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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
}
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