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

namespace DunGen
{
	[Serializable]
	public class GameObjectChanceTable
	{
		public List<GameObjectChance> Weights = new List<GameObjectChance>();

		public GameObjectChanceTable Clone()
		{
			GameObjectChanceTable gameObjectChanceTable = new GameObjectChanceTable();
			foreach (GameObjectChance weight in Weights)
			{
				gameObjectChanceTable.Weights.Add(new GameObjectChance(weight.Value, weight.MainPathWeight, weight.BranchPathWeight, weight.TileSet)
				{
					DepthWeightScale = weight.DepthWeightScale
				});
			}
			return gameObjectChanceTable;
		}

		public bool ContainsGameObject(GameObject obj)
		{
			foreach (GameObjectChance weight in Weights)
			{
				if (weight.Value == obj)
				{
					return true;
				}
			}
			return false;
		}

		public GameObjectChance GetRandom(RandomStream random, bool isOnMainPath, float normalizedDepth, GameObject previouslyChosen, bool allowImmediateRepeats, bool removeFromTable = false)
		{
			float num = 0f;
			foreach (GameObjectChance weight2 in Weights)
			{
				if (weight2 != null && weight2.Value != null && (allowImmediateRepeats || previouslyChosen == null || weight2.Value != previouslyChosen))
				{
					num += weight2.GetWeight(isOnMainPath, normalizedDepth);
				}
			}
			float num2 = (float)(random.NextDouble() * (double)num);
			foreach (GameObjectChance weight3 in Weights)
			{
				if (weight3 == null || weight3.Value == null || (weight3.Value == previouslyChosen && Weights.Count > 1 && !allowImmediateRepeats))
				{
					continue;
				}
				float weight = weight3.GetWeight(isOnMainPath, normalizedDepth);
				if (num2 < weight)
				{
					if (removeFromTable)
					{
						Weights.Remove(weight3);
					}
					return weight3;
				}
				num2 -= weight;
			}
			return null;
		}

		public static GameObject GetCombinedRandom(RandomStream random, bool isOnMainPath, float normalizedDepth, params GameObjectChanceTable[] tables)
		{
			float num = tables.SelectMany((GameObjectChanceTable x) => x.Weights.Select((GameObjectChance y) => y.GetWeight(isOnMainPath, normalizedDepth))).Sum();
			float num2 = (float)(random.NextDouble() * (double)num);
			foreach (GameObjectChance item in tables.SelectMany((GameObjectChanceTable x) => x.Weights))
			{
				float weight = item.GetWeight(isOnMainPath, normalizedDepth);
				if (num2 < weight)
				{
					return item.Value;
				}
				num2 -= weight;
			}
			return null;
		}

		public static GameObjectChanceTable Combine(params GameObjectChanceTable[] tables)
		{
			GameObjectChanceTable gameObjectChanceTable = new GameObjectChanceTable();
			for (int i = 0; i < tables.Length; i++)
			{
				foreach (GameObjectChance weight in tables[i].Weights)
				{
					gameObjectChanceTable.Weights.Add(new GameObjectChance(weight.Value, weight.MainPathWeight, weight.BranchPathWeight, weight.TileSet)
					{
						DepthWeightScale = weight.DepthWeightScale
					});
				}
			}
			return gameObjectChanceTable;
		}
	}
}