import { afterEach, describe, expect, it, mock, spyOn } from 'bun:test'
import type { ServerWebSocket } from 'bun'
import {
  __resetWebSocketHandlerStateForTests,
  closeSessionConnection,
  getActiveSessionIds,
  handleWebSocket,
  normalizeSlashCommandMetadata,
  type WebSocketData,
} from '../ws/handler.js'
import { conversationService } from '../services/conversationService.js'
import { computerUseApprovalService } from '../services/computerUseApprovalService.js'

function makeClientSocket(sessionId: string) {
  const sent: string[] = []
  return {
    data: {
      sessionId,
      connectedAt: Date.now(),
      channel: 'client',
      sdkToken: null,
      serverPort: 0,
      serverHost: '127.0.0.1',
    },
    send: mock((payload: string) => {
      sent.push(payload)
    }),
    close: mock(() => {}),
    sent,
  } as unknown as ServerWebSocket<WebSocketData> & { sent: string[] }
}

describe('WebSocket handler session isolation', () => {
  afterEach(() => {
    __resetWebSocketHandlerStateForTests()
    mock.restore()
  })

  it('ignores stale disconnects from an older socket for the same session', () => {
    const sessionId = `duplicate-${crypto.randomUUID()}`
    const first = makeClientSocket(sessionId)
    const second = makeClientSocket(sessionId)
    const clearCallbacks = spyOn(conversationService, 'clearOutputCallbacks')
    const cancelComputerUse = spyOn(computerUseApprovalService, 'cancelSession')

    handleWebSocket.open(first)
    handleWebSocket.open(second)
    clearCallbacks.mockClear()
    cancelComputerUse.mockClear()

    handleWebSocket.close(first, 1000, 'stale tab closed')

    expect(getActiveSessionIds()).toContain(sessionId)
    expect(clearCallbacks).not.toHaveBeenCalled()
    expect(cancelComputerUse).not.toHaveBeenCalled()
  })

  it('closes and removes an active client socket when a session is deleted', () => {
    const sessionId = `delete-${crypto.randomUUID()}`
    const ws = makeClientSocket(sessionId)
    const clearCallbacks = spyOn(conversationService, 'clearOutputCallbacks')
    const cancelComputerUse = spyOn(computerUseApprovalService, 'cancelSession')

    handleWebSocket.open(ws)

    expect(closeSessionConnection(sessionId, 'session deleted')).toBe(true)

    expect(getActiveSessionIds()).not.toContain(sessionId)
    expect(ws.close).toHaveBeenCalledWith(1000, 'session deleted')
    expect(clearCallbacks).toHaveBeenCalledWith(sessionId)
    expect(cancelComputerUse).toHaveBeenCalledWith(sessionId)
  })

  it('normalizes slash command metadata while preserving legacy string payloads', () => {
    expect(normalizeSlashCommandMetadata([
      {
        name: 'goal',
        description: 'Create or manage an autonomous completion goal',
        argumentHint: '<objective>|status|pause|resume|clear|complete',
        whenToUse: 'Use when the session should keep iterating until done.',
      },
      'clear',
      { command: 'compact', description: 'Compact context' },
      { name: '   ' },
    ])).toEqual([
      {
        name: 'goal',
        description: 'Create or manage an autonomous completion goal',
        argumentHint: '<objective>|status|pause|resume|clear|complete',
        whenToUse: 'Use when the session should keep iterating until done.',
      },
      { name: 'clear', description: '' },
      { name: 'compact', description: 'Compact context' },
    ])
  })
})