import { test } from 'node:test'
import assert from 'node:assert/strict'
import { mkdtemp, mkdir, writeFile, readFile, readdir, rm } from 'node:fs/promises'
import os from 'node:os'
import path from 'node:path'
import { fetchPluginRelease } from './fetch-plugin-release.mjs'

function upstream({ failMain = false } = {}) {
  return async url => {
    if (url.includes('/releases/tags/')) return Response.json({ html_url: 'https://github.com/example/plugin/releases/tag/2.0.0', assets: [
      { name: 'manifest.json', browser_download_url: 'https://assets.test/manifest.json' },
      { name: 'main.js', browser_download_url: 'https://assets.test/main.js' },
    ] })
    if (url.endsWith('/manifest.json')) return Response.json({ id: 'plugin', version: '2.0.0' })
    if (url.endsWith('/main.js')) return new Response(failMain ? 'unavailable' : 'new release code', { status: failMain ? 503 : 200 })
    if (url.endsWith('/LICENSE')) return new Response('Upstream license')
    throw new Error(`Unexpected fetch: ${url}`)
  }
}

test('replacing a fixture drops optional files absent from the new upstream release', async () => {
  const root = await mkdtemp(path.join(os.tmpdir(), 'reams-plugin-release-'))
  try {
    const directory = path.join(root, 'plugin')
    await mkdir(directory)
    await writeFile(path.join(directory, 'styles.css'), 'obsolete stylesheet')
    await fetchPluginRelease('example/plugin', '2.0.0', directory, upstream())
    assert.equal(await readFile(path.join(directory, 'main.js'), 'utf8'), 'new release code')
    assert.equal(await readFile(path.join(directory, 'LICENSE'), 'utf8'), 'Upstream license')
    assert.equal((await readdir(directory)).includes('styles.css'), false)
    assert.deepEqual(await readdir(root), ['plugin'])
  } finally { await rm(root, { recursive: true, force: true }) }
})

test('a partial download failure leaves the previous fixture entirely intact', async () => {
  const root = await mkdtemp(path.join(os.tmpdir(), 'reams-plugin-release-'))
  try {
    const directory = path.join(root, 'plugin')
    await mkdir(directory)
    const previous = { 'manifest.json': '{"id":"plugin","version":"1.0.0"}', 'main.js': 'previous code', 'styles.css': 'previous styles' }
    for (const [file, contents] of Object.entries(previous)) await writeFile(path.join(directory, file), contents)
    await assert.rejects(fetchPluginRelease('example/plugin', '2.0.0', directory, upstream({ failMain: true })), /main.js: HTTP 503/)
    for (const [file, contents] of Object.entries(previous)) assert.equal(await readFile(path.join(directory, file), 'utf8'), contents)
    assert.deepEqual(await readdir(root), ['plugin'])
  } finally { await rm(root, { recursive: true, force: true }) }
})