import { AiConfig } from '@n8n/config';
import { Container } from '@n8n/di';
import axios from 'axios';
import type { InternalAxiosRequestConfig } from 'axios';
import { stringify } from 'qs';

import { setAxiosAgents } from './utils';

let configured = false;

/**
 * Applies n8n's global axios defaults.
 * These are process-wide side effects.
 * Calling it more than once is a no-op.
 */
export function configureGlobalAxiosDefaults(): void {
	if (!configured) {
		configured = true;

		// Global axios defaults

		axios.defaults.timeout = 300000;
		// Prevent axios from adding x-form-www-urlencoded headers by default
		axios.defaults.headers.post = {};
		axios.defaults.headers.put = {};
		axios.defaults.headers.patch = {};
		axios.defaults.paramsSerializer = (params) => {
			if (params instanceof URLSearchParams) {
				return params.toString();
			}
			return stringify(params, { arrayFormat: 'indices' });
		};
		// Disable axios proxy, we handle it ourselves
		// Axios proxy option has problems: https://github.com/axios/axios/issues/4531
		axios.defaults.proxy = false;

		// Interceptor
		axios.interceptors.request.use((config) => {
			// If no content-type is set by us, prevent axios from force-setting the content-type to `application/x-www-form-urlencoded`
			if (config.data === undefined) {
				config.headers.setContentType(false, false);
			}

			setAxiosAgents(config);
			applyVendorHeaders(config);

			return config;
		});
	}
}

function applyVendorHeaders(config: InternalAxiosRequestConfig) {
	if ([config.url, config.baseURL].some((url) => url?.startsWith('https://api.openai.com/'))) {
		config.headers.set(Container.get(AiConfig).openAiDefaultHeaders, false);
	}
}