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package strava
import (
"fmt"
"net/url"
"strconv"
"time"
"github.com/martinlehoux/kagamigo/kcore"
"github.com/tkrajina/gpxgo/gpx"
)
const garminTrackPointExtensionNamespace = "http://www.garmin.com/xmlschemas/TrackPointExtension/v1"
type Activity struct {
ID int64 `json:"id"`
Name string `json:"name"`
Type string `json:"type"`
SportType string `json:"sport_type"`
StartDate time.Time `json:"start_date"`
DistanceM float64 `json:"distance"`
MovingTimeS int64 `json:"moving_time"`
ElapsedTimeS int64 `json:"elapsed_time"`
TotalElevationGainM float64 `json:"total_elevation_gain"`
AverageSpeedMps float64 `json:"average_speed"`
}
func (c *Client) List(from, to time.Time) ([]Activity, error) {
return c.list(from, to, "Ride")
}
func (c *Client) list(from, to time.Time, types ...string) ([]Activity, error) {
allowed := map[string]bool{}
for _, t := range types {
allowed[t] = true
}
var all []Activity
for page := 1; ; page++ {
q := url.Values{}
q.Set("per_page", "200")
q.Set("page", strconv.Itoa(page))
if !from.IsZero() {
q.Set("after", strconv.FormatInt(from.Unix(), 10))
}
if !to.IsZero() {
q.Set("before", strconv.FormatInt(to.Unix(), 10))
}
var batch []Activity
err := c.GetJSON("/athlete/activities?"+q.Encode(), &batch)
if err != nil {
return nil, kcore.Wrap(err, "failed to list Strava activities")
}
if len(batch) == 0 {
break
}
for _, activity := range batch {
if len(allowed) == 0 || allowed[activity.Type] || allowed[activity.SportType] {
all = append(all, activity)
}
}
if len(batch) < 200 {
break
}
}
return all, nil
}
func (c *Client) Get(id int64) (Activity, []byte, error) {
var activity Activity
if err := c.GetJSON(fmt.Sprintf("/activities/%d", id), &activity); err != nil {
return Activity{}, nil, kcore.Wrap(err, "failed to get Strava activity")
}
streams, err := c.activityStreams(id)
if err != nil {
return Activity{}, nil, err
}
gpxData, err := activityGPX(activity, streams)
if err != nil {
return Activity{}, nil, err
}
return activity, gpxData, nil
}
type activityStreams struct {
LatLng [][2]float64
Altitude []float64
Seconds []float64
HeartRate []*float64
Cadence []*float64
Power []*float64
}
type nullableFloatStream struct {
Data []*float64 `json:"data"`
}
func (c *Client) activityStreams(id int64) (activityStreams, error) {
path := fmt.Sprintf("/activities/%d/streams?keys=latlng,altitude,time,heartrate,cadence,watts&key_by_type=true", id)
var streams struct {
LatLng *struct {
Data [][2]float64 `json:"data"`
} `json:"latlng"`
Altitude *struct {
Data []float64 `json:"data"`
} `json:"altitude"`
Time *struct {
Data []float64 `json:"data"`
} `json:"time"`
HeartRate *nullableFloatStream `json:"heartrate"`
Cadence *nullableFloatStream `json:"cadence"`
Power *nullableFloatStream `json:"watts"`
}
err := c.GetJSON(path, &streams)
if err != nil {
return activityStreams{}, kcore.Wrap(err, "failed to fetch Strava streams")
}
result := activityStreams{}
if streams.LatLng != nil {
result.LatLng = streams.LatLng.Data
}
if streams.Altitude != nil {
result.Altitude = streams.Altitude.Data
}
if streams.Time != nil {
result.Seconds = streams.Time.Data
}
if streams.HeartRate != nil {
result.HeartRate = streams.HeartRate.Data
}
if streams.Cadence != nil {
result.Cadence = streams.Cadence.Data
}
if streams.Power != nil {
result.Power = streams.Power.Data
}
return result, nil
}
func activityGPX(activity Activity, streams activityStreams) ([]byte, error) {
points := make([]gpx.GPXPoint, len(streams.LatLng))
for i := range streams.LatLng {
point := gpx.GPXPoint{}
point.Latitude = streams.LatLng[i][0]
point.Longitude = streams.LatLng[i][1]
if i < len(streams.Altitude) {
point.Elevation = *gpx.NewNullableFloat64(streams.Altitude[i])
}
if i < len(streams.Seconds) {
point.Timestamp = activity.StartDate.Add(time.Duration(streams.Seconds[i]) * time.Second)
}
addTrackPointMetric(&point, "hr", streamValue(streams.HeartRate, i))
addTrackPointMetric(&point, "cad", streamValue(streams.Cadence, i))
addTrackPointMetric(&point, "watts", streamValue(streams.Power, i))
points[i] = point
}
doc := gpx.GPX{
Version: "1.1",
Creator: "biking_home",
Name: activity.Name,
Tracks: []gpx.GPXTrack{{
Name: activity.Name,
Segments: []gpx.GPXTrackSegment{{Points: points}},
}},
}
doc.RegisterNamespace("gpxtpx", garminTrackPointExtensionNamespace)
xmlData, err := doc.ToXml(gpx.ToXmlParams{})
if err != nil {
return nil, kcore.Wrap(err, "failed to build GPX XML")
}
return xmlData, nil
}
func streamValue(stream []*float64, i int) *float64 {
if i >= len(stream) {
return nil
}
return stream[i]
}
func addTrackPointMetric(point *gpx.GPXPoint, name string, value *float64) {
if value == nil {
return
}
extension := point.Extensions.GetOrCreateNode(gpx.NamespaceURL(garminTrackPointExtensionNamespace), "TrackPointExtension")
extension.GetOrCreateNode(name).Data = strconv.FormatFloat(*value, 'f', -1, 64)
}
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