using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using UnityEditor;
using UnityEngine;
using Object = UnityEngine.Object;

namespace LLM.Editor.Analysis
{
    /// <summary>
    /// Provides access to Unity's project-wide settings assets by reflecting on their C# types.
    /// This returns the true, programmatic property names needed for modification.
    /// </summary>
    public class ProjectSettingsProvider : IContextProvider
    {
        public object GetContext(Object target, string qualifier)
        {
            if (string.IsNullOrEmpty(qualifier))
            {
                return "Error: A settings asset name (qualifier) is required (e.g., 'QualitySettings', 'TimeManager', 'GraphicsSettings').";
            }

            var assetPath = $"ProjectSettings/{qualifier}.asset";
            var settingsObjects = AssetDatabase.LoadAllAssetsAtPath(assetPath);

            if (settingsObjects == null || settingsObjects.Length == 0)
            {
                return $"Error: Could not find project settings file at '{assetPath}'. Please ensure the qualifier is a valid settings asset name.";
            }
            
            // Find the main settings object, which often matches the file name.
            var mainSettingsObject = settingsObjects.FirstOrDefault(o => o != null && o.GetType().Name == qualifier) 
                                     ?? settingsObjects.FirstOrDefault();

            if (mainSettingsObject == null)
            {
                return $"Error: No valid settings object found in '{assetPath}'.";
            }

            var settingsType = mainSettingsObject.GetType();
            var properties = settingsType.GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static);

            var settingsData = new Dictionary<string, object>();
            foreach (var prop in properties)
            {
                // Ensure the property can be read and is not an indexer property.
                if (!prop.CanRead || prop.GetIndexParameters().Length > 0) continue;
                
                try
                {
                    settingsData[prop.Name] = prop.GetValue(mainSettingsObject);
                }
                catch
                {
                    // Ignore properties that throw exceptions when read.
                }
            }

            return settingsData;
        }
    }
}