const assert = require('node:assert/strict')
const { spawn } = require('node:child_process')
const net = require('node:net')
const { test } = require('node:test')

const HOST = '127.0.0.1'
const TOKEN = 'server-smoke-token'

test('render server health, auth, and validation routes work', async (t) => {
  const port = await freePort()
  const server = spawn(process.execPath, ['server.js'], {
    cwd: __dirname,
    env: {
      ...process.env,
      HOST,
      PORT: String(port),
      RENDER_TOKEN: TOKEN,
      RENDER_MAX_BODY: '1mb',
      RENDER_RATE_MAX: '100',
      PUPPETEER_EXECUTABLE_PATH: '/not-used-by-smoke-test',
    },
    stdio: ['ignore', 'pipe', 'pipe'],
  })

  let output = ''
  server.stdout.on('data', (chunk) => {
    output += chunk.toString()
  })
  server.stderr.on('data', (chunk) => {
    output += chunk.toString()
  })

  t.after(async () => {
    if (server.exitCode === null) {
      server.kill('SIGTERM')
      await waitForExit(server)
    }
  })

  await waitForServer(server, port, () => output)

  const base = `http://${HOST}:${port}`

  const health = await fetch(`${base}/health`)
  assert.equal(health.status, 200)
  assert.deepEqual(await health.json(), { ok: true })

  const missingToken = await postRender(base, null, invalidRenderBody())
  assert.equal(missingToken.status, 401)
  assert.equal((await missingToken.json()).error, 'invalid render token')

  const badToken = await postRender(base, 'wrong-token', invalidRenderBody())
  assert.equal(badToken.status, 401)
  assert.equal((await badToken.json()).error, 'invalid render token')

  const invalidRender = await postRender(base, TOKEN, invalidRenderBody())
  assert.equal(invalidRender.status, 400)
  assert.match((await invalidRender.json()).error, /canvas must be/)

  const missingJobEvents = await fetch(`${base}/render/does-not-exist/events?token=bad`)
  assert.equal(missingJobEvents.status, 404)

  const missingJobFile = await fetch(`${base}/render/does-not-exist/file?token=bad`)
  assert.equal(missingJobFile.status, 404)

  const missingJobDelete = await fetch(`${base}/render/does-not-exist?token=bad`, { method: 'DELETE' })
  assert.equal(missingJobDelete.status, 404)
})

function invalidRenderBody() {
  return {
    scene: {
      canvas: { width: 0, height: 100 },
      duration: 1,
      fps: 30,
      layers: [],
      assets: [],
    },
    options: { fps: 30 },
  }
}

function postRender(base, token, body) {
  const headers = { 'Content-Type': 'application/json' }
  if (token) headers.Authorization = `Bearer ${token}`
  return fetch(`${base}/render`, {
    method: 'POST',
    headers,
    body: JSON.stringify(body),
  })
}

function freePort() {
  return new Promise((resolve, reject) => {
    const server = net.createServer()
    server.once('error', reject)
    server.listen(0, HOST, () => {
      const address = server.address()
      server.close(() => {
        if (!address || typeof address === 'string') reject(new Error('could not allocate test port'))
        else resolve(address.port)
      })
    })
  })
}

async function waitForServer(server, port, output) {
  const deadline = Date.now() + 5000
  let lastError = null

  while (Date.now() < deadline) {
    if (server.exitCode !== null) {
      throw new Error(`server exited early with code ${server.exitCode}\n${output()}`)
    }
    try {
      const res = await fetch(`http://${HOST}:${port}/health`)
      if (res.ok) return
    } catch (err) {
      lastError = err
    }
    await delay(50)
  }

  throw new Error(`server did not start: ${lastError?.message || 'timeout'}\n${output()}`)
}

function waitForExit(child) {
  return new Promise((resolve) => {
    child.once('exit', () => resolve())
    setTimeout(() => {
      if (child.exitCode === null) child.kill('SIGKILL')
      resolve()
    }, 1000).unref()
  })
}

function delay(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms))
}