import { api } from '../api.js';

export class RecentFiles extends HTMLElement {
    constructor() {
        super();
        this.recentFiles = [];
    }

    async connectedCallback() {
        await this.loadRecentFiles();
    }

    async loadRecentFiles() {
        try {
            this.recentFiles = await api.listRecentFiles();
            this.render();
        } catch (error) {
            console.error('Failed to load recent files:', error);
            document.dispatchEvent(new CustomEvent('show-toast', {
                detail: { message: 'Failed to load recent files: ' + error.message, type: 'error' }
            }));
        }
    }

    render() {
        if (this.recentFiles.length === 0) {
            this.innerHTML = `
                <div class="recent-files-container">
                    <h2>Recent Files</h2>
                    <p class="empty-state">No recent files found.</p>
                </div>
            `;
            return;
        }

        this.innerHTML = `
            <div class="recent-files-container">
                <h2>Recent Files</h2>
                <div class="file-grid">
                    ${this.recentFiles.map(file => this.renderFile(file)).join('')}
                </div>
            </div>
        `;
        this.attachListeners();
    }

    renderFile(file) {
        const icon = this.getFileIcon(file.mime_type);
        const size = this.formatFileSize(file.size);
        const lastAccessed = file.last_accessed_at ? new Date(file.last_accessed_at).toLocaleString() : 'N/A';

        return `
            <div class="file-item" data-file-id="${file.id}">
                <div class="file-icon">${icon}</div>
                <div class="file-name">${file.name}</div>
                <div class="file-size">${size}</div>
                <div class="file-last-accessed">Accessed: ${lastAccessed}</div>
                <div class="file-actions-menu">
                    <button class="action-btn" data-action="download" data-id="${file.id}">Download</button>
                </div>
            </div>
        `;
    }

    getFileIcon(mimeType) {
        if (mimeType.startsWith('image/')) return '&#128247;';
        if (mimeType.startsWith('video/')) return '&#127909;';
        if (mimeType.startsWith('audio/')) return '&#127925;';
        if (mimeType.includes('pdf')) return '&#128196;';
        if (mimeType.includes('text')) return '&#128196;';
        return '&#128196;';
    }

    formatFileSize(bytes) {
        if (bytes < 1024) return bytes + ' B';
        if (bytes < 1048576) return (bytes / 1024).toFixed(1) + ' KB';
        if (bytes < 1073741824) return (bytes / 1048576).toFixed(1) + ' MB';
        return (bytes / 1073741824).toFixed(1) + ' GB';
    }

    attachListeners() {
        this.querySelectorAll('.action-btn').forEach(btn => {
            btn.addEventListener('click', async (e) => {
                e.stopPropagation();
                const action = btn.dataset.action;
                const id = parseInt(btn.dataset.id);
                if (action === 'download') {
                    await this.handleDownload(id);
                }
            });
        });
    }

    async handleDownload(fileId) {
        try {
            const blob = await api.downloadFile(fileId);
            const file = this.recentFiles.find(f => f.id === fileId);
            const url = URL.createObjectURL(blob);
            const a = document.createElement('a');
            a.href = url;
            a.download = file.name;
            a.click();
            URL.revokeObjectURL(url);
            document.dispatchEvent(new CustomEvent('show-toast', {
                detail: { message: 'File downloaded successfully!', type: 'success' }
            }));
        } catch (error) {
            document.dispatchEvent(new CustomEvent('show-toast', {
                detail: { message: 'Failed to download file: ' + error.message, type: 'error' }
            }));
        }
    }
}

customElements.define('recent-files', RecentFiles);