using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Runtime.InteropServices;

public class CameraController : MonoBehaviour
{
    [DllImport("__Internal")]
    public static extern void Hello();


    public float mainSpeed = 1.0f; //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 invertY = true;

    public float scrollWheelSens = 1f;

    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;

    void Start()
    {
        Hello();
    }

    void Update()
    {
        if (Input.GetMouseButton(1))
        {
            var mouseMoveY = invertY ? -1 * Input.GetAxis("Mouse Y") : Input.GetAxis("Mouse Y");
            var mouseMoveX = Input.GetAxis("Mouse X");

            var mouseMove = new Vector3(mouseMoveY, mouseMoveX, 0) * camSens;
            transform.eulerAngles = transform.eulerAngles + mouseMove;
        }

        if (Input.GetMouseButtonDown(1))
        {
            Cursor.visible = false;
            Cursor.lockState = CursorLockMode.Locked;
        }

        if (Input.GetMouseButtonUp(1))
        {
            Cursor.visible = true;
            Cursor.lockState = CursorLockMode.None;
        }

        //Mouse  camera angle done.  

        //Keyboard commands
        Vector3 p = GetBaseInput();
        if (p.sqrMagnitude > 0)
        { // only move while a direction key is pressed
            if (Input.GetKey(KeyCode.LeftShift))
            {
                totalRun += Time.deltaTime;
                p = shiftAdd * totalRun * p;
                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 *= mainSpeed;
            }

            p *= Time.deltaTime;
            Vector3 newPosition = transform.position;
            if (Input.GetKey(KeyCode.Space))
            { //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);
            }
        }

        var scroll = Input.GetAxis("Mouse ScrollWheel");
        mainSpeed += scroll * scrollWheelSens;
    }

    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;
    }
}