feat: add complete workout management system with file parsing

internal/workout/service.go

@@ -0,0 +1,88 @@
+package workout
+
+import (
+	"errors"
+	"time"
+)
+
+type Service struct {
+	repo *Repository
+}
+
+func NewService() *Service {
+	return &Service{
+		repo: NewRepository(),
+	}
+}
+
+func (s *Service) CreateWorkout(userID uint, title string, scheduledDate time.Time, duration int) (*Workout, error) {
+	if title == "" {
+		return nil, errors.New("title is required")
+	}
+
+	workout := &Workout{
+		UserID:        userID,
+		Title:         title,
+		ScheduledDate: scheduledDate,
+		Duration:      duration,
+		Status:        "planned",
+	}
+
+	if err := s.repo.CreateWorkout(workout); err != nil {
+		return nil, err
+	}
+
+	return workout, nil
+}
+
+func (s *Service) GetUserWorkouts(userID uint) ([]Workout, error) {
+	return s.repo.GetUserWorkouts(userID)
+}
+
+func (s *Service) GetWorkoutsByMonth(userID uint, year, month int) ([]Workout, error) {
+	return s.repo.GetWorkoutsByMonth(userID, year, month)
+}
+
+func (s *Service) UpdateWorkoutStatus(id, userID uint, status string) (*Workout, error) {
+	if status != "planned" && status != "completed" && status != "skipped" {
+		return nil, errors.New("invalid status")
+	}
+
+	workout, err := s.repo.GetWorkoutByID(id, userID)
+	if err != nil {
+		return nil, err
+	}
+
+	workout.Status = status
+	if status == "completed" {
+		workout.UpdatedAt = time.Now()
+	}
+
+	if err := s.repo.UpdateWorkout(workout); err != nil {
+		return nil, err
+	}
+
+	return workout, nil
+}
+
+func (s *Service) UpdateWorkoutWithMetrics(id, userID uint, distance float64, avgPower, avgHR int) (*Workout, error) {
+	workout, err := s.repo.GetWorkoutByID(id, userID)
+	if err != nil {
+		return nil, err
+	}
+
+	workout.Distance = distance
+	workout.AvgPower = avgPower
+	workout.AvgHR = avgHR
+	workout.Status = "completed"
+
+	if err := s.repo.UpdateWorkout(workout); err != nil {
+		return nil, err
+	}
+
+	return workout, nil
+}
+
+func (s *Service) DeleteWorkout(id, userID uint) error {
+	return s.repo.DeleteWorkout(id, userID)
+}