/* assets/js/main.js */

document.addEventListener('DOMContentLoaded', () => {
    const notesGrid = document.getElementById('notes-grid');
    const modal = document.getElementById('note-editor-modal');
    const editorTextarea = document.getElementById('note-editor-textarea');
    const saveNoteBtn = document.getElementById('save-note-btn');
    const noteIdInput = document.getElementById('note-editor-id');

    // --- Main Functions ---

    const fetchAndRenderNotes = async () => {
        try {
            const response = await fetch('api/notes.php');
            if (!response.ok) {
                throw new Error(`HTTP error! status: ${response.status}`);
            }
            const notes = await response.json();
            renderNotes(notes);
        } catch (error) {
            console.error("Error fetching notes:", error);
            notesGrid.innerHTML = '<p style="color: var(--text-muted);">Could not load notes. Please try again later.</p>';
        }
    };

    const renderNotes = (notes) => {
        notesGrid.innerHTML = ''; // Clear existing notes

        // 1. Add "New Note" Card
        const addCard = createAddNoteCard();
        notesGrid.appendChild(addCard);

        // 2. Add Note Cards
        if (Array.isArray(notes)) {
            notes.forEach(note => {
                const noteCard = createNoteCard(note);
                notesGrid.appendChild(noteCard);
            });
        }
    };

    // --- UI Element Creation ---

    const createAddNoteCard = () => {
        const card = document.createElement('div');
        card.className = 'note-card add-note-card';
        card.innerHTML = "
            <div class=\"add-note-icon\"><i class=\"fas fa-plus\"></i></div>
            <div class=\"add-note-text\">Add New Note</div>
        ";
        card.addEventListener('click', () => openEditor());
        return card;
    };

    const createNoteCard = (note) => {
        const card = document.createElement('div');
        card.className = 'note-card';
        card.dataset.id = note.id;

        // Auto-link URLs
        const linkedContent = (note.content || '').replace(/(https?:\[^\]+)/g, '<a href="$1" target="_blank" rel="noopener noreferrer">$1</a>');

        card.innerHTML = "
            <div class=\"note-card-content">${linkedContent}</div>
            <div class=\"note-card-footer\">
                <span class=\"note-card-date\">${new Date(note.updated_at).toLocaleDateString()}</span>
                <button class=\"delete-note-btn\"><i class=\"fas fa-trash-alt\"></i></button>
            </div>
        ";

        // Edit by clicking the card body
        card.querySelector('.note-card-content').addEventListener('click', () => openEditor(note));

        // Delete button
        card.querySelector('.delete-note-btn').addEventListener('click', (e) => {
            e.stopPropagation(); // Prevent opening editor
            showDeleteConfirmation(note.id);
        });

        return card;
    };

    // --- Editor Modal Logic ---

    const openEditor = (note = {}) => {
        noteIdInput.value = note.id || '';
        editorTextarea.value = note.content || '';
        modal.classList.add('show');
        editorTextarea.focus();
    };

    const closeEditor = () => {
        modal.classList.remove('show');
        noteIdInput.value = '';
        editorTextarea.value = '';
    };

    const saveNote = async () => {
        const id = noteIdInput.value;
        const content = editorTextarea.value;

        const url = 'api/notes.php';
        const formData = new FormData();
        formData.append('content', content);
        if (id) {
            formData.append('id', id);
        }

        try {
            const response = await fetch(url, {
                method: 'POST', // Using POST for both create and update
                body: formData
            });

            if (!response.ok) {
                throw new Error('Failed to save note');
            }

            closeEditor();
            await fetchAndRenderNotes(); // Refresh notes list
        } catch (error) {
            console.error("Error saving note:", error);
            alert('Could not save note. Please try again.');
        }
    };

    const showDeleteConfirmation = (id) => {
        if (confirm('Are you sure you want to delete this note?')) {
            deleteNote(id);
        }
    };

    const deleteNote = async (id) => {
        try {
            const formData = new FormData();
            formData.append('id', id);

            const response = await fetch('api/notes.php', {
                method: 'DELETE',
                body: formData
            });

            if (!response.ok) {
                throw new Error('Failed to delete note');
            }

            await fetchAndRenderNotes(); // Refresh notes list
        } catch (error) {
            console.error("Error deleting note:", error);
            alert('Could not delete note. Please try again.');
        }
    };

    // --- Event Listeners ---

    saveNoteBtn.addEventListener('click', saveNote);

    // Close modal if clicking on the background
    modal.addEventListener('click', (e) => {
        if (e.target === modal) {
            closeEditor();
        }
    });

    // Close with Escape key
    document.addEventListener('keydown', (e) => {
        if (e.key === 'Escape' && modal.classList.contains('show')) {
            closeEditor();
        }
    });

    // --- Initial Load ---
    if (notesGrid) { // Only run on pages with the notes grid
        fetchAndRenderNotes();
    }
});