package fallbackFaces

import "golang.org/x/image/font"
import "git.tebibyte.media/tomo/tomo"
import "golang.org/x/image/font/basicfont"
import "git.tebibyte.media/tomo/backend/style"

type faceSet struct {
	regular    font.Face
	bold       font.Face
	italic     font.Face
	boldItalic font.Face
}

// New creates a new fallback face set.
func New () style.FaceSet {
	// TODO maybe pre-generate different variations of this face
	return &faceSet {
		regular:    basicfont.Face7x13,
		bold:       basicfont.Face7x13,
		italic:     basicfont.Face7x13,
		boldItalic: basicfont.Face7x13,
	}
}

func (this *faceSet) Face (face tomo.Face) font.Face {
	bold   := face.Weight >= 500
	italic := face.Italic >= 0.1 || face.Slant >= 0.1
	switch {
	case bold && italic: return this.boldItalic
	case bold:           return this.bold
	case italic:         return this.italic
	default:             return this.regular
	}
}