import { Context } from '@deepseek-ai/cordis'
import AgentRegistry from '@deepseek-ai/dsh-agent'
import type { Agent } from '@deepseek-ai/dsh-agent'
import { createUserMessage } from '@deepseek-ai/dsh-llm'
import SessionStore, { SessionId } from '@deepseek-ai/dsh-session'
import type { SessionEvent, SessionHeader } from '@deepseek-ai/dsh-session'
import { describe, expect, it, vi } from 'vitest'
import SessionController from '../src/index.ts'
import { createSessionTestController } from './test-remote.ts'

const defaults = {
  defaultModelSelection: () => ({ provider: 'fixture', model: 'fixture-model' }),
  cwd: '/tmp',
}

describe('SessionController facade', () => {
  it('does not require the Tools service', () => {
    expect(SessionController.inject).not.toContain('tools')
  })

  it('owns Host service methods and publishes Agent lifecycle projections', async () => {
    const ctx = new Context()
    await ctx.plugin(SessionStore)
    await ctx.plugin(AgentRegistry)
    const sessionId = SessionId('controller-session')
    const header: SessionHeader = {
      version: 0,
      id: sessionId,
      createdAt: 1,
      cwd: '/workspace',
    }
    const events: SessionEvent[] = []
    const inspect = vi.fn(() => Promise.resolve({ meta: header, events }))
    ctx.provide('sessionPersistence', {
      list: () => Promise.resolve([header]),
      inspect,
    } as never)
    const controller = createSessionTestController(ctx, defaults)
    const status = vi.fn()
    const failure = vi.fn()
    const activity = vi.fn()
    ctx.on('api-session/status', status)
    ctx.on('api-session/error', failure)
    ctx.on('api-session/activity', activity)

    await expect(controller.inspect(sessionId)).resolves.toEqual({ meta: header, events })
    expect(inspect).toHaveBeenCalledOnce()

    const session = ctx.sessions.create(sessionId, { meta: header })
    const agent = {
      id: sessionId,
      session,
      status: 'idle',
      ctx,
    } as Agent
    ctx.agents.register(agent)

    await expect(controller.resolveAgent(sessionId)).resolves.toEqual({ agent })
    await expect(controller.inspect(sessionId)).resolves.toEqual({ meta: header, events })
    expect(inspect).toHaveBeenCalledOnce()
    ctx.emit('agent/status', { agent, status: 'running' })
    ctx.emit('agent/error', { agent, turn: 1, step: 0, error: new Error('fixture failure') })
    session.append('user/message', createUserMessage({
      content: [{ type: 'text', text: 'hello' }],
      source: { kind: 'user' },
    }), { surfaceOp: 'append' })
    expect(status).toHaveBeenCalledWith(sessionId, true)
    expect(failure).toHaveBeenCalledWith(sessionId, expect.stringContaining('fixture failure'))
    expect(activity).toHaveBeenCalledWith(sessionId, expect.any(Number))

    const abort = new AbortController()
    const iterator = controller.follow({
      address: { kind: 'session', sessionId },
    }, abort.signal)[Symbol.asyncIterator]()
    await expect(iterator.next()).resolves.toMatchObject({
      done: false,
      value: { type: 'opened', cursor: 0 },
    })
    abort.abort()
    await expect(iterator.next()).resolves.toEqual({ done: true, value: undefined })
  })
})