import assert from 'node:assert/strict'
import test from 'node:test'

import { parseDefaultDistro, resolvePickerDefaultPath, wslPosixToWindowsAccessible } from './wsl-path-bridge'

test('parseDefaultDistro reads the first distro from clean utf-8 output', () => {
  assert.equal(parseDefaultDistro('Ubuntu\nDebian\n'), 'Ubuntu')
})

test('parseDefaultDistro survives UTF-16LE NUL bytes older wsl.exe leaves in (WSL#4607)', () => {
  // `wsl.exe -l -q` emits UTF-16LE without a BOM on builds that ignore
  // WSL_UTF8; decoded as utf8 that reads as NUL-interleaved text.
  const utf16ish = '\0U\0b\0u\0n\0t\0u\0\r\0\n\0D\0e\0b\0i\0a\0n\0'
  assert.equal(parseDefaultDistro(utf16ish), 'Ubuntu')
})

test('parseDefaultDistro strips the default-marker and blank lines', () => {
  assert.equal(parseDefaultDistro('\n* Ubuntu\nDebian\n'), 'Ubuntu')
  assert.equal(parseDefaultDistro('   \n\n'), null)
})

test('wslPosixToWindowsAccessible maps a drvfs mount to its Windows drive', () => {
  assert.equal(wslPosixToWindowsAccessible('/mnt/c/Users/alex', 'Ubuntu'), 'C:\\Users\\alex')
  assert.equal(wslPosixToWindowsAccessible('/mnt/d', 'Ubuntu'), 'D:\\')
})

test('wslPosixToWindowsAccessible maps an in-distro POSIX path to a UNC share', () => {
  assert.equal(wslPosixToWindowsAccessible('/home/alex/proj', 'Ubuntu'), '\\\\wsl.localhost\\Ubuntu\\home\\alex\\proj')
})

test('wslPosixToWindowsAccessible leaves non-absolute / already-Windows paths alone', () => {
  assert.equal(wslPosixToWindowsAccessible('C:\\Users\\alex', 'Ubuntu'), 'C:\\Users\\alex')
  assert.equal(wslPosixToWindowsAccessible('relative/dir', 'Ubuntu'), 'relative/dir')
})

test('resolvePickerDefaultPath bridges a WSL cwd but passes Windows paths and empties through', () => {
  assert.equal(resolvePickerDefaultPath('/home/alex', 'Ubuntu'), '\\\\wsl.localhost\\Ubuntu\\home\\alex')
  assert.equal(resolvePickerDefaultPath('C:\\proj', 'Ubuntu'), 'C:\\proj')
  assert.equal(resolvePickerDefaultPath(undefined, 'Ubuntu'), undefined)
})