package about

import (
	"context"
	"encoding/json"
	"fmt"
	"os"

	"github.com/pkg/errors"
	"github.com/rclone/rclone/cmd"
	"github.com/rclone/rclone/fs"
	"github.com/rclone/rclone/fs/config/flags"
	"github.com/spf13/cobra"
)

var (
	jsonOutput bool
	fullOutput bool
)

func init() {
	cmd.Root.AddCommand(commandDefinition)
	cmdFlags := commandDefinition.Flags()
	flags.BoolVarP(cmdFlags, &jsonOutput, "json", "", false, "Format output as JSON")
	flags.BoolVarP(cmdFlags, &fullOutput, "full", "", false, "Full numbers instead of SI units")
}

// printValue formats uv to be output
func printValue(what string, uv *int64) {
	what += ":"
	if uv == nil {
		return
	}
	var val string
	if fullOutput {
		val = fmt.Sprintf("%d", *uv)
	} else {
		val = fs.SizeSuffix(*uv).String()
	}
	fmt.Printf("%-9s%v\n", what, val)
}

var commandDefinition = &cobra.Command{
	Use:   "about remote:",
	Short: `Get quota information from the remote.`,
	Long: `
Get quota information from the remote, like bytes used/free/quota and bytes
used in the trash. Not supported by all remotes.

This will print to stdout something like this:

    Total:   17G
    Used:    7.444G
    Free:    1.315G
    Trashed: 100.000M
    Other:   8.241G

Where the fields are:

  * Total: total size available.
  * Used: total size used
  * Free: total amount this user could upload.
  * Trashed: total amount in the trash
  * Other: total amount in other storage (eg Gmail, Google Photos)
  * Objects: total number of objects in the storage

Note that not all the backends provide all the fields - they will be
missing if they are not known for that backend.  Where it is known
that the value is unlimited the value will also be omitted.

Use the --full flag to see the numbers written out in full, eg

    Total:   18253611008
    Used:    7993453766
    Free:    1411001220
    Trashed: 104857602
    Other:   8849156022

Use the --json flag for a computer readable output, eg

    {
        "total": 18253611008,
        "used": 7993453766,
        "trashed": 104857602,
        "other": 8849156022,
        "free": 1411001220
    }
`,
	Run: func(command *cobra.Command, args []string) {
		cmd.CheckArgs(1, 1, command, args)
		f := cmd.NewFsSrc(args)
		cmd.Run(false, false, command, func() error {
			doAbout := f.Features().About
			if doAbout == nil {
				return errors.Errorf("%v doesn't support about", f)
			}
			u, err := doAbout(context.Background())
			if err != nil {
				return errors.Wrap(err, "About call failed")
			}
			if u == nil {
				return errors.New("nil usage returned")
			}
			if jsonOutput {
				out := json.NewEncoder(os.Stdout)
				out.SetIndent("", "\t")
				return out.Encode(u)
			}
			printValue("Total", u.Total)
			printValue("Used", u.Used)
			printValue("Free", u.Free)
			printValue("Trashed", u.Trashed)
			printValue("Other", u.Other)
			printValue("Objects", u.Objects)
			return nil
		})
	},
}