using UnityEngine;
using RR.Common.Interfaces;
using RR.Game2D.Core;
using RR.Game2D.Behaviour;
using RR.Game2D.Core.Interfaces;

namespace RR.Game2D.Entities.Projectiles
{
    [DisallowMultipleComponent]
    [RequireComponent(typeof(Rigidbody2D),
                      typeof(CapsuleCollider2D))]
    public class PickableProjectile : PhysicsProjectile, IPickable, IBouncy, IRecallable
    {
        public static PickableProjectile Instance { get; private set; }

        public enum State { Held, Airborne, Grounded, Returning }
        public State CurrentState { get; private set; } = State.Grounded;

        [Header("Подбор и прикрепление")]
        [SerializeField] private Vector3 heldLocalOffset = new(0.25f, 0.1f, 0f);
        [SerializeField] private float heldScale = 1.5f;
        [SerializeField] private float ignoreOwnerTimeOnThrow = 0.1f;

        [Header("Приземление")]
        [SerializeField] private float groundVelocity = 1f;
        [SerializeField] private float maxGroundSlideTime = 1f;
        [SerializeField] private bool lockWhenLanded = true;

        [Header("Отскоки")]
        [SerializeField] private int maxBounces = 3;
        [SerializeField] private float minBounceSpeed = 0.8f;
        [SerializeField] private float stickDelayAfterImpact = 0.03f;

        [Header("Возврат")]
        [SerializeField, Range(0, 100)] int recallScreenMarginPercent = 5;
        [SerializeField] private float recallArriveDistance = 1f;
        [SerializeField] private float recallSpeed = 16f;
        [SerializeField] private float recallStartDistance = 8f;

        [Header("Gizmos")]
        [SerializeField] private bool drawGizmos;
        [SerializeField] private Color gizmoColor = new (0.2f, 0.8f, 1f, 0.35f);

        private Transform holderAttachPoint;
        private int bounceCounter;
        private float lastImpactTime = -999f;
        private readonly Vector3 baseLocalScale = Vector3.one;

        private bool hadBeenHeld;
        private GameObject lastKnownHolder;
        private float lastGroundTouchTime;

        private GameObject jumpPad;

        // -------------------------------------------
        //                Методы Unity
        //
        
#region Unity Methods

        //---------------------------
        //        Singleton
        //---------------------------
        protected override void Awake()
        {
            rb = GetComponent<Rigidbody2D>();

            col = GetComponent<CapsuleCollider2D>();
            col.isTrigger = true;

            if (Instance != null && Instance != this)
            {
                Destroy(gameObject);
                return;
            }

            Instance = this;

            jumpPad = new GameObject("Projectile Jump Pad");
            jumpPad.AddComponent<BoxCollider2D>();
            jumpPad.AddComponent<JumpPad2D>();
            jumpPad.GetComponent<BoxCollider2D>().isTrigger = true;
            Vector3 jumpPadScale = jumpPad.transform.localScale;
            jumpPadScale.y = 0.1f;
            jumpPad.transform.localScale = jumpPadScale;
            jumpPad.SetActive(false);
            jumpPad.GetComponent<JumpPad2D>().PlayerJumped += OnPlayerJumped;
        }

        private void OnDestroy()
        {
            if (Instance == this) Instance = null;
            Destroy(jumpPad);
        }
        //---------------------------
        //
        //---------------------------

        private void Start()
        {
            rb.collisionDetectionMode = CollisionDetectionMode2D.Continuous;
            col.isTrigger = false;

            if (CurrentState != State.Held)
                BecomeGrounded();
        }

        protected override void FixedUpdate()
        {
            base.FixedUpdate();

            if (!lockWhenLanded && CurrentState == State.Airborne)
            {
                if (rb.linearVelocity.sqrMagnitude < (groundVelocity * groundVelocity))
                    BecomeGrounded();
            }

            if ((CurrentState == State.Airborne || CurrentState == State.Returning) && rb.linearVelocity.sqrMagnitude > 0.0001f)
                transform.up = rb.linearVelocity.normalized;

            if (CurrentState == State.Airborne && rb.linearVelocity.magnitude < groundVelocity)
                BecomeGrounded();

            if (hadBeenHeld && CurrentState != State.Held)
                Recall();
        }

        protected override void OnCollisionEnter2D(Collision2D collision)
        {
            var otherRb = collision.rigidbody ? collision.rigidbody : collision.otherRigidbody;
            var otherGO = (collision.collider ? collision.collider.attachedRigidbody?.gameObject : null)
                          ?? otherRb?.gameObject
                          ?? collision.gameObject;
            if (otherGO != null)
            {
                if (otherGO.CompareTag("Player") && CurrentState != State.Held)
                {
                    if (TryPickup(otherGO)) return;
                }
                else if (otherGO.CompareTag("Enemy"))
                {
                    EnemyController enemyController = otherGO.GetComponent<EnemyController>();
                    if (enemyController != null)
                    {
                        enemyController.TakeDamage(projectileDamage);
                    }
                }
            }

            if (!IsInHitLayer(collision.collider.gameObject.layer)) return;
            Vector2 point = collision.GetContact(0).point;
            OnHit(collision, point, collision.relativeVelocity);

            if (CurrentState == State.Airborne)
            {
                if (TryBounce(collision))
                {
                    lastImpactTime = Time.time;
                    return;
                }

                BecomeGrounded();
            }

            if (collision.collider.CompareTag("Ground"))
                lastGroundTouchTime = Time.time;
        }

        private void OnCollisionStay2D(Collision2D collision)
        {
            if (collision.collider.CompareTag("Ground"))
            {
                if (Time.time - lastGroundTouchTime > maxGroundSlideTime && CurrentState != State.Returning)
                    BecomeGrounded();
            }
        }


        protected override void OnTriggerEnter2D(Collider2D other)
        {
            if (other.CompareTag("Player"))
            {
                if (TryPickup(other.gameObject)) return;
            }
            else if (other.CompareTag("Enemy"))
            {
               other.TryGetComponent<EnemyController>(out var controller);
               controller.TakeDamage(projectileDamage);
            }
            else
            {
                base.OnTriggerEnter2D(other);
            }
        }
        //
        //
        // -------------------------------------------

#endregion

        // -------------------------------------------
        //      Переопределенные методы родителей
        //

#region Parent Methods 

        protected override void OnHit(Collision2D collision, Vector2 point, Vector2 relativeVelocity)
        {
            //TryDealDamage(collision.collider, point, relativeVelocity);
            PlayFX(point);

            OnImpactFinal(collision);
        }

        protected override void OnImpactFinal(Collision2D collision)
        {
            if (!TryBounce(collision) && CurrentState == State.Airborne)
                BecomeGrounded();
        }

        protected override void OnImpactFinal(Collider2D other)
        {
            if (Time.time - lastImpactTime > stickDelayAfterImpact && CurrentState == State.Airborne)
                BecomeGrounded();
        }
        
#endregion

        //
        //
        // -------------------------------------------
        
        // -------------------------------------------
        //                 Подбор
        //

#region Pickup
        
        public bool TryPickup(GameObject newOwner, Transform optionalAttachPoint = null)
        {
            if (CurrentState == State.Held) return true;

            owner = newOwner;
            lastKnownHolder = newOwner;

            holderAttachPoint = optionalAttachPoint ?? FindAttachPoint(newOwner);
            var fireScript = newOwner.GetComponent<PlayerFireScript>();
            if (!holderAttachPoint && fireScript != null)
                holderAttachPoint = fireScript.attachPoint;
            if (!holderAttachPoint)
                holderAttachPoint = newOwner.transform;

            rb.linearVelocity = Vector2.zero;
            rb.angularVelocity = 0f;
            rb.bodyType = RigidbodyType2D.Kinematic;
            col.enabled = false;

            transform.SetParent(holderAttachPoint);
            transform.SetPositionAndRotation(holderAttachPoint.TransformPoint(heldLocalOffset), new Quaternion(0, 90f, 0, 0));
            transform.localScale = baseLocalScale * heldScale;

            if (fireScript != null) fireScript.BindProjectile(this);

            //StartCoroutine(IgnoreOwnerTemporarily(owner, ignoreOwnerTimeOnThrow));

            CurrentState = State.Held;
            launched = false;
            hadBeenHeld = true;

            jumpPad.SetActive(false);

            return true;
        }

        /// <summary>
        /// Метод для получения точки привязки на игроке.
        /// </summary>
        /// <param name="holder">Игрок, который держит снаряд</param>
        /// <param name="preferred">Опциональная точка привязки. При передаче, снаряд будет привязан на нее</param>
        /// <returns>Transform attachPoint - точка привязки</returns>
        private Transform FindAttachPoint(GameObject holder, Transform preferred = null)
        {
            if (preferred) return preferred;

            PlayerFireScript fireScript = holder.GetComponent<PlayerFireScript>();
            if (fireScript && fireScript.attachPoint) return fireScript.attachPoint;

            return holder.transform;
        }
        
#endregion

        //
        //
        // -------------------------------------------

        // -------------------------------------------
        //                 Отскок
        //

#region Bounce
        
        public bool TryBounce(Collision2D collision)
        {
            if (Time.time - lastImpactTime < stickDelayAfterImpact) return true;

            if (bounceCounter > maxBounces) return false;

            Vector2 velocityIn = rb.linearVelocity;
            float speed = velocityIn.magnitude;

            if (speed < minBounceSpeed) return false;

            Vector2 direction = Vector2.Reflect(velocityIn, collision.contacts[0].normal);

            rb.linearVelocity = col.sharedMaterial.bounciness * direction;


            if (collision.collider.CompareTag("Ground") || collision.collider.CompareTag("Trap"))
                bounceCounter++;

            return true;
        }
        
#endregion
        
        //
        //
        // -------------------------------------------


        // -------------------------------------------
        //                 Запуск
        //
        
#region Launch
        
        public override void Launch(Vector2 direction, float speed = -1, GameObject thrower = null)
        {
            if (CurrentState == State.Held)
                transform.SetParent(null);

            owner = thrower;
            lastKnownHolder = thrower;
            holderAttachPoint = null;

            rb.bodyType = RigidbodyType2D.Dynamic;
            col.enabled = true;
            col.isTrigger = false;

            launched = true;

            Vector2 launchDirection = direction.sqrMagnitude > 0.0001f ? direction.normalized : Vector2.right;
            float finalSpeed = (speed > 0f) ? speed : initialSpeed;

            rb.linearVelocity = Vector2.zero;
            rb.angularVelocity = 0f;
            rb.AddForce(finalSpeed * rb.mass * launchDirection, ForceMode2D.Impulse);

            transform.up = launchDirection;
            transform.localScale = baseLocalScale;

            if (thrower != null && ignoreOwnerTimeOnThrow > 0f)
                StartCoroutine(IgnoreOwnerTemporarily(thrower, ignoreOwnerTimeOnThrow));

            CurrentState = State.Airborne;
            bounceCounter = 0;
        }
        
#endregion
        
        //
        //
        // -------------------------------------------

        // -------------------------------------------
        //                 Возвращение
        //

#region Recall
        
        public void Recall()
        {
            GameObject playerGo = lastKnownHolder;

            if (playerGo == null || !playerGo.activeInHierarchy)
                playerGo = (GameManager.Instance && GameManager.Instance.PlayerObj)
                            ? GameManager.Instance.PlayerObj
                            : GameObject.FindWithTag("Player");

            if (!playerGo) return;

            var attachPoint = FindAttachPoint(playerGo);

            bool isVisible;
            var mainCamera = Camera.main;
            float margin = recallScreenMarginPercent / 100f;

            if (mainCamera)
            {
                Vector3 viewPoint = mainCamera.WorldToViewportPoint(transform.position);
                isVisible = viewPoint.x >= -margin && viewPoint.x <= 1f + margin
                         && viewPoint.y >= -margin && viewPoint.y <= 1f + margin;
            }
            else
            {
                Vector2 toOwnerTest = (Vector2)attachPoint.position - rb.position;
                isVisible = (toOwnerTest.magnitude <= recallStartDistance);
            }

            Vector2 toOwner = (Vector2)attachPoint.position - rb.position;
            float dist = toOwner.magnitude;

            if (CurrentState != State.Returning)
            {
                if (!isVisible)
                {
                    CurrentState = State.Returning;
                    rb.bodyType = RigidbodyType2D.Dynamic;
                    col.isTrigger = true;
                }
                else
                {
                    return;
                }
            }

            Vector2 dir = (dist > 0.001f) ? (toOwner / dist) : rb.linearVelocity.normalized;
            rb.linearVelocity = dir * recallSpeed;

            if (rb.linearVelocity.sqrMagnitude > 0.01f)
                transform.up = rb.linearVelocity.normalized;

            if (dist <= recallArriveDistance)
                TryPickup(playerGo);
        }

#endregion

        //
        //
        // -------------------------------------------
        
        // -------------------------------------------
        //        Собственные незаисимые методы
        //

#region Self methods
        
        /// <summary>
        /// Метод для заморозки снаряда на земле.
        /// </summary>
        private void BecomeGrounded()
        {
            launched = false;
            CurrentState = State.Grounded;

            if (lockWhenLanded)
            {
                rb.linearVelocity = Vector2.zero;
                rb.angularVelocity = 0f;
                rb.bodyType = RigidbodyType2D.Kinematic;
            }
            else
            {
                rb.bodyType = RigidbodyType2D.Dynamic;
            }

            col.enabled = true;
            col.isTrigger = true;

            transform.SetParent(null, true);
            bounceCounter = 0;

            MoveJumpPad();
            jumpPad.SetActive(true);
        }
        
        /// <summary>
        /// Метод для перемещения прыжковой платформы Тамагочика
        /// </summary>
        private void MoveJumpPad()
        {
            float sizeX = col.bounds.size.y;
            float sizeY = col.bounds.size.x;

            Vector3 jumpPadPos = transform.position;

            float jumpPadY = Mathf.Sqrt(sizeX * sizeX * Mathf.Pow(Mathf.Cos(transform.localEulerAngles.z), 2) + sizeY * sizeY * Mathf.Pow(Mathf.Sin(transform.localEulerAngles.z), 2));

            jumpPadPos.y = jumpPadPos.y + 0.5f * jumpPadY;
            jumpPad.transform.position = jumpPadPos;
        }

        /// <summary>
        /// Метод для обработки событий при отпрыгивания игрока от прыжковой платформы.
        /// </summary>
        /// <param name="playerObj"></param>
        private void OnPlayerJumped(GameObject playerObj)
        {
            TryPickup(playerObj);
        }

#endregion
        
        //
        //
        // -------------------------------------------
    }
}