using UnityEngine;

namespace Artngame.TEM
{
	public class BuildingShaker : MonoBehaviour
	{
		public Transform[] floorArray;

		private Transform groundObj;

		private Vector3[] posNew;

		private Vector3[] posOld;

		private Vector3[] velArray;

		public float m;

		private float k;

		private float c;

		private Vector3 startPos;

		private void Start()
		{
			groundObj = GameObject.FindGameObjectWithTag("Ground").transform;
			startPos = base.transform.position - groundObj.position;
			posNew = new Vector3[floorArray.Length];
			posOld = new Vector3[floorArray.Length];
			velArray = new Vector3[floorArray.Length];
			for (int i = 0; i < posNew.Length; i++)
			{
				posNew[i] = Vector3.zero;
				posOld[i] = floorArray[i].position;
				velArray[i] = Vector3.zero;
			}
			k = 2f * m;
			c = k / 10f;
		}

		private void FixedUpdate()
		{
			base.transform.position = groundObj.position + startPos;
			ShakeBuilding();
		}

		private void ShakeBuilding()
		{
			float num = 0.02f;
			for (int i = 0; i < floorArray.Length; i++)
			{
				Vector3 vector = posOld[i];
				Vector3 zero = Vector3.zero;
				zero = ((i != 0) ? ((i != floorArray.Length - 1) ? (((0f - k) * (vector - posOld[i - 1]) + k * (posOld[i + 1] - vector)) / m) : ((0f - k) * (vector - posOld[i - 1]) / m)) : (((0f - k) * (vector - base.transform.position) + k * (posOld[i + 1] - vector)) / m));
				zero -= c * velArray[i] / m;
				posNew[i] = vector + num * velArray[i];
				velArray[i] += num * zero;
			}
			for (int j = 0; j < floorArray.Length; j++)
			{
				Vector3 position = new Vector3(posNew[j].x, floorArray[j].position.y, posNew[j].z);
				floorArray[j].position = position;
				posOld[j] = posNew[j];
			}
		}
	}
}