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import type { ExpressionBuilder } from "kysely";
import { sql } from "kysely";
import { jsonArrayFrom } from "kysely/helpers/postgres";
import { z } from "zod";
import {
limitSchema,
offsetSchema,
receiptsFiltersSchema,
receiptsOrderBySchema,
} from "~app/utils/validation";
import type { ReceiptId, ReceiptItemId } from "~db/ids";
import type { DB } from "~db/types.gen";
import type { Interval } from "~utils/array";
import { mergeIntervals } from "~utils/array";
import {
SIMILARTY_THRESHOLD,
trigramSimilarity,
trigramsForString,
} from "~utils/server/trigram";
import { queueCallFactory } from "~web/handlers/batch";
import type { AuthorizedContext } from "~web/handlers/context";
import {
getOwnReceipts,
getParticipantsReceipts,
} from "~web/handlers/receipts/utils";
import { authProcedure } from "~web/handlers/trpc";
import type { GeneralOutput } from "~web/utils/batch";
import { queueList } from "~web/utils/batch";
const inputSchema = z.strictObject({
cursor: offsetSchema,
limit: limitSchema,
orderBy: receiptsOrderBySchema,
filters: receiptsFiltersSchema.optional(),
});
type Input = z.infer<typeof inputSchema>;
type OutputItem = {
id: ReceiptId;
highlights: Interval[];
matchedItems: {
id: ReceiptItemId;
highlights: Interval[];
}[];
};
type Output = GeneralOutput<OutputItem> & { count: number };
const getTrigramHighlight = ({
query,
target,
}: {
query: string;
target: string;
}) => {
const words = target.split(" ").map((word, index, allWords) => ({
word,
startIndex:
/* c8 ignore next */
allWords.slice(0, index).join(" ").length + (index === 0 ? 0 : 1),
}));
return mergeIntervals(
words.flatMap(({ word, startIndex }) => {
if (
query
.split(" ")
.every(
(queryPart) =>
trigramSimilarity(queryPart, word) < SIMILARTY_THRESHOLD,
)
) {
return [];
}
const filterQueryTrigrams = Array.from(trigramsForString(query))
.map((trigram) => trigram.trim())
.filter((trigram) => trigram.length >= 3)
.map((trigram) => RegExp.escape(trigram));
/* c8 ignore start */
if (filterQueryTrigrams.length === 0) {
return [];
}
/* c8 ignore stop */
const matches = [
...word.matchAll(
new RegExp(`(?=(${filterQueryTrigrams.join("|")}))`, "giu"),
),
];
return matches.map<Interval>((match) => [
startIndex + match.index,
// This is non-consuming RegExp hence 2nd argument
// oxlint-disable-next-line typescript/no-non-null-assertion
startIndex + match.index + match[1]!.length,
]);
}),
true,
);
};
const itemSimilarity = (query: string, lookupColumn: string) =>
sql<number>`similarity(${query}, ${sql.id(...lookupColumn.split("."))})`;
const selectFields = (
eb: ExpressionBuilder<DB, "receipts" | "receiptItems">,
query: string | undefined,
) => {
if (!query) {
return [
sql<number>`0`.as("similarity"),
sql`'[]'::jsonb`.$castTo<Item[]>().as("matchedItems"),
] as const;
}
const itemsQueryBuilder = eb
.selectFrom("receiptItems")
.select([
"receiptItems.id",
"receiptItems.name",
itemSimilarity(query, "receiptItems.name").as("similarity"),
])
.whereRef("receiptItems.receiptId", "=", "receipts.id")
.where((qb) =>
qb(itemSimilarity(query, "receiptItems.name"), ">=", SIMILARTY_THRESHOLD),
)
.orderBy(itemSimilarity(query, "receiptItems.name"), "desc");
type Item = NonNullable<(typeof itemsQueryBuilder)["expressionType"]>;
const nameSimilarity = itemSimilarity(query, "receipts.name");
const maxItemSimilarity = sql<number>`coalesce(${eb.fn.max(itemSimilarity(query, "receiptItems.name"))}, 0::float8)`;
return [
sql<number>`(${nameSimilarity} + ${maxItemSimilarity})`.as("similarity"),
jsonArrayFrom(itemsQueryBuilder).$castTo<Item[]>().as("matchedItems"),
] as const;
};
const fetchPage = async (
{ database, auth }: AuthorizedContext,
input: Input,
) => {
const foreignReceipts = getParticipantsReceipts(database, auth.userId);
const ownReceipts = getOwnReceipts(database, auth.userId);
const mergedReceipts = database
.with("mergedReceipts", () => {
const query = input.filters?.query;
const baseGroupBy = [
"receipts.id",
"receipts.name",
"receipts.issued",
] as const;
const baseSelect = [
"receipts.id",
"receipts.name",
"receipts.issued",
] as const;
const ownBuilder = ownReceipts
.leftJoin("receiptItems", (qb) =>
qb.onRef("receiptItems.receiptId", "=", "receipts.id"),
)
.select((eb) => [...baseSelect, ...selectFields(eb, query)])
.groupBy(baseGroupBy);
const foreignBuilder = foreignReceipts
.leftJoin("receiptItems", (qb) =>
qb.onRef("receiptItems.receiptId", "=", "receipts.id"),
)
.select((eb) => [...baseSelect, ...selectFields(eb, query)])
.groupBy(baseGroupBy);
if (!input.filters || typeof input.filters.ownedByMe !== "boolean") {
return ownBuilder.unionAll(foreignBuilder);
}
if (input.filters.ownedByMe) {
return ownBuilder;
}
return foreignBuilder;
})
.selectFrom("mergedReceipts")
.$if(Boolean(input.filters?.query), (sqb) =>
sqb.where("mergedReceipts.similarity", ">=", SIMILARTY_THRESHOLD),
);
const [receipts, receiptsCount] = await Promise.all([
mergedReceipts
.select(["id", "name", "matchedItems", "similarity"])
.orderBy("mergedReceipts.similarity", "desc")
// Stable order for receipts with the same date
.orderBy(
"mergedReceipts.issued",
input.orderBy === "date-asc" ? "asc" : "desc",
)
.orderBy("mergedReceipts.id")
.offset(input.cursor)
.limit(input.limit)
.execute(),
mergedReceipts
.select((eb) => eb.fn.count<number>("mergedReceipts.id").as("amount"))
.executeTakeFirstOrThrow(
/* c8 ignore start */
() =>
new TRPCError({
code: "INTERNAL_SERVER_ERROR",
message: `Unexpected having empty "amount" in "receipts.getPaged" handler`,
}),
/* c8 ignore stop */
),
]);
return {
count: receiptsCount.amount,
cursor: input.cursor,
items: receipts.map(({ id, name, matchedItems }) => ({
id,
highlights: input.filters?.query
? getTrigramHighlight({ query: input.filters.query, target: name })
: [],
matchedItems: matchedItems.map((item) => ({
id: item.id,
highlights: input.filters?.query
? getTrigramHighlight({
query: input.filters.query,
target: item.name,
/* c8 ignore start */
})
: [],
/* c8 ignore stop */
})),
})),
};
};
const queueReceiptList = queueCallFactory<AuthorizedContext, Input, Output>(
(ctx) => async (inputs) =>
queueList<Input, OutputItem, Output>(inputs, (values) =>
fetchPage(ctx, values),
),
);
export const procedure = authProcedure
.meta({
title: "Get receipts, paged",
description:
"Returns a page of the user's own and participated-in receipts, optionally filtered by a fuzzy name/item search query.",
})
.input(inputSchema)
.query(queueReceiptList);
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