setMessage('Bitte geben Sie eine Buchnummer ein');
                return;
            }

            fetch(`/return/${bookId}`)
                .then(response => response.json())
                .then(result => {
                    if (result.success) {
                        let message = `Buch (Nummer: ${bookId}) erfolgreich zurückgegeben.`;
                        if (result.student_names.length === 1) {
                            message += ` Ausgeliehen von: ${result.student_names[0]}`;
                        } else if (result.student_names.length > 1) {
                            message += ` Ausgeliehen von: ${result.student_names.join(', ')}`;
                        }
                        setMessage(message);
                        document.getElementById('returnBookId').value = ''; // Clear input field
                    } else {
                        setMessage(`Buch (Nummer: ${bookId}) nicht zurückgegeben. ` + result.message);
                    }
                });
        }

        function borrowBook() {
            const studentId = document.getElementById('studentSelect').value;
            const bookId = document.getElementById('borrowBookId').value;

            if (!studentId || !bookId) {
                setMessage('Bitte wählen Sie einen Schüler aus und geben Sie eine Buchnummer ein');
                return;
            }

            fetch(`/borrow/${bookId}/${studentId}`)
                .then(response => response.json())
                .then(result => {
                    if (result.success) {
                        setMessage(`Buch (Nummer: ${bookId}) erfolgreich ausgeliehen`);
                        document.getElementById('borrowBookId').value = ''; // Clear input field
                    } else {
                        setMessage('Fehler beim Ausleihen des Buches: ' + result.message);
                    }
                    // Refresh the outstanding books list
                    loadOutstandingBooks();
                });
        }

        function setMessage(msg) {
            document.getElementById('message').textContent = msg;
        }
    </script>
</body>
</html>