var xpath = require('xpath'),
    dom = require('xmldom').DOMParser;
const {
    http,
    https
} = require('follow-redirects');
const fs = require('fs');
const axios = require('axios');
const glob = require('glob');
const unzipper = require('unzipper');

const data = {
    fy_Maps: { location: `${__dirname}/dl/fy`, maxPage: 21 },
    as_Maps: { location: `${__dirname}/dl/as`, maxPage: 4 },
    de_Maps: { location: `${__dirname}/dl/de`, maxPage: 26 },
    cs_Maps: { location: `${__dirname}/dl/cs`, maxPage: 20 },
    climbing_maps: { location: `${__dirname}/dl/climbing`, maxPage: 10 },
}

//downloadMaps('fy_Maps'); // must be fy_Maps, climbing_maps, as_Maps, cs_Maps, de_Maps, Map%2BPacks, WAD%2BFiles, pa_Maps%252CHybrid%2BMaps, Aktuelle%2BMaps
unzipMaps('fy_Maps');

function downloadMaps(inCategory) {
    console.log(`Category: ${data[inCategory].maxPage}`);

    for (let index = 0; index <= data[inCategory].maxPage; index++) {
        console.log(index);
        // create overview url
        const overviewUrl = `https://www.4players.de/cs.php/download_list/-/cs1.6/Maps/${inCategory}/-/-/-/${index}/index.html`;

        axios.get(overviewUrl).then(function (response) {
            // extract nodes using xpath
            const doc = new dom().parseFromString(response.data);
            const nodes = xpath.select("//a[contains(@class, 'button') and text() = 'Download']/@href", doc);

            nodes.forEach(element => {
                // generate download url
                const id = (element.value.split("/"))[14];
                const dlUrl = `https://www.4players.de/cs.php/download_start/-/download/${id}/1/index.html`;

                https.get(dlUrl, response => {
                    // get zip filename by following redirect and create filepath
                    const zipName = (response.responseUrl.split("/")).pop();
                    const filePath = `${data[inCategory].location}/${zipName}`;

                    // download file
                    const file = fs.createWriteStream(filePath);
                    http.get(response.responseUrl, function (response) {
                        response.pipe(file);
                    });
                }).on('error', err => {
                    console.error(err);
                });
            });
        }).catch(function (error) {
            // handle error
            console.log(error);
        }).then(function () {
            // always executed
        });
    }
}

function unzipMaps(inCategory) {
    glob(`${data[inCategory].location}/*.zip`, {}, (err, files) => {
        console.log(files)

        for (let index = 0; index < files.length; index++) {
            const element = files[index];
            fs.createReadStream(element)
                .pipe(unzipper.Parse())
                .on('entry', function (entry) {
                    const fileName = entry.path.toLowerCase();
                    const type = entry.type; // 'Directory' or 'File'
                    //const size = entry.vars.uncompressedSize; // There is also compressedSize;

                    if (type === 'File') {
                        const paths = fileName.split("/");

                        if (paths.indexOf("podbot") !== -1 || paths.indexOf("podbots") !== -1)
                            return;

                        const index = paths.indexOf("cstrike");

                        if (index !== -1) {
                            const dir = paths.slice(index + 1, paths.length - 1).join("/");
                            const fullDirPath = `${__dirname}/extract/${dir}`;
                            fs.mkdirSync(fullDirPath, { recursive: true });

                            const filePath = paths.slice(index + 1, paths.length).join("/");
                            const extractFilePath = `${__dirname}/extract/${filePath}`;
                            entry.pipe(fs.createWriteStream(extractFilePath));
                        }
                    }
                });
        }
    })
}