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

[RequireComponent(typeof(Rigidbody))]
[RequireComponent(typeof(CapsuleCollider))]
public class RigidbodyPlayer : MonoBehaviour
{
    public float speed = 10.0f;
    public float gravity = 10.0f;
    public float maxVelocityChange = 10.0f;
    public bool canJump = true;
    public float jumpHeight = 2.0f;
    private bool grounded = false;
    private Rigidbody rb;

    void Awake()
    {
        rb = GetComponent<Rigidbody>();
        rb.freezeRotation = true;
        rb.useGravity = false;
    }

    void FixedUpdate()
    {
        if (Physics.CheckCapsule(transform.position + transform.up * 0.5f, transform.position + transform. up * -0.6f, 0.5f))
        {
            grounded = true;
        }

        // Calculate how fast we should be moving
        Vector3 targetVelocity = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
        targetVelocity = transform.TransformDirection(targetVelocity);
        targetVelocity *= speed;

        // Apply a force that attempts to reach our target velocity
        Vector3 velocity = rb.velocity;
        Vector3 velocityChange = (targetVelocity - velocity);
        velocityChange.x = Mathf.Clamp(velocityChange.x, -maxVelocityChange, maxVelocityChange);
        velocityChange.z = Mathf.Clamp(velocityChange.z, -maxVelocityChange, maxVelocityChange);
        velocityChange.y = 0;
        rb.AddForce(velocityChange, ForceMode.VelocityChange);
        if (grounded)
        {
                // Jump
            if (canJump && Input.GetButton("Jump"))
            {
                rb.velocity = new Vector3(velocity.x, CalculateJumpVerticalSpeed(), velocity.z);
            }
        }

        // We apply gravity manually for more tuning control
        rb.AddForce(new Vector3(0, -gravity * rb.mass, 0));

        grounded = false;
    }


    //void OnCollisionStay()
    //{
    //    grounded = true;
    //}

    float CalculateJumpVerticalSpeed()
    {
        // From the jump height and gravity we deduce the upwards speed
        // for the character to reach at the apex.
        return Mathf.Sqrt(2 * jumpHeight * gravity);
    }

    void Start()
    {
        Cursor.lockState = CursorLockMode.Locked;

    }

    void Update()
    {

    }
}