// Copyright 2023 torque@epicyclic.dev
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

const std = @import("std");

pub const nats_c = @cImport({
    @cInclude("nats/nats.h");
});

const SimpleCallback = fn (?*anyopaque) callconv(.C) void;

pub fn SimpleCallbackThunkSignature(comptime T: type) type {
    return fn (*T) void;
}

pub fn makeSimpleCallbackThunk(
    comptime T: type,
    comptime callback: *const SimpleCallbackThunkSignature(T),
) *const SimpleCallback {
    return struct {
        fn thunk(userdata: ?*anyopaque) callconv(.C) void {
            const data: *T = if (userdata) |u| @alignCast(@ptrCast(u)) else unreachable;
            callback(data);
        }
    }.thunk;
}
