/**
 * Anthropic system cache_control 断言测试（v0.7.3 P1-1）
 *
 * Anthropic 缓存按"内容块前缀"命中：system 必须以块数组传递并在块上打
 * cache_control 才可缓存。本文件锁定：
 * C1 非空 system → 块数组 + {type:'ephemeral'}；
 * C2 空 system → 保持空字符串（不发空块）；
 * C3 thinking 模式下断言仍然存在（cache 与 thinking 不互斥）；
 * C4 system 块文本为四分区完整拼接（roleDefinition/outputConstraints/
 *    safetyGuidelines/dynamicReminders）。
 */

import { describe, it, expect, vi, afterEach } from 'vitest';

vi.mock('electron-log', () => ({
  default: { info: vi.fn(), warn: vi.fn(), error: vi.fn(), debug: vi.fn() },
}));

import { AnthropicAdapter } from '../anthropic.adapter';
import type { MetonaRequest } from '../../types';

function captureFetch(): { bodies: Array<Record<string, unknown>> } {
  const bodies: Array<Record<string, unknown>> = [];
  const genericBody = {
    content: [{ type: 'text', text: 'ok' }],
    usage: { input_tokens: 3, output_tokens: 2 },
    stop_reason: 'end_turn',
  };
  const fetchMock = vi.fn(async (_url: string | URL, init?: RequestInit) => {
    bodies.push(JSON.parse(String(init?.body ?? '{}')) as Record<string, unknown>);
    return new Response(JSON.stringify(genericBody), {
      status: 200,
      headers: { 'Content-Type': 'application/json' },
    });
  });
  vi.stubGlobal('fetch', fetchMock);
  return { bodies };
}

afterEach(() => {
  vi.unstubAllGlobals();
});

function makeAdapter(): AnthropicAdapter {
  return new AnthropicAdapter({
    provider: 'anthropic',
    baseURL: 'http://a.test',
    apiKey: 'k',
    defaultModel: 'claude-sonnet-4-5',
  });
}

function makeRequest(overrides?: Partial<MetonaRequest>): MetonaRequest {
  return {
    meta: {
      sessionId: 's1',
      iteration: 1,
      requestId: 'r1',
      timestamp: Date.now(),
      agentVersion: 'test',
    },
    systemPrompt: {
      roleDefinition: 'You are Metona.',
      outputConstraints: 'Be concise.',
      safetyGuidelines: 'Stay safe.',
      dynamicReminders: '## Current Workspace\n`/ws`',
    },
    messages: [{ role: 'user', content: 'hi', timestamp: Date.now() }],
    params: { maxTokens: 63_488, temperature: 0, stream: false },
    ...overrides,
  };
}

describe('AnthropicAdapter — system cache_control（P1-1）', () => {
  it('C1: 非空 system → 单 text 块 + cache_control ephemeral', async () => {
    const adapter = makeAdapter();
    const { bodies } = captureFetch();
    await adapter.send(makeRequest());

    const system = bodies[0].system as Array<{
      type: string;
      text: string;
      cache_control: { type: string };
    }>;
    expect(Array.isArray(system)).toBe(true);
    expect(system).toHaveLength(1);
    expect(system[0].type).toBe('text');
    expect(system[0].cache_control).toEqual({ type: 'ephemeral' });
  });

  it('C2: 空 system → 保持空字符串（不发空块）', async () => {
    const adapter = makeAdapter();
    const { bodies } = captureFetch();
    await adapter.send(
      makeRequest({
        systemPrompt: { roleDefinition: '', outputConstraints: '', safetyGuidelines: '' },
      }),
    );
    expect(bodies[0].system).toBe('');
  });

  it('C3: thinking 模式下 cache_control 断言仍然存在', async () => {
    const adapter = makeAdapter();
    const { bodies } = captureFetch();
    await adapter.send(
      makeRequest({
        params: {
          maxTokens: 8192,
          temperature: 0,
          stream: false,
          thinkingEnabled: true,
          thinkingEffort: 'high',
        },
      }),
    );
    const system = bodies[0].system as Array<{ cache_control: { type: string } }>;
    expect(system[0].cache_control).toEqual({ type: 'ephemeral' });
    // thinking 与 cache 共存：thinking 块也在请求体中
    expect(bodies[0].thinking).toMatchObject({ type: 'enabled' });
  });

  it('C4: system 块文本为四分区完整拼接', async () => {
    const adapter = makeAdapter();
    const { bodies } = captureFetch();
    await adapter.send(makeRequest());

    const system = bodies[0].system as Array<{ text: string }>;
    expect(system[0].text).toContain('You are Metona.');
    expect(system[0].text).toContain('Be concise.');
    expect(system[0].text).toContain('Stay safe.');
    expect(system[0].text).toContain('## Current Workspace');
  });
});