using System.Collections.Generic;
using UnityEngine;

namespace TerrainStitch
{
	public class TerrainNeighbours : MonoBehaviour
	{
		private Terrain[] _terrains;

		private Dictionary<int[], Terrain> _terrainDict;

		public Vector2 firstPosition;

		private void Start()
		{
			CreateNeighbours();
		}

		public void CreateNeighbours()
		{
			if (_terrainDict == null)
			{
				_terrainDict = new Dictionary<int[], Terrain>(new IntArrayComparer());
			}
			else
			{
				_terrainDict.Clear();
			}
			_terrains = Terrain.activeTerrains;
			if (_terrains.Length <= 0)
			{
				return;
			}
			firstPosition = new Vector2(_terrains[0].transform.position.x, _terrains[0].transform.position.z);
			int num = (int)_terrains[0].terrainData.size.x;
			int num2 = (int)_terrains[0].terrainData.size.z;
			Terrain[] terrains = _terrains;
			foreach (Terrain terrain in terrains)
			{
				int[] key = new int[2]
				{
					Mathf.RoundToInt((terrain.transform.position.x - firstPosition.x) / (float)num),
					Mathf.RoundToInt((terrain.transform.position.z - firstPosition.y) / (float)num2)
				};
				_terrainDict.Add(key, terrain);
			}
			foreach (KeyValuePair<int[], Terrain> item in _terrainDict)
			{
				int[] key2 = item.Key;
				Terrain value = null;
				Terrain value2 = null;
				Terrain value3 = null;
				Terrain value4 = null;
				_terrainDict.TryGetValue(new int[2]
				{
					key2[0],
					key2[1] + 1
				}, out value);
				_terrainDict.TryGetValue(new int[2]
				{
					key2[0] - 1,
					key2[1]
				}, out value2);
				_terrainDict.TryGetValue(new int[2]
				{
					key2[0] + 1,
					key2[1]
				}, out value3);
				_terrainDict.TryGetValue(new int[2]
				{
					key2[0],
					key2[1] - 1
				}, out value4);
				item.Value.SetNeighbors(value2, value, value3, value4);
				item.Value.Flush();
			}
		}
	}
}