package ui

import (
	"github.com/spf13/afero"
	"opslag.de/schobers/fs/vfs"
	"opslag.de/schobers/zntg/allg5"
)

type Fonts interface {
	Register(name, path string, size int) error
	Get(name string) *allg5.Font
	Destroy()
}

type fonts struct {
	fts map[string]*allg5.Font
	dir vfs.CopyDir
}

func newFonts(dir vfs.CopyDir) *fonts {
	return &fonts{make(map[string]*allg5.Font), dir}
}

func NewFonts(fs afero.Fs) (Fonts, error) {
	var dir, err = vfs.NewCopyDir(fs)
	if nil != err {
		return nil, err
	}
	return newFonts(dir), nil
}

func (fts *fonts) load(name, path string, size int) error {
	f, err := allg5.LoadTTFFont(path, size)
	if nil != err {
		return err
	}
	fts.fts[name] = f
	return nil
}

func (fts *fonts) loadFromBox(name, path string, size int) error {
	path, err := fts.dir.Retrieve(path)
	if nil != err {
		return err
	}
	return fts.load(name, path, size)
}

func (fts *fonts) Register(name, path string, size int) error {
	if nil != fts.dir {
		return fts.loadFromBox(name, path, size)
	}
	return fts.load(name, path, size)
}

func (fts *fonts) Get(name string) *allg5.Font {
	return fts.fts[name]
}

func (fts *fonts) Destroy() {
	for _, f := range fts.fts {
		f.Destroy()
	}
	fts.dir.Destroy()
}