angular.module('AdobePublishForCMS.directives', [])

.directive('ngThumb', ['$window', function($window) {
    var helper = {
        support: !!($window.FileReader && $window.CanvasRenderingContext2D),
        isFile: function(item) {
            return angular.isObject(item) && item instanceof $window.File;
        },
        isImage: function(file) {
            var type =  '|' + file.type.slice(file.type.lastIndexOf('/') + 1) + '|';
            return '|jpg|png|jpeg|bmp|gif|'.indexOf(type) !== -1;
        }
    };

    return {
        restrict: 'A',
        template: '<canvas/>',
        link: function(scope, element, attributes) {
            if (!helper.support) return;

            var params = scope.$eval(attributes.ngThumb);

            if (!helper.isFile(params.file)) return;
            if (!helper.isImage(params.file)) return;

            var canvas = element.find('canvas');
            var reader = new FileReader();

            reader.onload = onLoadFile;
            reader.readAsDataURL(params.file);

            function onLoadFile(event) {
                var img = new Image();
                img.onload = onLoadImage;
                img.src = event.target.result;
            }

            function onLoadImage() {
                var width = params.width || this.width / this.height * params.height;
                var height = params.height || this.height / this.width * params.width;
                canvas.attr({ width: width, height: height });
                canvas[0].getContext('2d').drawImage(this, 0, 0, width, height);
            }
        }
    };
}])

.directive('ngEnter', function() {
    return function(scope, element, attrs) {
        element.bind("keydown keypress", function(event) {
            if(event.which === 13) {
                scope.$apply(function(){
                    scope.$eval(attrs.ngEnter, {'event': event});
                });

                event.preventDefault();
            }
        });
    };
});