Add calendar support

1 files changed, 112 insertions, 0 deletions

diff --git a/pkg/calendar/service.go b/pkg/calendar/service.go
new file mode 100644
index 0000000..19b2d9d
--- /dev/null
+++ b/pkg/calendar/service.go
@@ -0,0 +1,112 @@
+package calendar
+
+import (
+	"context"
+	"crypto/rand"
+	"errors"
+	"fmt"
+	"math/big"
+
+	"github.com/LMBishop/confplanner/pkg/database/sqlc"
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type Service interface {
+	GetCalendarForUser(id int32) (*sqlc.Calendar, error)
+	GetCalendarByName(name string) (*sqlc.Calendar, error)
+	CreateCalendarForUser(id int32) (*sqlc.Calendar, error)
+	DeleteCalendarForUser(id int32) error
+}
+
+var (
+	ErrCalendarNotFound = errors.New("calendar not found")
+)
+
+type service struct {
+	pool *pgxpool.Pool
+}
+
+func NewService(pool *pgxpool.Pool) Service {
+	return &service{
+		pool: pool,
+	}
+}
+
+func (s *service) GetCalendarForUser(id int32) (*sqlc.Calendar, error) {
+	queries := sqlc.New(s.pool)
+
+	calendar, err := queries.GetCalendarForUser(context.Background(), id)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return nil, ErrCalendarNotFound
+		}
+		return nil, err
+	}
+
+	return &calendar, nil
+}
+
+func (s *service) GetCalendarByName(name string) (*sqlc.Calendar, error) {
+	queries := sqlc.New(s.pool)
+
+	calendar, err := queries.GetCalendarByName(context.Background(), name)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return nil, ErrCalendarNotFound
+		}
+		return nil, err
+	}
+
+	return &calendar, nil
+}
+
+func (s *service) CreateCalendarForUser(id int32) (*sqlc.Calendar, error) {
+	queries := sqlc.New(s.pool)
+
+	name, err := randomString(16)
+	if err != nil {
+		return nil, fmt.Errorf("could not generate random string: %w", err)
+	}
+
+	key, err := randomString(32)
+	if err != nil {
+		return nil, fmt.Errorf("could not generate random string: %w", err)
+	}
+
+	calendar, err := queries.CreateCalendar(context.Background(), sqlc.CreateCalendarParams{
+		UserID: id,
+		Name:   name,
+		Key:    key,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("could not create calendar: %w", err)
+	}
+
+	return &calendar, nil
+}
+
+func (s *service) DeleteCalendarForUser(id int32) error {
+	queries := sqlc.New(s.pool)
+
+	_, err := queries.DeleteCalendar(context.Background(), id)
+	if err != nil {
+		return fmt.Errorf("could not delete calendar: %w", err)
+	}
+
+	return nil
+}
+
+func randomString(n int) (string, error) {
+	const letters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+	ret := make([]byte, n)
+	for i := 0; i < n; i++ {
+		num, err := rand.Int(rand.Reader, big.NewInt(int64(len(letters))))
+		if err != nil {
+			return "", err
+		}
+		ret[i] = letters[num.Int64()]
+	}
+
+	return string(ret), nil
+}