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

[RequireComponent(typeof(CharacterController))]
public class FPSController : MonoBehaviour
{
    public Camera playerCamera;
    public float walkSpeed = 6f;
    public float runSpeed = 12f;
    public float jumpPower = 7f;
    public float gravity = 20f;
    public float lookSpeed = 2f;
    public float lookXLimit = 45f;
    public float bhopMultiplierIncrement = 0.05f;
    public float maxBhopSpeed = 20f;

    Vector3 moveDirection = Vector3.zero;
    float rotationX = 0;
    float bhopMultiplier = 1f;
    bool isJumping = false;
    bool wasRunning = false;

    public bool canMove = true;

    CharacterController characterController;

    void Start()
    {
        characterController = GetComponent<CharacterController>();
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
    }

    void Update()
    {
        Vector3 forward = transform.TransformDirection(Vector3.forward);
        Vector3 right = transform.TransformDirection(Vector3.right);
        bool isRunning = characterController.isGrounded ? Input.GetKey(KeyCode.LeftShift) : wasRunning;
        wasRunning = isRunning;
        float curSpeedX = canMove ? ((isRunning ? runSpeed : walkSpeed) * Input.GetAxis("Vertical")) * bhopMultiplier : 0;
        float curSpeedY = canMove ? ((isRunning ? runSpeed : walkSpeed) * Input.GetAxis("Horizontal")) * bhopMultiplier : 0;
        float movementDirectionY = moveDirection.y;
        moveDirection = (forward * curSpeedX) + (right * curSpeedY);

        if (Input.GetButton("Jump") && canMove && characterController.isGrounded)
        {
            moveDirection.y = jumpPower;
            bhopMultiplier = Mathf.Min(bhopMultiplier + bhopMultiplierIncrement, maxBhopSpeed / (isRunning ? runSpeed : walkSpeed));
            isJumping = true;
        }
        else
        {
            moveDirection.y = movementDirectionY;
        }

        if (!characterController.isGrounded)
        {
            moveDirection.y -= gravity * Time.deltaTime;
        }
        else if (!Input.GetButton("Jump"))
        {
            bhopMultiplier = 1f;
            isJumping = false;
        }

        characterController.Move(moveDirection * Time.deltaTime);

        if (canMove)
        {
            rotationX += -Input.GetAxis("Mouse Y") * lookSpeed;
            rotationX = Mathf.Clamp(rotationX, -lookXLimit, lookXLimit);
            playerCamera.transform.localRotation = Quaternion.Euler(rotationX, 0, 0);
            transform.rotation *= Quaternion.Euler(0, Input.GetAxis("Mouse X") * lookSpeed, 0);
        }
    }
}