using CPE.App.Api.Models;
using CPE.App.Web.Code;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Newtonsoft.Json;

namespace CPE.App.Api.Helpers
{
    public class TinCanHelper
    {
        public static bool HandleStatement(TinCanStatementModel statement)
        {
            // statement.Verb.Id=http://adlnet.gov/expapi/verbs/answered
            // statement.Verb.Id=http://adlnet.gov/expapi/verbs/experienced
            var dtNow = DateTime.UtcNow.ToString("yyyyMMdd_HHmmss");
            if (statement.Verb.Id.IndexOf("passed")>-1)
            {
                Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} statement.Verb.Id={1}. statement={2}", dtNow, statement.Verb.Id, JsonConvert.SerializeObject(statement));

                //parse statement to db variables
                var email = statement.Actor.Mbox.Substring(7);
                var fname = statement.Actor.Name.Substring(0, statement.Actor.Name.IndexOf(" ") + 1);
                var lname = statement.Actor.Name.Substring(statement.Actor.Name.LastIndexOf(" ") + 1);
                var courseUrl = statement.Object.Id.Substring(statement.Object.Id.LastIndexOf("/") + 1);
                var courseName = statement.Object.Definition.Name.EnUs;
                bool done;

                //cpe has test data with multiple, currently valid purchases of the same course for one user, which causes problems but is not a real-world problem.
                //elucidat tracks all users globally by email address so a tincan statement won't identify a specific purchase here 
                //unless we create unique email addy (e.g. email+ticket@mail.com) when originally logging them in to content
                var course = BaseController.Database.PurchasedCourses.FirstOrDefault(c =>
                    c.Email == email && c.ContentUrl == courseUrl && c.CertificateDate == null);
                if (course == null)
                {
                    Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} no action 1, cert already earned email={1} courseName={2}", dtNow, email, courseName);
                    //no action, cert already earned
                    //try
                    //{
                    //    course = BaseController.Database.PurchasedCourses.FirstOrDefault(c => c.Email == email && c.ContentUrl == courseUrl && c.CertificateDate!=null);
                    //    if (course == null)
                    //    {
                    //        Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} no action, course == null, select courseName={1} from db with CertificateDate.", dtNow, courseName);
                    //    }

                    //    Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} no action, select courseName={1} from db with CertificateDate. course={2}", dtNow,  courseName, JsonConvert.SerializeObject(course));

                    //    done = SendEmailHelper.SendCertificateEmail(course);

                    //    Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} no action, send courseName={1} from db to email={2} successfully", dtNow, courseName, email);
                    //}
                    //catch (Exception exception)
                    //{
                    //    var innerException = "";
                    //    if (exception.InnerException != null) innerException = exception.InnerException.ToString();
                    //    Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} email={1} courseName={2} exception={3}", dtNow, email, courseName, exception.ToString()+ innerException);
                    //}

                    //Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} cert sent email={1} courseName={2}", dtNow, email, courseName);

                    return true;
                }

                course.CertificateDate = Convert.ToDateTime(statement.Timestamp);
                try
                {
                    BaseController.Database.SubmitChanges();
                }
                catch (Exception exception)
                {
                    Utilities.LogWrapper.Error("[TinCanHelper][HandleStatement] {0} email={1} courseName={2} exception={3}", dtNow, email, courseName, exception.ToString());
                }

                done = SendEmailHelper.SendCertificateEmail(course);

                Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} cert sent email={1} courseName={2}", dtNow, email, courseName);

                //umm why am i not returning done here? 
                return true;
            }


            if (statement.Verb.Id.IndexOf("failed") > -1)
            {
                Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} statement.Verb.Id={1}. statement={2}", dtNow, statement.Verb.Id, JsonConvert.SerializeObject(statement));

                //parse statement to db variables
                var email = statement.Actor.Mbox.Substring(7);
                var fname = statement.Actor.Name.Substring(0, statement.Actor.Name.IndexOf(" ") + 1);
                var lname = statement.Actor.Name.Substring(statement.Actor.Name.LastIndexOf(" ") + 1);
                var courseUrl = statement.Object.Id.Substring(statement.Object.Id.LastIndexOf("/") + 1);
                var courseName = statement.Object.Definition.Name.EnUs;

                //only logging failed attempts prior to earning a cert
                //selecting first record for a user for a course that is not expired. To allow for if a user fails to earn a cert within a year and re-purchases course

                var course = BaseController.Database.PurchasedCourses.FirstOrDefault(c => c.Email == email && c.ContentUrl == courseUrl && c.CertificateDate == null && ((c.PurchaseDate).AddYears(1)) > DateTime.UtcNow);
                if (course == null)
                {
                    //no action, cert already earned
                    return true;
                }

                Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} course.Ticket={1}", dtNow, course.Ticket);

                if (!course.FailedAttempts.HasValue)
                {
                    course.FailedAttempts = 0;
                }
                course.FailedAttempts++;
                try
                {
                    BaseController.Database.SubmitChanges();
                }
                catch (Exception exception)
                {
                    Utilities.LogWrapper.Error("[TinCanHelper][HandleStatement] {0} email={1} courseName={2} exception={3}", dtNow, email, courseName, exception.ToString());
                }

                Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} failure recorded email={1} courseName={2}", dtNow, email, courseName);

                return true;
            }
            return true;
        }
    }
}