package services

import (
	"time"

	"github.com/jinzhu/gorm"
	"github.com/n1try/wakapi/models"
	gormbulk "github.com/t-tiger/gorm-bulk-insert"
)

const TableHeartbeat = "heartbeat"

type HeartbeatService struct {
	Config *models.Config
	Db     *gorm.DB
}

func (srv *HeartbeatService) Init() {}

func (srv *HeartbeatService) InsertBatch(heartbeats []*models.Heartbeat) error {
	var batch []interface{}
	for _, h := range heartbeats {
		batch = append(batch, *h)
	}

	if err := gormbulk.BulkInsert(srv.Db, batch, 3000); err != nil {
		return err
	}
	return nil
}

func (srv *HeartbeatService) GetAllWithin(from, to time.Time, user *models.User) ([]*models.Heartbeat, error) {
	var heartbeats []*models.Heartbeat
	if err := srv.Db.
		Where(&models.Heartbeat{UserID: user.ID}).
		Where("time >= ?", from).
		Where("time <= ?", to).
		Order("time asc").
		Find(&heartbeats).Error; err != nil {
		return nil, err
	}
	return heartbeats, nil
}

// Will return *models.Heartbeat object with only user_id and time fields filled
func (srv *HeartbeatService) GetFirstUserHeartbeats(userIds []string) ([]*models.Heartbeat, error) {
	var heartbeats []*models.Heartbeat
	if err := srv.Db.
		Table("heartbeats").
		Select("user_id, min(time) as time").
		Where("user_id IN (?)", userIds).
		Group("user_id").
		Scan(&heartbeats).Error; err != nil {
		return nil, err
	}
	return heartbeats, nil
}