From eac6228dde6daf9eb299567031e3aa23967b60bb Mon Sep 17 00:00:00 2001
From: Enrico Ros <enrico.ros@gmail.com>
Date: Tue, 20 May 2025 17:04:16 -0700
Subject: [PATCH] Stacked bar component

---
 src/common/components/StackedBarBreakdown.tsx | 85 +++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 src/common/components/StackedBarBreakdown.tsx

diff --git a/src/common/components/StackedBarBreakdown.tsx b/src/common/components/StackedBarBreakdown.tsx
new file mode 100644
index 000000000..8893e321e
--- /dev/null
+++ b/src/common/components/StackedBarBreakdown.tsx
@@ -0,0 +1,85 @@
+import * as React from 'react';
+
+import { Box, Typography } from '@mui/joy';
+
+
+/** Generic segment interface for stacked bar charts */
+export interface StackedBarSegment {
+  key: string;
+  label: string;
+  value: number;
+  color: string;
+}
+
+export interface StackedBarBreakdownProps {
+  /** Array of segments to display */
+  segments: StackedBarSegment[];
+  /** Optional title for the chart */
+  title?: string;
+  /** Whether to show absolute values in the legend (otherwise just percentages) */
+  showValues?: boolean;
+  /** Function to format values for display and tooltips */
+  valueFormatter?: (value: number) => string;
+  /** Optional description text below the chart */
+  description?: string;
+}
+
+
+export function StackedBarBreakdown({ segments, title, showValues = false, valueFormatter = (v) => v.toString(), description }: StackedBarBreakdownProps) {
+  // Calculate total for percentages
+  const total = segments.reduce((sum, seg) => sum + seg.value, 0) || 1;
+
+  // Filter out zero-value segments
+  const nonZeroSegments = segments.filter(seg => seg.value > 0);
+
+  return (
+    <Box>
+      {title && <Typography level='title-md' mb={1}>{title}</Typography>}
+
+      {/* The stacked bar */}
+      <Box sx={{
+        display: 'flex',
+        height: 8,
+        borderRadius: 8,
+        overflow: 'hidden',
+        my: 1,
+      }}>
+        {nonZeroSegments.map(({ key, value, color }) => {
+          const percentage = (value / total) * 100;
+          return (
+            <Box
+              key={key}
+              title={`${valueFormatter(value)} (${percentage.toFixed(0)}%)`}
+              sx={{
+                width: `${percentage}%`,
+                backgroundColor: color,
+                transition: 'width 0.3s ease-in-out',
+              }}
+            />
+          );
+        })}
+      </Box>
+
+      {/* Legend with colored squares */}
+      <Box sx={{ display: 'flex', flexWrap: 'wrap', gap: 1 }}>
+        {nonZeroSegments.map(({ key, label, value, color }) => {
+          const percentage = (value / total) * 100;
+          return (
+            <Box key={key} sx={{ display: 'flex', alignItems: 'center', gap: 0.5 }}>
+              <Box sx={{ width: 10, height: 10, backgroundColor: color, borderRadius: 2 }} />
+              <Typography level='body-xs'>
+                {label} {showValues
+                ? `${valueFormatter(value)} (${percentage.toFixed(0)}%)`
+                : `(${percentage.toFixed(0)}%)`}
+              </Typography>
+            </Box>
+          );
+        })}
+      </Box>
+
+      {description && (
+        <Typography level='body-sm' mt={1}>{description}</Typography>
+      )}
+    </Box>
+  );
+}