package data

import (
	"context"
	"errors"

	"emtlabs.com/spotify-sync/api"
	log "github.com/sirupsen/logrus"
	clientv3 "go.etcd.io/etcd/client/v3"
	"gopkg.in/yaml.v3"
)

const speaker_base_key string = "/v1/speaker"
const default_speaker_lease_time int64 = 10

var slog *log.Entry

func initSpeaker() error {
	slog = dlog.WithField("data", "speaker")
	return nil
}

// buildSpeakerKey returns the key for a given speaker by id
func buildSpeakerKey(id string) string {
	return speaker_base_key + "/" + id
}

// GetSpeaker returns a speaker by id
func GetSpeaker(id string) (*api.Speaker, error) {
	//set log
	l := slog.WithField("method", "get")
	l.Debugln("getting current speaker state from db")
	ctx := context.Background()
	sk := buildSpeakerKey(id)
	resp, err := Client.Get(ctx, sk)
	if err != nil {
		l.Errorln(err)
		return nil, err
	}
	if resp.Count == 0 {
		l.Warningln("speaker not available")
		return nil, err
	} else if resp.Count > 1 {
		err = errors.New("multiple speaker available on same path")
		l.Errorln(err)
		return nil, err
	}
	//decode playout
	speaker := api.Speaker{}
	resp_raw := resp.Kvs[0].Value

	err = yaml.Unmarshal(resp_raw, &speaker)
	if err != nil {
		l.Errorln(err)
		return nil, err
	}
	l.Debugln("speaker state in db (", speaker, ")")
	return &speaker, nil
}

// SendHeartbeat sends a speaker state to the db
func SendHeartbeat(speaker *api.Speaker) error {
	l := plog.WithField("method", "put")

	data, err := yaml.Marshal(speaker)
	if err != nil {
		l.Errorln(err)
		return err
	}
	l.Debugln("sending speaker to db", string(data))
	sk := buildSpeakerKey(speaker.Id)
	ctx := context.Background()
	lease, err := Client.Grant(ctx, default_speaker_lease_time)
	if err != nil {
		l.Errorln(err)
		return err
	}
	ctx = context.Background()
	_, err = Client.KV.Put(ctx, sk, string(data), clientv3.WithLease(lease.ID))
	if err != nil {
		l.Errorln(err)
		return err
	}
	return nil
}

// GetSpeakers returns a list of all speakers
func GetSpeakers() ([]api.Speaker, error) {
	//set log
	l := slog.WithField("method", "list")
	l.Debugln("list speaker states from db")
	ctx := context.Background()

	resp, err := Client.Get(ctx, speaker_base_key, clientv3.WithPrefix())
	if err != nil {
		l.Errorln(err)
		return nil, err
	}
	resp_list := make([]api.Speaker, 0)
	//decode speaker
	for _, v := range resp.Kvs {
		speaker := api.Speaker{}
		err = yaml.Unmarshal(v.Value, &speaker)
		if err != nil {
			l.Warnln(err)
			continue
		}
		resp_list = append(resp_list, speaker)
	}

	l.Debugln(len(resp_list), " speaker states read from db")
	return resp_list, nil
}