/*
 * Code/Mandrill.cs
 * These are calls to the Mandrill email service.
 * Reference: https://mandrillapp.com/api/docs/
 * 
 * ajh 2012-08-09: new
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Configuration;
using System.Dynamic;
using EasyHttp.Http;
using System.Net;
using log4net;

namespace Sample.Web
{
    enum MandrillError
    {
        OK,
        WebException,
        HttpNotOk,
        Invalid,
        Rejected,
        Unknown
    }

    public class Mandrill
    {
        static string MandrillBaseUrl = ConfigurationManager.AppSettings["MandrillBaseUrl"];
        static Guid MandrillKey = new Guid(ConfigurationManager.AppSettings["MandrillKey"]);

        public static bool SendActivationEMail(BLL.TrialSignup ts, out string errorMsg)
        {
            string activationLink =
                HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Authority) + "/Register/Activation.aspx?id=" + ts.Id;
            
            //send-template(string key, string template_name, array template_content, struct message) 
            dynamic sendParams = new ExpandoObject();
            sendParams.key = MandrillKey;
            sendParams.template_name = "Secret Project Trial Activation";

            sendParams.template_content = new List<dynamic>();
            
            sendParams.message = new ExpandoObject();
            sendParams.message.subject = "Here's your Secret Project activation email";
            sendParams.message.from_email = "info@SecretProject.com";
            sendParams.message.from_name = "Secret Project";

            sendParams.message.to = new List<dynamic>();
            sendParams.message.to.Add(new ExpandoObject());
            sendParams.message.to[0].email = ts.EMail;
            sendParams.message.to[0].name = ts.Name;

            sendParams.message.track_opens = true;
            //sendParams.message.track_clicks = true;

            sendParams.message.global_merge_vars = new List<dynamic>();
            sendParams.message.global_merge_vars.Add(new ExpandoObject());
            sendParams.message.global_merge_vars[0].name = "NAME";
            sendParams.message.global_merge_vars[0].content = ts.Name;

            sendParams.message.global_merge_vars.Add(new ExpandoObject());
            sendParams.message.global_merge_vars[1].name = "LINK";
            sendParams.message.global_merge_vars[1].content = activationLink;

            errorMsg = string.Empty;
            
            MandrillError merr = SendMessage(sendParams);

            switch (merr)
            {
                case MandrillError.OK:
                    return true;
                case MandrillError.WebException:
                case MandrillError.HttpNotOk:
                    errorMsg = "There was an issue sending your activation e-mail. Please try again later or call us directly.";
                    break;
                case MandrillError.Invalid:
                    errorMsg = "Your email address appears to be invalid. Please try again with a valid address, or call us directly.";
                    break;
                case MandrillError.Rejected:
                    errorMsg = "Your activation email was rejected. Please try again with a valid address, or call us directly.";
                    break;
                case MandrillError.Unknown:
                    errorMsg = "There was an unknown problem sending your activation email. Please try again, or call us directly.";
                    break;
            }
            return false;
        }

        public static bool SendSalesNotification(BLL.TrialSignup ts)
        {
            dynamic sendParams = new ExpandoObject();
            sendParams.key = MandrillKey;
            sendParams.template_name = "Secret Project Trial Sales Notification";

            sendParams.template_content = new List<dynamic>();

            sendParams.message = new ExpandoObject();
            sendParams.message.subject = "Secret Project Trial Account Notification";
            sendParams.message.from_email = "info@SecretProject.com";
            sendParams.message.from_name = "Secret Project";

            sendParams.message.to = new List<dynamic>();
            sendParams.message.to.Add(new ExpandoObject());
            sendParams.message.to[0].email = ConfigurationManager.AppSettings["SalesEmail"];
            sendParams.message.to[0].name = "Secret Project Sales";

            //sendParams.message.track_opens = true;
            //sendParams.message.track_clicks = true;

            sendParams.message.global_merge_vars = new List<dynamic>();
            sendParams.message.global_merge_vars.Add(new ExpandoObject());
            sendParams.message.global_merge_vars[0].name = "NAME";
            sendParams.message.global_merge_vars[0].content = ts.Name;

            sendParams.message.global_merge_vars.Add(new ExpandoObject());
            sendParams.message.global_merge_vars[1].name = "COMPANY";
            sendParams.message.global_merge_vars[1].content = ts.CompanyName;
            
            sendParams.message.global_merge_vars.Add(new ExpandoObject());
            sendParams.message.global_merge_vars[2].name = "EMAIL";
            sendParams.message.global_merge_vars[2].content = ts.EMail;

            MandrillError merr = SendMessage(sendParams);

            switch (merr)
            {
                case MandrillError.OK:
                    return true;
                case MandrillError.WebException:
                case MandrillError.HttpNotOk:
                case MandrillError.Invalid:
                case MandrillError.Rejected:
                case MandrillError.Unknown:
                    break;
            }
            return false;
        }

        private static MandrillError SendMessage(dynamic sendParams)
        {
            ILog _log = log4net.LogManager.GetLogger("Mandrill/SendMessage");

            string url = MandrillBaseUrl + "/messages/send-template.json";

            var http = new HttpClient
            {
                Request = { Accept = HttpContentTypes.ApplicationJson }
            };

            EasyHttp.Http.HttpResponse response;
            try
            {
                response = http.Post(url, sendParams, HttpContentTypes.ApplicationJson);
            }
            catch (WebException ex)
            {
                _log.ErrorFormat("Error: WebException - {0}", ex.Message);
                return MandrillError.WebException;
            }

            if (response.StatusCode != HttpStatusCode.OK)
            {
                _log.InfoFormat("Response = {0} - {1}", response.StatusCode, response.StatusDescription);
                _log.Info(response.RawText);
                return MandrillError.HttpNotOk;
            }

            dynamic rv = response.DynamicBody;
            _log.InfoFormat("email: {0}, status: {1}", rv[0].email, rv[0].status);

            string send_status = rv[0].status;
            if (send_status == "sent" || send_status == "queued")
                return MandrillError.OK;

            // otherwise, it should be "rejected" or "invalid"
            if (send_status == "invalid")
            {
                return MandrillError.Invalid;
            }
            if (send_status == "rejected")
            {
                return MandrillError.Rejected;
            }

            // unexpected...
            return MandrillError.Unknown;
        }
        
    }
}