package cli

import (
	"net/url"
	"os"

	"github.com/powersj/whatsthis/pkg/cloud"
	"github.com/spf13/cobra"
	"golang.org/x/xerrors"

	"github.com/coder/coder/agent"
	"github.com/coder/coder/codersdk"
)

func workspaceAgent() *cobra.Command {
	return &cobra.Command{
		Use: "agent",
		// This command isn't useful for users, and seems
		// more likely to confuse.
		Hidden: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			coderURLRaw, exists := os.LookupEnv("CODER_URL")
			if !exists {
				return xerrors.New("CODER_URL must be set")
			}
			coderURL, err := url.Parse(coderURLRaw)
			if err != nil {
				return xerrors.Errorf("parse %q: %w", coderURLRaw, err)
			}
			client := codersdk.New(coderURL)
			sessionToken, exists := os.LookupEnv("CODER_TOKEN")
			if !exists {
				probe, err := cloud.New()
				if err != nil {
					return xerrors.Errorf("probe cloud: %w", err)
				}
				if !probe.Detected {
					return xerrors.Errorf("no valid authentication method found; set \"CODER_TOKEN\"")
				}
				switch {
				case probe.GCP():
					response, err := client.AuthWorkspaceGoogleInstanceIdentity(cmd.Context(), "", nil)
					if err != nil {
						return xerrors.Errorf("authenticate workspace with gcp: %w", err)
					}
					sessionToken = response.SessionToken
				default:
					return xerrors.Errorf("%q authentication not supported; set \"CODER_TOKEN\" instead", probe.Name)
				}
			}
			client.SessionToken = sessionToken
			closer := agent.New(client.ListenWorkspaceAgent, nil)
			<-cmd.Context().Done()
			return closer.Close()
		},
	}
}