import assert from 'node:assert/strict'
import { once } from 'node:events'
import { mkdtemp, mkdir, writeFile, rm } from 'node:fs/promises'
import { createServer } from 'node:http'
import { createRequire } from 'node:module'
import { tmpdir } from 'node:os'
import { join, resolve } from 'node:path'
import { build } from 'esbuild'
const piCli = process.argv[2] && resolve(process.argv[2])
assert.ok(piCli, 'Pass the installed Pi CLI entrypoint')
const scratch = await mkdtemp(join(tmpdir(), 'orca-pi-provider-'))
const requests = []
const server = createServer(async (req, res) => {
  let body = ''
  for await (const part of req) {
    body += part
  }
  requests.push(JSON.parse(body))
  res.writeHead(200, { 'content-type': 'text/event-stream' })
  for (const chunk of [
    {
      id: 'proof',
      object: 'chat.completion.chunk',
      choices: [
        {
          index: 0,
          delta: { role: 'assistant', content: 'fixture-generated-commit' },
          finish_reason: null
        }
      ]
    },
    {
      id: 'proof',
      object: 'chat.completion.chunk',
      choices: [{ index: 0, delta: {}, finish_reason: 'stop' }],
      usage: { prompt_tokens: 1, completion_tokens: 1, total_tokens: 2 }
    }
  ]) {
    res.write(`data: ${JSON.stringify(chunk)}\n\n`)
  }
  res.end('data: [DONE]\n\n')
})
try {
  const bundle = join(scratch, 'orca.cjs')
  await build({
    stdin: {
      contents:
        "export {planCommitMessageGeneration} from './src/shared/commit-message-plan'; export {runProcess} from './src/shared/child-process/run-process';",
      resolveDir: process.cwd()
    },
    bundle: true,
    platform: 'node',
    format: 'cjs',
    outfile: bundle,
    packages: 'external'
  })
  const { planCommitMessageGeneration, runProcess } = createRequire(import.meta.url)(bundle)
  server.listen(0, '127.0.0.1')
  await once(server, 'listening')
  const dir = join(scratch, 'agent')
  await mkdir(join(dir, 'extensions'), { recursive: true })
  await writeFile(
    join(dir, 'extensions', 'provider.ts'),
    `export default function(pi){pi.registerProvider('orca-proof',{name:'Proof',baseUrl:'http://127.0.0.1:${server.address().port}/v1',apiKey:'fixture-only',api:'openai-completions',models:[{id:'local',name:'Proof',reasoning:false,input:['text'],cost:{input:0,output:0,cacheRead:0,cacheWrite:0},contextWindow:8192,maxTokens:256}]})}`
  )
  await writeFile(
    join(dir, 'settings.json'),
    JSON.stringify({ defaultProvider: 'orca-proof', defaultModel: 'local' })
  )
  const planned = planCommitMessageGeneration(
    { agentId: 'pi', model: 'orca-proof/local' },
    'Generate one short commit message.'
  )
  assert.equal(planned.ok, true)
  const fixedArgs = planned.plan.args
  assert.ok(!fixedArgs.includes('--no-extensions'))
  const variants = [
    ['baseline', [...fixedArgs, '--no-extensions']],
    ['extensions-enabled', fixedArgs]
  ]
  const results = []
  for (const [variant, args] of variants) {
    const n = requests.length
    const result = await runProcess({
      program: process.execPath,
      args: [piCli, ...args],
      cwd: scratch,
      env: {
        PATH: process.env.PATH,
        SystemRoot: process.env.SystemRoot,
        WINDIR: process.env.WINDIR,
        HOME: scratch,
        USERPROFILE: scratch,
        ORCA_BACKGROUND_LAUNCH: '1',
        PI_CODING_AGENT_DIR: dir
      },
      input: planned.plan.stdinPayload,
      timeoutMs: 20000
    })
    results.push({
      variant,
      args,
      code: result.code,
      stdout: result.stdout,
      stderr: result.stderr,
      requests: requests.length - n
    })
  }
  assert.equal(results[0].requests, 0)
  assert.notEqual(results[0].code, 0)
  assert.equal(results[1].code, 0, results[1].stderr)
  assert.match(results[1].stdout, /fixture-generated-commit/)
  assert.equal(results[1].requests, 1)
  console.log(
    JSON.stringify(
      {
        scope:
          'Actual Pi CLI and production command planner; isolated extension provider with local OpenAI-compatible fixture.',
        platform: process.platform,
        results
      },
      null,
      2
    )
  )
} finally {
  server.closeAllConnections()
  server.close()
  await rm(scratch, { recursive: true, force: true })
}