using UnityEngine;
using RR.Game2D.Core;

namespace RR.Game2D.Behaviour
{
    [DisallowMultipleComponent]
    [RequireComponent(typeof(Rigidbody2D),
                      typeof(Collider2D),
                      typeof(Animator))]
    public class PlayerController : MonoBehaviour
    {

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

        [Header("Вертикальное движение")]
        [SerializeField] private float maxJumpHeight = 5f;
        [SerializeField] private float jumpCooldown = 0.1f;
        [SerializeField] private float jumpBuffer = 0.1f;
        [SerializeField, Range(0f, 1f)] private 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()
        {
            // Передвижение
            inputX = Input.GetAxisRaw("Horizontal");

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

            if (Input.GetButton("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;

            // Данные для анимаций
            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();

            // Возможность прыжка
            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);
        }

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

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

        //private void OnDestroy() => Debug.Log("Player destroyed");


        /// <summary>
        /// Метод для просчитывания скорости прыжка с учетом высоты прыжка
        /// </summary>
        /// <param name="height">Высота прыжка (высшая точка по y)</param>
        /// <returns>float jumpSpeed - высчитанная скорость прыжка</returns>
        float CalcJumpSpeed(float height)
        {
            float g = Physics2D.gravity.y * rb.gravityScale;

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

        /// <summary>
        /// Метод для проверки соприкосновения с землей
        /// </summary>
        /// <returns>bool isGrounded - на земле ли игрок</returns>
        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;
        }

        /// <summary>
        /// Метод смерти персонажа.
        /// Базовое поведение - сброс уровня в GameManager
        /// </summary>
        public void Die()
        {
            GameManager.Instance.ResetLevel();
        }
    }
}