// Copyright (c) 2015-2017 schick Informatik
// Description: Benutzerobjekt (erweitert um eigene Zwecke..)

using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Text;
using System.Security.Cryptography;
using System.ComponentModel;

namespace bsmd.database
{
    public class ReportingParty : DatabaseEntity
    {

        #region Enums

        public enum LogonResult
        {
            OK,
            FAILED,
            USERUKN
        }

        public enum ReportingPartyTypeEnum
        { MASTER, SHIPOWNER, CHARTERER, AGENT, PORT_AUTHORITY, CARRIER, OTHERS }

        public enum ShipcallDisplayModeEnum
        {
            [Description("Classic display")]
            CLASSIC,
            [Description("New formsheet display")]
            FORMSHEET
        }

        [Flags]
        internal enum UserFlags : int
        {
            /// <summary>
            /// "normaler" Anwender
            /// </summary>
            NONE = 0,
            /// <summary>
            /// Dieser Anwender "sieht" die Benutzerverwaltung
            /// </summary>
            ADMIN = 1,
            /// <summary>
            /// "gelöschte" Benutzer (inaktiv)
            /// </summary>
            ARCHIVED = 2,
            /// <summary>
            /// System-User (Testing, Tool)
            /// </summary>
            SYSTEM = 4,
            /// <summary>
            /// kann bestimmte Dinge (e.g. templates) im ENI bearbeiten
            /// </summary>
            EDITOR = 8,
            /// <summary>
            /// Beim Klick auf einen Anlauf soll sich per default die "neue" Formansicht öffnen
            /// </summary>
            DEFAULTFORMVIEW = 16
        };

        #endregion

        public ReportingParty()
        {
            this.tablename = "[dbo].[ReportingParty]";
        }

        #region Properties

        #region NSW Reporting Party Properties

        [MaxLength(100)]
        [ENI2Validation]
        public string Name { get; set; }

        [MaxLength(100)]
        [ENI2Validation]
        public string StreetAndNumber { get; set; }

        [MaxLength(25)]
        [ENI2Validation]
        public string PostalCode { get; set; }

        [MaxLength(100)]
        [ENI2Validation]
        public string City { get; set; }

        [MaxLength(100)]
        [ENI2Validation]
        public string Country { get; set; }

        [MaxLength(100)]
        [ENI2Validation]
        public string LastName { get; set; }

        [MaxLength(100)]
        [ENI2Validation]
        public string FirstName { get; set; }

        [MaxLength(100)]
        [ENI2Validation]
        public string Phone { get; set; }

        [MaxLength(100)]
        [ENI2Validation]
        public string Fax { get; set; }

        [MaxLength(100)]
        [ENI2Validation]
        public string EMail { get; set; }

        public ReportingPartyTypeEnum? ReportingPartyType { get; set; }

        /// <summary>
        /// Reference to current user (for data history)
        /// </summary>
        public static ReportingParty CurrentReportingParty { get; set; }

        #endregion

        #region ENI Logon User Properties

        /// <summary>
        /// login ID (=idealerweise dasselbe wie im AD!)
        /// </summary>
        public string Logon { get; set; }

        /// <summary>
        /// Personal / OTRS / User Email
        /// </summary>
        [MaxLength(100)]
        public string UserEMail { get; set; }

        /// <summary>
        /// SHA 512
        /// </summary>
        public string PasswordHash { get; set; }

        /// <summary>
        /// We know it's safer that way ;-)
        /// </summary>
        public string Salt { get; set; }

        public DateTime? Created { get; private set; }

        public DateTime? Changed { get; private set; }

        public int Flags { get; set; }

        public int Deleted { get; set; }

        #region User Properties

        public bool IsArchived
        {
            get { return (this.Flags & (int)UserFlags.ARCHIVED) != 0; }
            set { this.SetUserFlag(value, UserFlags.ARCHIVED); }
        }

        public bool IsSystemUser
        {
            get { return (this.Flags & (int)UserFlags.SYSTEM) != 0; }
            set { this.SetUserFlag(value, UserFlags.SYSTEM); }
        }

        public bool IsAdmin
        {
            get { return (this.Flags & (int)UserFlags.ADMIN) != 0; }
            set { this.SetUserFlag(value, UserFlags.ADMIN); }
        }

        public bool IsEditor
        {
            get { return (this.Flags & (int)UserFlags.EDITOR) != 0; }
            set { this.SetUserFlag(value, UserFlags.EDITOR); }
        }

        public ShipcallDisplayModeEnum ShipcallDisplayMode
        {
            get
            {
                if ((this.Flags & (int)UserFlags.DEFAULTFORMVIEW) != 0) return ShipcallDisplayModeEnum.FORMSHEET;
                else return ShipcallDisplayModeEnum.CLASSIC;
            }
            set
            {
                this.SetUserFlag(value != ShipcallDisplayModeEnum.CLASSIC, UserFlags.DEFAULTFORMVIEW);                
            }
        }

        #endregion

        #endregion

        #endregion

        #region overrides

        public override string ToString()
        {
            return this.Name;
        }

        #endregion

        #region IDatabaseEntity implementation

        public override void PrepareSave(System.Data.IDbCommand cmd)
        {
            SqlCommand scmd = cmd as SqlCommand;
            
            scmd.Parameters.AddWithNullableValue("@P2", this.Name);
            scmd.Parameters.AddWithNullableValue("@P3", this.StreetAndNumber);
            scmd.Parameters.AddWithNullableValue("@P4", this.PostalCode);
            scmd.Parameters.AddWithNullableValue("@P5", this.City);
            scmd.Parameters.AddWithNullableValue("@P6", this.Country);
            scmd.Parameters.AddWithNullableValue("@P7", this.LastName);
            scmd.Parameters.AddWithNullableValue("@P8", this.FirstName);
            scmd.Parameters.AddWithNullableValue("@P9", this.Phone);
            scmd.Parameters.AddWithNullableValue("@P10", this.Fax);
            scmd.Parameters.AddWithNullableValue("@P11", this.EMail);
            scmd.Parameters.AddWithNullableValue("@P12", this.Logon);            
            scmd.Parameters.AddWithNullableValue("@P13", this.PasswordHash);
            scmd.Parameters.AddWithNullableValue("@P14", this.Salt);
            scmd.Parameters.AddWithNullableValue("@P15", this.Flags);
            scmd.Parameters.AddWithNullableValue("@P16", this.Deleted);
            scmd.Parameters.AddWithNullableValue("@P17", this.UserEMail);

            if (this.IsNew)
            {
                this.CreateId();
                scmd.Parameters.AddWithValue("@ID", this.Id);
                scmd.CommandText = string.Format("INSERT INTO {0} (Id, RPName, RPStreetAndNumber, RPPostalCode, RPCity, RPCountry, " +
                    "RPLastName, RPFirstName, RPPhone, RPFax, RPEMail, Logon, PasswordHash, Salt, Flags, EMail) VALUES " +
                    "( @ID, @P2, @P3, @P4, @P5, @P6, @P7, @P8, @P9, @P10, @P11, @P12, @P13, @P14, @P15, @P17 )", this.Tablename);
            }
            else
            {
                scmd.Parameters.AddWithValue(@"ID", this.Id);
                scmd.CommandText = string.Format("UPDATE {0} SET RPName = @P2, RPStreetAndNumber = @P3,  RPPostalCode = @P4, " +
                    "RPCity = @P5, RPCountry = @P6, RPLastName = @P7, RPFirstName = @P8, RPPhone = @P9, RPFax = @P10, " +
                    "RPEMail = @P11, Logon = @P12, PasswordHash = @P13, Salt= @P14, Flags = @P15, Deleted = @P16, EMail = @P17 WHERE Id = @ID", this.Tablename);
            }
        }        

        public override void PrepareLoadCommand(System.Data.IDbCommand cmd, Message.LoadFilter filter, params object[] criteria)
        {

            string query = string.Format("SELECT Id, RPName, RPStreetAndNumber, RPPostalCode, RPCity, RPCountry, RPLastName, " +
                "RPFirstName, RPPhone, RPFax, RPEMail, Logon, PasswordHash, Salt, Created, Changed, Flags, Deleted, EMail FROM {0} ", this.Tablename);

            switch (filter)
            {
                case Message.LoadFilter.NOT_DELETED:
                    query += " WHERE Deleted = 0";
                    break;

                case Message.LoadFilter.ALL:
                default:
                    break;
            }

            cmd.CommandText = query;

        }

        public override List<DatabaseEntity> LoadList(System.Data.IDataReader reader)
        {
            List<DatabaseEntity> result = new List<DatabaseEntity>();
            while (reader.Read())
            {
                ReportingParty rp = new ReportingParty();

                rp.id = reader.GetGuid(0);
                if (!reader.IsDBNull(1)) rp.Name = reader.GetString(1);
                if (!reader.IsDBNull(2)) rp.StreetAndNumber = reader.GetString(2);
                if (!reader.IsDBNull(3)) rp.PostalCode = reader.GetString(3);
                if (!reader.IsDBNull(4)) rp.City = reader.GetString(4);
                if (!reader.IsDBNull(5)) rp.Country = reader.GetString(5);
                if (!reader.IsDBNull(6)) rp.LastName = reader.GetString(6);
                if (!reader.IsDBNull(7)) rp.FirstName = reader.GetString(7);
                if (!reader.IsDBNull(8)) rp.Phone = reader.GetString(8);
                if (!reader.IsDBNull(9)) rp.Fax = reader.GetString(9);
                if (!reader.IsDBNull(10)) rp.EMail = reader.GetString(10);
                if (!reader.IsDBNull(11)) rp.Logon = reader.GetString(11);
                if (!reader.IsDBNull(12)) rp.PasswordHash = reader.GetString(12);
                if (!reader.IsDBNull(13)) rp.Salt = reader.GetGuid(13).ToString();
                if (!reader.IsDBNull(14)) rp.Created = reader.GetDateTime(14);
                if (!reader.IsDBNull(15)) rp.Changed = reader.GetDateTime(15);
                if (!reader.IsDBNull(16)) rp.Flags = reader.GetInt32(16);
                if (!reader.IsDBNull(17)) rp.Deleted = reader.GetInt32(17);
                if (!reader.IsDBNull(18)) rp.UserEMail = reader.GetString(18);
                result.Add(rp);
            }
            reader.Close();
            return result;
        }

        #endregion

        #region password related methods

        public void SetPassword(string password)
        {
            using (SHA512 shaM = new SHA512Managed())
            {
                // first-time logon sets the password
                if (this.Salt == null) this.Salt = Guid.NewGuid().ToString();
                byte[] hashData = shaM.ComputeHash(Encoding.UTF8.GetBytes(password + this.Salt));
                this.PasswordHash = BitConverter.ToString(hashData).Replace("-", "");
            }
        }

        public string GetHash(string password)
        {
            using (SHA512 shaM = new SHA512Managed())
            {
                byte[] hashData = shaM.ComputeHash(Encoding.UTF8.GetBytes(password + this.Salt));
                string calcPWHash = BitConverter.ToString(hashData).Replace("-", "");
                return calcPWHash;
            }
        }

        #endregion

        #region public static methods

        public static LogonResult Login(string name, string password, out ReportingParty reportingParty)
        {
            LogonResult result = LogonResult.USERUKN;
            reportingParty = null;

            // load all users
            Dictionary<Guid, ReportingParty> reportingPartyDict = DBManager.Instance.GetReportingPartyDict(); // passt nicht ganz aber egal
            foreach(Guid key in reportingPartyDict.Keys)
            {
                if (reportingPartyDict[key].Logon == null) continue;
                if (reportingPartyDict[key].Logon.Equals(name))
                {
                    // found user

                    // first-time logon sets the password                        
                    if (reportingPartyDict[key].PasswordHash == null)
                    {
                        reportingPartyDict[key].SetPassword(password);
                        result = LogonResult.OK;
                        DBManager.Instance.Save(reportingPartyDict[key]);
                        reportingParty = reportingPartyDict[key];
                    }
                    else // calculate hash from PW
                    {

                        string calcPWHash = reportingPartyDict[key].GetHash(password);
                        result = reportingPartyDict[key].PasswordHash.Equals(calcPWHash) ? LogonResult.OK : LogonResult.FAILED;
                        if (result == LogonResult.OK) reportingParty = reportingPartyDict[key];
                    }
                }
            }

            return result;
        }

        #endregion

        #region private methods

        private void SetUserFlag(bool value, UserFlags flag)
        {
            if (value) this.Flags |= (int)flag;
            else this.Flags &= (int)~flag;
        }

        #endregion

    }
}