// TODO: move protocol to a separate package
package client

import (
	"git.netflux.io/rob/octoplex/internal/domain"
	"git.netflux.io/rob/octoplex/internal/event"
	"google.golang.org/protobuf/types/known/timestamppb"

	pb "git.netflux.io/rob/octoplex/internal/generated/grpc"
)

// EventToProto converts an event to a protobuf message.
func EventToProto(ev event.Event) *pb.Event {
	switch evt := ev.(type) {
	case event.AppStateChangedEvent:
		return buildAppStateChangeEvent(evt)
	case event.DestinationAddedEvent:
		return buildDestinationAddedEvent(evt)
	case event.AddDestinationFailedEvent:
		return buildAddDestinationFailedEvent(evt)
	case event.DestinationStreamExitedEvent:
		return buildDestinationStreamExitedEvent(evt)
	case event.StartDestinationFailedEvent:
		return buildStartDestinationFailedEvent(evt)
	case event.DestinationRemovedEvent:
		return buildDestinationRemovedEvent(evt)
	case event.RemoveDestinationFailedEvent:
		return buildRemoveDestinationFailedEvent(evt)
	case event.FatalErrorOccurredEvent:
		return buildFatalErrorOccurredEvent(evt)
	case event.OtherInstanceDetectedEvent:
		return buildOtherInstanceDetectedEvent(evt)
	case event.MediaServerStartedEvent:
		return buildMediaServerStartedEvent(evt)
	default:
		panic("unknown event type")
	}
}

// CommandToProto converts a command to a protobuf message.
func CommandToProto(command event.Command) *pb.Command {
	switch evt := command.(type) {
	case event.CommandAddDestination:
		return buildAddDestinationCommand(evt)
	case event.CommandRemoveDestination:
		return buildRemoveDestinationCommand(evt)
	case event.CommandStartDestination:
		return buildStartDestinationCommand(evt)
	case event.CommandStopDestination:
		return buildStopDestinationCommand(evt)
	case event.CommandCloseOtherInstance:
		return buildCloseOtherInstanceCommand(evt)
	case event.CommandQuit:
		return buildQuitCommand(evt)
	default:
		panic("unknown command type")
	}
}

func buildAppStateChangeEvent(evt event.AppStateChangedEvent) *pb.Event {
	return &pb.Event{
		EventType: &pb.Event_AppStateChanged{
			AppStateChanged: &pb.AppStateChangedEvent{
				AppState: &pb.AppState{
					Source: &pb.Source{
						Container:     containerToProto(evt.State.Source.Container),
						Live:          evt.State.Source.Live,
						LiveChangedAt: timestamppb.New(evt.State.Source.LiveChangedAt),
						Tracks:        evt.State.Source.Tracks,
						ExitReason:    evt.State.Source.ExitReason,
					},
					Destinations: destinationsToProto(evt.State.Destinations),
					BuildInfo: &pb.BuildInfo{
						GoVersion: evt.State.BuildInfo.GoVersion,
						Version:   evt.State.BuildInfo.Version,
						Commit:    evt.State.BuildInfo.Commit,
						Date:      evt.State.BuildInfo.Date,
					},
				},
			},
		},
	}
}

func buildDestinationAddedEvent(evt event.DestinationAddedEvent) *pb.Event {
	return &pb.Event{
		EventType: &pb.Event_DestinationAdded{
			DestinationAdded: &pb.DestinationAddedEvent{Url: evt.URL},
		},
	}
}

func buildAddDestinationFailedEvent(evt event.AddDestinationFailedEvent) *pb.Event {
	return &pb.Event{
		EventType: &pb.Event_AddDestinationFailed{
			AddDestinationFailed: &pb.AddDestinationFailedEvent{Url: evt.URL, Error: evt.Err.Error()},
		},
	}
}

func buildDestinationStreamExitedEvent(evt event.DestinationStreamExitedEvent) *pb.Event {
	return &pb.Event{
		EventType: &pb.Event_DestinationStreamExited{
			DestinationStreamExited: &pb.DestinationStreamExitedEvent{Name: evt.Name, Error: evt.Err.Error()},
		},
	}
}

func buildStartDestinationFailedEvent(evt event.StartDestinationFailedEvent) *pb.Event {
	return &pb.Event{
		EventType: &pb.Event_StartDestinationFailed{
			StartDestinationFailed: &pb.StartDestinationFailedEvent{Url: evt.URL, Message: evt.Message},
		},
	}
}

func buildDestinationRemovedEvent(evt event.DestinationRemovedEvent) *pb.Event {
	return &pb.Event{
		EventType: &pb.Event_DestinationRemoved{
			DestinationRemoved: &pb.DestinationRemovedEvent{Url: evt.URL},
		},
	}
}

func buildRemoveDestinationFailedEvent(evt event.RemoveDestinationFailedEvent) *pb.Event {
	return &pb.Event{
		EventType: &pb.Event_RemoveDestinationFailed{
			RemoveDestinationFailed: &pb.RemoveDestinationFailedEvent{Url: evt.URL, Error: evt.Err.Error()},
		},
	}
}

func buildFatalErrorOccurredEvent(evt event.FatalErrorOccurredEvent) *pb.Event {
	return &pb.Event{
		EventType: &pb.Event_FatalError{
			FatalError: &pb.FatalErrorEvent{Message: evt.Message},
		},
	}
}

func buildOtherInstanceDetectedEvent(_ event.OtherInstanceDetectedEvent) *pb.Event {
	return &pb.Event{
		EventType: &pb.Event_OtherInstanceDetected{
			OtherInstanceDetected: &pb.OtherInstanceDetectedEvent{},
		},
	}
}

func buildMediaServerStartedEvent(evt event.MediaServerStartedEvent) *pb.Event {
	return &pb.Event{
		EventType: &pb.Event_MediaServerStarted{
			MediaServerStarted: &pb.MediaServerStartedEvent{RtmpUrl: evt.RTMPURL, RtmpsUrl: evt.RTMPSURL},
		},
	}
}

func containerToProto(c domain.Container) *pb.Container {
	var errString string
	if c.Err != nil {
		errString = c.Err.Error()
	}

	var exitCode *int32
	if c.ExitCode != nil {
		code := int32(*c.ExitCode)
		exitCode = &code
	}

	return &pb.Container{
		Id:               c.ID,
		Status:           c.Status,
		HealthState:      c.HealthState,
		CpuPercent:       c.CPUPercent,
		MemoryUsageBytes: c.MemoryUsageBytes,
		RxRate:           int32(c.RxRate),
		TxRate:           int32(c.TxRate),
		RxSince:          timestamppb.New(c.RxSince),
		ImageName:        c.ImageName,
		PullStatus:       c.PullStatus,
		PullProgress:     c.PullProgress,
		PullPercent:      int32(c.PullPercent),
		RestartCount:     int32(c.RestartCount),
		ExitCode:         exitCode,
		Err:              errString,
	}
}

func destinationsToProto(inDests []domain.Destination) []*pb.Destination {
	destinations := make([]*pb.Destination, 0, len(inDests))
	for _, d := range inDests {
		destinations = append(destinations, destinationToProto(d))
	}
	return destinations
}

func destinationToProto(d domain.Destination) *pb.Destination {
	return &pb.Destination{
		Container: containerToProto(d.Container),
		Status:    destinationStatusToProto(d.Status),
		Name:      d.Name,
		Url:       d.URL,
	}
}

func destinationStatusToProto(s domain.DestinationStatus) pb.Destination_Status {
	switch s {
	case domain.DestinationStatusStarting:
		return pb.Destination_STATUS_STARTING
	case domain.DestinationStatusLive:
		return pb.Destination_STATUS_LIVE
	default:
		return pb.Destination_STATUS_OFF_AIR
	}
}

func buildAddDestinationCommand(cmd event.CommandAddDestination) *pb.Command {
	return &pb.Command{CommandType: &pb.Command_AddDestination{AddDestination: &pb.AddDestinationCommand{Url: cmd.URL}}}
}

func buildRemoveDestinationCommand(cmd event.CommandRemoveDestination) *pb.Command {
	return &pb.Command{CommandType: &pb.Command_RemoveDestination{RemoveDestination: &pb.RemoveDestinationCommand{Url: cmd.URL}}}
}

func buildStartDestinationCommand(cmd event.CommandStartDestination) *pb.Command {
	return &pb.Command{CommandType: &pb.Command_StartDestination{StartDestination: &pb.StartDestinationCommand{Url: cmd.URL}}}
}

func buildStopDestinationCommand(cmd event.CommandStopDestination) *pb.Command {
	return &pb.Command{CommandType: &pb.Command_StopDestination{StopDestination: &pb.StopDestinationCommand{Url: cmd.URL}}}
}

func buildCloseOtherInstanceCommand(event.CommandCloseOtherInstance) *pb.Command {
	return &pb.Command{CommandType: &pb.Command_CloseOtherInstances{CloseOtherInstances: &pb.CloseOtherInstancesCommand{}}}
}

func buildQuitCommand(event.CommandQuit) *pb.Command {
	return &pb.Command{CommandType: &pb.Command_Quit{Quit: &pb.QuitCommand{}}}
}