/**
 * Live Captions - Recordings Panel
 * Handles viewing and managing saved recordings
 */

const Recordings = {
    // Current state
    recordings: [],
    currentRecording: null,

    // DOM elements
    elements: {},

    /**
     * Initialize the recordings panel
     */
    init() {
        this.cacheElements();
        this.bindEvents();
    },

    /**
     * Cache DOM element references
     */
    cacheElements() {
        this.elements = {
            btnRecordings: document.getElementById('btn-recordings'),
            btnClose: document.getElementById('btn-close-recordings'),
            btnBackToList: document.getElementById('btn-back-to-list'),
            btnDelete: document.getElementById('btn-delete-recording'),
            panel: document.getElementById('recordings-panel'),
            overlay: document.getElementById('overlay'),
            recordingsList: document.getElementById('recordings-list'),
            recordingViewer: document.getElementById('recording-viewer'),
            viewerFilename: document.getElementById('viewer-filename'),
            viewerContent: document.getElementById('viewer-content'),
        };
    },

    /**
     * Bind event listeners
     */
    bindEvents() {
        this.elements.btnRecordings.addEventListener('click', () => this.openPanel());
        this.elements.btnClose.addEventListener('click', () => this.closePanel());
        this.elements.btnBackToList.addEventListener('click', () => this.showList());
        this.elements.btnDelete.addEventListener('click', () => this.deleteCurrentRecording());

        // Close on overlay click (but check if it's not settings panel)
        this.elements.overlay.addEventListener('click', () => {
            if (!this.elements.panel.classList.contains('hidden')) {
                this.closePanel();
            }
        });
    },

    /**
     * Open the recordings panel
     */
    openPanel() {
        this.elements.panel.classList.remove('hidden');
        this.elements.overlay.classList.remove('hidden');
        this.showList();
        this.loadRecordings();
    },

    /**
     * Close the recordings panel
     */
    closePanel() {
        this.elements.panel.classList.add('hidden');
        this.elements.overlay.classList.add('hidden');
        this.currentRecording = null;
    },

    /**
     * Show the recordings list view
     */
    showList() {
        this.elements.recordingsList.classList.remove('hidden');
        this.elements.recordingViewer.classList.add('hidden');
    },

    /**
     * Show the recording viewer
     */
    showViewer() {
        this.elements.recordingsList.classList.add('hidden');
        this.elements.recordingViewer.classList.remove('hidden');
    },

    /**
     * Load recordings from the API
     */
    async loadRecordings() {
        this.elements.recordingsList.innerHTML = '<p class="recordings-empty">Loading recordings...</p>';

        try {
            const response = await fetch('/api/recordings');
            if (!response.ok) throw new Error('Failed to load recordings');

            this.recordings = await response.json();
            this.renderRecordingsList();
        } catch (error) {
            console.error('Error loading recordings:', error);
            this.elements.recordingsList.innerHTML =
                '<p class="recordings-empty">Failed to load recordings</p>';
        }
    },

    /**
     * Render the recordings list
     */
    renderRecordingsList() {
        if (this.recordings.length === 0) {
            this.elements.recordingsList.innerHTML =
                '<p class="recordings-empty">No recordings yet.<br>Enable auto-save and record some captions!</p>';
            return;
        }

        const html = this.recordings.map(recording => `
            <div class="recording-item" data-filename="${recording.filename}">
                <div class="recording-info">
                    <span class="recording-date">${recording.date}</span>
                    <span class="recording-meta">${this.formatFileSize(recording.size)}</span>
                </div>
                <span class="recording-arrow">&rsaquo;</span>
            </div>
        `).join('');

        this.elements.recordingsList.innerHTML = html;

        // Bind click events to items
        this.elements.recordingsList.querySelectorAll('.recording-item').forEach(item => {
            item.addEventListener('click', () => {
                const filename = item.dataset.filename;
                this.viewRecording(filename);
            });
        });
    },

    /**
     * Format file size in human-readable format
     */
    formatFileSize(bytes) {
        if (bytes < 1024) return bytes + ' B';
        if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
        return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
    },

    /**
     * View a specific recording
     */
    async viewRecording(filename) {
        try {
            const response = await fetch(`/api/recordings/${encodeURIComponent(filename)}`);
            if (!response.ok) throw new Error('Failed to load recording');

            const data = await response.json();
            this.currentRecording = filename;
            this.elements.viewerFilename.textContent = filename;
            this.elements.viewerContent.textContent = data.content;
            this.showViewer();
        } catch (error) {
            console.error('Error loading recording:', error);
            alert('Failed to load recording');
        }
    },

    /**
     * Delete the currently viewed recording
     */
    async deleteCurrentRecording() {
        if (!this.currentRecording) return;

        if (!confirm('Are you sure you want to delete this recording?')) {
            return;
        }

        try {
            const response = await fetch(`/api/recordings/${encodeURIComponent(this.currentRecording)}`, {
                method: 'DELETE'
            });

            if (!response.ok) throw new Error('Failed to delete recording');

            // Remove from local list
            this.recordings = this.recordings.filter(r => r.filename !== this.currentRecording);
            this.currentRecording = null;

            // Go back to list
            this.showList();
            this.renderRecordingsList();
        } catch (error) {
            console.error('Error deleting recording:', error);
            alert('Failed to delete recording');
        }
    }
};

// Initialize when DOM is ready
document.addEventListener('DOMContentLoaded', () => {
    Recordings.init();
});