const os = require('os');
const fs = require('fs');
const ps = require('promise-streams');
const got = require('got');
const unzip = require('unzip-stream');
const tar = require('tar');
const ProgressBar = require('progress');
const colors = require('ansi-colors');
const log = require('fancy-log');
const mkdirp = require('mkdirp');


class System {

    static get isWindows() {
        return os.type() === 'Windows_NT';
    }

    static get isLinux() {
        return os.type() === 'Linux';
    }

    static get archInt() {
        if (os.arch() === 'ia32') return 32;
        if (os.arch() === 'x64') return 64;
    }

    static get isArch32() {
        return this.archInt === 32;
    }

    static get isArch64() {
        return this.archInt === 64;
    }
}


class Sdk {
    static set dir(value) {
        Sdk._dir = value
    }

    static get dir() {
        return Sdk._dir || `${os.homedir()}/sdk`;
    }

    static path(name, version) {
        return `${this.dir}/${name}/${version}`;
    }

    constructor(name, version) {
        this.name = name;
        this.tag = colors.green(`[${name}]`);
        this.version = version;
        this.path = Sdk.path(name, version);
    }

    get intVersion() {
        const vArr = this.version.split('\.').reverse();
        let m = 1;
        let r = 0;
        for (let v of vArr) {
            r += parseInt(v) * m;
            m *= 10;
        }
        return r;
    }

    get prepared() {
        throw "Not implemented";
    }

    get link() {
        throw "Not implemented";
    }

    prepare() {
        log(this.tag, `version: ${colors.magenta(this.version)}`);

        if (this.prepared) {
            return Promise.resolve();
        } else {
            mkdirp(this.path);
            const bar = new ProgressBar(`${this.tag} [:bar] :percent :etas`, {width: 40, total: 1000, clear: true});
            let stream = got.stream(this.link);
            stream = stream.on('downloadProgress', (p) => bar.update(p.percent));
            if (this.link.endsWith('.zip')) {
                const sep = '/';
                stream = stream.pipe(unzip.Parse()).on('entry', (entry) => {
                    const filePath = entry.path.split(sep).slice(1).join(sep);
                    if (filePath.length > 0) {
                        if (entry.type === 'Directory') {
                            mkdirp(this.path + sep + filePath);
                        } else if (entry.type === 'File') {
                            entry.pipe(fs.createWriteStream(this.path + sep + filePath));
                        }
                    } else {
                        entry.autodrain();
                    }
                });
            } else if (this.link.endsWith('tar.gz')) {
                stream = stream.pipe(tar.x({C: this.path, strip: 1}));
            } else {
                stream = stream.pipe(fs.createWriteStream(this.path));
            }
            return ps.wait(stream);
        }
    }
}

Sdk.System = System;

module.exports = Sdk;