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package ride
import (
"errors"
"fmt"
"io"
"os"
"strconv"
"strings"
"time"
"github.com/jftuga/geodist"
"github.com/martinlehoux/biking_home/climb"
"github.com/martinlehoux/kagamigo/kcore"
"github.com/tkrajina/gpxgo/gpx"
)
const garminTrackPointExtensionNamespace = "http://www.garmin.com/xmlschemas/TrackPointExtension/v1"
var ErrNoTrackPoints = errors.New("ride has no track points")
type Ride struct {
climb.Route
timestamps []time.Time
heartRates []float64
cadences []float64
powers []float64
}
func (r *Ride) check() {
kcore.Assert(r.Len() > 0, "no points in ride")
kcore.Assert(len(r.Distances) == len(r.Elevations), "ride columns have different lengths")
kcore.Assert(len(r.Distances) == len(r.Coords), "ride columns have different lengths")
kcore.Assert(len(r.Distances) == len(r.timestamps), "ride columns have different lengths")
for _, column := range [][]float64{r.heartRates, r.cadences, r.powers} {
if len(column) > 0 {
kcore.Assert(len(r.Distances) == len(column), "ride columns have different lengths")
}
}
}
func (r Ride) Len() int {
return len(r.Distances)
}
func (r Ride) Timestamps() []time.Time { return r.timestamps }
func (r Ride) Powers() ([]float64, bool) { return optionalComponent(r.powers) }
func (r Ride) Cadences() ([]float64, bool) { return optionalComponent(r.cadences) }
func (r Ride) HeartRates() ([]float64, bool) { return optionalComponent(r.heartRates) }
func optionalComponent(column []float64) ([]float64, bool) {
if len(column) == 0 {
return nil, false
}
return column, true
}
type RideParser interface {
Parse(reader io.Reader) (Ride, error)
}
func ParseFile(parser RideParser, filename string) (Ride, error) {
f, err := os.Open(filename)
if err != nil {
return Ride{}, err
}
defer f.Close()
return parser.Parse(f)
}
type GPXRideParser struct{}
func (p GPXRideParser) Parse(reader io.Reader) (Ride, error) {
content, err := gpx.Parse(reader)
if err != nil {
return Ride{}, err
}
if len(content.Tracks) == 0 || len(content.Tracks[0].Segments) == 0 {
return Ride{}, ErrNoTrackPoints
}
segment := content.Tracks[0].Segments[0]
if len(segment.Points) == 0 {
return Ride{}, ErrNoTrackPoints
}
distances := make([]float64, 0, len(segment.Points))
elevations := make([]float64, 0, len(segment.Points))
coords := make([]geodist.Coord, 0, len(segment.Points))
timestamps := make([]time.Time, 0, len(segment.Points))
heartRates := make([]float64, 0, len(segment.Points))
cadences := make([]float64, 0, len(segment.Points))
powers := make([]float64, 0, len(segment.Points))
heartRateComplete := true
cadenceComplete := true
powerComplete := true
distance := 0.0
previous := segment.Points[0]
if previous.Elevation.Null() {
return Ride{}, errors.New("points without elevation")
}
distances = append(distances, 0)
elevations = append(elevations, previous.Elevation.Value())
coords = append(coords, geodist.Coord{Lat: previous.Latitude, Lon: previous.Longitude})
timestamps = append(timestamps, previous.Timestamp)
sample, err := metricSampleForPoint(previous)
if err != nil {
return Ride{}, err
}
appendMetric(&heartRates, &heartRateComplete, sample.heartRate)
appendMetric(&cadences, &cadenceComplete, sample.cadence)
appendMetric(&powers, &powerComplete, sample.power)
for i := 1; i < len(segment.Points); i++ {
p := segment.Points[i]
distance += p.Distance2D(&previous)
previous = p
if distance == 0 {
continue
}
if p.Elevation.Null() {
return Ride{}, errors.New("points without elevation")
}
distances = append(distances, distance)
elevations = append(elevations, p.Elevation.Value())
coords = append(coords, geodist.Coord{Lat: p.Latitude, Lon: p.Longitude})
timestamps = append(timestamps, p.Timestamp)
sample, err = metricSampleForPoint(p)
if err != nil {
return Ride{}, err
}
appendMetric(&heartRates, &heartRateComplete, sample.heartRate)
appendMetric(&cadences, &cadenceComplete, sample.cadence)
appendMetric(&powers, &powerComplete, sample.power)
}
if len(distances) < 2 {
return Ride{}, errors.New("zero distance")
}
var heartRatesColumn, cadencesColumn, powersColumn []float64
if heartRateComplete {
heartRatesColumn = heartRates
}
if cadenceComplete {
cadencesColumn = cadences
}
if powerComplete {
powersColumn = powers
}
return fromColumns(distances, elevations, coords, timestamps, heartRatesColumn, cadencesColumn, powersColumn), nil
}
func FromColumns(distances []float64, elevations []float64, coords []geodist.Coord, timestamps []time.Time) Ride {
return fromColumns(distances, elevations, coords, timestamps, nil, nil, nil)
}
// FromColumnsWithMetrics builds a Ride from its columns, including optional
// heart-rate, cadence and power components of the same length as the other
// columns.
func FromColumnsWithMetrics(distances []float64, elevations []float64, coords []geodist.Coord, timestamps []time.Time, heartRates, cadences, powers []float64) Ride {
return fromColumns(distances, elevations, coords, timestamps, heartRates, cadences, powers)
}
func fromColumns(distances []float64, elevations []float64, coords []geodist.Coord, timestamps []time.Time, heartRates, cadences, powers []float64) Ride {
ride := Ride{
Distances: distances,
Elevations: elevations,
Coords: coords,
timestamps: timestamps,
heartRates: heartRates,
cadences: cadences,
powers: powers,
}
ride.check()
return ride
}
type metricSample struct {
heartRate *float64
cadence *float64
power *float64
}
func metricSampleForPoint(point gpx.GPXPoint) (metricSample, error) {
heartRate, err := metricValue(point, "hr")
if err != nil {
return metricSample{}, err
}
cadence, err := metricValue(point, "cad")
if err != nil {
return metricSample{}, err
}
power, err := metricValue(point, "watts")
if err != nil {
return metricSample{}, err
}
return metricSample{heartRate: heartRate, cadence: cadence, power: power}, nil
}
func appendMetric(column *[]float64, complete *bool, value *float64) {
if value == nil {
*complete = false
*column = append(*column, 0)
return
}
*column = append(*column, *value)
}
func metricValue(point gpx.GPXPoint, name string) (*float64, error) {
trackPointExtension, found := point.Extensions.GetNode(gpx.NamespaceURL(garminTrackPointExtensionNamespace), "TrackPointExtension")
if !found {
return nil, nil
}
node, found := trackPointExtension.GetNode(name)
if !found {
return nil, nil
}
value, err := strconv.ParseFloat(strings.TrimSpace(node.Data), 64)
if err != nil {
return nil, fmt.Errorf("invalid Garmin %s value %q: %w", name, node.Data, err)
}
return &value, nil
}
func (ride Ride) Cotacol() float64 {
return climb.Cotacol(ride.Distances, ride.Elevations)
}
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