// This file is auto-generated by @hey-api/openapi-ts

import { getAuthToken } from "../core/auth.gen.ts";
import type { QuerySerializerOptions } from "../core/bodySerializer.gen.ts";
import { jsonBodySerializer } from "../core/bodySerializer.gen.ts";
import {
  serializeArrayParam,
  serializeObjectParam,
  serializePrimitiveParam,
} from "../core/pathSerializer.gen.ts";
import { getUrl } from "../core/utils.gen.ts";
import type {
  Client,
  ClientOptions,
  Config,
  RequestOptions,
} from "./types.gen.ts";

export const createQuerySerializer = <T = unknown>({
  allowReserved,
  array,
  object,
}: QuerySerializerOptions = {}) => {
  const querySerializer = (queryParams: T) => {
    const search: string[] = [];
    if (queryParams && typeof queryParams === "object") {
      for (const name in queryParams) {
        const value = queryParams[name];

        if (value === undefined || value === null) {
          continue;
        }

        if (Array.isArray(value)) {
          const serializedArray = serializeArrayParam({
            allowReserved,
            explode: true,
            name,
            style: "form",
            value,
            ...array,
          });
          if (serializedArray) search.push(serializedArray);
        } else if (typeof value === "object") {
          const serializedObject = serializeObjectParam({
            allowReserved,
            explode: true,
            name,
            style: "deepObject",
            value: value as Record<string, unknown>,
            ...object,
          });
          if (serializedObject) search.push(serializedObject);
        } else {
          const serializedPrimitive = serializePrimitiveParam({
            allowReserved,
            name,
            value: value as string,
          });
          if (serializedPrimitive) search.push(serializedPrimitive);
        }
      }
    }
    return search.join("&");
  };
  return querySerializer;
};

/**
 * Infers parseAs value from provided Content-Type header.
 */
export const getParseAs = (
  contentType: string | null,
): Exclude<Config["parseAs"], "auto"> => {
  if (!contentType) {
    // If no Content-Type header is provided, the best we can do is return the raw response body,
    // which is effectively the same as the 'stream' option.
    return "stream";
  }

  const cleanContent = contentType.split(";")[0]?.trim();

  if (!cleanContent) {
    return;
  }

  if (
    cleanContent.startsWith("application/json") ||
    cleanContent.endsWith("+json")
  ) {
    return "json";
  }

  if (cleanContent === "multipart/form-data") {
    return "formData";
  }

  if (
    ["application/", "audio/", "image/", "video/"].some((type) =>
      cleanContent.startsWith(type),
    )
  ) {
    return "blob";
  }

  if (cleanContent.startsWith("text/")) {
    return "text";
  }

  return;
};

const checkForExistence = (
  options: Pick<RequestOptions, "auth" | "query"> & {
    headers: Headers;
  },
  name?: string,
): boolean => {
  if (!name) {
    return false;
  }
  if (
    options.headers.has(name) ||
    options.query?.[name] ||
    options.headers.get("Cookie")?.includes(`${name}=`)
  ) {
    return true;
  }
  return false;
};

export const setAuthParams = async ({
  security,
  ...options
}: Pick<Required<RequestOptions>, "security"> &
  Pick<RequestOptions, "auth" | "query"> & {
    headers: Headers;
  }) => {
  for (const auth of security) {
    if (checkForExistence(options, auth.name)) {
      continue;
    }

    const token = await getAuthToken(auth, options.auth);

    if (!token) {
      continue;
    }

    const name = auth.name ?? "Authorization";

    switch (auth.in) {
      case "query":
        if (!options.query) {
          options.query = {};
        }
        options.query[name] = token;
        break;
      case "cookie":
        options.headers.append("Cookie", `${name}=${token}`);
        break;
      case "header":
      default:
        options.headers.set(name, token);
        break;
    }
  }
};

export const buildUrl: Client["buildUrl"] = (options) =>
  getUrl({
    baseUrl: options.baseUrl as string,
    path: options.path,
    query: options.query,
    querySerializer:
      typeof options.querySerializer === "function"
        ? options.querySerializer
        : createQuerySerializer(options.querySerializer),
    url: options.url,
  });

export const mergeConfigs = (a: Config, b: Config): Config => {
  const config = { ...a, ...b };
  if (config.baseUrl?.endsWith("/")) {
    config.baseUrl = config.baseUrl.substring(0, config.baseUrl.length - 1);
  }
  config.headers = mergeHeaders(a.headers, b.headers);
  return config;
};

const headersEntries = (headers: Headers): Array<[string, string]> => {
  const entries: Array<[string, string]> = [];
  headers.forEach((value, key) => {
    entries.push([key, value]);
  });
  return entries;
};

export const mergeHeaders = (
  ...headers: Array<Required<Config>["headers"] | undefined>
): Headers => {
  const mergedHeaders = new Headers();
  for (const header of headers) {
    if (!header) {
      continue;
    }

    const iterator =
      header instanceof Headers
        ? headersEntries(header)
        : Object.entries(header);

    for (const [key, value] of iterator) {
      if (value === null) {
        mergedHeaders.delete(key);
      } else if (Array.isArray(value)) {
        for (const v of value) {
          mergedHeaders.append(key, v as string);
        }
      } else if (value !== undefined) {
        // assume object headers are meant to be JSON stringified, i.e. their
        // content value in OpenAPI specification is 'application/json'
        mergedHeaders.set(
          key,
          typeof value === "object" ? JSON.stringify(value) : (value as string),
        );
      }
    }
  }
  return mergedHeaders;
};

type ErrInterceptor<Err, Res, Req, Options> = (
  error: Err,
  response: Res,
  request: Req,
  options: Options,
) => Err | Promise<Err>;

type ReqInterceptor<Req, Options> = (
  request: Req,
  options: Options,
) => Req | Promise<Req>;

type ResInterceptor<Res, Req, Options> = (
  response: Res,
  request: Req,
  options: Options,
) => Res | Promise<Res>;

class Interceptors<Interceptor> {
  fns: Array<Interceptor | null> = [];

  clear(): void {
    this.fns = [];
  }

  eject(id: number | Interceptor): void {
    const index = this.getInterceptorIndex(id);
    if (this.fns[index]) {
      this.fns[index] = null;
    }
  }

  exists(id: number | Interceptor): boolean {
    const index = this.getInterceptorIndex(id);
    return Boolean(this.fns[index]);
  }

  getInterceptorIndex(id: number | Interceptor): number {
    if (typeof id === "number") {
      return this.fns[id] ? id : -1;
    }
    return this.fns.indexOf(id);
  }

  update(
    id: number | Interceptor,
    fn: Interceptor,
  ): number | Interceptor | false {
    const index = this.getInterceptorIndex(id);
    if (this.fns[index]) {
      this.fns[index] = fn;
      return id;
    }
    return false;
  }

  use(fn: Interceptor): number {
    this.fns.push(fn);
    return this.fns.length - 1;
  }
}

export interface Middleware<Req, Res, Err, Options> {
  error: Interceptors<ErrInterceptor<Err, Res, Req, Options>>;
  request: Interceptors<ReqInterceptor<Req, Options>>;
  response: Interceptors<ResInterceptor<Res, Req, Options>>;
}

export const createInterceptors = <Req, Res, Err, Options>(): Middleware<
  Req,
  Res,
  Err,
  Options
> => ({
  error: new Interceptors<ErrInterceptor<Err, Res, Req, Options>>(),
  request: new Interceptors<ReqInterceptor<Req, Options>>(),
  response: new Interceptors<ResInterceptor<Res, Req, Options>>(),
});

const defaultQuerySerializer = createQuerySerializer({
  allowReserved: false,
  array: {
    explode: true,
    style: "form",
  },
  object: {
    explode: true,
    style: "deepObject",
  },
});

const defaultHeaders = {
  "Content-Type": "application/json",
};

export const createConfig = <T extends ClientOptions = ClientOptions>(
  override: Config<Omit<ClientOptions, keyof T> & T> = {},
): Config<Omit<ClientOptions, keyof T> & T> => ({
  ...jsonBodySerializer,
  headers: defaultHeaders,
  parseAs: "auto",
  querySerializer: defaultQuerySerializer,
  ...override,
});