(function (window, undefined) {
    "use strict";
    var links = [];  // 所有css 地址
    var importlinks = [];
    var precss = []; // 原始css
    var csslinks = [];   // 所有css 地址
    var allcsslist = [];  // 所有样式列表{minwidth, maxwidth, csslist} 
    var cssstyle = null; // css样式对象
    var csstextnode = null; // css 字符串对象
    var max_width = 1920; // 最大比例尺寸 
    var mediacss = []; // media样式列表{minwidth, maxwidth, csslist} 

    var loadlinks = function () {
        var styles = document.getelementsbytagname('link');
        var filteredlinks = [];
        for (var i = 0; i < styles.length; i++) {
            if (styles[i].rel.tolowercase() === 'stylesheet' && styles[i].getattribute('use-ie') !== null) {
                filteredlinks.push(styles[i].href);
            }
        }
        return filteredlinks;
    }

    var processlinks = function () {
        links = loadlinks();
        // console.log(links);
        for (var i = 0; i < links.length; i++) {
            xhr(links[i], storecss);
        }
    };

    var xhr = function (url, callback) {
        try {
            var xhr = window.activexobject ? (new activexobject('microsoft.xmlhttp') || new activexobject('msxml2.xmlhttp')) : new xmlhttprequest();

            xhr.open('get', url, true);
            xhr.onreadystatechange = function () {
                if (xhr.readystate === 4) {
                    callback(xhr, url);
                }
            };
            xhr.send(null);
        } catch (e) {
            if (window.xdomainrequest) {
                var xdr = new xdomainrequest();
                xdr.open('get', url);
                xdr.onload = function () {
                    callback(xdr, url);
                };
                xdr.onerror = function () {
                    return false;
                };
                xdr.send();
            }
        }
    }
    var storecss = function (response, link) {
        //console.log(response, link);
        precss.push(response.responsetext);
        csslinks.push(link);
        var css = response.responsetext;
        css = parseimport(css);
        css = parsemedia(css);
        var csslist = parsecss(css);
        // console.log(csslist);
        allcsslist.push({
            minwidth: 0,
            maxwidth: 0,
            csslist: csslist,
        });

        if (csslinks.length === links.length) {
            if (importlinks.length == 0) {
                buildallcss();

                $(window).resize(function () {
                    buildallcss();
                    //console.log("resize");
                });

            } else {
                var list = importlinks;
                importlinks = [];
                for (var j = 0; j < list.length; j++) {
                    links.push(list[j])
                }
                for (var j = 0; j < list.length; j++) {
                    xhr(list[j], storecss);
                }
            }
        }
    }

    // 去掉左右空格
    var trim = function (x) {
        if (x)
            return x.replace(/^\s+|\s+$/gm, '');
        else
            return "";
    }

    // 解析css
    var parsecss = function (css) { 
        var csslist = [];
        css = css.replace(/\n/g, "").replace(/\r/g, "");
        var pattern = /(.*?){(.*?)}/gi;
        var current = css.match(pattern); 
        if (current != null) {
            for (var j = 0; j < current.length; j++) {
                var rule = current[j].replace(/\n/g, "").replace(/\r/g, ""); // 去除回车换行 
                var index = rule.indexof("{");
                var key = trim(rule.substr(0, index));
                var content = rule.substr(index + 1).replace("}", "");
                var items = content.split(";");
                var attrlist = [];
                for (var i = 0; i < items.length; i++) {
                    if (trim(items[i]) != "") {
                        var sk = items[i].split(":");
                        var sk0 = trim(sk[0]).tolowercase();
                        var sk1 = trim(sk[1]).tolowercase();
                        //console.log(sk1s);
                        var ls = [];
                        if (sk0 == "background") {
                            // 背景 
                            var lsvalue = { "ovalue": sk1, "ispx": false, "unit": "", "value": sk1, "isbg": true, "url": "" };
                            var urls = sk1.match(/url\((.*?)\)/gi);
                            if (urls != null && urls.length > 0) {
                                var url = urls[0].substring(4, urls[0].length - 1);
                                lsvalue["url"] = url;
                            }
                            ls.push(lsvalue);
                        } else if (sk1.indexof("px") >= 0) {
                            var sk1s = sk1.split(" ");
                            for (var z = 0; z < sk1s.length; z++) {
                                if (trim(sk1s[z]) != "") {
                                    var lsvalue = { "ovalue": sk1s[z], "ispx": false, "unit": "", "value": sk1s[z], "isbg": false, "url": "" };
                                    if (sk1s[z].indexof("px") >= 0) {
                                        lsvalue['unit'] = 'px';
                                        var val = parsefloat(sk1s[z].replace("px", ""));
                                        lsvalue['value'] = val;
                                        lsvalue["ispx"] = true;
                                    }
                                    ls.push(lsvalue);
                                }
                            }
                        } else if (sk1.indexof("rem") >= 0) {
                            var sk1s = sk1.split(" ");
                            for (var z = 0; z < sk1s.length; z++) {
                                if (trim(sk1s[z]) != "") {
                                    var lsvalue = { "ovalue": sk1s[z], "ispx": false, "unit": "", "value": sk1s[z], "isbg": false, "url": "" };
                                    if (sk1s[z].indexof("rem") >= 0) {
                                        lsvalue['unit'] = 'px';
                                        var val = parsefloat(sk1s[z].replace("rem", ""));
                                        lsvalue['value'] = val * 100;
                                        lsvalue["ispx"] = true;
                                    }
                                    ls.push(lsvalue);
                                }
                            }
                        } else {
                            var lsvalue = { "ovalue": sk1, "ispx": false, "unit": "", "value": sk1, "isbg": false, "url": "" };
                            ls.push(lsvalue);
                        }
                        attrlist.push({
                            key: sk0,
                            values: ls
                        });
                    }
                }
                csslist.push({
                    classname: key,
                    attrlist: attrlist,
                })
            }
        }
        return csslist;
    }

    // 解析 import
    var parseimport = function (csstext) {
        var pattern = /@import\s*url\(.*?\)\s*;/gi;
        var current = csstext.match(pattern);
        if (current != null) {
            for (var i = 0; i < current.length; i++) {
                var first = current[i].indexof("(");
                var end = current[i].indexof(")");
                var url = current[i].substring(first + 2, end - 1);
                importlinks.push("css/" + url);
                csstext = csstext.replace(current[i], "");
            }
        }
        return csstext;
    }

    // 解析媒体
    var parsemedia = function (csstext) {
        var pattern = /@media[\s\s]*?\}\s*\}/gi;
        var current = csstext.match(pattern);
        if (current != null) {
            for (var i = 0; i < current.length; i++) {
                csstext = csstext.replace(current[i], "");

                var mediacsstext = current[i].replace(/\n/g, "").replace(/\r/g, ""); // 去除回车换行
                mediacsstext = trim(mediacsstext);

                var minvalue = 0;
                var maxvalue = 0;

                var pt = /min-width[\s\s]*?\d*px/gi
                var min = mediacsstext.match(pt);
                if (min != null && min.length > 0) {
                    var minsplit = min[0].split(":");
                    var value = trim(minsplit[1]);
                    value = value.replace("px", "");
                    minvalue = parseint(value);
                }

                var ptmax = /max-width[\s\s]*?\d*px/gi
                var max = mediacsstext.match(ptmax);
                if (max != null && max.length > 0) {
                    var maxsplit = max[0].split(":");
                    var value = trim(maxsplit[1]);
                    value = value.replace("px", "");
                    maxvalue = parseint(value);
                }

                var start = mediacsstext.indexof("{");
                mediacsstext = mediacsstext.substring(start + 1, mediacsstext.length - 1);
                var csslist = parsecss(mediacsstext);
                mediacss.push({
                    minwidth: minvalue,
                    maxwidth: maxvalue,
                    precss: mediacsstext,
                    csslist: csslist,
                });
            }
        }
        return csstext;
    }


    // 构造所有css
    var buildallcss = function () {
        var width = $(window).width();
        var cssstr = "";
        for (var i = 0; i < allcsslist.length; i++) {
            cssstr += buildcss(width, allcsslist[i].csslist);
        }
        for (var j = 0; j < mediacss.length; mediacss++) {
            for (var i = 0; i < mediacss[j].length; i++) {
                if (mediacss[j][i].minwidth > 0 && mediacss[j][i].maxwidth > 0) {
                    if (mediacss[j][i].minwidth >= width && mediacss[j][i].maxwidth < width) {
                        cssstr += buildcss(width, mediacss[j][i].csslist);
                    }
                } else if (mediacss[j][i].minwidth > 0 && mediacss[j][i].maxwidth == 0) {
                    if (mediacss[j][i].minwidth >= width) {
                        cssstr += buildcss(width, mediacss[j][i].csslist);
                    }
                } else if (mediacss[j][i].minwidth == 0 && mediacss[j][i].maxwidth > 0) {
                    if (mediacss[j][i].maxwidth < width) {
                        cssstr += buildcss(width, mediacss[j][i].csslist);
                    }
                } else {
                    cssstr += buildcss(width, mediacss[j][i].csslist);
                }
            }
        }
        writecss(cssstr);
    }

    // 构造css
    var buildcss = function (width, csslist) {
        var radio = width / max_width;
        var csstext = "";
        for (var i = 0; i < csslist.length; i++) {
            csstext += csslist[i].classname + "{";
            for (var j = 0; j < csslist[i].attrlist.length; j++) {
                if (csslist[i].attrlist[j].key == "background") {
                    var url = csslist[i].attrlist[j].values[0].url;
                    url = url.replace(/\.\.\//g, "");
                    csstext += "filter: progid:dximagetransform.microsoft.alphaimageloader(src='" + url + "',sizingmethod='scale');";
                    csstext += "background:none\\9;";
                    csstext += "background:none\\8;";
                } else {
                    csstext += csslist[i].attrlist[j].key + ":";
                    var values = csslist[i].attrlist[j].values;
                    for (var z = 0; z < values.length; z++) {
                        if (values[z].ispx) {
                            var v = values[z].value * radio;
                            csstext += v + values[z].unit + " ";
                        } else {
                            csstext += values[z].value + values[z].unit + " ";
                        }
                    }
                }
                csstext += ";";
            }
            csstext += "}";
        }
        return csstext;
    }

    // 写css
    var writecss = function (csstext) {
        if (cssstyle == null) {
            cssstyle = document.createelement('style');
            cssstyle.setattribute('type', 'text/css');
            cssstyle.id = 'cssreplace';
            document.getelementsbytagname('head')[0].appendchild(cssstyle);
            csstextnode = document.createtextnode("");
            if (cssstyle.stylesheet) {
                cssstyle.stylesheet.csstext = csstext;
            } else {
                cssstyle.appendchild(csstextnode);
                csstextnode.textcontent = csstext;
            }
        } else {
            if (cssstyle.stylesheet) {
                cssstyle.stylesheet.csstext = csstext;
            } else {
                csstextnode.textcontent = csstext;
            }
        } 
    }


    function checkletie9() {
        var theua = window.navigator.useragent.tolowercase();
        if ((theua.match(/msie\s\d+/) && theua.match(/msie\s\d+/)[0]) || (theua.match(/trident\s?\d+/) &&
            theua.match(/trident\s?\d+/)[0])) {
            var ieversion = theua.match(/msie\s\d+/)[0].match(/\d+/)[0] || theua.match(/trident\s?\d+/)[0];
            if (ieversion <= 9) {
                return true; 
            } 
        }
        return false;
    }
    if(checkletie9()){ 
        processlinks();
    }

    window.console = window.console || (function () {
        var c ={}; 
    　　 c.log = c.warn = c.debug = c.info = c.error = c.time = c.dir = c.profile= c.clear = c.exception = c.trace = c.assert = function(){};
        return c;
    })();
    
})(window);