feat(dashboard): list sources with statistics

packages/db/src/constants.ts

@@ -8,7 +8,18 @@ export const SOURCE_IMAGE_BASE = "https://devscast.org/images/sources/";
  * Number of days to include in the publication graph for sources.
  * This defines the time range for which publication data is aggregated and displayed.
  */
-export const PUBLICATION_GRAPH_DAYS = 180;
+export const PUBLICATION_GRAPH_DAYS = 60;
+
+/**
+ * Maximum number of category shares to return for a source.
+ * This limits the number of categories displayed in the category share breakdown.
+ */
+export const CATEGORY_SHARES_LIMIT = 10;
+
+/**
+ * The default timezone
+ */
+export const TIMEZONE = "Africa/Lubumbashi";
 
 /**
  * Default pagination settings.

packages/db/src/queries/sources.ts

@@ -1,12 +1,24 @@
-import { eq } from "drizzle-orm";
+import { endOfDay, startOfDay, subDays } from "date-fns";
+import { eq, sql } from "drizzle-orm";
 import { v7 as uuidV7 } from "uuid";
 
 import { Database } from "@/client";
+import { CATEGORY_SHARES_LIMIT, PUBLICATION_GRAPH_DAYS, TIMEZONE } from "@/constants";
 import { NotFoundError } from "@/errors";
-import { Credibility, source } from "@/schema";
+import { Credibility, article, source } from "@/schema";
 
 export async function getSources(db: Database) {
-  return db.query.source.findMany();
+  const rows = await db.query.source.findMany();
+
+  const data = await Promise.all(
+    rows.map(async (it) => ({
+      ...it,
+      categoryShares: await getCategoryShares(db, it.id),
+      publicationGraph: await getPublicationGraph(db, it.id),
+    })),
+  );
+
+  return data;
 }
 
 export type CreateSourceParams = {
@@ -69,10 +81,20 @@ export async function getSourceByName(db: Database, name: string) {
   });
 }
 
-export async function getById(db: Database, id: string) {
-  return db.query.source.findFirst({
+export async function getSourceById(db: Database, id: string) {
+  const item = db.query.source.findFirst({
     where: eq(source.id, id),
   });
+
+  if (item === undefined) {
+    throw new NotFoundError("Source not found");
+  }
+
+  return {
+    ...item,
+    categoryShares: await getCategoryShares(db, id),
+    publicationGraph: await getPublicationGraph(db, id),
+  };
 }
 
 export async function getSourceIdByName(db: Database, name: string): Promise<string> {
@@ -84,7 +106,7 @@ export async function getSourceIdByName(db: Database, name: string): Promise<str
   });
 
   if (!result) {
-    throw new NotFoundError(`Source with name "${name}" not found`);
+    throw new NotFoundError("Source not found");
   }
 
   return result.id;
@@ -94,8 +116,88 @@ export type GetSourceByIdParams = {
   id: string;
 };
 
-export async function getSourceById(db: Database, params: GetSourceByIdParams) {
-  return db.query.source.findFirst({
-    where: eq(source.id, params.id),
-  });
+export type PublicationEntry = {
+  date: string;
+  count: number;
+};
+
+export type PublicationGraph = {
+  items: PublicationEntry[];
+  total: number;
+};
+
+export type CategoryShare = {
+  category: string;
+  count: number;
+  percentage: number;
+};
+
+export type CategoryShares = {
+  items: CategoryShare[];
+  total: number;
+};
+
+export async function getPublicationGraph(
+  db: Database,
+  id: string,
+  days: number = PUBLICATION_GRAPH_DAYS,
+): Promise<PublicationGraph> {
+  const endDate = endOfDay(new Date());
+  const startDate = startOfDay(subDays(endDate, days - 1));
+
+  const data = await db.execute<{ date: string; count: number }>(sql`
+    WITH bounds AS (
+      SELECT
+        ${startDate}::timestamptz AS start_ts,
+        ${endDate}::timestamptz   AS end_ts
+    ),
+    series AS (
+      SELECT (gs)::date AS d
+      FROM bounds b,
+      LATERAL generate_series(
+        date_trunc('day', timezone(${TIMEZONE}, b.start_ts)),
+        date_trunc('day', timezone(${TIMEZONE}, b.end_ts)),
+        INTERVAL '1 day'
+      ) AS gs
+    ),
+    counts AS (
+      SELECT
+        a.published_at::date AS d,
+        COUNT(*)::int        AS c
+      FROM article a, bounds b
+      WHERE a.source_id = ${id}::uuid
+        AND a.published_at >= timezone(${TIMEZONE}, b.start_ts)
+        AND a.published_at <= timezone(${TIMEZONE}, b.end_ts)
+      GROUP BY 1
+    )
+    SELECT
+      to_char(s.d, 'YYYY-MM-DD') AS date,
+      COALESCE(c.c, 0)           AS count
+    FROM series s
+    LEFT JOIN counts c USING (d)
+    ORDER BY s.d ASC
+  `);
+
+  return { items: data.rows, total: data.rows.length };
+}
+
+async function getCategoryShares(db: Database, id: string): Promise<CategoryShares> {
+  const data = await db.execute<CategoryShare>(sql`
+    SELECT
+      cat AS category,
+      COUNT(*)::int AS count,
+      ROUND((COUNT(*)::numeric / SUM(COUNT(*)) OVER ()) * 100, 2) AS percentage
+    FROM (
+      SELECT NULLIF(BTRIM(c), '') AS cat
+      FROM ${article}
+      CROSS JOIN LATERAL UNNEST(COALESCE(${article.categories}, ARRAY[]::text[])) AS c
+      WHERE ${article.sourceId} = ${id}
+    ) t
+    WHERE cat IS NOT NULL
+    GROUP BY cat
+    ORDER BY count DESC
+    LIMIT ${CATEGORY_SHARES_LIMIT}
+  `);
+
+  return { items: data.rows, total: data.rowCount ?? 0 };
 }