import { Context } from '@deepseek-ai/cordis'
import type { Agent, Inbox, InboxState } from '@deepseek-ai/dsh-agent'
import { createUserMessage } from '@deepseek-ai/dsh-llm'
import { SessionId } from '@deepseek-ai/dsh-session'
import { afterEach, describe, expect, it } from 'vitest'
import { SessionControlController } from '../src/control.ts'
import type { SessionControlFrame } from '../src/types.ts'
import {
  mountAgentLoopTestDependencies,
  mountAgentLoopTestHarness,
} from '@deepseek-ai/dsh-agent-loop-testkit'

const ownedContexts = new Set<Context>()
afterEach(async () => {
  await Promise.all([...ownedContexts].map(ctx => ctx.fiber.dispose()))
  ownedContexts.clear()
})

async function harness(): Promise<{
  ctx: Context
  control: SessionControlController
  agent: Agent
  inbox: Inbox
}> {
  const ctx = new Context()
  ownedContexts.add(ctx)
  await mountAgentLoopTestDependencies(ctx)
  const loop = await mountAgentLoopTestHarness(ctx)
  const agent = await loop.create(SessionId('queue-session'))
  return { ctx, control: new SessionControlController(ctx), agent, inbox: agent.inbox }
}

function message(text: string, source: 'user' | 'plugin' = 'user') {
  return createUserMessage({
    content: [{ type: 'text', text }],
    source: source === 'user' ? { kind: 'user' } : { kind: 'plugin', plugin: 'fixture' },
  })
}

describe('Session control Inbox projection', () => {
  /** Consume frames until the next durable Inbox value. */
  async function nextInboxFrame(
    iterator: AsyncIterator<SessionControlFrame>,
  ): Promise<Extract<SessionControlFrame, { type: 'projection' }>> {
    for (;;) {
      const next = await iterator.next()
      if (next.done) throw new Error('stream ended before an Inbox value')
      if (next.value.type === 'projection' && next.value.key === 'inbox') return next.value
    }
  }

  it('projects both pending lists in baselines and live replacement frames', async () => {
    const { control, inbox } = await harness()
    const queued = message('queued')
    const steering = message('steering')
    const context = message('context', 'plugin')
    inbox.append('next-turn', queued)
    inbox.append('next-step', steering)
    inbox.append('next-step', context)

    const abort = new AbortController()
    const iterator = control.control(abort.signal)[Symbol.asyncIterator]()
    const opened = await iterator.next()
    expect(opened.value).toMatchObject({
      type: 'baseline',
      value: {
        projections: {
          'queue-session': { values: { inbox: {
            'next-turn': [queued], 'next-step': [steering, context],
          } } },
        },
      },
    })

    const replacement = message('replacement')
    inbox.append('next-turn', replacement)
    const replaced = await nextInboxFrame(iterator)
    expect(replaced.value).toMatchObject({ 'next-turn': [queued, replacement] })
    inbox.remove(steering.id)
    const removed = await nextInboxFrame(iterator)
    expect(removed.value).toMatchObject({ 'next-step': [context] })

    abort.abort()
    await iterator.next()
  })

  it('derives queue replacements from the completed projection regardless of registration order', async () => {
    const ctx = new Context()
    ownedContexts.add(ctx)
    await mountAgentLoopTestDependencies(ctx)
    const loop = await mountAgentLoopTestHarness(ctx)
    const control = new SessionControlController(ctx)
    const agent = await loop.create(SessionId('late-projection-queue'))
    const { inbox } = agent
    const abort = new AbortController()
    const iterator = control.control(abort.signal)[Symbol.asyncIterator]()
    await iterator.next()
    const pending = message('late projection')

    inbox.append('next-turn', pending)

    await expect(iterator.next()).resolves.toMatchObject({
      value: {
        type: 'projection',
        key: 'inbox',
        value: { 'next-turn': [{ id: pending.id }], 'next-step': [] },
      },
    })

    abort.abort()
    await iterator.next()
  })

  it('projects the prompt rpcId from a user-rpc source and omits it elsewhere', async () => {
    const { control, inbox } = await harness()
    const identified = createUserMessage({
      content: [{ type: 'text', text: 'browser prompt' }],
      source: { kind: 'user', rpcId: 'req-42' as never },
    })
    inbox.append('next-turn', identified)
    inbox.append('next-step', message('plain steering'))

    const abort = new AbortController()
    const iterator = control.control(abort.signal)[Symbol.asyncIterator]()
    const opened = await iterator.next()
    if (opened.done || opened.value.type !== 'baseline') throw new Error('missing baseline')
    const inboxValue = opened.value.value.projections['queue-session' as SessionId]?.values.inbox as unknown as InboxState
    expect(inboxValue['next-turn'][0]?.source).toMatchObject({ kind: 'user', rpcId: 'req-42' })
    expect(inboxValue['next-step'][0]?.source).toEqual({ kind: 'user' })

    abort.abort()
    await iterator.next()
  })

  it('publishes Inbox values for sessions without a live Agent', async () => {
    const { ctx, control } = await harness()
    const abort = new AbortController()
    const iterator = control.control(abort.signal)[Symbol.asyncIterator]()
    await iterator.next()
    const session = ctx.sessions.create(SessionId('unattached-inbox'))
    const pending = message('unattached')
    session.append('agent/inbox/spliced', {
      target: 'next-turn', start: 0, inserted: [pending],
    })
    expect(ctx.agents.get(session.id)).toBeUndefined()
    await expect(nextInboxFrame(iterator)).resolves.toMatchObject({
      sessionId: session.id, value: { 'next-turn': [pending], 'next-step': [] },
    })
    abort.abort()
    await iterator.next()
  })

  it('drops broadcasts after cancellation has ended its queue', async () => {
    const { control, inbox } = await harness()
    const abort = new AbortController()
    const iterator = control.control(abort.signal)[Symbol.asyncIterator]()
    await iterator.next()
    const waiting = iterator.next()
    await Promise.resolve()

    abort.abort()
    inbox.append('next-turn', message('late'))

    await expect(waiting).resolves.toMatchObject({ done: true })
  })

  it('ends active streams on context disposal after flushing buffered frames', async () => {
    const { ctx, control, inbox } = await harness()
    const iterator = control.control(new AbortController().signal)[Symbol.asyncIterator]()
    await iterator.next()
    const first = message('first')
    const second = message('second')
    inbox.append('next-turn', first)
    inbox.append('next-turn', second)

    const values: InboxState[] = []
    ownedContexts.delete(ctx)
    await ctx.fiber.dispose()
    for (;;) {
      const next = await iterator.next()
      if (next.done) break
      if (next.value.type === 'projection' && next.value.key === 'inbox') values.push(next.value.value as unknown as InboxState)
    }
    expect(values.map(value => value['next-turn'].map(item => item.id))).toEqual([[first.id], [first.id, second.id]])
  })
})