package command

import (
	"context"
	"fmt"

	"github.com/cs3org/reva/v2/pkg/events"
	"github.com/cs3org/reva/v2/pkg/events/stream"
	"github.com/oklog/run"
	"github.com/urfave/cli/v2"

	"github.com/owncloud/ocis/v2/ocis-pkg/config/configlog"
	"github.com/owncloud/ocis/v2/ocis-pkg/handlers"
	"github.com/owncloud/ocis/v2/ocis-pkg/log"
	"github.com/owncloud/ocis/v2/ocis-pkg/service/debug"
	"github.com/owncloud/ocis/v2/ocis-pkg/tracing"
	"github.com/owncloud/ocis/v2/ocis-pkg/version"
	"github.com/owncloud/ocis/v2/services/sse/pkg/config"
	"github.com/owncloud/ocis/v2/services/sse/pkg/config/parser"
	"github.com/owncloud/ocis/v2/services/sse/pkg/server/http"
)

// all events we care about
var _registeredEvents = []events.Unmarshaller{
	events.SendSSE{},
}

// Server is the entrypoint for the server command.
func Server(cfg *config.Config) *cli.Command {
	return &cli.Command{
		Name:     "server",
		Usage:    fmt.Sprintf("start the %s service without runtime (unsupervised mode)", cfg.Service.Name),
		Category: "server",
		Before: func(c *cli.Context) error {
			return configlog.ReturnFatal(parser.ParseConfig(cfg))
		},
		Action: func(c *cli.Context) error {
			var (
				gr          = run.Group{}
				ctx, cancel = func() (context.Context, context.CancelFunc) {
					if cfg.Context == nil {
						return context.WithCancel(context.Background())
					}
					return context.WithCancel(cfg.Context)
				}()
				logger = log.NewLogger(
					log.Name(cfg.Service.Name),
					log.Level(cfg.Log.Level),
					log.Pretty(cfg.Log.Pretty),
					log.Color(cfg.Log.Color),
					log.File(cfg.Log.File),
				)
			)
			defer cancel()

			tracerProvider, err := tracing.GetServiceTraceProvider(cfg.Tracing, cfg.Service.Name)
			if err != nil {
				return err
			}

			{
				natsStream, err := stream.NatsFromConfig(cfg.Service.Name, true, stream.NatsConfig(cfg.Events))
				if err != nil {
					return err
				}

				server, err := http.Server(
					http.Logger(logger),
					http.Context(ctx),
					http.Config(cfg),
					http.Consumer(natsStream),
					http.RegisteredEvents(_registeredEvents),
					http.TracerProvider(tracerProvider),
				)
				if err != nil {
					return err
				}

				gr.Add(server.Run, func(_ error) {
					cancel()
				})
			}

			{
				server := debug.NewService(
					debug.Logger(logger),
					debug.Name(cfg.Service.Name),
					debug.Version(version.GetString()),
					debug.Address(cfg.Debug.Addr),
					debug.Token(cfg.Debug.Token),
					debug.Pprof(cfg.Debug.Pprof),
					debug.Zpages(cfg.Debug.Zpages),
					debug.Health(handlers.Health),
					debug.Ready(handlers.Ready),
				)

				gr.Add(server.ListenAndServe, func(_ error) {
					_ = server.Shutdown(ctx)
					cancel()
				})
			}

			return gr.Run()
		},
	}
}