import { describe, test, expect } from 'bun:test'
import { toClientPayload } from '../transport/client-payload'
import type { SessionEvent } from '../transport/event-bus'

function makeEvent(
  overrides: Partial<SessionEvent> & Pick<SessionEvent, 'type' | 'sessionId'>,
): SessionEvent {
  return {
    id: 'evt-1',
    payload: null,
    direction: 'inbound',
    seqNum: 1,
    createdAt: Date.now(),
    ...overrides,
  }
}

// =============================================================================
// user / user_message
// =============================================================================

describe('toClientPayload — user message', () => {
  test('maps user type with content', () => {
    const event = makeEvent({
      type: 'user',
      sessionId: 'sess-1',
      payload: { content: 'hello' },
    })
    const result = toClientPayload(event)
    expect(result.type).toBe('user')
    expect(result.session_id).toBe('sess-1')
    expect((result as any).message.role).toBe('user')
    expect((result as any).message.content).toBe('hello')
  })

  test('maps user_message type same as user', () => {
    const event = makeEvent({
      type: 'user_message',
      sessionId: 'sess-2',
      payload: { content: 'world' },
    })
    const result = toClientPayload(event)
    expect(result.type).toBe('user')
    expect(result.session_id).toBe('sess-2')
  })

  test('falls back to message field when content is missing', () => {
    const event = makeEvent({
      type: 'user',
      sessionId: 'sess-3',
      payload: { message: 'fallback msg' },
    })
    const result = toClientPayload(event)
    expect((result as any).message.content).toBe('fallback msg')
  })

  test('falls back to empty string when both content and message missing', () => {
    const event = makeEvent({
      type: 'user',
      sessionId: 'sess-4',
      payload: {},
    })
    const result = toClientPayload(event)
    expect((result as any).message.content).toBe('')
  })

  test('includes isSynthetic when true', () => {
    const event = makeEvent({
      type: 'user',
      sessionId: 'sess-5',
      payload: { content: 'auto', isSynthetic: true },
    })
    const result = toClientPayload(event)
    expect((result as any).isSynthetic).toBe(true)
  })

  test('does not include isSynthetic when false', () => {
    const event = makeEvent({
      type: 'user',
      sessionId: 'sess-6',
      payload: { content: 'manual', isSynthetic: false },
    })
    const result = toClientPayload(event)
    expect((result as any).isSynthetic).toBeUndefined()
  })

  test('uses payload.uuid when present', () => {
    const event = makeEvent({
      type: 'user',
      sessionId: 'sess-7',
      payload: { content: 'hi', uuid: 'custom-uuid' },
    })
    const result = toClientPayload(event)
    expect(result.uuid).toBe('custom-uuid')
  })

  test('falls back to event.id when payload.uuid is missing', () => {
    const event = makeEvent({
      type: 'user',
      sessionId: 'sess-8',
      payload: { content: 'hi' },
    })
    const result = toClientPayload(event)
    expect(result.uuid).toBe('evt-1')
  })
})

// =============================================================================
// permission_response / control_response
// =============================================================================

describe('toClientPayload — permission response', () => {
  test('approved=true maps to allow behavior', () => {
    const event = makeEvent({
      type: 'permission_response',
      sessionId: 'sess-1',
      payload: { approved: true, request_id: 'req-1' },
    })
    const result = toClientPayload(event)
    expect(result.type).toBe('control_response')
    const resp = (result as any).response
    expect(resp.subtype).toBe('success')
    expect(resp.request_id).toBe('req-1')
    expect(resp.response.behavior).toBe('allow')
  })

  test('approved=false maps to deny behavior with error', () => {
    const event = makeEvent({
      type: 'permission_response',
      sessionId: 'sess-2',
      payload: { approved: false, request_id: 'req-2' },
    })
    const result = toClientPayload(event)
    expect(result.type).toBe('control_response')
    const resp = (result as any).response
    expect(resp.subtype).toBe('error')
    expect(resp.error).toBe('Permission denied by user')
    expect(resp.response.behavior).toBe('deny')
  })

  test('approved=false includes feedback message when provided', () => {
    const event = makeEvent({
      type: 'permission_response',
      sessionId: 'sess-3',
      payload: {
        approved: false,
        request_id: 'req-3',
        message: 'please revise',
      },
    })
    const result = toClientPayload(event)
    expect((result as any).response.message).toBe('please revise')
  })

  test('passes through existingResponse directly', () => {
    const existingResponse = { subtype: 'success', custom: true }
    const event = makeEvent({
      type: 'control_response',
      sessionId: 'sess-4',
      payload: { approved: true, response: existingResponse },
    })
    const result = toClientPayload(event)
    expect(result.type).toBe('control_response')
    expect((result as any).response).toBe(existingResponse)
  })

  test('includes updatedInput when approved with updated_input', () => {
    const updatedInput = { file_path: '/new/path' }
    const event = makeEvent({
      type: 'permission_response',
      sessionId: 'sess-5',
      payload: {
        approved: true,
        request_id: 'req-5',
        updated_input: updatedInput,
      },
    })
    const result = toClientPayload(event)
    expect((result as any).response.response.updatedInput).toEqual(updatedInput)
  })

  test('includes updatedPermissions when approved with updated_permissions', () => {
    const perms = [{ type: 'allow', tool: 'bash' }]
    const event = makeEvent({
      type: 'permission_response',
      sessionId: 'sess-6',
      payload: {
        approved: true,
        request_id: 'req-6',
        updated_permissions: perms,
      },
    })
    const result = toClientPayload(event)
    expect((result as any).response.response.updatedPermissions).toEqual(perms)
  })
})

// =============================================================================
// interrupt
// =============================================================================

describe('toClientPayload — interrupt', () => {
  test('maps interrupt to control_request with subtype interrupt', () => {
    const event = makeEvent({
      type: 'interrupt',
      sessionId: 'sess-1',
    })
    const result = toClientPayload(event)
    expect(result.type).toBe('control_request')
    expect((result as any).request_id).toBe('evt-1')
    expect((result as any).request.subtype).toBe('interrupt')
  })
})

// =============================================================================
// control_request
// =============================================================================

describe('toClientPayload — control_request', () => {
  test('passes through request_id and request from payload', () => {
    const event = makeEvent({
      type: 'control_request',
      sessionId: 'sess-1',
      payload: {
        request_id: 'req-99',
        request: { subtype: 'permission', tool: 'bash' },
      },
    })
    const result = toClientPayload(event)
    expect(result.type).toBe('control_request')
    expect((result as any).request_id).toBe('req-99')
    expect((result as any).request.subtype).toBe('permission')
  })

  test('falls back request to payload when no request field', () => {
    const event = makeEvent({
      type: 'control_request',
      sessionId: 'sess-2',
      payload: { request_id: 'req-10', custom: 'data' },
    })
    const result = toClientPayload(event)
    expect((result as any).request).toEqual({
      request_id: 'req-10',
      custom: 'data',
    })
  })

  test('falls back request_id to event.id when missing', () => {
    const event = makeEvent({
      type: 'control_request',
      sessionId: 'sess-3',
      payload: { request: { subtype: 'test' } },
    })
    const result = toClientPayload(event)
    expect((result as any).request_id).toBe('evt-1')
  })
})

// =============================================================================
// default fallback
// =============================================================================

describe('toClientPayload — default types', () => {
  test('passes through unknown type with type/uuid/session_id/message', () => {
    const event = makeEvent({
      type: 'assistant',
      sessionId: 'sess-1',
      payload: { uuid: 'u-1', content: 'response text' },
    })
    const result = toClientPayload(event)
    expect(result.type).toBe('assistant')
    expect(result.uuid).toBe('u-1')
    expect(result.session_id).toBe('sess-1')
    expect(result.message).toEqual({ uuid: 'u-1', content: 'response text' })
  })
})