import { ExtractResult } from "./result";

const URL_REG = /^\s*(https?):\/\//im;

export function parseUrls(...args) {
    if (!args.length) return [];
    let arg = args.shift();
    if (arg instanceof Array) {
        return arg;
    } else if (arg instanceof ExtractResult) {
        return arg.squash().filter(v => URL_REG.test(v));
    } else {
        let urlTempl = arg;
        if (urlTempl) {
            if (args[0] instanceof Array) {
                return args[0].map(p => urlTempl.replace("${page}", p));
            } else if (args.length >= 3) {
                let urls = [];
                let from = args.shift();
                let to = args.shift();
                let interval = args.shift();
                for (let i = from; i <= to; i += interval) {
                    urls.push(urlTempl.replace("${page}", i));
                }
                return urls;
            }
        }
    }
    return [];
}

export function saveFile(data: string, mimeType: string, fileName?: string) {
    fileName = fileName || document.title || "result";
    let blob: Blob;
    if (typeof window.Blob == "function") {
        blob = new Blob([data], {
            type: mimeType
        })
    } else {
        var BlobBuiler = window.MSBlobBuilder;
        var builer = new BlobBuiler();
        builer.append(data);
        blob = builer.getBlob(mimeType)
    }
    var URL = window.URL || window.webkitURL;
    var url = URL.createObjectURL(blob);
    var link = document.createElement("a");
    if ('download' in link) {
        link.style.visibility = "hidden";
        link.href = url;
        link.download = fileName;
        document.body.appendChild(link);
        var j = document.createEvent("MouseEvents");
        j.initEvent("click", true, true);
        link.dispatchEvent(j);
        document.body.removeChild(link)
    } else if (navigator.msSaveBlob) {
        navigator.msSaveBlob(blob, fileName)
    } else {
        location.href = url
    }
}