package cli

import (
	"context"
	"fmt"
	"io"

	"github.com/spf13/cobra"
)

// newAppsOperationsWatchCmd creates `operations watch APP --key KEY`: it
// resumes observing an existing operation through the by-key endpoint until
// it is terminal, never reissuing the mutation.
func newAppsOperationsWatchCmd() *cobra.Command {
	var key string
	var jsonOut bool
	cmd := &cobra.Command{
		Use:   "watch APP",
		Short: "Poll an app operation until it is terminal",
		Long: `Polls the by-key operation journal until the operation is terminal.

Use it to resume watching an operation from an earlier interrupted run
without reissuing the mutation. Ctrl-C stops only local polling; the
daemon-side operation keeps running and the command prints how to resume.`,
		Args: cobra.ExactArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			handle, err := resolveAppPlane()
			if err != nil {
				return err
			}
			defer handle.close()
			return runAppsOperationsWatch(cmd.Context(), handle.plane, cmd.OutOrStdout(), cmd.ErrOrStderr(), args[0], key, jsonOut)
		},
	}
	cmd.Flags().StringVar(&key, "key", "", "Request key (required)")
	cmd.Flags().BoolVar(&jsonOut, "json", false, "Output as JSON")
	_ = cmd.MarkFlagRequired("key")
	return cmd
}

func runAppsOperationsWatch(ctx context.Context, plane ControlPlane, out, errOut io.Writer, app, key string, jsonOut bool) error {
	if app == "" || key == "" {
		return fmt.Errorf("APP and --key are required")
	}
	return watchOperation(ctx, plane, app, key, nil, out, errOut, jsonOut)
}