using UnityEngine;
using System.Collections;

public class CameraControl : MonoBehaviour
{
	public Transform target;
	public Vector3 offset;

	public float sensitivity = 3; // чувствительность мышки
	public float limit = 80; // ограничение вращения по Y

	public float zoom = 0.25f; // чувствительность при увеличении, колесиком мышки
	public float zoomMax = 10; // макс. увеличение
	public float zoomMin = 3; // мин. увеличение

	private float X, Y;

	public bool may;

	void Start()
	{
		limit = Mathf.Abs(limit);
		if (limit > 90) limit = 90;

		offset = new Vector3(offset.x, offset.y, -Mathf.Abs(zoomMax) / 2);
		transform.position = target.position + offset;
	}

	void Update()
	{
		float length = 0;
		float tempLength;

		float x1 = 0;
		float x2;

		float y1 = 0;
		float y2;

		bool b = false;

		switch (Input.touchCount)
		{
			case 1:
				if (may)
				{
					if (!b)
					{
						x1 = Input.GetTouch(0).position.x;
						y1 = Input.GetTouch(0).position.y;
						b = true;
					}

					x2 = x1;
					x1 = Input.GetTouch(0).position.x;

					y2 = y1;
					y1 = Input.GetTouch(0).position.y;

					X = transform.localEulerAngles.y * sensitivity * (x2 - x1);
					Y += (y2 - y1) * sensitivity;

					print(y2-y1);

					Y = Mathf.Clamp(Y, -limit, limit);
				}
				break;
			case 2:
				if (may)
				{
					tempLength = length;
					length = (Input.GetTouch(0).position - Input.GetTouch(1).position).magnitude;

					offset.z -= length - tempLength;

					offset.z = Mathf.Clamp(offset.z, -Mathf.Abs(zoomMax), -Mathf.Abs(zoomMin));
				}
				break;
		}

		transform.localEulerAngles = new Vector3(-Y, X, 0);
		transform.position = transform.localRotation * offset + target.position;
	}

	public void May(bool b) => may = b;
}