using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Drawing;
using System.Linq;
using System.Linq.Expressions;
using System.Windows;
using System.Windows.Threading;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using Inflector;
using Syncfusion.UI.Xaml.Maps;
using Point = System.Windows.Point;

namespace PRSDesktop;

public enum LiveMapView
{
    All,
    Selected
}

public class MapViewModel : DependencyObject
{
    
    static readonly DependencyProperty ViewProperty =
        DependencyProperty.Register(
            nameof(View),
            typeof(LiveMapView),
            typeof(MapViewModel),
            new PropertyMetadata(LiveMapView.All)
        );

    public LiveMapView View
    {
        get => (LiveMapView)GetValue(ViewProperty);
        set
        {
            SetValue(ViewProperty, value);
            Refresh();
        }
    }
    
    static readonly DependencyProperty StyleProperty =
        DependencyProperty.Register(
            nameof(Style),
            typeof(LiveMapStyle),
            typeof(MapViewModel),
            new PropertyMetadata(LiveMapStyle.OSM)
        );

    public LiveMapStyle Style
    {
        get => (LiveMapStyle)GetValue(StyleProperty);
        set => SetValue(StyleProperty, value);
    }
    
    static readonly DependencyProperty ApiKeyProperty =
        DependencyProperty.Register(
            nameof(ApiKey),
            typeof(string),
            typeof(MapViewModel),
            new PropertyMetadata("")
        );

    public string ApiKey
    {
        get => (string)GetValue(ApiKeyProperty);
        set => SetValue(ApiKeyProperty, value);
    }
    
    static readonly DependencyProperty LayersProperty =
        DependencyProperty.Register(
            nameof(Layers),
            typeof(ObservableCollection<ImageryLayer>),
            typeof(MapViewModel),
            new PropertyMetadata(new ObservableCollection<ImageryLayer>())
        );

    public ObservableCollection<ImageryLayer> Layers => (ObservableCollection<ImageryLayer>)GetValue(LayersProperty);
    
    static readonly DependencyProperty EntityTypesProperty =
        DependencyProperty.Register(
            nameof(EntityTypes),
            typeof(Dictionary<Type, String>),
            typeof(MapViewModel),
            new PropertyMetadata(new Dictionary<Type, String>())
        );
    
    public Dictionary<Type, String> EntityTypes => (Dictionary<Type, String>)GetValue(EntityTypesProperty);

    static readonly DependencyProperty EntityTypeProperty =
        DependencyProperty.Register(
            nameof(EntityType),
            typeof(Type),
            typeof(MapViewModel)
        );
    
    public Type? EntityType
    {
        get => (Type) GetValue(EntityTypeProperty);
        set
        {
            SetValue(EntityTypesProperty, value);
            ResetGroups();
        }
    }
    
    static readonly DependencyProperty EntityGroupsProperty =
        DependencyProperty.Register(
            nameof(EntityGroups),
            typeof(Dictionary<Guid, String>),
            typeof(MapViewModel),
            new PropertyMetadata(new Dictionary<Guid, String>())
        );
    
    public Dictionary<Guid, String> EntityGroups => (Dictionary<Guid, String>)GetValue(EntityGroupsProperty);

    static readonly DependencyProperty EntityGroupProperty =
        DependencyProperty.Register(
            nameof(EntityGroup),
            typeof(Guid),
            typeof(MapViewModel),
            new PropertyMetadata(Guid.Empty)
        );
    
    public Guid EntityGroup
    {
        get => (Guid)GetValue(EntityGroupProperty);
        set
        {
            SetValue(EntityGroupProperty,value);
            Refresh();
        }
    }
    
    //private readonly List<MapMarker> _markers = new();
    //private readonly List<MapMarker> _waypoints = new();
    //private MapMarker? _selected;
    
    
    static readonly DependencyProperty MarkersProperty =
        DependencyProperty.Register(
            nameof(Markers),
            typeof(ObservableCollection<MapMarker>),
            typeof(MapViewModel),
            new PropertyMetadata(new ObservableCollection<MapMarker>())
        );
    
    public ObservableCollection<MapMarker> Markers => (ObservableCollection<MapMarker>)GetValue(MarkersProperty);
    
    
    static readonly DependencyProperty SelectedMarkerProperty =
        DependencyProperty.Register(
            nameof(SelectedMarker),
            typeof(MapMarker),
            typeof(MapViewModel)
        );
    
    public MapMarker? SelectedMarker
    {
        get => GetValue(SelectedMarkerProperty) as MapMarker;
        set => SetValue(SelectedMarkerProperty, value);
    }

    static readonly DependencyProperty WayPointsProperty =
        DependencyProperty.Register(
            nameof(WayPoints),
            typeof(ObservableCollection<PointF>),
            typeof(MapViewModel),
            new PropertyMetadata(new ObservableCollection<PointF>())
        );
    
    public ObservableCollection<PointF> WayPoints => (ObservableCollection<PointF>)GetValue(WayPointsProperty);

    private LiveMapsSettings? _settings;
    
    public void Setup(LiveMapsSettings settings)
    {
        _settings = settings;
        
        LoadEntityTypes();
        
        EntityType = !String.IsNullOrWhiteSpace(_settings.EntityType)
            ? EntityTypes.Any(x => String.Equals(x.Key.EntityName(), _settings.EntityType))
                ? Type.GetType(_settings.EntityType)
                : null
            : null;
        
        EntityGroup = EntityGroups.Any(x => String.Equals(x.Key, _settings.EntityGroup))
            ? _settings.EntityGroup
            : Guid.Empty;

        Style = _settings.MapStyle;
        
        ApiKey = _settings.ApiKey;

    }
    
    private void LoadEntityTypes()
    {
                
        if (ClientFactory.IsSupported<Equipment>())
            EntityTypes[typeof(Equipment)] = typeof(Equipment).GetCaption().Pluralize();

        if (ClientFactory.IsSupported<Job>())
            EntityTypes[typeof(Job)] = typeof(Job).GetCaption().Pluralize();

        if (ClientFactory.IsSupported<TimeSheet>())
            EntityTypes[typeof(TimeSheet)] = typeof(TimeSheet).GetCaption().Pluralize();

        if (ClientFactory.IsSupported<GPSTracker>())
            EntityTypes[typeof(GPSTracker)] = typeof(GPSTracker).GetCaption().Pluralize();
    }

    private void ResetGroups()
    {
        EntityGroups.Clear();
        
        if (Type.Equals(EntityType,typeof(Equipment)))
            LoadGroups<EquipmentGroup>("All Equipment", x => x.Description);
        
        else if (Type.Equals(EntityType,typeof(Job)))
            LoadGroups<JobStatus>("All Jobs", x => x.Description);
        
        else if (Type.Equals(EntityType,typeof(GPSTracker)))
            LoadGroups<GPSTrackerType>("All Trackers", x => x.Description);
        
        else if (Type.Equals(EntityType,typeof(TimeSheet)))
        {
            EntityGroups[Guid.Empty] = "Open TimeSheets";
            EntityGroups[Guid.NewGuid()] = "TimeSheet Starts";
            EntityGroups[CoreUtils.FullGuid] = "TimeSheet Finishes";
        }
    }
    
    private void LoadGroups<TGroup>(string all, Expression<Func<TGroup, string>> description)
        where TGroup : Entity, IRemotable, IPersistent, new()
    {
        EntityGroups.Add(Guid.Empty, all);
        var _groups = new Client<TGroup>().Query(
            LookupFactory.DefineFilter<TGroup>(),
            LookupFactory.DefineColumns<TGroup>(),
            LookupFactory.DefineSort<TGroup>()
        );
        foreach (var _row in _groups.Rows)
            EntityGroups[_row.Get<TGroup, Guid>(x => x.ID)] = _row.Get(description);
    }
    
    public void Refresh()
    {
        Markers.Clear();
        WayPoints.Clear();
        if (View == LiveMapView.All)
            LoadMarkers();
        else if (SelectedMarker != null)
        {
            LoadWayPoints();
            foreach (var waypoint in _waypoints)
            {
                Markers.Add(waypoint);
                WayPoints.Add(new Point(double.Parse(waypoint.Longitude), double.Parse(waypoint.Latitude)));
            }
        }
    }

    public void LoadMarkers()
    {
            if (EntityType != null)
            {
                if (EntityType.Equals("Equipment"))
                {
                    var filter = new Filter<Equipment>(x => x.TrackerLink.Location.Timestamp).IsNotEqualTo(DateTime.MinValue);
                    if (!Security.IsAllowed<CanViewPrivateEquipment>())
                        filter = filter.And(x => x.Private).IsEqualTo(false);
                    if (EntityGroup != Guid.Empty)
                        filter = filter.And(x => x.GroupLink.ID).IsEqualTo(EntityGroup);

                    LoadMarkers(
                        filter,
                        x => x.ID,
                        x => x.Code,
                        x => x.Description,
                        x => x.TrackerLink.DeviceID,
                        x => x.TrackerLink.Location.Latitude,
                        x => x.TrackerLink.Location.Longitude,
                        x => x.TrackerLink.Description,
                        x => x.TrackerLink.Location.Timestamp
                    );
                }

                else if (EntityType.Equals("Jobs"))
                {
                    var filter = new Filter<Job>(x => x.SiteAddress.Location.Timestamp).IsNotEqualTo(DateTime.MinValue);
                    if (EntityGroup != Guid.Empty)
                        filter = filter.And(x => x.JobStatus.ID).IsEqualTo(EntityGroup);

                    LoadMarkers(
                        filter,
                        x => x.ID,
                        x => x.JobNumber,
                        x => x.Name,
                        null,
                        x => x.SiteAddress.Location.Latitude,
                        x => x.SiteAddress.Location.Longitude,
                        x => x.LastUpdateBy,
                        x => x.SiteAddress.Location.Timestamp
                    );
                }

                else if (EntityType.Equals("TimeSheets"))
                {
                    if (EntityGroup == Guid.Empty) // Starts
                        LoadMarkers(
                            new Filter<TimeSheet>(x => x.Date).IsEqualTo(DateTime.Today).And(x => x.StartLocation.Timestamp)
                                .IsNotEqualTo(new TimeSpan(0)),
                            x => x.EmployeeLink.ID,
                            x => x.EmployeeLink.Code,
                            x => x.EmployeeLink.Name,
                            null,
                            x => x.StartLocation.Latitude,
                            x => x.StartLocation.Longitude,
                            x => x.SoftwareVersion,
                            x => x.StartLocation.Timestamp
                        );
                    else if (EntityGroup == CoreUtils.FullGuid) // Finishes
                        LoadMarkers(
                            new Filter<TimeSheet>(x => x.Date).IsEqualTo(DateTime.Today).And(x => x.Finish).IsNotEqualTo(new TimeSpan(0))
                                .And(x => x.FinishLocation.Timestamp).IsNotEqualTo(new TimeSpan(0)),
                            x => x.EmployeeLink.ID,
                            x => x.EmployeeLink.Code,
                            x => x.EmployeeLink.Name,
                            null,
                            x => x.FinishLocation.Latitude,
                            x => x.FinishLocation.Longitude,
                            x => x.SoftwareVersion,
                            x => x.FinishLocation.Timestamp
                        );
                    else // Open
                        LoadMarkers(
                            new Filter<TimeSheet>(x => x.Date).IsEqualTo(DateTime.Today).And(x => x.Finish).IsEqualTo(new TimeSpan(0))
                                .And(x => x.StartLocation.Timestamp).IsNotEqualTo(new TimeSpan(0)),
                            x => x.EmployeeLink.ID,
                            x => x.EmployeeLink.Code,
                            x => x.EmployeeLink.Name,
                            null,
                            x => x.StartLocation.Latitude,
                            x => x.StartLocation.Longitude,
                            x => x.SoftwareVersion,
                            x => x.StartLocation.Timestamp
                        );
                }

                else if (EntityType.Equals("Trackers"))
                {
                    var filter = new Filter<GPSTracker>(x => x.Location.Timestamp).IsNotEqualTo(DateTime.MinValue);
                    if (EntityGroup != Guid.Empty)
                        filter = filter.And(x => x.Type.ID).IsEqualTo(EntityGroup);

                    LoadMarkers(
                        filter,
                        x => x.ID,
                        x => x.DeviceID,
                        x => x.Description,
                        x => x.DeviceID,
                        x => x.Location.Latitude,
                        x => x.Location.Longitude,
                        x => x.LastUpdateBy,
                        x => x.Location.Timestamp
                    );
                }
            }
    }

    private class DbMarker
    {
        public DbMarker(string code, string description, DateTime timestamp, double latitude, double longitude, string updatedby, string deviceid)
        {
            Code = code;
            Description = description;
            TimeStamp = timestamp;
            Latitude = latitude;
            Longitude = longitude;
            UpdatedBy = updatedby;
            DeviceID = deviceid;
        }

        public string Code { get; }
        public string Description { get; }
        public DateTime TimeStamp { get; }
        public double Latitude { get; }
        public double Longitude { get; }
        public string UpdatedBy { get; }
        public string DeviceID { get; }
    }
    
        private void LoadMarkers<T>(Filter<T> filter, Expression<Func<T, Guid>> guid, Expression<Func<T, string>>? code,
            Expression<Func<T, string>> description, Expression<Func<T, string>>? deviceid, Expression<Func<T, double>> latitude,
            Expression<Func<T, double>> longitude, Expression<Func<T, string>> updatedby, Expression<Func<T, DateTime>> timestamp, bool first = true)
            where T : Entity, IRemotable, IPersistent, new()
        {
            var _columns = new Columns<T>(x=>x.ID)
                .Add(guid)
                .Add(description)
                .Add(latitude)
                .Add(longitude)
                .Add(timestamp)
                .Add(updatedby);

            if (code != null)
                _columns.Add(code);
            
            if (deviceid != null && !_columns.ColumnNames().Contains(CoreUtils.GetFullPropertyName(deviceid, ".")))
                _columns.Add(deviceid);
            
            
            new Client<T>().Query(
                filter,
                _columns,
                null,
                (table, error) =>
                {
                    Dispatcher.Invoke(() =>
                    {
                        if (error != null)
                        {
                            MessageBox.Show(error.Message);
                        }
                        else if (table != null)
                        {
                            var _values = new Dictionary<Guid, DbMarker>(); 
                            
                            var _groups = table.Rows
                                .OrderBy(x=>x.Get(code ?? description))
                                .ThenBy(x=>x.Get(timestamp))
                                .Select(x => x.ToObject<T>())
                                .GroupBy(x => x.ID);
                            
                            foreach (var _group in _groups)
                            {
                                var last = _group.OrderBy(timefunc).LastOrDefault();
                                if (last != null)
                                    Markers.Add(
                                        new MapMarker
                                        {
                                            ID = last.ID,
                                            Label = last.,
                                            Latitude = string.Format("{0:F6}", _values[key].Latitude),
                                            Longitude = string.Format("{0:F6}", _values[key].Longitude),
                                            Description = _values[key].Description,
                                            Updated = _values[key].TimeStamp,
                                            UpdatedBy = _values[key].UpdatedBy,
                                            DeviceID = _values[key].DeviceID
                                        }
                                    );

                            }

                            foreach (var _row in table.Rows)
                            {
                                var _id = _row.Get(guid);
                                var _time = _row.Get(timestamp);
                                if (!_values.ContainsKey(_id) || (first ? _values[_id].TimeStamp < _time : _values[_id].TimeStamp > _time))
                                    _values[_id] = new DbMarker(
                                        code != null ? _row.Get(code) : "",
                                        _row.Get(description),
                                        _time,
                                        _row.Get(latitude),
                                        _row.Get(longitude),
                                        _row.Get(updatedby),
                                        deviceid != null ? _row.Get(deviceid) : ""
                                    );
                            }

                            foreach (var key in _values.Keys)
                                Markers.Add(
                                    new MapMarker
                                    {
                                        ID = key,
                                        Label = _values[key].Code,
                                        Latitude = string.Format("{0:F6}", _values[key].Latitude),
                                        Longitude = string.Format("{0:F6}", _values[key].Longitude),
                                        Description = _values[key].Description,
                                        Updated = _values[key].TimeStamp,
                                        UpdatedBy = _values[key].UpdatedBy,
                                        DeviceID = _values[key].DeviceID
                                    }
                                );
                        }

                        ResetZoom();

                        LoadMarkerList();
                    });
                }
            );
        }

        private void ResetZoom()
        {
            var nwLon = double.MaxValue;
            var nwLat = double.MinValue;
            var seLon = double.MinValue;
            var seLat = double.MaxValue;

            foreach (var marker in _markers)
            {
                var lat = double.Parse(marker.Latitude);
                var lon = double.Parse(marker.Longitude);
                if (lat != 0.0F && lon != 0.00)
                {
                    nwLat = lat > nwLat ? lat : nwLat;
                    seLat = lat < seLat ? lat : seLat;
                    nwLon = lon < nwLon ? lon : nwLon;
                    seLon = lon > seLon ? lon : seLon;
                }
            }

            
            var cLat = (nwLat + seLat) / 2.0F;
            var cLon = (nwLon + seLon) / 2.0F;
            Center = new Point(cLat, cLon);
            var nw = new Location { Latitude = nwLat, Longitude = nwLon };
            var c = new Location { Latitude = cLat, Longitude = cLon };
            Radius = c.DistanceTo(nw, UnitOfLength.Kilometers) / 2.0F;
        }
        
        public double Radius { get; set; }
        public Point Center { get; set; }
        
}