using UnityEngine;

[DisallowMultipleComponent]
[RequireComponent(typeof(Rigidbody2D), typeof(Collider2D))]
public class PlayerController : MonoBehaviour
{

    [Header("Горизонтальное движение")]
    public float moveSpeed = 8f;
    public float accel = 40f;
    public float decel = 20f;

    [Header("Вертикальное движение")]
    public float maxJumpHeight = 5f;
    public float jumpCooldown = 0.1f;
    public float jumpBuffer = 0.1f;
    [Range(0f, 1f)] public float jumpCut = 0.5f;

    private float spriteScale = 0.35f;

    private Rigidbody2D rb;
    private Collider2D col;

    float inputX;
    float lastGroundedTime;
    float lastJumpPressedTime;

    bool IsGrounded => Grounded();

    [Header("Аниматор [Опционально]")]
    [SerializeField] private Animator animator; // оставить в инспекторе на всякий случай

    void Awake()
    {
        rb = GetComponent<Rigidbody2D>();
        col = GetComponent<Collider2D>();
        rb.freezeRotation = true;
        lastJumpPressedTime = -999f;

        // если не задано в инспекторе — находим автоматически
        if (animator == null)
            animator = GetComponent<Animator>();
        if (animator == null)
            animator = GetComponentInChildren<Animator>(true);

        if (animator == null)
            Debug.LogError($"[{name}] Animator не найден!");
    }

    void Update()
    {
        inputX = Input.GetAxisRaw("Horizontal");

        if (Input.GetButtonDown("Jump"))
            lastJumpPressedTime = Time.time;

        if (Input.GetButtonUp("Jump")) // && rb.linearVelocity.y > 0f)
            rb.linearVelocity = new Vector2(rb.linearVelocity.x, rb.linearVelocity.y * jumpCut);

        if (inputX != 0f)
            transform.localScale = new Vector3(Mathf.Sign(inputX) * spriteScale, spriteScale, spriteScale);

        if (IsGrounded) lastGroundedTime = Time.time;

        animator.SetFloat("Speed", Mathf.Abs(rb.linearVelocity.x));
        animator.SetFloat("VSpeed", rb.linearVelocity.y);
        animator.SetBool("Grounded", IsGrounded);
    }



    void FixedUpdate()
    {
        float target = inputX * moveSpeed;
        float rate = (Mathf.Abs(target) > 0.01f) ? accel : decel;
        float vx = Mathf.MoveTowards(rb.linearVelocity.x, target, rate * Time.fixedDeltaTime);

        if (transform.position.y < -5) Die();

        bool canJump = (Time.time - lastGroundedTime) <= jumpCooldown;
        bool wantJump = (Time.time - lastJumpPressedTime) <= jumpBuffer;

        if (wantJump && canJump && IsGrounded)
        {
            float vy = CalcJumpSpeed(maxJumpHeight);
            rb.linearVelocity = new Vector2(vx, vy);
            animator.SetBool("Jump", true);
            lastJumpPressedTime = -999f;
            return;
        }

        rb.linearVelocity = new Vector2(vx, rb.linearVelocity.y);
    }

    float CalcJumpSpeed(float height)
    {
        float g = Physics2D.gravity.y * rb.gravityScale;

        return Mathf.Sqrt(-2f * g * height);
    }

    bool Grounded()
    {
        RaycastHit2D hit = Physics2D.CircleCast(new Vector2(col.bounds.center.x, col.bounds.min.y), 0.01f, Vector2.down, 0.1f);
        bool isGrounded = hit.collider != null;

        animator.SetBool("Jump", !isGrounded);

        return isGrounded;
    }

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.CompareTag("Coin"))
        {
            GameManager.Instance.AddCoin();
            Destroy(collision.gameObject);
        }

        if (collision.CompareTag("Finish"))
        {
            GameManager.Instance.NextLevel();
        }
    }

    public void Die()
    {
        GameManager.Instance.ResetLevel();
    }
}