| 1 | package calendar |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | "sort" |
| 7 | "strings" |
| 8 | "time" |
| 9 | |
| 10 | "gorm.io/gorm" |
| 11 | |
| 12 | "amadan.net/oficina/calendar/internal/calendar/seal" |
| 13 | ) |
| 14 | |
| 15 | // BookingPageInput is what a settings form may set on a page. An |
| 16 | // explicit struct rather than the model: the columns it lacks — |
| 17 | // person_id, code, published_at — are exactly the ones a hidden field |
| 18 | // must not move. |
| 19 | type BookingPageInput struct { |
| 20 | Title, Description, Availability string |
| 21 | DurationMin, BufferMin, NoticeMin, HorizonDays int |
| 22 | } |
| 23 | |
| 24 | // BookingPageView is a page with its sealed columns opened and its |
| 25 | // windows loaded. Handlers and templates see this; the sealed struct |
| 26 | // never leaves the store. |
| 27 | type BookingPageView struct { |
| 28 | BookingPage |
| 29 | Title, Description, Availability string |
| 30 | Windows []Window |
| 31 | Published bool |
| 32 | } |
| 33 | |
| 34 | // ValidateBookingPageInput trims in place and reports the first problem. |
| 35 | // |
| 36 | // The text limits are BYTES, as the event validator's are. The windows |
| 37 | // are validated separately by validateWindows because they arrive from |
| 38 | // the parser, not the form. |
| 39 | func ValidateBookingPageInput(in *BookingPageInput) error { |
| 40 | in.Title = strings.TrimSpace(in.Title) |
| 41 | in.Description = strings.TrimSpace(in.Description) |
| 42 | in.Availability = strings.TrimSpace(in.Availability) |
| 43 | |
| 44 | if in.Title == "" { |
| 45 | return ValidationError{"title", "Give it a name."} |
| 46 | } |
| 47 | if len(in.Title) > MaxPageTitleBytes { |
| 48 | return ValidationError{"title", "Keep the name shorter."} |
| 49 | } |
| 50 | if len(in.Description) > MaxPageDescBytes { |
| 51 | return ValidationError{"description", "Keep the description shorter."} |
| 52 | } |
| 53 | if in.DurationMin < 5 || in.DurationMin > 480 { |
| 54 | return ValidationError{"duration_min", "Between 5 minutes and 8 hours."} |
| 55 | } |
| 56 | if in.BufferMin < 0 || in.BufferMin > 120 { |
| 57 | return ValidationError{"buffer_min", "Between 0 and 120 minutes."} |
| 58 | } |
| 59 | if in.NoticeMin < 0 || in.NoticeMin > 10080 { |
| 60 | return ValidationError{"notice_min", "Between 0 minutes and a week."} |
| 61 | } |
| 62 | if in.HorizonDays < 1 || in.HorizonDays > 90 { |
| 63 | return ValidationError{"horizon_days", "Between 1 and 90 days."} |
| 64 | } |
| 65 | return nil |
| 66 | } |
| 67 | |
| 68 | // validateWindows refuses a window the slot arithmetic would loop or |
| 69 | // misplace on, and returns them sorted by weekday then start. Merging |
| 70 | // adjacent windows is the parser's job; the store trusts its caller |
| 71 | // for that and defends only the invariants a row must hold. |
| 72 | func validateWindows(ws []Window) ([]Window, error) { |
| 73 | out := make([]Window, 0, len(ws)) |
| 74 | for _, w := range ws { |
| 75 | if w.Weekday < time.Sunday || w.Weekday > time.Saturday { |
| 76 | return nil, ValidationError{"availability", "A window names a day that does not exist."} |
| 77 | } |
| 78 | if w.StartMin < 0 || w.StartMin >= w.EndMin || w.EndMin > 1440 { |
| 79 | return nil, ValidationError{"availability", "A window ends before it starts."} |
| 80 | } |
| 81 | out = append(out, w) |
| 82 | } |
| 83 | sort.Slice(out, func(i, j int) bool { |
| 84 | if out[i].Weekday != out[j].Weekday { |
| 85 | return out[i].Weekday < out[j].Weekday |
| 86 | } |
| 87 | return out[i].StartMin < out[j].StartMin |
| 88 | }) |
| 89 | return out, nil |
| 90 | } |
| 91 | |
| 92 | // sealPage seals the three text columns of a page. |
| 93 | func (s *Store) sealPage(in BookingPageInput) (title, desc, avail []byte, err error) { |
| 94 | if title, err = s.seal.SealString(seal.PurposeBookingTitle, in.Title); err != nil { |
| 95 | return nil, nil, nil, fmt.Errorf("calendar: seal page title: %w", err) |
| 96 | } |
| 97 | if desc, err = s.seal.SealString(seal.PurposeBookingDescription, in.Description); err != nil { |
| 98 | return nil, nil, nil, fmt.Errorf("calendar: seal page description: %w", err) |
| 99 | } |
| 100 | if avail, err = s.seal.SealString(seal.PurposeBookingAvailability, in.Availability); err != nil { |
| 101 | return nil, nil, nil, fmt.Errorf("calendar: seal page availability: %w", err) |
| 102 | } |
| 103 | return title, desc, avail, nil |
| 104 | } |
| 105 | |
| 106 | // CreateBookingPage makes an unpublished page with a fresh code. |
| 107 | // |
| 108 | // The (person_id, code) index is unique, and a collision on eight |
| 109 | // random characters is regenerated once before it is an error — the |
| 110 | // spec's rule for the booking token, applied here for the same reason. |
| 111 | func (s *Store) CreateBookingPage(ctx context.Context, personID int64, in BookingPageInput, windows []Window) (BookingPage, error) { |
| 112 | if err := ValidateBookingPageInput(&in); err != nil { |
| 113 | return BookingPage{}, err |
| 114 | } |
| 115 | ws, err := validateWindows(windows) |
| 116 | if err != nil { |
| 117 | return BookingPage{}, err |
| 118 | } |
| 119 | title, desc, avail, err := s.sealPage(in) |
| 120 | if err != nil { |
| 121 | return BookingPage{}, err |
| 122 | } |
| 123 | now := time.Now().UTC() |
| 124 | page := BookingPage{ |
| 125 | PersonID: personID, TitleSealed: title, DescriptionSealed: desc, |
| 126 | DurationMin: in.DurationMin, BufferMin: in.BufferMin, |
| 127 | NoticeMin: in.NoticeMin, HorizonDays: in.HorizonDays, |
| 128 | AvailabilitySealed: avail, CreatedAt: now, UpdatedAt: now, |
| 129 | } |
| 130 | err = s.g.WithContext(ctx).Transaction(func(tx *gorm.DB) error { |
| 131 | for attempt := 0; ; attempt++ { |
| 132 | code, err := newPageCode() |
| 133 | if err != nil { |
| 134 | return err |
| 135 | } |
| 136 | page.Code = code |
| 137 | err = tx.Create(&page).Error |
| 138 | if err == nil { |
| 139 | break |
| 140 | } |
| 141 | if !isUniqueViolation(err) || attempt >= 1 { |
| 142 | return fmt.Errorf("calendar: create booking page: %w", err) |
| 143 | } |
| 144 | } |
| 145 | return insertWindows(tx, page.ID, ws) |
| 146 | }) |
| 147 | if err != nil { |
| 148 | return BookingPage{}, err |
| 149 | } |
| 150 | return page, nil |
| 151 | } |
| 152 | |
| 153 | // insertWindows writes a page's windows. The caller has already |
| 154 | // deleted the old ones inside the same transaction, if there were any. |
| 155 | func insertWindows(tx *gorm.DB, pageID int64, ws []Window) error { |
| 156 | for _, w := range ws { |
| 157 | row := BookingWindow{PageID: pageID, Weekday: int(w.Weekday), StartMin: w.StartMin, EndMin: w.EndMin} |
| 158 | if err := tx.Create(&row).Error; err != nil { |
| 159 | return fmt.Errorf("calendar: add booking window: %w", err) |
| 160 | } |
| 161 | } |
| 162 | return nil |
| 163 | } |
| 164 | |
| 165 | // UpdateBookingPage rewrites a page's text, knobs and windows. The code |
| 166 | // and the publication state are untouched: an edit to a page changes |
| 167 | // what future bookings say, never where the page lives. |
| 168 | // |
| 169 | // Scoped by `id = ? AND person_id = ?`, and a miss is ErrNotFound — |
| 170 | // a page that isn't yours doesn't exist. |
| 171 | func (s *Store) UpdateBookingPage(ctx context.Context, personID, pageID int64, in BookingPageInput, windows []Window) error { |
| 172 | if err := ValidateBookingPageInput(&in); err != nil { |
| 173 | return err |
| 174 | } |
| 175 | ws, err := validateWindows(windows) |
| 176 | if err != nil { |
| 177 | return err |
| 178 | } |
| 179 | title, desc, avail, err := s.sealPage(in) |
| 180 | if err != nil { |
| 181 | return err |
| 182 | } |
| 183 | return s.g.WithContext(ctx).Transaction(func(tx *gorm.DB) error { |
| 184 | res := tx.Model(&BookingPage{}).Where("id = ? AND person_id = ?", pageID, personID). |
| 185 | Updates(map[string]any{ |
| 186 | "title_sealed": title, |
| 187 | "description_sealed": desc, |
| 188 | "availability_text_sealed": avail, |
| 189 | "duration_min": in.DurationMin, |
| 190 | "buffer_min": in.BufferMin, |
| 191 | "notice_min": in.NoticeMin, |
| 192 | "horizon_days": in.HorizonDays, |
| 193 | "updated_at": time.Now().UTC(), |
| 194 | }) |
| 195 | if res.Error != nil { |
| 196 | return fmt.Errorf("calendar: update booking page: %w", res.Error) |
| 197 | } |
| 198 | if res.RowsAffected == 0 { |
| 199 | return ErrNotFound |
| 200 | } |
| 201 | if err := tx.Where("page_id = ?", pageID).Delete(&BookingWindow{}).Error; err != nil { |
| 202 | return fmt.Errorf("calendar: clear booking windows: %w", err) |
| 203 | } |
| 204 | return insertWindows(tx, pageID, ws) |
| 205 | }) |
| 206 | } |
| 207 | |
| 208 | // PublishBookingPage sets or clears published_at. Explicit, with its |
| 209 | // own button, because a published page is an oracle for when the host |
| 210 | // is free (spec §7.4). |
| 211 | func (s *Store) PublishBookingPage(ctx context.Context, personID, pageID int64, publish bool) error { |
| 212 | now := time.Now().UTC() |
| 213 | var at any // nil writes NULL |
| 214 | if publish { |
| 215 | at = now.Unix() |
| 216 | } |
| 217 | res := s.g.WithContext(ctx).Model(&BookingPage{}). |
| 218 | Where("id = ? AND person_id = ?", pageID, personID). |
| 219 | Updates(map[string]any{"published_at": at, "updated_at": now}) |
| 220 | if res.Error != nil { |
| 221 | return fmt.Errorf("calendar: publish booking page: %w", res.Error) |
| 222 | } |
| 223 | if res.RowsAffected == 0 { |
| 224 | return ErrNotFound |
| 225 | } |
| 226 | return nil |
| 227 | } |
| 228 | |
amadan