compare shows +/- instead of full amounts for easier consumption

src/components/HistoryChart.tsx

@@ -5,8 +5,6 @@ export interface ChartDataPoint {
   id: string;
   amount: number;
   compareAmount?: number;
-  count?: number;
-  compareLabel?: string;
   highlighted?: boolean;
 }
 
@@ -32,12 +30,46 @@ export interface HistoryChartProps {
   setComparison: (mode: boolean) => void;
 }
 
-export interface AggregatedDashboardData {
-  chartData: ChartData;
-  totalAmount: number;
-  topPayees: Array<{ payeeName: string; amount: number }>;
-}
+const formatDisplay = (point: ChartDataPoint, tab: string) => {
+  const base = point.amount;
+  const cmp = point.compareAmount || 0;
 
+  const diff = base - cmp;
+  const sign = diff >= 0 ? "+" : "-";
+  const absDiff = Math.abs(diff);
+
+  const formatShort = (val: number) => {
+    if (tab === "monthly") {
+      if (val >= 100000) return `${(val / 100000).toFixed(2)}L`;
+    }
+    if (tab === "weekly") {
+      if (val >= 1000) return `${(val / 1000).toFixed(1)}K`;
+    }
+    return val.toLocaleString("en-IN");
+  };
+
+  if (!cmp) return `₹ ${formatShort(base)}`;
+
+  return `₹ ${formatShort(base)} (${sign}${formatShort(absDiff)})`;
+};
+
+const formatLabel = (label: string, type: string) => {
+  if (type === "monthly") return label;
+
+  if (type === "weekly") {
+    const parts = label.split(" - ");
+    if (parts.length === 2) {
+      const [start, end] = parts;
+      const startDay = start.split(" ")[0];
+      const endParts = end.split(" ");
+      const endDay = endParts[0];
+      const month = endParts[1];
+      return `${startDay}–${endDay} ${month}`;
+    }
+  }
+
+  return label;
+};
 
 export default function HistoryChart({
   header,
@@ -52,9 +84,7 @@ export default function HistoryChart({
   const [activeTab, setActiveTab] = React.useState<string>(tabs[0] || "");
 
   const handleTabChange = (_: React.MouseEvent<HTMLElement>, newTab: string | null) => {
-    if (newTab !== null) {
-      setActiveTab(newTab);
-    }
+    if (newTab !== null) setActiveTab(newTab);
   };
 
   const activeDataKey = activeTab.toLowerCase() as keyof ChartData;
@@ -80,24 +110,6 @@ export default function HistoryChart({
         )
       : 1;
 
-  const formatAmount = (amount: number) => {
-    const tab = activeTab.toLowerCase();
-
-    if (amount === 0) return "";
-
-    if (tab === "monthly") {
-      if (amount >= 100000) return `₹ ${(amount / 100000).toFixed(2)} L`;
-      return `₹ ${amount.toLocaleString("en-IN")}`;
-    }
-
-    if (tab === "weekly") {
-      if (amount >= 1000) return `₹ ${(amount / 1000).toFixed(1)} K`;
-      return `₹ ${amount.toLocaleString("en-IN")}`;
-    }
-
-    return `₹ ${amount.toLocaleString("en-IN")}`;
-  };
-
   return (
     <Paper
       sx={{
@@ -119,38 +131,12 @@ export default function HistoryChart({
         </Typography>
       )}
 
-      {/* Tabs */}
       <ToggleButtonGroup
         value={activeTab}
         exclusive
         onChange={handleTabChange}
         fullWidth
-        sx={{
-          mb: 4,
-          bgcolor: (theme) =>
-            theme.palette.mode === "dark"
-              ? "rgba(255,255,255,0.05)"
-              : "rgba(0,0,0,0.02)",
-          borderRadius: 8,
-          p: 0.5,
-          "& .MuiToggleButton-root": {
-            border: "none",
-            borderRadius: 8,
-            textTransform: "capitalize",
-            fontWeight: 600,
-            color: "text.secondary",
-            "&.Mui-selected": {
-              bgcolor: (theme) =>
-                theme.palette.mode === "dark"
-                  ? "primary.dark"
-                  : "primary.light",
-              color: (theme) =>
-                theme.palette.mode === "dark"
-                  ? "primary.contrastText"
-                  : "primary.main"
-            }
-          }
-        }}
+        sx={{ mb: 4 }}
       >
         {tabs.map((tab) => (
           <ToggleButton key={tab} value={tab}>
@@ -159,7 +145,6 @@ export default function HistoryChart({
         ))}
       </ToggleButtonGroup>
 
-      {/* Period Toggle */}
       <ToggleButtonGroup
         value={period}
         exclusive
@@ -184,7 +169,6 @@ export default function HistoryChart({
         <ToggleButton value="on">Compare</ToggleButton>
       </ToggleButtonGroup>
 
-      {/* Chart */}
       {currentData.length > 0 ? (
         <Box sx={{ display: "flex", alignItems: "flex-end", height: 220, mt: 4 }}>
           {currentData.map((point) => {
@@ -203,29 +187,15 @@ export default function HistoryChart({
                   height: "100%"
                 }}
               >
-                {/* Values */}
-                <Box sx={{ mb: 1, textAlign: "center" }}>
-                  {comparison && point.compareAmount ? (
-                    <Typography variant="caption" sx={{ fontSize: "0.6rem", color: "text.secondary" }}>
-                      {formatAmount(point.compareAmount)}
-                    </Typography>
-                  ) : null}
-
-                  <Typography variant="caption" sx={{ fontSize: "0.65rem" }}>
-                    {formatAmount(point.amount)}
-                  </Typography>
-                </Box>
-
-                {/* Bars */}
                 <Box
                   sx={{
                     display: "flex",
                     alignItems: "flex-end",
                     gap: comparison ? 0.5 : 0,
-                    height: "100%"
+                    height: "100%",
+                    position: "relative"
                   }}
                 >
-                  {/* Compare */}
                   {comparison && (
                     <Box
                       sx={{
@@ -237,37 +207,43 @@ export default function HistoryChart({
                     />
                   )}
 
-                  {/* Current */}
                   <Box
                     sx={{
                       width: 10,
                       height: `${currentHeight}%`,
                       bgcolor: point.highlighted ? "error.main" : "primary.main",
-                      borderRadius: 2
+                      borderRadius: 2,
+                      position: "relative"
                     }}
-                  />
-                </Box>
-
-                {/* Label */}
-                <Box sx={{ mt: 1, textAlign: "center" }}>
-                  {comparison && point.compareLabel && (
+                  >
                     <Typography
                       variant="caption"
-                      color="text.secondary"
-                      sx={{ fontSize: "0.6rem", display: "block" }}
+                      sx={{
+                        position: "absolute",
+                        top: -18,
+                        left: "50%",
+                        transform: "translateX(-50%)",
+                        fontSize: "0.65rem",
+                        whiteSpace: "nowrap"
+                      }}
                     >
-                      {point.compareLabel}
+                      {formatDisplay(point, activeTab.toLowerCase())}
                     </Typography>
-                  )}
-
-                  <Typography
-                    variant="caption"
-                    color="text.secondary"
-                    sx={{ fontSize: "0.7rem", display: "block" }}
-                  >
-                    {point.id}
-                  </Typography>
+                  </Box>
                 </Box>
+
+                <Typography
+                  variant="caption"
+                  color="text.secondary"
+                  sx={{
+                    mt: 1,
+                    fontSize: "0.7rem",
+                    textAlign: "center",
+                    lineHeight: 1.2
+                  }}
+                >
+                  {formatLabel(point.id, activeDataKey)}
+                </Typography>
               </Box>
             );
           })}