//handle all zip file actions here
import * as JSZip from "jszip";
import fs = require("fs");
import * as xml2js from "xml2js-es6-promise";

export default class ZipHandler {
	private static zip = new JSZip();
	private static zipResult: JSZip;

	public static loadZip(zipFilePath: string): Promise<Boolean> {
		return new Promise(async resolve => {
			let data = await this.readFileBuffer(zipFilePath);
			this.zipResult = await this.zip.loadAsync(data);
			resolve(true);
		});
	}

	public static async parseSlideAttributes(fileName) {
		let presentationSlide = await this.zipResult.file(fileName).async("text");
		let parsedPresentationSlide = await xml2js(presentationSlide, { trim: true, preserveChildrenOrderForMixedContent: true });

		return parsedPresentationSlide;
	}

	public static async getFileInZip(fileName) {
		let file = await this.zipResult.file(fileName).async("base64");
		return file;
	}

	public static readFileBuffer(filePath): Promise<Buffer> {
		return new Promise(function(resolve, reject) {
			fs.readFile(filePath, (err, data) => {
				err ? reject(err) : resolve(data);
			});
		});
	}
}