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

public class ThirdPersonCamera : MonoBehaviour {
    //define some constants
    private const float LOW_LIMIT = 0.0f;
    private const float HIGH_LIMIT = 85.0f;

    //these will be available in the editor
    public GameObject theCamera;
    public float followDistance = 5.0f;
    public float mouseSensitivityX = 4.0f;
    public float mouseSensitivityY = 2.0f;
    public float heightOffset = 0.5f;

    //private variables are hidden in editor
    private bool isPaused = false;

    // Use this for initialization
    void Start () {
        //place the camera and set the forward vector to match player
        theCamera.transform.forward = gameObject.transform.forward;
        //hide the cursor and lock the cursor to center
        Cursor.visible = false;
        Cursor.lockState = CursorLockMode.Locked;
    }

    // Update is called once per frame
    void Update () {
        //if escape key (default) is pressed, pause the game (feel free to change this)
        if (Input.GetButton("Cancel"))
        {
            //flip the isPaused state, hide/unhide the cursor, flip the lock state
            isPaused = !isPaused;
            Cursor.visible = !Cursor.visible;
            Cursor.lockState = Cursor.lockState == CursorLockMode.Locked ?
            CursorLockMode.None : CursorLockMode.Locked;
            System.Threading.Thread.Sleep(200);
        }

        if(!isPaused)
        {
            //if we are not paused, get the mouse movement and adjust the camera
            //position and rotation to reflect this movement around player
            Vector2 cameraMovement = new Vector2(Input.GetAxis("Mouse X"),Input.GetAxis("Mouse Y"));

            //first we place the camera at the position of the player + height offset
            theCamera.transform.position = gameObject.transform.position + new Vector3(0,heightOffset,0);

            //next we adjust the rotation based on the captured mouse movement
            //we clamp the pitch (X angle) of the camera to avoid flipping
            //we also adjust the values to account for mouse sensitivity settings
            theCamera.transform.eulerAngles = new Vector3(
                Mathf.Clamp(theCamera.transform.eulerAngles.x + cameraMovement.y * mouseSensitivityY, LOW_LIMIT, HIGH_LIMIT),
                theCamera.transform.eulerAngles.y + cameraMovement.x * mouseSensitivityX, 0);

            //then we move out to the desired follow distance
            theCamera.transform.position -= theCamera.transform.forward * followDistance;
        }
    }
}