import { describe, it, expect } from 'vitest'
import { sanitizeFilename } from './youtube'

describe('sanitizeFilename', () => {
  it('replaces special characters with underscores', () => {
    expect(sanitizeFilename('My Video!@#$%')).toBe('My_Video_')
    expect(sanitizeFilename('hello world')).toBe('hello_world')
    expect(sanitizeFilename('file/with\\slashes')).toBe('file_with_slashes')
  })

  it('collapses multiple underscores', () => {
    expect(sanitizeFilename('a!!!b')).toBe('a_b')
    expect(sanitizeFilename('test   file')).toBe('test_file')
    expect(sanitizeFilename('no___multiple___underscores')).toBe('no_multiple_underscores')
  })

  it('preserves alphanumeric characters', () => {
    expect(sanitizeFilename('Video123')).toBe('Video123')
    expect(sanitizeFilename('ABC_xyz_123')).toBe('ABC_xyz_123')
    expect(sanitizeFilename('simple')).toBe('simple')
  })

  it('truncates to 200 characters', () => {
    const longName = 'a'.repeat(250)
    expect(sanitizeFilename(longName).length).toBe(200)
    expect(sanitizeFilename(longName)).toBe('a'.repeat(200))
  })

  it('handles edge cases', () => {
    expect(sanitizeFilename('')).toBe('')
    expect(sanitizeFilename('   ')).toBe('_')
    expect(sanitizeFilename('___')).toBe('_')
  })

  it('handles unicode and emoji', () => {
    expect(sanitizeFilename('日本語タイトル')).toBe('_')
    expect(sanitizeFilename('Café')).toBe('Caf_')
    expect(sanitizeFilename('🎵 Music 🎵')).toBe('_Music_')
  })

  it('handles typical YouTube video titles', () => {
    expect(sanitizeFilename('Never Gonna Give You Up (Official Video)')).toBe('Never_Gonna_Give_You_Up_Official_Video_')
    expect(sanitizeFilename("Lofi Hip Hop Radio 📚 - Beats to Relax/Study")).toBe('Lofi_Hip_Hop_Radio_Beats_to_Relax_Study')
    expect(sanitizeFilename('[4K] Amazing Nature Video')).toBe('_4K_Amazing_Nature_Video')
    expect(sanitizeFilename('Song Title | Artist Name (Lyrics)')).toBe('Song_Title_Artist_Name_Lyrics_')
  })
})

describe('format selection logic', () => {
  it('maps audio formats correctly', () => {
    const audioFormats = ['mp3', 'wav', 'm4a', 'opus'] as const

    audioFormats.forEach((format) => {
      expect(['mp3', 'wav', 'm4a', 'opus']).toContain(format)
    })
  })

  it('maps video formats correctly', () => {
    const videoFormats = ['mp4', 'webm', 'mkv', 'avi'] as const

    videoFormats.forEach((format) => {
      expect(['mp4', 'webm', 'mkv', 'avi']).toContain(format)
    })
  })
})