using System;
using AppleHills.Data.CardSystem;
using Core.SaveLoad;
using UnityEngine;

namespace UI.CardSystem.StateMachine
{
    /// <summary>
    /// Shared context for card states.
    /// Provides access to common components and data that states need.
    /// </summary>
    public class CardContext : MonoBehaviour
    {
        [Header("Core Components")]
        [SerializeField] private CardDisplay cardDisplay;
        [SerializeField] private CardAnimator cardAnimator;
        private AppleMachine stateMachine;
        
        [Header("Card Data")]
        private CardData cardData;
        
        // Injected dependencies
        private AlbumViewPage albumViewPage;
        
        // Public accessors
        public CardDisplay CardDisplay => cardDisplay;
        public CardAnimator Animator => cardAnimator;
        public AppleMachine StateMachine => stateMachine;
        public Transform RootTransform => transform;
        public CardData CardData => cardData;
        
        /// <summary>
        /// Get the injected AlbumViewPage (null if not set)
        /// </summary>
        public AlbumViewPage AlbumViewPage => albumViewPage;
        
        // Runtime state
        public bool IsClickable { get; set; } = true;
        
        // Original transform data (captured on spawn for shrink animations)
        public Vector3 OriginalScale { get; private set; }
        public Vector3 OriginalPosition { get; private set; }
        public Quaternion OriginalRotation { get; private set; }
        
        // Generic drag event - fired when drag starts, consumers decide how to handle based on current state
        public event Action<CardContext> OnDragStarted;
        
        // Generic drag end event - fired when drag ends, consumers decide how to handle based on current state
        public event Action<CardContext> OnDragEnded;
        
        // Booster-specific context (optional, only set for booster flow cards)
        private BoosterCardContext boosterContext;
        public BoosterCardContext BoosterContext
        {
            get
            {
                if (boosterContext == null)
                    boosterContext = new BoosterCardContext();
                return boosterContext;
            }
        }
        
        /// <summary>
        /// Inject AlbumViewPage dependency
        /// </summary>
        public void SetAlbumViewPage(AlbumViewPage page)
        {
            albumViewPage = page;
        }
        
        // Helper method for states/card to signal drag started
        public void NotifyDragStarted()
        {
            OnDragStarted?.Invoke(this);
        }
        
        // Helper method for states/card to signal drag ended
        public void NotifyDragEnded()
        {
            OnDragEnded?.Invoke(this);
        }
        
        private void Awake()
        {
            // Auto-find components if not assigned
            if (cardDisplay == null)
                cardDisplay = GetComponentInChildren<CardDisplay>();
            
            if (cardAnimator == null)
                cardAnimator = GetComponent<CardAnimator>();
            
            if (stateMachine == null)
                stateMachine = GetComponentInChildren<AppleMachine>();
        }

        private void OnEnable()
        {
            // Subscribe to CardDisplay click and route to active state
            if (cardDisplay != null)
            {
                cardDisplay.OnCardClicked += HandleCardDisplayClicked;
            }
        }

        private void OnDisable()
        {
            if (cardDisplay != null)
            {
                cardDisplay.OnCardClicked -= HandleCardDisplayClicked;
            }
        }

        private void HandleCardDisplayClicked(CardDisplay _)
        {
            // Gate by clickability
            if (!IsClickable) return;
            if (stateMachine == null || stateMachine.currentState == null) return;

            var handler = stateMachine.currentState.GetComponent<ICardClickHandler>();
            if (handler != null)
            {
                handler.OnCardClicked(this);
            }
        }
        
        /// <summary>
        /// Setup the card with data
        /// </summary>
        public void SetupCard(CardData data)
        {
            cardData = data;
            
            // Reset booster context if it exists
            if (boosterContext != null)
            {
                boosterContext.Reset();
            }

            // Capture original transform for shrink animations.
            // If current scale is ~0 (pop-in staging), default to Vector3.one.
            var currentScale = transform.localScale;
            if (currentScale.x < 0.01f && currentScale.y < 0.01f && currentScale.z < 0.01f)
            {
                OriginalScale = Vector3.one;
            }
            else
            {
                OriginalScale = currentScale;
            }
            OriginalPosition = transform.localPosition;
            OriginalRotation = transform.localRotation;
            
            if (cardDisplay != null)
            {
                cardDisplay.SetupCard(data);
            }
        }
        
        /// <summary>
        /// Update card data without re-capturing original transform values.
        /// Use this when assigning data to an already-initialized card (e.g., pending cards on drag).
        /// This prevents changing OriginalScale when the card is already correctly sized.
        /// </summary>
        public void UpdateCardData(CardData data)
        {
            cardData = data;
            
            // Reset booster context if it exists
            if (boosterContext != null)
            {
                boosterContext.Reset();
            }
            
            // Don't re-capture OriginalScale/Position/Rotation
            // This preserves the transform values captured during initial setup
            
            if (cardDisplay != null)
            {
                cardDisplay.SetupCard(data);
            }
        }
        
        /// <summary>
        /// Get the card display component
        /// </summary>
        public CardDisplay GetCardDisplay() => cardDisplay;
    }
}