feat: Add data models and PostgreSQL storage layer

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-19 19:49:59 +01:00
parent a59ef0f3f5
commit cd435a6569
5 changed files with 766 additions and 0 deletions
--- a/backend/internal/storage/exercises.go
+++ b/backend/internal/storage/exercises.go
@@ -0,0 +1,121 @@
+package storage
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"training-tracker/internal/models"
+)
+
+type ExerciseRepository struct {
+	db *DB
+}
+
+func NewExerciseRepository(db *DB) *ExerciseRepository {
+	return &ExerciseRepository{db: db}
+}
+
+func (r *ExerciseRepository) List(ctx context.Context) ([]models.Exercise, error) {
+	query := `SELECT id, name, type, muscle_group, description, created_at
+			  FROM exercises ORDER BY name`
+
+	rows, err := r.db.QueryContext(ctx, query)
+	if err != nil {
+		return nil, fmt.Errorf("failed to query exercises: %w", err)
+	}
+	defer rows.Close()
+
+	var exercises []models.Exercise
+	for rows.Next() {
+		var e models.Exercise
+		var muscleGroup, description sql.NullString
+		if err := rows.Scan(&e.ID, &e.Name, &e.Type, &muscleGroup, &description, &e.CreatedAt); err != nil {
+			return nil, fmt.Errorf("failed to scan exercise: %w", err)
+		}
+		e.MuscleGroup = muscleGroup.String
+		e.Description = description.String
+		exercises = append(exercises, e)
+	}
+
+	return exercises, nil
+}
+
+func (r *ExerciseRepository) GetByID(ctx context.Context, id int64) (*models.Exercise, error) {
+	query := `SELECT id, name, type, muscle_group, description, created_at
+			  FROM exercises WHERE id = $1`
+
+	var e models.Exercise
+	var muscleGroup, description sql.NullString
+	err := r.db.QueryRowContext(ctx, query, id).Scan(&e.ID, &e.Name, &e.Type, &muscleGroup, &description, &e.CreatedAt)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("failed to get exercise: %w", err)
+	}
+	e.MuscleGroup = muscleGroup.String
+	e.Description = description.String
+
+	return &e, nil
+}
+
+func (r *ExerciseRepository) Create(ctx context.Context, req *models.CreateExerciseRequest) (*models.Exercise, error) {
+	query := `INSERT INTO exercises (name, type, muscle_group, description)
+			  VALUES ($1, $2, $3, $4)
+			  RETURNING id, name, type, muscle_group, description, created_at`
+
+	var e models.Exercise
+	var muscleGroup, description sql.NullString
+	err := r.db.QueryRowContext(ctx, query, req.Name, req.Type, nullString(req.MuscleGroup), nullString(req.Description)).
+		Scan(&e.ID, &e.Name, &e.Type, &muscleGroup, &description, &e.CreatedAt)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create exercise: %w", err)
+	}
+	e.MuscleGroup = muscleGroup.String
+	e.Description = description.String
+
+	return &e, nil
+}
+
+func (r *ExerciseRepository) Update(ctx context.Context, id int64, req *models.CreateExerciseRequest) (*models.Exercise, error) {
+	query := `UPDATE exercises
+			  SET name = $1, type = $2, muscle_group = $3, description = $4
+			  WHERE id = $5
+			  RETURNING id, name, type, muscle_group, description, created_at`
+
+	var e models.Exercise
+	var muscleGroup, description sql.NullString
+	err := r.db.QueryRowContext(ctx, query, req.Name, req.Type, nullString(req.MuscleGroup), nullString(req.Description), id).
+		Scan(&e.ID, &e.Name, &e.Type, &muscleGroup, &description, &e.CreatedAt)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("failed to update exercise: %w", err)
+	}
+	e.MuscleGroup = muscleGroup.String
+	e.Description = description.String
+
+	return &e, nil
+}
+
+func (r *ExerciseRepository) Delete(ctx context.Context, id int64) error {
+	query := `DELETE FROM exercises WHERE id = $1`
+	result, err := r.db.ExecContext(ctx, query, id)
+	if err != nil {
+		return fmt.Errorf("failed to delete exercise: %w", err)
+	}
+	rows, _ := result.RowsAffected()
+	if rows == 0 {
+		return sql.ErrNoRows
+	}
+	return nil
+}
+
+func nullString(s string) sql.NullString {
+	if s == "" {
+		return sql.NullString{}
+	}
+	return sql.NullString{String: s, Valid: true}
+}