Image Utilities

app.factory('Utilities', function ($q) {
    return {
        isImage: function (src) {
            var deferred = $q.defer();

            var image = new Image();
            image.onerror = function () {
                deferred.resolve(false);
            };
            image.onload = function () {
                deferred.resolve(true);
            };
            image.src = src;

            return deferred.promise;
        },
        replaceURLWithLink: function (text) {
            var expression = /(\b(https?):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig;
            return text.replace(expression, "<a href='$1' target='_blank'>$1</a>");
        },
        replaceURLWithImg: function (text) {
            var expression = /(\b(https?):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig;
            return text.replace(expression, "<a href='$1' target='_blank'><img src='$1' hieght='80' width='80' /></a>");
        },
        ProcessLinks: function (message) {
            var _self = this;
            var expression = /(\b(https?):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig;
            var matches = message.match(expression);
            if (matches[0].trim.length == message.trim.length) {
                _self.isImage(message).then(function() {
                    return _self.replaceURLWithImg(message);
                });
                return _self.replaceURLWithLink(message);
            }
            return message;
        },
        HasLink: function (message) {
            var expression = /(\b(https?):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig;
            return message.match(expression) && message.match(expression).length > 0;
        }

    };
});