using System;
using System.Collections.Generic;
using UnityEngine;

namespace SUISSEngine
{
	public class VehicleManager : MonoBehaviour
	{
		protected virtual void Awake()
		{
		}

		protected virtual void Start()
		{
		}

		protected virtual void LateUpdate()
		{
			this.RefreshVehiclesIfNeeded();
		}

		public virtual void WillBeginBuildingRoads(int type)
		{
		}

		public virtual void DidBuildRoadAt(GridIndex index, Road road)
		{
			VehicleManager.RoadStats statsForRoadType = this.GetStatsForRoadType(road.type);
			statsForRoadType.Area++;
		}

		public virtual void WillDestroyRoadAt(GridIndex index, Road road)
		{
			VehicleManager.RoadStats statsForRoadType = this.GetStatsForRoadType(road.type);
			statsForRoadType.Area--;
		}

		public virtual void DidFinishBuildingRoads(int type)
		{
			this.SetNeedsRefresh();
		}

		public virtual void DidBuildTileAt(GridIndex index, GridTile tile)
		{
		}

		public virtual void WillDestroyTileAt(GridIndex index, GridTile tile)
		{
		}

		public virtual void VehicleStuck(Vehicle vehicle)
		{
			if (vehicle == null || !vehicle.IsStuck)
			{
				return;
			}
			VehicleManager.RoadStats statsForRoadType = this.GetStatsForRoadType(vehicle.RoadType);
			foreach (VehicleManager.VehicleRegistration vehicleRegistration in statsForRoadType.Registrations)
			{
				int num = vehicleRegistration.Instances.IndexOf(vehicle);
				if (num >= 0)
				{
					vehicleRegistration.Instances.RemoveAt(num);
					break;
				}
			}
			UnityEngine.Object.Destroy(vehicle.gameObject);
			this.SetNeedsRefresh();
		}

		public VehicleManager.RoadStats GetStatsForRoadType(int type)
		{
			VehicleManager.RoadStats roadStats;
			if (!this.statsDictionary.TryGetValue(type, out roadStats))
			{
				roadStats = this.CreateStatsForRoadType(type);
				this.statsDictionary.Add(type, roadStats);
			}
			return roadStats;
		}

		protected virtual VehicleManager.RoadStats CreateStatsForRoadType(int type)
		{
			return new VehicleManager.RoadStats(this, type);
		}

		protected void SetNeedsRefresh()
		{
			this.needsRefresh = true;
		}

		protected void RefreshVehiclesIfNeeded()
		{
			if (this.needsRefresh)
			{
				this.needsRefresh = false;
				this.RefreshVehicles();
			}
		}

		protected void RefreshVehicles()
		{
			if (this.grid == null)
			{
				return;
			}
			foreach (VehicleManager.RoadStats roadStats in this.statsDictionary.Values)
			{
				foreach (VehicleManager.VehicleRegistration vehicleRegistration in roadStats.Registrations)
				{
					while (vehicleRegistration.Instances.Count > vehicleRegistration.PreferredCount)
					{
						int index = vehicleRegistration.Instances.Count - 1;
						Vehicle vehicle = vehicleRegistration.Instances[index];
						vehicleRegistration.Instances.RemoveAt(index);
						UnityEngine.Object.Destroy(vehicle.gameObject);
					}
				}
			}
			foreach (VehicleManager.RoadStats roadStats2 in this.statsDictionary.Values)
			{
				List<Road> list = null;
				bool flag = true;
				foreach (VehicleManager.VehicleRegistration vehicleRegistration2 in roadStats2.Registrations)
				{
					while (vehicleRegistration2.Instances.Count < vehicleRegistration2.PreferredCount)
					{
						if (list == null)
						{
							list = this.FindRoadsOfType(roadStats2.Type);
						}
						Road road = this.FindRandomAvailableRoad(list);
						if (road == null)
						{
							flag = false;
							break;
						}
						GridTile component = road.GetComponent<GridTile>();
						if (vehicleRegistration2.Prefabs == null || vehicleRegistration2.Prefabs.Length == 0)
						{
							UnityEngine.Debug.LogError("Failed to instantiate a vehicle for " + vehicleRegistration2 + " because it has no prefabs.");
							break;
						}
						GameObject gameObject = vehicleRegistration2.Prefabs[UnityEngine.Random.Range(0, vehicleRegistration2.Prefabs.Length)];
						GameObject gameObject2 = UnityEngine.Object.Instantiate<GameObject>(gameObject);
						Vehicle component2 = gameObject2.GetComponent<Vehicle>();
						if (component2 == null)
						{
							UnityEngine.Debug.LogError(string.Concat(new object[]
							{
								"Failed to instantiate a vehicle for ",
								vehicleRegistration2,
								" because prefab ",
								gameObject,
								" is not a Vehicle."
							}));
							UnityEngine.Object.Destroy(gameObject2);
						}
						else
						{
							component2.transform.parent = this.grid.transform;
							GridIndex index2 = component.element.Index;
							index2.u -= UnityEngine.Random.Range(0, component.size.u);
							index2.v -= UnityEngine.Random.Range(0, component.size.v);
							vehicleRegistration2.Instances.Add(component2);
							component2.SpawnAt(index2, roadStats2.Type);
						}
					}
					if (!flag)
					{
						break;
					}
				}
			}
		}

		protected List<Road> FindRoadsOfType(int type)
		{
			List<Road> list = new List<Road>();
			if (this.grid == null)
			{
				return list;
			}
			GridSize size = this.grid.Size;
			for (int i = 0; i < size.v; i++)
			{
				for (int j = 0; j < size.u; j++)
				{
					GridTile tile = this.grid[j, i].Tile;
					if (tile != null)
					{
						Road component = tile.GetComponent<Road>();
						if (component != null && component.type == type)
						{
							list.Add(component);
						}
					}
				}
			}
			return list;
		}

		protected Road FindRandomAvailableRoad(List<Road> roads)
		{
			Road road = null;
			while (roads.Count > 0 && road == null)
			{
				int index = UnityEngine.Random.Range(0, roads.Count);
				road = roads[index];
				GridIndex index2 = road.GetComponent<GridTile>().index;
				int num = 0;
				index2.v--;
				if (Road.RoadExists(this.grid, index2, road.type))
				{
					num++;
				}
				index2.v++;
				index2.u++;
				if (Road.RoadExists(this.grid, index2, road.type))
				{
					num++;
				}
				index2.u--;
				index2.v++;
				if (Road.RoadExists(this.grid, index2, road.type))
				{
					num++;
				}
				index2.v--;
				index2.u--;
				if (Road.RoadExists(this.grid, index2, road.type))
				{
					num++;
				}
				index2.u++;
				if (num < 2)
				{
					roads.RemoveAt(index);
					road = null;
				}
			}
			return road;
		}

		[ChildReference]
		public IsometricGrid grid;

		protected Dictionary<int, VehicleManager.RoadStats> statsDictionary = new Dictionary<int, VehicleManager.RoadStats>();

		protected bool needsRefresh;

		public class RoadStats
		{
			public RoadStats(VehicleManager owner, int type)
			{
				this._owner = owner;
				this._type = type;
				this._area = 0;
				this._registrations = new List<VehicleManager.VehicleRegistration>();
				this._readOnlyRegistrations = this._registrations.AsReadOnly();
			}

			public VehicleManager Owner
			{
				get
				{
					return this._owner;
				}
			}

			public int Type
			{
				get
				{
					return this._type;
				}
			}

			public int Area
			{
				get
				{
					return this._area;
				}
				set
				{
					this._area = value;
				}
			}

			public IList<VehicleManager.VehicleRegistration> Registrations
			{
				get
				{
					return this._readOnlyRegistrations;
				}
			}

			public VehicleManager.VehicleRegistration RegisterVehicle(Vehicle.VehicleType vehicleType, params GameObject[] prefabs)
			{
				VehicleManager.VehicleRegistration vehicleRegistration = this.CreateRegistrationForPrefabs(vehicleType, prefabs);
				this._registrations.Add(vehicleRegistration);
				return vehicleRegistration;
			}

			public void UnregisterVehicle(VehicleManager.VehicleRegistration registration)
			{
				this._registrations.Remove(registration);
			}

			protected virtual VehicleManager.VehicleRegistration CreateRegistrationForPrefabs(Vehicle.VehicleType vehicleType, params GameObject[] prefabs)
			{
				return new VehicleManager.VehicleRegistration(this, vehicleType, prefabs);
			}

			protected VehicleManager _owner;

			protected int _type;

			protected int _area;

			protected List<VehicleManager.VehicleRegistration> _registrations;

			protected IList<VehicleManager.VehicleRegistration> _readOnlyRegistrations;
		}

		public class VehicleRegistration
		{
			public VehicleRegistration(VehicleManager.RoadStats stats, Vehicle.VehicleType vehicleType, GameObject[] prefabs)
			{
				this._stats = stats;
				this._prefabs = new List<GameObject>(prefabs);
				this._instances = new List<Vehicle>();
				this._preferredCount = 0;
				this._vehicleType = vehicleType;
			}

			public int RoadType
			{
				get
				{
					return this._stats.Type;
				}
			}

			public VehicleManager.RoadStats Stats
			{
				get
				{
					return this._stats;
				}
			}

			public GameObject[] Prefabs
			{
				get
				{
					return this._prefabs.ToArray();
				}
			}

			public List<Vehicle> Instances
			{
				get
				{
					return this._instances;
				}
			}

			public int PreferredCount
			{
				get
				{
					return this._preferredCount;
				}
				set
				{
					if (value != this._preferredCount)
					{
						this._preferredCount = Math.Max(0, value);
						this._stats.Owner.SetNeedsRefresh();
					}
				}
			}

			public Vehicle.VehicleType VehicleType
			{
				get
				{
					return this._vehicleType;
				}
			}

			public void AddPrefab(GameObject prefab)
			{
				this._prefabs.Add(prefab);
			}

			protected VehicleManager.RoadStats _stats;

			protected List<GameObject> _prefabs;

			protected List<Vehicle> _instances;

			protected int _preferredCount;

			protected Vehicle.VehicleType _vehicleType;
		}
	}
}