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// Copyright 2025 Shota FUJI
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0

const std = @import("std");

const exit = @import("./exit.zig");

pub fn Callback(comptime Arg: type) type {
    if (@sizeOf(Arg) > 0) {
        return struct {
            event: std.Thread.ResetEvent,
            arg: ?Arg,

            pub fn init() @This() {
                return .{ .event = std.Thread.ResetEvent{}, .arg = null };
            }

            pub fn function(ptr: *anyopaque, arg: Arg) callconv(.C) void {
                var u: *@This() = @ptrCast(@alignCast(ptr));
                u.arg = arg;
                u.event.set();
            }

            pub fn userdata(self: *@This()) *anyopaque {
                return @ptrCast(self);
            }

            pub fn wait(self: *@This()) Arg {
                self.event.wait();
                self.event.reset();
                return self.arg orelse @panic("Callback did not set arg (" ++ @typeName(Arg) ++ ")");
            }
        };
    }

    return struct {
        event: std.Thread.ResetEvent,

        pub fn init() @This() {
            return .{ .event = std.Thread.ResetEvent{} };
        }

        pub fn function(ptr: *anyopaque) callconv(.C) void {
            var u: *@This() = @ptrCast(@alignCast(ptr));
            u.event.set();
        }

        pub fn userdata(self: *@This()) *anyopaque {
            return @ptrCast(self);
        }

        pub fn wait(self: *@This()) void {
            self.event.wait();
            self.event.reset();
        }
    };
}