/**
 * http.js 单元测试
 * 测试 HTTP 客户端功能
 */

import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import {
  createRequestSummary,
  getDingTalkErrorDescription,
  sendRequest,
  validateResponse,
} from '../../src/http.js';
import { dingTalkResponses } from '../fixtures/responses/dingtalk-responses.js';

// Mock fetch API
const mockFetch = vi.fn();
global.fetch = mockFetch;

describe('测试 http.js 文件', () => {

  /**
   * 设置 HTTP Mock 的辅助函数
   *
   * @param {object} mockResponse - 模拟的 HTTP 响应
   */
  async function setupHttpMock(mockResponse) {
    const { statusCode = 200, data } = mockResponse;
    const responseText = typeof data === 'string' ? data : JSON.stringify(data);

    mockFetch.mockResolvedValueOnce({
      status: statusCode,
      text: () => Promise.resolve(responseText),
    });
  }

  /**
   * 设置网络错误 Mock 的辅助函数
   *
   * @param {string} errorCode - 模拟的 HTTP 错误码
   */
  function setupNetworkErrorMock(errorCode) {
    const error = new Error(`Network error: ${errorCode}`);
    error.code = errorCode;
    mockFetch.mockRejectedValueOnce(error);
  }

  /**
   * 设置超时 Mock 的辅助函数
   */
  function setupTimeoutMock() {
    const error = new Error('Request timeout');
    error.code = 'TIMEOUT';
    mockFetch.mockRejectedValueOnce(error);
  }

  beforeEach(() => {
    // Mock console 方法
    vi.spyOn(console, 'log').mockImplementation(() => {});
    vi.spyOn(console, 'error').mockImplementation(() => {});
    vi.spyOn(console, 'warn').mockImplementation(() => {});
    vi.spyOn(console, 'debug').mockImplementation(() => {});
  });

  afterEach(() => {
    // 恢复所有 mocks
    vi.restoreAllMocks();
    
    // 重新设置 fetch mock
    mockFetch.mockClear();
  });

  describe('测试 sendRequest 函数', () => {
    const testUrl = 'https://oapi.dingtalk.com/robot/send?access_token=test';
    const testMessage = {
      msgtype: 'text',
      text: {
        content: 'Hello World',
      },
    };

    it('应该成功发送请求', async () => {
      await setupHttpMock({ statusCode: 200, data: dingTalkResponses.success.standard });

      const result = await sendRequest(testUrl, testMessage);

      expect(result.success).toBe(true);
      expect(result.statusCode).toBe(200);
      expect(result.data).toEqual({
        errcode: 0,
        errmsg: 'ok',
      });
      expect(result.error).toBeUndefined();

      // 验证 fetch 被调用
      expect(mockFetch).toHaveBeenCalledWith(testUrl, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'User-Agent': expect.stringContaining('DingTalk-Bot'),
        },
        body: JSON.stringify(testMessage),
      });
    });

    it('应该处理钉钉 API 错误响应', async () => {
      await setupHttpMock({ statusCode: 200, data: dingTalkResponses.error.invalidToken });

      const result = await sendRequest(testUrl, testMessage);

      expect(result.success).toBe(false); // 钉钉 API 错误码非0时 success 为 false
      expect(result.statusCode).toBe(200);
      expect(result.data).toEqual({
        errcode: 310000,
        errmsg: 'keywords not in content',
      });
      expect(result.error).toBeUndefined();
    });

    it('应该处理网络连接错误', async () => {
      setupNetworkErrorMock('ECONNREFUSED');

      const result = await sendRequest(testUrl, testMessage);

      expect(result.success).toBe(false);
      expect(result.statusCode).toBe(0);
      expect(result.data).toEqual({ errcode: -1, errmsg: 'Network error' });
      expect(result.error).toContain('ECONNREFUSED');
    });

    it('应该处理超时错误', async () => {
      setupTimeoutMock();

      const result = await sendRequest(testUrl, testMessage);

      expect(result.success).toBe(false);
      expect(result.statusCode).toBe(0);
      expect(result.data).toEqual({ errcode: -1, errmsg: 'Network error' });
      expect(result.error).toContain('timeout');
    });

    it('应该处理 DNS 解析错误', async () => {
      setupNetworkErrorMock('ENOTFOUND');

      const result = await sendRequest(testUrl, testMessage);

      expect(result.success).toBe(false);
      expect(result.statusCode).toBe(0);
      expect(result.data).toEqual({ errcode: -1, errmsg: 'Network error' });
      expect(result.error).toContain('ENOTFOUND');
    });

    it('应该处理 SSL 错误', async () => {
      setupNetworkErrorMock('CERT_HAS_EXPIRED');

      const result = await sendRequest(testUrl, testMessage);

      expect(result.success).toBe(false);
      expect(result.statusCode).toBe(0);
      expect(result.data).toEqual({ errcode: -1, errmsg: 'Network error' });
      expect(result.error).toContain('CERT_HAS_EXPIRED');
    });

    it('应该处理非 JSON 响应', async () => {
      await setupHttpMock({
        statusCode: 200,
        data: 'Not JSON response',
      });

      const result = await sendRequest(testUrl, testMessage);

      expect(result.success).toBe(false);
      expect(result.statusCode).toBe(200);
      expect(result.data).toEqual({});
      expect(result.error).toContain('JSON parse error');
    });

    it('应该处理空响应', async () => {
      await setupHttpMock({
        statusCode: 200,
        data: '',
      });

      const result = await sendRequest(testUrl, testMessage);

      expect(result.success).toBe(false);
      expect(result.statusCode).toBe(200);
      expect(result.data).toEqual({});
      expect(result.error).toBeUndefined();
    });

    it('应该正确设置请求头', async () => {
      await setupHttpMock({ statusCode: 200, data: dingTalkResponses.success.standard });

      await sendRequest(testUrl, testMessage);

      expect(mockFetch).toHaveBeenCalledWith(testUrl, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'User-Agent': expect.stringContaining('DingTalk-Bot'),
        },
        body: JSON.stringify(testMessage),
      });
    });
  });

  describe('测试 validateResponse 函数', () => {
    it('应该验证有效的成功响应', () => {
      const response = {
        success: true,
        statusCode: 200,
        data: {
          errcode: 0,
          errmsg: 'ok',
          message_id: 'msg123456',
        },
        error: null,
      };

      const result = validateResponse(response);

      expect(result.isValid).toBe(true);
      expect(result.errors).toEqual([]);
    });

    it('应该验证有效的错误响应', () => {
      const response = {
        success: false,
        statusCode: 400,
        data: {
          errcode: 310000,
          errmsg: 'invalid token',
        },
        error: null,
      };

      const result = validateResponse(response);

      expect(result.isValid).toBe(true);
      expect(result.errors).toEqual([]);
    });

    it('应该检测缺少必需字段的响应', () => {
      const response = {
        success: true,
        statusCode: 200,
        data: {
          errcode: 0,
          // 缺少 errmsg
        },
        error: null,
      };

      const result = validateResponse(response);

      expect(result.isValid).toBe(false);
      expect(result.errors).toContain('Missing required field: errmsg');
    });

    it('应该检测字段类型错误', () => {
      const response = {
        success: true,
        statusCode: '200', // 应该是数字
        data: {
          errcode: '0', // 应该是数字
          errmsg: 'ok',
        },
        error: null,
      };

      const result = validateResponse(response);

      expect(result.isValid).toBe(false);
      expect(result.errors).toContain('statusCode must be a number');
      expect(result.errors).toContain('errcode must be a number');
    });

    it('应该检测无效的响应结构', () => {
      const response = null;

      const result = validateResponse(response);

      expect(result.isValid).toBe(false);
      expect(result.errors).toContain('Response is null or undefined');
    });

    it('应该检测缺少 data 字段', () => {
      const response = {
        success: true,
        statusCode: 200,
        error: null,
        // 缺少 data
      };

      const result = validateResponse(response);

      expect(result.isValid).toBe(false);
      expect(result.errors).toContain('Missing required field: data');
    });
  });

  describe('测试 getDingTalkErrorDescription 函数', () => {
    it('应该返回已知错误码的描述', () => {
      expect(getDingTalkErrorDescription(310000)).toBe('无效的 webhook URL 或访问令牌');
      expect(getDingTalkErrorDescription(310001)).toBe('无效签名');
      expect(getDingTalkErrorDescription(310002)).toBe('无效时间戳');
      expect(getDingTalkErrorDescription(310003)).toBe('无效请求格式');
      expect(getDingTalkErrorDescription(310004)).toBe('消息内容过长');
      expect(getDingTalkErrorDescription(310005)).toBe('消息发送频率超限');
      expect(getDingTalkErrorDescription(-1)).toBe('系统繁忙，请稍后再试');
    });

    it('应该返回未知错误码的默认描述', () => {
      expect(getDingTalkErrorDescription(999999)).toBe('未知错误');
      expect(getDingTalkErrorDescription(0)).toBe('请求成功');
    });

    it('应该处理非数字错误码', () => {
      expect(getDingTalkErrorDescription('invalid')).toBe('未知错误');
      expect(getDingTalkErrorDescription(null)).toBe('未知错误');
      expect(getDingTalkErrorDescription(undefined)).toBe('未知错误');
    });
  });

  describe('测试 createRequestSummary 函数', () => {
    it('应该为成功响应创建摘要', () => {
      const response = {
        success: true,
        statusCode: 200,
        data: {
          errcode: 0,
          errmsg: 'ok',
          message_id: 'msg123456',
        },
        error: null,
        duration: 150,
      };

      const summary = createRequestSummary(response);

      expect(summary).toContain('Status: 200');
      expect(summary).toContain('Duration: 150ms');
      expect(summary).toContain('DingTalk Code: 0');
    });

    it('应该为失败响应创建摘要', () => {
      const response = {
        success: false,
        statusCode: 400,
        data: {
          errcode: 310000,
          errmsg: 'invalid token',
        },
        error: null,
        duration: 200,
      };

      const summary = createRequestSummary(response);

      expect(summary).toContain('Status: 400');
      expect(summary).toContain('Duration: 200ms');
      expect(summary).toContain('DingTalk Code: 310000');
      expect(summary).toContain('无效的 webhook URL 或访问令牌');
    });

    it('应该为网络错误创建摘要', () => {
      const response = {
        success: false,
        statusCode: 0,
        data: {},
        error: 'ECONNREFUSED',
        duration: 5000,
      };

      const summary = createRequestSummary(response);

      expect(summary).toContain('Status: 0');
      expect(summary).toContain('Duration: 5000ms');
      expect(summary).toContain('Error: ECONNREFUSED');
    });

    it('应该处理缺少消息ID的成功响应', () => {
      const response = {
        success: true,
        statusCode: 200,
        data: {
          errcode: 0,
          errmsg: 'ok',
          // 缺少 message_id
        },
        error: null,
        duration: 100,
      };

      const summary = createRequestSummary(response);

      expect(summary).toContain('Status: 200');
      expect(summary).toContain('Duration: 100ms');
      expect(summary).toContain('DingTalk Code: 0');
      expect(summary).not.toContain('undefined');
    });

    it('应该处理空的错误消息', () => {
      const response = {
        success: false,
        statusCode: 400,
        data: {
          errcode: 300001,
          errmsg: '',
        },
        error: null,
        duration: 250,
      };

      const summary = createRequestSummary(response);

      expect(summary).toContain('Status: 400');
      expect(summary).toContain('Duration: 250ms');
      expect(summary).toContain('DingTalk Code: 300001');
      expect(summary).toContain('未知错误');
    });
  });

  describe('边界条件测试', () => {
    const testUrl = 'https://oapi.dingtalk.com/robot/send?access_token=test';
    const testMessage = { msgtype: 'text', text: { content: 'test' } };

    it('应该处理极大的响应数据', async () => {
      const largeData = {
        errcode: 0,
        errmsg: 'ok',
        message_id: 'msg123456',
        large_field: 'x'.repeat(10000), // 10KB 的数据
      };

      await setupHttpMock({
        statusCode: 200,
        data: largeData,
      });

      const result = await sendRequest(testUrl, testMessage);

      expect(result.success).toBe(true);
      expect(result.data.large_field).toBe('x'.repeat(10000));
    });

    it('应该处理特殊字符的响应', async () => {
      const specialData = {
        errcode: 0,
        errmsg: 'ok with 特殊字符 and émojis 🎉',
        message_id: 'msg123456',
      };

      await setupHttpMock({
        statusCode: 200,
        data: specialData,
      });

      const result = await sendRequest(testUrl, testMessage);

      expect(result.success).toBe(true);
      expect(result.data.errmsg).toBe('ok with 特殊字符 and émojis 🎉');
    });

    it('应该处理畸形的 JSON 响应', async () => {
      await setupHttpMock(dingTalkResponses.special.malformedJson);

      const result = await sendRequest(testUrl, testMessage);

      expect(result.success).toBe(false);
      expect(result.error).toBeDefined();
      expect(typeof result.error).toBe('string');
      expect(result.error).toContain('JSON parse error');
    });
  });
});