From 059b0aebeffa117c539a98678950c10c0f69a73d Mon Sep 17 00:00:00 2001
From: Florian Forster <ff@octo.it>
Date: Tue, 16 Jan 2018 22:37:42 +0100
Subject: [PATCH] Implement distance conversion.

---
 gfit/gfit.go | 24 ++++++++++++++++++++++++
 gfitsync.go  | 12 ++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/gfit/gfit.go b/gfit/gfit.go
index ea41b95..37d30b4 100644
--- a/gfit/gfit.go
+++ b/gfit/gfit.go
@@ -22,6 +22,7 @@ const (
 	userID    = "me"
 
 	dataTypeNameCalories  = "com.google.calories.expended"
+	dataTypeNameDistance  = "com.google.distance.delta"
 	dataTypeNameSteps     = "com.google.step_count.delta"
 	dataTypeNameHeartrate = "com.google.heart_rate.summary"
 )
@@ -34,6 +35,7 @@ var oauthConfig = &oauth2.Config{
 	Scopes: []string{
 		fitness.FitnessActivityWriteScope,
 		fitness.FitnessBodyWriteScope,
+		fitness.FitnessLocationWriteScope,
 	},
 }
 
@@ -146,6 +148,28 @@ func (c *Client) DataSetPatch(ctx context.Context, dataSourceID string, points [
 	return nil
 }
 
+func (c *Client) SetDistance(ctx context.Context, meters float64, startOfDay time.Time) error {
+	return c.updateCumulative(ctx,
+		&fitness.DataSource{
+			Application: Application(ctx),
+			DataType: &fitness.DataType{
+				Field: []*fitness.DataTypeField{
+					&fitness.DataTypeField{
+						Name:   "distance",
+						Format: "floatPoint",
+					},
+				},
+				Name: dataTypeNameDistance,
+			},
+			Name: "Distance covered",
+			Type: "raw",
+		},
+		&fitness.Value{
+			FpVal: meters,
+		},
+		startOfDay)
+}
+
 func (c *Client) SetSteps(ctx context.Context, totalSteps int, startOfDay time.Time) error {
 	return c.updateCumulative(ctx,
 		&fitness.DataSource{
diff --git a/gfitsync.go b/gfitsync.go
index c5b4b62..28c0685 100644
--- a/gfitsync.go
+++ b/gfitsync.go
@@ -259,6 +259,18 @@ func handleNotification(ctx context.Context, s *fitbit.Subscription) error {
 		return fmt.Errorf("gfitClient.SetCalories(%d) = %v", summary.Summary.CaloriesOut, err)
 	}
 
+	var distanceMeters float64
+	for _, d := range summary.Summary.Distances {
+		if d.Activity != "total" {
+			continue
+		}
+		distanceMeters = 1000.0 * d.Distance
+		break
+	}
+	if err := gfitClient.SetDistance(ctx, distanceMeters, tm); err != nil {
+		return fmt.Errorf("gfitClient.SetDistance(%d) = %v", distanceMeters, err)
+	}
+
 	if err := gfitClient.SetHeartRate(ctx, summary.Summary.HeartRateZones, summary.Summary.RestingHeartRate, tm); err != nil {
 		return fmt.Errorf("gfitClient.SetHeartRate() = %v", err)
 	}
-- 
2.11.0