using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEditor;
using UnityEditor.UIElements;
using UnityEngine;
using UnityEngine.UIElements;
using BaseGames.Quest;

namespace BaseGames.Editor.Modules
{
    /// <summary>
    /// DataHub 任务模块 —— 管理 QuestSO 资产。
    /// </summary>
    public class QuestModule : IDataModule
    {
        private const string Folder = "Assets/_Game/Data/Quest";
        private const string Prefix = "Quest_";

        public string ModuleId    => "quest";
        public string DisplayName => "任务";
        public string IconName    => "d_UnityEditor.InspectorWindow";

        private SoListPane<QuestSO> _listPane;
        private DetailHeader        _header;
        private QuestSO             _selected;

        public void Initialize()
        {
            _listPane = new SoListPane<QuestSO>(
                Folder, Prefix,
                s =>
                {
                    bool hasPre = s.prerequisiteQuests != null && s.prerequisiteQuests.Length > 0;
                    return hasPre ? "有前置" : null;
                });
        }

        public void BuildListPane(VisualElement container, Action<UnityEngine.Object> onSelected)
        {
            _listPane.SelectionChanged = sel =>
            {
                _selected = sel;
                onSelected?.Invoke(sel);
            };
            container.Add(_listPane);
            _listPane.Refresh();
        }

        public void BuildDetailPane(VisualElement container, UnityEngine.Object selected)
        {
            _selected = selected as QuestSO;

            _header = new DetailHeader();
            _header.SetAsset(_selected);
            _header.RenameRequested += OnRenameRequested;
            container.Add(_header);

            if (_selected == null) return;

            container.Add(BuildInfoCard(_selected));
            container.Add(BuildObjectivesList(_selected));
            if (_selected.branches != null && _selected.branches.Length > 0)
                container.Add(BuildBranchesCard(_selected));
            container.Add(BuildActionBar(_selected));
            container.Add(SkillModule.MakeDivider());
            container.Add(new InspectorElement(_selected));
        }

        public void OnActivated() => _listPane?.Refresh();

        // ── 内部 ─────────────────────────────────────────────────────────────

        private void OnRenameRequested(string newName)
        {
            if (_selected == null) return;
            var (ok, err) = AssetOperations.Rename(_selected, newName);
            if (!ok) EditorUtility.DisplayDialog("重命名失败", err, "确定");
            else { _header.SetAsset(_selected); _listPane.Invalidate(); }
        }

        private static VisualElement BuildInfoCard(QuestSO s)
        {
            var card = SkillModule.MakeCard();
            int objCount = s.objectives != null ? s.objectives.Length : 0;

            SkillModule.AddChip(card, "ID",       string.IsNullOrEmpty(s.questId)        ? "(未设置)" : s.questId);
            SkillModule.AddChip(card, "名称 Key",  string.IsNullOrEmpty(s.displayNameKey) ? "(未设置)" : s.displayNameKey);
            if (!string.IsNullOrEmpty(s.descriptionKey))
                SkillModule.AddChip(card, "描述 Key", s.descriptionKey);
            SkillModule.AddChip(card, "目标数",    objCount.ToString());

            if (s.prerequisiteQuests != null && s.prerequisiteQuests.Length > 0)
            {
                // 显示每个前置任务的 questId，方便策划一眼看清依赖链
                var preIds = new System.Text.StringBuilder();
                foreach (var pre in s.prerequisiteQuests)
                {
                    if (pre == null) continue;
                    if (preIds.Length > 0) preIds.Append(", ");
                    preIds.Append(string.IsNullOrEmpty(pre.questId) ? pre.name : pre.questId);
                }
                if (preIds.Length > 0)
                    SkillModule.AddChip(card, "前置任务", preIds.ToString());
            }

            if (s.minAffinityToAccept > 0)
                SkillModule.AddChip(card, "好感门槛", s.minAffinityToAccept.ToString());
            if (s.canFail)
                SkillModule.AddChip(card, "可失败", "✓");
            if (s.reward != null)
                SkillModule.AddChip(card, "奖励", s.reward.name);
            return card;
        }

        private static VisualElement BuildObjectivesList(QuestSO s)
        {
            var section = new VisualElement();
            section.style.paddingLeft   = 12;
            section.style.paddingRight  = 12;
            section.style.paddingTop    = 6;
            section.style.paddingBottom = 6;

            var title = new Label("目标列表");
            title.style.fontSize     = 11;
            title.style.opacity      = 0.55f;
            title.style.marginBottom = 4;
            title.style.unityFontStyleAndWeight = FontStyle.Bold;
            section.Add(title);

            if (s.objectives == null || s.objectives.Length == 0)
            {
                var empty = new Label("（无目标）");
                empty.style.opacity  = 0.4f;
                empty.style.fontSize = 11;
                section.Add(empty);
                return section;
            }

            for (int i = 0; i < s.objectives.Length; i++)
            {
                var obj = s.objectives[i];
                if (obj == null) continue;

                var row = new VisualElement();
                row.style.flexDirection = FlexDirection.Row;
                row.style.alignItems    = Align.Center;
                row.style.marginBottom  = 3;

                // 序号
                var idx = new Label($"{i + 1}.");
                idx.style.fontSize    = 11;
                idx.style.opacity     = 0.5f;
                idx.style.marginRight = 4;
                idx.style.width       = 16;
                idx.style.flexShrink  = 0;
                row.Add(idx);

                // 类型徽章
                string badge = obj.BadgeLabel;
                var badgeLbl = new Label(badge);
                badgeLbl.style.fontSize   = 10;
                badgeLbl.style.opacity    = 0.7f;
                badgeLbl.style.marginRight = 6;
                badgeLbl.style.flexShrink  = 0;
                badgeLbl.style.unityFontStyleAndWeight = FontStyle.Bold;
                row.Add(badgeLbl);

                // ID
                string id = string.IsNullOrEmpty(obj.objectiveId) ? obj.name : obj.objectiveId;
                var idLbl = new Label(id);
                idLbl.style.fontSize = 11;
                idLbl.style.flexGrow = 1;
                row.Add(idLbl);

                // 可选标记
                if (obj.IsOptional)
                {
                    var opt = new Label("[可选]");
                    opt.style.fontSize  = 10;
                    opt.style.opacity   = 0.5f;
                    opt.style.marginLeft = 4;
                    row.Add(opt);
                }

                section.Add(row);
            }

            return section;
        }

        private static VisualElement BuildBranchesCard(QuestSO s)
        {
            var card = SkillModule.MakeCard();
            card.style.flexDirection = FlexDirection.Column;

            var title = new Label("完成后分支");
            title.style.fontSize     = 11;
            title.style.opacity      = 0.55f;
            title.style.marginBottom = 4;
            title.style.unityFontStyleAndWeight = FontStyle.Bold;
            card.Add(title);

            foreach (var branch in s.branches)
            {
                var row = new VisualElement();
                row.style.flexDirection = FlexDirection.Row;
                row.style.marginBottom  = 2;

                string condition = branch.conditionQuest != null ? branch.conditionQuest.questId : "(默认)";
                string next      = branch.nextQuest != null ? branch.nextQuest.name : "(无)";
                SkillModule.AddChip(row, "条件",   condition);
                SkillModule.AddChip(row, "后续任务", next);

                // 优先显示新 SO 引用；回退到旧字段（Obsolete）
                string seqName = branch.npcDialogueSequence != null
                    ? branch.npcDialogueSequence.name
#pragma warning disable CS0618
                    : branch.npcDialogueKey;
#pragma warning restore CS0618
                if (!string.IsNullOrEmpty(seqName))
                    SkillModule.AddChip(row, "对话序列", seqName);
                card.Add(row);
            }
            return card;
        }

        private VisualElement BuildActionBar(QuestSO s)
        {
            var bar = SkillModule.BuildStandardActionBar(
                s, Folder, Prefix,
                onCreated: c => _listPane.Refresh(c),
                onCloned:  c => _listPane.Refresh(c),
                onDeleted:   () => _listPane.Refresh(null));

            // 任务模块额外：代码常量生成
            new Button(GenerateQuestKeys) { text = "生成常量" }.AlsoAddTo(bar);

            return bar;
        }

        // ── QuestKeys.cs 常量生成器 ──────────────────────────────────────────

        private const string GeneratedFolder = "Assets/_Game/Scripts/Generated";
        private const string QuestKeysPath   = GeneratedFolder + "/QuestKeys.cs";

        private static void GenerateQuestKeys()
        {
            // 收集所有 questId
            var questIds = new SortedSet<string>(StringComparer.OrdinalIgnoreCase);
            foreach (var q in AssetOperations.FindAll<QuestSO>())
                if (!string.IsNullOrWhiteSpace(q.questId))
                    questIds.Add(q.questId.Trim());

            // 收集所有 targetNpcId（来自 TalkToNPC 目标 SO）
            var npcIds = new SortedSet<string>(StringComparer.OrdinalIgnoreCase);
            foreach (var obj in AssetOperations.FindAll<TalkToNPCObjective>())
                if (!string.IsNullOrWhiteSpace(obj.targetNpcId))
                    npcIds.Add(obj.targetNpcId.Trim());

            var sb = new StringBuilder();
            sb.AppendLine("// <auto-generated>");
            sb.AppendLine("// 由 QuestModule 工具自动生成，请勿手动编辑。");
            sb.AppendLine("// 重新生成：DataHub → 任务 → 任意任务 → 生成常量");
            sb.AppendLine("// </auto-generated>");
            sb.AppendLine("namespace BaseGames.Quest");
            sb.AppendLine("{");
            sb.AppendLine("    /// <summary>任务 ID 常量（从 QuestSO 自动生成）。</summary>");
            sb.AppendLine("    public static class QuestKeys");
            sb.AppendLine("    {");

            sb.AppendLine("        /// <summary>任务唯一 ID 常量。</summary>");
            sb.AppendLine("        public static class Quest");
            sb.AppendLine("        {");
            if (questIds.Count == 0)
                sb.AppendLine("            // （未发现任何 QuestSO）");
            foreach (var id in questIds)
                sb.AppendLine($"            public const string {ToIdentifier(id)} = \"{id}\";");
            sb.AppendLine("        }");

            sb.AppendLine();
            sb.AppendLine("        /// <summary>TalkToNPC 目标中使用的 NPC ID 常量。</summary>");
            sb.AppendLine("        public static class NpcId");
            sb.AppendLine("        {");
            if (npcIds.Count == 0)
                sb.AppendLine("            // （未发现任何 TalkToNPCObjective）");
            foreach (var id in npcIds)
                sb.AppendLine($"            public const string {ToIdentifier(id)} = \"{id}\";");
            sb.AppendLine("        }");

            sb.AppendLine("    }");
            sb.AppendLine("}");

            if (!Directory.Exists(GeneratedFolder))
                Directory.CreateDirectory(GeneratedFolder);

            File.WriteAllText(QuestKeysPath, sb.ToString(), Encoding.UTF8);
            AssetDatabase.Refresh();
            Debug.Log($"[QuestModule] QuestKeys.cs 已生成：{questIds.Count} 个任务 ID，{npcIds.Count} 个 NPC ID。");
            EditorUtility.DisplayDialog("生成成功",
                $"QuestKeys.cs 已写入 {QuestKeysPath}\n任务 ID: {questIds.Count}  NPC ID: {npcIds.Count}",
                "确定");
        }

        /// <summary>将任意字符串转换为合法的 C# 标识符（PascalCase）。C# 保留关键字加 @ 前缀。</summary>
        private static string ToIdentifier(string raw)
        {
            if (string.IsNullOrEmpty(raw)) return "_Empty";
            var parts = raw.Split('_', '-', ' ', '.', '/');
            var sb = new StringBuilder();
            foreach (var part in parts)
            {
                if (part.Length == 0) continue;
                sb.Append(char.ToUpperInvariant(part[0]));
                if (part.Length > 1) sb.Append(part.Substring(1));
            }
            string result = sb.ToString();
            if (result.Length > 0 && char.IsDigit(result[0]))
                result = "_" + result;
            if (string.IsNullOrEmpty(result)) return "_Empty";
            // C# 保留关键字加 @ 前缀，避免生成无法编译的代码
            if (s_CSharpKeywords.Contains(result))
                result = "@" + result;
            return result;
        }

        private static readonly HashSet<string> s_CSharpKeywords = new HashSet<string>(
            System.StringComparer.Ordinal)
        {
            "abstract","as","base","bool","break","byte","case","catch","char","checked",
            "class","const","continue","decimal","default","delegate","do","double","else",
            "enum","event","explicit","extern","false","finally","fixed","float","for",
            "foreach","goto","if","implicit","in","int","interface","internal","is","lock",
            "long","namespace","new","null","object","operator","out","override","params",
            "private","protected","public","readonly","ref","return","sbyte","sealed",
            "short","sizeof","stackalloc","static","string","struct","switch","this",
            "throw","true","try","typeof","uint","ulong","unchecked","unsafe","ushort",
            "using","virtual","void","volatile","while"
        };
    }
}