#!/usr/bin/env node
'use strict';

// -------------------------------------------------

const webapp_icons = [
    {name: 'android-chrome-192x192.png', size: 192},
    {name: 'android-chrome-512x512.png', size: 512},
    {name: 'apple-touch-icon.png', size: 180},
    {name: 'mstile-150x150.png', size: 150}
];

const webapp_splash_screens = [
    {w:  640, h: 1136, center: 320},
    {w:  750, h: 1294, center: 375},
    {w: 1125, h: 2436, center: 565},
    {w: 1242, h: 2148, center: 625},
    {w: 1536, h: 2048, center: 770},
    {w: 1668, h: 2224, center: 820},
    {w: 2048, h: 2732, center: 1024}
];

const external_js = [
    'underscore',
    'superagent',
    'mousetrap',
    'js-cookie',
    'nprogress',
];

// -------------------------------------------------

const fs = require('fs');
const glob = require('glob');
const path = require('path');
const util = require('util');
const execSync = require('child_process').execSync;

function readTextFile(path) {
    return fs.readFileSync(path, 'utf-8');
}

function gzipFile(file) {
    file = path.normalize(file);
    execSync('gzip -6 -k ' + file);
}

// -------------------------------------------------

function bundleHtml() {
    const underscore = require('underscore');
    const babelify = require('babelify');

    const baseUrl = process.env.BASE_URL ? process.env.BASE_URL : '/';

    function minifyHtml(html) {
        return require('html-minifier').minify(html, {
            removeComments: true,
            collapseWhitespace: true,
            conservativeCollapse: true,
        }).trim();
    }

    const baseHtml = readTextFile('./html/index.htm')
        .replace('<!-- Base HTML Placeholder -->', `<base href="${baseUrl}"/>`);
    fs.writeFileSync('./public/index.htm', minifyHtml(baseHtml));

    let compiledTemplateJs = [
        `'use strict';`,
        `let _ = require('underscore');`,
        `let templates = {};`
    ];

    for (const file of glob.sync('./html/**/*.tpl')) {
        const name = path.basename(file, '.tpl').replace(/_/g, '-');
        const placeholders = [];
        let templateText = readTextFile(file);
        templateText = templateText.replace(
            /<%.*?%>/ig,
            (match) => {
                const ret = '%%%TEMPLATE' + placeholders.length;
                placeholders.push(match);
                return ret;
            });
        templateText = minifyHtml(templateText);
        templateText = templateText.replace(
            /%%%TEMPLATE(\d+)/g,
            (match, number) => { return placeholders[number]; });

        const functionText = underscore.template(
            templateText, {variable: 'ctx'}).source;

        compiledTemplateJs.push(`templates['${name}'] = ${functionText};`);
    }
    compiledTemplateJs.push('module.exports = templates;');

    fs.writeFileSync('./js/.templates.autogen.js', compiledTemplateJs.join('\n'));
    console.info('Bundled HTML');
}

function bundleCss() {
    const stylus = require('stylus');

    function minifyCss(css) {
        return require('csso').minify(css).css;
    }

    let css = '';
    for (const file of glob.sync('./css/**/*.styl')) {
        css += stylus.render(readTextFile(file), {filename: file});
    }
    fs.writeFileSync('./public/css/app.min.css', minifyCss(css));
    if (process.argv.includes('--gzip')) {
        gzipFile('./public/css/app.min.css');
    }

    fs.copyFileSync(
        './node_modules/font-awesome/css/font-awesome.min.css',
        './public/css/vendor.min.css');
    if (process.argv.includes('--gzip')) {
        gzipFile('./public/css/vendor.min.css');
    }

    console.info('Bundled CSS');
}

function bundleJs() {
    const browserify = require('browserify');

    function minifyJs(path) {
        return require('terser').minify(
            fs.readFileSync(path, 'utf-8'), {compress: {unused: false}}).code;
    }

    function writeJsBundle(b, path, compress, callback) {
        let outputFile = fs.createWriteStream(path);
        b.bundle().pipe(outputFile);
        outputFile.on('finish', () => {
            if (compress) {
                fs.writeFileSync(path, minifyJs(path));
            }
            callback();
        });
    }

    if (!process.argv.includes('--no-vendor-js')) {
        let b = browserify();
        for (let lib of external_js) {
            b.require(lib);
        }
        if (!process.argv.includes('--no-transpile')) {
            b.add(require.resolve('babel-polyfill'));
        }
        const file = './public/js/vendor.min.js';
        writeJsBundle(b, file, true, () => {
            if (process.argv.includes('--gzip')) {
                gzipFile(file);
            }
            console.info('Bundled vendor JS');
        });
    }

    if (!process.argv.includes('--no-app-js')) {
        let b = browserify({debug: process.argv.includes('--debug')});
        if (!process.argv.includes('--no-transpile')) {
            b = b.transform('babelify');
        }
        b = b.external(external_js).add(glob.sync('./js/**/*.js'));
        const compress = !process.argv.includes('--debug');
        const file = './public/js/app.min.js';
        writeJsBundle(b, file, compress, () => {
            if (process.argv.includes('--gzip')) {
                gzipFile(file);
            }
            console.info('Bundled app JS');
        });
    }
}

function bundleConfig() {
    function getVersion() {
        let build_info = process.env.BUILD_INFO;
        if (!build_info) {
            try {
                build_info = execSync('git describe --always --dirty --long --tags').toString();
            } catch (e) {
                console.warn('Cannot find build version');
                build_info = 'unknown';
            }
        }
        return build_info.trim();
    }
    const config = {
        meta: {
          version: getVersion(),
          buildDate: new Date().toUTCString()
        }
    };

    fs.writeFileSync('./js/.config.autogen.json', JSON.stringify(config));
}

function bundleBinaryAssets() {
    fs.copyFileSync('./img/favicon.png', './public/img/favicon.png');
    fs.copyFileSync('./img/transparency_grid.png', './public/img/transparency_grid.png');
    console.info('Copied Images');

    fs.copyFileSync('./fonts/open_sans.woff2', './public/fonts/open_sans.woff2')
    for (let file of glob.sync('./node_modules/font-awesome/fonts/*.*')) {
        if (fs.lstatSync(file).isDirectory()) {
            continue;
        }
        fs.copyFileSync(file, path.join('./public/fonts/', path.basename(file)));
    }
    if (process.argv.includes('--gzip')) {
        for (let file of glob.sync('./public/fonts/*.*')) {
            if (file.endsWith('woff2')) {
                continue;
            }
            gzipFile(file);
        }
    }
    console.info('Copied Fonts')
}

function bundleWebAppFiles() {
    const Jimp = require('jimp');

    fs.copyFileSync('./app/manifest.json', './public/manifest.json');

    Promise.all(webapp_icons.map(icon => {
        return Jimp.read('./img/app.png')
        .then(file => {
            file.resize(icon.size, Jimp.AUTO, Jimp.RESIZE_BEZIER)
                .write(path.join('./public/img/', icon.name));
        });
    }))
    .then(() => {
        console.info('Generated webapp icons');
    });

    Promise.all(webapp_splash_screens.map(dim => {
        return Jimp.read('./img/splash.png')
        .then(file => {
            file.resize(dim.center, Jimp.AUTO, Jimp.RESIZE_BEZIER)
                .background(0xFFFFFFFF)
                .contain(dim.w, dim.center,
                    Jimp.HORIZONTAL_ALIGN_CENTER | Jimp.VERTICAL_ALIGN_MIDDLE)
                .contain(dim.w, dim.h,
                    Jimp.HORIZONTAL_ALIGN_CENTER | Jimp.VERTICAL_ALIGN_MIDDLE)
                .write(path.join('./public/img/',
                    'apple-touch-startup-image-' + dim.w + 'x' + dim.h + '.png'));
        });
    }))
    .then(() => {
        console.info('Generated splash screens');
    });
}

function makeOutputDirs() {
    const dirs = [
        './public',
        './public/css',
        './public/fonts',
        './public/img',
        './public/js'
    ];
    for (let dir of dirs) {
        if (!fs.existsSync(dir)) {
            fs.mkdirSync(dir, 0o755);
        }
    }
}

// -------------------------------------------------

makeOutputDirs();
bundleConfig();
bundleBinaryAssets();
bundleWebAppFiles();
if (!process.argv.includes('--no-html')) {
    bundleHtml();
}
if (!process.argv.includes('--no-css')) {
    bundleCss();
}
if (!process.argv.includes('--no-js')) {
    bundleJs();
}