import fetch from "node-fetch";
import readline from "readline";

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
})

rl.question(`Random Wikipedia article or input query? (R) (I)`, c => {
    if (c == "R") {
        getRandomTitle();
        rl.close()
    }
    else if (c == "I") {
        rl.question(`Please input a wikipedia article.`, c2 => {
            findPath(c2);
            rl.close()
        })
    }
})

function getRandomTitle() {
    fetch("https://en.wikipedia.org/w/api.php?action=query&list=random&format=json&rnnamespace=0&rnlimit=1")
        .then(function (response) { return response.json(); })
        .then(function (response) {
            var t = response.query.random[0].title;
            findPath(t);
        })
}
function findPath(query) {
    var cur = query;
    console.log(cur);

    doDoom(makeUrl(cur));



    function doDoom(url) {
        fetch(url)
            .then(function (response) { return response.json(); })
            .then(function (response) {

                var pages = response.query.pages[Object.keys(response.query.pages)[0]].revisions[0]['*'];
                var t = pages.toLowerCase();

                var str = t
                var indices = [];
                for (var i = 0; i < str.length; i++) {
                    if (str[i] === "[") indices.push(i);
                }

                if (cur.includes(" ")) {
                    pages = pages.substring(t.substring(0, t.indexOf("'''" + cur.toLowerCase().substring(0, cur.indexOf(" ")))).lastIndexOf("\n"));
                }
                else {
                    pages = pages.substring(t.substring(0, t.indexOf("'''" + cur.toLowerCase())).lastIndexOf("\n"));
                }

                pages = removePar(pages);

                while (pages.substring(pages.indexOf("[[") + 2, pages.indexOf("[[") + 2 + 5) == "File:") {
                    pages = pages.substring(pages.indexOf("]]") + 2);
                }
                pages = pages.substring(pages.indexOf("[[") + 2, pages.indexOf("]]"));

                if (pages.includes("|")) {
                    pages = pages.substring(0, pages.indexOf("|"));
                }
                if (pages.includes("#")) {
                    if (pages.indexOf("#") == 0) {
                        pages = pages.substring(pages.indexOf("#") + 1);
                    }
                    else {
                        pages = pages.substring(0, pages.indexOf("#"));
                    }
                }
                cur = pages;
                //incase parent title

                for(var i in indices){
                    if(cur.toLowerCase() == t.substring(indices[i] + 1, indices[i] + cur.length+ 1) && t.substring(indices[i] + 1, indices[i] + 1 + t.substring(indices[i] + 1).indexOf("]]")).includes(")") ){
                        cur = t.substring(indices[i] + 1, indices[i] + 2 + t.substring(indices[i] + 1).indexOf(")") );
                    }
                    if(cur.toLowerCase() + "|" == t.substring(indices[i] + 1, indices[i] + cur.length+ 2)){
                        break;
                    }
                }
                console.log(cur);
                //console.log("-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------")
                if (cur != "philosophy" && cur != "Philosophy" ) {
                    doDoom(makeUrl(cur));
                }
            })
            .catch(function (error) { console.log(error); });
    }



}
function removePar(str) {
    var Output = str;
    while (Output != (Output = Output.replace(/\s*\([^()]*\)/g, "")));
    while (Output != (Output = Output.replace(/<[^<>]*>/g, "")));
    Output = replaceBrackets(Output);
    return Output;
}
function replaceBrackets(text) {
    var str = text;
    var result = '';
    var lvl = 0;
    for (var i = 0, len = str.length; i < len; i++) {
        var ch = str.charAt(i);
        if (ch == '{')
            lvl++;

        if (lvl == 0)
            result += ch;

        if (ch == '}')
            lvl--;
    }
    return result.replace(/\s{2,}/g, ' ');
}
function checkRedLink(url){
    fetch(url)
        .then(function (response) { return response.json(); })
        .then(function (response) {



        })
}
function makeUrl(wha) {
    var u = "https://en.wikipedia.org/w/api.php";

    var params = {
        action: "query",
        titles: wha,
        prop: "revisions",
        rvprop: "content",
        format: "json",
    };

    u = u + "?origin=*";
    Object.keys(params).forEach(function (key) { u += "&" + key + "=" + params[key]; });
    return u;
}