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

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

            if (statement.Verb.Id.IndexOf("passed")>-1)
            {
                Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} statement.Verb.Id={1}", DateTime.UtcNow.ToString("yyyyMMdd_HHmmss"), statement.Verb.Id);

                //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;

                //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, cert already earned email={1} courseName={2}", DateTime.UtcNow.ToString("yyyyMMdd_HHmmss"), email, courseName);
                    //no action, cert already earned
                    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}", DateTime.UtcNow.ToString("yyyyMMdd_HHmmss"), email, courseName, exception.ToString());
                }

                var done = SendEmailHelper.SendCertificateEmail(course);

                Utilities.LogWrapper.Info("[TinCanHelper][HandleStatement] {0} cert sent email={1} courseName={2}", DateTime.UtcNow.ToString("yyyyMMdd_HHmmss"), 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}", DateTime.UtcNow.ToString("yyyyMMdd_HHmmss"), statement.Verb.Id);

                //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}", DateTime.UtcNow.ToString("yyyyMMdd_HHmmss"), 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}", DateTime.UtcNow.ToString("yyyyMMdd_HHmmss"), email, courseName, exception.ToString());
                }

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

                return true;
            }
            return true;
        }
    }
}