//go:build unix && (!darwin)
package registrar

import "os"
import "log"
import "git.tebibyte.media/tomo/tomo"
import "git.tebibyte.media/tomo/backend/x"
import "git.tebibyte.media/sashakoshka/goparse"
import "git.tebibyte.media/tomo/nasin/internal/icons/xdg"
import "git.tebibyte.media/tomo/nasin/internal/style/tss"
import "git.tebibyte.media/tomo/nasin/internal/icons/fallback"
import "git.tebibyte.media/tomo/nasin/internal/style/fallback"
import "git.tebibyte.media/tomo/nasin/internal/faces/fallback"

type Registrar struct {
	backend *x.Backend
}

func (this *Registrar) SetBackend () (tomo.Backend, error) {
	backend, err := x.New()
	if err != nil { return nil, err }
	this.backend = backend.(*x.Backend)
	tomo.SetBackend(backend)
	return backend, nil
}

func (this *Registrar) SetTheme () error {
	styleSheetName := os.Getenv("TOMO_STYLE_SHEET")
	if styleSheetName != "" {
		styl, _, err := tss.LoadFile(styleSheetName)
		if err == nil {
			this.backend.SetStyle(styl)
			return nil
		} else {
			log.Printf (
				"nasin: could not load style sheet '%s'\n%v",
				styleSheetName, parse.Format(err))
		}
	}
	
	styl, _ := fallbackStyle.New()
	this.backend.SetStyle(styl)
	return nil
}

func (this *Registrar) SetIconSet () error {
	iconSet := fallbackIcons.New()
	iconSetName := os.Getenv("TOMO_XDG_ICON_THEME")
	if iconSetName != "" {
		xdgIconSet, err := xdgIcons.FindThemeWarn(iconSetName, iconSet)
		if err == nil {
			iconSet = xdgIconSet
		} else {
			log.Printf("nasin: could not load icon theme '%s': %v", iconSetName, err)
		}
	}
	
	this.backend.SetIconSet(iconSet)
	return nil
}

func (this *Registrar) SetFaceSet () error {
	// TODO replace this with something that uses findfont, and caches and
	// refcounts the faces
	faceSet := fallbackFaces.New()
	this.backend.SetFaceSet(faceSet)
	return nil
}