package beater

import (
	"fmt"
	"time"

	"github.com/elastic/beats/libbeat/beat"
	"github.com/elastic/beats/libbeat/common"
	"github.com/elastic/beats/libbeat/logp"
	"github.com/elastic/beats/libbeat/publisher"

	"github.com/elastic/beats/heartbeat/config"
	"github.com/elastic/beats/heartbeat/monitors"
	"github.com/elastic/beats/heartbeat/scheduler"
)

type Heartbeat struct {
	done chan struct{}

	client    publisher.Client
	scheduler *scheduler.Scheduler
	manager   *MonitorManager
}

func New(b *beat.Beat, cfg *common.Config) (beat.Beater, error) {
	logp.Warn("Beta: Heartbeat is beta software")

	config := config.DefaultConfig
	if err := cfg.Unpack(&config); err != nil {
		return nil, fmt.Errorf("Error reading config file: %v", err)
	}

	limit := config.Scheduler.Limit
	locationName := config.Scheduler.Location
	if locationName == "" {
		locationName = "Local"
	}
	location, err := time.LoadLocation(locationName)
	if err != nil {
		return nil, err
	}

	client := b.Publisher.Connect()
	sched := scheduler.NewWithLocation(limit, location)
	manager, err := newMonitorManager(client, sched, monitors.Registry, config.Monitors)
	if err != nil {
		return nil, err
	}

	bt := &Heartbeat{
		done:      make(chan struct{}),
		client:    client,
		scheduler: sched,
		manager:   manager,
	}
	return bt, nil
}

func (bt *Heartbeat) Run(b *beat.Beat) error {
	logp.Info("heartbeat is running! Hit CTRL-C to stop it.")

	if err := bt.scheduler.Start(); err != nil {
		return err
	}
	defer bt.scheduler.Stop()

	<-bt.done

	logp.Info("Shutting down.")
	return nil
}

func (bt *Heartbeat) Stop() {
	bt.client.Close()
	close(bt.done)
}