checkpoint 3

internal/parser/activity/activity.go

@@ -0,0 +1,35 @@
+package parser
+
+import "time"
+
+// ActivityMetrics contains all metrics extracted from activity files
+type ActivityMetrics struct {
+	ActivityType   string
+	StartTime      time.Time
+	Duration       time.Duration
+	Distance       float64 // in meters
+	MaxHeartRate   int
+	AvgHeartRate   int
+	AvgPower       int
+	Calories       int
+	Steps          int
+	ElevationGain  float64 // in meters
+	ElevationLoss  float64 // in meters
+	MinTemperature float64 // in °C
+	MaxTemperature float64 // in °C
+	AvgTemperature float64 // in °C
+}
+
+// Parser defines the interface for activity file parsers
+type Parser interface {
+	ParseFile(filename string) (*ActivityMetrics, error)
+}
+
+// FileType represents supported file formats
+type FileType string
+
+const (
+	FIT FileType = "fit"
+	TCX FileType = "tcx"
+	GPX FileType = "gpx"
+)