import { execFileSync } from 'node:child_process'
import { mkdtempSync, rmSync, writeFileSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { afterAll, describe, expect, it } from 'vitest'

const script = join(import.meta.dirname, 'lint-commit-msg.mjs')
const dir = mkdtempSync(join(tmpdir(), 'commit-lint-'))
afterAll(() => rmSync(dir, { recursive: true, force: true }))

function run(message) {
  const msgFile = join(dir, 'msg')
  writeFileSync(msgFile, message)
  execFileSync(process.execPath, [script, msgFile])
}

describe('lint-commit-msg.mjs', () => {
  it('accepts Conventional Commit headers', () => {
    run('feat: add a thing\n')
    run('fix(popup)!: change the close behavior\n')
  })

  it('accepts messages git writes for us', () => {
    run("Merge branch 'claude/thing'\n")
    run('fixup! feat: add a thing\n')
  })

  it('rejects a non-conventional header', () => {
    expect(() => run('added some stuff\n')).toThrow()
  })

  it('ignores comments and everything below the scissors line', () => {
    run(
      '# please enter the commit message\nfix: close the leak\n\n' +
        '# ------------------------ >8 ------------------------\nnot a header, just the diff\n',
    )
  })
})