//go:build windows

package platform

import (
	"os"
	"path/filepath"
	"sync"

	toast "git.sr.ht/~jackmordaunt/go-toast/v2"
	"golang.org/x/sys/windows/registry"
)

const (
	// toastAppID 是稳定的内部 AppUserModelID；Windows 通知设置中的用户可见名称由
	// toastDisplayName 单独写入 DisplayName，避免为了改显示名破坏系统身份。
	toastAppID       = "net.commilitia.cdrop"
	toastDisplayName = "Commilitia Drop"
	// toastGUID 固定不变——它把通知归属到注册表里的本应用条目；更换会让既有通知
	// 失去归属。
	toastGUID = "{c4d8e2a1-6b3f-4e7a-9c2d-1f5b8a0e3d6c}"
)

var toastInit sync.Once

// InitializeNotifications registers the stable Windows notification identity
// and corrects its user-visible name. It is safe to call repeatedly.
func InitializeNotifications() {
	toastInit.Do(func() {
		data := toast.AppData{AppID: toastAppID, GUID: toastGUID}
		if exe, err := os.Executable(); err == nil {
			data.ActivationExe = exe
		}
		_ = toast.SetAppData(data)

		// go-toast v2.0.3 没有独立 DisplayName 字段，会把 AppID 写进
		// DisplayName，且已有值时不更新；在同一稳定键上显式覆盖显示名。
		appKey := filepath.Join(
			"SOFTWARE",
			"Classes",
			"AppUserModelId",
			toastAppID,
		)
		if key, err := registry.OpenKey(
			registry.CURRENT_USER,
			appKey,
			registry.SET_VALUE,
		); err == nil {
			_ = key.SetStringValue("DisplayName", toastDisplayName)
			_ = key.Close()
		}
	})
}

// Notify shows a native Windows toast. go-toast renders via the WinRT/COM path
// (PowerShell fallback when the AppID isn't registered), so it works without code
// signing — SmartScreen only gates the installer, not notifications. Best-effort:
// errors are swallowed.
func Notify(title, body string) {
	InitializeNotifications()
	n := toast.Notification{
		AppID: toastAppID,
		Title: title,
		Body:  body,
	}
	_ = n.Push()
}