using System;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityAntiModLoader.Detectors;
using UnityAntiModLoader.Models;

namespace UnityAntiModLoader
{
    public static class AntiModLoader
    {
        /// <summary>
        /// Runs a comprehensive detection check across all supported mod loaders (BepInEx & MelonLoader).
        /// </summary>
        /// <param name="customGamePath">Optional custom game root path. Defaults to Application.dataPath parent directory.</param>
        /// <returns>List of positive detection results.</returns>
        public static List<ModDetectionResult> RunFullCheck(string customGamePath = null)
        {
            string rootPath = customGamePath;
            if (string.IsNullOrEmpty(rootPath))
            {
                rootPath = GetGameRootDirectory();
            }

            var detections = new List<ModDetectionResult>();

            // 1. Scan for BepInEx
            var bepinexResult = BepInExDetector.Scan(rootPath);
            if (bepinexResult.IsModLoaderDetected)
            {
                detections.Add(bepinexResult);
            }

            // 2. Scan for MelonLoader
            var melonResult = MelonLoaderDetector.Scan(rootPath);
            if (melonResult.IsModLoaderDetected)
            {
                detections.Add(melonResult);
            }

            return detections;
        }

        /// <summary>
        /// Returns true if any mod loader (BepInEx or MelonLoader) is detected.
        /// </summary>
        public static bool IsAnyModLoaderPresent()
        {
            var results = RunFullCheck();
            return results.Count > 0;
        }

        /// <summary>
        /// Resolves the root game installation directory regardless of Editor or Standalone Player runtime.
        /// </summary>
        public static string GetGameRootDirectory()
        {
            try
            {
                if (Application.isEditor)
                {
                    return Directory.GetCurrentDirectory();
                }

                // In standalone builds, Application.dataPath points to <GameName>_Data
                string dataPath = Application.dataPath;
                DirectoryInfo parentDir = Directory.GetParent(dataPath);
                return parentDir != null ? parentDir.FullName : dataPath;
            }
            catch (Exception ex)
            {
                Debug.LogWarning($"[AntiModLoader] Failed to resolve game root directory: {ex.Message}");
                return AppDomain.CurrentDomain.BaseDirectory;
            }
        }
    }
}