/* global hexo */
'use strict';
var CleanCSS = require('clean-css'),
    UglifyJS = require('uglify-js'),
    Htmlminifier = require('html-minifier').minify,
    streamToArray = require('stream-to-array');
var Promise = require('bluebird');
var minimatch = require('minimatch');
var zlib = require('zlib');
var br = require('iltorb');

function logic_html(str, data) {
    var hexo = this,
        options = hexo.config.neat_html;
    // Return if disabled.
    if (false === options.enable) return;

    var path = data.path;
    var exclude = options.exclude;
    if (exclude && !Array.isArray(exclude)) exclude = [exclude];

    if (path && exclude && exclude.length) {
        for (var i = 0, len = exclude.length; i < len; i++) {
            if (minimatch(path, exclude[i], {matchBase: true})) return str;
        }
    }

    var result = Htmlminifier(str, options);
    var saved = ((str.length - result.length) / str.length * 100).toFixed(2);
    if (options.logger) {
        var log = hexo.log || console.log;
        log.log('Minify the html: %s [%s saved]', path, saved + '%');
    }
    return result;
}

function logic_css(str, data) {
    var hexo = this,
        options = hexo.config.neat_css;
    // Return if disabled.
    if (false === options.enable) return;

    var path = data.path;
    var exclude = options.exclude;
    if (exclude && !Array.isArray(exclude)) exclude = [exclude];

    if (path && exclude && exclude.length) {
        for (var i = 0, len = exclude.length; i < len; i++) {
            if (minimatch(path, exclude[i], {matchBase: true})) return str;
        }
    }

    return new Promise(function (resolve, reject) {
        new CleanCSS({level:2}).minify(str, function (err, result) {
            if (err) return reject(err);
            var saved = ((str.length - result.styles.length) / str.length * 100).toFixed(2);
            resolve(result.styles);
            if (options.logger) {
                var log = hexo.log || console.log;
                log.log('Minify the css: %s [%s saved]', path, saved + '%');
            }
        });
    });
}

function logic_js(str, data) {
    var hexo = this,
        options = hexo.config.neat_js;
    // Return if disabled.
    if (false === options.enable) return;

    var path = data.path;
    var exclude = options.exclude;
    if (exclude && !Array.isArray(exclude)) exclude = [exclude];

    if (path && exclude && exclude.length) {
        for (var i = 0, len = exclude.length; i < len; i++) {
            if (minimatch(path, exclude[i], {matchBase: true})) return str;
        }
    }

    //uglifyjs doesn't like unsupported options
    delete options.enable;
    delete options.exclude;
    var js_logger = options.logger;
    delete options.logger;

    var result = UglifyJS.minify(str, options);
    var saved = ((str.length - result.code.length) / str.length * 100).toFixed(2);
    if (js_logger) {
        var log = hexo.log || console.log;
        log.log('Minify the js: %s [%s saved]', path, saved + '%');
    }
    return result.code;
}

function logic_gzip() {
    var hexo = this,
        options = hexo.config.neat_gzip;
    // Return if disabled.
    if (false === options.enable) return;

    var gz_logger = options.logger;
    const route = hexo.route;
    const routeList = route.list();
    
    return Promise.all(routeList.filter(path => (path.endsWith('.html') || path.endsWith('.js') || path.endsWith('.css'))).map(path => {
      return new Promise((resolve, reject) => {
        // Grab all assets using hexo router
        const assetPath = route.get(path);
        let assetTxt = '';
        // Extract the content
        assetPath.on('data', (chunk) => (assetTxt += chunk));
        assetPath.on('end', () => {
          if (assetTxt.length) {
            // gzip compress using highest level
            zlib.gzip(assetTxt, {level:zlib.Z_BEST_COMPRESSION}, (err, buffer) => {
              if (!err) {
                // Save the compressed file to .gz
                route.set(path + '.gz', buffer);
                //Logging
                var saved = ((assetTxt.length - buffer.toString().length) / assetTxt.length * 100).toFixed(2);
                if (gz_logger) {
                    var log = hexo.log || console.log;
                    log.log('Gzip-compressed %s [%s saved]', path, saved + '%');
                }
                resolve(assetTxt);
              } else {
                reject(err);
              }
            });
          }
        });
      });
    }));
}

function logic_brotli() {
    var hexo = this,
        options = hexo.config.neat_brotli;
    // Return if disabled.
    if (false === options.enable) return;

    var br_logger = options.logger;
    const route = hexo.route;
    const routeList = route.list();
    
    return Promise.all(routeList.filter(path => (path.endsWith('.html') || path.endsWith('.js') || path.endsWith('.css'))).map(path => {
      return new Promise((resolve, reject) => {
        // Grab all assets using hexo router
        const assetPath = route.get(path);
        let assetTxt = '';
        // Extract the content
        assetPath.on('data', (chunk) => (assetTxt += chunk));
        assetPath.on('end', () => {
          if (assetTxt.length) {
            // Input has to be buffer for brotli
            var buffer = new Buffer.from(assetTxt, "utf-8");
            // brotli compress using highest level
            br.compress(buffer, {quality:br.BROTLI_MAX_QUALITY}, (err, output) => {
              if (!err) {
                // Save the compressed file to .br
                route.set(path + '.br', output);
                //Logging
                var saved = ((buffer.length - output.toString().length) / buffer.length * 100).toFixed(2);
                if (br_logger) {
                    var log = hexo.log || console.log;
                    log.log('Brotli-compressed %s [%s saved]', path, saved + '%');
                }
                resolve(assetTxt);
              } else {
                reject(err);
              }
            });
          }
        });
      });
    }));
}

module.exports = {
    logic_html: logic_html,
    logic_css: logic_css,
    logic_js: logic_js,
    logic_gzip: logic_gzip,
    logic_brotli: logic_brotli
};