/**
 * Copyright 2022 Gravwell, Inc. All rights reserved.
 *
 * Contact: [legal@gravwell.io](mailto:legal@gravwell.io)
 *
 * This software may be modified and distributed under the terms of the MIT
 * license. See the LICENSE file for details.
 */

import { CreatableAutoExtractor } from '~/models/auto-extractor/creatable-auto-extractor';
import { toRawCreatableAutoExtractor } from '~/models/auto-extractor/to-raw-creatable-auto-extractor';
import { APIContext } from '../utils/api-context';
import { buildHTTPRequestWithAuthFromContext } from '../utils/build-http-request';
import { buildURL } from '../utils/build-url';
import { HTTPRequestOptions } from '../utils/http-request-options';
import { parseJSONResponse } from '../utils/parse-json-response';

export const makeIsValidAutoExtractorSyntax = (
	context: APIContext,
): ((data: CreatableAutoExtractor) => Promise<IsValidAutoExtractorSyntaxResponse>) => {
	const templatePath = '/api/autoextractors/test';
	const url = buildURL(templatePath, { ...context, protocol: 'http' });

	return async (data: CreatableAutoExtractor): Promise<IsValidAutoExtractorSyntaxResponse> => {
		try {
			const baseRequestOptions: HTTPRequestOptions = {
				body: JSON.stringify(toRawCreatableAutoExtractor(data)),
				headers: { 'Content-Type': 'application/json' },
			};
			const req = buildHTTPRequestWithAuthFromContext(context, baseRequestOptions);

			const raw = await context.fetch(url, { ...req, method: 'POST' });
			const rawRes = await parseJSONResponse<RawIsValidAutoExtractorSyntaxResponse>(raw, { returnError: true });
			return toIsValidAutoExtractorSyntaxResponse(rawRes);
		} catch (err) {
			if (err instanceof Error) {
				throw err;
			}
			throw Error('Unknown error');
		}
	};
};

interface RawIsValidAutoExtractorSyntaxResponse {
	TagExists?: boolean;
	Error?: string;
}

export type IsValidAutoExtractorSyntaxResponse = { isTagInUse: boolean } & (
	| { isValidSyntax: true; syntaxErrorMessage: null }
	| { isValidSyntax: false; syntaxErrorMessage: string }
);

const toIsValidAutoExtractorSyntaxResponse = (
	raw: RawIsValidAutoExtractorSyntaxResponse,
): IsValidAutoExtractorSyntaxResponse => {
	const trimmedError = (raw.Error ?? '').trim();
	const isTagInUse = raw.TagExists ?? false;
	const isValidSyntax = trimmedError === '' && raw.TagExists === false;

	switch (isValidSyntax) {
		case true:
			return { isTagInUse, isValidSyntax: true, syntaxErrorMessage: null };
		case false:
			return { isTagInUse, isValidSyntax: false, syntaxErrorMessage: trimmedError };
	}
};