/**
 * DeepSeekAdapter.getBalance 解析测试（v0.5.2 回归修复）
 *
 * 背景：DeepSeek 官方 /user/balance 实际返回 balance_infos 数组格式，
 * 此前按扁平字段解析（data.total_balance）→ 恒为 undefined → 界面永远显示 0。
 * 本测试固化两种格式（官方数组 + 网关扁平）的解析与 URL 规范化行为。
 */

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 { DeepSeekAdapter } from '../deepseek.adapter';

const CONFIG = {
  provider: 'deepseek',
  baseURL: 'https://api.deepseek.com',
  apiKey: 'sk-test-key',
  defaultModel: 'deepseek-v4-pro',
};

function makeAdapter(baseURL = CONFIG.baseURL): DeepSeekAdapter {
  return new DeepSeekAdapter({ ...CONFIG, baseURL });
}

const mockFetch = vi.fn();
vi.stubGlobal('fetch', mockFetch);

afterEach(() => {
  mockFetch.mockReset();
});

function okResponse(body: unknown): Response {
  return {
    ok: true,
    status: 200,
    json: async () => body,
  } as unknown as Response;
}

describe('DeepSeekAdapter.getBalance — 响应格式解析（v0.5.2）', () => {
  it('官方 balance_infos 数组格式正确解析（真实 API 格式，修复点）', async () => {
    mockFetch.mockResolvedValue(
      okResponse({
        is_available: true,
        balance_infos: [
          {
            currency: 'CNY',
            total_balance: '110.55',
            granted_balance: '10.55',
            topped_up_balance: '100.00',
          },
        ],
      }),
    );

    const balance = await makeAdapter().getBalance();
    expect(balance).not.toBeNull();
    expect(balance!.totalBalance).toBe('110.55');
    expect(balance!.grantedBalance).toBe('10.55');
    expect(balance!.toppedUpBalance).toBe('100.00');
    expect(balance!.currency).toBe('CNY');
  });

  it('扁平格式回退解析（网关/代理简化响应兼容）', async () => {
    mockFetch.mockResolvedValue(
      okResponse({
        currency: 'USD',
        total_balance: '50.00',
        granted_balance: '0.00',
        topped_up_balance: '50.00',
      }),
    );

    const balance = await makeAdapter().getBalance();
    expect(balance).not.toBeNull();
    expect(balance!.totalBalance).toBe('50.00');
    expect(balance!.currency).toBe('USD');
  });

  it('baseURL 带尾斜杠或 /v1 前缀时规范化为根路径端点', async () => {
    mockFetch.mockResolvedValue(
      okResponse({
        balance_infos: [{ currency: 'CNY', total_balance: '1.00' }],
      }),
    );

    await makeAdapter('https://api.deepseek.com/v1/').getBalance();
    expect(mockFetch).toHaveBeenCalledWith(
      'https://api.deepseek.com/user/balance',
      expect.objectContaining({ headers: { Authorization: 'Bearer sk-test-key' } }),
    );

    mockFetch.mockClear();
    await makeAdapter('https://api.deepseek.com/v1').getBalance();
    expect(mockFetch).toHaveBeenCalledWith(
      'https://api.deepseek.com/user/balance',
      expect.anything(),
    );
  });

  it('非 2xx 响应返回 null', async () => {
    mockFetch.mockResolvedValue({ ok: false, status: 401 } as unknown as Response);
    expect(await makeAdapter().getBalance()).toBeNull();
  });

  it('请求异常返回 null（网络错误）', async () => {
    mockFetch.mockRejectedValue(new Error('network down'));
    expect(await makeAdapter().getBalance()).toBeNull();
  });

  it('balance_infos 多币种时取第一项', async () => {
    mockFetch.mockResolvedValue(
      okResponse({
        balance_infos: [
          { currency: 'CNY', total_balance: '100.00' },
          { currency: 'USD', total_balance: '13.00' },
        ],
      }),
    );
    const balance = await makeAdapter().getBalance();
    expect(balance!.currency).toBe('CNY');
    expect(balance!.totalBalance).toBe('100.00');
  });

  it('balance_infos 为空数组 → 回退扁平字段（无第一项可取）', async () => {
    mockFetch.mockResolvedValue(
      okResponse({ balance_infos: [], currency: 'EUR', total_balance: '9.99' }),
    );
    const balance = await makeAdapter().getBalance();
    expect(balance!.currency).toBe('EUR');
    expect(balance!.totalBalance).toBe('9.99');
  });

  it('balance_infos 首项字段缺失 → 默认 CNY / 0 兜底', async () => {
    mockFetch.mockResolvedValue(okResponse({ balance_infos: [{}] }));
    const balance = await makeAdapter().getBalance();
    expect(balance).toEqual({
      currency: 'CNY',
      totalBalance: '0',
      grantedBalance: '0',
      toppedUpBalance: '0',
    });
  });

  it('is_available=false 仍返回余额（可用性由上层决定，解析不短路）', async () => {
    mockFetch.mockResolvedValue(
      okResponse({
        is_available: false,
        balance_infos: [{ currency: 'CNY', total_balance: '0.5' }],
      }),
    );
    const balance = await makeAdapter().getBalance();
    expect(balance!.totalBalance).toBe('0.5');
  });

  it('json 解析失败（非法响应体）→ 返回 null', async () => {
    mockFetch.mockResolvedValue({
      ok: true,
      status: 200,
      json: async () => {
        throw new Error('Unexpected token');
      },
    } as unknown as Response);
    expect(await makeAdapter().getBalance()).toBeNull();
  });

  it('带 /v1 且带尾斜杠的 baseURL 规范化为根路径', async () => {
    mockFetch.mockResolvedValue(okResponse({ balance_infos: [{ total_balance: '1' }] }));
    await makeAdapter('https://api.deepseek.com/v1/').getBalance();
    expect(mockFetch).toHaveBeenCalledWith(
      'https://api.deepseek.com/user/balance',
      expect.anything(),
    );
  });

  it('多级尾斜杠 baseURL 规范化为根路径', async () => {
    mockFetch.mockResolvedValue(okResponse({ balance_infos: [{ total_balance: '1' }] }));
    await makeAdapter('https://api.deepseek.com///').getBalance();
    expect(mockFetch).toHaveBeenCalledWith(
      'https://api.deepseek.com/user/balance',
      expect.anything(),
    );
  });

  it('无 /v1 前缀的 baseURL 原样拼接（不重复插入）', async () => {
    mockFetch.mockResolvedValue(okResponse({ balance_infos: [{ total_balance: '1' }] }));
    await makeAdapter('https://api.deepseek.com').getBalance();
    expect(mockFetch).toHaveBeenCalledWith(
      'https://api.deepseek.com/user/balance',
      expect.anything(),
    );
  });

  it('子路径 baseURL（非 /v1 结尾）保留子路径', async () => {
    mockFetch.mockResolvedValue(okResponse({ balance_infos: [{ total_balance: '1' }] }));
    await makeAdapter('https://proxy.example.com/gw/v2').getBalance();
    expect(mockFetch).toHaveBeenCalledWith(
      'https://proxy.example.com/gw/v2/user/balance',
      expect.anything(),
    );
  });

  it('请求头携带 Bearer apiKey', async () => {
    mockFetch.mockResolvedValue(okResponse({ balance_infos: [{ total_balance: '1' }] }));
    await makeAdapter().getBalance();
    const [, init] = mockFetch.mock.calls[0] as [string, RequestInit];
    expect((init.headers as Record<string, string>).Authorization).toBe('Bearer sk-test-key');
  });

  it('网络异常与解析异常不抛出，统一返回 null（调用方安全）', async () => {
    mockFetch.mockRejectedValue(new Error('ECONNREFUSED'));
    expect(await makeAdapter().getBalance()).toBeNull();
    mockFetch.mockResolvedValue({
      ok: true,
      json: async () => {
        throw new Error('bad json');
      },
    } as unknown as Response);
    expect(await makeAdapter().getBalance()).toBeNull();
  });

  it('currency 保留字符串原样（不做数值转换）', async () => {
    mockFetch.mockResolvedValue(
      okResponse({ balance_infos: [{ currency: 'CNY', total_balance: '110.55' }] }),
    );
    const balance = await makeAdapter().getBalance();
    expect(balance!.currency).toBe('CNY');
    expect(typeof balance!.totalBalance).toBe('string');
  });

  it('请求 URL 不含 /v1 时余额端点不受影响（契约回归）', async () => {
    mockFetch.mockResolvedValue(okResponse({ balance_infos: [{ total_balance: '1' }] }));
    await makeAdapter('https://api.deepseek.com/v1').getBalance();
    const calledUrl = mockFetch.mock.calls[0][0] as string;
    expect(calledUrl).not.toContain('/v1');
    expect(calledUrl).toBe('https://api.deepseek.com/user/balance');
  });

  it('HTTP 429 返回 null（限流不视为余额数据）', async () => {
    mockFetch.mockResolvedValue({ ok: false, status: 429 } as unknown as Response);
    expect(await makeAdapter().getBalance()).toBeNull();
  });

  it('HTTP 500 返回 null', async () => {
    mockFetch.mockResolvedValue({ ok: false, status: 500 } as unknown as Response);
    expect(await makeAdapter().getBalance()).toBeNull();
  });

  it('HTTP 403 返回 null（鉴权失败）', async () => {
    mockFetch.mockResolvedValue({ ok: false, status: 403 } as unknown as Response);
    expect(await makeAdapter().getBalance()).toBeNull();
  });

  it('空 apiKey 时发送空 Bearer 头（v0.7.4 修正命名 —— 原"不含 Authorization"与实际断言相反）', async () => {
    mockFetch.mockResolvedValue(okResponse({ balance_infos: [{ total_balance: '1' }] }));
    await makeAdapter().getBalance();
    // 适配器配置始终携带 apiKey；此处验证 apiKey 为空串时头部仍带 'Bearer '（空值）
    const noKeyAdapter = new DeepSeekAdapter({ ...CONFIG, apiKey: '' });
    mockFetch.mockClear();
    mockFetch.mockResolvedValue(okResponse({ balance_infos: [{ total_balance: '1' }] }));
    await noKeyAdapter.getBalance();
    const [, init] = mockFetch.mock.calls[0] as [string, RequestInit];
    expect((init.headers as Record<string, string>).Authorization).toBe('Bearer ');
  });

  it('数字型 total_balance（非字符串）原样透传', async () => {
    mockFetch.mockResolvedValue(
      okResponse({ balance_infos: [{ currency: 'CNY', total_balance: 88 }] }),
    );
    const balance = await makeAdapter().getBalance();
    expect(balance!.totalBalance).toBe(88);
  });

  it('响应为空对象 → 全部默认值', async () => {
    mockFetch.mockResolvedValue(okResponse({}));
    const balance = await makeAdapter().getBalance();
    expect(balance).toEqual({
      currency: 'CNY',
      totalBalance: '0',
      grantedBalance: '0',
      toppedUpBalance: '0',
    });
  });

  it('granted_balance 缺失仅缺省为 0（不影响其余字段）', async () => {
    mockFetch.mockResolvedValue(
      okResponse({
        balance_infos: [{ currency: 'USD', total_balance: '5.0', topped_up_balance: '5.0' }],
      }),
    );
    const balance = await makeAdapter().getBalance();
    expect(balance!.grantedBalance).toBe('0');
    expect(balance!.totalBalance).toBe('5.0');
  });

  it('balance_infos 元素为 null → 回退扁平字段（防御空条目）', async () => {
    mockFetch.mockResolvedValue(
      okResponse({ balance_infos: [null], currency: 'JPY', total_balance: '1000' }),
    );
    const balance = await makeAdapter().getBalance();
    expect(balance!.currency).toBe('JPY');
    expect(balance!.totalBalance).toBe('1000');
  });

  it('多次调用互不影响（每次独立 fetch）', async () => {
    mockFetch.mockResolvedValue(okResponse({ balance_infos: [{ total_balance: '1' }] }));
    const adapter = makeAdapter();
    await adapter.getBalance();
    await adapter.getBalance();
    expect(mockFetch).toHaveBeenCalledTimes(2);
  });
});