// Copyright (c) 2022 - schick Informatik
// bsmd.AIS2Service [MonitorZone.cs]: %UserDisplayName%
// Description: Represents a geographical area that should be checked against
// ship positions

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace bsmd.AIS2Service
{

    #region DBEntity

    public class DBEntity
    {
        protected int _id; // PK from database

        public DBEntity(int id)
        {
            _id = id;
        }

        public int Id { get { return _id; } set { _id = value; } } 

    }

    #endregion

    #region class MonitorGroup

    public class MonitorGroup : DBEntity
    {
        #region fields
        
        private readonly string _name;
        private readonly List<MonitorZone> _zones = new List<MonitorZone>();

        #endregion

        #region Construction

        public MonitorGroup(int id, string name) : base( id )
        {
            _name = name;
        }

        #endregion

        #region Properties

        public List<MonitorZone> Zones { get { return _zones; } }        

        public string Name { get { return _name; } }

        #endregion
    }

    #endregion

    #region class MonitorZone

    public class MonitorZone : DBEntity
    {

        #region fields
        
        private readonly List<GeoPoint> _vertices = new List<GeoPoint>();
        private readonly List<MonitorAssignment> _assignments = new List<MonitorAssignment>();
        private readonly string _name;

        #endregion

        #region Construction

        public MonitorZone(int id, string name) : base (id)
        {
            _name = name;
        }

        #endregion

        #region Properties        

        public string Name { get { return _name; } }

        public List<GeoPoint> Vertices { get { return _vertices; } }

        public List<MonitorAssignment> Assignments { get { return _assignments; } }

        public bool Active { get; set; }

        public int Sequence { get; set; }

        public int MonitorGroupId { get; set; }

        #endregion

        #region public methods

        public bool IsPointInPolygon4(GeoPoint testPoint)
        {
            bool result = false;
            int j = _vertices.Count() - 1;
            for (int i = 0; i < _vertices.Count(); i++)
            {
                if (_vertices[i].Lat < testPoint.Lat && _vertices[j].Lat >= testPoint.Lat || _vertices[j].Lat < testPoint.Lat && _vertices[i].Lat >= testPoint.Lat)
                {
                    if (_vertices[i].Lon + (testPoint.Lat - _vertices[i].Lat) / (_vertices[j].Lat - _vertices[i].Lat) * (_vertices[j].Lon - _vertices[i].Lon) < testPoint.Lon)
                    {
                        result = !result;
                    }
                }
                j = i;
            }
            return result;
        }

        #endregion

    }

    #endregion

    #region class GeoPoint

    public class GeoPoint : DBEntity
    {        

        public GeoPoint(int id) : base (id)
        {}        

        public double Lat { get; set; }
        public double Lon { get; set; }

        public int MonitorZoneId { get; set; }
    }

    #endregion

    #region class MonitorAssignment

    public class MonitorAssignment : DBEntity
    {        

        public MonitorAssignment(int id) : base(id)
        {}

        [Flags]
        public enum ZoneMonitorType
        {
            INACTIVE = 0,
            ENTER = 1,
            EXIT = 2,
            PASSTHROUGH = 4, // outside - enter - inside - exit - outside
            LEAVE_AND_RETURN = 8 // inside - exit - outside - enter - inside
        }

        public int Id { get { return _id; } }

        public int MMSI { get; set; }

        public ZoneMonitorType MonitorType { get; set; } = ZoneMonitorType.INACTIVE;

    }

    #endregion

    #region class Alarm

    public class Alarm : DBEntity
    {        
        private readonly MonitorAssignment _assignment;

        public Alarm(int id, MonitorAssignment assignment) : base(id) { _assignment = assignment; }        

        public MonitorAssignment Assignment { get { return _assignment; } }

        public DateTime Timestamp { get; set; }

        public DateTime? Acknowledged { get; set; }

        public MonitorAssignment.ZoneMonitorType ZoneMonitorType { get; set; }

    }

    #endregion

}