using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Xml.Linq;

namespace Neo.LegitimateLicences.Common
{
    public class OlasXmlHelper
    {
        #region GetActiveLicence
        public static OlasData GetActiveLicence(string sourceXml)
        {
            var list = GetLicences(sourceXml, true);

            return (list.Count() == 1) ? list.First() : null;
        } 
        #endregion

        #region GetLicences
        public static List<OlasData> GetLicences(string sourceXml, bool activeOnly = false)
        {
            var sourceXML = new XDocument();
            var list = new List<OlasData>();

            #region read XML from precheckDetail into sourceXML
            using (var stream = new MemoryStream())
            {
                using (var writer = new StreamWriter(stream))
                {
                    writer.Write(sourceXml);
                    writer.Flush();
                    stream.Position = 0;
                    if (stream.Length > 0)
                    {
                        sourceXML = XDocument.Load(stream);
                    }
                }
            }
            #endregion

            if (sourceXML != null)
            {
                var applications = sourceXML.Descendants("application");
                var applicant = new XElement("applicant");
                var vehicle = new XElement("vehicle");
                var relatedPermitNumber = "";
                var foundApplication = false;
                var issue = 1;

                foreach (var application in applications)
                {
                    foreach (var licence in application.Descendants("licence"))
                    {
                        var isActive = (licence.Element("active") != null) ? ((bool)licence.Element("active")) : false;
                        var licenceStatus = (licence.Element("licencestatus") != null) ? ((string)licence.Element("licencestatus")) : "";
                        var isUplifted = (licenceStatus.ToLower() == "uplifted");

                        applicant = application.Element("applicant");
                        vehicle = licence.Element("vehicle");

                        var olasData = new OlasData()
                        {
                            ApplicantIdNumber = (applicant != null && applicant.Element("idnumber") != null) ? (string)applicant.Element("idnumber") : "",
                            ApplicantName = (applicant != null && applicant.Element("firstname") != null && applicant.Element("lastname") != null) ? (string)applicant.Element("firstname") + " " + (string)applicant.Element("lastname") : "",
                            ApplicationDate = (applicant != null && application.Element("applicationdate") != null) ? (DateTime)application.Element("applicationdate") : new DateTime(1900, 1, 1),
                            ApplicationNumber = (applicant != null && application.Element("applicationnumber") != null) ? (string)application.Element("applicationnumber") : "",
                            LicenceActive = (licence != null && licence.Element("active") != null) ? (bool)licence.Element("active") : false,
                            LicenceCertificateNumber = (licence != null && licence.Element("certificatenumber") != null) ? (string)licence.Element("certificatenumber") : "",
                            LicenceDate = (licence != null && licence.Element("licencedate") != null) ? (DateTime)licence.Element("licencedate") : new DateTime(2020, 1, 1),
                            LicenceEndDate = (licence != null && licence.Element("enddate") != null) ? (DateTime)licence.Element("enddate") : new DateTime(2020, 1, 1),
                            LicenceStartDate = (licence != null && licence.Element("startdate") != null) ? (DateTime)licence.Element("startdate") : new DateTime(2020, 1, 1),                            
                            LicenceNumber = (licence != null && licence.Element("licencenumber") != null) ? (string)licence.Element("licencenumber") : "",
                            LicenceStatus = (licence != null && licence.Element("licencestatus") != null) ? (string)licence.Element("licencestatus") : "",
                            RelatedPermitNumber = (licence != null && licence.Element("relatedPermitNumber") != null && ((string)licence.Element("relatedPermitNumber")) != "") ? (string)licence.Element("relatedPermitNumber") : relatedPermitNumber,
                            VehicleChassisNumber = (vehicle != null && vehicle.Element("chassisnumber") != null) ? (string)vehicle.Element("chassisnumber") : "",
                            VehicleEngineNumber = (vehicle != null && vehicle.Element("enginenumber") != null) ? (string)vehicle.Element("enginenumber") : "",
                            VehicleMake = (vehicle != null && vehicle.Element("vehiclemake") != null) ? (string)vehicle.Element("vehiclemake") : "",
                            VehicleRegistrationNumber = (vehicle != null && vehicle.Element("registrationnumber") != null) ? (string)vehicle.Element("registrationnumber") : ""                            
                        };

                        olasData.LicenceIssueNumber = issue;
                        issue++;

                        if (licence.Element("relatedPermitNumber") != null)
                        {
                            relatedPermitNumber = (string)licence.Element("relatedPermitNumber");
                        }

                        if (activeOnly)
                        {
                            if (isActive && isUplifted)
                            {
                                list.Add(olasData);
                                foundApplication = true;
                                break;
                            }
                        }
                        else
                        {
                            list.Add(olasData);
                        }
                    }

                    if (foundApplication && activeOnly)
                    {
                        break;
                    }
                }
            }

            return list.OrderBy(a => a.ApplicationDate).ToList();
        } 
        #endregion
    }

    #region OlasData Class
    public class OlasData
    {
        public string ApplicationNumber { get; set; }
        public DateTime ApplicationDate { get; set; }
        public string ApplicantIdNumber { get; set; }
        public string ApplicantName { get; set; }
        public string LicenceNumber { get; set; }
        public string LicenceStatus { get; set; }
        public DateTime LicenceDate { get; set; }
        public DateTime LicenceStartDate { get; set; }
        public DateTime LicenceEndDate { get; set; }
        public int LicenceIssueNumber { get; set; }
        public string LicenceCertificateNumber { get; set; }
        public bool LicenceActive { get; set; }
        public string RelatedPermitNumber { get; set; }
        public string VehicleMake { get; set; }
        public string VehicleRegistrationNumber { get; set; }
        public string VehicleChassisNumber { get; set; }
        public string VehicleEngineNumber { get; set; }
    } 
    #endregion
}