From 27f0dc0833356d41e0a046d4f900e0274733401b Mon Sep 17 00:00:00 2001
From: Julian Weng <julian.weng.us@gmail.com>
Date: Thu, 10 Oct 2024 18:25:25 -0400
Subject: [PATCH] Disable editing ticket count in cart while waiting for server
 response for previous edit, propogate unsuccessful edit attempts to form
 state, clarify date range shorthand in ticket card

---
 frontend/components/Tickets/CartTickets.tsx | 40 ++++++++++++++++-----
 frontend/components/Tickets/TicketCard.tsx  | 18 ++++++----
 2 files changed, 42 insertions(+), 16 deletions(-)

diff --git a/frontend/components/Tickets/CartTickets.tsx b/frontend/components/Tickets/CartTickets.tsx
index edab5ce80..5020ad192 100644
--- a/frontend/components/Tickets/CartTickets.tsx
+++ b/frontend/components/Tickets/CartTickets.tsx
@@ -114,13 +114,14 @@ export interface CartTicketsProps {
  * @param tickets - Original array of tickets
  * @returns Array of tickets condensed into unique types
  */
-const combineTickets = (tickets: EventTicket[]): CountedEventTicket[] =>
+const combineTickets = (tickets: EventTicket[]): CountedEventTicketStatus[] =>
   Object.values(
     tickets.reduce(
       (acc, ticket) => ({
         ...acc,
         [`${ticket.event.id}_${ticket.type}`]: {
           ...ticket,
+          pendingEdit: false,
           count: (acc[`${ticket.event.id}_${ticket.type}`]?.count ?? 0) + 1,
         },
       }),
@@ -182,12 +183,17 @@ const useCheckout = (paid: boolean) => {
   }
 }
 
+interface CountedEventTicketStatus extends CountedEventTicket {
+  pendingEdit: boolean
+}
+
 const CartTickets: React.FC<CartTicketsProps> = ({ tickets, soldOut }) => {
   const navigate = useRouter()
-  const [removeModal, setRemoveModal] = useState<CountedEventTicket | null>(
-    null,
-  )
-  const [countedTickets, setCountedTickets] = useState<CountedEventTicket[]>([])
+  const [removeModal, setRemoveModal] =
+    useState<CountedEventTicketStatus | null>(null)
+  const [countedTickets, setCountedTickets] = useState<
+    CountedEventTicketStatus[]
+  >([])
 
   const atLeastOnePaid = tickets.some((ticket) => parseFloat(ticket.price) > 0)
   const {
@@ -225,12 +231,25 @@ const CartTickets: React.FC<CartTicketsProps> = ({ tickets, soldOut }) => {
     checkout()
   }
 
-  function handleUpdateTicket(ticket: CountedEventTicket, newCount?: number) {
+  function handleUpdateTicket(
+    ticket: CountedEventTicketStatus,
+    newCount?: number,
+    propogateCount?: (count: number) => void,
+  ) {
     let reqPromise
 
     if (!ticket.count || newCount === ticket.count) {
       return
     }
+
+    function flipPendingEdit(value: boolean) {
+      setCountedTickets(
+        countedTickets.map((t) =>
+          t.id === ticket.id ? { ...t, pendingEdit: value } : t,
+        ),
+      )
+    }
+    flipPendingEdit(true)
     if (newCount && newCount > ticket.count) {
       reqPromise = doApiRequest(`/events/${ticket.event.id}/add_to_cart/`, {
         method: 'POST',
@@ -268,8 +287,11 @@ const CartTickets: React.FC<CartTicketsProps> = ({ tickets, soldOut }) => {
           toast.error(res.detail, {
             style: { color: WHITE },
           })
+          propogateCount?.(ticket.count ?? 0)
+          flipPendingEdit(false)
           return
         }
+        flipPendingEdit(false)
         toast.success(res.detail)
         // TODO: a less naive approach to updating the cart
         setCountedTickets(
@@ -365,9 +387,9 @@ const CartTickets: React.FC<CartTicketsProps> = ({ tickets, soldOut }) => {
               ticket={ticket}
               hideActions
               removable
-              editable
-              onChange={(count) => {
-                handleUpdateTicket(ticket, count)
+              editable={!ticket.pendingEdit}
+              onChange={(count, propogateCount) => {
+                handleUpdateTicket(ticket, count, propogateCount)
               }}
               onRemove={() => {
                 setRemoveModal(ticket)
diff --git a/frontend/components/Tickets/TicketCard.tsx b/frontend/components/Tickets/TicketCard.tsx
index 2d88b6337..1986c919a 100644
--- a/frontend/components/Tickets/TicketCard.tsx
+++ b/frontend/components/Tickets/TicketCard.tsx
@@ -132,7 +132,8 @@ export const TicketCard = ({
   indexProps?: TicketCardIndexProps
 
   onRemove?: () => void
-  onChange?: (count: number) => void
+  // Optimistically update the ticket count but revert if server request fails
+  onChange?: (count: number, propogateCount: (number) => void) => void
   onClick?: () => void
 
   viewModal?: (type: ModalType) => void
@@ -196,7 +197,10 @@ export const TicketCard = ({
                 onKeyDown={(e) => {
                   if (e.key === 'Enter') {
                     setIsEditMode(false)
-                    onChange?.(parseInt(e.currentTarget.value ?? ticket.count))
+                    onChange?.(
+                      parseInt(e.currentTarget.value ?? ticket.count),
+                      setTicketCount,
+                    )
                   }
                 }}
               />
@@ -256,12 +260,12 @@ export const TicketCard = ({
                 css={css`
                   font-size: 12px;
                   position: absolute;
-                  right: 12px;
-                  top: 12px;
+                  right: 8px;
+                  top: 8px;
                 `}
               >
-                {datetimeData.dayDuration < 0 ? '-' : '+'}{' '}
-                {Math.abs(datetimeData.dayDuration)}
+                {datetimeData.dayDuration < 0 ? '-' : '+'}
+                {Math.abs(datetimeData.dayDuration)}d
               </div>
             )}
           </Title>
@@ -318,7 +322,7 @@ export const TicketCard = ({
           `}
           onClick={() => {
             if (isEditMode) {
-              onChange?.(ticketCount || ticket.count!)
+              onChange?.(ticketCount || ticket.count!, setTicketCount)
             }
             setIsEditMode(!isEditMode)
           }}