initial commit

lib/utils.ts

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+import { clsx, type ClassValue } from 'clsx'
+import { twMerge } from 'tailwind-merge'
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs))
+}
+
+export function formatDuration(seconds: number): string {
+  const hours = Math.floor(seconds / 3600)
+  const minutes = Math.floor((seconds % 3600) / 60)
+  const secs = seconds % 60
+  
+  if (hours > 0) {
+    return hours + 'h ' + minutes + 'm'
+  }
+  return minutes + 'm ' + secs + 's'
+}
+
+export function formatTime(seconds: number): string {
+  const hours = Math.floor(seconds / 3600)
+  const minutes = Math.floor((seconds % 3600) / 60)
+  const secs = Math.floor(seconds % 60)
+  
+  if (hours > 0) {
+    return hours + ':' + String(minutes).padStart(2, '0') + ':' + String(secs).padStart(2, '0')
+  }
+  return minutes + ':' + String(secs).padStart(2, '0')
+}
+
+export function slugify(text: string): string {
+  const result = text
+    .toLowerCase()
+    .trim()
+    .replace(/[^\w\s-]/g, '')
+    .replace(/[\s_-]+/g, '-')
+    .replace(/^-+|-+$/g, '')
+  return result || 'lesson'
+}
+
+export function getMimeType(filename: string): string {
+  const ext = filename.split('.').pop()?.toLowerCase()
+  const mimeTypes: Record<string, string> = {
+    mp4: 'video/mp4',
+    mkv: 'video/x-matroska',
+    webm: 'video/webm',
+    mov: 'video/quicktime',
+    avi: 'video/x-msvideo',
+    mp3: 'audio/mpeg',
+    wav: 'audio/wav',
+    m4a: 'audio/mp4',
+    pdf: 'application/pdf',
+    md: 'text/markdown',
+    html: 'text/html',
+    htm: 'text/html',
+    json: 'application/json',
+    txt: 'text/plain',
+    jpg: 'image/jpeg',
+    jpeg: 'image/jpeg',
+    png: 'image/png',
+    gif: 'image/gif',
+    webp: 'image/webp',
+    srt: 'text/plain',
+    vtt: 'text/vtt',
+  }
+  return mimeTypes[ext || ''] || 'application/octet-stream'
+}
+
+export function getLessonType(mimeType: string): string {
+  if (mimeType.startsWith('video/')) return 'VIDEO'
+  if (mimeType.startsWith('audio/')) return 'AUDIO'
+  if (mimeType === 'application/pdf') return 'PDF'
+  if (mimeType === 'text/markdown') return 'MARKDOWN'
+  if (mimeType.startsWith('text/html')) return 'HTML'
+  if (mimeType === 'application/json') return 'JSON'
+  if (mimeType === 'text/plain') return 'TEXT'
+  if (mimeType === 'text/vtt') return 'VTT'
+  if (mimeType.startsWith('image/')) return 'IMAGE'
+  return 'OTHER'
+}
+
+export function isVideoType(type: string): boolean {
+  return type === 'VIDEO'
+}
+
+export function isDocumentType(type: string): boolean {
+  return ['PDF', 'MARKDOWN', 'HTML'].includes(type)
+}