lots of stuff, don't truly remember

internal/stats/repository.go

@@ -43,6 +43,21 @@ type PeriodStats struct {
 	AvgHR         float64 `json:"avg_hr"`
 }
 
+// DailyTSS holds the computed TSS for a single day.
+type DailyTSS struct {
+	Date string  `json:"date"`
+	TSS  float64 `json:"tss"`
+}
+
+// PowerPoint holds power data for a single completed workout.
+type PowerPoint struct {
+	Date     string `json:"date"`
+	AvgPower int    `json:"avg_power"`
+	MaxPower int    `json:"max_power"`
+	Duration int    `json:"duration"`
+	Title    string `json:"title"`
+}
+
 // GetSummary returns overall ride statistics for completed workouts.
 func (r *Repository) GetSummary(userID uint) (*Summary, error) {
 	var summary Summary
@@ -120,6 +135,65 @@ func (r *Repository) GetMonthlyStats(userID uint, months int) ([]PeriodStats, er
 	return stats, err
 }
 
+// GetDailyTSS returns daily TSS values for the last N days.
+// TSS = (duration_seconds * (avg_power / FTP)^2 / 3600) * 100
+// Simplified: (duration * avg_power^2) / (FTP^2 * 36)
+func (r *Repository) GetDailyTSS(userID uint, ftp int, days int) ([]DailyTSS, error) {
+	if ftp <= 0 {
+		return []DailyTSS{}, nil
+	}
+
+	cutoff := time.Now().AddDate(0, 0, -days)
+	ftpFloat := float64(ftp)
+
+	var results []DailyTSS
+	err := database.DB.Model(&workout.Workout{}).
+		Select(`
+			TO_CHAR(scheduled_date, 'YYYY-MM-DD') as date,
+			COALESCE(SUM(
+				CASE WHEN avg_power > 0 AND duration > 0
+					THEN (duration::float8 * avg_power::float8 * avg_power::float8) / (? * ? * 36.0)
+					ELSE 0
+				END
+			), 0) as tss
+		`, ftpFloat, ftpFloat).
+		Where("user_id = ? AND status = ? AND scheduled_date >= ?", userID, "completed", cutoff).
+		Group("date").
+		Order("date ASC").
+		Scan(&results).Error
+
+	if results == nil {
+		results = []DailyTSS{}
+	}
+
+	return results, err
+}
+
+// GetPowerHistory returns power data points for completed workouts in the last N days.
+func (r *Repository) GetPowerHistory(userID uint, days int) ([]PowerPoint, error) {
+	cutoff := time.Now().AddDate(0, 0, -days)
+
+	var results []PowerPoint
+	err := database.DB.Model(&workout.Workout{}).
+		Select(`
+			TO_CHAR(scheduled_date, 'YYYY-MM-DD') as date,
+			avg_power,
+			max_power,
+			duration,
+			title
+		`).
+		Where("user_id = ? AND status = ? AND avg_power > 0 AND scheduled_date >= ?",
+			userID, "completed", cutoff).
+		Order("scheduled_date ASC").
+		Scan(&results).Error
+
+	if results == nil {
+		results = []PowerPoint{}
+	}
+
+	return results, err
+}
+
 // PersonalBest holds a single personal best record.
 type PersonalBest struct {
 	Category  string      `json:"category"`