import { beforeEach, describe, expect, it, vi } from 'vitest'

import { createSlashHandler } from '../app/createSlashHandler.js'
import { getOverlayState, resetOverlayState } from '../app/overlayStore.js'
import { getUiState, resetUiState } from '../app/uiStore.js'

describe('createSlashHandler', () => {
  beforeEach(() => {
    resetOverlayState()
    resetUiState()
  })

  it('opens the resume picker locally', () => {
    const ctx = buildCtx()

    expect(createSlashHandler(ctx)('/resume')).toBe(true)
    expect(getOverlayState().picker).toBe(true)
  })

  it('cycles details mode and persists it', async () => {
    const ctx = buildCtx()

    expect(getUiState().detailsMode).toBe('collapsed')
    expect(createSlashHandler(ctx)('/details toggle')).toBe(true)
    expect(getUiState().detailsMode).toBe('expanded')
    expect(ctx.gateway.rpc).toHaveBeenCalledWith('config.set', {
      key: 'details_mode',
      value: 'expanded'
    })
    expect(ctx.transcript.sys).toHaveBeenCalledWith('details: expanded')
  })

  it('shows tool enable usage when names are missing', () => {
    const ctx = buildCtx()

    expect(createSlashHandler(ctx)('/tools enable')).toBe(true)
    expect(ctx.transcript.sys).toHaveBeenNthCalledWith(1, 'usage: /tools enable <name> [name ...]')
    expect(ctx.transcript.sys).toHaveBeenNthCalledWith(2, 'built-in toolset: /tools enable web')
    expect(ctx.transcript.sys).toHaveBeenNthCalledWith(3, 'MCP tool: /tools enable github:create_issue')
  })

  it('drops stale slash.exec output after a newer slash', async () => {
    let resolveLate: (v: { output?: string }) => void
    let slashExecCalls = 0

    const ctx = buildCtx({
      gateway: {
        gw: {
          getLogTail: vi.fn(() => ''),
          request: vi.fn((method: string) => {
            if (method === 'slash.exec') {
              slashExecCalls += 1

              if (slashExecCalls === 1) {
                return new Promise<{ output?: string }>(res => {
                  resolveLate = res
                })
              }

              return Promise.resolve({ output: 'fresh' })
            }

            return Promise.resolve({})
          })
        },
        rpc: vi.fn(() => Promise.resolve({}))
      }
    })

    const h = createSlashHandler(ctx)
    expect(h('/slow')).toBe(true)
    expect(h('/fast')).toBe(true)
    resolveLate!({ output: 'too late' })
    await vi.waitFor(() => {
      expect(ctx.transcript.sys).toHaveBeenCalled()
    })

    expect(ctx.transcript.sys).not.toHaveBeenCalledWith('too late')
  })

  it('dispatches command.dispatch with typed alias', async () => {
    const ctx = buildCtx({
      gateway: {
        gw: {
          getLogTail: vi.fn(() => ''),
          request: vi.fn((method: string) => {
            if (method === 'slash.exec') {
              return Promise.reject(new Error('no'))
            }

            if (method === 'command.dispatch') {
              return Promise.resolve({ type: 'alias', target: 'help' })
            }

            return Promise.resolve({})
          })
        },
        rpc: vi.fn(() => Promise.resolve({}))
      }
    })

    const h = createSlashHandler(ctx)
    expect(h('/zzz')).toBe(true)
    await vi.waitFor(() => {
      expect(ctx.transcript.panel).toHaveBeenCalledWith(expect.any(String), expect.any(Array))
    })
  })

  it('resolves unique local aliases through the catalog', () => {
    const ctx = buildCtx({
      local: {
        catalog: {
          canon: {
            '/h': '/help',
            '/help': '/help'
          }
        }
      }
    })

    expect(createSlashHandler(ctx)('/h')).toBe(true)
    expect(ctx.transcript.panel).toHaveBeenCalledWith(expect.any(String), expect.any(Array))
  })
})

const buildCtx = (overrides: Partial<Ctx> = {}): Ctx => ({
  ...overrides,
  slashFlightRef: overrides.slashFlightRef ?? { current: 0 },
  composer: { ...buildComposer(), ...overrides.composer },
  gateway: { ...buildGateway(), ...overrides.gateway },
  local: { ...buildLocal(), ...overrides.local },
  session: { ...buildSession(), ...overrides.session },
  transcript: { ...buildTranscript(), ...overrides.transcript },
  voice: { ...buildVoice(), ...overrides.voice }
})

const buildComposer = () => ({
  enqueue: vi.fn(),
  hasSelection: false,
  paste: vi.fn(),
  queueRef: { current: [] as string[] },
  selection: { copySelection: vi.fn(() => '') },
  setInput: vi.fn()
})

const buildGateway = () => ({
  gw: {
    getLogTail: vi.fn(() => ''),
    request: vi.fn(() => Promise.resolve({}))
  },
  rpc: vi.fn(() => Promise.resolve({}))
})

const buildLocal = () => ({
  catalog: null,
  getHistoryItems: vi.fn(() => []),
  getLastUserMsg: vi.fn(() => ''),
  maybeWarn: vi.fn()
})

const buildSession = () => ({
  closeSession: vi.fn(() => Promise.resolve(null)),
  die: vi.fn(),
  guardBusySessionSwitch: vi.fn(() => false),
  newSession: vi.fn(),
  resetVisibleHistory: vi.fn(),
  resumeById: vi.fn(),
  setSessionStartedAt: vi.fn()
})

const buildTranscript = () => ({
  page: vi.fn(),
  panel: vi.fn(),
  send: vi.fn(),
  setHistoryItems: vi.fn(),
  sys: vi.fn(),
  trimLastExchange: vi.fn(items => items)
})

const buildVoice = () => ({
  setVoiceEnabled: vi.fn()
})

interface Ctx {
  slashFlightRef: { current: number }
  composer: ReturnType<typeof buildComposer>
  gateway: ReturnType<typeof buildGateway>
  local: ReturnType<typeof buildLocal>
  session: ReturnType<typeof buildSession>
  transcript: ReturnType<typeof buildTranscript>
  voice: ReturnType<typeof buildVoice>
}