using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using Comal.Classes;
using InABox.Core;
using InABox.Database;

namespace Comal.Stores
{
    public class GPSTrackerLocationStore : BaseStore<GPSTrackerLocation>
    {
        private static ConcurrentDictionary<string, Guid> _cache;

        private static ConcurrentBag<Tuple<double, double, string>> _addresses;

        public override void Init()
        {
            Logger.Send(LogType.Information, "", "Initializing GPS Tracker Caches");
            _addresses = new ConcurrentBag<Tuple<double, double, string>>(
                Provider.Query(
                    new Filter<GPSTrackerLocation>(x => x.Location.Address).IsNotEqualTo(""),
                    new Columns<GPSTrackerLocation>(
                        x => x.Location.Address,
                        x => x.Location.Longitude,
                        x => x.Location.Latitude
                    ),
                    null,
                    int.MaxValue,
                    true,
                    true
                ).Rows.Select(r => new Tuple<double, double, string>(
                        r.Get<GPSTrackerLocation, double>(c => c.Location.Latitude),
                        r.Get<GPSTrackerLocation, double>(c => c.Location.Longitude),
                        r.Get<GPSTrackerLocation, string>(c => c.Location.Address)
                    )
                ));

            _cache = new ConcurrentDictionary<string, Guid>(
                Provider.Query(
                    new Filter<GPSTracker>(x => x.DeviceID).IsNotEqualTo(Guid.Empty),
                    new Columns<GPSTracker>(x => x.DeviceID).Add(x => x.ID)
                ).Rows.Select(r => new KeyValuePair<String, Guid>(r.Get<GPSTracker, String>(c => c.DeviceID), r.Get<GPSTracker, Guid>(c => c.ID)))
            );

        }

        public string ReverseGeocode(double latitude, double longitude)
        {
            var tuple = _addresses.FirstOrDefault(x => Equals(x.Item1, latitude) && Equals(x.Item2, longitude));
            if (tuple == null)
            {
                var address = StoreUtils.ReverseGeocode(latitude, longitude);
                if (!string.IsNullOrWhiteSpace(address))
                {
                    tuple = new Tuple<double, double, string>(latitude, longitude, address);
                    _addresses.Add(tuple);
                }
            }

            return tuple != null ? tuple.Item3 : "";
        }

        protected override void BeforeSave(GPSTrackerLocation entity)
        {
            base.BeforeSave(entity);
            
            if (Equals(entity.Tracker.ID, Guid.Empty))
            {
                if (!_cache.ContainsKey(entity.DeviceID))
                {
                    Logger.Send(LogType.Information, "", string.Format("- Tracker Cache Update Required: {0}", entity.DeviceID));
                    var row = Provider.Query(
                        new Filter<GPSTracker>(x => x.DeviceID).IsEqualTo(entity.DeviceID),
                        new Columns<GPSTracker>(x => x.ID)
                    ).Rows.FirstOrDefault();
                    if (row != null)
                    {
                        entity.Tracker.ID = row.Get<GPSTracker, Guid>(x => x.ID);
                        _cache[entity.DeviceID] = entity.Tracker.ID;
                        Logger.Send(LogType.Information, "",
                            string.Format("- Adding Tracker to Cache: {0} => {1}", entity.DeviceID, entity.Tracker.ID));
                    }
                }
                else
                {
                    entity.Tracker.ID = _cache[entity.DeviceID];
                }
            }

            if (!Equals(entity.Tracker.ID, Guid.Empty)
                && string.IsNullOrWhiteSpace(entity.Location.Address)
                && !Equals(entity.Location.Latitude, 0.0D)
                && !Equals(entity.Location.Longitude, 0.0D)
               )
                entity.Location.Address = ReverseGeocode(entity.Location.Latitude, entity.Location.Longitude);
        }

        private void UpdateTrackers(IEnumerable<GPSTrackerLocation> entities, ref string auditnote)
        {
            var updates = new List<GPSTracker>();
            foreach (var entity in entities)
            {
                if (entity.Tracker.IsValid())
                {
                    var tracker = new GPSTracker();
                    tracker.ID = entity.Tracker.ID;
                    tracker.Location.Longitude = entity.Location.Longitude;
                    tracker.Location.Latitude = entity.Location.Latitude;
                    tracker.Location.Timestamp = entity.Location.Timestamp;
                    tracker.Location.Address = entity.Location.Address;
                    tracker.BatteryLevel = entity.BatteryLevel;
                    tracker.Hours = entity.Hours;
                    tracker.Distance = entity.Distance;
                    tracker.Counter1 = entity.Counter1;
                    tracker.Counter2 = entity.Counter2;
                    tracker.Counter3 = entity.Counter3;
                    tracker.Counter4 = entity.Counter4;
                    updates.Add(tracker);
                }
                else
                {
                    Logger.Send(LogType.Error, "", string.Format("Skipping GPS Tracker Update (Cache Size={0})", _cache.Count));
                }
            }
            if (updates.Any())
            {
                Provider.Save(updates);
                AuditTrail(updates, new[] { auditnote });
            }

            auditnote = null;
        }

        protected override void OnSave(IEnumerable<GPSTrackerLocation> entities, ref string auditnote)
        {
            var updates = entities.Where(x => !Equals(x.Tracker.ID, Guid.Empty)).ToArray();
            if (updates.Any())
            {
                UpdateTrackers(updates, ref auditnote);
                base.OnSave(updates, ref auditnote);
            }
        }

        protected override void OnSave(GPSTrackerLocation entity, ref string auditnote)
        {
            if (Equals(entity.Tracker.ID, Guid.Empty))
                return;
            UpdateTrackers(new[] { entity }, ref auditnote);
            base.OnSave(entity, ref auditnote);
        }
    }
}