feat(ui): add WeightedRoundRobinFlow component

ui/litellm-dashboard/src/components/routing_groups/WeightedRoundRobinFlow.tsx

@@ -0,0 +1,122 @@
+"use client";
+import React from "react";
+import AnimatedStream from "./AnimatedStream";
+import DeploymentCard from "./DeploymentCard";
+
+const PROVIDER_COLORS: Record<string, string> = {
+  nebius: "#14b8a6",
+  fireworks_ai: "#f97316",
+  azure: "#8b5cf6",
+  openai: "#10b981",
+  anthropic: "#d97706",
+  google: "#3b82f6",
+  aws: "#ef4444",
+};
+const getProviderColor = (p: string) => PROVIDER_COLORS[p.toLowerCase()] ?? "#6b7280";
+
+interface Deployment {
+  deployment_id: string;
+  provider: string;
+  display_name: string;
+  weight?: number;
+  avg_latency_ms: number;
+  percent_of_total: number;
+  request_count: number;
+}
+
+interface WeightedRoundRobinFlowProps {
+  deployments: Deployment[];
+  routingGroupName: string;
+}
+
+const CARD_HEIGHT = 76;
+const CARD_GAP = 28;
+const CARD_WIDTH = 220;
+const LEFT_PADDING = 40;
+const HUB_RADIUS = 28;
+
+export default function WeightedRoundRobinFlow({ deployments }: WeightedRoundRobinFlowProps) {
+  // Sort by weight desc (highest traffic first = top position)
+  const sorted = [...deployments].sort((a, b) => (b.weight ?? 0) - (a.weight ?? 0));
+  const totalHeight = sorted.length * CARD_HEIGHT + (sorted.length - 1) * CARD_GAP + 80;
+  const svgWidth = 600;
+
+  const hubX = svgWidth * 0.32;
+  const hubY = totalHeight / 2;
+
+  const cardX = svgWidth - CARD_WIDTH - LEFT_PADDING;
+
+  const blockHeight = sorted.length * CARD_HEIGHT + (sorted.length - 1) * CARD_GAP;
+  const blockTop = (totalHeight - blockHeight) / 2;
+  const cardCenterYs = sorted.map((_, i) => blockTop + i * (CARD_HEIGHT + CARD_GAP) + CARD_HEIGHT / 2);
+
+  // Max thickness 14px for 100%, min 2px
+  const maxPct = Math.max(...sorted.map((d) => d.percent_of_total), 1);
+  const getThickness = (pct: number) => Math.max(2, Math.round((pct / maxPct) * 14));
+
+  // Bezier path from hub to each card center
+  const getPath = (targetY: number) => {
+    const cp1x = hubX + 80;
+    const cp2x = cardX - 60;
+    return `M ${hubX} ${hubY} C ${cp1x} ${hubY} ${cp2x} ${targetY} ${cardX} ${targetY}`;
+  };
+
+  return (
+    <div className="relative w-full overflow-hidden rounded-2xl bg-[#0f1117]" style={{ minHeight: totalHeight + 40 }}>
+      <svg
+        className="absolute inset-0"
+        width="100%"
+        height={totalHeight + 40}
+        viewBox={`0 0 ${svgWidth} ${totalHeight + 40}`}
+        preserveAspectRatio="xMidYMid meet"
+      >
+        {/* Client → hub */}
+        <AnimatedStream
+          path={`M 20 ${hubY} L ${hubX - HUB_RADIUS} ${hubY}`}
+          color="#14b8a6"
+          thickness={6}
+        />
+
+        {/* Hub */}
+        <circle cx={hubX} cy={hubY} r={HUB_RADIUS} fill="#1a2535" stroke="#14b8a6" strokeWidth={2} strokeOpacity={0.6} />
+        <text x={hubX} y={hubY + 4} textAnchor="middle" fill="#14b8a6" fontSize={8} fontWeight="600" fontFamily="monospace">
+          LITELLM
+        </text>
+
+        {/* Fan-out streams */}
+        {sorted.map((dep, i) => (
+          <AnimatedStream
+            key={dep.deployment_id}
+            path={getPath(cardCenterYs[i])}
+            color={getProviderColor(dep.provider)}
+            thickness={getThickness(dep.percent_of_total)}
+          />
+        ))}
+      </svg>
+
+      {/* "client" label */}
+      <div className="absolute text-xs font-mono text-gray-500" style={{ left: 24, top: hubY + 40 - 8 }}>
+        client
+      </div>
+
+      {/* Cards */}
+      <div className="absolute" style={{ right: LEFT_PADDING, top: 20 }}>
+        <div className="flex flex-col" style={{ gap: CARD_GAP }}>
+          {sorted.map((dep) => (
+            <DeploymentCard
+              key={dep.deployment_id}
+              provider={dep.provider}
+              displayName={dep.display_name}
+              providerColor={getProviderColor(dep.provider)}
+              label={`Weight ${dep.weight ?? Math.round(dep.percent_of_total)}%`}
+              avgLatencyMs={dep.avg_latency_ms}
+              percentage={dep.percent_of_total}
+              requestCount={dep.request_count}
+              width={CARD_WIDTH}
+            />
+          ))}
+        </div>
+      </div>
+    </div>
+  );
+}