using System;
using System.Collections.Generic;
using System.Linq;
using AibisDream.Kit;
using AibisDream.SaveSystem;
using UnityEngine;

namespace AibisDream.FixSystem
{
    /// <summary>
    /// 打孔带系统入口：收藏数据、Yarn 命令、弹窗与收藏夹面板代理。
    /// </summary>
    public class PunchTapeManager : Singleton<PunchTapeManager>
    {
        public GameObject punchTapecluePrefab;

        [SerializeField] private PunchTapeCatalog punchTapeCatalog;
        public PunchTapeCatalog Catalog => punchTapeCatalog;

        [SerializeField] private PunchTapeFavoritesPanel favoritesPanel;
        public PunchTapeFavoritesPanel FavoritesPanel => favoritesPanel;
        [SerializeField] private PunchTapePrinter punchTapePrinter;
        public PunchTapePrinter PunchTapePrinter => punchTapePrinter;

        private readonly List<PunchTape> _favorites = new();

        private GameObject currentPunchTapeGO;

        /// <summary>收藏列表变更时通知 <see cref="PunchTapeFavoritesPanel"/> 等订阅方。</summary>
        public event Action OnCollectionChanged;

        public IReadOnlyList<PunchTape> GetFavorites()
        {
            return _favorites;
        }

        public PunchTapeSnapshotDto CapturePunchTapeSnapshot()
        {
            return new PunchTapeSnapshotDto
            {
                favorites = _favorites.Select(t => new PunchTape(t.DefinitionId)
                {
                    used = t.used
                }).ToList()
            };
        }

        public void ApplyPunchTapeSnapshot(PunchTapeSnapshotDto dto)
        {
            _favorites.Clear();
            if (dto?.favorites != null)
            {
                foreach (var tape in dto.favorites)
                {
                    if (!TryGetDefinition(tape, out _))
                    {
                        Debug.LogWarning(
                            $"[PunchTapeManager] 存档中的打孔带 ID '{tape?.DefinitionId ?? "<null>"}' 无法解析，已跳过。",
                            this);
                        continue;
                    }

                    if (!_favorites.Contains(tape))
                        _favorites.Add(tape);
                }
            }

            OnCollectionChanged?.Invoke();
        }

        public void AddPunchTape(PunchTape punchTape)
        {
            if (punchTape == null) return;
            if (!TryGetDefinition(punchTape, out _))
            {
                Debug.LogError($"[PunchTapeManager] 无法收藏未知打孔带 '{punchTape.DefinitionId}'。", this);
                return;
            }
            if (_favorites.Contains(punchTape))
                return;

            _favorites.Add(punchTape);
            OnCollectionChanged?.Invoke();
        }

        public void RemovePunchTape(PunchTape punchTape)
        {
            if (punchTape == null) return;
            if (!_favorites.Remove(punchTape))
                return;

            OnCollectionChanged?.Invoke();
        }

        public void OpenFavoritesPanel()
        {
            if (favoritesPanel == null)
            {
                Debug.LogWarning("[PunchTapeManager] 未指定 _favoritesPanel，无法打开收藏夹面板。", this);
                return;
            }

            favoritesPanel.OpenPanel();
        }

        public void CloseFavoritesPanel()
        {
            if (favoritesPanel == null)
            {
                Debug.LogWarning("[PunchTapeManager] 未指定 _favoritesPanel，无法关闭收藏夹面板。", this);
                return;
            }

            favoritesPanel.ClosePanel();
        }

        public bool TryGetDefinition(string definitionId, out PunchTapeDefinition definition)
        {
            definition = null;
            if (punchTapeCatalog == null)
            {
                Debug.LogError("[PunchTapeManager] 未配置 PunchTapeCatalog。", this);
                return false;
            }

            var catalogErrors = punchTapeCatalog.GetValidationErrors();
            if (catalogErrors.Count > 0)
            {
                Debug.LogError(
                    $"[PunchTapeManager] PunchTapeCatalog 配置无效：\n{string.Join("\n", catalogErrors)}",
                    this);
                return false;
            }

            if (!punchTapeCatalog.TryGetDefinition(definitionId, out definition))
            {
                Debug.LogError($"[PunchTapeManager] 未找到打孔带 ID '{definitionId}'。", this);
                definition = null;
                return false;
            }

            if (!definition.TryValidate(out var error))
            {
                Debug.LogError($"[PunchTapeManager] 打孔带 ID '{definitionId}' 无效：{error}", this);
                definition = null;
                return false;
            }

            return true;
        }

        public bool TryGetDefinition(PunchTape punchTape, out PunchTapeDefinition definition)
        {
            return TryGetDefinition(punchTape?.DefinitionId, out definition);
        }

        public void GeneratePunchTapeWindow(string definitionId, bool directlyAddToFavorites = false)
        {
            if (!TryGetDefinition(definitionId, out var definition))
                return;

            PunchTape punchTape = new PunchTape(definitionId);

            if (directlyAddToFavorites)
            {
                AddPunchTape(punchTape);
                return;
            }

            GameObject go = Instantiate(punchTapecluePrefab, favoritesPanel.transform);

            PunchTapeItem item = go.GetComponent<PunchTapeItem>();
            if (item == null)
            {
                Debug.LogError("[PunchTapeManager] 生成 Prefab 缺少 PunchTapeItem。", go);
                Destroy(go);
                return;
            }

            currentPunchTapeGO = go;
            item.Setup(punchTape, definition);
        }

        /// <summary>
        /// 将当前弹窗中的打孔带收入收藏。兼容旧 Yarn：&lt;&lt;CollectionClue ClueManager&gt;&gt; 会传入参数，仍应执行收藏。
        /// </summary>
        public void CollectPunchTapeFromWindow()
        {
            if (currentPunchTapeGO == null)
            {
                Debug.LogWarning("PunchTapeManager: 没有当前打孔带窗口，无法收藏。");
                return;
            }

            PunchTapeItem item = currentPunchTapeGO.GetComponent<PunchTapeItem>();
            if (item == null)
            {
                Debug.LogWarning("PunchTapeManager: 当前物体上缺少 PunchTapeItem。");
                return;
            }

            AddPunchTape(item.GetPunchTapeData());
            Destroy(currentPunchTapeGO.gameObject);
            currentPunchTapeGO = null;
        }
    }
}