import Toast from '@/components/base/toast';
import {
  API_PREFIX,
  APP_VERSION,
  MARKETPLACE_API_PREFIX,
  PUBLIC_API_PREFIX,
} from '@/config';
import type {
  AfterResponseHook,
  BeforeErrorHook,
  BeforeRequestHook,
  Hooks,
} from 'ky';
import ky from 'ky';

const TIME_OUT = 100000;

export const ContentType = {
  json: 'application/json',
  stream: 'text/event-stream',
  audio: 'audio/mpeg',
  form: 'application/x-www-form-urlencoded; charset=UTF-8',
  download: 'application/octet-stream', // for download
  downloadZip: 'application/zip', // for download
  upload: 'multipart/form-data', // for upload
};

export type FetchOptionType = Omit<RequestInit, 'body'> & {
  params?: Record<string, any>;
  body?: BodyInit | Record<string, any> | null;
};

const afterResponse204: AfterResponseHook = async (
  _request,
  _options,
  response,
) => {
  if (response.status === 204) return Response.json({ result: 'success' });
};

export type ResponseError = {
  code: string;
  message: string;
  status: number;
};

const afterResponseErrorCode = (
  otherOptions: IOtherOptions,
): AfterResponseHook => {
  return async (
    _request: Request,
    _options: RequestInit,
    response: Response,
  ) => {
    const clonedResponse = response.clone();
    if (!/^([23])\d{2}$/.test(String(clonedResponse.status))) {
      const bodyJson = clonedResponse.json() as Promise<ResponseError>;
      switch (clonedResponse.status) {
        case 403:
          bodyJson.then((data: ResponseError) => {
            if (!otherOptions.silent)
              Toast.notify({ type: 'error', message: data.message });
            if (data.code === 'already_setup')
              globalThis.location.href = `${globalThis.location.origin}/signin`;
          });
          break;
        case 401:
          return Promise.reject(response);
        // fall through
        default:
          bodyJson.then((data: ResponseError) => {
            if (!otherOptions.silent)
              Toast.notify({ type: 'error', message: data.message });
          });
          return Promise.reject(response);
      }
    }
  };
};

const beforeErrorToast = (otherOptions: IOtherOptions): BeforeErrorHook => {
  return (error) => {
    if (!otherOptions.silent)
      Toast.notify({ type: 'error', message: error.message });
    return error;
  };
};

export async function getAccessToken(isPublicAPI?: boolean) {
  if (isPublicAPI) {
    const sharedToken = globalThis.location.pathname.split('/').slice(-1)[0];
    const userId = (await getProcessedSystemVariablesFromUrlParams()).user_id;
    const accessToken =
      localStorage.getItem('token') || JSON.stringify({ version: 2 });
    let accessTokenJson: Record<string, any> = { version: 2 };
    try {
      accessTokenJson = JSON.parse(accessToken);
      if (isTokenV1(accessTokenJson)) accessTokenJson = getInitialTokenV2();
    } catch {}
    return accessTokenJson[sharedToken]?.[userId || 'DEFAULT'];
  } else {
    return localStorage.getItem('console_token') || '';
  }
}

const beforeRequestPublicAuthorization: BeforeRequestHook = async (request) => {
  const token = await getAccessToken(true);
  request.headers.set('Authorization', `Bearer ${token}`);
};

const beforeRequestAuthorization: BeforeRequestHook = async (request) => {
  const accessToken = await getAccessToken();
  request.headers.set('Authorization', `Bearer ${accessToken}`);
};

const baseHooks: Hooks = {
  afterResponse: [afterResponse204],
};

const baseClient = ky.create({
  hooks: baseHooks,
  timeout: TIME_OUT,
});

export const getBaseOptions = (): RequestInit => ({
  method: 'GET',
  mode: 'cors',
  credentials: 'include', // always send cookies、HTTP Basic authentication.
  headers: new Headers({
    'Content-Type': ContentType.json,
  }),
  redirect: 'follow',
});

async function base<T>(
  url: string,
  options: FetchOptionType = {},
  otherOptions: IOtherOptions = {},
): Promise<T> {
  const baseOptions = getBaseOptions();
  const { params, body, headers, ...init } = Object.assign(
    {},
    baseOptions,
    options,
  );
  const {
    isPublicAPI = false,
    isMarketplaceAPI = false,
    bodyStringify = true,
    needAllResponseContent,
    deleteContentType,
    getAbortController,
  } = otherOptions;

  let base: string;
  if (isMarketplaceAPI) base = MARKETPLACE_API_PREFIX;
  else if (isPublicAPI) base = PUBLIC_API_PREFIX;
  else base = API_PREFIX;

  if (getAbortController) {
    const abortController = new AbortController();
    getAbortController(abortController);
    options.signal = abortController.signal;
  }

  const fetchPathname = base + (url.startsWith('/') ? url : `/${url}`);

  if (deleteContentType) (headers as any).delete('Content-Type');

  // ! For Marketplace API, help to filter tags added in new version
  if (isMarketplaceAPI) (headers as any).set('X-Dify-Version', APP_VERSION);

  const client = baseClient.extend({
    hooks: {
      ...baseHooks,
      beforeError: [
        ...(baseHooks.beforeError || []),
        beforeErrorToast(otherOptions),
      ],
      beforeRequest: [
        ...(baseHooks.beforeRequest || []),
        isPublicAPI && beforeRequestPublicAuthorization,
        !isPublicAPI && !isMarketplaceAPI && beforeRequestAuthorization,
      ].filter((h): h is BeforeRequestHook => Boolean(h)),
      afterResponse: [
        ...(baseHooks.afterResponse || []),
        afterResponseErrorCode(otherOptions),
      ],
    },
  });

  const res = await client(fetchPathname, {
    ...init,
    headers,
    credentials: isMarketplaceAPI ? 'omit' : options.credentials || 'include',
    retry: {
      methods: [],
    },
    ...(bodyStringify ? { json: body } : { body: body as BodyInit }),
    searchParams: params,
    fetch(resource: RequestInfo | URL, options?: RequestInit) {
      if (resource instanceof Request && options) {
        const mergedHeaders = new Headers(options.headers || {});
        resource.headers.forEach((value, key) => {
          mergedHeaders.append(key, value);
        });
        options.headers = mergedHeaders;
      }
      return globalThis.fetch(resource, options);
    },
  });

  if (needAllResponseContent) return res as T;
  const contentType = res.headers.get('content-type');
  if (
    contentType &&
    [ContentType.download, ContentType.audio, ContentType.downloadZip].includes(
      contentType,
    )
  )
    return (await res.blob()) as T;

  return (await res.json()) as T;
}

export { base };