odoo.define('web_editor.transcoder', function (require) {
'use strict';

var widget = require('web_editor.widget');

var rulesCache = [];
var getMatchedCSSRules = function (a) {
    if (!rulesCache.length) {
        var sheets = document.styleSheets;
        for(var i = sheets.length-1; i >= 0 ; i--) {
            var rules;
            if (sheets[i].rules) {
                rules = sheets[i].rules;
            } else {
                //try...catch because Firefox not able to enumerate document.styleSheets[].cssRules[] for cross-domain stylesheets.
                try {
                    rules = sheets[i].cssRules;
                } catch(e) {
                    console.warn("Can't read the css rules of: " + sheets[i].href, e);
                    continue;
                }
                rules = sheets[i].cssRules;
            }
            if (rules) {
                for(var r = rules.length-1; r >= 0; r--) {
                    var selectorText = rules[r].selectorText;
                    if (selectorText &&
                            rules[r].cssText &&
                            selectorText !== "*" &&
                            selectorText.indexOf(":hover") === -1 &&
                            selectorText.indexOf(":before") === -1 &&
                            selectorText.indexOf(":after") === -1 &&
                            selectorText.indexOf(":active") === -1 &&
                            selectorText.indexOf(":link") === -1 &&
                            selectorText.indexOf("::") === -1 &&
                            selectorText.indexOf("\"") === -1 &&
                            selectorText.indexOf("'") === -1) {
                        var st = selectorText.split(/\s*,\s*/);
                        for (var k=0; k<st.length; k++) {
                            rulesCache.push({ 'selector': st[k], 'style': rules[r].style });
                        }
                    }
                }
            }
        }
        rulesCache.reverse();
    }

    var css = [];
    a.matches = a.matches || a.webkitMatchesSelector || a.mozMatchesSelector || a.msMatchesSelector || a.oMatchesSelector;
    for(var r = 0; r < rulesCache.length; r++) {
        if (a.matches(rulesCache[r].selector)) {
            var style = rulesCache[r].style;
            if (style.parentRule) {
                var style_obj = {};
                for (var k=0, len=style.length; k<len; k++) {
                    if (style[k].indexOf('animation') !== -1) {
                        continue;
                    }
                    style_obj[style[k]] = style[style[k].replace(/-(.)/g, function (a, b) { return b.toUpperCase(); })];
                    if (new RegExp(style[k] + '\s*:[^:;]+!important' ).test(style.cssText)) {
                        style_obj[style[k]] += ' !important';
                    }
                }
                rulesCache[r].style = style = style_obj;
            }
            css.push([rulesCache[r].selector, style]);
        }
    }

    function specificity (selector) {
        // http://www.w3.org/TR/css3-selectors/#specificity
        var a = 0;
        selector = selector.replace(/#[a-z0-9_-]+/gi, function () { a++; return ""; });
        var b = 0;
        selector = selector.replace(/(\.[a-z0-9_-]+)|(\[.*?\])/gi, function () { b++; return ""; });
        var c = 0;
        selector = selector.replace(/(^|\s+|:+)[a-z0-9_-]+/gi, function (a) { if(a.indexOf(':not(')===-1) c++; return ""; });
        return a*100 + b*10 + c;
    }
    css.sort(function (a, b) { return specificity(a[0]) - specificity(b[0]); });

    var style = {};
    _.each(css, function (v,k) {
        _.each(v[1], function (v,k) {
            if (v && _.isString(v) && k.indexOf('-webkit') === -1 && (!style[k] || style[k].indexOf('important') === -1 || v.indexOf('important') !== -1)) {
                style[k] = v;
            }
        });
    });

    _.each(style, function (v,k) {
        if (v.indexOf('important') !== -1) {
            style[k] = v.slice(0, v.length-11);
        }
    });

    if (style.display === 'block') {
        delete style.display;
    }

    _.each(['margin', 'padding'], function(p) {
        if (style[p+'-top'] || style[p+'-right'] || style[p+'-bottom'] || style[p+'-left']) {
            if (style[p+'-top'] === style[p+'-right'] && style[p+'-top'] === style[p+'-bottom'] && style[p+'-top'] === style[p+'-left']) {
                // keep => property: [top/right/bottom/left value];
                style[p] = style[p+'-top'];
            }
            else {
                // keep => property: [top value] [right value] [bottom value] [left value];
                style[p] = (style[p+'-top'] || 0) + ' ' + (style[p+'-right'] || 0) + ' ' + (style[p+'-bottom'] || 0) + ' ' + (style[p+'-left'] || 0);
                if (style[p].indexOf('inherit') !== -1 || style[p].indexOf('initial') !== -1) {
                    // keep => property-top: [top value]; property-right: [right value]; property-bottom: [bottom value]; property-left: [left value];
                    delete style[p];
                    return;
                }
            }
            delete style[p+'-top'];
            delete style[p+'-right'];
            delete style[p+'-bottom'];
            delete style[p+'-left'];
        }
    });

    return style;
};

// convert font awsome into image
var font_to_img = function ($editable) {
    $editable.find(".fa").each(function () {
        var $font = $(this);
        var icon, content;
        _.find(widget.fontIcons, function (font) {
            return _.find(widget.getCssSelectors(font.parser), function (css) {
                if ($font.is(css[0].replace(/::?before$/, ''))) {
                    icon = css[2].split("-").shift();
                    content = css[1].match(/content:\s*['"]?(.)['"]?/)[1];
                    return true;
                }
            });
        });
        if (content) {
            var color = $font.css("color").replace(/\s/g, '');
            $font.replaceWith($("<img/>", {
                "src": _.str.sprintf('/web_editor/font_to_img/%s/%s/%s', content.charCodeAt(0), window.encodeURI(color), Math.max(1, $font.height())),
                "data-class": $font.attr("class"),
                "data-style": $font.attr("style"),
                "class": $font.attr("class").replace(new RegExp("(^|\\s+)" + icon + "(-[^\\s]+)?", "gi"), ''), // remove inline font-awsome style
                "style": $font.attr("style")
            }).css({height: "auto", width: "auto"}));
        } else {
            $font.remove();
        }
    });
};
// convert image into font awsome
var img_to_font = function ($editable) {
    $editable.find("img[src*='/web_editor/font_to_img/']").each(function () {
        var $img = $(this);
        $img.replaceWith($("<span/>", {
            "class": $img.data("class"),
            "style": $img.data("style")
        }));
    });
};

// convert class into inline style to send by mail
var class_to_style = function ($editable) {
    if (!rulesCache.length) {
        getMatchedCSSRules($editable[0]);
    }
    $editable.find('*').each(function () {
        var $target = $(this);
        var css = getMatchedCSSRules(this);
        var style = $target.attr("style") || "";
        _.each(css, function (v,k) {
            if (!(new RegExp('(^|;)\s*' + k).test(style))) {
                style = k+":"+v+";"+style;
            }
        });
        if (_.isEmpty(style)) {
            $target.removeAttr("style");
        } else {
            $target.attr("style", style);
        }
    });
};
// convert style into inline class from mail
var style_to_class = function ($editable) {
    getMatchedCSSRules($editable[0]);

    var $c = $('<span/>').appendTo("body");

    $editable.find('*').each(function () {
        var $target = $(this);
        var css = getMatchedCSSRules(this);
        var style = "";
        _.each(css, function (v,k) {
            if (!(new RegExp('(^|;)\s*' + k).test(style))) {
                style = k+":"+v+";"+style;
            }
        });
        css = ($c.attr("style", style).attr("style") || "").split(/\s*;\s*/);
        style = $target.attr("style") || "";
        _.each(css, function (v) {
            style = style.replace(v, '');
        });
        style = style.replace(/;+(\s;)*/g, ';').replace(/^;/g, '');
        if (style !== '') {
            $target.attr("style", style);
        } else {
            $target.removeAttr("style");
        }
    });
    $c.remove();
};

return {
    'font_to_img': font_to_img,
    'img_to_font': img_to_font,
    'class_to_style': class_to_style,
    'style_to_class': style_to_class,
};

});