cmd

var App = &cli.App{
	Name:      "ellu-dl",
	Usage:     "Utility to convert Ellu reader to EPUB",
	ArgsUsage: "<url>",
	Flags: []cli.Flag{
		&cli.StringFlag{Name: "cookie", EnvVars: []string{"ELLU_COOKIE"}, Usage: "\"sid\" cookie", Required: true},
		&cli.BoolFlag{Name: "preview", Usage: "consume /reader-preview instead of /reader"},
	},
	Before: func(ctx *cli.Context) error {
		want := 1
		if ctx.Args().Len() != want {
			return fmt.Errorf("expected %d args, got %d", want, ctx.Args().Len())
		}
		return nil
	},
	Action: func(ctx *cli.Context) error {
		pUrl, err := url.Parse(ctx.Args().Get(0))
		if err != nil {
			return err
		}

		c := scrape.InitScraper(ctx.Context, &scrape.Scraper{
			Cookies: []*network.CookieParam{{
				Name:   "sid",
				Value:  ctx.String("cookie"),
				Domain: pUrl.Host,
			}},
			Timeout: 30 * time.Second,
		})

		book, err := getMetadata(c, pUrl)
		if err != nil {
			return fmt.Errorf("getting book id: %w", err)
		}

		root := pUrl.Scheme + "://" + pUrl.Host

		previewStr := ""
		if ctx.Bool("preview") {
			previewStr = "-preview"
		}
		rootURL := fmt.Sprintf("%s/reader%s?book_id=%d", root, previewStr, book.Id)

		if err = book.getChapters(c, rootURL); err != nil {
			return fmt.Errorf("getting book metadata: %w", err)
		}

		err = book.chaptersPopulate(c, rootURL)
		if err != nil {
			return fmt.Errorf("populating book chapters: %w", err)
		}

		e := epub.NewEpub(book.Title)
		e.SetIdentifier(strconv.Itoa(book.ISBN))
		e.SetAuthor(book.Author)

		err = book.filesPopulate(c, root, e)
		if err != nil {
			return fmt.Errorf("populating EPUB files: %w", err)
		}

		for _, chapter := range book.Chapters {
			_, err := e.AddSection(chapter.Content, chapter.Title, "", "")
			if err != nil {
				return fmt.Errorf("adding chapter %d to epub: %w", chapter.Id, err)
			}
		}

		err = e.Write(fmt.Sprintf("%s (%d).epub", book.Title, book.Id))
		return err
	},
}