checkpoint 1

internal/parser/fit_parser.go

@@ -0,0 +1,91 @@
+package parser
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"time"
+
+	"github.com/tormoder/fit"
+)
+
+type FITParser struct{}
+
+func NewFITParser() *FITParser {
+	return &FITParser{}
+}
+
+func (p *FITParser) ParseFile(filename string) (*ActivityMetrics, error) {
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	data, err := io.ReadAll(file)
+	if err != nil {
+		return nil, err
+	}
+
+	return p.ParseData(data)
+}
+
+func (p *FITParser) ParseData(data []byte) (*ActivityMetrics, error) {
+	fitFile, err := fit.Decode(data)
+	if err != nil {
+		return nil, fmt.Errorf("failed to decode FIT file: %w", err)
+	}
+
+	activity, err := fitFile.Activity()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get activity from FIT: %w", err)
+	}
+
+	if len(activity.Sessions) == 0 {
+		return nil, fmt.Errorf("no sessions found in FIT file")
+	}
+
+	session := activity.Sessions[0]
+	metrics := &ActivityMetrics{}
+
+	// Basic activity metrics
+	metrics.StartTime = session.StartTime
+	metrics.Duration = time.Duration(session.TotalTimerTime) * time.Second
+	metrics.Distance = session.TotalDistance
+
+	// Heart rate
+	if session.AvgHeartRate != nil {
+		metrics.AvgHeartRate = int(*session.AvgHeartRate)
+	}
+	if session.MaxHeartRate != nil {
+		metrics.MaxHeartRate = int(*session.MaxHeartRate)
+	}
+
+	// Power
+	if session.AvgPower != nil {
+		metrics.AvgPower = int(*session.AvgPower)
+	}
+
+	// Calories
+	if session.TotalCalories != nil {
+		metrics.Calories = int(*session.TotalCalories)
+	}
+
+	// Elevation
+	if session.TotalAscent != nil {
+		metrics.ElevationGain = *session.TotalAscent
+	}
+	if session.TotalDescent != nil {
+		metrics.ElevationLoss = *session.TotalDescent
+	}
+
+	// Steps
+	if session.Steps != nil {
+		metrics.Steps = int(*session.Steps)
+	}
+
+	// Temperature - FIT typically doesn't store temp in session summary
+	// We'll leave temperature fields as 0 for FIT files
+
+	return metrics, nil
+}