/src/MvcFutures/Mvc/ImageExtensions.cs

namespace Microsoft.Web.Mvc {

    using System;

    using System.Collections.Generic;

    using System.Web;

    using System.Web.Mvc;

    using System.Web.Routing;

    using Microsoft.Web.Mvc.Resources;



    [AspNetHostingPermission(System.Security.Permissions.SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]

    public static class ImageExtensions {

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "1#", Justification = "The return value is not a regular URL since it may contain ~/ ASP.NET-specific characters")]

        public static string Image(this HtmlHelper helper, string imageRelativeUrl) {

            return Image(helper, imageRelativeUrl, null, (IDictionary<string, object>)null);

        }



        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "1#", Justification = "Required for Extension Method")]

        public static string Image(this HtmlHelper helper, string imageRelativeUrl, string alt) {

            return Image(helper, imageRelativeUrl, alt, (IDictionary<string, object>)null);

        }



        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "1#", Justification = "The return value is not a regular URL since it may contain ~/ ASP.NET-specific characters")]

        public static string Image(this HtmlHelper helper, string imageRelativeUrl, string alt, object htmlAttributes) {

            return Image(helper, imageRelativeUrl, alt, new RouteValueDictionary(htmlAttributes));

        }



        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "1#", Justification = "The return value is not a regular URL since it may contain ~/ ASP.NET-specific characters")]

        public static string Image(this HtmlHelper helper, string imageRelativeUrl, object htmlAttributes) {

            return Image(helper, imageRelativeUrl, null, new RouteValueDictionary(htmlAttributes));

        }



        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "1#", Justification = "The return value is not a regular URL since it may contain ~/ ASP.NET-specific characters")]

        public static string Image(this HtmlHelper helper, string imageRelativeUrl, IDictionary<string, object> htmlAttributes) {

            return Image(helper, imageRelativeUrl, null, htmlAttributes);

        }



        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "1#", Justification = "The return value is not a regular URL since it may contain ~/ ASP.NET-specific characters")]

        public static string Image(this HtmlHelper helper, string imageRelativeUrl, string alt, IDictionary<string, object> htmlAttributes) {

            if (String.IsNullOrEmpty(imageRelativeUrl)) {

                throw new ArgumentException(MvcResources.Common_NullOrEmpty, "imageRelativeUrl");

            }



            UrlHelper url = new UrlHelper(helper.ViewContext);

            string imageUrl = url.Content(imageRelativeUrl);

            return Image(imageUrl, alt, htmlAttributes).ToString(TagRenderMode.SelfClosing);

        }



        public static TagBuilder Image(string imageUrl, string alt, IDictionary<string, object> htmlAttributes) {

            if (String.IsNullOrEmpty(imageUrl)) {

                throw new ArgumentException(MvcResources.Common_NullOrEmpty, "imageUrl");

            }



            TagBuilder imageTag = new TagBuilder("img");



            if (!String.IsNullOrEmpty(imageUrl)) {

                imageTag.MergeAttribute("src", imageUrl);

            }



            if (!String.IsNullOrEmpty(alt)) {

                imageTag.MergeAttribute("alt", alt);

            }



            imageTag.MergeAttributes(htmlAttributes, true);



            if (imageTag.Attributes.ContainsKey("alt") && !imageTag.Attributes.ContainsKey("title")) {

                imageTag.MergeAttribute("title", (imageTag.Attributes["alt"] ?? "").ToString());

            }

            return imageTag;

        }

    }

}