fix: calculate peak hour based on time spent instead of event count

Author: tduyng

core/stats.go

@@ -14,7 +14,7 @@ func CalculateStats(db *sql.DB, todayOnly bool) (Stats, error) {
 		Projects:       make(map[string]ProjectStat),
 		Languages:      make(map[string]LangStat),
 		DailyActivity:  make(map[string]DailyStat),
-		HourlyActivity: make(map[int]int),
+		HourlyActivity: make(map[int]int64),
 		TopFiles:       []FileStat{},
 		WeeklyHeatmap:  []HeatmapDay{},
 		Sessions:       []Session{},
@@ -168,9 +168,9 @@ func CalculateStats(db *sql.DB, todayOnly bool) (Stats, error) {
 		ds.Files++
 		stats.DailyActivity[date] = ds
 
-		// Hourly activity
+		// Hourly activity (track TIME, not count)
 		hour := timestamp.Hour()
-		stats.HourlyActivity[hour]++
+		stats.HourlyActivity[hour] += sessionDelta
 
 		// Aggregate totals
 		stats.TotalLines += lines
@@ -277,7 +277,7 @@ func filterTodayOnly(db *sql.DB, stats Stats, today string) Stats {
 	todayProjects := make(map[string]ProjectStat)
 	todayLanguages := make(map[string]LangStat)
 	todayTopFiles := []FileStat{}
-	todayHourlyActivity := make(map[int]int)
+	todayHourlyActivity := make(map[int]int64)
 
 	todayQuery := `SELECT timestamp, file, language, project, lines FROM heartbeats 
 			 WHERE substr(timestamp, 1, 10) = '` + today + `' ORDER BY timestamp`
@@ -344,9 +344,9 @@ func filterTodayOnly(db *sql.DB, stats Stats, today string) Stats {
 		todayFileStats[file].Lines += lines
 		todayFileStats[file].Time += sessionDelta
 
-		// Hourly activity (today only)
+		// Hourly activity (today only - track TIME, not count)
 		hour := timestamp.Hour()
-		todayHourlyActivity[hour]++
+		todayHourlyActivity[hour] += sessionDelta
 
 		todayTotalLines += lines
 	}
@@ -437,13 +437,13 @@ func calculateLongestStreak(daily map[string]DailyStat) int {
 	return longest
 }
 
-func calculateMostActiveHour(hourly map[int]int) int {
+func calculateMostActiveHour(hourly map[int]int64) int {
 	maxHour := 0
-	maxCount := 0
+	var maxTime int64
 
-	for hour, count := range hourly {
-		if count > maxCount {
-			maxCount = count
+	for hour, time := range hourly {
+		if time > maxTime {
+			maxTime = time
 			maxHour = hour
 		}
 	}

core/storage.go

@@ -64,7 +64,7 @@ type Stats struct {
 	Languages      map[string]LangStat    `json:"languages"`
 	TopFiles       []FileStat             `json:"top_files"`
 	DailyActivity  map[string]DailyStat   `json:"daily_activity"`
-	HourlyActivity map[int]int            `json:"hourly_activity"`
+	HourlyActivity map[int]int64          `json:"hourly_activity"` // hour -> time in seconds
 
 	// Weekly heatmap (last 12 weeks, for GitHub-style contribution grid)
 	// Keys are dates in "2006-01-02" format, values are activity levels 0-4