'use strict';

var cheerio = require('cheerio');

// http://stackoverflow.com/questions/14480345/how-to-get-the-nth-occurrence-in-a-string

function getPosition(str, m, i) {

    return str.split(m, i).join(m).length;

}

hexo.extend.filter.register('after_post_render', function (data) {

    var config = hexo.config;

    if (config.post_asset_folder) {

        var link = data.permalink;

        var beginPos = getPosition(link, '/', 3) + 1;

        var appendLink = '';

        if (/.*\/index\.html$/.test(link)) {

            appendLink = 'index/';

            var endPos = link.lastIndexOf('/');

        }

        else {

            var endPos = link.lastIndexOf('.');

        }

        link = link.substring(beginPos, endPos) + '/' + appendLink;

        var toprocess = ['excerpt', 'more', 'content'];

        for (var i = 0; i < toprocess.length; i++) {

            var key = toprocess[i];

            var $ = cheerio.load(data[key], {

                ignoreWhitespace: false,

                xmlMode: false,

                lowerCaseTags: false,

                decodeEntities: false

            });

            $('img').each(function () {

                if ($(this).attr('data-src')) {

                    var src = $(this).attr('data-src').replace('\\', '/');

                    if (!(/http[s]*.*|\/\/.*/.test(src)

                        || /^\s+\//.test(src)

                        || /^\s*\/uploads|images\//.test(src))) {

                        var srcArray = src.split('/').filter(function (elem) {

                            return elem != '' && elem != '.';

                        });

                        if (srcArray.length > 1)

                            srcArray.shift();

                        src = srcArray.join('/');

                        $(this).attr('data-src', config.root + link + src);

                        console.info && console.info("update link as:-->" + config.root + link + src);

                    }

                }

                else {

                    console.info && console.info("no src attr, skipped...");

                    console.info && console.info($(this));

                }

            });

            data[key] = $.html();

        }

    }

});