package message_server

import (
	"fmt"

	"google.golang.org/protobuf/proto"
	apiproto "joylink.club/bj-rtsts-server/grpcproto"
	"joylink.club/bj-rtsts-server/ts/protos/state"
	"joylink.club/bj-rtsts-server/ts/simulation/wayside/memory"
	"joylink.club/ecs"
)

// 世界状态变化消息服务
type SimulationStateMs struct {
	vs      *memory.VerifySimulation
	channel string
}

func NewSimulationStateMs(vs *memory.VerifySimulation) *SimulationStateMs {
	ms := &SimulationStateMs{
		vs:      vs,
		channel: fmt.Sprintf("simulation-%s-status", vs.SimulationId),
	}
	ecs.WorldStateChangeEvent.Subscribe(ms.vs.World, func(_ ecs.World, e ecs.WorldStateChange) {
		switch e.NewState {
		case ecs.WorldClose:
			doSendState(ms.channel, &state.SimulationStatus{
				SimulationId: vs.SimulationId,
				State:        state.SimulationStatus_DESTROY,
			})
		case ecs.WorldError:
			doSendState(ms.channel, &state.SimulationStatus{
				SimulationId: vs.SimulationId,
				State:        state.SimulationStatus_ERROR,
			})
		case ecs.WorldPause:
			doSendState(ms.channel, &state.SimulationStatus{
				SimulationId: vs.SimulationId,
				State:        state.SimulationStatus_PAUSE,
			})
		}
	})
	return ms
}

func doSendState(channel string, status *state.SimulationStatus) error {
	b, err := proto.Marshal(status)
	if err != nil {
		return fmt.Errorf("仿真状态消息服务数据序列化失败, %s", err)
	}
	apiproto.PublishMsg(channel, b)
	return nil
}