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import { unique } from "remeda";
import { z } from "zod";
import { partSchema } from "~app/utils/validation";
import type { BatchLoadContextFn } from "~web/handlers/batch";
import { queueCallFactory } from "~web/handlers/batch";
import type { AuthorizedContext } from "~web/handlers/context";
import { authProcedure } from "~web/handlers/trpc";
import {
peerIdSchema,
receiptItemIdSchema,
roleSchema,
} from "~web/handlers/validation";
import { getDuplicates } from "~web/utils/batch";
export type PayerOutput = { createdAt: Temporal.ZonedDateTime };
export const addItemPayerSchema = z.strictObject({
itemId: receiptItemIdSchema,
peerId: peerIdSchema,
part: partSchema,
});
const getData = async (
ctx: AuthorizedContext,
inputs: readonly z.infer<typeof addItemPayerSchema>[],
) => {
const [receiptParticipants, receiptItems, receiptItemPayers] =
await Promise.all([
ctx.database
.selectFrom("receiptParticipants")
.where(
"receiptParticipants.peerId",
"in",
unique(inputs.map((input) => input.peerId)),
)
.innerJoin("receipts", (qb) =>
qb.onRef("receipts.id", "=", "receiptParticipants.receiptId"),
)
.select(["receiptParticipants.peerId"])
.execute(),
ctx.database
.selectFrom("receiptItems")
.where(
"receiptItems.id",
"in",
unique(inputs.map((input) => input.itemId)),
)
.innerJoin("receipts", (qb) =>
qb.onRef("receipts.id", "=", "receiptItems.receiptId"),
)
.leftJoin("receiptParticipants", (jb) =>
jb.onRef("receipts.id", "=", "receiptParticipants.receiptId"),
)
.leftJoin("peers", (jb) =>
jb.onRef("peers.id", "=", "receiptParticipants.peerId"),
)
.leftJoin("users", (jb) =>
jb
.onRef("users.id", "=", "peers.connectedUserId")
.on("users.id", "=", ctx.auth.userId),
)
.groupBy([
"users.id",
"receipts.ownerUserId",
"receipts.id",
"receiptParticipants.role",
"receiptItems.id",
])
.select([
"users.id as selfUserId",
"receipts.ownerUserId",
"receipts.id as receiptId",
"receiptParticipants.role",
"receiptItems.id as itemId",
])
.execute(),
ctx.database
.selectFrom("receiptItemPayers")
.where((eb) =>
eb.or(
inputs.map(({ itemId, peerId }) =>
eb.and({
"receiptItemPayers.itemId": itemId,
"receiptItemPayers.peerId": peerId,
}),
),
),
)
.select([
"receiptItemPayers.part",
"receiptItemPayers.peerId",
"receiptItemPayers.itemId",
])
.execute(),
]);
return { receiptParticipants, receiptItems, receiptItemPayers };
};
const getPayersOrErrors = (
ctx: AuthorizedContext,
inputs: readonly z.infer<typeof addItemPayerSchema>[],
{
receiptItems,
receiptParticipants,
receiptItemPayers,
}: Awaited<ReturnType<typeof getData>>,
) =>
inputs.map((input) => {
const matchedReceiptItems = receiptItems.filter(
(receiptItem) => receiptItem.itemId === input.itemId,
);
const [firstReceiptItem] = matchedReceiptItems;
if (!firstReceiptItem) {
return new TRPCError({
code: "NOT_FOUND",
message: `Receipt item "${input.itemId}" does not exist.`,
});
}
const { receiptId, ownerUserId } = firstReceiptItem;
if (ownerUserId !== ctx.auth.userId) {
const selfReceiptItemRole = matchedReceiptItems.find(
(receiptItem) => receiptItem.selfUserId === ctx.auth.userId,
)?.role;
const parsed = roleSchema.safeParse(selfReceiptItemRole);
if (!parsed.success) {
return new TRPCError({
code: "PRECONDITION_FAILED",
message: `Peer "${input.peerId}" doesn't participate in receipt "${receiptId}".`,
});
}
const accessRole = parsed.data;
if (accessRole !== "owner" && accessRole !== "editor") {
return new TRPCError({
code: "FORBIDDEN",
message: `Not enough rights to add item to receipt "${receiptId}".`,
});
}
}
const matchedReceiptItemPayer = receiptItemPayers.find(
({ peerId, itemId }) =>
peerId === input.peerId && itemId === input.itemId,
);
if (matchedReceiptItemPayer) {
return new TRPCError({
code: "CONFLICT",
message: `Peer "${input.peerId}" already pays for item "${input.itemId}".`,
});
}
const matchedPeer = receiptParticipants.find(
(receiptParticipant) => receiptParticipant.peerId === input.peerId,
);
if (!matchedPeer) {
return new TRPCError({
code: "PRECONDITION_FAILED",
message: `Peer "${input.peerId}" doesn't participate in receipt "${receiptId}".`,
});
}
return {
peerId: input.peerId,
itemId: input.itemId,
part: input.part.toString(),
};
});
const insertPayers = async (
ctx: AuthorizedContext,
payers: Exclude<ReturnType<typeof getPayersOrErrors>[number], TRPCError>[],
) => {
if (payers.length === 0) {
return [];
}
return ctx.database
.insertInto("receiptItemPayers")
.values(payers)
.returning([
"receiptItemPayers.createdAt",
"receiptItemPayers.itemId",
"receiptItemPayers.peerId",
])
.execute();
};
export const batchFn: BatchLoadContextFn<
AuthorizedContext,
z.infer<typeof addItemPayerSchema>,
PayerOutput,
TRPCError
> = (ctx) => async (inputs) => {
const duplicatedTuples = getDuplicates(
inputs,
({ itemId, peerId }) => [itemId, peerId] as const,
);
if (duplicatedTuples.length !== 0) {
throw new TRPCError({
code: "CONFLICT",
message: `Expected to have unique pair of item id and peer id, got repeating pairs: ${duplicatedTuples
.map(
([[itemId, peerId], count]) =>
`item "${itemId}" / peer "${peerId}" (${count} times)`,
)
.join(", ")}.`,
});
}
const data = await getData(ctx, inputs);
const payersOrErrors = getPayersOrErrors(ctx, inputs, data);
const insertedPayer = await insertPayers(
ctx,
payersOrErrors.filter(
(payerOrError): payerOrError is Exclude<typeof payerOrError, TRPCError> =>
!(payerOrError instanceof TRPCError),
),
);
return payersOrErrors.map((itemOrError) => {
if (itemOrError instanceof TRPCError) {
return itemOrError;
}
const matchedPayer = insertedPayer.find(
(payer) =>
payer.itemId === itemOrError.itemId &&
payer.peerId === itemOrError.peerId,
);
/* c8 ignore start */
if (!matchedPayer) {
return new TRPCError({
code: "INTERNAL_SERVER_ERROR",
message: `Expected to have a matched item payer in list of inserted rows for item id "${itemOrError.itemId}" and peer id "${itemOrError.peerId}".`,
});
}
/* c8 ignore stop */
return { createdAt: matchedPayer.createdAt };
});
};
export const procedure = authProcedure
.meta({
title: "Add receipt item payer",
description:
"Assigns a participating peerId as a payer of a given receipt item with a given part share.",
})
.input(addItemPayerSchema)
.mutation(queueCallFactory(batchFn));
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