granules

var Cmd = &cobra.Command{
	Use:     "granules (--collection=COL|--nativeid=ID|--shortname=NAME) [flags]",
	Aliases: []string{"g", "gr", "gran", "granule"},
	Short:   "Search for and download collection granules",
	Long: `
Search for and download collection granules

NASA Earthdata Authentication
  Most, if not all, providers require authentication which is generally provided 
  via a netrc file, something like so:

    machine urs.earthdata.nasa.gov login <username> password <plain text password>

  NOTE: It is very important that this file is only accessible via your user. On
  Linux and OSX this can be done via 'chmod 0600 ~/.netrc'.

  For more details:

    https://wiki.earthdata.nasa.gov/display/EL/How+To+Access+Data+With+cURL+And+Wget

`,
	Example: `
  Search for all products with a collection short name prefix:

    cmrfetch granules -s "CLDMSK_*"

  Search for multiple collection short names:

    cmrfetch granules -s CLDMSK_L2_VIIRS_SNPP -s CLDMSK_L2_VIIRS_NOAA20,CLDMSK_L2_MODIS_Aqua

  Search for granules by filename:

    cmrfetch granules -c C1964798938-LAADS -f CLDMSK_L2_VIIRS_NOAA20.A2023115.0142.001.2023115140055.nc 
`,
	RunE: func(cmd *cobra.Command, args []string) error {
		flags := cmd.Flags()

		if !flags.Changed("collection") &&
			!flags.Changed("nativeid") &&
			!flags.Changed("shortname") &&
			!flags.Changed("filename") {
			return fmt.Errorf("at least one of --collection, --shortname, --nativeid, or --filename is required")
		}

		netrc, err := flags.GetBool("netrc")
		failOnError(err)
		verbose, err := flags.GetBool("verbose")
		failOnError(err)
		output, err := flags.GetString("output")
		failOnError(err)

		yes, err := flags.GetBool("yes")
		failOnError(err)
		destdir, err := flags.GetString("download")
		failOnError(err)
		concurrency, err := flags.GetInt("download-concurrency")
		failOnError(err)
		clobber, err := flags.GetBool("download-clobber")
		failOnError(err)

		fields, err := flags.GetStringSlice("fields")
		failOnError(err)
		for _, name := range fields {
			if !arrayContains(validFields, name) {
				return fmt.Errorf("%s is not a valid field name", name)
			}
		}

		if flags.Changed("filename") && !flags.Changed("collection") {
			return fmt.Errorf("--collection is required when using --filename")
		}

		params, err := newParams(flags)
		if err != nil {
			return err
		}

		var logger *log.Logger
		if verbose {
			logger = log.New(os.Stderr, "", log.LstdFlags)
		}

		api := internal.NewCMRSearchAPI(logger)

		if destdir != "" {
			err = doDownload(context.TODO(), api, params, destdir, netrc, clobber, yes, verbose, concurrency)
		} else {
			err = do(api, params, output, fields, yes)
		}
		if err != nil {
			log.Fatalf("failed! %s", err)
		}

		return nil
	},
}