OnlineLibrary

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package localstorage
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import (
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	"encoding/xml"
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	"io/fs"
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	"os"
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	"path/filepath"
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	"OnlineLibrary/internal/config"
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	"OnlineLibrary/internal/player"
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	"gitverse.ru/kvark128/dodp"
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)
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type ContentItem struct {
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	storage   *LocalStorage
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	resources []dodp.Resource
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	metadata  *dodp.ContentMetadata
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	conf      config.Book
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}
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func NewContentItem(storage *LocalStorage, id string) *ContentItem {
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	return &ContentItem{
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		storage: storage,
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		conf:    storage.conf.LocalBooks.Book(id, player.DEFAULT_SPEED),
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	}
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}
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func (ci *ContentItem) path() string {
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	return filepath.Join(ci.storage.path, ci.conf.ID)
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}
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func (ci *ContentItem) Name() (string, error) {
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	label := ci.Label()
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	if dir, err := config.BookDir(label); err == nil && dir == ci.path() {
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		return label, nil
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	}
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	return ci.conf.ID, nil
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}
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func (ci *ContentItem) Label() string {
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	md, err := ci.ContentMetadata()
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	if err != nil {
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		return ci.conf.ID
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	}
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	return md.Metadata.Title
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}
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func (ci *ContentItem) ID() string {
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	return ci.conf.ID
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}
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func (ci *ContentItem) Resources() ([]dodp.Resource, error) {
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	if ci.resources != nil {
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		return ci.resources, nil
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	}
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	path := ci.path()
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	rsrc := make([]dodp.Resource, 0)
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	walker := func(targpath string, info fs.FileInfo, err error) error {
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		if err != nil || info.IsDir() {
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			return err
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		}
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		localURI, err := filepath.Rel(path, targpath)
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		if err != nil {
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			return err
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		}
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		r := dodp.Resource{
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			LocalURI: localURI,
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			Size:     info.Size(),
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		}
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		rsrc = append(rsrc, r)
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		return nil
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	}
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	if err := filepath.Walk(path, walker); err != nil {
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		return nil, err
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	}
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	ci.resources = rsrc
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	return ci.resources, nil
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}
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func (ci *ContentItem) ContentMetadata() (*dodp.ContentMetadata, error) {
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	if ci.metadata != nil {
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		return ci.metadata, nil
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	}
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	path := filepath.Join(ci.path(), config.MetadataFileName)
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	f, err := os.Open(path)
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	if err != nil {
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		return nil, err
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	}
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	defer f.Close()
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	md := new(dodp.ContentMetadata)
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	d := xml.NewDecoder(f)
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	if err := d.Decode(md); err != nil {
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		return nil, err
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	}
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	ci.metadata = md
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	return ci.metadata, nil
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}
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func (ci *ContentItem) Config() *config.Book {
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	return &ci.conf
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}
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func (ci *ContentItem) SaveConfig() {
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	ci.storage.conf.LocalBooks.SetBook(ci.conf)
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}
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