using System;
using System.Collections.Generic;
using System.IO;
using NightclubArcadia.Skills;
using TMPro;
using UnityEditor;
using UnityEditor.Callbacks;
using UnityEditor.SceneManagement;
using UnityEngine;
using UnityEngine.UI;
using Yarn.Unity;

/// <summary>
/// Regenerates SkillDefinition assets + SkillDatabase from the Skill Bible JSON mirror.
///
/// Source of truth for prose/roster: the Obsidian Skill System Draft.md.
/// Checked-in machine mirror: Assets/Skills/skill_bible.json (edit that, not the .assets).
/// Hand-edits to Definitions/*.asset are overwritten on script reload by EnsureSkillAssetsOnly.
/// </summary>
public static class SkillSystemSetup
{
    const string DefinitionsFolder = "Assets/Skills/Definitions";
    const string SkillsFolder = "Assets/Skills";
    const string BiblePath = "Assets/Skills/skill_bible.json";
    const string DatabasePath = "Assets/Skills/SkillDatabase.asset";
    const string ScenePath = "Assets/Scenes/DialogueTest.unity";
    const string AutoSetupSessionKey = "NightclubArcadia.SkillSystem.AutoSetupDone";

    [DidReloadScripts]
    static void AutoSetupAfterReload()
    {
        if (EditorApplication.isPlayingOrWillChangePlaymode)
        {
            return;
        }

        if (SessionState.GetBool(AutoSetupSessionKey, false))
        {
            return;
        }

        // Defer one frame so AssetDatabase is fully ready after domain reload.
        EditorApplication.delayCall += () =>
        {
            if (SessionState.GetBool(AutoSetupSessionKey, false))
            {
                return;
            }

            SessionState.SetBool(AutoSetupSessionKey, true);
            EnsureSkillAssetsOnly();
        };
    }

    /// <summary>
    /// Creates/updates ScriptableObject assets without opening a scene.
    /// Safe to run on domain reload. Scene wiring stays on the menu item /
    /// the checked-in DialogueTest.unity Skill System objects.
    /// </summary>
    static void EnsureSkillAssetsOnly()
    {
        if (!TryLoadRoster(out var roster))
        {
            return;
        }

        EnsureFolder("Assets", "Skills");
        EnsureFolder("Assets/Skills", "Definitions");

        var definitions = new List<SkillDefinition>();
        var rosterIds = new HashSet<string>(StringComparer.Ordinal);
        foreach (var entry in roster)
        {
            rosterIds.Add(entry.id);
            definitions.Add(CreateOrUpdateDefinition(entry));
        }

        DeleteOrphanDefinitions(rosterIds);

        var database = AssetDatabase.LoadAssetAtPath<SkillDatabase>(DatabasePath);
        if (database == null)
        {
            database = ScriptableObject.CreateInstance<SkillDatabase>();
            AssetDatabase.CreateAsset(database, DatabasePath);
        }

        database.EditorSetSkills(definitions);
        EditorUtility.SetDirty(database);
        AssetDatabase.SaveAssets();
        Debug.Log($"[SkillSystemSetup] Skill assets ready at {DatabasePath}. Run Tools/Nightclub Arcadia/Set Up Skill System if scene refs need rewiring.");
    }

    [MenuItem("Tools/Nightclub Arcadia/Set Up Skill System")]
    public static void SetUpSkillSystem()
    {
        if (!TryLoadRoster(out var roster))
        {
            return;
        }

        EnsureFolder("Assets", "Skills");
        EnsureFolder("Assets/Skills", "Definitions");

        var definitions = new List<SkillDefinition>();
        var rosterIds = new HashSet<string>(StringComparer.Ordinal);
        foreach (var entry in roster)
        {
            rosterIds.Add(entry.id);
            definitions.Add(CreateOrUpdateDefinition(entry));
        }

        DeleteOrphanDefinitions(rosterIds);

        var database = AssetDatabase.LoadAssetAtPath<SkillDatabase>(DatabasePath);
        if (database == null)
        {
            database = ScriptableObject.CreateInstance<SkillDatabase>();
            AssetDatabase.CreateAsset(database, DatabasePath);
        }

        database.EditorSetSkills(definitions);
        EditorUtility.SetDirty(database);
        AssetDatabase.SaveAssets();

        WireDialogueTestScene(database);
        AssetDatabase.SaveAssets();
        Debug.Log($"Skill system setup complete. Database at {DatabasePath}; scene wired at {ScenePath}.");
    }

    static bool TryLoadRoster(out SkillBibleEntry[] roster)
    {
        roster = null;
        var text = AssetDatabase.LoadAssetAtPath<TextAsset>(BiblePath);
        if (text == null)
        {
            Debug.LogError($"[SkillSystemSetup] Missing bible at {BiblePath}.");
            return false;
        }

        SkillBibleRoot root;
        try
        {
            root = JsonUtility.FromJson<SkillBibleRoot>(text.text);
        }
        catch (Exception ex)
        {
            Debug.LogError($"[SkillSystemSetup] Failed to parse {BiblePath}: {ex.Message}");
            return false;
        }

        if (root?.skills == null || root.skills.Length == 0)
        {
            Debug.LogError($"[SkillSystemSetup] {BiblePath} has no skills.");
            return false;
        }

        foreach (var entry in root.skills)
        {
            if (entry == null || string.IsNullOrEmpty(entry.id))
            {
                Debug.LogError($"[SkillSystemSetup] {BiblePath} contains a skill with empty id.");
                return false;
            }

            // Fail loudly on enum typos — silent defaults are content bugs.
            if (!Enum.TryParse<SkillAxis>(entry.axis, ignoreCase: true, out _))
            {
                Debug.LogError($"[SkillSystemSetup] Skill '{entry.id}': invalid axis '{entry.axis}'.");
                return false;
            }

            if (!Enum.TryParse<TraceChannel>(entry.primaryChannel, ignoreCase: true, out _))
            {
                Debug.LogError($"[SkillSystemSetup] Skill '{entry.id}': invalid primaryChannel '{entry.primaryChannel}'.");
                return false;
            }

            var secondary = string.IsNullOrEmpty(entry.secondaryChannel) ? "None" : entry.secondaryChannel;
            if (!Enum.TryParse<TraceChannel>(secondary, ignoreCase: true, out _))
            {
                Debug.LogError($"[SkillSystemSetup] Skill '{entry.id}': invalid secondaryChannel '{entry.secondaryChannel}'.");
                return false;
            }

            if (!Enum.TryParse<ClueYield>(entry.clueYield, ignoreCase: true, out _))
            {
                Debug.LogError($"[SkillSystemSetup] Skill '{entry.id}': invalid clueYield '{entry.clueYield}'.");
                return false;
            }
        }

        roster = root.skills;
        return true;
    }

    static SkillDefinition CreateOrUpdateDefinition(SkillBibleEntry entry)
    {
        var path = $"{DefinitionsFolder}/{entry.id}.asset";
        var asset = AssetDatabase.LoadAssetAtPath<SkillDefinition>(path);
        if (asset == null)
        {
            asset = ScriptableObject.CreateInstance<SkillDefinition>();
            AssetDatabase.CreateAsset(asset, path);
        }

        asset.EditorSet(entry);
        EditorUtility.SetDirty(asset);
        return asset;
    }

    static void DeleteOrphanDefinitions(HashSet<string> rosterIds)
    {
        if (!AssetDatabase.IsValidFolder(DefinitionsFolder))
        {
            return;
        }

        var guids = AssetDatabase.FindAssets("t:SkillDefinition", new[] { DefinitionsFolder });
        foreach (var guid in guids)
        {
            var path = AssetDatabase.GUIDToAssetPath(guid);
            var fileName = Path.GetFileNameWithoutExtension(path);
            if (rosterIds.Contains(fileName))
            {
                continue;
            }

            Debug.Log($"[SkillSystemSetup] Deleting orphan definition {path}");
            AssetDatabase.DeleteAsset(path);
        }
    }

    static void WireDialogueTestScene(SkillDatabase database)
    {
        if (!File.Exists(ScenePath))
        {
            Debug.LogError($"Scene not found at {ScenePath}. Run Tools/Nightclub Arcadia/Set Up Yarn Dialogue Test first.");
            return;
        }

        var scene = EditorSceneManager.OpenScene(ScenePath, OpenSceneMode.Single);

        var runner = UnityEngine.Object.FindAnyObjectByType<DialogueRunner>();
        if (runner == null)
        {
            Debug.LogError("No DialogueRunner in DialogueTest.unity.");
            return;
        }

        var skillGo = GameObject.Find("Skill System");
        if (skillGo == null)
        {
            skillGo = new GameObject("Skill System");
        }

        var runtime = skillGo.GetComponent<SkillRuntime>() ?? skillGo.AddComponent<SkillRuntime>();
        var commentary = skillGo.GetComponent<CommentarySystem>() ?? skillGo.AddComponent<CommentarySystem>();
        var idle = skillGo.GetComponent<CommentaryIdleTimer>() ?? skillGo.AddComponent<CommentaryIdleTimer>();

        var banner = EnsureBanner(runner.transform);
        var view = banner.GetComponent<SkillCheckResultView>() ?? banner.AddComponent<SkillCheckResultView>();

        var runtimeSo = new SerializedObject(runtime);
        runtimeSo.FindProperty("database").objectReferenceValue = database;
        runtimeSo.FindProperty("dialogueRunner").objectReferenceValue = runner;
        runtimeSo.FindProperty("resultView").objectReferenceValue = view;
        runtimeSo.FindProperty("commentary").objectReferenceValue = commentary;
        runtimeSo.FindProperty("debugContextId").stringValue = "Entrance_Queue";
        runtimeSo.ApplyModifiedPropertiesWithoutUndo();

        var commentarySo = new SerializedObject(commentary);
        commentarySo.FindProperty("dialogueRunner").objectReferenceValue = runner;
        commentarySo.FindProperty("database").objectReferenceValue = database;
        commentarySo.ApplyModifiedPropertiesWithoutUndo();

        var idleSo = new SerializedObject(idle);
        idleSo.FindProperty("dialogueRunner").objectReferenceValue = runner;
        idleSo.FindProperty("contextId").stringValue = "Entrance_Queue";
        idleSo.ApplyModifiedPropertiesWithoutUndo();

        var group = banner.GetComponent<CanvasGroup>();
        var label = banner.GetComponentInChildren<TMP_Text>(true);
        var viewSo = new SerializedObject(view);
        viewSo.FindProperty("group").objectReferenceValue = group;
        viewSo.FindProperty("label").objectReferenceValue = label;
        viewSo.ApplyModifiedPropertiesWithoutUndo();

        EditorSceneManager.MarkSceneDirty(scene);
        EditorSceneManager.SaveScene(scene);
    }

    static GameObject EnsureBanner(Transform dialogueRoot)
    {
        var canvas = dialogueRoot.GetComponentInChildren<Canvas>(true);
        if (canvas == null)
        {
            var canvasGo = new GameObject("Skill Check Canvas", typeof(Canvas), typeof(CanvasScaler), typeof(GraphicRaycaster));
            canvas = canvasGo.GetComponent<Canvas>();
            canvas.renderMode = RenderMode.ScreenSpaceOverlay;
            canvasGo.transform.SetParent(dialogueRoot, false);
        }

        var existing = canvas.transform.Find("Skill Check Banner");
        if (existing != null)
        {
            return existing.gameObject;
        }

        var banner = new GameObject("Skill Check Banner", typeof(RectTransform), typeof(CanvasGroup), typeof(Image));
        banner.transform.SetParent(canvas.transform, false);

        var rt = banner.GetComponent<RectTransform>();
        rt.anchorMin = new Vector2(0.1f, 0.82f);
        rt.anchorMax = new Vector2(0.9f, 0.95f);
        rt.offsetMin = Vector2.zero;
        rt.offsetMax = Vector2.zero;

        var image = banner.GetComponent<Image>();
        image.color = new Color(0f, 0f, 0f, 0.75f);

        var group = banner.GetComponent<CanvasGroup>();
        group.alpha = 0f;
        group.blocksRaycasts = false;
        group.interactable = false;

        var labelGo = new GameObject("Label", typeof(RectTransform));
        labelGo.transform.SetParent(banner.transform, false);
        var labelRt = labelGo.GetComponent<RectTransform>();
        labelRt.anchorMin = Vector2.zero;
        labelRt.anchorMax = Vector2.one;
        labelRt.offsetMin = new Vector2(16f, 8f);
        labelRt.offsetMax = new Vector2(-16f, -8f);

        var tmp = labelGo.AddComponent<TextMeshProUGUI>();
        tmp.text = string.Empty;
        tmp.alignment = TextAlignmentOptions.Center;
        tmp.fontSize = 28f;
        tmp.textWrappingMode = TextWrappingModes.Normal;
        tmp.color = Color.white;

        return banner;
    }

    static void EnsureFolder(string parent, string child)
    {
        var path = $"{parent}/{child}";
        if (!AssetDatabase.IsValidFolder(path))
        {
            AssetDatabase.CreateFolder(parent, child);
        }
    }
}