// Package datapoint holds the position fix type shared by the macker client
// and server.
package datapoint

import "sync"

type Tri struct {
	Lat, Long, Alt float64
}

// DataPoint is a single position fix extracted from a gpsd TPV report.
// Timestamp is Unix time in milliseconds; zero means gpsd omitted the time.
type DataPoint struct {
	Speed         *float64 // Ground speed in metres per second; nil means unavailable.
	Timestamp     uint64
	Lat, LatErr   float64
	Long, LongErr float64
	Alt, AltErr   float64
}

func (dp DataPoint) getTri() Tri {
	return Tri{
		dp.Lat,
		dp.Long,
		dp.Alt,
	}
}

type TrackBuffer struct {
	DataPoints []DataPoint
	Mtx        *sync.Mutex
}

func GenTrackBuff() TrackBuffer {

	var sm sync.Mutex

	return TrackBuffer{
		[]DataPoint{},
		&sm,
	}
}

func (tb *TrackBuffer) Add(input DataPoint) {
	tb.Mtx.Lock()
	tb.DataPoints = append(tb.DataPoints, input)
	tb.Mtx.Unlock()
}

func (tb *TrackBuffer) StartTBHandler() (chan DataPoint, *TrackBuffer) {

	inchan := make(chan DataPoint)

	go func() {
		for tmp := range inchan {
			tb.Add(tmp)
		}
	}()
	return inchan, tb
}