// 后台调用（docs/design/15-background-calls.md）：外部工具的长调用转到后台，结束后把结果发给发起方
import http from 'node:http'
import type { AddressInfo } from 'node:net'
import pino from 'pino'
import { afterAll, beforeAll, describe, expect, it } from 'vitest'
import { z } from 'zod'
import { Client } from '@modelcontextprotocol/sdk/client/index.js'
import { StreamableHTTPClientTransport } from '@modelcontextprotocol/sdk/client/streamableHttp.js'
import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'
import { StreamableHTTPServerTransport } from '@modelcontextprotocol/sdk/server/streamableHttp.js'
import type { BackgroundCallDto, ProviderStatusDto, TeamDetailDto, TeamEvent, TeamMessage } from '@agent-server/shared'
import { createApp, type App } from '../src/app'
import { buildServer } from '../src/http/server'
import type { AgentProvider, RunContext } from '../src/providers/types'

type ToolCall = (tool: string, args?: Record<string, unknown>) => Promise<string>
type Script = (input: string, tool: ToolCall, collab: ToolCall) => Promise<string>

/** 外部服务的慢工具：等测试放行后才返回 */
const gates = new Map<string, () => void>()
const waitGate = (key: string) => new Promise<void>(r => gates.set(key, r))
const release = async (key: string) => {
  const r = await waitFor(() => gates.get(key))
  gates.delete(key)
  r()
}

class ScriptedProvider implements AgentProvider {
  readonly id = 'claude' as const
  scripts: Record<string, Script> = {}
  inputs: { bot: string; text: string; sessionId: string }[] = []
  hang = false
  async run(ctx: RunContext) {
    ctx.setProviderSessionId(`fake-${ctx.sessionId}`)
    const title = app.sessions.getRow(ctx.sessionId).title
    const bot = title.includes(' · ') ? title.split(' · ').at(-1)! : 'session'
    this.inputs.push({ bot, text: ctx.input.text, sessionId: ctx.sessionId })
    if (this.hang) await new Promise((_, reject) => ctx.signal.addEventListener('abort', () => reject(new Error('aborted'))))
    // 与真实引擎一样经 HTTP 连接网关（测试服务的端口与配置不同，替换主机和端口）
    const url = new URL(ctx.gateway.url)
    const client = new Client({ name: 'fake', version: '1' })
    await client.connect(new StreamableHTTPClientTransport(new URL(`${url.pathname}${url.search}`, base), { requestInit: { headers: { Authorization: `Bearer ${ctx.gateway.token}` } } }))
    const tool: ToolCall = async (name, args = {}) => {
      const r = await client.callTool({ name: `slowsvc__${name}`, arguments: args }, undefined, { timeout: 60_000 })
      return (r.content as { text: string }[])[0]!.text
    }
    const gctx = app.gatewayTokens.get(ctx.gateway.token)!
    const collab: ToolCall = async (name, args = {}) => {
      const t = gctx.extraTools!.find(x => x.name === name)!
      const r = await t.handler(t.schema.parse(args) as Record<string, unknown>, gctx)
      return String(r.content[0]?.text ?? '')
    }
    try {
      const reply = await (this.scripts[bot] ?? (async () => 'ok'))(ctx.input.text, tool, collab)
      ctx.emit('message.completed', { messageId: `m${this.inputs.length}`, text: reply })
    } finally {
      await client.close()
    }
    return { usage: { inputTokens: 1, outputTokens: 1, cacheReadTokens: 0, cacheWriteTokens: 0, costUsd: 0.001 } }
  }
  async status(): Promise<ProviderStatusDto> {
    return { id: 'claude', enabled: true, available: true, loggedIn: true, account: 'test', cliPath: '', version: 'x', models: ['m'], defaultModel: 'm', message: null }
  }
}

let app: App
let server: Awaited<ReturnType<typeof buildServer>>
let base: string
let upstream: http.Server
let apiKey: string
let botKey: string
let serverId: string
let adminCookie: Record<string, string>
const fake = new ScriptedProvider()
const auth = (key = apiKey) => ({ authorization: `Bearer ${key}` })

async function waitFor<T>(fn: () => T | undefined | false | null, ms = 6000): Promise<T> {
  const end = Date.now() + ms
  while (Date.now() < end) {
    const v = fn()
    if (v) return v
    await new Promise(r => setTimeout(r, 20))
  }
  throw new Error('timeout')
}

function startUpstream(): Promise<string> {
  upstream = http.createServer(async (req, res) => {
    const mcp = new McpServer({ name: 'slow', version: '1.0.0' })
    mcp.registerTool('export', { description: '导出（很慢）', inputSchema: { key: z.string() }, annotations: { readOnlyHint: true } }, async ({ key }) => {
      await waitGate(key)
      return { content: [{ type: 'text', text: key === 'big' ? `结果：${'数'.repeat(9000)}` : `导出完成：${key}` }] }
    })
    mcp.registerTool('quick', { description: '很快', inputSchema: {}, annotations: { readOnlyHint: true } }, async () => ({ content: [{ type: 'text', text: '马上好了' }] }))
    const t = new StreamableHTTPServerTransport({ sessionIdGenerator: undefined })
    res.on('close', () => { void t.close(); void mcp.close() })
    await mcp.connect(t)
    let body = ''
    req.on('data', c => (body += c))
    req.on('end', () => void t.handleRequest(req, res, body ? JSON.parse(body) : undefined))
  })
  return new Promise(r => upstream.listen(0, '127.0.0.1', () => r(`http://127.0.0.1:${(upstream.address() as AddressInfo).port}/mcp`)))
}

beforeAll(async () => {
  const log = pino({ level: 'silent' })
  app = createApp(log, { providers: { claude: fake } })
  server = await buildServer(app, { logger: log })
  base = await server.listen({ port: 0, host: '127.0.0.1' })
  const url = await startUpstream()
  serverId = app.mcpServers.create({
    name: 'slowsvc', title: '慢服务', description: '', transport: 'http', enabled: true, url, headers: [], command: '', args: [], env: [],
    allowNetwork: false, readPaths: [], writePaths: [],
  }).id
  await app.mcpServers.refresh(serverId)
  const builtin = app.profiles.getBuiltin()
  const { id: _id, version: _v, updatedAt: _u, builtin: _b, builtinKey: _k, ...input } = builtin
  const profile = app.profiles.create({ ...input, name: '带慢服务', isDefault: false, mcpServerIds: [serverId] })
  apiKey = app.apiKeys.create('平台A', { allowedProfileIds: [profile.id], defaultProfileId: profile.id }).key
  for (const [name, kind] of [['组长', 'lead'], ['导出员', 'worker']] as const) app.bots.create({ name, avatar: 'kl:bot:blue', kind, description: name, profileId: profile.id, enabled: true })
  botKey = app.botKeys.create('平台A', app.bots.list().map(b => b.id)).key
  app.settings.update({ backgroundCalls: { autoAfterSec: 1 } })
  const login = await server.inject({ method: 'POST', url: '/admin/v1/auth/login', payload: { password: 'test-password' } })
  adminCookie = { [login.cookies[0]!.name]: login.cookies[0]!.value }
})
afterAll(async () => {
  app.backgroundCalls.stop()
  await app.mcpUpstream.closeAll()
  await server.close()
  upstream.close()
})

const newSession = async () => (await server.inject({ method: 'POST', url: '/v1/sessions', headers: auth(), payload: {} })).json().id as string
const calls = async (sid: string) => (await server.inject({ method: 'GET', url: `/v1/sessions/${sid}/background-calls`, headers: auth() })).json() as BackgroundCallDto[]
const send = (sid: string, text: string) => server.inject({ method: 'POST', url: `/v1/sessions/${sid}/messages`, headers: auth(), payload: { text } })
const idle = (sid: string) => !app.runs.activeForSession(sid)

describe('会话中的后台调用', () => {
  it('很快返回的调用照常返回；超过时限的转为后台，完成后把结果作为新消息发到会话', async () => {
    const sid = await newSession()
    let reply = ''
    fake.scripts.session = async (input, tool) => {
      if (input.startsWith('【后台调用')) return '收到结果'
      reply = await tool(input.includes('快') ? 'quick' : 'export', input.includes('快') ? {} : { key: 'q3' })
      return reply
    }
    await send(sid, '快一点')
    await waitFor(() => idle(sid) && reply)
    expect(reply).toBe('马上好了')
    expect(await calls(sid)).toHaveLength(0)

    reply = ''
    await send(sid, '导出 Q3')
    await waitFor(() => idle(sid) && reply)
    expect(reply).toMatch(/已转为后台执行（后台调用 bg_/)
    const [running] = await calls(sid)
    expect(running).toMatchObject({ status: 'running', serverTitle: '慢服务', tool: 'export', args: { key: 'q3' } })

    const before = fake.inputs.length
    await release('q3')
    const delivered = await waitFor(() => fake.inputs.slice(before).find(i => i.sessionId === sid))
    expect(delivered.text).toMatch(/^【后台调用完成】慢服务 · export（bg_.+，耗时 \d+ 分钟）/)
    expect(delivered.text).toContain('结果：\n导出完成：q3')
    await waitFor(() => idle(sid))
    expect((await calls(sid))[0]).toMatchObject({ status: 'completed', result: '导出完成：q3', delivered: true })
  })

  it('会话正在执行时，等这一轮结束再通知；较长的结果保存为文件', async () => {
    const sid = await newSession()
    fake.scripts.session = async (input, tool) => (input.startsWith('【后台调用') || input === '别的事' ? 'ok' : tool('export', { key: 'big' }))
    await send(sid, '导出大文件')
    await waitFor(() => idle(sid) && app.backgroundCalls.list({ sessionId: sid })[0])
    fake.hang = true
    await send(sid, '别的事')
    await waitFor(() => !idle(sid))
    await release('big')
    await waitFor(() => app.backgroundCalls.list({ sessionId: sid })[0]?.status === 'completed')
    const before = fake.inputs.length
    await new Promise(r => setTimeout(r, 100))
    expect(fake.inputs.length).toBe(before)
    expect(app.backgroundCalls.list({ sessionId: sid })[0]!.delivered).toBe(false)
    fake.hang = false
    app.runs.interrupt(app.runs.activeForSession(sid)!.runId, sid)
    const delivered = await waitFor(() => fake.inputs.slice(before).find(i => i.text.startsWith('【后台调用完成】')))
    expect(delivered.text).toMatch(/完整结果已保存到 \.agent\/mcp\/background-export-bg_.+\.txt/)
    await waitFor(() => idle(sid))
  })

  it('标记为总是后台执行的工具立即转到后台；平台可以取消，AI 收到取消的消息', async () => {
    const r = await server.inject({ method: 'PUT', url: `/admin/v1/mcp/servers/${serverId}/tools/export/background`, cookies: adminCookie, payload: { background: true } })
    expect(r.json().tools.find((t: { name: string }) => t.name === 'export').background).toBe(true)
    const sid = await newSession()
    let reply = ''
    const t0 = Date.now()
    fake.scripts.session = async (input, tool) => (input.startsWith('【后台调用') ? 'ok' : (reply = await tool('export', { key: 'never' })))
    await send(sid, '导出')
    await waitFor(() => idle(sid) && reply)
    expect(reply).toContain('已转为后台执行')
    expect(Date.now() - t0).toBeLessThan(900)
    const [call] = await calls(sid)
    // 其他平台不能取消
    const other = app.apiKeys.create('平台B', { allowedProfileIds: [app.profiles.getBuiltin().id], defaultProfileId: app.profiles.getBuiltin().id }).key
    expect((await server.inject({ method: 'POST', url: `/v1/background-calls/${call!.id}/cancel`, headers: auth(other) })).statusCode).toBe(404)
    const before = fake.inputs.length
    const cancelled = await server.inject({ method: 'POST', url: `/v1/background-calls/${call!.id}/cancel`, headers: auth() })
    expect(cancelled.json()).toMatchObject({ status: 'cancelled', error: '成员取消了这次调用' })
    const delivered = await waitFor(() => fake.inputs.slice(before).find(i => i.sessionId === sid))
    expect(delivered.text).toMatch(/^【后台调用已取消】/)
    expect((await server.inject({ method: 'POST', url: `/v1/background-calls/${call!.id}/cancel`, headers: auth() })).statusCode).toBe(409)
    await waitFor(() => idle(sid))
    gates.delete('never')
    await server.inject({ method: 'PUT', url: `/admin/v1/mcp/servers/${serverId}/tools/export/background`, cookies: adminCookie, payload: { background: false } })
  })
})

describe('工作组中的后台调用', () => {
  it('组员在子任务中发起的调用转到后台时，子任务等待；结果到达后组员继续并汇报给组长', async () => {
    const [lead, worker] = [app.bots.list().find(b => b.kind === 'lead')!, app.bots.list().find(b => b.kind === 'worker')!]
    const team = (await server.inject({ method: 'POST', url: '/bot/v1/teams', headers: auth(botKey), payload: { human: { id: 'u', name: '张三' }, leadBotId: lead.id, workerBotIds: [worker.id] } })).json() as TeamDetailDto
    fake.scripts['组长'] = async (input, _tool, collab) => {
      if (input.includes('子任务 #') && input.includes('已完成')) {
        await collab('job_complete', { summary: '导出好了' })
        return '完成'
      }
      if (input.includes('导出')) {
        await collab('job_start', { title: '导出', plan: '' })
        await collab('task_create', { bot_id: worker.id, title: '导出数据', instructions: '调用 export' })
      }
      return '安排了'
    }
    fake.scripts['导出员'] = async (input, tool, collab) => {
      if (input.includes('继续完成这个子任务')) {
        expect(input).toContain('【后台调用完成】慢服务 · export')
        await collab('task_complete', { result: input.includes('导出完成：team') ? '已导出' : '?' })
        return '汇报了'
      }
      return tool('export', { key: 'team' })
    }
    await server.inject({ method: 'POST', url: `/bot/v1/teams/${team.id}/messages`, headers: auth(botKey), payload: { text: '帮我导出' } })
    const task = await waitFor(() => app.teams.jobs.tasks(team.id, { status: ['background'] })[0])
    expect(task.title).toBe('导出数据')
    const list = (await server.inject({ method: 'GET', url: `/bot/v1/teams/${team.id}/background-calls`, headers: auth(botKey) })).json() as BackgroundCallDto[]
    expect(list[0]).toMatchObject({ status: 'running', teamId: team.id, botId: worker.id, taskId: task.id })
    // 组长没有被唤醒去处理"已转为后台"的回复
    const messages = () => app.teams.events.list(team.id, 0, 5000, ['message.created']).map(e => (e as TeamEvent & { type: 'message.created' }).payload as TeamMessage)
    expect(messages().some(m => m.card?.kind === 'task' && m.card.event === 'completed')).toBe(false)

    await release('team')
    const job = await waitFor(() => app.teams.jobs.jobs(team.id)[0]?.status === 'completed' && app.teams.jobs.jobs(team.id)[0])
    expect(job.summary).toBe('导出好了')
    expect(app.teams.jobs.tasks(team.id)[0]).toMatchObject({ status: 'completed', result: '已导出', followUp: null })
    const overview = (await server.inject({ method: 'GET', url: '/admin/v1/background-calls', cookies: adminCookie })).json()
    expect(overview.find((x: { id: string }) => x.id === list[0]!.id)).toMatchObject({ status: 'completed', targetTitle: team.title })
  })
})