//go:build windows

package logging

import (
	"syscall"

	"git.wxccs.org/iceking2nd/winauth-go/internal/global"
)

// AttachConsole attempts to attach the current process to the parent
// console (if any). When a GUI subsystem binary is launched from a shell,
// stdout/stderr are not visible by default; this allows --console to make
// them visible.
//
// This is a best-effort helper: any error is logged at Debug level and
// otherwise ignored. The process keeps running without a console.
func AttachConsole() {
	const fn = "internal.logging.AttachConsole"

	kernel32, err := syscall.LoadLibrary("kernel32.dll")
	if err != nil {
		global.Log.WithField("func", fn).WithError(err).Debug("LoadLibrary kernel32 failed")
		return
	}
	defer syscall.FreeLibrary(kernel32)

	attach, err := syscall.GetProcAddress(kernel32, "AttachConsole")
	if err != nil {
		global.Log.WithField("func", fn).WithError(err).Debug("GetProcAddress AttachConsole failed")
		return
	}
	alloc, err := syscall.GetProcAddress(kernel32, "AllocConsole")
	if err != nil {
		global.Log.WithField("func", fn).WithError(err).Debug("GetProcAddress AllocConsole failed")
		return
	}

	const attachParentProcess = ^uintptr(0) // -1
	r1, _, _ := syscall.SyscallN(attach, attachParentProcess)
	if r1 == 0 {
		// no parent console — allocate a new one
		r1, _, _ = syscall.SyscallN(alloc)
		if r1 == 0 {
			global.Log.WithField("func", fn).Debug("AllocConsole failed")
			return
		}
	}
	global.Log.WithField("func", fn).Debug("console attached")
}