using System;
using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.Serialization;

[RequireComponent(typeof(BoxCollider2D))]
[RequireComponent(typeof(Rigidbody2D))]
public class PlayerController2D : MonoBehaviour {
    [SerializeField] private float speed = 9;
    [FormerlySerializedAs("jumpHeight")] [SerializeField] private float jumpForce = 300;
    [SerializeField] private float movementSmoothing = .4f;
    [SerializeField] private LayerMask whatIsGround;
    [SerializeField] private bool allowAirControl = true;
    [FormerlySerializedAs("GroundedRadius")] [SerializeField] private float groundedRadius = .2f;
    [SerializeField] private bool isGrounded;
    [SerializeField] private bool isJoystickPlayer = false;

    private BoxCollider2D _boxCollider;
    private Rigidbody2D _rigidbody;
    private Vector2 _velocity = Vector2.zero;

    private void Awake() {
        _boxCollider = GetComponent<BoxCollider2D>();
        _rigidbody = GetComponent<Rigidbody2D>();
    }

    private void FixedUpdate() {
        isGrounded = false;

        Collider2D[] colliders = Physics2D.OverlapCircleAll(_boxCollider.bounds.min, groundedRadius, whatIsGround);
        foreach (Collider2D collider in colliders) {
            if (collider != _boxCollider) {
                isGrounded = true;
            }
        }
    }

    private void Update() {
        // get input depending on if we aisPre using gamepad or not
        float moveAmount;
        bool isJumping;
        if (isJoystickPlayer) {
            var gamepad = Gamepad.current;
            if (gamepad == null) {
                Debug.LogError("A gamepad player is present but no gamepad is connected");
            }

            moveAmount = gamepad.leftStick.ReadValue().x;

            isJumping = gamepad.aButton.wasPressedThisFrame;
        } else {
            var keyboard = Keyboard.current;
            if (keyboard == null) {
                Debug.LogError("A keyboard player is present but no keyboard is connected");
            }

            moveAmount = 0;
            moveAmount += keyboard.dKey.isPressed ? 1 : 0;
            moveAmount -= keyboard.aKey.isPressed ? 1 : 0;

            isJumping = keyboard.spaceKey.wasPressedThisFrame;
        }
        
        if (isGrounded || allowAirControl) {
            Vector2 target = new Vector2(moveAmount * speed, _rigidbody.velocity.y);
            _rigidbody.velocity = Vector2.SmoothDamp(_rigidbody.velocity, target, ref _velocity, movementSmoothing);
        }

        if (isGrounded && isJumping) {
            isGrounded = false;
            _rigidbody.AddForce(new Vector2(0f, jumpForce));
        }
    }
}