import findVersions = require('find-versions');
import * as _ from 'lodash';
import { DoxityDocObj, S3FileObject, TypeDocNode, VersionToFileName } from 'ts/types';
import { utils } from 'ts/utils/utils';
import convert = require('xml-js');

export const docUtils = {
	async getVersionToFileNameAsync(s3DocJsonRoot: string): Promise<VersionToFileName> {
		const versionFileNames = await this.getVersionFileNamesAsync(s3DocJsonRoot);
		const versionToFileName: VersionToFileName = {};
		_.each(versionFileNames, fileName => {
			const [version] = findVersions(fileName);
			versionToFileName[version] = fileName;
		});
		return versionToFileName;
	},
	async getVersionFileNamesAsync(s3DocJsonRoot: string): Promise<string[]> {
		const response = await fetch(s3DocJsonRoot);
		if (response.status !== 200) {
			// TODO: Show the user an error message when the docs fail to load
			const errMsg = await response.text();
			utils.consoleLog(`Failed to load JSON file list: ${response.status} ${errMsg}`);
			throw new Error(errMsg);
		}
		const responseXML = await response.text();
		const responseJSONString = convert.xml2json(responseXML, {
			compact: true,
		});
		const responseObj = JSON.parse(responseJSONString);
		const fileObjs: S3FileObject[] = _.isArray(responseObj.ListBucketResult.Contents)
			? (responseObj.ListBucketResult.Contents as S3FileObject[])
			: [responseObj.ListBucketResult.Contents];

		const versionFileNames = _.map(fileObjs, fileObj => {
			return fileObj.Key._text;
		});
		return versionFileNames;
	},
	async getJSONDocFileAsync(fileName: string, s3DocJsonRoot: string): Promise<TypeDocNode | DoxityDocObj> {
		const endpoint = `${s3DocJsonRoot}/${fileName}`;
		const response = await fetch(endpoint);
		if (response.status !== 200) {
			// TODO: Show the user an error message when the docs fail to load
			const errMsg = await response.text();
			utils.consoleLog(`Failed to load Doc JSON: ${response.status} ${errMsg}`);
			throw new Error(errMsg);
		}
		const jsonDocObj = await response.json();
		return jsonDocObj;
	},
};