StylesheetSelector = {
    $enable: $('a[data-action="enable-alternate-style"]'),
    $disable: $('a[data-action="disable-alternate-style"]')
};

StylesheetSelector.changeContraste = function (alternate) {
    if (alternate) {
        $("link[rel='alternate stylesheet']").prop('disabled', false);
        $("link[rel='alternate stylesheet']").prop('disabled', true);
        $("link[rel='alternate stylesheet']").prop('disabled', false);
    } else {
        $("link[rel='alternate stylesheet']").prop('disabled', true);
    }
}

StylesheetSelector.init = function () {
    this.$enable.on("click", function (e) {        
        StylesheetSelector.createCookie("style.matriz.alternate", true, 365);
        StylesheetSelector.changeButtons(true);
        StylesheetSelector.changeContraste(true);
        console.log('exibe alto contraste');
    });

    this.$disable.on("click", function (e) {        
        StylesheetSelector.createCookie("style.matriz.alternate", false, 365);
        StylesheetSelector.changeButtons(false);
        StylesheetSelector.changeContraste(false);
        console.log('exibe contraste normal');
    });

    var alternate = StylesheetSelector.readCookie("style.matriz.alternate");
    alternate = (alternate === 'true');
    StylesheetSelector.changeButtons(alternate);
    StylesheetSelector.changeContraste(alternate);
};

StylesheetSelector.changeButtons = function (active) {
    var value = "disabled";
    if (active) {
        this.$enable.hide();
        this.$disable.show();
        value = null;
    } else {
        this.$disable.hide();
        this.$enable.show();
    }
};

StylesheetSelector.createCookie = function (name, value, daes) {
    if (daes) {
        var date = new Date();
        date.setTime(date.getTime() + (daes * 24 * 60 * 60 * 1000));
        var expires = "; expires=" + date.toGMTString();
    } else
        expires = "";
    document.cookie = name + "=" + value + expires + "; path=/";
};

StylesheetSelector.readCookie = function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for (var i = 0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) === ' ')
            c = c.substring(1, c.length);
        if (c.indexOf(nameEQ) === 0)
            return c.substring(nameEQ.length, c.length);
    }
    return null;
};

StylesheetSelector.fast = function () {
    var alternate = StylesheetSelector.readCookie("style.matriz.alternate");
    alternate = (alternate === 'true');
    StylesheetSelector.changeContraste(alternate);
};
StylesheetSelector.fast();

window.addEventListener("load", function () {
    StylesheetSelector.init();
});