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

import {
  AUTH_STATE_EVENT,
  ApiClientError,
  clearStoredAccessToken,
  fetchWithApiAuth,
  getStoredAccessToken,
  isTimeoutError,
  requestJson,
  setStoredAccessToken,
} from './apiClient';

function createLocalStorageMock() {
  const store = new Map<string, string>();

  return {
    getItem(key: string) {
      return store.has(key) ? store.get(key)! : null;
    },
    setItem(key: string, value: string) {
      store.set(key, String(value));
    },
    removeItem(key: string) {
      store.delete(key);
    },
    clear() {
      store.clear();
    },
  };
}

function createResponseMock(params: {
  status: number;
  body?: string;
  headers?: Record<string, string>;
}) {
  const headers = new Map(
    Object.entries(params.headers ?? {}).map(([key, value]) => [
      key.toLowerCase(),
      value,
    ]),
  );

  return {
    status: params.status,
    ok: params.status >= 200 && params.status < 300,
    headers: {
      get(name: string) {
        return headers.get(name.toLowerCase()) ?? null;
      },
    },
    text: vi.fn(async () => params.body ?? ''),
  };
}

describe('apiClient', () => {
  const fetchMock = vi.fn();
  const dispatchEventMock = vi.fn();

  beforeEach(() => {
    vi.stubGlobal('fetch', fetchMock);
    vi.stubGlobal('window', {
      dispatchEvent: dispatchEventMock,
      localStorage: createLocalStorageMock(),
    });
    fetchMock.mockReset();
    dispatchEventMock.mockReset();
    clearStoredAccessToken({ emit: false });
  });

  it('refreshes bearer token once and retries the original request', async () => {
    setStoredAccessToken('expired-token', { emit: false });
    fetchMock
      .mockResolvedValueOnce(createResponseMock({ status: 401 }))
      .mockResolvedValueOnce(
        createResponseMock({
          status: 200,
          body: JSON.stringify({
            ok: true,
            data: {
              ok: true,
              token: 'fresh-token',
            },
            error: null,
            meta: {
              apiVersion: '2026-04-08',
            },
          }),
        }),
      )
      .mockResolvedValueOnce(
        createResponseMock({
          status: 200,
          body: JSON.stringify({
            ok: true,
            data: {
              value: 7,
            },
            error: null,
            meta: {
              apiVersion: '2026-04-08',
            },
          }),
        }),
      );

    const result = await requestJson<{ value: number }>(
      '/api/runtime/protected',
      { method: 'GET' },
      '读取受保护数据失败',
    );

    expect(result).toEqual({ value: 7 });
    expect(fetchMock).toHaveBeenCalledTimes(3);
    expect(fetchMock).toHaveBeenNthCalledWith(
      1,
      '/api/runtime/protected',
      expect.objectContaining({
        credentials: 'same-origin',
        headers: expect.objectContaining({
          Authorization: 'Bearer expired-token',
          'x-genarrative-response-envelope': 'v1',
        }),
      }),
    );
    expect(fetchMock).toHaveBeenNthCalledWith(
      2,
      '/api/auth/refresh',
      expect.objectContaining({
        method: 'POST',
        credentials: 'same-origin',
      }),
    );
    expect(fetchMock).toHaveBeenNthCalledWith(
      3,
      '/api/runtime/protected',
      expect.objectContaining({
        credentials: 'same-origin',
        headers: expect.objectContaining({
          Authorization: 'Bearer fresh-token',
        }),
      }),
    );
    expect(dispatchEventMock).not.toHaveBeenCalled();
    expect(getStoredAccessToken()).toBe('fresh-token');
  });

  it('hydrates a missing local bearer token before the first protected request', async () => {
    fetchMock
      .mockResolvedValueOnce(
        createResponseMock({
          status: 200,
          body: JSON.stringify({
            ok: true,
            data: {
              ok: true,
              token: 'fresh-token',
            },
            error: null,
            meta: {
              apiVersion: '2026-04-08',
            },
          }),
        }),
      )
      .mockResolvedValueOnce(
        createResponseMock({
          status: 200,
          body: JSON.stringify({
            ok: true,
            data: {
              value: 9,
            },
            error: null,
            meta: {
              apiVersion: '2026-04-08',
            },
          }),
        }),
      );

    const result = await requestJson<{ value: number }>(
      '/api/runtime/protected',
      { method: 'GET' },
      '读取受保护数据失败',
    );

    expect(result).toEqual({ value: 9 });
    expect(fetchMock).toHaveBeenCalledTimes(2);
    expect(fetchMock).toHaveBeenNthCalledWith(
      1,
      '/api/auth/refresh',
      expect.objectContaining({
        method: 'POST',
        credentials: 'same-origin',
      }),
    );
    expect(fetchMock).toHaveBeenNthCalledWith(
      2,
      '/api/runtime/protected',
      expect.objectContaining({
        headers: expect.objectContaining({
          Authorization: 'Bearer fresh-token',
        }),
      }),
    );
    expect(getStoredAccessToken()).toBe('fresh-token');
  });

  it('does not emit auth change events when 401 probe requests opt into silent mode', async () => {
    fetchMock.mockResolvedValueOnce(createResponseMock({ status: 401 }));

    const response = await fetchWithApiAuth(
      '/api/auth/me',
      {
        method: 'GET',
      },
      {
        notifyAuthStateChange: false,
        skipRefresh: true,
      },
    );

    expect(response.status).toBe(401);
    expect(fetchMock).toHaveBeenCalledTimes(1);
    expect(dispatchEventMock).not.toHaveBeenCalled();
  });

  it('emits auth change events when refresh fails on protected requests', async () => {
    setStoredAccessToken('expired-token', { emit: false });
    fetchMock
      .mockResolvedValueOnce(createResponseMock({ status: 401 }))
      .mockResolvedValueOnce(createResponseMock({ status: 401 }));

    const response = await fetchWithApiAuth('/api/runtime/protected', {
      method: 'GET',
    });

    expect(response.status).toBe(401);
    expect(fetchMock).toHaveBeenCalledTimes(2);
    expect(dispatchEventMock).toHaveBeenCalledTimes(1);
    expect(getStoredAccessToken()).toBe('');
  });

  it('keeps the refreshed token when the retried protected request is still unauthorized', async () => {
    setStoredAccessToken('expired-token', { emit: false });
    fetchMock
      .mockResolvedValueOnce(createResponseMock({ status: 401 }))
      .mockResolvedValueOnce(
        createResponseMock({
          status: 200,
          body: JSON.stringify({
            ok: true,
            data: {
              ok: true,
              token: 'fresh-token',
            },
            error: null,
            meta: {
              apiVersion: '2026-04-08',
            },
          }),
        }),
      )
      .mockResolvedValueOnce(createResponseMock({ status: 401 }));

    const response = await fetchWithApiAuth('/api/runtime/puzzle/works', {
      method: 'GET',
    });

    expect(response.status).toBe(401);
    expect(fetchMock).toHaveBeenCalledTimes(3);
    expect(getStoredAccessToken()).toBe('fresh-token');
    expect(dispatchEventMock).not.toHaveBeenCalled();
  });

  it('rejects refresh responses that do not return a renewed bearer token', async () => {
    setStoredAccessToken('expired-token', { emit: false });
    fetchMock
      .mockResolvedValueOnce(createResponseMock({ status: 401 }))
      .mockResolvedValueOnce(
        createResponseMock({
          status: 200,
          body: JSON.stringify({
            ok: true,
            data: {
              ok: true,
            },
            error: null,
            meta: {
              apiVersion: '2026-04-08',
            },
          }),
        }),
      );

    await expect(
      requestJson<{ value: number }>(
        '/api/runtime/protected',
        { method: 'GET' },
        '读取受保护数据失败',
      ),
    ).rejects.toMatchObject({
      status: 401,
      message: '读取受保护数据失败',
    });
    expect(fetchMock).toHaveBeenCalledTimes(2);
    expect(getStoredAccessToken()).toBe('');
    expect(dispatchEventMock).toHaveBeenCalledTimes(1);
  });

  it('keeps the current access token when a public request explicitly skips auth', async () => {
    setStoredAccessToken('still-valid-token');
    vi.mocked(window.dispatchEvent).mockClear();
    fetchMock.mockResolvedValueOnce(createResponseMock({ status: 401 }));

    const response = await fetchWithApiAuth(
      '/api/runtime/custom-world-gallery',
      { method: 'GET' },
      {
        skipAuth: true,
        skipRefresh: true,
      },
    );

    expect(response.status).toBe(401);
    expect(fetchMock).toHaveBeenCalledTimes(1);
    expect(fetchMock).toHaveBeenCalledWith(
      '/api/runtime/custom-world-gallery',
      expect.objectContaining({
        headers: expect.not.objectContaining({
          Authorization: expect.any(String),
        }),
      }),
    );
    expect(getStoredAccessToken()).toBe('still-valid-token');
    expect(window.dispatchEvent).not.toHaveBeenCalled();
  });

  it('retries transient get requests before unwrapping the response envelope', async () => {
    fetchMock
      .mockRejectedValueOnce(new TypeError('network unavailable'))
      .mockResolvedValueOnce(
        createResponseMock({
          status: 200,
          body: JSON.stringify({
            ok: true,
            data: {
              value: 42,
            },
            error: null,
            meta: {
              apiVersion: '2026-04-08',
            },
          }),
          headers: {
            'Content-Type': 'application/json',
          },
        }),
      );

    const result = await requestJson<{ value: number }>(
      '/api/runtime/settings',
      { method: 'GET' },
      '读取设置失败',
    );

    expect(fetchMock).toHaveBeenCalledTimes(2);
    expect(result).toEqual({ value: 42 });
  });

  it('aborts requests when timeoutMs is reached', async () => {
    setStoredAccessToken('timeout-token', { emit: false });
    fetchMock.mockImplementation(
      async (_input: string, init?: RequestInit) =>
        new Promise((_resolve, reject) => {
          init?.signal?.addEventListener(
            'abort',
            () => {
              reject(init.signal?.reason);
            },
            { once: true },
          );
        }),
    );

    let capturedError: unknown;
    try {
      await requestJson(
        '/api/runtime/protected',
        { method: 'POST' },
        '创建会话失败',
        {
          timeoutMs: 20,
          skipRefresh: true,
        },
      );
    } catch (error) {
      capturedError = error;
    }

    expect(fetchMock).toHaveBeenCalledTimes(1);
    expect(isTimeoutError(capturedError)).toBe(true);
    expect(capturedError).toBeInstanceOf(Error);
  });

  it('surfaces response metadata through ApiClientError', async () => {
    setStoredAccessToken('metadata-token', { emit: false });
    fetchMock.mockResolvedValueOnce(
      createResponseMock({
        status: 503,
        body: JSON.stringify({
          ok: false,
          data: null,
          error: {
            code: 'UPSTREAM_ERROR',
            message: '上游暂不可用',
            details: {
              scope: 'runtime',
            },
          },
          meta: {
            apiVersion: '2026-04-08',
            requestId: 'req-body',
          },
        }),
        headers: {
          'Content-Type': 'application/json',
          'x-request-id': 'req-header',
          'x-route-version': 'runtime.v2',
        },
      }),
    );

    let capturedError: unknown;
    try {
      await requestJson(
        '/api/runtime/story/initial',
        { method: 'POST' },
        '剧情生成失败',
      );
    } catch (error) {
      capturedError = error;
    }

    expect(capturedError).toBeInstanceOf(ApiClientError);
    expect(capturedError).toMatchObject({
      status: 503,
      code: 'UPSTREAM_ERROR',
      details: {
        scope: 'runtime',
      },
      meta: {
        requestId: 'req-body',
        routeVersion: 'runtime.v2',
      },
    });
  });
});