package hotkey

import (
	"fmt"
	"syscall"
)

var (
	moduser32            = syscall.NewLazyDLL("user32.dll")
	procRegisterHotKey   = moduser32.NewProc("RegisterHotKey")
	procUnregisterHotKey = moduser32.NewProc("UnregisterHotKey")
	procPostMessage      = moduser32.NewProc("PostMessageW")
)

const (
	ModAlt     = 0x0001
	ModControl = 0x0002
	ModShift   = 0x0004
	ModWin     = 0x0008

	WM_HOTKEY      = 0x0312
	WM_APP_HOTKEY  = 0x8001 // 自定义消息：在主线程触发热键注册
)

func Register(hwnd uintptr, id int32, modifiers uint32, vk uint32) error {
	ret, _, _ := procRegisterHotKey.Call(hwnd, uintptr(id), uintptr(modifiers), uintptr(vk))
	if ret == 0 {
		return fmt.Errorf("RegisterHotKey failed for id=%d", id)
	}
	return nil
}

func Unregister(hwnd uintptr, id int32) bool {
	ret, _, _ := procUnregisterHotKey.Call(hwnd, uintptr(id))
	return ret != 0
}

// PostMessage 向窗口投递异步消息（用于跨线程调度到主线程）
func PostMessage(hwnd uintptr, msg uint32, wParam, lParam uintptr) {
	procPostMessage.Call(hwnd, uintptr(msg), wParam, lParam)
}