// Package assets exposes the embedded PNG icon set under assets/icons.
// Icons are exposed as raw bytes; the UI layer wraps them with Gio's
// image decoder on demand.
package assets

import (
	"embed"
	"fmt"
	"io/fs"

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

//go:embed icons/*.png
var iconsFS embed.FS

// Icon returns the bytes of a named icon (e.g. "GoogleIcon.png"). If the
// requested icon is missing, a Debug log is emitted and (nil, error) is
// returned so the caller can fall back to a placeholder.
func Icon(name string) ([]byte, error) {
	const fn = "assets.Icon"
	data, err := iconsFS.ReadFile("icons/" + name)
	if err != nil {
		global.Log.WithField("func", fn).WithField("name", name).
			Debug("icon not found")
		return nil, fmt.Errorf("assets: icon %q: %w", name, err)
	}
	return data, nil
}

// IconNames lists every embedded icon. Useful for the "choose an icon"
// dialog in the UI.
func IconNames() []string {
	const fn = "assets.IconNames"
	entries, err := fs.ReadDir(iconsFS, "icons")
	if err != nil {
		global.Log.WithField("func", fn).WithError(err).Warn("read embedded icons")
		return nil
	}
	out := make([]string, 0, len(entries))
	for _, e := range entries {
		if !e.IsDir() {
			out = append(out, e.Name())
		}
	}
	return out
}