import test from 'node:test'
import assert from 'node:assert/strict'
import { EventEmitter } from 'node:events'
import { PassThrough } from 'node:stream'
import { mkdtempSync, writeFileSync, readFileSync, existsSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import ts from 'typescript'
import { createYue2Host, validateYue2Request } from '../scripts/yue2-host.mjs'
import { createYueGpHost, validateYueGpRequest } from '../scripts/yuegp-host.mjs'

const request = { id: 'test-song-123456', tags: 'pop, warm vocals', lyrics: '[Verse 1]\nA quiet morning, a new day', seed: 0 }

test('YuE2 defaults are 60 seconds and keep Yue lyric validation', () => {
  assert.deepEqual(validateYue2Request(request), { ...request, duration: 60 })
  assert.throws(() => validateYue2Request({ ...request, lyrics: '[Verse]\nA\n[Chorus]\nB' }))
  assert.throws(() => validateYue2Request({ ...request, duration: 20 }))
  assert.throws(() => validateYue2Request({ ...request, id: '../escape' }))
})

test('yue still validates as YuEGP and stays separate from yue2', () => {
  assert.equal(validateYueGpRequest(request).profile, 1)
  assert.equal(validateYue2Request(request).duration, 60)
  assert.notEqual(createYueGpHost.name, createYue2Host.name)
})

function fixture() {
  const root = mkdtempSync(join(tmpdir(), 'aigen-yue2-'))
  const python = join(root, 'python.exe')
  writeFileSync(python, '')
  writeFileSync(join(root, 'aigen-ready.json'), JSON.stringify({ model: 'm-a-p/YuE2-3B', vae: 'm-a-p/YuE2-Vae' }))
  const child = new EventEmitter()
  child.stdout = new PassThrough(); child.stderr = new PassThrough()
  child.kill = () => { setImmediate(() => child.emit('close', 1)); return true }
  const calls = []
  const dataDir = join(root, 'jobs')
  const host = createYue2Host({ root, python, dataDir, prepare: async () => {}, leaseValid: () => true,
    spawnProcess: (...args) => { calls.push(args); return child } })
  return { host, child, calls, root, dataDir }
}

test('host launches yue2-worker, preserves seed 0 and lyrics, and deduplicates POST retries', async () => {
  const f = fixture()
  await f.host.start(request, 'lease')
  await f.host.start(request, 'lease')
  assert.equal(f.calls.length, 1)
  const [, args, opts] = f.calls[0]
  assert.ok(String(args[1]).endsWith('yue2-worker.py'))
  assert.equal(opts.windowsHide, true)
  assert.equal(opts.shell, false)
  const posted = JSON.parse(readFileSync(join(f.dataDir, request.id, 'request.json')))
  assert.equal(posted.seed, 0)
  assert.equal(posted.lyrics, request.lyrics)
  assert.equal(posted.model, 'm-a-p/YuE2-3B')
  assert.equal(posted.vae, 'm-a-p/YuE2-Vae')
  await assert.rejects(f.host.start({ ...request, id: 'second-song-12345' }, 'lease'), /already running/)
  await f.host.cancel(request.id)
  assert.equal(f.host.busy(), false)
  assert.equal(f.host.read(request.id).status, 'cancelled')
})

test('OOM stays on yue2 with no engine switch', async () => {
  const f = fixture()
  await f.host.start(request, 'lease')
  f.child.stdout.write('AIGEN_EVENT {"stage":"error","error":"CUDA out of memory"}\n')
  f.child.emit('close', 1)
  assert.match(f.host.read(request.id).error, /out of memory/)
  assert.equal(f.calls.length, 1)
})

test('music workflow refuses yue and yue2 while ACE graphs still build', () => {
  const source = readFileSync(new URL('../server/utils/musicWorkflow.ts', import.meta.url), 'utf8')
  const code = ts.transpileModule(source, { compilerOptions: { target: ts.ScriptTarget.ES2022, module: ts.ModuleKind.CommonJS } }).outputText
  const exports = {}
  new Function('require', 'exports', 'useRuntimeConfig', code)(id => {
    if (id.endsWith('.json')) return { default: JSON.parse(readFileSync(new URL(`../server/assets/${id.split('/').pop()}`, import.meta.url))) }
    if (id === '~/utils/music') return { parseMusicBpm: () => 120 }
    throw new Error(id)
  }, exports, () => ({}))
  const params = { tags: 'pop', lyrics: '[Verse]\nhello', duration: 60, steps: 8, seed: 0, cfg: 1, lyricsStrength: 0.9 }
  assert.throws(() => exports.buildMusicWorkflow({ ...params, engine: 'yue' }), /standalone YuEGP/)
  assert.throws(() => exports.buildMusicWorkflow({ ...params, engine: 'yue2' }), /standalone YuE2/)
  for (const engine of ['ace-step', 'ace-step-1.5']) {
    const graph = exports.buildMusicWorkflow({ ...params, engine })
    assert.ok(Object.values(graph).some(n => n.class_type === 'KSampler' && n.inputs.seed === 0))
  }
  assert.equal(existsSync(new URL('../server/assets/workflow_yue.json', import.meta.url)), false)
})

test('musicChain routes yue2 to startYue2Job and leaves yue on YuEGP', () => {
  const source = readFileSync(new URL('../server/utils/musicChain.ts', import.meta.url), 'utf8')
  assert.match(source, /engine === 'yue'\) return startYueGpJob/)
  assert.match(source, /engine === 'yue2'\) return startYue2Job/)
  assert.match(source, /from '\.\/yue2'/)
})