// HTML Truncator for jQuery
// by Henrik Nyh <http://henrik.nyh.se> 2008-02-28.
// Free to modify and redistribute with credit.

;(function($) {

    var trailing_whitespace = true;

    $.fn.truncate = function(options) {

        var opts = $.extend({}, $.fn.truncate.defaults, options);

        $(this).each(function() {

            var content_length = $.trim(squeeze($(this).text())).length;
            if (content_length <= opts.max_length)
                return;  // bail early if not overlong

            var actual_max_length = opts.max_length - opts.more.length - 3;  // 3 for " ()"    
            var truncated_node = recursivelyTruncate(this, actual_max_length);
            var full_node = $(this);

            truncated_node.insertAfter(full_node);
            // This is an ugly approximation for getting the last block tag:
            // we just pick the last <p> or else the container itself.

            if (opts.showLinks == true) {
                truncated_node.find('p:last').add(truncated_node).eq(0).
                    append(' <a href="#show more content">' + opts.more + '</a>');

                full_node.hide();
                full_node.find('p:last').add(full_node).eq(0).
                    append(' <a href="#show less content">' + opts.less + '</a>');

                truncated_node.find('a:last').click(function() {
                    truncated_node.hide(); full_node.show(); return false;
                });
                full_node.find('a:last').click(function() {
                    truncated_node.show(); full_node.hide(); return false;
                });
            }
            else {
                truncated_node.find('p:last').add(truncated_node).eq(0).
                    append('  <span style="color:Blue;">' +  opts.more + '</span>');

                full_node.hide();                
            }

        });
    }

    // Note that the "more" link and its wrapping counts towards the max length:
    // so "more" and a max length of 10 might give "123 (more)"
    $.fn.truncate.defaults = {
        max_length: 100,
        more: ' more...',
        less: 'less',
        showLinks: true
    };

    function recursivelyTruncate(node, max_length) {
        return (node.nodeType == 3) ? truncateText(node, max_length) : truncateNode(node, max_length);
    }

    function truncateNode(node, max_length) {
        var node = $(node);
        var new_node = node.clone().html("");
        node.contents().each(function() {
            var remaining_length = max_length - new_node.text().length;
            if (remaining_length == 0) return;
            new_node.append(recursivelyTruncate(this, remaining_length));
        });
        return new_node;
    }

    function truncateText(node, max_length) {
        var text = squeeze(node.data);
        if (trailing_whitespace)  // remove initial whitespace if last text
            text = text.replace(/^ /, '');  // node had trailing whitespace.
        trailing_whitespace = !!text.match(/ $/);
        var text = text.slice(0, max_length);
        // Ensure HTML entities are encoded
        // http://debuggable.com/posts/encode-html-entities-with-jquery:480f4dd6-13cc-4ce9-8071-4710cbdd56cb
        text = $('<div/>').text(text).html();
        return text;
    }

    // Collapses a sequence of whitespace into a single space.
    function squeeze(string) {
        return string.replace(/\s+/g, ' ');
    }

})(jQuery);