using UnityEngine;
using UnityEditor;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic; // Added for HashSet
using UnityMCP.Editor.Helpers; // For Response class

namespace UnityMCP.Editor.Tools
{
    /// <summary>
    /// Handles executing Unity Editor menu items by path.
    /// </summary>
    public static class ExecuteMenuItem
    {
        // Basic blacklist to prevent accidental execution of potentially disruptive menu items.
        // This can be expanded based on needs.
        private static readonly HashSet<string> _menuPathBlacklist = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
        {
            "File/Quit",
            // Add other potentially dangerous items like "Edit/Preferences...", "File/Build Settings..." if needed
        };

        /// <summary>
        /// Main handler for executing menu items or getting available ones.
        /// </summary>
        public static object HandleCommand(JObject @params)
        {
            string action = @params["action"]?.ToString().ToLower() ?? "execute"; // Default action

            try
            {
                switch (action)
                {
                    case "execute":
                        return ExecuteItem(@params);
                    case "get_available_menus":
                        // Getting a comprehensive list of *all* menu items dynamically is very difficult
                        // and often requires complex reflection or maintaining a manual list.
                        // Returning a placeholder/acknowledgement for now.
                        Debug.LogWarning("[ExecuteMenuItem] 'get_available_menus' action is not fully implemented. Dynamically listing all menu items is complex.");
                        // Returning an empty list as per the refactor plan's requirements.
                        return Response.Success("'get_available_menus' action is not fully implemented. Returning empty list.", new List<string>());
                        // TODO: Consider implementing a basic list of common/known menu items or exploring reflection techniques if this feature becomes critical.
                    default:
                        return Response.Error($"Unknown action: '{action}'. Valid actions are 'execute', 'get_available_menus'.");
                }
            }
            catch (Exception e)
            {
                Debug.LogError($"[ExecuteMenuItem] Action '{action}' failed: {e}");
                return Response.Error($"Internal error processing action '{action}': {e.Message}");
            }
        }

        /// <summary>
        /// Executes a specific menu item.
        /// </summary>
        private static object ExecuteItem(JObject @params)
        {
            string menuPath = @params["menu_path"]?.ToString();
            // string alias = @params["alias"]?.ToString(); // TODO: Implement alias mapping based on refactor plan requirements.
            // JObject parameters = @params["parameters"] as JObject; // TODO: Investigate parameter passing (often not directly supported by ExecuteMenuItem).

            if (string.IsNullOrWhiteSpace(menuPath))
            {
                return Response.Error("Required parameter 'menu_path' is missing or empty.");
            }

            // Validate against blacklist
            if (_menuPathBlacklist.Contains(menuPath))
            {
                return Response.Error($"Execution of menu item '{menuPath}' is blocked for safety reasons.");
            }

            // TODO: Implement alias lookup here if needed (Map alias to actual menuPath).
            // if (!string.IsNullOrEmpty(alias)) { menuPath = LookupAlias(alias); if(menuPath == null) return Response.Error(...); }

            // TODO: Handle parameters ('parameters' object) if a viable method is found.
            // This is complex as EditorApplication.ExecuteMenuItem doesn't take arguments directly.
            // It might require finding the underlying EditorWindow or command if parameters are needed.

            try
            {
                // Attempt to execute the menu item on the main thread using delayCall for safety.
                EditorApplication.delayCall += () => {
                    try {
                        bool executed = EditorApplication.ExecuteMenuItem(menuPath);
                        // Log potential failure inside the delayed call.
                        if (!executed) {
                            Debug.LogError($"[ExecuteMenuItem] Failed to find or execute menu item via delayCall: '{menuPath}'. It might be invalid, disabled, or context-dependent.");
                        }
                    } catch (Exception delayEx) {
                         Debug.LogError($"[ExecuteMenuItem] Exception during delayed execution of '{menuPath}': {delayEx}");
                    }
                };

                // Report attempt immediately, as execution is delayed.
                 return Response.Success($"Attempted to execute menu item: '{menuPath}'. Check Unity logs for confirmation or errors.");
            }
            catch (Exception e)
            {
                // Catch errors during setup phase.
                Debug.LogError($"[ExecuteMenuItem] Failed to setup execution for '{menuPath}': {e}");
                return Response.Error($"Error setting up execution for menu item '{menuPath}': {e.Message}");
            }
        }

        // TODO: Add helper for alias lookup if implementing aliases.
        // private static string LookupAlias(string alias) { ... return actualMenuPath or null ... }
    }
}