using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using Bansonic;

#if UNITY_EDITOR
using UnityEditor;
#endif

public class equipBag : MonoBehaviour
{
    [Header("prefab")]
    public GameObject eqpmtItemPrefab;
    public Transform eqpmtItemParent;

    [Header("source paths")]
    public string runtimeEquipmentFolder = "so/uEquip";
    public string editorEquipmentFolder = "Assets/Resources/so/uEquip";

    private readonly List<GameObject> spawnedItems = new List<GameObject>();

    private void Start()
    {
        Rebuild();
    }

    private void OnEnable()
    {
        Rebuild();
    }

    public void Rebuild()
    {
        ClearSpawnedItems();

        if (eqpmtItemPrefab == null || eqpmtItemParent == null)
        {
            return;
        }

        equipmentSO[] equipments = LoadEquipments();
        if (equipments == null || equipments.Length == 0)
        {
            return;
        }

        equipments = equipments
            .Where(equipment => equipment != null
                && !equipSmelt.IsEquipmentAssignedToSmeltPool(equipment)
                && !equipSmelt.IsEquipmentConsumedBySmelt(equipment))
            .ToArray();

        Array.Sort(equipments, CompareEquipments);

        for (int i = 0; i < equipments.Length; i++)
        {
            equipmentSO equipment = equipments[i];
            if (equipment == null)
            {
                continue;
            }

            GameObject instance = Instantiate(eqpmtItemPrefab, eqpmtItemParent);
            instance.name = string.IsNullOrWhiteSpace(equipment.GetCurrentTierDisplayName())
                ? equipment.name
                : equipment.GetCurrentTierDisplayName();

            equipItemPrefab item = instance.GetComponent<equipItemPrefab>();
            if (item != null)
            {
                item.Bind(equipment, HandleEquipmentClicked);
            }

            spawnedItems.Add(instance);
        }
    }

    private equipmentSO[] LoadEquipments()
    {
        var results = new List<equipmentSO>();
#if UNITY_EDITOR
        if (!Application.isPlaying)
        {
            results.AddRange(LoadEditorEquipments());
        }
        else
#endif
        {
            results.AddRange(Resources.LoadAll<equipmentSO>(runtimeEquipmentFolder)
                .Where(equipment => equipment != null));
        }

        IReadOnlyList<equipmentSO> runtimeGenerated = equipmentGenerator.GetRuntimeGeneratedEquipments();
        if (runtimeGenerated != null)
        {
            for (int i = 0; i < runtimeGenerated.Count; i++)
            {
                equipmentSO equipment = runtimeGenerated[i];
                if (equipment != null && !results.Contains(equipment))
                {
                    results.Add(equipment);
                }
            }
        }

        return results
            .Where(equipment => equipment != null)
            .ToArray();
    }

#if UNITY_EDITOR
    private equipmentSO[] LoadEditorEquipments()
    {
        if (string.IsNullOrWhiteSpace(editorEquipmentFolder) || !AssetDatabase.IsValidFolder(editorEquipmentFolder))
        {
            return Array.Empty<equipmentSO>();
        }

        string[] guids = AssetDatabase.FindAssets("t:equipmentSO", new[] { editorEquipmentFolder });
        var result = new List<equipmentSO>(guids.Length);

        for (int i = 0; i < guids.Length; i++)
        {
            string path = AssetDatabase.GUIDToAssetPath(guids[i]);
            equipmentSO equipment = AssetDatabase.LoadAssetAtPath<equipmentSO>(path);
            if (equipment != null)
            {
                result.Add(equipment);
            }
        }

        return result.ToArray();
    }
#endif

    private void HandleEquipmentClicked(equipmentSO equipment)
    {
        if (equipment == null)
        {
            return;
        }
    }

    private void ClearSpawnedItems()
    {
        if (eqpmtItemParent != null)
        {
            for (int i = eqpmtItemParent.childCount - 1; i >= 0; i--)
            {
                Transform child = eqpmtItemParent.GetChild(i);
                if (child == null)
                {
                    continue;
                }

#if UNITY_EDITOR
                if (!Application.isPlaying)
                {
                    DestroyImmediate(child.gameObject);
                }
                else
#endif
                {
                    Destroy(child.gameObject);
                }
            }
        }

        spawnedItems.Clear();
    }

    private static int CompareEquipments(equipmentSO left, equipmentSO right)
    {
        if (left == right)
        {
            return 0;
        }

        if (left == null)
        {
            return 1;
        }

        if (right == null)
        {
            return -1;
        }

        int levelCompare = right.level.CompareTo(left.level);
        if (levelCompare != 0)
        {
            return levelCompare;
        }

        string leftName = left.GetCurrentTierDisplayName();
        string rightName = right.GetCurrentTierDisplayName();
        return string.Compare(leftName, rightName, StringComparison.Ordinal);
    }
}