/**
 * ui-model browser half on a real cordis Context with fake command/slots/
 * connection faces and real session scopes: the plugin mounts ModelService
 * as `models`, the /model contribution and the conversation.input.model
 * seat both register, and BOTH entries resolve the SAME per-session
 * directory through the service — a selection submitted through the seat's
 * inject face is the current the popup's next options pass marks active
 * (and the reverse), the one-shared-state contract of the dual entry.
 * Scope disposal drops the directory (HMR safety).
 */
import { Context } from 'cordis'
import { describe, expect, it } from 'vitest'
import { createScope } from '@deepseek-ai/dsh-client-runtime/client'
import type { SessionId } from '@deepseek-ai/dsh-client-runtime/client'
import { LocaleService } from '@deepseek-ai/dsh-client-locale/client'
import type { ModelTarget } from '@deepseek-ai/dsh-client-connection/client'
import type { CommandContribution, SelectOption } from '@deepseek-ai/dsh-client-ui-command/client'
import type { ModelSelectInjected } from '../src/client/slots.ts'
import { apply, inject } from '../src/client/index.ts'

const sid = (k: string): SessionId => k as SessionId

const GROUPS = [{
  id: 'deepseek-official',
  name: 'DeepSeek',
  models: [
    {
      id: 'deepseek-v4-flash',
      name: 'DeepSeek-V4-Flash',
      reasoning: {
        efforts: [
          { id: 'off', name: 'Off' },
          { id: 'high', name: 'High' },
          { id: 'max', name: 'Max' },
        ],
        defaultEffort: 'high',
      },
    },
    {
      id: 'deepseek-v4-pro',
      name: 'DeepSeek-V4-Pro',
      reasoning: {
        efforts: [
          { id: 'off', name: 'Off' },
          { id: 'high', name: 'High' },
          { id: 'max', name: 'Max' },
        ],
        defaultEffort: 'high',
      },
    },
  ],
}]

/** Boot the plugin over fake faces + a stateful fake host (current moves on selectModel). */
async function bench() {
  const ctx = new Context()
  let current: ModelTarget = { provider: 'deepseek-official', model: 'deepseek-v4-flash' }
  const calls = { models: 0, select: 0 }
  ctx.provide('connection', { api: { sessions: {
    models: () => {
      calls.models += 1
      return Promise.resolve({ result: { ok: true as const, value: { current, groups: GROUPS, failures: [] } } })
    },
    selectModel: (payload: { provider: string; model: string; reasoningEffort?: string }) => {
      calls.select += 1
      current = {
        provider: payload.provider,
        model: payload.model,
        ...payload.reasoningEffort === undefined
          ? {}
          : { reasoningEffort: payload.reasoningEffort },
      }
      return Promise.resolve({ result: { ok: true as const, value: { selected: current } } })
    },
  } } })
  let contribution: CommandContribution | undefined
  ctx.provide('command', {
    register(c: CommandContribution) {
      contribution = c
      return () => { contribution = undefined }
    },
  })
  const seats = new Map<string, {
    inject: ((sessionId: SessionId) => ModelSelectInjected) | undefined
    locale: string | undefined
  }>()
  ctx.provide('slots', {
    register(options: { name: string; locale?: string; inject?: (sessionId: SessionId) => ModelSelectInjected }) {
      seats.set(options.name, { inject: options.inject, locale: options.locale })
      return () => { seats.delete(options.name) }
    },
  })
  ctx.provide('conversation', {})
  ctx.provide('locale', new LocaleService(ctx))
  const scopes = new Map<SessionId, Context>()
  const addressed = new Set<SessionId>()
  ctx.provide('sessions', {
    scope: (id: SessionId) => scopes.get(id),
    subagentAddress: (id: SessionId) => addressed.has(id)
      ? { parentSessionId: sid('parent'), childSessionId: id, mode: 'continuable' as const }
      : undefined,
  })
  const fiber = ctx.plugin({ inject: [...inject], apply })
  await fiber.await()
  await ctx.plugin(function probe() {}).await()
  const mint = (key: string) => {
    const handle = createScope(ctx, sid(key))
    scopes.set(sid(key), handle.ctx)
    return handle
  }
  return {
    ctx, fiber, mint, calls,
    contribution: () => contribution!,
    seat: () => seats.get('conversation.input.model')!,
    hostCurrent: () => current,
    setHostCurrent: (target: ModelTarget) => { current = target },
    address: (id: SessionId) => { addressed.add(id) },
  }
}

const projection = (id: string) => ({ sessionId: sid(id) })

describe('ui-model dual entry', () => {
  it('registers the /model contribution and the composer model seat', async () => {
    const b = await bench()
    expect(b.contribution().name).toBe('model')
    expect(b.contribution().ui.kind).toBe('popupSelect')
    expect(b.seat().inject).toBeTypeOf('function')
    // Copy rides the standard locale seat.
    expect(b.seat().locale).toBe('model')
  })

  it('popup options mark the host current active with the provider group in the detail', async () => {
    const b = await bench()
    b.mint('s1')
    const options = await b.contribution().ui.options(projection('s1'), new AbortController().signal)
    expect(options.map((o: SelectOption) => o.label)).toEqual(['DeepSeek-V4-Flash', 'DeepSeek-V4-Pro'])
    expect(options[0]).toMatchObject({ active: true, detail: 'DeepSeek' })
    expect(options[1]?.active).toBeUndefined()
  })

  it('a seat selection is the current the popup marks active next — one shared state', async () => {
    const b = await bench()
    b.mint('s1')
    const seatFace = b.seat().inject!(sid('s1'))
    // Switch through the SEAT entry.
    expect(await seatFace.select({
      provider: 'deepseek-official',
      model: 'deepseek-v4-pro',
      reasoningEffort: 'max',
    })).toBe(true)
    expect(b.hostCurrent()).toEqual({
      provider: 'deepseek-official',
      model: 'deepseek-v4-pro',
      reasoningEffort: 'max',
    })
    expect(seatFace.directory.getSnapshot().current).toEqual({
      provider: 'deepseek-official',
      model: 'deepseek-v4-pro',
      reasoningEffort: 'max',
    })
    // The POPUP's next options pass reflects it without a seat-side reload.
    const options = await b.contribution().ui.options(projection('s1'), new AbortController().signal)
    expect(options.find((o: SelectOption) => o.label === 'DeepSeek-V4-Pro')).toMatchObject({ active: true })
  })

  it('a popup selection lands on the seat store — the reverse direction of the same state', async () => {
    const b = await bench()
    b.mint('s1')
    const seatFace = b.seat().inject!(sid('s1'))
    const options = await b.contribution().ui.options(projection('s1'), new AbortController().signal)
    const pro = options.find((o: SelectOption) => o.label === 'DeepSeek-V4-Pro')!
    await b.contribution().ui.onSelect(pro, projection('s1'))
    expect(seatFace.directory.getSnapshot().current).toEqual({
      provider: 'deepseek-official',
      model: 'deepseek-v4-pro',
      reasoningEffort: 'high',
    })
  })

  it('both entries share one directory instance per session, isolated across sessions', async () => {
    const b = await bench()
    b.mint('a')
    b.mint('b')
    const faceA = b.seat().inject!(sid('a'))
    const faceA2 = b.seat().inject!(sid('a'))
    const faceB = b.seat().inject!(sid('b'))
    expect(faceA.directory).toBe(faceA2.directory)
    expect(faceA.directory).not.toBe(faceB.directory)
    // The service face resolves the same instance the seat inject handed out.
    expect(b.ctx.models.directoryFor(sid('a')).store).toBe(faceA.directory)
  })

  it('drops an unconsumed local selection and restores the Host target after reconnect', async () => {
    const b = await bench()
    b.mint('s1')
    const face = b.seat().inject!(sid('s1'))
    await face.select({ provider: 'deepseek-official', model: 'deepseek-v4-pro' })
    b.setHostCurrent({ provider: 'deepseek-official', model: 'deepseek-v4-flash' })

    b.ctx.emit('connection/reset')
    expect(face.directory.getSnapshot()).toMatchObject({ current: null, status: 'loading' })
    await Promise.resolve()
    expect(face.directory.getSnapshot()).toMatchObject({
      current: { provider: 'deepseek-official', model: 'deepseek-v4-flash' },
      status: 'ready',
    })
  })

  it('scope disposal drops the directory; a reborn scope gets a fresh one', async () => {
    const b = await bench()
    const first = b.mint('s1')
    const face1 = b.seat().inject!(sid('s1'))
    await first.fiber.dispose()
    b.mint('s1')
    const face2 = b.seat().inject!(sid('s1'))
    expect(face2.directory).not.toBe(face1.directory)
  })

  it('an unknown session fails loud at the seat inject', async () => {
    const b = await bench()
    expect(() => b.seat().inject!(sid('ghost'))).toThrow(/resolved no scope/)
  })

  it('withholds both model entries from addressed subagent sessions without Agent-bound RPCs', async () => {
    const b = await bench()
    b.mint('child')
    b.address(sid('child'))

    expect(b.contribution().available(projection('child'))).toBe(false)
    await expect(b.contribution().ui.options(
      projection('child'),
      new AbortController().signal,
    )).rejects.toThrow(/unavailable for addressed subagent/)

    const face = b.seat().inject!(sid('child'))
    expect(face.available).toBe(false)
    face.load()
    await expect(face.select({ provider: 'deepseek', model: 'deepseek-v4-pro' })).resolves.toBe(false)
    await expect(b.ctx.models.directoryFor(sid('child')).load())
      .rejects.toThrow(/unavailable for addressed subagent/)
    await expect(b.ctx.models.directoryFor(sid('child')).select({
      provider: 'deepseek',
      model: 'deepseek-v4-pro',
    })).rejects.toThrow(/unavailable for addressed subagent/)
    b.ctx.emit('connection/reset')
    await Promise.resolve()
    expect(b.calls).toEqual({ models: 0, select: 0 })
  })
})