import { promises as fsp } from 'node:fs'
import * as os from 'node:os'
import * as path from 'node:path'
import { afterEach, beforeEach, describe, expect, it } from 'vitest'
import { ClaudeCancelledError, ClaudeError, ClaudeTimeoutError, runClaudeLines } from './spawnClaude'

let dir: string

beforeEach(async () => {
  dir = await fsp.mkdtemp(path.join(os.tmpdir(), 'fake-claude-'))
})

afterEach(async () => {
  await fsp.rm(dir, { recursive: true, force: true })
})

/** 假的 claude：一段 sh 脚本 */
async function fakeBin(script: string): Promise<string> {
  const bin = path.join(dir, 'claude')
  await fsp.writeFile(bin, `#!/bin/sh\n${script}\n`, { mode: 0o755 })
  return bin
}

describe('跑 claude、逐行交出 stdout', () => {
  it('每出来完整的一行交一行，最后没带换行的那段结束时交出；参数原样传、在 cwd 里跑', async () => {
    const bin = await fakeBin('printf \'{"a":1}\\n{"b":\'; sleep 0.1; printf \'2}\\n\'; pwd; printf "%s|" "$@"')
    const lines: string[] = []
    await runClaudeLines({ bin, args: ['-p', '带 空格 的问题'], cwd: dir, onLine: item => lines.push(item) })
    expect(lines).toEqual(['{"a":1}', '{"b":2}', await fsp.realpath(dir), '-p|带 空格 的问题|'])
  })

  it('给了 input 就写进 stdin 再关上（stream-json 的消息）；不给时 stdin 是空的，读 stdin 的也不会卡住', async () => {
    const bin = await fakeBin('cat; echo end')
    const withInput: string[] = []
    await runClaudeLines({ bin, args: [], cwd: dir, input: '{"type":"user"}\n', onLine: item => withInput.push(item) })
    expect(withInput).toEqual(['{"type":"user"}', 'end'])
    const without: string[] = []
    await runClaudeLines({ bin, args: [], cwd: dir, timeoutMs: 2000, onLine: item => without.push(item) })
    expect(without).toEqual(['end'])
  })

  it('退出码非零：带上 stderr 的原话', async () => {
    const bin = await fakeBin('echo "No conversation found with session ID: x" >&2; exit 1')
    const error = await runClaudeLines({ bin, args: [], cwd: dir, onLine: () => {} }).catch((err: unknown) => err)
    expect(error).toBeInstanceOf(ClaudeError)
    expect((error as ClaudeError).message).toBe('Claude 退出码非零 (1): No conversation found with session ID: x')
  })

  it('叫停：马上结束进程，报 ClaudeCancelledError；已经叫停的不再启动', async () => {
    const marker = path.join(dir, 'still-running')
    const bin = await fakeBin(`echo started; sleep 2; touch "${marker}"`)
    const controller = new AbortController()
    const started = Date.now()
    const run = runClaudeLines({ bin, args: [], cwd: dir, signal: controller.signal, onLine: () => controller.abort() })
    await expect(run).rejects.toBeInstanceOf(ClaudeCancelledError)
    expect(Date.now() - started).toBeLessThan(1500)
    await new Promise(resolve => setTimeout(resolve, 2500))
    await expect(fsp.access(marker)).rejects.toThrow()
    await expect(runClaudeLines({ bin, args: [], cwd: dir, signal: controller.signal, onLine: () => {} })).rejects.toBeInstanceOf(ClaudeCancelledError)
  }, 10_000)

  it('超时：结束进程，报 ClaudeTimeoutError', async () => {
    const bin = await fakeBin('sleep 5')
    await expect(runClaudeLines({ bin, args: [], cwd: dir, timeoutMs: 200, onLine: () => {} })).rejects.toBeInstanceOf(ClaudeTimeoutError)
  })
})