package service

import (
	"fmt"
	"reflect"
	"sync"
	"time"

	cda "git.loafle.net/commons/di-go/annotation"
	cdr "git.loafle.net/commons/di-go/registry"
	logging "git.loafle.net/commons/logging-go"
	cuej "git.loafle.net/commons/util-go/encoding/json"
	cuts "git.loafle.net/commons/util-go/time/scheduler"
	cutss "git.loafle.net/commons/util-go/time/scheduler/storage"
	occu "git.loafle.net/overflow/commons-go/core/util"
	ocmd "git.loafle.net/overflow/commons-go/model/data"
	ocmsc "git.loafle.net/overflow/commons-go/model/sensorconfig"
	ocsp "git.loafle.net/overflow/commons-go/service/probe"

	// For annotation
	_ "git.loafle.net/overflow/commons-go/core/annotation"
)

var CollectorServiceType = reflect.TypeOf((*CollectorService)(nil))

func init() {
	cdr.RegisterType(CollectorServiceType)
}

type CollectorService struct {
	ocsp.CollectorService
	cda.TypeAnnotation `annotation:"@overflow:RPCService()"`

	ProbeService   *ProbeService   `annotation:"@Inject()"`
	CrawlerService *CrawlerService `annotation:"@Inject()"`

	scheduler   *cuts.Scheduler
	scheduleMap sync.Map
}

func (s *CollectorService) InitService() error {
	_storage := cutss.NewMemoryStorage()
	s.scheduler = cuts.New(_storage)

	return nil
}

func (s *CollectorService) StartService() error {
	if err := s.scheduler.Start(); nil != err {
		return err
	}

	return nil
}

func (s *CollectorService) StopService() {
	s.scheduler.Stop()
}

func (s *CollectorService) DestroyService() {

}

func (s *CollectorService) AddSensorConfigs(sensorConfigs []*ocmsc.SensorConfig) error {
	if nil == sensorConfigs || 0 == len(sensorConfigs) {
		return nil
	}

	for _, sensorConfig := range sensorConfigs {
		interval, err := cuej.NumberToInt(sensorConfig.Schedule.Interval)
		if nil != err {
			return fmt.Errorf("Cannot convert interval[%s] %v", sensorConfig.Schedule.Interval, err)
		}
		s.addSchedule(interval, sensorConfig)
		logging.Logger().Debugf("scheduler of config[%s] has been added", sensorConfig.SensorID)
	}

	return nil
}

func (s *CollectorService) RemoveSensorConfigs(sensorConfigs []*ocmsc.SensorConfig) error {
	if nil == sensorConfigs || 0 == len(sensorConfigs) {
		return nil
	}

	for _, sensorConfig := range sensorConfigs {
		s.removeSchedule(sensorConfig.SensorID.String())
	}

	return nil
}

func (s *CollectorService) addSchedule(interval int, sensorConfig *ocmsc.SensorConfig) {
	s.removeSchedule(sensorConfig.SensorID.String())
	scheduleID, err := s.scheduler.RunEvery(time.Duration(interval)*time.Second, s.collectTask, sensorConfig)
	if nil != err {
		logging.Logger().Errorf("Cannot add schedule for config[%s] %v", sensorConfig.SensorID, err)
		return
	}
	s.scheduleMap.Store(sensorConfig.SensorID, scheduleID)
}

func (s *CollectorService) removeSchedule(sensorID string) {
	scheduleID, ok := s.scheduleMap.Load(sensorID)
	if !ok {
		return
	}
	s.scheduleMap.Delete(sensorID)
	s.scheduler.Cancel(scheduleID.(string))
}

func (s *CollectorService) collectTask(sensorConfig *ocmsc.SensorConfig) {
	logging.Logger().Debugf("CollectorService.collectTask for sensor config id[%s] of crawler[%s]", sensorConfig.SensorID, sensorConfig.Crawler.MetaCrawlerKey)

	result, err := s.CrawlerService.Get(sensorConfig.SensorID.String())
	if nil != err {
		logging.Logger().Errorf("Cannot get data from crawler[%s] %v", sensorConfig.Crawler.MetaCrawlerKey, err)
		return
	}

	m := &ocmd.Metric{
		SensorID: sensorConfig.SensorID.String(),
		Data:           result,
		StartDate:    occu.NowPtr(),
	}

	if err := s.ProbeService.Send("MetricService.Send", m); nil != err {
		logging.Logger().Errorf("Cannot send data from config id[%s] of crawler[%s] %v", sensorConfig.SensorID, sensorConfig.Crawler.MetaCrawlerKey, err)
	}
}