const faSvgSprite = require('fontawesome-svg-sprite-generator'),
    SVGSpriter = require('svg-sprite'),
    path = require('path'),
    fs = require('fs'),
    fal = require('@fortawesome/pro-light-svg-icons'),
    far = require('@fortawesome/pro-regular-svg-icons'),
    fas = require('@fortawesome/pro-solid-svg-icons'),
    fsextra = require('node-fs-extra'),
    gulp = require('gulp');

let toMergeData = [];

function buildIconSprites() {
    let config = {
        src: __dirname + '/../../raw/icons',
        dest: __dirname + '/../../out/icon-sprite.svg',
        spriter: {
            shape: {
                id: {
                    generator: function (name) {
                        return "vt-" + name.replace('.svg', '');
                    }
                }
            },
            "svg": {
                "xmlDeclaration": false,
                "doctypeDeclaration": false
            },
            "mode": {
                "symbol": true
            }
        }
    };

    let icons = {
        fa: [
            fal.faPlay,
            fal.faPause,
            fal.faCaretRight,
            fal.faCaretLeft,
            fal.faRandom,
            fal.faCogs,
            fal.faFolderUpload,
            fal.faListMusic,
            fal.faFileImage,
            fal.faQuestionCircle,
        ],
        vt: []
    };

    builder.init(config, icons);
    builder.generateFontAwesome();
    builder.generateFromIcons();
    return gulp.src(config.src);
}

let builder = {
    init: function (config, icons) {
        this.config = config;
        this.icons = icons;
    },

    generateFontAwesome: function () {
        let sprite = faSvgSprite.generate(this.icons.fa, {license: '', xmlDeclaration: false});
        toMergeData.push(sprite.svg);
    },

    generateFromIcons: function () {
        builder.merge();
    },

    merge: function () {
        if (toMergeData.length === 0) {
            return;
        }
        let data = '<?xml version="1.0" encoding="UTF-8"?><svg xmlns="http://www.w3.org/2000/svg">';
        for (let item of toMergeData) {
            data += item.replace('</svg>', '').replace(/(<svg)([^<]*|[^>]*)/g, '');
        }
        data += '</svg>';

        let dirname = path.dirname(builder.config.dest);
        if (!fs.existsSync(dirname)) {
            fsextra.mkdirpSync(dirname);
        }
        fs.writeFileSync(builder.config.dest, data);
    },

    readFiles: function (dir, spriter, icons) {
        let files = fs.readdirSync(dir);
        for (let file of files) {
            let split = file.split('.');
            let suffix = split[split.length - 1];
            if (suffix === 'svg' && icons.indexOf('vt-' + split[0]) !== -1) {
                let filePath = path.resolve(dir, file);
                spriter.add(
                    filePath,
                    file,
                    fs.readFileSync(filePath, {encoding: 'utf-8'})
                );
            }
        }
    }
};

module.exports.buildIconSprites = buildIconSprites;