import { describe, it, expect } from 'vitest'
import { getFileName, isAllowedFile, getFileExtension } from '../fileUtils'

describe('fileUtils', () => {
  describe('getFileName', () => {
    it('should extract filename from Unix path', () => {
      expect(getFileName('/home/user/documents/file.md')).toBe('file.md')
    })

    it('should extract filename from Windows path', () => {
      expect(getFileName('C:\\Users\\test\\file.md')).toBe('file.md')
    })

    it('should return the input if it is already a filename', () => {
      expect(getFileName('file.md')).toBe('file.md')
    })

    it('should handle path with trailing slash', () => {
      expect(getFileName('/path/to/dir/')).toBe('dir')
    })


    it('should handle path with trailing backslash', () => {
      expect(getFileName('C:\\Users\\test\\')).toBe('test')
    })

    it('should handle mixed path separators', () => {
      expect(getFileName('C:\\Users/test\\file.md')).toBe('file.md')
    })
  })

  describe('getFileExtension', () => {
    it('should return lowercase extension', () => {
      expect(getFileExtension('file.MD')).toBe('.md')
    })

    it('should return .markdown extension', () => {
      expect(getFileExtension('file.markdown')).toBe('.markdown')
    })

    it('should return .txt extension', () => {
      expect(getFileExtension('notes.txt')).toBe('.txt')
    })

    it('should return empty string for no extension', () => {
      expect(getFileExtension('Makefile')).toBe('')
    })

    it('should return empty string for hidden files starting with dot', () => {
      expect(getFileExtension('.gitignore')).toBe('')
    })

    it('should extract extension from full path', () => {
      expect(getFileExtension('/home/user/file.md')).toBe('.md')
    })

    it('should extract extension from Windows path', () => {
      expect(getFileExtension('C:\\Users\\test\\file.MARKDOWN')).toBe('.markdown')
    })

    it('should handle file with multiple dots', () => {
      expect(getFileExtension('my.file.md')).toBe('.md')
    })
  })

  describe('isAllowedFile', () => {
    it('should return true for .md files', () => {
      expect(isAllowedFile('file.md')).toBe(true)
    })

    it('should return true for .markdown files', () => {
      expect(isAllowedFile('file.markdown')).toBe(true)
    })

    it('should return true for .txt files', () => {
      expect(isAllowedFile('file.txt')).toBe(true)
    })

    it('should return true for uppercase extensions', () => {
      expect(isAllowedFile('file.MD')).toBe(true)
    })

    it('should return false for .js files', () => {
      expect(isAllowedFile('file.js')).toBe(false)
    })

    it('should return false for .json files', () => {
      expect(isAllowedFile('file.json')).toBe(false)
    })

    it('should return false for files without extension', () => {
      expect(isAllowedFile('Makefile')).toBe(false)
    })

    it('should work with full paths', () => {
      expect(isAllowedFile('/home/user/doc.md')).toBe(true)
      expect(isAllowedFile('/home/user/script.py')).toBe(false)
    })
  })
})