/* eslint-disable no-plusplus */
/* eslint-disable prefer-template */
/* eslint-disable prefer-arrow-callback */
/* eslint-disable no-var */
/* eslint-disable vars-on-top */
/* eslint-disable no-param-reassign */
/* eslint-disable import/no-extraneous-dependencies */
/**
 * This is copied from @vespaiach/axios-fetch-adapter, which exposes an ESM
 * module without setting the "type" field in package.json.
 */
import axios from "axios";
import { EventStreamContentType, getLines, getBytes, getMessages, } from "./event-source-parse.js";
function tryJsonStringify(data) {
    try {
        return JSON.stringify(data);
    }
    catch (e) {
        return data;
    }
}
/**
 * In order to avoid import issues with axios 1.x, copying here the internal
 * utility functions that we used to import directly from axios.
 */
// Copied from axios/lib/core/settle.js
function settle(resolve, reject, response) {
    const { validateStatus } = response.config;
    if (!response.status || !validateStatus || validateStatus(response.status)) {
        resolve(response);
    }
    else {
        reject(createError(`Request failed with status code ${response.status} and body ${typeof response.data === "string"
            ? response.data
            : tryJsonStringify(response.data)}`, response.config, null, response.request, response));
    }
}
// Copied from axios/lib/helpers/isAbsoluteURL.js
function isAbsoluteURL(url) {
    // A URL is considered absolute if it begins with "<scheme>://" or "//" (protocol-relative URL).
    // RFC 3986 defines scheme name as a sequence of characters beginning with a letter and followed
    // by any combination of letters, digits, plus, period, or hyphen.
    return /^([a-z][a-z\d+\-.]*:)?\/\//i.test(url);
}
// Copied from axios/lib/helpers/combineURLs.js
function combineURLs(baseURL, relativeURL) {
    return relativeURL
        ? baseURL.replace(/\/+$/, "") + "/" + relativeURL.replace(/^\/+/, "")
        : baseURL;
}
// Copied from axios/lib/helpers/buildURL.js
function encode(val) {
    return encodeURIComponent(val)
        .replace(/%3A/gi, ":")
        .replace(/%24/g, "$")
        .replace(/%2C/gi, ",")
        .replace(/%20/g, "+")
        .replace(/%5B/gi, "[")
        .replace(/%5D/gi, "]");
}
function buildURL(url, params, paramsSerializer) {
    if (!params) {
        return url;
    }
    var serializedParams;
    if (paramsSerializer) {
        serializedParams = paramsSerializer(params);
    }
    else if (isURLSearchParams(params)) {
        serializedParams = params.toString();
    }
    else {
        var parts = [];
        forEach(params, function serialize(val, key) {
            if (val === null || typeof val === "undefined") {
                return;
            }
            if (isArray(val)) {
                key = `${key}[]`;
            }
            else {
                val = [val];
            }
            forEach(val, function parseValue(v) {
                if (isDate(v)) {
                    v = v.toISOString();
                }
                else if (isObject(v)) {
                    v = JSON.stringify(v);
                }
                parts.push(`${encode(key)}=${encode(v)}`);
            });
        });
        serializedParams = parts.join("&");
    }
    if (serializedParams) {
        var hashmarkIndex = url.indexOf("#");
        if (hashmarkIndex !== -1) {
            url = url.slice(0, hashmarkIndex);
        }
        url += (url.indexOf("?") === -1 ? "?" : "&") + serializedParams;
    }
    return url;
}
// Copied from axios/lib/core/buildFullPath.js
function buildFullPath(baseURL, requestedURL) {
    if (baseURL && !isAbsoluteURL(requestedURL)) {
        return combineURLs(baseURL, requestedURL);
    }
    return requestedURL;
}
// Copied from axios/lib/utils.js
function isUndefined(val) {
    return typeof val === "undefined";
}
function isObject(val) {
    return val !== null && typeof val === "object";
}
function isDate(val) {
    return toString.call(val) === "[object Date]";
}
function isURLSearchParams(val) {
    return toString.call(val) === "[object URLSearchParams]";
}
function isArray(val) {
    return Array.isArray(val);
}
function forEach(obj, fn) {
    // Don't bother if no value provided
    if (obj === null || typeof obj === "undefined") {
        return;
    }
    // Force an array if not already something iterable
    if (typeof obj !== "object") {
        obj = [obj];
    }
    if (isArray(obj)) {
        // Iterate over array values
        for (var i = 0, l = obj.length; i < l; i++) {
            fn.call(null, obj[i], i, obj);
        }
    }
    else {
        // Iterate over object keys
        for (var key in obj) {
            if (Object.prototype.hasOwnProperty.call(obj, key)) {
                fn.call(null, obj[key], key, obj);
            }
        }
    }
}
function isFormData(val) {
    return toString.call(val) === "[object FormData]";
}
// TODO this needs to be fixed to run in newer browser-like environments
// https://github.com/vespaiach/axios-fetch-adapter/issues/20#issue-1396365322
function isStandardBrowserEnv() {
    if (typeof navigator !== "undefined" &&
        // eslint-disable-next-line no-undef
        (navigator.product === "ReactNative" ||
            // eslint-disable-next-line no-undef
            navigator.product === "NativeScript" ||
            // eslint-disable-next-line no-undef
            navigator.product === "NS")) {
        return false;
    }
    return typeof window !== "undefined" && typeof document !== "undefined";
}
/**
 * - Create a request object
 * - Get response body
 * - Check if timeout
 */
export default async function fetchAdapter(config) {
    const request = createRequest(config);
    const data = await getResponse(request, config);
    return new Promise((resolve, reject) => {
        if (data instanceof Error) {
            reject(data);
        }
        else {
            // eslint-disable-next-line no-unused-expressions
            Object.prototype.toString.call(config.settle) === "[object Function]"
                ? config.settle(resolve, reject, data)
                : settle(resolve, reject, data);
        }
    });
}
/**
 * Fetch API stage two is to get response body. This funtion tries to retrieve
 * response body based on response's type
 */
async function getResponse(request, config) {
    let stageOne;
    try {
        stageOne = await fetch(request);
    }
    catch (e) {
        if (e && e.name === "AbortError") {
            return createError("Request aborted", config, "ECONNABORTED", request);
        }
        if (e && e.name === "TimeoutError") {
            return createError("Request timeout", config, "ECONNABORTED", request);
        }
        return createError("Network Error", config, "ERR_NETWORK", request);
    }
    const headers = {};
    stageOne.headers.forEach((value, key) => {
        headers[key] = value;
    });
    const response = {
        ok: stageOne.ok,
        status: stageOne.status,
        statusText: stageOne.statusText,
        headers,
        config,
        request,
    };
    if (stageOne.status >= 200 && stageOne.status !== 204) {
        if (config.responseType === "stream") {
            const contentType = stageOne.headers.get("content-type");
            if (!contentType?.startsWith(EventStreamContentType)) {
                // If the content-type is not stream, response is most likely an error
                if (stageOne.status >= 400) {
                    // If the error is a JSON, parse it. Otherwise, return as text
                    if (contentType?.startsWith("application/json")) {
                        response.data = await stageOne.json();
                        return response;
                    }
                    else {
                        response.data = await stageOne.text();
                        return response;
                    }
                }
                // If the non-stream response is also not an error, throw
                throw new Error(`Expected content-type to be ${EventStreamContentType}, Actual: ${contentType}`);
            }
            await getBytes(stageOne.body, getLines(getMessages(config.onmessage)));
        }
        else {
            switch (config.responseType) {
                case "arraybuffer":
                    response.data = await stageOne.arrayBuffer();
                    break;
                case "blob":
                    response.data = await stageOne.blob();
                    break;
                case "json":
                    response.data = await stageOne.json();
                    break;
                case "formData":
                    response.data = await stageOne.formData();
                    break;
                default:
                    response.data = await stageOne.text();
                    break;
            }
        }
    }
    return response;
}
/**
 * This function will create a Request object based on configuration's axios
 */
function createRequest(config) {
    const headers = new Headers(config.headers);
    // HTTP basic authentication
    if (config.auth) {
        const username = config.auth.username || "";
        const password = config.auth.password
            ? decodeURI(encodeURIComponent(config.auth.password))
            : "";
        headers.set("Authorization", `Basic ${btoa(`${username}:${password}`)}`);
    }
    const method = config.method.toUpperCase();
    const options = {
        headers,
        method,
    };
    if (method !== "GET" && method !== "HEAD") {
        options.body = config.data;
        // In these cases the browser will automatically set the correct Content-Type,
        // but only if that header hasn't been set yet. So that's why we're deleting it.
        if (isFormData(options.body) && isStandardBrowserEnv()) {
            headers.delete("Content-Type");
        }
    }
    // Some `fetch` implementations will override the Content-Type to text/plain
    // when body is a string.
    // See https://github.com/langchain-ai/langchainjs/issues/1010
    if (typeof options.body === "string") {
        options.body = new TextEncoder().encode(options.body);
    }
    if (config.mode) {
        options.mode = config.mode;
    }
    if (config.cache) {
        options.cache = config.cache;
    }
    if (config.integrity) {
        options.integrity = config.integrity;
    }
    if (config.redirect) {
        options.redirect = config.redirect;
    }
    if (config.referrer) {
        options.referrer = config.referrer;
    }
    if (config.timeout && config.timeout > 0) {
        options.signal = AbortSignal.timeout(config.timeout);
    }
    if (config.signal) {
        // this overrides the timeout signal if both are set
        options.signal = config.signal;
    }
    // This config is similar to XHR’s withCredentials flag, but with three available values instead of two.
    // So if withCredentials is not set, default value 'same-origin' will be used
    if (!isUndefined(config.withCredentials)) {
        options.credentials = config.withCredentials ? "include" : "omit";
    }
    // for streaming
    if (config.responseType === "stream") {
        options.headers.set("Accept", EventStreamContentType);
    }
    const fullPath = buildFullPath(config.baseURL, config.url);
    const url = buildURL(fullPath, config.params, config.paramsSerializer);
    // Expected browser to throw error if there is any wrong configuration value
    return new Request(url, options);
}
/**
 * Note:
 *
 *   From version >= 0.27.0, createError function is replaced by AxiosError class.
 *   So I copy the old createError function here for backward compatible.
 *
 *
 *
 * Create an Error with the specified message, config, error code, request and response.
 *
 * @param {string} message The error message.
 * @param {Object} config The config.
 * @param {string} [code] The error code (for example, 'ECONNABORTED').
 * @param {Object} [request] The request.
 * @param {Object} [response] The response.
 * @returns {Error} The created error.
 */
function createError(message, config, code, request, response) {
    if (axios.AxiosError && typeof axios.AxiosError === "function") {
        return new axios.AxiosError(message, axios.AxiosError[code], config, request, response);
    }
    const error = new Error(message);
    return enhanceError(error, config, code, request, response);
}
/**
 *
 * Note:
 *
 *   This function is for backward compatible.
 *
 *
 * Update an Error with the specified config, error code, and response.
 *
 * @param {Error} error The error to update.
 * @param {Object} config The config.
 * @param {string} [code] The error code (for example, 'ECONNABORTED').
 * @param {Object} [request] The request.
 * @param {Object} [response] The response.
 * @returns {Error} The error.
 */
function enhanceError(error, config, code, request, response) {
    error.config = config;
    if (code) {
        error.code = code;
    }
    error.request = request;
    error.response = response;
    error.isAxiosError = true;
    error.toJSON = function toJSON() {
        return {
            // Standard
            message: this.message,
            name: this.name,
            // Microsoft
            description: this.description,
            number: this.number,
            // Mozilla
            fileName: this.fileName,
            lineNumber: this.lineNumber,
            columnNumber: this.columnNumber,
            stack: this.stack,
            // Axios
            config: this.config,
            code: this.code,
            status: this.response && this.response.status ? this.response.status : null,
        };
    };
    return error;
}