// tests/main/services/llm-limits-routing-redteam-r2-1.test.ts
//  - Premium 단일 턴(generate/processText)은 프록시 한도를 넘으면 보내지 않고 LLMPromptTooLong
//  - 단일 턴도 호출 단위 signal 로 취소된다(전역 cancelGeneration 없이)
//  - 게이트웨이: 취소는 로컬로 폴백하지 않는다, 채팅 스트림에 signal 을 넘긴다

import { beforeEach, describe, expect, it, vi } from 'vitest'
import { ErrorCode } from '@d3ro/core/errors'
import { LLM_PROXY_CHAT_LIMITS } from '@d3ro/core/llm-chat'
import {
  createRoutedLlmGateway,
  type LocalLlmAdapter,
  type PremiumLlmAdapter,
} from '../../../src/main/services/llm/LlmGateway'

vi.mock('../../../src/main/services/LoggerService', () => ({
  getLogger: () => ({ info: vi.fn(), warn: vi.fn(), error: vi.fn(), debug: vi.fn() }),
}))

const cloud = vi.hoisted(() => ({
  isEnabled: (): boolean => true,
  isAuthenticated: (): boolean => true,
  invokeFunctionStream: vi.fn(),
  invokeFunction: vi.fn(),
}))

vi.mock('../../../src/main/services/CloudSyncService', () => ({
  getCloudSyncService: () => cloud,
}))

import { getPremiumLLMService, resetPremiumLLMServiceForTests } from '../../../src/main/services/PremiumLLMService'

const okResponse = {
  data: {
    id: 'm', model: 'claude', role: 'assistant',
    content: [{ type: 'text', text: '결과' }],
    stop_reason: 'end_turn', usage: { input_tokens: 1, output_tokens: 1 },
  },
  error: null,
}

describe('PremiumLLMService 단일 턴 한도', () => {
  beforeEach(() => {
    resetPremiumLLMServiceForTests()
    cloud.invokeFunction.mockReset()
    cloud.invokeFunction.mockResolvedValue(okResponse)
  })

  it('8,000자를 넘는 generate 입력은 보내지 않고 LLMPromptTooLong 이다', async () => {
    const text = 'x'.repeat(LLM_PROXY_CHAT_LIMITS.maxMessageChars + 1)
    await expect(getPremiumLLMService().generate(text)).rejects.toMatchObject({ code: ErrorCode.LLMPromptTooLong })
    expect(cloud.invokeFunction).not.toHaveBeenCalled()
  })

  it('system 이 한도를 넘어도 보내지 않는다', async () => {
    await expect(
      getPremiumLLMService().generate('q', { systemPrompt: 's'.repeat(LLM_PROXY_CHAT_LIMITS.maxSystemChars + 1) }),
    ).rejects.toMatchObject({ code: ErrorCode.LLMPromptTooLong })
    await expect(
      getPremiumLLMService().processText('y'.repeat(LLM_PROXY_CHAT_LIMITS.maxMessageChars + 1), 'refine'),
    ).rejects.toMatchObject({ code: ErrorCode.LLMPromptTooLong })
    expect(cloud.invokeFunction).not.toHaveBeenCalled()
  })

  it('경계값(정확히 8,000자, 앞뒤 공백 제외)은 보낸다', async () => {
    const text = `  ${'x'.repeat(LLM_PROXY_CHAT_LIMITS.maxMessageChars)}  `
    await expect(getPremiumLLMService().generate(text)).resolves.toEqual({ text: '결과' })
    expect(cloud.invokeFunction).toHaveBeenCalledTimes(1)
  })

  it('단일 턴도 호출 단위 signal 로 취소된다(cancelGeneration 없이)', async () => {
    cloud.invokeFunction.mockImplementation(
      (_n: string, _b: unknown, options?: { signal?: AbortSignal }) =>
        new Promise((resolve) => {
          options?.signal?.addEventListener('abort', () =>
            resolve({ data: null, error: { message: 'FunctionsFetchError: aborted' } }), { once: true })
        }),
    )
    const controller = new AbortController()
    const pending = getPremiumLLMService().generate('q', { signal: controller.signal })
    controller.abort()
    await expect(pending).rejects.toMatchObject({ code: ErrorCode.LLMProcessingCancelled })
  })
})

async function* tokens(...values: string[]): AsyncGenerator<string, string> {
  for (const v of values) yield v
  return values.join('')
}

function premium(overrides: Partial<PremiumLlmAdapter> = {}): PremiumLlmAdapter {
  return {
    isAvailable: vi.fn(() => true),
    processText: vi.fn(async () => 'premium'),
    generate: vi.fn(async () => ({ text: 'premium' })),
    chatStream: vi.fn(() => tokens('p')),
    cancelGeneration: vi.fn(),
    ...overrides,
  }
}

function local(overrides: Partial<LocalLlmAdapter> = {}): LocalLlmAdapter {
  return {
    isAvailable: vi.fn(() => true),
    processText: vi.fn(async () => 'local'),
    generate: vi.fn(async () => ({ text: 'local' })),
    chatStream: vi.fn(() => tokens('l')),
    cancelGeneration: vi.fn(),
    ...overrides,
  }
}

describe('LlmGateway 호출 단위 취소', () => {
  it('Premium 호출이 취소되면 로컬로 폴백하지 않고 취소를 전파한다', async () => {
    const controller = new AbortController()
    const l = local()
    const p = premium({
      generate: vi.fn(async () => {
        controller.abort()
        throw Object.assign(new Error('cancelled'), { code: ErrorCode.LLMProcessingCancelled })
      }),
    })
    const gw = createRoutedLlmGateway({ getBackend: () => 'online', loadPremium: async () => p, getLocal: () => l })

    await expect(gw.generate('q', undefined, { signal: controller.signal })).rejects.toBeTruthy()
    expect(l.generate).not.toHaveBeenCalled()
  })

  it('signal 을 Premium 단일 턴·채팅 스트림에 넘기고, 다른 호출은 건드리지 않는다', async () => {
    const p = premium()
    const gw = createRoutedLlmGateway({ getBackend: () => 'online', loadPremium: async () => p, getLocal: () => local() })
    const a = new AbortController()
    const b = new AbortController()

    await gw.processText('t', 'refine', undefined, undefined, { signal: a.signal })
    await gw.openChatStream([{ role: 'user', content: 'hi' }], { signal: b.signal })
    a.abort()

    expect(p.processText).toHaveBeenCalledWith('t', 'refine', undefined, undefined, { signal: a.signal })
    expect(p.chatStream).toHaveBeenCalledWith([{ role: 'user', content: 'hi' }], { signal: b.signal })
    expect(b.signal.aborted).toBe(false)
    expect(p.cancelGeneration).not.toHaveBeenCalled()
  })

  it('이미 취소된 signal 이면 어떤 백엔드도 부르지 않는다', async () => {
    const controller = new AbortController()
    controller.abort()
    const l = local()
    const gw = createRoutedLlmGateway({ getBackend: () => 'local', loadPremium: async () => premium(), getLocal: () => l })
    await expect(gw.processText('t', 'refine', undefined, undefined, { signal: controller.signal })).rejects.toMatchObject({
      code: ErrorCode.LLMProcessingCancelled,
    })
    expect(l.processText).not.toHaveBeenCalled()
  })
})