using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using Vanguard.Api.Contracts;
using Vanguard.Shared.Protocol;

namespace Vanguard.UI.Overlays
{
    /// <summary>
    /// Единый горизонтальный список карт для Deck/Drop/Soul/Damage/Trigger/Hand.
    /// Порядок задаёт адаптер: первой идёт карта, лежащая сверху зоны.
    /// </summary>
    public sealed class CardListView
    {
        private readonly RectTransform _root;
        private readonly RectTransform _content;
        private readonly Text _title;
        private readonly Func<string, CardCatalogItemDto> _catalog;
        private Action<CardListEntry> _onEntry;
        private Action _onClose;

        public CardListView(
            Transform parent,
            Func<string, CardCatalogItemDto> catalog)
        {
            _catalog = catalog;

            var prefabRoot = OverlayPrefabs.Instantiate("CardListView", parent);
            if (prefabRoot != null)
            {
                _root = prefabRoot;
                _title = _root.Find("CardListPanel/Header/Title").GetComponent<Text>();
                _content = (RectTransform)_root.Find(
                    "CardListPanel/CardScroll/Viewport/Content");
                WireClose(_root.Find("CardListPanel/Header/Close").GetComponent<Button>());
                _root.gameObject.SetActive(false);
                return;
            }

            _root = UiKit.CreatePanel(parent, "CardListView", new Color(0f, 0f, 0f, 0.78f));
            var panel = UiKit.CreateCenteredCard(
                _root,
                "CardListPanel",
                new Vector2(980f, 560f),
                new Color(0.045f, 0.06f, 0.09f, 1f));
            UiKit.AddVerticalLayout(panel, 16, 10);

            var header = UiKit.CreatePanel(panel, "Header", Color.clear);
            UiKit.AddHorizontalLayout(header, 0, 10);
            UiKit.SetPreferredHeight(header, 44f);

            _title = UiKit.CreateText(
                header,
                "Title",
                "Карты",
                24,
                Color.white,
                TextAnchor.MiddleLeft);
            _title.fontStyle = FontStyle.Bold;
            UiKit.SetPreferredHeight(_title, 44f);

            var close = UiKit.CreateButton(header, "Close", "Закрыть", null, 16);
            var closeElement = UiKit.SetPreferredHeight(close, 40f, 0f);
            closeElement.preferredWidth = 120f;
            WireClose(close);

            var scroll = UiKit.CreateHorizontalScrollView(panel, "CardScroll", out _content, 10f);
            var scrollElement = scroll.gameObject.AddComponent<LayoutElement>();
            scrollElement.flexibleHeight = 1f;
            scrollElement.minHeight = 400f;

            _root.gameObject.SetActive(false);
        }

        public RectTransform Root => _root;

        private void WireClose(Button close)
        {
            if (close != null)
                close.onClick.AddListener(() => _onClose?.Invoke());
        }

        public bool IsVisible => _root.gameObject.activeSelf;

        public void Show(
            CardListRequest request,
            Action<CardListEntry> onEntry,
            Action onClose)
        {
            _onEntry = onEntry;
            _onClose = onClose;
            _title.text = request.Title;
            ClearChildren(_content);

            if (request.Entries.Count == 0)
            {
                var empty = UiKit.CreateText(
                    _content,
                    "Empty",
                    request.EmptyText,
                    17,
                    new Color(0.62f, 0.68f, 0.82f));
                UiKit.SetPreferredHeight(empty, 80f);
            }
            else
            {
                foreach (var entry in request.Entries)
                    AddTile(entry);
            }

            _root.SetAsLastSibling();
            _root.gameObject.SetActive(true);
        }

        public void Hide()
        {
            _root.gameObject.SetActive(false);
        }

        private void AddTile(CardListEntry entry)
        {
            var tile = UiKit.CreatePanel(
                _content,
                "Card_" + (entry.Card != null ? entry.Card.InstanceId.ToString() : "hidden"),
                Color.white);
            var layout = tile.gameObject.AddComponent<LayoutElement>();
            layout.preferredWidth = 126f;
            layout.preferredHeight = 178f;
            layout.flexibleWidth = 0f;

            var image = tile.GetComponent<Image>();
            image.raycastTarget = true;

            var meta = entry.Card != null
                ? _catalog?.Invoke(entry.Card.PrintingId)
                : null;

            if (entry.Hidden)
            {
                image.sprite = CardArt.Back;
                image.color = Color.white;
            }
            else
            {
                CardImageService.Apply(
                    image,
                    meta != null ? meta.ImageKey : null,
                    CardArt.ForCard(
                        meta != null ? meta.NameId : entry.Card.PrintingId,
                        meta != null ? meta.Clan : "None"));
            }

            var shade = UiKit.CreatePanel(tile, "Shade", new Color(0f, 0f, 0f, 0.76f));
            shade.anchorMin = new Vector2(0f, 0f);
            shade.anchorMax = new Vector2(1f, 0f);
            shade.pivot = new Vector2(0.5f, 0f);
            shade.anchoredPosition = Vector2.zero;
            shade.sizeDelta = new Vector2(0f, 44f);
            shade.GetComponent<Image>().raycastTarget = false;

            var name = UiKit.CreateText(
                tile,
                "Name",
                entry.Hidden
                    ? (entry.Label ?? "Закрытая карта")
                    : (meta != null ? Loc.CardName(meta) : entry.Card.PrintingId),
                12,
                Color.white,
                TextAnchor.LowerCenter);
            UiKit.MakeLiteral(name);
            var nameRect = name.rectTransform;
            nameRect.anchorMin = new Vector2(0f, 0f);
            nameRect.anchorMax = new Vector2(1f, 0f);
            nameRect.pivot = new Vector2(0.5f, 0f);
            nameRect.anchoredPosition = new Vector2(0f, 22f);
            nameRect.sizeDelta = new Vector2(-8f, 20f);
            name.horizontalOverflow = HorizontalWrapMode.Wrap;
            name.verticalOverflow = VerticalWrapMode.Truncate;
            name.raycastTarget = false;

            var stats = UiKit.CreateText(
                tile,
                "Stats",
                entry.Hidden || entry.Card == null
                    ? string.Empty
                    : "P " + entry.Card.Power + "  C " + entry.Card.Critical,
                10,
                new Color(0.78f, 0.84f, 0.95f),
                TextAnchor.LowerCenter);
            UiKit.MakeLiteral(stats);
            var statsRect = stats.rectTransform;
            statsRect.anchorMin = new Vector2(0f, 0f);
            statsRect.anchorMax = new Vector2(1f, 0f);
            statsRect.pivot = new Vector2(0.5f, 0f);
            statsRect.anchoredPosition = new Vector2(0f, 5f);
            statsRect.sizeDelta = new Vector2(-8f, 16f);
            stats.raycastTarget = false;

            var button = tile.gameObject.AddComponent<Button>();
            button.targetGraphic = image;
            button.onClick.AddListener(() => _onEntry?.Invoke(entry));
        }

        private static void ClearChildren(Transform parent)
        {
            for (var i = parent.childCount - 1; i >= 0; i--)
            {
                var child = parent.GetChild(i).gameObject;
                if (Application.isPlaying)
                    UnityEngine.Object.Destroy(child);
                else
                    UnityEngine.Object.DestroyImmediate(child);
            }
        }
    }
}