feat: enhance statistics page with new charts and data visualizations including savings trend, category trends, and year-over-year comparisons

components/statistics/year-over-year-chart.tsx

@@ -0,0 +1,91 @@
+"use client";
+
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+import {
+  BarChart,
+  Bar,
+  XAxis,
+  YAxis,
+  CartesianGrid,
+  Tooltip,
+  ResponsiveContainer,
+  Legend,
+} from "recharts";
+
+interface YearOverYearDataPoint {
+  month: string;
+  current: number;
+  previous: number;
+  label: string;
+}
+
+interface YearOverYearChartProps {
+  data: YearOverYearDataPoint[];
+  formatCurrency: (amount: number) => string;
+  currentYearLabel?: string;
+  previousYearLabel?: string;
+}
+
+export function YearOverYearChart({
+  data,
+  formatCurrency,
+  currentYearLabel = "Cette année",
+  previousYearLabel = "Année précédente",
+}: YearOverYearChartProps) {
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle>Comparaison année sur année</CardTitle>
+      </CardHeader>
+      <CardContent>
+        {data.length > 0 ? (
+          <div className="h-[300px]">
+            <ResponsiveContainer width="100%" height="100%">
+              <BarChart data={data}>
+                <CartesianGrid strokeDasharray="3 3" className="stroke-muted" />
+                <XAxis dataKey="month" className="text-xs" />
+                <YAxis
+                  className="text-xs"
+                  width={80}
+                  tickFormatter={(v) => {
+                    if (Math.abs(v) >= 1000) {
+                      return `${(v / 1000).toFixed(1)}k€`;
+                    }
+                    return `${Math.round(v)}€`;
+                  }}
+                  tick={{ fill: "var(--muted-foreground)" }}
+                />
+                <Tooltip
+                  formatter={(value: number) => formatCurrency(value)}
+                  contentStyle={{
+                    backgroundColor: "var(--card)",
+                    border: "1px solid var(--border)",
+                    borderRadius: "8px",
+                  }}
+                />
+                <Legend />
+                <Bar
+                  dataKey="current"
+                  name={currentYearLabel}
+                  fill="#6366f1"
+                  radius={[4, 4, 0, 0]}
+                />
+                <Bar
+                  dataKey="previous"
+                  name={previousYearLabel}
+                  fill="#94a3b8"
+                  radius={[4, 4, 0, 0]}
+                />
+              </BarChart>
+            </ResponsiveContainer>
+          </div>
+        ) : (
+          <div className="h-[300px] flex items-center justify-center text-muted-foreground">
+            Pas de données pour cette période
+          </div>
+        )}
+      </CardContent>
+    </Card>
+  );
+}
+