using System.Collections.Generic;
using UI.DragAndDrop.Core;
using UnityEngine;

namespace UI.CardSystem
{
    /// <summary>
    /// Helper utility for shuffling draggable objects in a SlotContainer.
    /// Moves objects to occupy the first available slots (0, 1, 2, etc.)
    /// </summary>
    public static class SlotContainerHelper
    {
        /// <summary>
        /// Shuffles draggable objects to always occupy the first available slots.
        /// Unassigns all objects from their current slots, then reassigns them starting from slot 0.
        /// </summary>
        /// <param name="container">The slot container holding the slots</param>
        /// <param name="objects">List of draggable objects to shuffle</param>
        /// <param name="animate">Whether to animate the movement</param>
        public static void ShuffleToFront(SlotContainer container, List<DraggableObject> objects, bool animate = true)
        {
            if (container == null || objects == null || objects.Count == 0)
                return;
            
            Debug.Log($"[SlotContainerHelper] Shuffling {objects.Count} objects to front slots");
            
            // Unassign all objects from their current slots
            foreach (var obj in objects)
            {
                if (obj.CurrentSlot != null)
                {
                    obj.CurrentSlot.Vacate();
                }
            }
            
            // Reassign objects to first N slots starting from slot 0
            for (int i = 0; i < objects.Count; i++)
            {
                DraggableSlot targetSlot = FindSlotByIndex(container, i);
                DraggableObject obj = objects[i];
                
                if (targetSlot != null)
                {
                    Debug.Log($"[SlotContainerHelper] Assigning object to slot with SlotIndex {i}");
                    obj.AssignToSlot(targetSlot, animate);
                }
                else
                {
                    Debug.LogWarning($"[SlotContainerHelper] Could not find slot with SlotIndex {i}");
                }
            }
        }
        
        /// <summary>
        /// Find a slot by its SlotIndex property (not list position)
        /// </summary>
        private static DraggableSlot FindSlotByIndex(SlotContainer container, int slotIndex)
        {
            foreach (var slot in container.Slots)
            {
                if (slot.SlotIndex == slotIndex)
                {
                    return slot;
                }
            }
            return null;
        }
    }
}