using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using System.Reflection;
using BrewMonster.Network;
using BrewMonster;
using ModelRenderer.Scripts.GameData;

namespace PerfectWorld.Scripts.Managers
{
    public class EC_InventoryUI : MonoBehaviour
    {
        [Header("Pack Buttons (assign in Inspector)")]
        [SerializeField] private List<Button> inventoryPackButtons = new List<Button>(); // byPackage: 0
        [SerializeField] private List<Button> equipmentPackButtons = new List<Button>(); // byPackage: 1
        [SerializeField] private List<Button> fashionPackButtons = new List<Button>();   // byPackage: 3

        [Header("Detail Panel (assign in Inspector)")]
        [SerializeField] private GameObject detailPanelRoot;
        [SerializeField] private bool hideDetailOnStart = true;
        [SerializeField] private TextOutlet nameText;
        [SerializeField] private TextOutlet templateIdText;
        [SerializeField] private TextOutlet countText;
        [SerializeField] private TextOutlet slotText;
        [SerializeField] private TextOutlet packageText;
        [SerializeField] private TextOutlet stateText;
        [SerializeField] private TextOutlet expireText;
        [SerializeField] private TextOutlet crcText;
        [SerializeField] private TextOutlet contentLenText;
        [SerializeField] private Button equipButton;
        [SerializeField] private Button dropButton;

        [Header("Inventory Settings")]
        [SerializeField] private bool autoRefresh = true;
        [SerializeField] private float refreshInterval = 1.0f;

        private float lastRefreshTime;

        private InventoryModel model;
        private InventoryView view;
        
        // Current selected item for equip/unequip operations
        private byte currentSelectedPackage;
        private int currentSelectedSlot;
        private InventoryItemData currentSelectedItem;

        private const byte PKG_INVENTORY = 0;
        private const byte PKG_EQUIPMENT = 1;
        private const byte PKG_FASHION = 3; // Note: byPackage 3 used for Fashion

        private void Awake()
        {
            model = new InventoryModel();
            view = new InventoryView();
        }

        private void Start()
        {
            RefreshAll();
            if (hideDetailOnStart)
            {
                ShowDetailPanel(false);
            }
        }

        private void Update()
        {
            if (autoRefresh && Time.time - lastRefreshTime >= refreshInterval)
            {
                RefreshAll();
            }
        }

        public void RefreshAll()
        {
            lastRefreshTime = Time.time;

            var invItems = model.GetInventoryData(PKG_INVENTORY);
            var eqpItems = model.GetInventoryData(PKG_EQUIPMENT);
            var fshItems = model.GetInventoryData(PKG_FASHION);

            view.RenderPackage(inventoryPackButtons, invItems, PKG_INVENTORY, OnInventoryButtonClicked, GetDisplayTextForItem);
            view.RenderPackage(equipmentPackButtons, eqpItems, PKG_EQUIPMENT, OnInventoryButtonClicked, GetDisplayTextForItem);
            view.RenderPackage(fashionPackButtons, fshItems, PKG_FASHION, OnInventoryButtonClicked, GetDisplayTextForItem);
        }

        private void OnInventoryButtonClicked(byte package, int slot)
        {
            UnityGameSession.RequestCheckSecurityPassWd("");
            var data = model.GetInventoryData(package);
            if (data != null && data.TryGetValue(slot, out var itemData))
            {
                // Store current selection for equip/unequip operations
                currentSelectedPackage = package;
                currentSelectedSlot = slot;
                currentSelectedItem = itemData;
                
                FillDetailPanel(package, itemData);
            }
            else
            {
                ShowDetailPanel(false);
            }
        }

        private string GetDisplayTextForItem(int slot, InventoryItemData itemData)
        {
            if (itemData == null || itemData.Count <= 0)
            {
                return string.Empty;
            }
            string itemName = EC_IvtrItem.ResolveItemName(itemData.TemplateId);
            string displayText = string.IsNullOrEmpty(itemName) ? $"Item {itemData.TemplateId}" : itemName;
            if (itemData.Count > 1)
            {
                displayText += $" x{itemData.Count}";
            }
            return displayText;
        }

        public void ToggleAutoRefresh()
        {
            autoRefresh = !autoRefresh;
        }

        public void SetRefreshInterval(float interval)
        {
            refreshInterval = Mathf.Max(0.1f, interval);
        }

        public void OnEquipButtonClicked()
        {
            if (currentSelectedItem == null)
            {
                Debug.LogWarning("[InventoryUI] No item selected for equip/unequip operation");
                return;
            }

            if (currentSelectedPackage == PKG_INVENTORY)
            {
                // Equipping from inventory
                EquipItem();
            }
            else if (currentSelectedPackage == PKG_EQUIPMENT)
            {
                // Unequipping from equipment
                UnequipItem();
            }
            else
            {
                Debug.LogWarning($"[InventoryUI] Equip/Unequip not supported for package {currentSelectedPackage}");
            }
        }

        public void OnDropButtonClicked()
        {
            if (currentSelectedItem == null)
            {
                Debug.LogWarning("[InventoryUI] No item selected for drop operation");
                return;
            }

            if (currentSelectedPackage == PKG_INVENTORY)
            {
                // Dropping from inventory
                DropInventoryItem();
            }
            else if (currentSelectedPackage == PKG_EQUIPMENT)
            {
                // Dropping from equipment
                DropEquipItem();
            }
            else
            {
                Debug.LogWarning($"[InventoryUI] Drop not supported for package {currentSelectedPackage}");
            }
        }

        private void EquipItem()
        {
            if (currentSelectedItem == null) return;

            // For equipping, we need to find an empty equipment slot
            // Use the new method that checks for available slots (especially for finger items)
            byte equipLocation = EC_IvtrType.GetAvailableEquipLocationForItem(currentSelectedItem.TemplateId);
            if (equipLocation >= (byte)EC_IvtrType.IndexOfIteminEquipmentInventory.SIZE_EQUIPIVTR)
            {
                Debug.LogWarning($"[InventoryUI] Could not determine equip location for item {currentSelectedItem.TemplateId}");
                return;
            }

            // Call RequestEquipItemAsync with inventory slot and equip location
            UnityGameSession.RequestEquipItemAsync((byte)currentSelectedSlot, equipLocation, () =>
            {
                Debug.Log($"[InventoryUI] Equip request sent for item {currentSelectedItem.TemplateId} from slot {currentSelectedSlot} to equip location {equipLocation}");
                // Refresh inventory after equip
                RefreshAll();
            });
        }

        private void UnequipItem()
        {
            if (currentSelectedItem == null) return;

            // Find empty slot in PACK_INVENTORY
            int emptySlot = FindEmptyInventorySlot();
            if (emptySlot == -1)
            {
                Debug.LogWarning("[InventoryUI] No empty slots available in inventory for unequipping");
                return;
            }

            // For unequipping, the equip location is the current equipment slot
            // We can use the slot number as the equip location
            byte equipLocation = (byte)currentSelectedSlot;

            // Call RequestEquipItemAsync with empty inventory slot and current equip location
            UnityGameSession.RequestEquipItemAsync((byte)emptySlot, equipLocation, () =>
            {
                Debug.Log($"[InventoryUI] Unequip request sent for item {currentSelectedItem.TemplateId} from equip location {equipLocation} to inventory slot {emptySlot}");
                // Refresh inventory after unequip
                RefreshAll();
            });
        }

        private void DropInventoryItem()
        {
            if (currentSelectedItem == null) return;

            // Call RequestDropIvrtItem with slot index and amount
            UnityGameSession.RequestDropIvrtItem((byte)currentSelectedSlot, 1);
            Debug.Log($"[InventoryUI] Drop request sent for inventory item {currentSelectedItem.TemplateId} from slot {currentSelectedSlot} with amount {currentSelectedItem.Count}");
            
            // Refresh inventory after drop
            RefreshAll();
        }

        private void DropEquipItem()
        {
            if (currentSelectedItem == null) return;

            // Call RequestDropEquipItem with slot index
            UnityGameSession.RequestDropEquipItem((byte)currentSelectedSlot);
            Debug.Log($"[InventoryUI] Drop request sent for equipment item {currentSelectedItem.TemplateId} from slot {currentSelectedSlot}");
            
            // Refresh inventory after drop
            RefreshAll();
        }

        
        private int FindEmptyInventorySlot()
        {
            var inventoryData = model.GetInventoryData(PKG_INVENTORY);
            if (inventoryData == null) return -1;

            // Find first empty slot (assuming slots are numbered 0, 1, 2, ...)
            for (int i = 0; i < 100; i++) // Assuming max 100 inventory slots
            {
                if (!inventoryData.ContainsKey(i))
                {
                    return i;
                }
            }
            return -1;
        }

        // Equipment indices and resolution helpers moved to EC_IvtrType

        // === MVC: Model ===
        private class InventoryModel
        {
            private readonly FieldInfo itemsByPackageField;

            public InventoryModel()
            {
                var inventoryType = typeof(EC_Inventory);
                itemsByPackageField = inventoryType.GetField("_itemsByPackage", BindingFlags.NonPublic | BindingFlags.Static);
                if (itemsByPackageField == null)
                {
                    Debug.LogError("[InventoryUI] Could not access _itemsByPackage field from EC_Inventory");
                }
            }

            public Dictionary<int, InventoryItemData> GetInventoryData(byte package)
            {
                if (itemsByPackageField == null)
                {
                    return new Dictionary<int, InventoryItemData>();
                }
                var itemsByPackage = itemsByPackageField.GetValue(null) as Dictionary<byte, Dictionary<int, InventoryItemData>>;
                if (itemsByPackage == null)
                {
                    return new Dictionary<int, InventoryItemData>();
                }
                if (itemsByPackage.TryGetValue(package, out var packageItems))
                {
                    return packageItems;
                }
                return new Dictionary<int, InventoryItemData>();
            }
        }

        // === MVC: View ===
        private class InventoryView
        {
            private static readonly Dictionary<Image, Sprite> _defaultSprites = new Dictionary<Image, Sprite>();

            public void RenderPackage(List<Button> buttons, Dictionary<int, InventoryItemData> items, byte package, System.Action<byte, int> onClick, System.Func<int, InventoryItemData, string> getDisplayText)
            {
                if (buttons == null)
                {
                    return;
                }

                for (int slot = 0; slot < buttons.Count; slot++)
                {
                    var button = buttons[slot];
                    if (button == null)
                    {
                        continue;
                    }

                    InventoryItemData itemData = null;
                    bool hasItem = items != null && items.TryGetValue(slot, out itemData);
                    button.onClick.RemoveAllListeners();
                    int capturedSlot = slot;
                    button.onClick.AddListener(() => onClick(package, capturedSlot));   
                    // Optional visual tweaks based on state/count
                    var image = button.GetComponent<Image>();
                    if (image != null)
                    {
                        // Store the default sprite if we haven't seen this image before
                        if (!_defaultSprites.ContainsKey(image))
                        {
                            _defaultSprites[image] = image.sprite;
                        }

                        // Set icon sprite based on item TemplateId
                        if (hasItem && itemData != null && itemData.Count > 0)
                        {
                            var sprite = EC_IvtrItem.ResolveItemIconSprite(itemData.TemplateId);
                            image.sprite = sprite;
                            image.enabled = true;
                        }
                        else
                        {
                            // Restore the default sprite instead of setting to null
                            image.sprite = _defaultSprites[image];
                            image.enabled = true;
                        }
                    }
                }
            }
        }

        // === Detail Panel Helpers ===
        [System.Serializable]
        private class TextOutlet
        {
            [SerializeField] public Text legacy;
            [SerializeField] public TMPro.TextMeshProUGUI tmp;

            public void Set(string value)
            {
                if (legacy != null)
                {
                    legacy.text = value ?? string.Empty;
                }
                if (tmp != null)
                {
                    tmp.text = value ?? string.Empty;
                }
            }
        }

        private void ShowDetailPanel(bool show)
        {
            if (detailPanelRoot != null)
            {
                detailPanelRoot.SetActive(show);
            }
        }

        private void FillDetailPanel(byte package, InventoryItemData item)
        {
            if (item == null)
            {
                ShowDetailPanel(false);
                return;
            }

            string name = EC_IvtrItem.ResolveItemName(item.TemplateId);
            nameText?.Set(string.IsNullOrEmpty(name) ? $"Item {item.TemplateId}" : name);
            templateIdText?.Set(item.TemplateId.ToString());
            countText?.Set(item.Count.ToString());
            slotText?.Set(item.Slot.ToString());
            packageText?.Set(GetPackageName(package));
            stateText?.Set(item.State.ToString());
            expireText?.Set(item.ExpireDate.ToString());
            crcText?.Set(item.Crc.ToString());
            contentLenText?.Set((item.Content?.Length ?? 0).ToString());

            // Setup equip and drop buttons
            SetupEquipButton(package, item);
            SetupDropButton(package, item);

            ShowDetailPanel(true);
        }

        private void SetupEquipButton(byte package, InventoryItemData item)
        {
            if (equipButton == null) return;

            // Clear previous listeners
            equipButton.onClick.RemoveAllListeners();
            equipButton.onClick.AddListener(OnEquipButtonClicked);

            // Set button text and visibility based on package
            var buttonText = equipButton.GetComponentInChildren<UnityEngine.UI.Text>();
            if (buttonText == null)
            {
                var tmpText = equipButton.GetComponentInChildren<TMPro.TextMeshProUGUI>();
                if (tmpText != null)
                {
                    if (package == PKG_INVENTORY)
                    {
                        tmpText.text = "Equip";
                        equipButton.gameObject.SetActive(true);
                    }
                    else if (package == PKG_EQUIPMENT)
                    {
                        tmpText.text = "UnEquip";
                        equipButton.gameObject.SetActive(true);
                    }
                    else
                    {
                        equipButton.gameObject.SetActive(false);
                    }
                }
            }
            else
            {
                if (package == PKG_INVENTORY)
                {
                    buttonText.text = "Equip";
                    equipButton.gameObject.SetActive(true);
                }
                else if (package == PKG_EQUIPMENT)
                {
                    buttonText.text = "UnEquip";
                    equipButton.gameObject.SetActive(true);
                }
                else
                {
                    equipButton.gameObject.SetActive(false);
                }
            }
        }

        private void SetupDropButton(byte package, InventoryItemData item)
        {
            if (dropButton == null) return;

            // Clear previous listeners
            dropButton.onClick.RemoveAllListeners();
            dropButton.onClick.AddListener(OnDropButtonClicked);

            // Set button text and visibility based on package
            var buttonText = dropButton.GetComponentInChildren<UnityEngine.UI.Text>();
            if (buttonText == null)
            {
                var tmpText = dropButton.GetComponentInChildren<TMPro.TextMeshProUGUI>();
                if (tmpText != null)
                {
                    if (package == PKG_INVENTORY || package == PKG_EQUIPMENT)
                    {
                        tmpText.text = "Drop";
                        dropButton.gameObject.SetActive(true);
                    }
                    else
                    {
                        dropButton.gameObject.SetActive(false);
                    }
                }
            }
            else
            {
                if (package == PKG_INVENTORY || package == PKG_EQUIPMENT)
                {
                    buttonText.text = "Drop";
                    dropButton.gameObject.SetActive(true);
                }
                else
                {
                    dropButton.gameObject.SetActive(false);
                }
            }
        }

        private static string GetPackageName(byte pkg)
        {
            switch (pkg)
            {
                case 0: return "PACK_INVENTORY";
                case 1: return "PACK_EQUIPMENT";
                case 3: return "PACK_FASHION";
                default: return $"PACK_{pkg}";
            }
        }
    }
}