/src/MvcFutures/Mvc/MailToExtensions.cs

namespace Microsoft.Web.Mvc {

    using System;

    using System.Linq;

    using System.Collections.Generic;

    using System.Web;

    using System.Web.Mvc;

    using System.Web.Routing;



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

    public static class MailToExtensions {

        public static string Mailto(this HtmlHelper helper, string linkText, string emailAddress) {

            return Mailto(helper, linkText, emailAddress, null, null, null, null, (IDictionary<string, object>)null);

        }



        public static string Mailto(this HtmlHelper helper, string linkText, string emailAddress, object htmlAttributes) {

            return Mailto(helper, linkText, emailAddress, null, null, null, null, htmlAttributes);

        }



        public static string Mailto(this HtmlHelper helper, string linkText, string emailAddress, IDictionary<string, object> htmlAttributes) {

            return Mailto(helper, linkText, emailAddress, null, null, null, null, htmlAttributes);

        }



        public static string Mailto(this HtmlHelper helper, string linkText, string emailAddress, string subject) {

            return Mailto(helper, linkText, emailAddress, subject, null, null, null, (IDictionary<string, object>)null);

        }



        public static string Mailto(this HtmlHelper helper, string linkText, string emailAddress, string subject, object htmlAttributes) {

            return Mailto(helper, linkText, emailAddress, subject, null, null, null, htmlAttributes);

        }



        public static string Mailto(this HtmlHelper helper, string linkText, string emailAddress, string subject, IDictionary<string, object> htmlAttributes) {

            return Mailto(helper, linkText, emailAddress, subject, null, null, null, htmlAttributes);

        }



        public static string Mailto(this HtmlHelper helper, string linkText, string emailAddress, string subject, string body, string cc, string bcc, object htmlAttributes) {

            return Mailto(helper, linkText, emailAddress, subject, body, cc, bcc, new RouteValueDictionary(htmlAttributes));

        }



        public static string Mailto(this HtmlHelper helper, string linkText, string emailAddress, string subject,

            string body, string cc, string bcc, IDictionary<string, object> htmlAttributes) {

            if (emailAddress == null) {

                throw new ArgumentNullException("emailAddress"); // TODO: Resource message

            }

            if (linkText == null) {

                throw new ArgumentNullException("linkText"); // TODO: Resource message

            }



            

            string mailToUrl = "mailto:" + emailAddress;



            List<string> mailQuery = new List<string>();

            if (!String.IsNullOrEmpty(subject)) {

                mailQuery.Add("subject=" + helper.Encode(subject));

            }



            if (!String.IsNullOrEmpty(cc)) {

                mailQuery.Add("cc=" + helper.Encode(cc));

            }



            if (!String.IsNullOrEmpty(bcc)) {

                mailQuery.Add("bcc=" + helper.Encode(bcc));

            }



            if (!String.IsNullOrEmpty(body)) {

                string encodedBody = helper.Encode(body);

                encodedBody = encodedBody.Replace(Environment.NewLine, "%0A");

                mailQuery.Add("body=" + encodedBody);

            }



            string query = string.Empty;

            for (int i = 0; i < mailQuery.Count; i++) {

                query += mailQuery[i];

                if (i < mailQuery.Count - 1) {

                    query += "&";

                }

            }

            if (query.Length > 0) {

                mailToUrl += "?" + query;

            }



            TagBuilder mailtoAnchor = new TagBuilder("a");

            mailtoAnchor.MergeAttribute("href", mailToUrl);

            mailtoAnchor.MergeAttributes(htmlAttributes, true);

            mailtoAnchor.InnerHtml = linkText;

            return mailtoAnchor.ToString();

        }



        

    }

}