package http

import (
	"net/http"

	"github.com/gin-gonic/gin"
	"gitlink.org.cn/cloudream/common/pkgs/logger"
	"gitlink.org.cn/cloudream/common/utils/serder"
	"gitlink.org.cn/cloudream/jcs-pub/client/internal/http/types"
	cliapi "gitlink.org.cn/cloudream/jcs-pub/client/sdk/api/v1"
	"gitlink.org.cn/cloudream/jcs-pub/common/ecode"
	"gitlink.org.cn/cloudream/jcs-pub/common/pkgs/sysevent"
)

type SysEventService struct {
	*Server
}

func (s *Server) SysEvent() *SysEventService {
	return &SysEventService{s}
}

func (s *SysEventService) Watch(ctx *gin.Context) {
	log := logger.WithField("HTTP", "SysEvent.Watch")

	_, err := types.ShouldBindJSONEx[cliapi.SysEventWatch](ctx)
	if err != nil {
		log.Warnf("binding body: %s", err.Error())
		ctx.JSON(http.StatusBadRequest, types.Failed(ecode.BadArgument, "%v", err))
		return
	}

	if s.svc.EvtWatcher == nil {
		ctx.JSON(http.StatusOK, types.Failed(ecode.OperationFailed, "event watcher not configured"))
		return
	}

	ctx.Writer.Header().Set("Content-Type", "text/event-stream")
	ctx.Writer.Header().Set("Cache-Control", "no-cache")
	ctx.Writer.Header().Set("Connection", "keep-alive")

	wtchr := s.svc.EvtWatcher.AddWatcherFn(func(event sysevent.SysEvent) {
		data, err := serder.ObjectToJSONEx(event)
		if err != nil {
			log.Warnf("serializing event: %s", err.Error())
			return
		}

		ctx.SSEvent("message", string(data))
		ctx.Writer.Flush()
	})

	<-ctx.Request.Context().Done()
	s.svc.EvtWatcher.RemoveWatcher(wtchr)

	log.Debugf("event watcher stopped")
}