| 1 | package calendar |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | "time" |
| 7 | |
| 8 | "gorm.io/gorm" |
| 9 | |
| 10 | "amadan.net/oficina/calendar/internal/calendar/seal" |
| 11 | ) |
| 12 | |
| 13 | // CancelBooking is the booker's cancel: confirmed → cancelled, the |
| 14 | // event cancelled with a sequence bump, the reminder rows gone, every |
| 15 | // unsent message forgotten, and the cancelled messages owed to both |
| 16 | // (booking spec §5.6, §5.7). A second press affects zero rows. |
| 17 | func (s *Store) CancelBooking(ctx context.Context, bookingID int64, by string, now time.Time) (changed bool, err error) { |
| 18 | err = s.g.WithContext(ctx).Transaction(func(tx *gorm.DB) error { |
| 19 | var b Booking |
| 20 | if err := tx.First(&b, bookingID).Error; err != nil { |
| 21 | return fmt.Errorf("calendar: read booking: %w", err) |
| 22 | } |
| 23 | n, err := cancelBookingOn(tx, b, by, now) |
| 24 | if err != nil { |
| 25 | return err |
| 26 | } |
| 27 | if n == 0 { |
| 28 | return nil |
| 29 | } |
| 30 | changed = true |
| 31 | if err := tx.Model(&Event{}).Where("id = ? AND deleted_at IS NULL", b.EventID). |
| 32 | Updates(map[string]any{"status": StatusCancelled, "sequence": gorm.Expr("sequence + 1"), "updated_at": now.UTC()}).Error; err != nil { |
| 33 | return fmt.Errorf("calendar: cancel booked event: %w", err) |
| 34 | } |
| 35 | return nil |
| 36 | }) |
| 37 | return changed, err |
| 38 | } |
| 39 | |
| 40 | // cancelBookingOn is the confirmed → cancelled row transition and its |
| 41 | // side effects, on a transaction, without touching the event — the |
| 42 | // caller owns the event (the booker's cancel sets it cancelled; the |
| 43 | // host's own UpdateEvent/DeleteEvent already did). Returns rows moved. |
| 44 | func cancelBookingOn(tx *gorm.DB, b Booking, by string, now time.Time) (int64, error) { |
| 45 | res := tx.Model(&Booking{}). |
| 46 | Where("id = ? AND state = ?", b.ID, BookingConfirmed). |
| 47 | Updates(map[string]any{"state": BookingCancelled, "cancelled_at": now.Unix(), "cancelled_by": by, "updated_at": now.UTC()}) |
| 48 | if res.Error != nil { |
| 49 | return 0, fmt.Errorf("calendar: cancel booking: %w", res.Error) |
| 50 | } |
| 51 | if res.RowsAffected == 0 { |
| 52 | return 0, nil |
| 53 | } |
| 54 | if err := deleteReminderRowsFor(tx, b.EventID); err != nil { |
| 55 | return 0, err |
| 56 | } |
| 57 | if err := deleteUnsentMail(tx, b.ID); err != nil { |
| 58 | return 0, err |
| 59 | } |
| 60 | var e Event |
| 61 | if err := tx.First(&e, b.EventID).Error; err != nil { |
| 62 | return 0, fmt.Errorf("calendar: read cancelled event: %w", err) |
| 63 | } |
| 64 | // The revision the cancellation mail carries is the one the |
| 65 | // caller's event bump will produce. |
| 66 | to := []string{ToBooker} |
| 67 | if by == CancelledByBooker { |
| 68 | to = []string{ToBooker, ToHost} |
| 69 | } |
| 70 | if err := queueBookingMail(tx, b.ID, MailCancelled, to, e.Sequence+1, now); err != nil { |
| 71 | return 0, err |
| 72 | } |
| 73 | return 1, nil |
| 74 | } |
| 75 | |
| 76 | // cancelBookingsForEvent is what the HOST's cancel or delete does to a |
| 77 | // booking (booking spec §5.5): a confirmed booking is cancelled by the |
| 78 | // host and the booker is told; a held one simply expires, and nobody is |
| 79 | // told — there was nothing to tell them yet. |
| 80 | func cancelBookingsForEvent(tx *gorm.DB, eventID int64, now time.Time) error { |
| 81 | b, ok, err := bookingFor(tx, eventID) |
| 82 | if err != nil || !ok { |
| 83 | return err |
| 84 | } |
| 85 | switch b.State { |
| 86 | case BookingConfirmed: |
| 87 | _, err := cancelBookingOn(tx, b, CancelledByHost, now) |
| 88 | return err |
| 89 | case BookingHeld: |
| 90 | res := tx.Model(&Booking{}).Where("id = ? AND state = ?", b.ID, BookingHeld). |
| 91 | Updates(map[string]any{"state": BookingExpired, "updated_at": now.UTC()}) |
| 92 | if res.Error != nil { |
| 93 | return fmt.Errorf("calendar: expire held booking: %w", res.Error) |
| 94 | } |
| 95 | if res.RowsAffected == 0 { |
| 96 | return nil // confirmed under us; that transition owns the rest |
| 97 | } |
| 98 | if err := deleteReminderRowsFor(tx, eventID); err != nil { |
| 99 | return err |
| 100 | } |
| 101 | return deleteUnsentMail(tx, b.ID) |
| 102 | } |
| 103 | return nil |
| 104 | } |
| 105 | |
| 106 | // openBookerAddress opens just the address, for the attendee row. |
| 107 | func (s *Store) openBookerAddress(b Booking) (string, error) { |
| 108 | addr, err := s.seal.OpenString(seal.PurposeBookerAddress, b.BookerAddressSealed) |
| 109 | if err != nil { |
| 110 | return "", fmt.Errorf("calendar: open booker address (booking %d): %w", b.ID, err) |
| 111 | } |
| 112 | return addr, nil |
| 113 | } |
| 114 | |
| 115 | // bookedEventRules is B18: the host's form may change an event's |
| 116 | // title, notes, location and — within the booking's state — its |
| 117 | // status; everything that schedules it belongs to the booking flow. |
| 118 | // Compared against the STORED row inside UpdateEvent's transaction, so |
| 119 | // a stale form that re-submits a time from before a public reschedule |
| 120 | // is refused, and one that re-submits the current time passes. |
| 121 | func bookedEventRules(existing Event, in EventInput, b Booking) error { |
| 122 | const moved = "This is a booked meeting. Its time is changed by the person who booked it, or by cancelling and letting them rebook." |
| 123 | switch { |
| 124 | case in.StartLocal != existing.StartLocal: |
| 125 | return ValidationError{"start", moved} |
| 126 | case in.EndLocal != existing.EndLocal: |
| 127 | return ValidationError{"end", moved} |
| 128 | case in.TZ != existing.TZ: |
| 129 | return ValidationError{"tz", moved} |
| 130 | case in.AllDay != existing.AllDay: |
| 131 | return ValidationError{"all_day", moved} |
| 132 | case in.Kind != existing.Kind: |
| 133 | return ValidationError{"kind", moved} |
| 134 | case in.RRule != existing.RRule: |
| 135 | return ValidationError{"repeat", "This is a booked meeting; it cannot repeat."} |
| 136 | } |
| 137 | switch b.State { |
| 138 | case BookingHeld: |
| 139 | if in.Status == StatusConfirmed { |
| 140 | return ValidationError{"status", "Only the person who booked this can confirm it."} |
| 141 | } |
| 142 | if in.Status != StatusTentative && in.Status != StatusCancelled { |
| 143 | return ValidationError{"status", "A held booking is tentative until the person who booked it confirms it."} |
| 144 | } |
| 145 | case BookingConfirmed: |
| 146 | if in.Status != StatusConfirmed && in.Status != StatusCancelled { |
| 147 | return ValidationError{"status", "A booked meeting is confirmed or cancelled."} |
| 148 | } |
| 149 | default: // cancelled, expired |
| 150 | if in.Status == StatusConfirmed { |
| 151 | return ValidationError{"status", "This booking was cancelled. Make a new event instead."} |
| 152 | } |
| 153 | if in.Status != StatusCancelled { |
| 154 | return ValidationError{"status", "This booking was cancelled."} |
| 155 | } |
| 156 | } |
| 157 | return nil |
| 158 | } |
| 159 | |
amadan