Add user auth, cart, checkout and personal account for guests and registered users

internal/repository/user.go

@@ -0,0 +1,75 @@
+package repository
+
+import (
+	"context"
+	"errors"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+	"golang.org/x/crypto/bcrypt"
+
+	"shop/internal/models"
+)
+
+type UserRepository struct {
+	pool *pgxpool.Pool
+}
+
+func NewUserRepository(pool *pgxpool.Pool) *UserRepository {
+	return &UserRepository{pool: pool}
+}
+
+func (r *UserRepository) Create(ctx context.Context, email, password, name string) (models.User, error) {
+	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return models.User{}, err
+	}
+
+	var u models.User
+	err = r.pool.QueryRow(ctx, `
+		INSERT INTO users (email, password_hash, name)
+		VALUES ($1, $2, $3)
+		RETURNING id, email, name, phone, address, created_at
+	`, email, string(hash), name).Scan(&u.ID, &u.Email, &u.Name, &u.Phone, &u.Address, &u.CreatedAt)
+	return u, err
+}
+
+func (r *UserRepository) Authenticate(ctx context.Context, email, password string) (models.User, error) {
+	var hash string
+	var u models.User
+	err := r.pool.QueryRow(ctx, `
+		SELECT id, email, name, phone, address, created_at, password_hash
+		FROM users WHERE email = $1
+	`, email).Scan(&u.ID, &u.Email, &u.Name, &u.Phone, &u.Address, &u.CreatedAt, &hash)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return models.User{}, pgx.ErrNoRows
+	}
+	if err != nil {
+		return models.User{}, err
+	}
+	if bcrypt.CompareHashAndPassword([]byte(hash), []byte(password)) != nil {
+		return models.User{}, pgx.ErrNoRows
+	}
+	return u, nil
+}
+
+func (r *UserRepository) GetByID(ctx context.Context, id int) (models.User, error) {
+	var u models.User
+	err := r.pool.QueryRow(ctx, `
+		SELECT id, email, name, phone, address, created_at FROM users WHERE id = $1
+	`, id).Scan(&u.ID, &u.Email, &u.Name, &u.Phone, &u.Address, &u.CreatedAt)
+	return u, err
+}
+
+func (r *UserRepository) UpdateProfile(ctx context.Context, u *models.User) error {
+	_, err := r.pool.Exec(ctx, `
+		UPDATE users SET name = $1, phone = $2, address = $3 WHERE id = $4
+	`, u.Name, u.Phone, u.Address, u.ID)
+	return err
+}
+
+func (r *UserRepository) EmailExists(ctx context.Context, email string) (bool, error) {
+	var exists bool
+	err := r.pool.QueryRow(ctx, `SELECT EXISTS(SELECT 1 FROM users WHERE email = $1)`, email).Scan(&exists)
+	return exists, err
+}