const gulp              = require('gulp');
const gulpTwig          = require('gulp-twig');
const gulpData          = require('gulp-data');
const gulpRename        = require('gulp-rename');
const gulpDartSass      = require('gulp-dart-sass');
const gulpSourcemaps    = require('gulp-sourcemaps');
const gulpAutoprefixer  = require('gulp-autoprefixer');
const gulpHtmlBeautify  = require('gulp-html-beautify');
const gulpCssNano       = require('gulp-cssnano');
const gulpIf            = require('gulp-if');
const gulpSvg           = require('gulp-svg-sprite');
const gulpAppendPrepend = require('gulp-append-prepend');
const fancyLog          = require('fancy-log');
const fs                = require('fs');
const path              = require('path');
const mergeStream       = require('merge-stream');


/**
 * Compiles twig files to html
 */
function twig(options) {
    options = Object.assign({
        analytics: '',
        direction: 'ltr',
    }, typeof options !== 'undefined' ? options : {});

    return gulp.src(['src/twig/pages/*'])
        .pipe(gulpData(() => {
            const result = {
                analytics: options.analytics,
                direction: options.direction,
            };
            const files = fs.readdirSync('src/data');

            for (let file of files) {
                result[path.basename(file, '.json')] = JSON.parse(fs.readFileSync('src/data/'+file).toString());
            }

            return result;
        }))
        .pipe(gulpTwig({base: 'src/twig/', data: gulpData}))
        .on('error', function (error) {
            fancyLog.error(error);
            this.emit('end');
        })
        .pipe(gulpRename(path => path.extname = '.html'))
        .pipe(gulpHtmlBeautify({indent_size: 4, max_preserve_newlines: 0}));
}


/**
 * Compiles scss files to css
 */
function scss(options) {
    options = Object.assign({
        production: false,
        theme: 'classic',
        pack: false,
    }, typeof options !== 'undefined' ? options : {});

    let prependText = '//';

    if (options.theme !== 'classic') {
        prependText = '@import "'+options.theme+'-theme";';
    }

    let src = ['src/scss/style.scss'];

    if (options.pack) {
        src.push('src/scss/style.ltr.scss');
        src.push('src/scss/style.rtl.scss');
    }

    return gulp.src(src)
        .pipe(gulpIf(!options.production, gulpSourcemaps.init()))
        .pipe(gulpAppendPrepend.prependText(prependText))
        .pipe(gulpDartSass({
            outputStyle: 'expanded'
        }))
        .pipe(gulpAutoprefixer())
        .on('error', function (error) {
            fancyLog.error(error);
            this.emit('end');
        })
        .pipe(gulpIf(options.production, gulpCssNano()))
        .pipe(gulpIf(!options.production, gulpSourcemaps.write('./')))
        .pipe(gulpRename(path => path.dirname = `css/${path.dirname}`));
}


/**
 * Copies vendor directory to dist directory
 */
function vendor() {
    const tasks = [
        gulp.src(['src/vendor/**/*']).pipe(gulpRename(path => path.dirname = `vendor/${path.dirname}`)),
    ];

    const modules = {
        'node_modules/@fortawesome/fontawesome-free/css/**/*':      'vendor/fontawesome/css',
        'node_modules/@fortawesome/fontawesome-free/webfonts/**/*': 'vendor/fontawesome/webfonts',
        'node_modules/@fortawesome/fontawesome-free/LICENSE.txt':   'vendor/fontawesome',
        'node_modules/jquery/dist/**/*':                            'vendor/jquery',
        'node_modules/nouislider/dist/**/*':                        'vendor/nouislider',
        'node_modules/owl.carousel/dist/**/*':                      'vendor/owl-carousel',
        'node_modules/photoswipe/dist/**/*':                        'vendor/photoswipe',
        'node_modules/svg4everybody/dist/**/*':                     'vendor/svg4everybody',
        'node_modules/bootstrap/dist/**/*':                         'vendor/bootstrap',
    };

    for (let source in modules) {
        if (modules.hasOwnProperty(source)) {
            const dest = modules[source];

            tasks.push(
                gulp.src(source).pipe(gulpRename(path => path.dirname = `${dest}/${path.dirname}`))
            );
        }
    }

    return mergeStream(...tasks);
}


/**
 * Copies images to dist directory
 */
function images() {
    return gulp.src(['src/images/**/*'])
        .pipe(gulpRename(path => path.dirname = `images/${path.dirname}`));
}


/**
 * Compiles svg sprite
 */
function svg() {
    return gulp.src('src/svg/**/*.svg')
        .pipe(gulpSvg({
            mode: {
                symbol: {
                    dest: '',
                    sprite: 'sprite.svg',
                    prefix: 'svg-%s'
                }
            }
        }))
        .pipe(gulpRename(path => path.dirname = `images/${path.dirname}`));
}


/**
 * Compiles js
 */
function js() {
    return gulp.src(['src/js/**/*'])
        .pipe(gulpRename(path => path.dirname = `js/${path.dirname}`));
}


exports.twig = twig;
exports.scss = scss;
exports.vendor = vendor;
exports.images = images;
exports.svg = svg;
exports.js = js;