/**
 * Jake build script
 */
var jake = require('jake'),
    browserify = require('browserify'),
    path = require('path'),
    fs = require('fs');

require('jake-utils');

// constants
var VIS = './vis.js';
var VIS_TMP = './vis.js.tmp';
var VIS_MIN = './vis.min.js';

/**
 * default task
 */
desc('Execute all tasks: build all libraries');
task('default', ['build', 'minify'], function () {
    console.log('done');
});

/**
 * build the visualization library vis.js
 */
desc('Build the visualization library vis.js');
task('build', {async: true}, function () {
    // concatenate and stringify css files
    var result = concat({
        src: [
            './src/component/css/panel.css',
            './src/component/css/item.css',
            './src/component/css/timeaxis.css'
        ],
        header: '/* vis.js stylesheet */',
        separator: '\n'
    });
    var cssText = JSON.stringify(result.code);

    // concatenate the script files
    concat({
        dest: VIS_TMP,
        src: [
            './src/module/imports.js',

            './src/util.js',
            './src/events.js',
            './src/timestep.js',
            './src/dataset.js',
            './src/stack.js',
            './src/range.js',
            './src/controller.js',

            './src/component/component.js',
            './src/component/panel.js',
            './src/component/rootpanel.js',
            './src/component/timeaxis.js',
            './src/component/itemset.js',
            './src/component/item/*.js',

            './src/visualization/timeline.js',

            './src/module/exports.js'
        ],

        separator: '\n',

        // Note: we insert the css as a string in the javascript code here
        //       the css will be injected on load of the javascript library
        footer: '// inject css\n' +
            'util.loadCss(' + cssText + ');\n'
    });

    // bundle the script files
    // TODO: do not package moment.js with vis.js.
    var b = browserify();
    b.add(VIS_TMP);
    b.bundle({
        standalone: 'vis'
    }, function (err, code) {
        // add header and footer
        var lib = read('./src/header.js') + code;

        // write bundled file
        write(VIS, lib);
        console.log('created ' + VIS);

        // remove temporary file
        fs.unlinkSync(VIS_TMP);

        // update version number and stuff in the javascript files
        replacePlaceholders(VIS);

        complete();
    });
});

/**
 * minify the visualization library vis.js
 */
desc('Minify the visualization library vis.js');
task('minify', function () {
    // minify javascript
    minify({
        src: VIS,
        dest: VIS_MIN,
        header: read('./src/header.js')
    });

    // update version number and stuff in the javascript files
    replacePlaceholders(VIS_MIN);

    console.log('created ' + VIS_MIN);
});

/**
 * replace version, date, and name placeholders in the provided file
 * @param {String} filename
 */
var replacePlaceholders = function (filename) {
    replace({
        replacements: [
            {pattern: '@@name',    replacement: 'vis.js'},
            {pattern: '@@date',    replacement: today()},
            {pattern: '@@version', replacement: version()}
        ],
        src: filename
    });
};