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+;;; SPDX-FileCopyrightText: 2026 Matthew Fennell <matthew@fennell.dev>
+;;;
+;;; SPDX-License-Identifier: AGPL-3.0-or-later
+
+(use-modules (ice-9 string-fun)
+             (json)
+             (srfi srfi-9)
+             (srfi srfi-26))
+
+(define-record-type <booking>
+  (make-booking venue activity start end)
+  booking?
+  (venue    booking-venue)
+  (activity booking-activity)
+  (start    booking-start)
+  (end      booking-end))
+
+(set-record-type-printer! <booking>
+			  (lambda (booking port)
+			    (let* ((date-str ((compose date->api-string booking-start) booking))
+				   (start-str ((compose time->api-string booking-start) booking))
+				   (end-str ((compose time->api-string booking-end) booking))
+				   (venue (booking-venue booking))
+				   (activity (booking-activity booking)))
+			      (for-each
+			       (lambda (obj) (display obj port))
+			       `(,activity "@" ,venue "@" ,date-str "T" ,start-str "-" ,end-str)))))
+
+(define (time-data->booking time)
+  (let* ((date-str-format "~Y-~m-~d ~H:~M")
+         (start-str (string-append (time-data-date time)
+                                   " "
+                                   ((compose at-time time-data-start) time)))
+         (end-str (string-append (time-data-date time)
+                                 " "
+                                 ((compose at-time time-data-end) time)))
+         (venue ((compose string->symbol time-data-venue) time))
+         (activity ((compose string->symbol time-data-activity) time))
+         (start (string->date start-str date-str-format))
+         (end (string->date end-str date-str-format)))
+    (make-booking venue activity start end)))
+
+(define (activity-name->activity-slug name)
+  (let ((string-replace-substring (lambda (from to str) (string-replace-substring str from to))))
+    ((compose string-downcase (cut string-replace-substring " " "-" <>)) name)))
+
+(define (bookings-response-data->booking data)
+  (let* ((date-str-format "~Y-~m-~d ~H:~M")
+         (date-str ((compose booking-date-raw booking-item-date bookings-response-data-item) data))
+         (start-str (string-append date-str
+                                   " "
+                                   ((compose at-time booking-item-start bookings-response-data-item) data)))
+         (end-str (string-append date-str
+                                 " "
+                                 ((compose at-time booking-item-end bookings-response-data-item) data)))
+         (venue ((compose string->symbol booking-location-venue booking-item-location bookings-response-data-item) data))
+         (activity ((compose string->symbol activity-name->activity-slug bookings-response-data-category) data))
+         (start (string->date start-str date-str-format))
+         (end (string->date end-str date-str-format)))
+    (make-booking venue activity start end)))
+
+(define-json-type <login-request>
+  (username)
+  (password))
+
+(define-json-type <login-response>
+  (token))
+
+(define-json-type <at>
+  (time "format_24_hour"))
+
+(define-json-type <time-data>
+  (venue "venue_slug")
+  (activity "category_slug")
+  (date)
+  (start "starts_at" <at>)
+  (end "ends_at" <at>)
+  (key "composite_key")
+  (spaces))
+
+(define-json-type <time-response>
+  (data "data" #(<time-data>)))
+
+(define-json-type <slot>
+  (id)
+  (restriction-ids "restriction_ids")
+  (pricing-option-id "pricing_option_id")
+  (type "cart_type")
+  (spaces))
+
+(define-json-type <slots-response>
+  (data "data" #(<slot>)))
+
+(define-json-type <add-item>
+  (id)
+  (type))
+
+(define-json-type <add-request>
+  (items "items" #(<add-item>)))
+
+(define-json-type <cart>
+  (total)
+  (item-hash "itemHash"))
+
+(define-json-type <cart-response>
+  (data "data" <cart>))
+
+(define-json-type <credits-to-reserve>
+  (amount)
+  (type))
+
+(define-json-type <apply-credits-request>
+  (cart-source "cart_source")
+  (credits-to-reserve "credits_to_reserve" #(<credits-to-reserve>))
+  (selected-user-id "selected_user_id"))
+
+(define-json-type <error-response>
+  (message))
+
+(define-json-type <payment>
+  (tender-type "tender_type")
+  (amount)
+  (info))
+
+(define-json-type <complete-request>
+  (completed-waivers "completed_waivers")
+  (payments "payments" #(<payment>))
+  (selected-user-id "selected_user_id")
+  (source)
+  (terms)
+  (item-hash "item_hash"))
+
+(define-json-type <booking-date>
+  (raw))
+
+(define-json-type <booking-location>
+  (name)
+  (venue "venue_slug"))
+
+(define-json-type <booking-item>
+  (date "date" <booking-date>)
+  (start "starts_at" <at>)
+  (end "ends_at" <at>)
+  (location "location" <booking-location>))
+
+(define-json-type <bookings-response-data>
+  (item "item" <booking-item>)
+  (category))
+
+(define-json-type <bookings-response>
+  (data "data" #(<bookings-response-data>)))