package cmd

import (
	"context"
	"time"

	"gitea.com/gitea/act_runner/client"
	"gitea.com/gitea/act_runner/config"
	"gitea.com/gitea/act_runner/engine"
	"gitea.com/gitea/act_runner/poller"
	"gitea.com/gitea/act_runner/register"
	"gitea.com/gitea/act_runner/runtime"
	pingv1 "gitea.com/gitea/proto-go/ping/v1"
	runnerv1 "gitea.com/gitea/proto-go/runner/v1"

	"github.com/bufbuild/connect-go"
	"github.com/joho/godotenv"
	log "github.com/sirupsen/logrus"
	"github.com/spf13/cobra"
	"golang.org/x/sync/errgroup"
)

func runDaemon(ctx context.Context, task *runtime.Task) func(cmd *cobra.Command, args []string) error {
	return func(cmd *cobra.Command, args []string) error {
		log.Infoln("Starting runner daemon")

		_ = godotenv.Load(task.Input.EnvFile)
		cfg, err := config.FromEnviron()
		if err != nil {
			log.WithError(err).
				Fatalln("invalid configuration")
		}

		initLogging(cfg)

		// initial http client
		cli := client.New(
			cfg.Client.Address,
			client.WithSkipVerify(cfg.Client.SkipVerify),
			client.WithGRPC(cfg.Client.GRPC),
			client.WithGRPCWeb(cfg.Client.GRPCWeb),
		)

		for {
			_, err := cli.Ping(ctx, connect.NewRequest(&pingv1.PingRequest{
				Data: cfg.Runner.Name,
			}))
			select {
			case <-ctx.Done():
				return nil
			default:
			}
			if ctx.Err() != nil {
				break
			}
			if err != nil {
				log.WithError(err).
					Errorln("cannot ping the remote server")
				// TODO: if ping failed, retry or exit
				time.Sleep(time.Second)
			} else {
				log.Infoln("successfully pinged the remote server")
				break
			}
		}

		// register new runner
		if cfg.Runner.UUID == "" {
			register := register.New(
				cli,
				&client.Filter{
					OS:     cfg.Platform.OS,
					Arch:   cfg.Platform.Arch,
					Labels: cfg.Runner.Labels,
				},
			)

			data, err := register.Register(ctx, cfg.Runner)
			if err != nil {
				return err
			}
			if data.UUID != "" {
				cfg.Runner.UUID = data.UUID
			}
		}

		// try to connect to docker daemon
		// if failed, exit with error
		if err := engine.Start(ctx); err != nil {
			log.WithError(err).Fatalln("failed to connect docker daemon engine")
		}

		var g errgroup.Group

		cli = client.New(
			cfg.Client.Address,
			client.WithSkipVerify(cfg.Client.SkipVerify),
			client.WithGRPC(cfg.Client.GRPC),
			client.WithGRPCWeb(cfg.Client.GRPCWeb),
			client.WithUUIDHeader(cfg.Runner.UUID),
		)

		runner := &runtime.Runner{
			Client:  cli,
			Machine: cfg.Runner.Name,
			Environ: cfg.Runner.Environ,
		}

		poller := poller.New(
			cli,
			runner.Run,
		)

		g.Go(func() error {
			log.WithField("capacity", cfg.Runner.Capacity).
				WithField("endpoint", cfg.Client.Address).
				WithField("os", cfg.Platform.OS).
				WithField("arch", cfg.Platform.Arch).
				Infoln("polling the remote server")

			// update runner status to idle
			log.Infoln("update runner status to idle")
			if _, err := cli.UpdateRunner(
				context.Background(),
				connect.NewRequest(&runnerv1.UpdateRunnerRequest{
					Status: runnerv1.RunnerStatus_RUNNER_STATUS_IDLE,
				}),
			); err != nil {
				return err
			}

			return poller.Poll(ctx, cfg.Runner.Capacity)
		})

		g.Go(func() error {
			<-ctx.Done()
			log.Infoln("update runner status to offline")
			_, err := cli.UpdateRunner(
				context.Background(),
				connect.NewRequest(&runnerv1.UpdateRunnerRequest{
					Status: runnerv1.RunnerStatus_RUNNER_STATUS_OFFLINE,
				}),
			)
			return err
		})

		err = g.Wait()
		if err != nil {
			log.WithError(err).
				Errorln("shutting down the server")
		}
		return err
	}
}