#nullable enable

using System;
using System.IO;
using System.Linq;
using System.Reflection;
using ShrinkCommand;
using ShrinkEventBus;
using ShrinkModFramework.Godot;

if (args.Length != 1 || !File.Exists(args[0]))
    throw new ArgumentException("Pass the woven mod assembly path.");

using var loader = new ShrinkGodotModLoader();
var instances = loader.Load(args[0]);
if (instances.Count != 1) throw new InvalidOperationException("Mod entry was not discovered.");
var mod = instances[0];
var type = mod.GetType();
if (type.GetProperty("Ready")?.GetValue(mod) is not true)
    throw new InvalidOperationException("Mod lifecycle did not reach OnReady.");
var assembly = type.Assembly;
if (assembly.GetCustomAttributes(typeof(ShrinkCommandStaticRegistryAttribute), false).Length != 1)
    throw new InvalidOperationException("Mod command registry metadata is missing.");
var eventType = assembly.GetType("ModFixtureEvent") ?? throw new InvalidOperationException("Mod event is missing.");
var post = typeof(EventBus).GetMethods(BindingFlags.Public | BindingFlags.Static)
    .Single(method => method.Name == "Post" && method.IsGenericMethodDefinition && method.GetParameters().Length == 1)
    .MakeGenericMethod(eventType);
post.Invoke(null, new[] { Activator.CreateInstance(eventType) });
var eventSubscriber = assembly.GetType("ModFixtureEvents") ?? throw new InvalidOperationException("Mod static subscriber is missing.");
if ((int?)eventSubscriber.GetProperty("Calls", BindingFlags.Public | BindingFlags.Static)?.GetValue(null) != 1)
    throw new InvalidOperationException("Mod static EventBus binding did not run.");
if (!loader.Unload(args[0])) throw new InvalidOperationException("Mod unload failed.");
if ((int?)type.GetProperty("UnloadCalls")?.GetValue(mod) != 1)
    throw new InvalidOperationException("Mod OnUnload was not called.");
if (loader.LoadedAssemblyPaths.Count != 0)
    throw new InvalidOperationException("Mod remained registered after unload.");
Console.WriteLine("PASS external netstandard2.1 mod CodeGen + Godot AssemblyLoadContext lifecycle");