using System;
using System.IO;
using System.Linq;
using System.Reflection;
using TH1_Logic.Hotfix;
using UnityEditor;
using UnityEngine;

namespace TH1_Logic.Editor.HybridCLR
{
    public static class TH1HybridCLRBuildTools
    {
        private const string HybridClrInstallerMenu = "HybridCLR/Installer...";
        private const string HybridClrGenerateAllMenu = "HybridCLR/Generate/All";
        private const string HybridClrCompileDllMenu = "HybridCLR/CompileDll/ActiveBuildTarget";

        [MenuItem("Tools/TH1/iOS Migration/HybridCLR/1. Run HybridCLR Installer")]
        public static void RunHybridClrInstaller()
        {
            ExecuteHybridClrMenu(HybridClrInstallerMenu);
        }

        [MenuItem("Tools/TH1/iOS Migration/HybridCLR/2. Configure TH1 Hotfix Settings")]
        public static void ConfigureHotfixSettings()
        {
            var settingsType = FindType("HybridCLR.Editor.Settings.HybridCLRSettings");
            if (settingsType == null)
            {
                Debug.LogWarning("[TH1.HybridCLR] HybridCLR package is not available yet. Let Unity resolve packages, then run this menu again.");
                return;
            }

            var instance = settingsType.GetProperty("Instance", BindingFlags.Public | BindingFlags.Static)?.GetValue(null);
            if (instance == null)
            {
                Debug.LogWarning("[TH1.HybridCLR] HybridCLRSettings.Instance is unavailable.");
                return;
            }

            SetBoolField(settingsType, instance, "enable", true);
            AddStringToArrayField(settingsType, instance, "hotUpdateAssemblies", HotfixManifest.HotfixAssemblyName);
            AddStringToArrayField(settingsType, instance, "patchAOTAssemblies", "mscorlib");
            AddStringToArrayField(settingsType, instance, "patchAOTAssemblies", "System");
            AddStringToArrayField(settingsType, instance, "patchAOTAssemblies", "System.Core");

            settingsType.GetMethod("Save", BindingFlags.Public | BindingFlags.Static)?.Invoke(null, null);
            Debug.Log("[TH1.HybridCLR] Configured HybridCLRSettings for TH1.Hotfix.");
        }

        [MenuItem("Tools/TH1/iOS Migration/HybridCLR/3. Generate All")]
        public static void GenerateAll()
        {
            ExecuteHybridClrMenu(HybridClrGenerateAllMenu);
        }

        [MenuItem("Tools/TH1/iOS Migration/HybridCLR/4. Compile Hotfix Dll")]
        public static void CompileHotfixDll()
        {
            if (!ExecuteHybridClrMenu(HybridClrCompileDllMenu))
            {
                Debug.LogWarning("[TH1.HybridCLR] Compile menu was not found. Run HybridCLR/Generate/All or use the package CompileDll menu manually.");
            }
        }

        [MenuItem("Tools/TH1/iOS Migration/HybridCLR/5. Copy Hotfix Artifacts To StreamingAssets")]
        public static void CopyHotfixArtifactsToStreamingAssets()
        {
            CopyHotfixDll();
            CopyAotMetadataDlls();
            AssetDatabase.Refresh();
        }

        [MenuItem("Tools/TH1/iOS Migration/HybridCLR/6. Test Load StreamingAssets Hotfix In Editor")]
        public static void TestLoadHotfixInEditor()
        {
            var loaded = HotfixBootstrap.InitializeFromStreamingAssets(true);
            Debug.Log($"[TH1.HybridCLR] Test load result: {loaded}, assembly: {HotfixBootstrap.LoadedAssemblyFullName}");
        }

        private static void CopyHotfixDll()
        {
            var buildTarget = EditorUserBuildSettings.activeBuildTarget.ToString();
            var source = Path.Combine("HybridCLRData", "HotUpdateDlls", buildTarget, HotfixManifest.HotfixAssemblyName + ".dll");
            if (!File.Exists(source))
            {
                source = Path.Combine("Library", "ScriptAssemblies", HotfixManifest.HotfixAssemblyName + ".dll");
            }

            var destination = Path.Combine(
                Application.streamingAssetsPath,
                HotfixManifest.RootFolderName,
                HotfixManifest.HotfixDllFolderName,
                HotfixManifest.HotfixAssemblyFileName);

            CopyFile(source, destination, "hotfix dll");
        }

        private static void CopyAotMetadataDlls()
        {
            var buildTarget = EditorUserBuildSettings.activeBuildTarget.ToString();
            var sourceDir = Path.Combine("HybridCLRData", "AssembliesPostIl2CppStrip", buildTarget);
            var destinationDir = Path.Combine(Application.streamingAssetsPath, HotfixManifest.RootFolderName, HotfixManifest.AotMetadataFolderName);

            if (!Directory.Exists(sourceDir))
            {
                Debug.LogWarning($"[TH1.HybridCLR] AOT metadata source missing: {sourceDir}. Run HybridCLR/Generate/All after an IL2CPP target is selected.");
                return;
            }

            Directory.CreateDirectory(destinationDir);
            foreach (var fileName in HotfixManifest.AotMetadataAssemblyFileNames)
            {
                var source = Path.Combine(sourceDir, fileName.Replace(".bytes", ""));
                var destination = Path.Combine(destinationDir, fileName);
                if (!File.Exists(source))
                {
                    Debug.LogWarning($"[TH1.HybridCLR] AOT metadata dll missing: {source}");
                    continue;
                }

                File.Copy(source, destination, true);
                Debug.Log($"[TH1.HybridCLR] Copied AOT metadata: {destination}");
            }
        }

        private static bool ExecuteHybridClrMenu(string menuPath)
        {
            if (EditorApplication.ExecuteMenuItem(menuPath))
            {
                return true;
            }

            Debug.LogWarning($"[TH1.HybridCLR] Unity menu not found: {menuPath}. Make sure the HybridCLR package has been resolved.");
            return false;
        }

        private static void CopyFile(string source, string destination, string label)
        {
            if (!File.Exists(source))
            {
                Debug.LogWarning($"[TH1.HybridCLR] {label} source missing: {source}");
                return;
            }

            Directory.CreateDirectory(Path.GetDirectoryName(destination));
            File.Copy(source, destination, true);
            Debug.Log($"[TH1.HybridCLR] Copied {label}: {destination}");
        }

        private static Type FindType(string fullName)
        {
            return AppDomain.CurrentDomain.GetAssemblies()
                .Select(assembly => assembly.GetType(fullName, false))
                .FirstOrDefault(type => type != null);
        }

        private static void SetBoolField(Type type, object instance, string fieldName, bool value)
        {
            type.GetField(fieldName, BindingFlags.Public | BindingFlags.Instance)?.SetValue(instance, value);
        }

        private static void AddStringToArrayField(Type type, object instance, string fieldName, string value)
        {
            var field = type.GetField(fieldName, BindingFlags.Public | BindingFlags.Instance);
            if (field == null) return;

            var values = ((string[])field.GetValue(instance) ?? Array.Empty<string>()).ToList();
            if (!values.Contains(value))
            {
                values.Add(value);
                field.SetValue(instance, values.ToArray());
            }
        }
    }
}