using System;
using System.Collections.Generic;
using TMPro;
using UnityEditor;
using UnityEngine;
using UnityEngine.InputSystem;

[CustomEditor(typeof(InputGlyph))]
[CanEditMultipleObjects]
public sealed class InputGlyphEditor : Editor
{
    private SerializedProperty _actionSourceMode;
    private SerializedProperty _actionReference;
    private SerializedProperty _hotkeyTrigger;
    private SerializedProperty _actionName;
    private SerializedProperty _compositePartName;
    private SerializedProperty _outputMode;
    private SerializedProperty _targetImage;
    private SerializedProperty _targetText;
    private SerializedProperty _categoryEvents;

    private GUIStyle _titleStyle;
    private GUIStyle _sectionStyle;
    private GUIStyle _hintStyle;

    private void OnEnable()
    {
        _actionSourceMode = serializedObject.FindProperty("actionSourceMode");
        _actionReference = serializedObject.FindProperty("actionReference");
        _hotkeyTrigger = serializedObject.FindProperty("hotkeyTrigger");
        _actionName = serializedObject.FindProperty("actionName");
        _compositePartName = serializedObject.FindProperty("compositePartName");
        _outputMode = serializedObject.FindProperty("outputMode");
        _targetImage = serializedObject.FindProperty("targetImage");
        _targetText = serializedObject.FindProperty("targetText");
        _categoryEvents = serializedObject.FindProperty("categoryEvents");
        BuildStyles();
    }

    public override void OnInspectorGUI()
    {
        serializedObject.Update();

        DrawSourceSection();
        DrawOutputSection();
        DrawEventsSection();

        serializedObject.ApplyModifiedProperties();
    }


    private void DrawSourceSection()
    {
        InputAction resolvedAction = ResolveSelectedAction();

        EditorGUILayout.BeginVertical(_sectionStyle);
        EditorGUILayout.PropertyField(_actionSourceMode, new GUIContent("Reference Mode"));
        DrawSourceFields();
        DrawResolvedActionInfo(resolvedAction);
        DrawCompositePartField(resolvedAction);
        EditorGUILayout.EndVertical();
        EditorGUILayout.Space(6f);
    }

    private void DrawSourceFields()
    {
        InputGlyph.ActionSourceMode mode = (InputGlyph.ActionSourceMode)_actionSourceMode.enumValueIndex;
        switch (mode)
        {
            case InputGlyph.ActionSourceMode.ActionReference:
                EditorGUILayout.PropertyField(_actionReference, new GUIContent("Action Reference"));
                EditorGUILayout.LabelField("Use a direct InputActionReference.", _hintStyle);
                break;
            case InputGlyph.ActionSourceMode.HotkeyTrigger:
                EditorGUILayout.PropertyField(_hotkeyTrigger, new GUIContent("Hotkey Trigger"));
                Component component = _hotkeyTrigger.objectReferenceValue as Component;
                if (component != null && !(component is UnityEngine.UI.IHotkeyTrigger))
                {
                    EditorGUILayout.HelpBox("Hotkey Trigger must implement IHotkeyTrigger.", MessageType.Warning);
                }
                else
                {
                    EditorGUILayout.LabelField("Reads the action from an external IHotkeyTrigger component.", _hintStyle);
                }

                break;
            case InputGlyph.ActionSourceMode.ActionName:
                EditorGUILayout.PropertyField(_actionName, new GUIContent("Action Name"));
                EditorGUILayout.LabelField("Supports ActionName or MapName/ActionName.", _hintStyle);
                break;
        }
    }

    private void DrawOutputSection()
    {
        EditorGUILayout.BeginVertical(_sectionStyle);
        EditorGUILayout.PropertyField(_outputMode, new GUIContent("Render Mode"));
        DrawOutputFields();
        EditorGUILayout.EndVertical();
        EditorGUILayout.Space(6f);
    }


    private void DrawOutputFields()
    {
        InputGlyph.OutputMode mode = (InputGlyph.OutputMode)_outputMode.enumValueIndex;
        switch (mode)
        {
            case InputGlyph.OutputMode.Image:
                EditorGUILayout.PropertyField(_targetImage, new GUIContent("Target Image"));
                EditorGUILayout.LabelField("Shows the resolved sprite on a Unity UI Image.", _hintStyle);
                break;
            case InputGlyph.OutputMode.Text:
                EditorGUILayout.PropertyField(_targetText, new GUIContent("Target TMP Text"));
                EditorGUILayout.LabelField("Uses the current TMP text as a template and replaces {0}.", _hintStyle);
                TMP_Text text = _targetText.objectReferenceValue as TMP_Text;
                if (text == null)
                {
                    EditorGUILayout.HelpBox("If TMP_Text is empty, the component tries GetComponent<TMP_Text>().", MessageType.None);
                }

                break;
        }
    }

    private void DrawEventsSection()
    {
        EditorGUILayout.BeginVertical(_sectionStyle);
        EditorGUILayout.PropertyField(_categoryEvents, new GUIContent("Category Events"), true);
        EditorGUILayout.EndVertical();
    }

    private void DrawResolvedActionInfo(InputAction action)
    {
        if (action == null)
        {
            return;
        }

        string mapName = action.actionMap != null ? action.actionMap.name : "<No Map>";
        EditorGUILayout.LabelField($"Resolved Action: {mapName}/{action.name}", _hintStyle);
    }

    private void DrawCompositePartField(InputAction action)
    {
        List<string> compositeParts = CollectCompositePartNames(action);
        if (compositeParts.Count == 0)
        {
            if (!string.IsNullOrEmpty(_compositePartName.stringValue))
            {
                _compositePartName.stringValue = string.Empty;
            }

            return;
        }

        string[] options = new string[compositeParts.Count + 1];
        options[0] = "<None>";
        for (int i = 0; i < compositeParts.Count; i++)
        {
            options[i + 1] = compositeParts[i];
        }

        int selectedIndex = 0;
        for (int i = 0; i < compositeParts.Count; i++)
        {
            if (string.Equals(compositeParts[i], _compositePartName.stringValue, StringComparison.OrdinalIgnoreCase))
            {
                selectedIndex = i + 1;
                break;
            }
        }

        int newIndex = EditorGUILayout.Popup(new GUIContent("Composite Part"), selectedIndex, options);
        _compositePartName.stringValue = newIndex <= 0 ? string.Empty : compositeParts[newIndex - 1];
        EditorGUILayout.LabelField("Shown only when the resolved action contains composite bindings.", _hintStyle);
    }

    private InputAction ResolveSelectedAction()
    {
        InputGlyph.ActionSourceMode mode = (InputGlyph.ActionSourceMode)_actionSourceMode.enumValueIndex;
        switch (mode)
        {
            case InputGlyph.ActionSourceMode.ActionReference:
                InputActionReference actionReference = _actionReference.objectReferenceValue as InputActionReference;
                return actionReference != null ? actionReference.action : null;
            case InputGlyph.ActionSourceMode.HotkeyTrigger:
                Component component = _hotkeyTrigger.objectReferenceValue as Component;
                if (component is UnityEngine.UI.IHotkeyTrigger trigger && trigger.HotkeyAction != null)
                {
                    return trigger.HotkeyAction.action;
                }

                return null;
            case InputGlyph.ActionSourceMode.ActionName:
                return ResolveActionByName(_actionName.stringValue);
            default:
                return null;
        }
    }

    private InputAction ResolveActionByName(string actionName)
    {
        if (string.IsNullOrWhiteSpace(actionName))
        {
            return null;
        }

        foreach (InputActionAsset asset in EnumerateInputActionAssets())
        {
            if (asset == null)
            {
                continue;
            }

            InputAction action = asset.FindAction(actionName, false);
            if (action != null)
            {
                return action;
            }
        }

        return null;
    }

    private IEnumerable<InputActionAsset> EnumerateInputActionAssets()
    {
        HashSet<InputActionAsset> visited = new HashSet<InputActionAsset>();
        InputBindingManager[] managers = Resources.FindObjectsOfTypeAll<InputBindingManager>();
        for (int i = 0; i < managers.Length; i++)
        {
            InputActionAsset asset = managers[i] != null ? managers[i].actions : null;
            if (asset != null && visited.Add(asset))
            {
                yield return asset;
            }
        }

        string[] guids = AssetDatabase.FindAssets("t:InputActionAsset");
        for (int i = 0; i < guids.Length; i++)
        {
            string path = AssetDatabase.GUIDToAssetPath(guids[i]);
            InputActionAsset asset = AssetDatabase.LoadAssetAtPath<InputActionAsset>(path);
            if (asset != null && visited.Add(asset))
            {
                yield return asset;
            }
        }
    }

    private static List<string> CollectCompositePartNames(InputAction action)
    {
        List<string> parts = new List<string>();
        if (action == null)
        {
            return parts;
        }

        HashSet<string> uniqueParts = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
        for (int i = 0; i < action.bindings.Count; i++)
        {
            InputBinding binding = action.bindings[i];
            if (!binding.isPartOfComposite || string.IsNullOrWhiteSpace(binding.name))
            {
                continue;
            }

            if (uniqueParts.Add(binding.name))
            {
                parts.Add(binding.name);
            }
        }

        return parts;
    }

    private void BuildStyles()
    {
        if (_titleStyle == null)
        {
            _titleStyle = new GUIStyle(EditorStyles.boldLabel)
            {
                fontSize = 14
            };
        }

        if (_sectionStyle == null)
        {
            _sectionStyle = new GUIStyle(EditorStyles.helpBox)
            {
                padding = new RectOffset(12, 12, 10, 10)
            };
        }

        if (_hintStyle == null)
        {
            _hintStyle = new GUIStyle(EditorStyles.miniLabel)
            {
                wordWrap = true
            };
        }
    }
}