import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs'
import * as os from 'node:os'
import * as path from 'node:path'
import { afterAll, beforeAll, describe, expect, it } from 'vitest'
import { fileAtRef } from './fileAt'
import { runGit } from './worktree'

describe('fileAtRef', () => {
  let repo: string
  let head: string

  beforeAll(async () => {
    repo = mkdtempSync(path.join(os.tmpdir(), 'file-at-'))
    await runGit(repo, ['init', '-q'])
    mkdirSync(path.join(repo, 'src'))
    writeFileSync(path.join(repo, 'src', 'a.py'), 'x = 1\n')
    await runGit(repo, ['add', '.'])
    await runGit(repo, ['-c', 'user.name=t', '-c', 'user.email=t@t', 'commit', '-q', '-m', 'init'])
    head = (await runGit(repo, ['rev-parse', 'HEAD'])).trim()
    writeFileSync(path.join(repo, 'src', 'a.py'), 'x = 2\n')
    writeFileSync(path.join(repo, 'src', 'b.py'), 'y = 1\n')
  })

  afterAll(() => {
    rmSync(repo, { recursive: true, force: true })
  })

  it('取提交里的内容，不是工作区里改过的', async () => {
    expect(await fileAtRef(repo, head, 'src/a.py')).toBe('x = 1\n')
  })

  it('提交里没有这个文件是 null', async () => {
    expect(await fileAtRef(repo, head, 'src/b.py')).toBeNull()
  })

  it('提交不存在时抛错', async () => {
    await expect(fileAtRef(repo, '0123456789abcdef0123456789abcdef01234567', 'src/a.py')).rejects.toThrow()
  })
})