using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using static flecs_hub.flecs;

namespace gaemstone.Flecs;

public class FlecsException
	: Exception
{
	public FlecsException() : base() {  }
	public FlecsException(string message) : base(message) {  }
}

public class FlecsAbortException
	: FlecsException
{
	private readonly string _stackTrace = new StackTrace(2, true).ToString();
	public override string? StackTrace => _stackTrace;

	private FlecsAbortException()
		: base("Abort was called by flecs") {  }

	// TODO: This might not be ideal if we ever want to set other OS API settings.
	public unsafe static void SetupHook()
	{
		ecs_os_set_api_defaults();
		var api = ecs_os_get_api();
		api.abort_ = new FnPtr_Void { Pointer = &Abort };
		ecs_os_set_api(&api);
	}

	[UnmanagedCallersOnly]
	private static void Abort()
		=> throw new FlecsAbortException();
}