type Client interface {
	ByID(id int) (Doujinshi, error)
	Random() (Doujinshi, error)

	Search(q string, page int) ([]Doujinshi, error)
	SearchByTag(tag Tag, page int) ([]Doujinshi, error)
	Related(id int) ([]Doujinshi, error)
}

type Cover = Image

type Doujinshi struct {
	// ID is unique identification number of Doujinshi.
	// Note: parser does not parse ID of Doujinshi.
	ID        int    `json:"id"`
	MediaID   int    `json:"media_id"`
	Title     Title  `json:"title"`
	Tags      []Tag  `json:"tags"`
	Scanlator string `json:"scanlator"`
	// NumPages is number of manga pages.
	NumPages     int       `json:"num_pages"`
	NumFavorites int       `json:"num_favorites"`
	UploadDate   time.Time `json:"upload_date"`
	Images       Images    `json:"images"`
}

type Downloader interface {
	Page(mediaID, n int) (io.ReadCloser, error)
	Thumbnail(mediaID int, n int) (io.ReadCloser, error)
	Cover(mediaID int) (io.ReadCloser, error)
}

type Image struct {
	T      string `json:"t"`
	Width  int    `json:"w"`
	Height int    `json:"h"`
}

type Images struct {
	Pages     []Page    `json:"pages"`
	Cover     Cover     `json:"cover"`
	Thumbnail Thumbnail `json:"thumbnail"`
}

type JSONTimestamp struct {
	time.Time
}

type Page = Image

type Tag struct {
	ID    int    `json:"id"`
	Type  string `json:"type"`
	Name  string `json:"name"`
	URL   string `json:"url"`
	Count int    `json:"count"`
}

type Thumbnail = Image

type Title struct {
	English  string `json:"english"`
	Japanese string `json:"japanese"`
	Pretty   string `json:"pretty"`
}