feat: add day/week/month period toggle for dashboard line charts

Add a period selector (day, week, month) to the reading activity and
books added charts. The API now accepts a ?period= query param and
returns gap-filled data using generate_series so all time slots appear
even with zero values. Labels are locale-aware (short month, weekday).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/api/src/stats.rs

@@ -1,10 +1,19 @@
-use axum::{extract::State, Json};
+use axum::{
-use serde::Serialize;
+    extract::{Query, State},
+    Json,
+};
+use serde::{Deserialize, Serialize};
 use sqlx::Row;
-use utoipa::ToSchema;
+use utoipa::{IntoParams, ToSchema};
 
 use crate::{error::ApiError, state::AppState};
 
+#[derive(Deserialize, IntoParams)]
+pub struct StatsQuery {
+    /// Granularity: "day", "week" or "month" (default: "month")
+    pub period: Option<String>,
+}
+
 #[derive(Serialize, ToSchema)]
 pub struct StatsOverview {
     pub total_books: i64,
@@ -117,6 +126,7 @@ pub struct StatsResponse {
     get,
     path = "/stats",
     tag = "stats",
+    params(StatsQuery),
     responses(
         (status = 200, body = StatsResponse),
         (status = 401, description = "Unauthorized"),
@@ -125,7 +135,9 @@ pub struct StatsResponse {
 )]
 pub async fn get_stats(
     State(state): State<AppState>,
+    Query(query): Query<StatsQuery>,
 ) -> Result<Json<StatsResponse>, ApiError> {
+    let period = query.period.as_deref().unwrap_or("month");
     // Overview + reading status in one query
     let overview_row = sqlx::query(
         r#"
@@ -285,20 +297,74 @@ pub async fn get_stats(
         })
         .collect();
 
-    // Additions over time (last 12 months)
+    // Additions over time (with gap filling)
-    let additions_rows = sqlx::query(
+    let additions_rows = match period {
+        "day" => {
+            sqlx::query(
                 r#"
                 SELECT
-            TO_CHAR(DATE_TRUNC('month', created_at), 'YYYY-MM') AS month,
+                    TO_CHAR(d.dt, 'YYYY-MM-DD') AS month,
-            COUNT(*) AS books_added
+                    COALESCE(cnt.books_added, 0) AS books_added
+                FROM generate_series(CURRENT_DATE - INTERVAL '6 days', CURRENT_DATE, '1 day') AS d(dt)
+                LEFT JOIN (
+                    SELECT created_at::date AS dt, COUNT(*) AS books_added
                     FROM books
-        WHERE created_at >= DATE_TRUNC('month', NOW()) - INTERVAL '11 months'
+                    WHERE created_at >= CURRENT_DATE - INTERVAL '6 days'
-        GROUP BY DATE_TRUNC('month', created_at)
+                    GROUP BY created_at::date
+                ) cnt ON cnt.dt = d.dt
                 ORDER BY month ASC
                 "#,
             )
             .fetch_all(&state.pool)
-    .await?;
+            .await?
+        }
+        "week" => {
+            sqlx::query(
+                r#"
+                SELECT
+                    TO_CHAR(d.dt, 'YYYY-MM-DD') AS month,
+                    COALESCE(cnt.books_added, 0) AS books_added
+                FROM generate_series(
+                    DATE_TRUNC('week', NOW() - INTERVAL '2 months'),
+                    DATE_TRUNC('week', NOW()),
+                    '1 week'
+                ) AS d(dt)
+                LEFT JOIN (
+                    SELECT DATE_TRUNC('week', created_at) AS dt, COUNT(*) AS books_added
+                    FROM books
+                    WHERE created_at >= DATE_TRUNC('week', NOW() - INTERVAL '2 months')
+                    GROUP BY DATE_TRUNC('week', created_at)
+                ) cnt ON cnt.dt = d.dt
+                ORDER BY month ASC
+                "#,
+            )
+            .fetch_all(&state.pool)
+            .await?
+        }
+        _ => {
+            sqlx::query(
+                r#"
+                SELECT
+                    TO_CHAR(d.dt, 'YYYY-MM') AS month,
+                    COALESCE(cnt.books_added, 0) AS books_added
+                FROM generate_series(
+                    DATE_TRUNC('month', NOW()) - INTERVAL '11 months',
+                    DATE_TRUNC('month', NOW()),
+                    '1 month'
+                ) AS d(dt)
+                LEFT JOIN (
+                    SELECT DATE_TRUNC('month', created_at) AS dt, COUNT(*) AS books_added
+                    FROM books
+                    WHERE created_at >= DATE_TRUNC('month', NOW()) - INTERVAL '11 months'
+                    GROUP BY DATE_TRUNC('month', created_at)
+                ) cnt ON cnt.dt = d.dt
+                ORDER BY month ASC
+                "#,
+            )
+            .fetch_all(&state.pool)
+            .await?
+        }
+    };
 
     let additions_over_time: Vec<MonthlyAdditions> = additions_rows
         .iter()
@@ -409,21 +475,77 @@ pub async fn get_stats(
         })
         .collect();
 
-    // Reading activity over time (last 12 months)
+    // Reading activity over time (with gap filling)
-    let reading_time_rows = sqlx::query(
+    let reading_time_rows = match period {
+        "day" => {
+            sqlx::query(
                 r#"
                 SELECT
-            TO_CHAR(DATE_TRUNC('month', brp.last_read_at), 'YYYY-MM') AS month,
+                    TO_CHAR(d.dt, 'YYYY-MM-DD') AS month,
-            COUNT(*) AS books_read
+                    COALESCE(cnt.books_read, 0) AS books_read
+                FROM generate_series(CURRENT_DATE - INTERVAL '6 days', CURRENT_DATE, '1 day') AS d(dt)
+                LEFT JOIN (
+                    SELECT brp.last_read_at::date AS dt, COUNT(*) AS books_read
                     FROM book_reading_progress brp
                     WHERE brp.status = 'read'
-          AND brp.last_read_at >= DATE_TRUNC('month', NOW()) - INTERVAL '11 months'
+                      AND brp.last_read_at >= CURRENT_DATE - INTERVAL '6 days'
-        GROUP BY DATE_TRUNC('month', brp.last_read_at)
+                    GROUP BY brp.last_read_at::date
+                ) cnt ON cnt.dt = d.dt
                 ORDER BY month ASC
                 "#,
             )
             .fetch_all(&state.pool)
-    .await?;
+            .await?
+        }
+        "week" => {
+            sqlx::query(
+                r#"
+                SELECT
+                    TO_CHAR(d.dt, 'YYYY-MM-DD') AS month,
+                    COALESCE(cnt.books_read, 0) AS books_read
+                FROM generate_series(
+                    DATE_TRUNC('week', NOW() - INTERVAL '2 months'),
+                    DATE_TRUNC('week', NOW()),
+                    '1 week'
+                ) AS d(dt)
+                LEFT JOIN (
+                    SELECT DATE_TRUNC('week', brp.last_read_at) AS dt, COUNT(*) AS books_read
+                    FROM book_reading_progress brp
+                    WHERE brp.status = 'read'
+                      AND brp.last_read_at >= DATE_TRUNC('week', NOW() - INTERVAL '2 months')
+                    GROUP BY DATE_TRUNC('week', brp.last_read_at)
+                ) cnt ON cnt.dt = d.dt
+                ORDER BY month ASC
+                "#,
+            )
+            .fetch_all(&state.pool)
+            .await?
+        }
+        _ => {
+            sqlx::query(
+                r#"
+                SELECT
+                    TO_CHAR(d.dt, 'YYYY-MM') AS month,
+                    COALESCE(cnt.books_read, 0) AS books_read
+                FROM generate_series(
+                    DATE_TRUNC('month', NOW()) - INTERVAL '11 months',
+                    DATE_TRUNC('month', NOW()),
+                    '1 month'
+                ) AS d(dt)
+                LEFT JOIN (
+                    SELECT DATE_TRUNC('month', brp.last_read_at) AS dt, COUNT(*) AS books_read
+                    FROM book_reading_progress brp
+                    WHERE brp.status = 'read'
+                      AND brp.last_read_at >= DATE_TRUNC('month', NOW()) - INTERVAL '11 months'
+                    GROUP BY DATE_TRUNC('month', brp.last_read_at)
+                ) cnt ON cnt.dt = d.dt
+                ORDER BY month ASC
+                "#,
+            )
+            .fetch_all(&state.pool)
+            .await?
+        }
+    };
 
     let reading_over_time: Vec<MonthlyReading> = reading_time_rows
         .iter()

apps/backoffice/app/components/PeriodToggle.tsx

@@ -0,0 +1,47 @@
+"use client";
+
+import { useRouter, useSearchParams } from "next/navigation";
+
+type Period = "day" | "week" | "month";
+
+export function PeriodToggle({
+  labels,
+}: {
+  labels: { day: string; week: string; month: string };
+}) {
+  const router = useRouter();
+  const searchParams = useSearchParams();
+  const raw = searchParams.get("period");
+  const current: Period = raw === "day" ? "day" : raw === "week" ? "week" : "month";
+
+  function setPeriod(period: Period) {
+    const params = new URLSearchParams(searchParams.toString());
+    if (period === "month") {
+      params.delete("period");
+    } else {
+      params.set("period", period);
+    }
+    const qs = params.toString();
+    router.push(qs ? `?${qs}` : "/", { scroll: false });
+  }
+
+  const options: Period[] = ["day", "week", "month"];
+
+  return (
+    <div className="flex gap-1 bg-muted rounded-lg p-0.5">
+      {options.map((p) => (
+        <button
+          key={p}
+          onClick={() => setPeriod(p)}
+          className={`px-2.5 py-1 text-xs font-medium rounded-md transition-colors ${
+            current === p
+              ? "bg-card text-foreground shadow-sm"
+              : "text-muted-foreground hover:text-foreground"
+          }`}
+        >
+          {labels[p]}
+        </button>
+      ))}
+    </div>
+  );
+}

apps/backoffice/app/page.tsx

@@ -2,6 +2,7 @@ import React from "react";
 import { fetchStats, StatsResponse, getBookCoverUrl } from "../lib/api";
 import { Card, CardContent, CardHeader, CardTitle } from "./components/ui";
 import { RcDonutChart, RcBarChart, RcAreaChart, RcStackedBar, RcHorizontalBar } from "./components/DashboardCharts";
+import { PeriodToggle } from "./components/PeriodToggle";
 import Image from "next/image";
 import Link from "next/link";
 import { getServerTranslations } from "../lib/i18n/server";
@@ -21,6 +22,24 @@ function formatNumber(n: number, locale: string): string {
   return n.toLocaleString(locale === "fr" ? "fr-FR" : "en-US");
 }
 
+function formatChartLabel(raw: string, period: "day" | "week" | "month", locale: string): string {
+  const loc = locale === "fr" ? "fr-FR" : "en-US";
+  if (period === "month") {
+    // raw = "YYYY-MM"
+    const [y, m] = raw.split("-");
+    const d = new Date(Number(y), Number(m) - 1, 1);
+    return d.toLocaleDateString(loc, { month: "short" });
+  }
+  if (period === "week") {
+    // raw = "YYYY-MM-DD" (Monday of the week)
+    const d = new Date(raw + "T00:00:00");
+    return d.toLocaleDateString(loc, { day: "numeric", month: "short" });
+  }
+  // day: raw = "YYYY-MM-DD"
+  const d = new Date(raw + "T00:00:00");
+  return d.toLocaleDateString(loc, { weekday: "short", day: "numeric" });
+}
+
 // Horizontal progress bar for metadata quality (stays server-rendered, no recharts needed)
 function HorizontalBar({ label, value, max, subLabel, color = "var(--color-primary)" }: { label: string; value: number; max: number; subLabel?: string; color?: string }) {
   const pct = max > 0 ? (value / max) * 100 : 0;
@@ -40,12 +59,19 @@ function HorizontalBar({ label, value, max, subLabel, color = "var(--color-prima
   );
 }
 
-export default async function DashboardPage() {
+export default async function DashboardPage({
+  searchParams,
+}: {
+  searchParams: Promise<{ [key: string]: string | string[] | undefined }>;
+}) {
+  const searchParamsAwaited = await searchParams;
+  const rawPeriod = searchParamsAwaited.period;
+  const period = rawPeriod === "day" ? "day" as const : rawPeriod === "week" ? "week" as const : "month" as const;
   const { t, locale } = await getServerTranslations();
 
   let stats: StatsResponse | null = null;
   try {
-    stats = await fetchStats();
+    stats = await fetchStats(period);
   } catch (e) {
     console.error("Failed to fetch stats:", e);
   }
@@ -175,20 +201,19 @@ export default async function DashboardPage() {
       )}
 
       {/* Reading activity line chart */}
-      {reading_over_time.length > 0 && (
       <Card hover={false}>
-          <CardHeader>
+        <CardHeader className="flex flex-row items-center justify-between space-y-0">
           <CardTitle className="text-base">{t("dashboard.readingActivity")}</CardTitle>
+          <PeriodToggle labels={{ day: t("dashboard.periodDay"), week: t("dashboard.periodWeek"), month: t("dashboard.periodMonth") }} />
         </CardHeader>
         <CardContent>
           <RcAreaChart
             noDataLabel={noDataLabel}
-              data={reading_over_time.map((m) => ({ label: m.month.slice(5), value: m.books_read }))}
+            data={reading_over_time.map((m) => ({ label: formatChartLabel(m.month, period, locale), value: m.books_read }))}
             color="hsl(142 60% 45%)"
           />
         </CardContent>
       </Card>
-      )}
 
       {/* Charts row */}
       <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
@@ -351,15 +376,16 @@ export default async function DashboardPage() {
         </Card>
       </div>
 
-      {/* Monthly additions line chart – full width */}
+      {/* Additions line chart – full width */}
       <Card hover={false}>
-        <CardHeader>
+        <CardHeader className="flex flex-row items-center justify-between space-y-0">
           <CardTitle className="text-base">{t("dashboard.booksAdded")}</CardTitle>
+          <PeriodToggle labels={{ day: t("dashboard.periodDay"), week: t("dashboard.periodWeek"), month: t("dashboard.periodMonth") }} />
         </CardHeader>
         <CardContent>
           <RcAreaChart
             noDataLabel={noDataLabel}
-            data={additions_over_time.map((m) => ({ label: m.month.slice(5), value: m.books_added }))}
+            data={additions_over_time.map((m) => ({ label: formatChartLabel(m.month, period, locale), value: m.books_added }))}
             color="hsl(198 78% 37%)"
           />
         </CardContent>

apps/backoffice/lib/api.ts

@@ -584,8 +584,9 @@ export type StatsResponse = {
   metadata: MetadataStats;
 };
 
-export async function fetchStats() {
+export async function fetchStats(period?: "day" | "week" | "month") {
-  return apiFetch<StatsResponse>("/stats", { next: { revalidate: 30 } });
+  const params = period && period !== "month" ? `?period=${period}` : "";
+  return apiFetch<StatsResponse>(`/stats${params}`, { next: { revalidate: 30 } });
 }
 
 // ---------------------------------------------------------------------------

apps/backoffice/lib/i18n/en.ts

@@ -70,7 +70,10 @@ const en: Record<TranslationKey, string> = {
   "dashboard.readingStatus": "Reading status",
   "dashboard.byFormat": "By format",
   "dashboard.byLibrary": "By library",
-  "dashboard.booksAdded": "Books added (last 12 months)",
+  "dashboard.booksAdded": "Books added",
+  "dashboard.periodDay": "Day",
+  "dashboard.periodWeek": "Week",
+  "dashboard.periodMonth": "Month",
   "dashboard.popularSeries": "Popular series",
   "dashboard.noSeries": "No series yet",
   "dashboard.unknown": "Unknown",
@@ -84,7 +87,7 @@ const en: Record<TranslationKey, string> = {
   "dashboard.withIsbn": "With ISBN",
   "dashboard.currentlyReading": "Currently reading",
   "dashboard.recentlyRead": "Recently read",
-  "dashboard.readingActivity": "Reading activity (last 12 months)",
+  "dashboard.readingActivity": "Reading activity",
   "dashboard.pageProgress": "p. {{current}} / {{total}}",
   "dashboard.noCurrentlyReading": "No books in progress",
   "dashboard.noRecentlyRead": "No books read recently",

apps/backoffice/lib/i18n/fr.ts

@@ -68,7 +68,10 @@ const fr = {
   "dashboard.readingStatus": "Statut de lecture",
   "dashboard.byFormat": "Par format",
   "dashboard.byLibrary": "Par bibliothèque",
-  "dashboard.booksAdded": "Livres ajoutés (12 derniers mois)",
+  "dashboard.booksAdded": "Livres ajoutés",
+  "dashboard.periodDay": "Jour",
+  "dashboard.periodWeek": "Semaine",
+  "dashboard.periodMonth": "Mois",
   "dashboard.popularSeries": "Séries populaires",
   "dashboard.noSeries": "Aucune série pour le moment",
   "dashboard.unknown": "Inconnu",
@@ -82,7 +85,7 @@ const fr = {
   "dashboard.withIsbn": "Avec ISBN",
   "dashboard.currentlyReading": "En cours de lecture",
   "dashboard.recentlyRead": "Derniers livres lus",
-  "dashboard.readingActivity": "Activité de lecture (12 derniers mois)",
+  "dashboard.readingActivity": "Activité de lecture",
   "dashboard.pageProgress": "p. {{current}} / {{total}}",
   "dashboard.noCurrentlyReading": "Aucun livre en cours",
   "dashboard.noRecentlyRead": "Aucun livre lu récemment",