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

public class FreeCamera : MonoBehaviour
{
	[SerializeField] float MoveSpeed;
	[SerializeField] float MoveAccelerationSpeed;

	[SerializeField] float RotateSpeed;

	Vector3 Velocity;
	Vector3 MousePos;

	void Update()
    {
		Velocity.z = Mathf.MoveTowards (Velocity.z, Input.GetAxis ("Vertical") * MoveSpeed, MoveAccelerationSpeed * Time.deltaTime);
		Velocity.x = Mathf.MoveTowards (Velocity.x, Input.GetAxis ("Horizontal") * MoveSpeed, MoveAccelerationSpeed * Time.deltaTime);
		Velocity.y = Mathf.MoveTowards (Velocity.y, (Input.GetKey(KeyCode.E)? 1: Input.GetKey (KeyCode.Q)? -1: 0) * MoveSpeed * 0.3f, MoveAccelerationSpeed * Time.deltaTime);

		transform.position += transform.TransformDirection (Velocity);

		var mousePosDelta = Input.mousePosition - MousePos;
		MousePos = Input.mousePosition;

		transform.rotation *= Quaternion.AngleAxis (Input.GetAxis ("Mouse Y") * RotateSpeed, Vector3.left);
		transform.rotation *= Quaternion.AngleAxis (Input.GetAxis ("Mouse X") * RotateSpeed, Vector3.up);

		var eulerAngles = transform.eulerAngles;
		eulerAngles.z = 0;
		transform.eulerAngles = eulerAngles;

		if (Input.GetKey (KeyCode.LeftAlt))
		{
			Cursor.visible = true;
			Cursor.lockState = CursorLockMode.None;
		}
		else
		{
			Cursor.visible = false;
			Cursor.lockState = CursorLockMode.Locked;
		}

		Camera.main.fieldOfView = Mathf.Clamp (Camera.main.fieldOfView + Input.mouseScrollDelta.y, 5, 150);
	}
}