// ============================================================
// Media Browser: Navigation, rendering, search, pagination
// ============================================================

// Browser state
let currentFolderId = null;
let currentPath = '';
let currentOffset = 0;
let itemsPerPage = parseInt(localStorage.getItem('mediaBrowser.itemsPerPage')) || 100;
let totalItems = 0;
let mediaFolders = {};
let viewMode = localStorage.getItem('mediaBrowser.viewMode') || 'grid';
let cachedItems = null;
let browserSearchTerm = '';
let browserSearchTimer = null;
const thumbnailCache = new Map();
const THUMBNAIL_CACHE_MAX = 200;

// Load media folders on page load
async function loadMediaFolders() {
    try {
        const token = localStorage.getItem('media_server_token');
        if (!token) {
            console.error('No API token found');
            return;
        }

        const response = await fetch('/api/browser/folders', {
            headers: { 'Authorization': `Bearer ${token}` }
        });

        if (!response.ok) throw new Error('Failed to load folders');

        mediaFolders = await response.json();

        // Load last browsed path or show root folder list
        loadLastBrowserPath();
    } catch (error) {
        console.error('Error loading media folders:', error);
        showToast(t('browser.error_loading_folders'), 'error');
    }
}

function showRootFolders() {
    currentFolderId = '';
    currentPath = '';
    currentOffset = 0;
    cachedItems = null;

    // Hide search at root level
    showBrowserSearch(false);

    // Render breadcrumb with just "Home" (not clickable at root)
    const breadcrumb = document.getElementById('breadcrumb');
    breadcrumb.innerHTML = '';
    const root = document.createElement('span');
    root.className = 'breadcrumb-item breadcrumb-home';
    root.innerHTML = '<svg viewBox="0 0 24 24" width="16" height="16"><path fill="currentColor" d="M10 20v-6h4v6h5v-8h3L12 3 2 12h3v8z"/></svg>';
    breadcrumb.appendChild(root);

    // Hide play all button and pagination
    document.getElementById('playAllBtn').style.display = 'none';
    document.getElementById('browserPagination').style.display = 'none';

    // Render folders as grid cards
    const container = document.getElementById('browserGrid');
    revokeBlobUrls(container);
    if (viewMode === 'list') {
        container.className = 'browser-list';
    } else if (viewMode === 'compact') {
        container.className = 'browser-grid browser-grid-compact';
    } else {
        container.className = 'browser-grid';
    }
    container.innerHTML = '';

    Object.entries(mediaFolders).forEach(([id, folder]) => {
        if (!folder.enabled) return;

        if (viewMode === 'list') {
            const row = document.createElement('div');
            row.className = 'browser-list-item';
            row.onclick = () => {
                currentFolderId = id;
                browsePath(id, '');
            };
            row.innerHTML = `
                <div class="browser-list-icon">\u{1F4C1}</div>
                <div class="browser-list-name">${folder.label}</div>
            `;
            container.appendChild(row);
        } else {
            const card = document.createElement('div');
            card.className = 'browser-item';
            card.onclick = () => {
                currentFolderId = id;
                browsePath(id, '');
            };
            card.innerHTML = `
                <div class="browser-thumb-wrapper">
                    <div class="browser-icon">\u{1F4C1}</div>
                </div>
                <div class="browser-item-info">
                    <div class="browser-item-name">${folder.label}</div>
                </div>
            `;
            container.appendChild(card);
        }
    });
}

async function browsePath(folderId, path, offset = 0, nocache = false) {
    // Clear search when navigating
    showBrowserSearch(false);

    try {
        const token = localStorage.getItem('media_server_token');
        if (!token) {
            console.error('No API token found');
            return;
        }

        // Show loading spinner
        const container = document.getElementById('browserGrid');
        container.className = 'browser-grid';
        container.innerHTML = '<div class="browser-loading"><div class="loading-spinner"></div></div>';

        const encodedPath = encodeURIComponent(path);
        let url = `/api/browser/browse?folder_id=${folderId}&path=${encodedPath}&offset=${offset}&limit=${itemsPerPage}`;
        if (nocache) url += '&nocache=true';
        const response = await fetch(
            url,
            { headers: { 'Authorization': `Bearer ${token}` } }
        );

        if (!response.ok) {
            let errorMsg = 'Failed to browse path';
            if (response.status === 503) {
                const errorData = await response.json().catch(() => ({}));
                errorMsg = errorData.detail || 'Folder is temporarily unavailable (network share not accessible)';
            }
            throw new Error(errorMsg);
        }

        const data = await response.json();
        currentPath = data.current_path;
        currentOffset = offset;
        totalItems = data.total;

        cachedItems = data.items;
        renderBreadcrumbs(data.current_path, data.parent_path);
        renderBrowserItems(cachedItems);
        renderPagination();

        // Show search bar when inside a folder
        showBrowserSearch(true);

        // Show/hide Play All button based on whether media items exist
        const hasMedia = data.items.some(item => item.is_media);
        document.getElementById('playAllBtn').style.display = hasMedia ? '' : 'none';

        // Save last path
        saveLastBrowserPath(folderId, currentPath);
    } catch (error) {
        console.error('Error browsing path:', error);
        const errorMsg = error.message || t('browser.error_loading');
        showToast(errorMsg, 'error');
        clearBrowserGrid();
    }
}

function renderBreadcrumbs(currentPath, parentPath) {
    const breadcrumb = document.getElementById('breadcrumb');
    breadcrumb.innerHTML = '';

    const parts = (currentPath || '').split('/').filter(p => p);
    let path = '/';

    // Home link (back to folder list)
    const home = document.createElement('span');
    home.className = 'breadcrumb-item breadcrumb-home';
    home.innerHTML = '<svg viewBox="0 0 24 24" width="16" height="16"><path fill="currentColor" d="M10 20v-6h4v6h5v-8h3L12 3 2 12h3v8z"/></svg>';
    home.onclick = () => showRootFolders();
    breadcrumb.appendChild(home);

    // Separator + Folder name
    const sep = document.createElement('span');
    sep.className = 'breadcrumb-separator';
    sep.textContent = '\u203A';
    breadcrumb.appendChild(sep);

    const folderItem = document.createElement('span');
    folderItem.className = 'breadcrumb-item';
    folderItem.textContent = mediaFolders[currentFolderId]?.label || 'Root';
    if (parts.length > 0) {
        folderItem.onclick = () => browsePath(currentFolderId, '');
    }
    breadcrumb.appendChild(folderItem);

    // Path parts
    parts.forEach((part, index) => {
        // Separator
        const separator = document.createElement('span');
        separator.className = 'breadcrumb-separator';
        separator.textContent = '\u203A';
        breadcrumb.appendChild(separator);

        // Part
        path += (path === '/' ? '' : '/') + part;
        const item = document.createElement('span');
        item.className = 'breadcrumb-item';
        item.textContent = part;
        const itemPath = path;
        item.onclick = () => browsePath(currentFolderId, itemPath);
        breadcrumb.appendChild(item);
    });
}

function revokeBlobUrls(container) {
    const cachedUrls = new Set(thumbnailCache.values());
    container.querySelectorAll('img[src^="blob:"]').forEach(img => {
        // Don't revoke URLs managed by the thumbnail cache
        if (!cachedUrls.has(img.src)) {
            URL.revokeObjectURL(img.src);
        }
    });
}

function renderBrowserItems(items) {
    const container = document.getElementById('browserGrid');
    revokeBlobUrls(container);
    // Switch container class based on view mode
    if (viewMode === 'list') {
        container.className = 'browser-list';
        renderBrowserList(items, container);
    } else if (viewMode === 'compact') {
        container.className = 'browser-grid browser-grid-compact';
        renderBrowserGrid(items, container);
    } else {
        container.className = 'browser-grid';
        renderBrowserGrid(items, container);
    }
}

function renderBrowserList(items, container) {
    container.innerHTML = '';

    if (!items || items.length === 0) {
        container.innerHTML = `<div class="browser-empty">${emptyStateHtml(EMPTY_SVG_FILE, t('browser.no_items'))}</div>`;
        return;
    }

    items.forEach((item, idx) => {
        const row = document.createElement('div');
        row.className = 'browser-list-item';
        row.style.setProperty('--item-index', Math.min(idx, 20));
        row.dataset.name = item.name;
        row.dataset.type = item.type;

        // Icon (small) with play overlay
        const icon = document.createElement('div');
        icon.className = 'browser-list-icon';

        if (item.is_media && item.type === 'audio') {
            const thumbnail = document.createElement('img');
            thumbnail.className = 'browser-list-thumbnail loading';
            thumbnail.alt = item.name;
            icon.appendChild(thumbnail);
            loadThumbnail(thumbnail, item.name);
        } else {
            icon.textContent = getFileIcon(item.type);
        }

        if (item.is_media) {
            const overlay = document.createElement('div');
            overlay.className = 'browser-list-play-overlay';
            overlay.innerHTML = '<svg viewBox="0 0 24 24"><path fill="currentColor" d="M8 5v14l11-7z"/></svg>';
            icon.appendChild(overlay);
        }
        row.appendChild(icon);

        // Name (show media title if available)
        const name = document.createElement('div');
        name.className = 'browser-list-name';
        name.textContent = item.title || item.name;
        row.appendChild(name);

        // Bitrate
        const br = document.createElement('div');
        br.className = 'browser-list-bitrate';
        br.textContent = formatBitrate(item.bitrate) || '';
        row.appendChild(br);

        // Duration
        const dur = document.createElement('div');
        dur.className = 'browser-list-duration';
        dur.textContent = formatDuration(item.duration) || '';
        row.appendChild(dur);

        // Size
        const size = document.createElement('div');
        size.className = 'browser-list-size';
        size.textContent = (item.size !== null && item.type !== 'folder') ? formatFileSize(item.size) : '';
        row.appendChild(size);

        // Download button
        if (item.is_media) {
            row.appendChild(createDownloadBtn(item.name, 'browser-list-download'));
        } else {
            row.appendChild(document.createElement('div'));
        }

        // Tooltip: show filename when title is displayed, or when name is ellipsed
        row.addEventListener('mouseenter', () => {
            if (item.title || name.scrollWidth > name.clientWidth) {
                row.title = item.name;
            } else {
                row.title = '';
            }
        });

        // Single click: play media or navigate folder
        row.onclick = () => {
            if (item.type === 'folder') {
                const newPath = currentPath === '/'
                    ? '/' + item.name
                    : currentPath + '/' + item.name;
                browsePath(currentFolderId, newPath);
            } else if (item.is_media) {
                playMediaFile(item.name);
            }
        };

        container.appendChild(row);
    });
}

function renderBrowserGrid(items, container) {
    container = container || document.getElementById('browserGrid');
    container.innerHTML = '';

    if (!items || items.length === 0) {
        container.innerHTML = `<div class="browser-empty">${emptyStateHtml(EMPTY_SVG_FILE, t('browser.no_items'))}</div>`;
        return;
    }

    items.forEach((item, idx) => {
        const div = document.createElement('div');
        div.className = 'browser-item';
        div.style.setProperty('--item-index', Math.min(idx, 20));
        div.dataset.name = item.name;
        div.dataset.type = item.type;

        // Type badge
        if (item.type !== 'folder') {
            const typeBadge = document.createElement('div');
            typeBadge.className = `browser-item-type ${item.type}`;
            typeBadge.innerHTML = getTypeBadgeIcon(item.type);
            div.appendChild(typeBadge);
        }

        // Thumbnail wrapper (for play overlay)
        const thumbWrapper = document.createElement('div');
        thumbWrapper.className = 'browser-thumb-wrapper';

        // Thumbnail or icon
        if (item.is_media && item.type === 'audio') {
            const thumbnail = document.createElement('img');
            thumbnail.className = 'browser-thumbnail loading';
            thumbnail.alt = item.name;
            thumbWrapper.appendChild(thumbnail);

            // Lazy load thumbnail
            loadThumbnail(thumbnail, item.name);
        } else {
            const icon = document.createElement('div');
            icon.className = 'browser-icon';
            icon.textContent = getFileIcon(item.type);
            thumbWrapper.appendChild(icon);
        }

        // Play overlay for media files
        if (item.is_media) {
            const overlay = document.createElement('div');
            overlay.className = 'browser-play-overlay';
            overlay.innerHTML = '<svg viewBox="0 0 24 24"><path fill="currentColor" d="M8 5v14l11-7z"/></svg>';
            thumbWrapper.appendChild(overlay);
        }

        div.appendChild(thumbWrapper);

        // Info
        const info = document.createElement('div');
        info.className = 'browser-item-info';

        const name = document.createElement('div');
        name.className = 'browser-item-name';
        name.textContent = item.title || item.name;
        info.appendChild(name);

        if (item.type !== 'folder') {
            const meta = document.createElement('div');
            meta.className = 'browser-item-meta';
            const parts = [];
            const duration = formatDuration(item.duration);
            if (duration) parts.push(duration);
            const bitrate = formatBitrate(item.bitrate);
            if (bitrate) parts.push(bitrate);
            if (item.size !== null) parts.push(formatFileSize(item.size));
            meta.textContent = parts.join(' \u00B7 ');
            if (parts.length) info.appendChild(meta);
        }

        div.appendChild(info);

        // Tooltip: show filename when title is displayed, or when name is ellipsed
        div.addEventListener('mouseenter', () => {
            if (item.title || name.scrollWidth > name.clientWidth || name.scrollHeight > name.clientHeight) {
                div.title = item.name;
            } else {
                div.title = '';
            }
        });

        // Single click: play media or navigate folder
        div.onclick = () => {
            if (item.type === 'folder') {
                const newPath = currentPath === '/'
                    ? '/' + item.name
                    : currentPath + '/' + item.name;
                browsePath(currentFolderId, newPath);
            } else if (item.is_media) {
                playMediaFile(item.name);
            }
        };

        container.appendChild(div);
    });
}

function getTypeBadgeIcon(type) {
    const svgs = {
        'audio': '<svg viewBox="0 0 24 24" width="10" height="10"><path fill="currentColor" d="M12 3v10.55c-.59-.34-1.27-.55-2-.55-2.21 0-4 1.79-4 4s1.79 4 4 4 4-1.79 4-4V7h4V3h-6z"/></svg>',
        'video': '<svg viewBox="0 0 24 24" width="10" height="10"><path fill="currentColor" d="M17 10.5V7c0-.55-.45-1-1-1H4c-.55 0-1 .45-1 1v10c0 .55.45 1 1 1h12c.55 0 1-.45 1-1v-3.5l4 4v-11l-4 4z"/></svg>',
    };
    return svgs[type] || '';
}

function getFileIcon(type) {
    const icons = {
        'folder': '\u{1F4C1}',
        'audio': '\u{1F3B5}',
        'video': '\u{1F3AC}',
        'other': '\u{1F4C4}'
    };
    return icons[type] || icons.other;
}

function formatFileSize(bytes) {
    if (bytes === 0) return '0 B';
    const k = 1024;
    const sizes = ['B', 'KB', 'MB', 'GB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return (bytes / Math.pow(k, i)).toFixed(1) + ' ' + sizes[i];
}

function formatDuration(seconds) {
    if (seconds == null || seconds <= 0) return null;
    const h = Math.floor(seconds / 3600);
    const m = Math.floor((seconds % 3600) / 60);
    const s = Math.floor(seconds % 60);
    if (h > 0) {
        return `${h}:${String(m).padStart(2, '0')}:${String(s).padStart(2, '0')}`;
    }
    return `${m}:${String(s).padStart(2, '0')}`;
}

function formatBitrate(bps) {
    if (bps == null || bps <= 0) return null;
    return Math.round(bps / 1000) + ' kbps';
}

async function loadThumbnail(imgElement, fileName) {
    try {
        const token = localStorage.getItem('media_server_token');
        if (!token) {
            console.error('No API token found');
            return;
        }

        const absolutePath = buildAbsolutePath(currentFolderId, currentPath, fileName);

        // Check cache first
        if (thumbnailCache.has(absolutePath)) {
            const cachedUrl = thumbnailCache.get(absolutePath);
            imgElement.onload = () => {
                imgElement.classList.remove('loading');
                imgElement.classList.add('loaded');
            };
            imgElement.src = cachedUrl;
            return;
        }

        const encodedPath = encodeURIComponent(absolutePath);

        const response = await fetch(
            `/api/browser/thumbnail?path=${encodedPath}&size=medium`,
            { headers: { 'Authorization': `Bearer ${token}` } }
        );

        if (response.status === 200) {
            const blob = await response.blob();
            const url = URL.createObjectURL(blob);
            thumbnailCache.set(absolutePath, url);

            // Evict oldest entries when cache exceeds limit
            if (thumbnailCache.size > THUMBNAIL_CACHE_MAX) {
                const oldest = thumbnailCache.keys().next().value;
                URL.revokeObjectURL(thumbnailCache.get(oldest));
                thumbnailCache.delete(oldest);
            }

            // Wait for image to actually load before showing it
            imgElement.onload = () => {
                imgElement.classList.remove('loading');
                imgElement.classList.add('loaded');
            };

            // Revoke previous blob URL if not managed by cache
            // (Cache is keyed by path, so check values)
            if (imgElement.src && imgElement.src.startsWith('blob:')) {
                let isCached = false;
                for (const url of thumbnailCache.values()) {
                    if (url === imgElement.src) { isCached = true; break; }
                }
                if (!isCached) URL.revokeObjectURL(imgElement.src);
            }
            imgElement.src = url;
        } else {
            // Fallback to icon (204 = no thumbnail available)
            const parent = imgElement.parentElement;
            const isList = parent.classList.contains('browser-list-icon');
            imgElement.remove();
            if (isList) {
                parent.textContent = '\u{1F3B5}';
            } else {
                const icon = document.createElement('div');
                icon.className = 'browser-icon';
                icon.textContent = '\u{1F3B5}';
                parent.insertBefore(icon, parent.firstChild);
            }
        }
    } catch (error) {
        console.error('Error loading thumbnail:', error);
        imgElement.classList.remove('loading');
    }
}

function buildAbsolutePath(folderId, relativePath, fileName) {
    const folderPath = mediaFolders[folderId].path;
    // Detect separator from folder path
    const sep = folderPath.includes('/') ? '/' : '\\';
    const fullRelative = relativePath === '/'
        ? sep + fileName
        : relativePath.replace(/[/\\]/g, sep) + sep + fileName;
    return folderPath + fullRelative;
}

let playInProgress = false;

async function playMediaFile(fileName) {
    if (playInProgress) return;
    playInProgress = true;
    try {
        const token = localStorage.getItem('media_server_token');
        if (!token) {
            console.error('No API token found');
            return;
        }

        const absolutePath = buildAbsolutePath(currentFolderId, currentPath, fileName);

        const response = await fetch('/api/browser/play', {
            method: 'POST',
            headers: {
                'Authorization': `Bearer ${token}`,
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ path: absolutePath })
        });

        if (!response.ok) throw new Error('Failed to play file');

        showToast(t('browser.play_success', { filename: fileName }), 'success');
    } catch (error) {
        console.error('Error playing file:', error);
        showToast(t('browser.play_error'), 'error');
    } finally {
        playInProgress = false;
    }
}

async function playAllFolder() {
    if (playInProgress) return;
    playInProgress = true;
    const btn = document.getElementById('playAllBtn');
    if (btn) btn.disabled = true;
    try {
        const token = localStorage.getItem('media_server_token');
        if (!token || !currentFolderId) return;

        const response = await fetch('/api/browser/play-folder', {
            method: 'POST',
            headers: {
                'Authorization': `Bearer ${token}`,
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ folder_id: currentFolderId, path: currentPath })
        });

        if (!response.ok) {
            const err = await response.json().catch(() => ({}));
            throw new Error(err.detail || 'Failed to play folder');
        }

        const data = await response.json();
        showToast(t('browser.play_all_success', { count: data.count }), 'success');
    } catch (error) {
        console.error('Error playing folder:', error);
        showToast(t('browser.play_all_error'), 'error');
    } finally {
        playInProgress = false;
        if (btn) btn.disabled = false;
    }
}

async function downloadFile(fileName, event) {
    if (event) event.stopPropagation();
    const token = localStorage.getItem('media_server_token');
    if (!token) return;

    const fullPath = currentPath === '/'
        ? '/' + fileName
        : currentPath + '/' + fileName;
    const encodedPath = encodeURIComponent(fullPath);

    try {
        const response = await fetch(
            `/api/browser/download?folder_id=${currentFolderId}&path=${encodedPath}`,
            { headers: { 'Authorization': `Bearer ${token}` } }
        );
        if (!response.ok) throw new Error('Download failed');

        const blob = await response.blob();
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = fileName;
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        URL.revokeObjectURL(url);
    } catch (error) {
        console.error('Download error:', error);
        showToast(t('browser.download_error'), 'error');
    }
}

function createDownloadBtn(fileName, cssClass) {
    const btn = document.createElement('button');
    btn.className = cssClass;
    btn.innerHTML = '<svg viewBox="0 0 24 24" width="14" height="14"><path fill="currentColor" d="M19 9h-4V3H9v6H5l7 7 7-7zM5 18v2h14v-2H5z"/></svg>';
    btn.title = t('browser.download');
    btn.onclick = (e) => downloadFile(fileName, e);
    return btn;
}

function renderPagination() {
    const pagination = document.getElementById('browserPagination');
    const prevBtn = document.getElementById('prevPage');
    const nextBtn = document.getElementById('nextPage');
    const pageInput = document.getElementById('pageInput');
    const pageTotal = document.getElementById('pageTotal');

    const totalPages = Math.ceil(totalItems / itemsPerPage);
    const currentPage = Math.floor(currentOffset / itemsPerPage) + 1;

    if (totalPages <= 1) {
        pagination.style.display = 'none';
        return;
    }

    pagination.style.display = 'flex';
    pageInput.value = currentPage;
    pageInput.max = totalPages;
    pageTotal.textContent = `/ ${totalPages}`;

    prevBtn.disabled = currentPage === 1;
    nextBtn.disabled = currentPage === totalPages;
}

function previousPage() {
    if (currentOffset >= itemsPerPage) {
        browsePath(currentFolderId, currentPath, currentOffset - itemsPerPage);
    }
}

function nextPage() {
    if (currentOffset + itemsPerPage < totalItems) {
        browsePath(currentFolderId, currentPath, currentOffset + itemsPerPage);
    }
}

function refreshBrowser() {
    if (currentFolderId) {
        browsePath(currentFolderId, currentPath, currentOffset, true);
    } else {
        loadMediaFolders();
    }
}

// Browser search
function onBrowserSearch() {
    const input = document.getElementById('browserSearchInput');
    const clearBtn = document.getElementById('browserSearchClear');
    const term = input.value.trim();

    clearBtn.style.display = term ? 'flex' : 'none';

    // Debounce: wait 200ms after typing stops
    if (browserSearchTimer) clearTimeout(browserSearchTimer);
    browserSearchTimer = setTimeout(() => {
        browserSearchTerm = term.toLowerCase();
        applyBrowserSearch();
    }, SEARCH_DEBOUNCE_MS);
}

function clearBrowserSearch() {
    const input = document.getElementById('browserSearchInput');
    input.value = '';
    document.getElementById('browserSearchClear').style.display = 'none';
    browserSearchTerm = '';
    applyBrowserSearch();
    input.focus();
}

function applyBrowserSearch() {
    if (!cachedItems) return;

    if (!browserSearchTerm) {
        renderBrowserItems(cachedItems);
        return;
    }

    const filtered = cachedItems.filter(item =>
        item.name.toLowerCase().includes(browserSearchTerm) ||
        (item.title && item.title.toLowerCase().includes(browserSearchTerm))
    );
    renderBrowserItems(filtered);
}

function showBrowserSearch(visible) {
    document.getElementById('browserSearchWrapper').style.display = visible ? '' : 'none';
    if (!visible) {
        document.getElementById('browserSearchInput').value = '';
        document.getElementById('browserSearchClear').style.display = 'none';
        browserSearchTerm = '';
    }
}

function setViewMode(mode) {
    if (mode === viewMode) return;
    viewMode = mode;
    localStorage.setItem('mediaBrowser.viewMode', mode);

    // Update toggle buttons
    document.querySelectorAll('.view-toggle-btn').forEach(btn => btn.classList.remove('active'));
    const btnId = mode === 'list' ? 'viewListBtn' : mode === 'compact' ? 'viewCompactBtn' : 'viewGridBtn';
    document.getElementById(btnId).classList.add('active');

    // Re-render current view from cache (no network request)
    if (currentFolderId && cachedItems) {
        applyBrowserSearch();
    } else {
        showRootFolders();
    }
}

function onItemsPerPageChanged() {
    const select = document.getElementById('itemsPerPageSelect');
    itemsPerPage = parseInt(select.value);
    localStorage.setItem('mediaBrowser.itemsPerPage', itemsPerPage);

    // Reset to first page and reload
    if (currentFolderId) {
        currentOffset = 0;
        browsePath(currentFolderId, currentPath, 0);
    }
}

function goToPage() {
    const pageInput = document.getElementById('pageInput');
    const totalPages = Math.ceil(totalItems / itemsPerPage);
    let page = parseInt(pageInput.value);

    if (isNaN(page) || page < 1) page = 1;
    if (page > totalPages) page = totalPages;

    pageInput.value = page;
    const newOffset = (page - 1) * itemsPerPage;
    if (newOffset !== currentOffset) {
        browsePath(currentFolderId, currentPath, newOffset);
    }
}

function initBrowserToolbar() {
    // Restore view mode
    const savedViewMode = localStorage.getItem('mediaBrowser.viewMode') || 'grid';
    viewMode = savedViewMode;
    document.querySelectorAll('.view-toggle-btn').forEach(btn => btn.classList.remove('active'));
    const btnId = savedViewMode === 'list' ? 'viewListBtn' : savedViewMode === 'compact' ? 'viewCompactBtn' : 'viewGridBtn';
    document.getElementById(btnId).classList.add('active');

    // Restore items per page
    const savedItemsPerPage = localStorage.getItem('mediaBrowser.itemsPerPage');
    if (savedItemsPerPage) {
        itemsPerPage = parseInt(savedItemsPerPage);
        document.getElementById('itemsPerPageSelect').value = savedItemsPerPage;
    }
}

function clearBrowserGrid() {
    const grid = document.getElementById('browserGrid');
    grid.innerHTML = `<div class="browser-empty">${emptyStateHtml(EMPTY_SVG_FOLDER, t('browser.no_folder_selected'))}</div>`;
    document.getElementById('breadcrumb').innerHTML = '';
    document.getElementById('browserPagination').style.display = 'none';
    document.getElementById('playAllBtn').style.display = 'none';
}

// LocalStorage for last path
function saveLastBrowserPath(folderId, path) {
    try {
        localStorage.setItem('mediaBrowser.lastFolderId', folderId);
        localStorage.setItem('mediaBrowser.lastPath', path);
    } catch (e) {
        console.error('Failed to save last browser path:', e);
    }
}

function loadLastBrowserPath() {
    try {
        const lastFolderId = localStorage.getItem('mediaBrowser.lastFolderId');
        const lastPath = localStorage.getItem('mediaBrowser.lastPath');

        if (lastFolderId && mediaFolders[lastFolderId]) {
            currentFolderId = lastFolderId;
            browsePath(lastFolderId, lastPath || '');
        } else {
            showRootFolders();
        }
    } catch (e) {
        console.error('Failed to load last browser path:', e);
        showRootFolders();
    }
}

// Folder Management
function showManageFoldersDialog() {
    // TODO: Implement folder management UI
    // For now, show a simple alert
    showToast(t('browser.manage_folders_hint'), 'info');
}

function closeFolderDialog() {
    closeDialog(document.getElementById('folderDialog'));
}

async function saveFolder(event) {
    event.preventDefault();
    // TODO: Implement folder save functionality
    closeFolderDialog();
}