using JetBrains.Annotations;
using UnityEngine;


namespace InGameUI {
	
	/// <summary>
	/// Writen by Windexglow 11-13-10.  Use it, edit it, steal it I don't care.
	/// Converted to C# 27-02-13 - no credit wanted.
	/// Simple flycam I made, since I couldn't find any others made public.
	/// Made simple to use (drag and drop, done) for regular keyboard layout
	/// wasd : basic movement
	/// shift : Makes camera accelerate
	/// space : Moves camera on X and Z axis only.  So camera doesn't gain any height*/
	///
	/// 
	/// Edited slightly By Adam Bebko
	/// </summary>
	public class FlyCamera : MonoBehaviour {
		
		public Vector3 startingPosition;
		public float   mainSpeed             = 100.0f; //regular speed
		public float   shiftAdd              = 250.0f; //multiplied by how long shift is held.  Basically running
		public float   maxShift              = 1000.0f; //Maximum speed when holdin gshift
		public float   camSens               = 0.25f; //How sensitive it with mouse
		public bool    rotateOnlyIfMousedown = true;
		public bool    movementStaysFlat     = true;

		private Vector3 lastMouse = new Vector3(255, 255, 255); //kind of in the middle of the screen, rather than at the top (play)
		private float   totalRun  = 1.0f;
		public  float   forwardSpeed;
		public  float   panSpeed;
		
		public bool Frozen;
		
		void Awake() {
			//Debug.Log ("FlyCamera Awake() - RESETTING CAMERA POSITION"); // nop?
			// nop:
			//transform.position.Set(0,8,-32);
			//transform.rotation.Set(15,0,0,1);
			Recenter();
		}

		public void Recenter() {
			transform.position = startingPosition;
			transform.LookAt(new Vector3(0, 0, 0));
		}

		[PublicAPI]
		public void ToggleFrozen() {
			Frozen = !Frozen;
		}

		void Update () {

			if (Frozen) return;
			
			if (Input.GetMouseButtonDown(1))
			{
				lastMouse = Input.mousePosition; // $CTK reset when we begin
			}

			if (!rotateOnlyIfMousedown || 
				(rotateOnlyIfMousedown && Input.GetMouseButton(1)))
			{
				lastMouse = Input.mousePosition - lastMouse ;
				lastMouse = new Vector3(-lastMouse.y * camSens, lastMouse.x * camSens, 0 );
				lastMouse = new Vector3(transform.eulerAngles.x + lastMouse.x , transform.eulerAngles.y + lastMouse.y, 0);
				transform.eulerAngles = lastMouse;
				lastMouse =  Input.mousePosition;
				//Mouse  camera angle done.  
			}

			transform.Translate(Vector3.forward * forwardSpeed * Input.mouseScrollDelta.y);

			if (Input.GetKey(KeyCode.Mouse2)) {
				transform.Translate(Input.GetAxis("Mouse X") * Vector3.left * panSpeed);
				transform.Translate(Input.GetAxis("Mouse Y") * Vector3.down * panSpeed);
			}
		
			//Keyboard commands
			Vector3 p = GetBaseInput();
			if (Input.GetKey (KeyCode.LeftShift)){
				totalRun += Time.deltaTime;
				p  = p * totalRun * shiftAdd;
				p.x = Mathf.Clamp(p.x, -maxShift, maxShift);
				p.y = Mathf.Clamp(p.y, -maxShift, maxShift);
				p.z = Mathf.Clamp(p.z, -maxShift, maxShift);
			}
			else{
				totalRun = Mathf.Clamp(totalRun * 0.5f, 1f, 1000f);
				p = p * mainSpeed;
			}
		
			p = p * Time.deltaTime;
			Vector3 newPosition = transform.position;
			if (Input.GetKey(KeyCode.Space) 
				|| (movementStaysFlat && !(rotateOnlyIfMousedown && Input.GetMouseButton(1)))){ //If player wants to move on X and Z axis only
				transform.Translate(p);
				newPosition.x = transform.position.x;
				newPosition.z = transform.position.z;
				transform.position = newPosition;
			}
			else{
				transform.Translate(p);
			}
		
		}
	
		private Vector3 GetBaseInput() { //returns the basic values, if it's 0 than it's not active.
			Vector3 p_Velocity = new Vector3();
			if (Input.GetKey (KeyCode.W)){
				p_Velocity += new Vector3(0, 0 , 1);
			}
			if (Input.GetKey (KeyCode.S)){
				p_Velocity += new Vector3(0, 0, -1);
			}
			if (Input.GetKey (KeyCode.A)){
				p_Velocity += new Vector3(-1, 0, 0);
			}
			if (Input.GetKey (KeyCode.D)){
				p_Velocity += new Vector3(1, 0, 0);
			}
			return p_Velocity;
		}
	}
}