using System;
using System.IO;
using System.Linq;
using Godot;
using NLua;

class LuaMod : IDisposable {
    private readonly Lua lua = new();

    public LuaMod(string path, string? package_path = null) {
        lua.LoadCLRPackage();
        lua.State.Encoding = System.Text.Encoding.UTF8;
        lua["package.path"] = package_path ?? Path.GetDirectoryName(path) + "/?.lua;";
        lua.RegisterFunction("print", new Action<object[]>(GD.Print).Method);
        // Action bar = () => { GD.Print("bar"); };
        // lua.RegisterFunction("bar", bar.Target, bar.Method);
        lua.DoFile(path);
    }

    public void BindFunc(ModManager mod) {
        foreach (var api in mod.GetAPIs()) {
            lua.RegisterFunction(api.Key, api.Value.Target, api.Value.Method);
        }
        foreach (var hook in mod.GetHooks()) {
            if (lua[hook.Key] is LuaFunction func) {
                mod.AddHook(hook.Key, (args) => {
                    var rets = func.Call(args).FirstOrDefault();
                    if (rets is bool b) return b;
                    return false;
                });
            }
        }
    }

    public void Dispose() {
        lua?.Dispose();
        GC.SuppressFinalize(this);
    }
}