const os = require('os');
const fs = require('fs');
const fse = require('fs-extra');
const path = require('path');
const exec = require('./exec');
const Sdk = require('./sdk');
const Neko = require('./neko');
const colors = require('ansi-colors');
const log = require('fancy-log');
const vfs = require('vinyl-fs');
const template = require('lodash.template');


class Haxe extends Sdk {

    getBin(name) {
        if (Sdk.System.isWindows) {
            return path.join(this.binPath, name + '.exe');
        } else if (Sdk.System.isLinux) {
            const binPath = path.join(this.binPath, name);
            if (fs.existsSync(binPath)) {
                fs.chmodSync(binPath, 0o755);
            }
            return binPath;
        }
        throw `Unsupported OS: ${os.type()}`;
    }

    get binPath() {
        return `${this.path}`;
    }

    get haxeBin() {
        return this.getBin('haxe');
    }

    get haxelibBin() {
        return this.getBin('haxelib');
    }

    constructor(version) {
        super(Haxe.ID, version || Haxe.VERSION);
        this.neko = new Neko();
    }

    get prepared() {
        try {
            return fs.existsSync(this.haxeBin);
        } catch (e) {
            return false;
        }
    }

    activate() {
        this.neko.activate()
        process.env.HAXE_VERSION = this.version;
        process.env.HAXE_STD_PATH = path.join(this.binPath, 'std');
        process.env.HAXE_HOME = this.binPath;
        if (process.env.PATH.split(path.delimiter).indexOf(this.binPath) === -1) {
            process.env.PATH = [process.env.PATH, this.binPath].join(path.delimiter);
        }
    }

    prepare() {
        return Promise.all([this.neko.prepare(), super.prepare()]);
    }

    get link() {
        if (Sdk.System.isWindows) {
            return `https://github.com/HaxeFoundation/haxe/releases/download/${this.version}/haxe-${this.version}-win.zip`;
        } else if (Sdk.System.isLinux) {
            let arch = Sdk.System.archInt;
            return `https://github.com/HaxeFoundation/haxe/releases/download/${this.version}/haxe-${this.version}-linux${arch}.tar.gz`;
        }
    }

    haxe(args) {
        return exec('.', [this.haxeBin].concat(args).join(' '));
    }

    haxelib(args) {
        return exec('.', [this.haxelibBin].concat(args).join(' '));
    }

    openfl(command, platform, config, debug=false) {
        log(this.tag, colors.cyan(`openfl build ${platform}`));
        this.activate()
        const buildDir = path.join(os.tmpdir(), 'build', config.name);
        fse.ensureDirSync(buildDir);

        const projectTemplate = template(fs.readFileSync(path.resolve(__dirname, '..', 'template/project.xml')));
        const project = projectTemplate({...config, buildDir: buildDir});
        fs.writeFileSync(path.resolve(buildDir, 'project.xml'), project);

        const args = ['-cwd', buildDir, 'run', 'openfl', command, platform];
        if (debug) {
            args.push('-debug');
        }
        const target = path.resolve(buildDir, platform, 'bin');
        fse.emptyDirSync(target);
        return this.haxelib(args).then(() => vfs.src(`${target}/**/*`));
    }

    build(platform, config, debug=false) {
        log(this.tag, colors.cyan(`build ${platform}`));
        this.activate()
        const buildDir = path.join(os.tmpdir(), 'build', config.name);
        fse.ensureDirSync(buildDir);

        const projectTemplate = template(fs.readFileSync(path.resolve(__dirname, '..', 'template/project.hxml')));

        const ext = {
            flash: '.swf',
            neko: '.n',
        }[platform] || '';

        const out = {
            flash: 'swf'
        }[platform] || platform;

        const project = projectTemplate({...config, buildDir: buildDir, platform: platform, ext: ext, out: out});
        const projectHXML = path.resolve(buildDir, 'project.hxml');
        fs.writeFileSync(projectHXML, project);

        const args = [projectHXML];
        if (debug) {
            args.push('-debug');
        }
        const target = path.resolve(buildDir, platform, 'bin');
        fse.emptyDirSync(target)
        for (const asset of config.assets) {
            fse.copySync(asset, path.join(target, asset.split(path.sep).pop()));
        }
        return this.haxe(args).then(() => vfs.src(`${target}/**/*`));
    }

    install(packages) {
        this.activate()
        let promise = this.haxelib(['setup', path.join(this.path, 'lib')]);
        const next = (args) => () => {
            log(this.tag, colors.cyan('haxelib', 'install'), colors.magenta(args[1]));
            return this.haxelib(args);
        };

        if (!Array.isArray(packages)) {
            packages = Object.entries(packages).map(([k, v]) => ({name: k, version: v}));
        }

        for (let pack of packages) {
            const args = [];
            let version = null;
            if (typeof pack === 'string') {
                args.push('install', pack);
            } else if (typeof pack === 'object') {
                version = pack.version;
                if (version.substr(0, 3) === 'git') {
                    pack.git = version;
                    version = null;
                }
                if (pack.git) {
                    args.push('git', pack.name, pack.git);
                    if (pack.branch) args.push(pack.branch);
                } else {
                    args.push('install', pack.name);
                    if (version) args.push(version);
                }
                args.push('--always');
            }
            let path = `${this.path}/lib/${args[1]}`;
            if (version) {
                path += `/${version.replace(/\./g, ',')}`;
            } else if (pack.git) {
                path += '/git';
            }
            if (!fs.existsSync(path)) {
                promise = promise.then(next(args));
            }
        }
        return promise;
    }

    upgrade() {
        let promise = this.haxelib(['setup', path.join(this.path, 'lib')]);
        promise = promise.then(() => this.haxelib(['upgrade', '--always']));
        return promise;
    }
}

Haxe.ID = 'haxe';

Haxe.VERSION_3_4_0 = '3.4.0';
Haxe.VERSION_3_4_2 = '3.4.2';
Haxe.VERSION_3_4_3 = '3.4.3';
Haxe.VERSION_3_4_7 = '3.4.7';
Haxe.VERSION_3 = Haxe.VERSION_3_4_7;
Haxe.VERSION = Haxe.VERSION_3;

module.exports = Haxe;