feat: vue flux — arcs dirigés entre villes géolocalisées

- Nouveau type TransactionArc + buildCorridors + computeFlowStats
- FlowMap : SVG overlay Leaflet, arcs bezier, flèches de direction, nœuds de villes cliquables
- Clic sur une ville : arcs sortants orange, entrants teal, reste grisé
- DataService : résolution géo des destinataires (toId) dans le même appel Cesium+
- useAnimation : expose visibleArcs filtré par frame
- PeriodSelector : bouton toggle Heatmap / Flux
- StatsPanel : stats flux (volume, top émetteurs, top récepteurs, balance nette)
- App : state viewMode + focusCity, FlowMap conditionnel

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

src/App.tsx

@@ -1,17 +1,21 @@
-import { useState, useEffect } from 'react';
+import { useState, useEffect, useMemo } from 'react';
 import { StatsPanel } from './components/StatsPanel';
 import { PeriodSelector } from './components/PeriodSelector';
 import { HeatMap } from './components/HeatMap';
+import { FlowMap } from './components/FlowMap';
 import { AnimationPlayer } from './components/AnimationPlayer';
 import { fetchData } from './services/DataService';
 import type { PeriodStats } from './services/DataService';
 import type { Transaction } from './data/mockData';
+import type { TransactionArc } from './data/arcData';
 import { computeStats } from './data/mockData';
+import { computeFlowStats } from './data/arcData';
 import { useAnimation } from './hooks/useAnimation';
 
 export default function App() {
   const [periodDays, setPeriodDays] = useState(7);
   const [transactions, setTransactions] = useState<Transaction[]>([]);
+  const [arcs, setArcs] = useState<TransactionArc[]>([]);
   const [stats, setStats] = useState<PeriodStats | null>(null);
   const [loading, setLoading] = useState(true);
   const [refreshing, setRefreshing] = useState(false);
@@ -19,14 +23,21 @@ export default function App() {
   const [source, setSource] = useState<'live' | 'mock'>('mock');
   const [currentUD, setCurrentUD] = useState<number>(11.78);
   const [allTimestamps, setAllTimestamps] = useState<number[]>([]);
+  const [viewMode, setViewMode] = useState<'heatmap' | 'flow'>('heatmap');
+  const [focusCity, setFocusCity] = useState<string | null>(null);
 
-  const animation = useAnimation(transactions, periodDays, allTimestamps);
+  const animation = useAnimation(transactions, arcs, periodDays, allTimestamps);
 
   const handlePeriodChange = (days: number) => {
     animation.deactivate();
     setPeriodDays(days);
   };
 
+  const handleViewModeChange = (mode: 'heatmap' | 'flow') => {
+    setViewMode(mode);
+    setFocusCity(null);
+  };
+
   useEffect(() => {
     let cancelled = false;
 
@@ -34,9 +45,10 @@ export default function App() {
       if (showLoading) setLoading(true);
       else setRefreshing(true);
       fetchData(periodDays)
-        .then(({ transactions, stats, source, currentUD, allTimestamps }) => {
+        .then(({ transactions, arcs, stats, source, currentUD, allTimestamps }) => {
           if (!cancelled) {
             setTransactions(transactions);
+            setArcs(arcs);
             setStats(stats);
             setSource(source);
             setCurrentUD(currentUD);
@@ -56,16 +68,24 @@ export default function App() {
     return () => { cancelled = true; clearInterval(interval); };
   }, [periodDays]);
 
-  // Stats calculées sur la fenêtre courante en mode animation
+  // Stats heatmap sur la fenêtre courante en mode animation
   const visibleStats: PeriodStats | null = animation.active
     ? {
         ...computeStats(animation.visibleTransactions),
         geoCount: animation.visibleTransactions.length,
-        // frameTotalCount = total réel (géo + non-géo) dans cette frame
         transactionCount: animation.frameTotalCount ?? animation.visibleTransactions.length,
       }
     : stats;
 
+  // Stats flux (recalculées sur les arcs visibles)
+  const flowStats = useMemo(
+    () => {
+      const activeArcs = animation.active ? animation.visibleArcs : arcs;
+      return activeArcs.length > 0 ? computeFlowStats(activeArcs) : null;
+    },
+    [arcs, animation.visibleArcs, animation.active],
+  );
+
   return (
     <div className="flex h-svh w-full overflow-hidden bg-[#0a0b0f] text-white">
       {/* Side panel */}
@@ -76,11 +96,22 @@ export default function App() {
         source={source}
         currentUD={currentUD}
         animationLabel={animation.active ? (animation.currentFrame?.label ?? undefined) : undefined}
+        viewMode={viewMode}
+        flowStats={flowStats}
+        focusCity={focusCity}
       />
 
       {/* Map area */}
       <div className="relative flex-1 min-w-0">
-        <HeatMap transactions={animation.visibleTransactions} />
+        {viewMode === 'heatmap' ? (
+          <HeatMap transactions={animation.visibleTransactions} />
+        ) : (
+          <FlowMap
+            arcs={animation.active ? animation.visibleArcs : arcs}
+            focusCity={focusCity}
+            onCityClick={setFocusCity}
+          />
+        )}
 
         {/* Period selector — floating over map */}
         <div className="absolute top-4 left-1/2 -translate-x-1/2 z-[1000]">
@@ -89,6 +120,8 @@ export default function App() {
             onChange={handlePeriodChange}
             animationActive={animation.active}
             onAnimate={() => animation.active ? animation.deactivate() : animation.activate()}
+            viewMode={viewMode}
+            onViewModeChange={handleViewModeChange}
           />
         </div>
 

src/components/FlowMap.tsx

@@ -0,0 +1,209 @@
+import { useEffect, useRef, useState, useMemo } from 'react';
+import L from 'leaflet';
+import type { TransactionArc } from '../data/arcData';
+import { buildCorridors } from '../data/arcData';
+
+// Leaflet default marker fix (Vite asset pipeline)
+import iconUrl from 'leaflet/dist/images/marker-icon.png';
+import iconShadowUrl from 'leaflet/dist/images/marker-shadow.png';
+L.Icon.Default.mergeOptions({ iconUrl, shadowUrl: iconShadowUrl });
+
+interface FlowMapProps {
+  arcs:        TransactionArc[];
+  focusCity:   string | null;
+  onCityClick: (city: string | null) => void;
+}
+
+export function FlowMap({ arcs, focusCity, onCityClick }: FlowMapProps) {
+  const containerRef = useRef<HTMLDivElement>(null);
+  const mapRef       = useRef<L.Map | null>(null);
+  const [mapReady, setMapReady] = useState(false);
+  const [tick, setTick]         = useState(0); // incrémenté sur moveend/zoomend → re-render
+
+  // Initialisation Leaflet
+  useEffect(() => {
+    if (!containerRef.current || mapRef.current) return;
+
+    const map = L.map(containerRef.current, {
+      center: [46.8, 2.35],
+      zoom: 6,
+      zoomControl: false,
+      attributionControl: true,
+    });
+
+    L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
+      attribution: '© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a>',
+      maxZoom: 18,
+    }).addTo(map);
+
+    L.control.zoom({ position: 'bottomright' }).addTo(map);
+
+    mapRef.current = map;
+    setMapReady(true);
+
+    return () => {
+      map.remove();
+      mapRef.current = null;
+      setMapReady(false);
+    };
+  }, []);
+
+  // Re-projette le SVG à chaque déplacement/zoom
+  useEffect(() => {
+    if (!mapReady || !mapRef.current) return;
+    const onMove = () => setTick(t => t + 1);
+    mapRef.current.on('moveend zoomend', onMove);
+    return () => { mapRef.current?.off('moveend zoomend', onMove); };
+  }, [mapReady]);
+
+  // Agrégation en corridors
+  const corridors = useMemo(() => buildCorridors(arcs), [arcs]);
+
+  // Nœuds de villes (volume entrant + sortant)
+  const cityNodes = useMemo(() => {
+    const map = new Map<string, { lat: number; lng: number; emitted: number; received: number }>();
+    for (const c of corridors) {
+      if (!map.has(c.fromCity)) map.set(c.fromCity, { lat: c.fromLat, lng: c.fromLng, emitted: 0, received: 0 });
+      map.get(c.fromCity)!.emitted += c.totalVolume;
+      if (!map.has(c.toCity))   map.set(c.toCity,   { lat: c.toLat,   lng: c.toLng,   emitted: 0, received: 0 });
+      map.get(c.toCity)!.received += c.totalVolume;
+    }
+    return map;
+  }, [corridors]);
+
+  // Projection SVG (recalculée sur chaque tick, changement d'arcs ou de focusCity)
+  const svgElements = useMemo(() => {
+    const m = mapRef.current;
+    if (!m || !mapReady) return null;
+
+    const proj = (lat: number, lng: number) => {
+      const p = m.latLngToContainerPoint([lat, lng]);
+      return { x: p.x, y: p.y };
+    };
+
+    const maxVol     = Math.max(...corridors.map(c => c.totalVolume), 1);
+    const maxNodeVol = Math.max(...[...cityNodes.values()].map(c => c.emitted + c.received), 1);
+
+    // ---- Arcs ----
+    const arcElems = corridors.map((c, idx) => {
+      const p1 = proj(c.fromLat, c.fromLng);
+      const p2 = proj(c.toLat,   c.toLng);
+
+      // Point de contrôle bezier quadratique : décalage perpendiculaire au milieu
+      const mx = (p1.x + p2.x) / 2;
+      const my = (p1.y + p2.y) / 2;
+      const dx = p2.x - p1.x;
+      const dy = p2.y - p1.y;
+      const CURVE = 0.28;
+      const cx = mx - dy * CURVE;
+      const cy = my + dx * CURVE;
+
+      // Flèche de direction au milieu (t = 0.5) du bezier
+      const t   = 0.5;
+      const ax  = (1-t)*(1-t)*p1.x + 2*(1-t)*t*cx + t*t*p2.x;
+      const ay  = (1-t)*(1-t)*p1.y + 2*(1-t)*t*cy + t*t*p2.y;
+      const tln = Math.sqrt(dx*dx + dy*dy) || 1;
+      const nx  = dx / tln; const ny = dy / tln;   // tangente normalisée
+      const px  = -ny;      const py = nx;          // perpendiculaire
+      const AR  = 5;
+      const arrowPts = [
+        `${ax + nx*AR},${ay + ny*AR}`,
+        `${ax - nx*AR*0.6 + px*AR*0.5},${ay - ny*AR*0.6 + py*AR*0.5}`,
+        `${ax - nx*AR*0.6 - px*AR*0.5},${ay - ny*AR*0.6 - py*AR*0.5}`,
+      ].join(' ');
+
+      const ratio    = c.totalVolume / maxVol;
+      const strokeW  = Math.max(1, 1.5 + Math.log1p(c.totalVolume) * 0.8);
+      const opacity  = 0.35 + 0.55 * ratio;
+
+      // Couleur selon focusCity
+      const isFocusFrom = focusCity && c.fromCity === focusCity;
+      const isFocusTo   = focusCity && c.toCity   === focusCity;
+      const stroke      = !focusCity ? `url(#grad${idx})`
+                        : isFocusFrom ? '#ff8f00'
+                        : isFocusTo   ? '#00acc1'
+                        : '#2e2f3a';
+      const arrowFill   = !focusCity ? '#e65100'
+                        : isFocusFrom ? '#ff8f00'
+                        : isFocusTo   ? '#00acc1'
+                        : '#2e2f3a';
+
+      return {
+        idx, c, p1, p2, cx, cy, arrowPts, strokeW, opacity, stroke, arrowFill,
+        path: `M ${p1.x},${p1.y} Q ${cx},${cy} ${p2.x},${p2.y}`,
+      };
+    });
+
+    // ---- Nœuds ----
+    const nodeElems = [...cityNodes.entries()].map(([name, data]) => {
+      const p   = proj(data.lat, data.lng);
+      const vol = data.emitted + data.received;
+      const r   = Math.max(3, Math.min(14, 3 + 9 * (vol / maxNodeVol)));
+      return { name, p, r, isSelected: focusCity === name };
+    });
+
+    return { arcElems, nodeElems };
+  // tick en dep pour re-projeter sur pan/zoom
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [corridors, cityNodes, focusCity, tick, mapReady]);
+
+  return (
+    <div className="w-full h-full relative" style={{ minHeight: 0 }}>
+      <div ref={containerRef} className="absolute inset-0" />
+
+      {mapReady && svgElements && (
+        <svg
+          className="absolute inset-0 w-full h-full"
+          style={{ zIndex: 500, pointerEvents: 'none' }}
+        >
+          {/* Dégradés or→orange pour les arcs (aucune ville sélectionnée) */}
+          <defs>
+            {svgElements.arcElems.map(a => (
+              <linearGradient
+                key={`grad${a.idx}`}
+                id={`grad${a.idx}`}
+                x1={a.p1.x} y1={a.p1.y}
+                x2={a.p2.x} y2={a.p2.y}
+                gradientUnits="userSpaceOnUse"
+              >
+                <stop offset="0%"   stopColor="#d4a843" />
+                <stop offset="100%" stopColor="#e65100" />
+              </linearGradient>
+            ))}
+          </defs>
+
+          {/* Arcs bezier */}
+          {svgElements.arcElems.map(a => (
+            <g key={`${a.c.fromCity}-${a.c.toCity}`} opacity={a.opacity}>
+              <path
+                d={a.path}
+                fill="none"
+                stroke={a.stroke}
+                strokeWidth={a.strokeW}
+                strokeLinecap="round"
+              />
+              <polygon points={a.arrowPts} fill={a.arrowFill} />
+            </g>
+          ))}
+
+          {/* Nœuds de villes (pointer-events activés uniquement ici) */}
+          <g style={{ pointerEvents: 'all' }}>
+            {svgElements.nodeElems.map(node => (
+              <circle
+                key={node.name}
+                cx={node.p.x}
+                cy={node.p.y}
+                r={node.r}
+                fill={node.isSelected ? '#ffffff' : '#d4a843'}
+                stroke={node.isSelected ? '#d4a843' : '#0a0b0f'}
+                strokeWidth={1.5}
+                style={{ cursor: 'pointer' }}
+                onClick={() => onCityClick(focusCity === node.name ? null : node.name)}
+              />
+            ))}
+          </g>
+        </svg>
+      )}
+    </div>
+  );
+}

src/components/PeriodSelector.tsx

@@ -5,6 +5,8 @@ interface PeriodSelectorProps {
   onChange: (days: number) => void;
   animationActive: boolean;
   onAnimate: () => void;
+  viewMode: 'heatmap' | 'flow';
+  onViewModeChange: (mode: 'heatmap' | 'flow') => void;
 }
 
 const PERIODS = [
@@ -15,7 +17,7 @@ const PERIODS = [
 
 const PRESET_DAYS = new Set([1, 7, 30]);
 
-export function PeriodSelector({ value, onChange, animationActive, onAnimate }: PeriodSelectorProps) {
+export function PeriodSelector({ value, onChange, animationActive, onAnimate, viewMode, onViewModeChange }: PeriodSelectorProps) {
   const [customOpen, setCustomOpen] = useState(false);
   const [inputVal, setInputVal] = useState('');
   const inputRef = useRef<HTMLInputElement>(null);
@@ -107,6 +109,21 @@ export function PeriodSelector({ value, onChange, animationActive, onAnimate }:
       >
         ▶ Animer
       </button>
+
+      <div className="w-px mx-1 bg-[#2e2f3a] self-stretch" />
+
+      <button
+        onClick={() => onViewModeChange(viewMode === 'heatmap' ? 'flow' : 'heatmap')}
+        className={`
+          px-3 py-1.5 rounded-md text-sm font-medium transition-all duration-200 cursor-pointer
+          ${viewMode === 'flow'
+            ? 'bg-[#d4a843] text-[#0a0b0f] shadow-[0_0_12px_rgba(212,168,67,0.4)]'
+            : 'text-[#6b7280] hover:text-[#d4a843] hover:bg-[#1a1b23]'
+          }
+        `}
+      >
+        {viewMode === 'flow' ? '⊙ Heatmap' : '◉ Flux'}
+      </button>
     </div>
   );
 }

src/components/StatsPanel.tsx

@@ -1,5 +1,6 @@
 import { useRef } from 'react';
 import type { PeriodStats } from '../services/DataService';
+import type { FlowStats } from '../data/arcData';
 
 interface StatsPanelProps {
   stats: PeriodStats | null;
@@ -8,6 +9,9 @@ interface StatsPanelProps {
   source: 'live' | 'mock';
   currentUD: number;
   animationLabel?: string;
+  viewMode?: 'heatmap' | 'flow';
+  flowStats?: FlowStats | null;
+  focusCity?: string | null;
 }
 
 const MEDALS = ['🥇', '🥈', '🥉'];
@@ -33,7 +37,28 @@ function formatDU(g1: number, ud: number): string {
   return `≈ ${Math.round(du).toLocaleString('fr-FR')} DU`;
 }
 
-export function StatsPanel({ stats, loading, periodDays, source, currentUD, animationLabel }: StatsPanelProps) {
+function CityRow({ city, volume, count, countryCode, accent }: {
+  city: string; volume: number; count: number; countryCode: string; accent?: string;
+}) {
+  return (
+    <div className="flex items-center justify-between">
+      <span className="flex items-center gap-1.5 text-white text-xs font-medium truncate">
+        {countryCode && (
+          <span className="text-[10px] font-bold bg-[#1e1f2a] text-[#6b7280] rounded px-1 py-0.5 leading-none shrink-0">
+            {countryCode}
+          </span>
+        )}
+        <span className="truncate">{city}</span>
+      </span>
+      <span className={`text-xs font-mono shrink-0 ml-1 ${accent ?? 'text-[#d4a843]'}`}>
+        {volume.toLocaleString('fr-FR', { maximumFractionDigits: 0 })} Ğ1
+        <span className="text-[#4b5563] ml-0.5">· {count}</span>
+      </span>
+    </div>
+  );
+}
+
+export function StatsPanel({ stats, loading, periodDays, source, currentUD, animationLabel, viewMode = 'heatmap', flowStats, focusCity }: StatsPanelProps) {
   const periodLabel = periodDays === 1 ? '24 dernières heures' : `${periodDays} derniers jours`;
   const prevStats = useRef<PeriodStats | null>(null);
 
@@ -85,84 +110,171 @@ export function StatsPanel({ stats, loading, periodDays, source, currentUD, anim
         }
       </p>
 
-      {/* Stats */}
+      {/* ---- Vue HEATMAP ---- */}
-      {loading ? (
+      {viewMode === 'heatmap' && (
-        <div className="space-y-3">
+        <>
-          {[1, 2].map((i) => (
+          {loading ? (
-            <div key={i} className="bg-[#0f1016] border border-[#2e2f3a] rounded-xl p-4 h-20 animate-pulse" />
+            <div className="space-y-3">
-          ))}
+              {[1, 2].map((i) => (
-        </div>
+                <div key={i} className="bg-[#0f1016] border border-[#2e2f3a] rounded-xl p-4 h-20 animate-pulse" />
-      ) : stats ? (
+              ))}
-        <div className="space-y-3">
-          <StatCard
-            label="Volume total"
-            value={`${stats.totalVolume.toLocaleString('fr-FR', { maximumFractionDigits: 2 })} Ğ1`}
-            sub={formatDU(stats.totalVolume, currentUD)}
-            delta={prevVolume !== null ? (stats.totalVolume > prevVolume ? 'up' : stats.totalVolume < prevVolume ? 'down' : null) : null}
-          />
-          <StatCard
-            label="Transactions"
-            value={stats.transactionCount.toLocaleString('fr-FR')}
-            sub={(() => {
-              const avg = stats.totalVolume / (stats.transactionCount || 1);
-              return `≈ ${avg.toFixed(2)} Ğ1 / tx  ·  ${formatDU(avg, currentUD)} / tx`;
-            })()}
-            delta={prevTxCount !== null ? (stats.transactionCount > prevTxCount ? 'up' : stats.transactionCount < prevTxCount ? 'down' : null) : null}
-          />
-          {/* Couverture géo — transactionCount inclut le total réel de la frame */}
-          {source === 'live' && stats.transactionCount > 0 && (() => {
-            const pct = Math.round((stats.geoCount / stats.transactionCount) * 100);
-            return (
-              <div className="bg-[#0f1016] border border-[#2e2f3a] rounded-xl p-3">
-                <div className="flex justify-between items-center mb-1.5">
-                  <p className="text-[#4b5563] text-xs uppercase tracking-widest">Géolocalisées</p>
-                  <p className="text-[#6b7280] text-xs">{stats.geoCount} / {stats.transactionCount}</p>
-                </div>
-                <div className="w-full bg-[#1e1f2a] rounded-full h-1.5">
-                  <div
-                    className="bg-[#d4a843] h-1.5 rounded-full transition-all duration-500"
-                    style={{ width: `${pct}%` }}
-                  />
-                </div>
-                <p className="text-[#4b5563] text-xs mt-1 text-right">{pct}% via Cesium+</p>
-              </div>
-            );
-          })()}
-        </div>
-      ) : null}
-
-      {/* Top cities */}
-      {!loading && stats && stats.topCities.length > 0 && (
-        <div className="space-y-2">
-          <p className="text-[#4b5563] text-xs uppercase tracking-widest border-t border-[#1e1f2a] pt-3">
-            Top villes
-          </p>
-          {stats.topCities.map((city, i) => (
-            <div
-              key={city.name}
-              className="bg-[#0f1016] border border-[#2e2f3a] rounded-lg px-3 py-2.5 flex gap-2.5"
-            >
-              <span className="text-base shrink-0 mt-0.5">{MEDALS[i]}</span>
-              <div className="flex-1 min-w-0">
-                <p className="text-white text-xs font-medium leading-snug">{city.name}</p>
-                <div className="flex items-center justify-between mt-1">
-                  <span className="flex items-center gap-1.5 text-[#6b7280] text-xs">
-                    {city.countryCode && (
-                      <span className="text-[10px] font-bold bg-[#1e1f2a] text-[#6b7280] rounded px-1 py-0.5 leading-none">
-                        {city.countryCode}
-                      </span>
-                    )}
-                    {city.count} tx
-                  </span>
-                  <span className="text-[#d4a843] text-xs font-mono flex items-center gap-1">
-                    {city.volume.toLocaleString('fr-FR', { maximumFractionDigits: 0 })} Ğ1
-                    {delta(city.volume, prevCityVolume, city.name)}
-                  </span>
-                </div>
-              </div>
             </div>
-          ))}
+          ) : stats ? (
-        </div>
+            <div className="space-y-3">
+              <StatCard
+                label="Volume total"
+                value={`${stats.totalVolume.toLocaleString('fr-FR', { maximumFractionDigits: 2 })} Ğ1`}
+                sub={formatDU(stats.totalVolume, currentUD)}
+                delta={prevVolume !== null ? (stats.totalVolume > prevVolume ? 'up' : stats.totalVolume < prevVolume ? 'down' : null) : null}
+              />
+              <StatCard
+                label="Transactions"
+                value={stats.transactionCount.toLocaleString('fr-FR')}
+                sub={(() => {
+                  const avg = stats.totalVolume / (stats.transactionCount || 1);
+                  return `≈ ${avg.toFixed(2)} Ğ1 / tx  ·  ${formatDU(avg, currentUD)} / tx`;
+                })()}
+                delta={prevTxCount !== null ? (stats.transactionCount > prevTxCount ? 'up' : stats.transactionCount < prevTxCount ? 'down' : null) : null}
+              />
+              {/* Couverture géo — transactionCount inclut le total réel de la frame */}
+              {source === 'live' && stats.transactionCount > 0 && (() => {
+                const pct = Math.round((stats.geoCount / stats.transactionCount) * 100);
+                return (
+                  <div className="bg-[#0f1016] border border-[#2e2f3a] rounded-xl p-3">
+                    <div className="flex justify-between items-center mb-1.5">
+                      <p className="text-[#4b5563] text-xs uppercase tracking-widest">Géolocalisées</p>
+                      <p className="text-[#6b7280] text-xs">{stats.geoCount} / {stats.transactionCount}</p>
+                    </div>
+                    <div className="w-full bg-[#1e1f2a] rounded-full h-1.5">
+                      <div
+                        className="bg-[#d4a843] h-1.5 rounded-full transition-all duration-500"
+                        style={{ width: `${pct}%` }}
+                      />
+                    </div>
+                    <p className="text-[#4b5563] text-xs mt-1 text-right">{pct}% via Cesium+</p>
+                  </div>
+                );
+              })()}
+            </div>
+          ) : null}
+
+          {/* Top cities */}
+          {!loading && stats && stats.topCities.length > 0 && (
+            <div className="space-y-2">
+              <p className="text-[#4b5563] text-xs uppercase tracking-widest border-t border-[#1e1f2a] pt-3">
+                Top villes
+              </p>
+              {stats.topCities.map((city, i) => (
+                <div
+                  key={city.name}
+                  className="bg-[#0f1016] border border-[#2e2f3a] rounded-lg px-3 py-2.5 flex gap-2.5"
+                >
+                  <span className="text-base shrink-0 mt-0.5">{MEDALS[i]}</span>
+                  <div className="flex-1 min-w-0">
+                    <p className="text-white text-xs font-medium leading-snug">{city.name}</p>
+                    <div className="flex items-center justify-between mt-1">
+                      <span className="flex items-center gap-1.5 text-[#6b7280] text-xs">
+                        {city.countryCode && (
+                          <span className="text-[10px] font-bold bg-[#1e1f2a] text-[#6b7280] rounded px-1 py-0.5 leading-none">
+                            {city.countryCode}
+                          </span>
+                        )}
+                        {city.count} tx
+                      </span>
+                      <span className="text-[#d4a843] text-xs font-mono flex items-center gap-1">
+                        {city.volume.toLocaleString('fr-FR', { maximumFractionDigits: 0 })} Ğ1
+                        {delta(city.volume, prevCityVolume, city.name)}
+                      </span>
+                    </div>
+                  </div>
+                </div>
+              ))}
+            </div>
+          )}
+        </>
+      )}
+
+      {/* ---- Vue FLUX ---- */}
+      {viewMode === 'flow' && (
+        <>
+          {loading ? (
+            <div className="space-y-3">
+              {[1, 2, 3].map((i) => (
+                <div key={i} className="bg-[#0f1016] border border-[#2e2f3a] rounded-xl p-4 h-16 animate-pulse" />
+              ))}
+            </div>
+          ) : flowStats ? (
+            <div className="space-y-3">
+              <StatCard
+                label="Volume des flux"
+                value={`${flowStats.totalVolume.toLocaleString('fr-FR', { maximumFractionDigits: 2 })} Ğ1`}
+                sub={formatDU(flowStats.totalVolume, currentUD)}
+              />
+              <StatCard
+                label="Arcs géolocalisés"
+                value={flowStats.arcCount.toLocaleString('fr-FR')}
+                sub={flowStats.arcCount > 0
+                  ? `≈ ${(flowStats.totalVolume / flowStats.arcCount).toFixed(2)} Ğ1 / arc`
+                  : undefined}
+              />
+
+              {/* Top émetteurs */}
+              {flowStats.topEmitters.length > 0 && (
+                <div className="bg-[#0f1016] border border-[#2e2f3a] rounded-xl p-3 space-y-2">
+                  <p className="text-[#4b5563] text-xs uppercase tracking-widest">Top émetteurs</p>
+                  {flowStats.topEmitters.map((c, i) => (
+                    <div key={c.city} className="flex items-center gap-2">
+                      <span className="text-sm shrink-0">{MEDALS[i]}</span>
+                      <CityRow city={c.city} volume={c.volume} count={c.count} countryCode={c.countryCode} accent="text-[#ff8f00]" />
+                    </div>
+                  ))}
+                </div>
+              )}
+
+              {/* Top récepteurs */}
+              {flowStats.topReceivers.length > 0 && (
+                <div className="bg-[#0f1016] border border-[#2e2f3a] rounded-xl p-3 space-y-2">
+                  <p className="text-[#4b5563] text-xs uppercase tracking-widest">Top récepteurs</p>
+                  {flowStats.topReceivers.map((c, i) => (
+                    <div key={c.city} className="flex items-center gap-2">
+                      <span className="text-sm shrink-0">{MEDALS[i]}</span>
+                      <CityRow city={c.city} volume={c.volume} count={c.count} countryCode={c.countryCode} accent="text-[#00acc1]" />
+                    </div>
+                  ))}
+                </div>
+              )}
+
+              {/* Balance nette */}
+              {flowStats.netBalance.length > 0 && (
+                <div className="bg-[#0f1016] border border-[#2e2f3a] rounded-xl p-3 space-y-1.5">
+                  <p className="text-[#4b5563] text-xs uppercase tracking-widest">Balance nette</p>
+                  {flowStats.netBalance.map((c) => (
+                    <div key={c.city} className="flex items-center justify-between">
+                      <span className="text-white text-xs truncate">{c.city}</span>
+                      <span className={`text-xs font-mono shrink-0 ml-2 ${c.net >= 0 ? 'text-[#00acc1]' : 'text-[#ff8f00]'}`}>
+                        {c.net >= 0 ? '+' : ''}{Math.round(c.net).toLocaleString('fr-FR')} Ğ1
+                      </span>
+                    </div>
+                  ))}
+                </div>
+              )}
+
+              {/* Ville focus */}
+              {focusCity && (
+                <div className="bg-[#0f1016] border border-[#d4a843]/30 rounded-xl p-3">
+                  <p className="text-[#4b5563] text-xs uppercase tracking-widest mb-1">Ville sélectionnée</p>
+                  <p className="text-[#d4a843] text-sm font-medium">{focusCity}</p>
+                  <p className="text-[#4b5563] text-xs mt-0.5">
+                    <span className="text-[#ff8f00]">■</span> sortants &nbsp;
+                    <span className="text-[#00acc1]">■</span> entrants
+                  </p>
+                </div>
+              )}
+            </div>
+          ) : (
+            <p className="text-[#4b5563] text-xs">Aucun arc à afficher.</p>
+          )}
+        </>
       )}
 
       {/* Footer */}

src/data/arcData.ts

@@ -0,0 +1,120 @@
+import type { Transaction } from './mockData';
+
+export interface TransactionArc {
+  id:          string;
+  timestamp:   number;    // Unix ms
+  amount:      number;    // Ğ1
+  fromLat:     number;
+  fromLng:     number;
+  fromCity:    string;
+  fromCountry: string;
+  fromKey:     string;
+  toLat:       number;
+  toLng:       number;
+  toCity:      string;
+  toCountry:   string;
+  toKey:       string;
+}
+
+/** Corridor agrégé par paire de villes (fromCity → toCity). */
+export interface Corridor {
+  fromCity:    string;
+  fromLat:     number;
+  fromLng:     number;
+  fromCountry: string;
+  toCity:      string;
+  toLat:       number;
+  toLng:       number;
+  toCountry:   string;
+  totalVolume: number;
+  count:       number;
+}
+
+export interface FlowStats {
+  totalVolume:  number;
+  arcCount:     number;
+  topEmitters:  { city: string; volume: number; count: number; countryCode: string }[];
+  topReceivers: { city: string; volume: number; count: number; countryCode: string }[];
+  netBalance:   { city: string; net: number; countryCode: string }[];
+}
+
+/** Agrège les arcs individuels en corridors ville→ville, triés par volume. */
+export function buildCorridors(arcs: TransactionArc[]): Corridor[] {
+  const map = new Map<string, Corridor>();
+  for (const arc of arcs) {
+    const key = `${arc.fromCity}||${arc.toCity}`;
+    if (!map.has(key)) {
+      map.set(key, {
+        fromCity: arc.fromCity, fromLat: arc.fromLat, fromLng: arc.fromLng, fromCountry: arc.fromCountry,
+        toCity:   arc.toCity,   toLat:   arc.toLat,   toLng:   arc.toLng,   toCountry:   arc.toCountry,
+        totalVolume: 0, count: 0,
+      });
+    }
+    const c = map.get(key)!;
+    c.totalVolume += arc.amount;
+    c.count++;
+  }
+  return [...map.values()].sort((a, b) => b.totalVolume - a.totalVolume);
+}
+
+export function computeFlowStats(arcs: TransactionArc[]): FlowStats {
+  const emitters  = new Map<string, { volume: number; count: number; country: string }>();
+  const receivers = new Map<string, { volume: number; count: number; country: string }>();
+
+  for (const arc of arcs) {
+    if (!emitters.has(arc.fromCity))  emitters.set(arc.fromCity,  { volume: 0, count: 0, country: arc.fromCountry });
+    if (!receivers.has(arc.toCity))   receivers.set(arc.toCity,   { volume: 0, count: 0, country: arc.toCountry });
+    emitters.get(arc.fromCity)!.volume  += arc.amount;
+    emitters.get(arc.fromCity)!.count++;
+    receivers.get(arc.toCity)!.volume   += arc.amount;
+    receivers.get(arc.toCity)!.count++;
+  }
+
+  const allCities = new Set([...emitters.keys(), ...receivers.keys()]);
+  const netBalance = [...allCities].map(city => ({
+    city,
+    net:         (receivers.get(city)?.volume ?? 0) - (emitters.get(city)?.volume ?? 0),
+    countryCode: emitters.get(city)?.country ?? receivers.get(city)?.country ?? '',
+  })).sort((a, b) => Math.abs(b.net) - Math.abs(a.net)).slice(0, 5);
+
+  return {
+    totalVolume:  arcs.reduce((s, a) => s + a.amount, 0),
+    arcCount:     arcs.length,
+    topEmitters:  [...emitters.entries()].sort((a, b) => b[1].volume - a[1].volume).slice(0, 3)
+      .map(([city, d]) => ({ city, volume: d.volume, count: d.count, countryCode: d.country })),
+    topReceivers: [...receivers.entries()].sort((a, b) => b[1].volume - a[1].volume).slice(0, 3)
+      .map(([city, d]) => ({ city, volume: d.volume, count: d.count, countryCode: d.country })),
+    netBalance,
+  };
+}
+
+/**
+ * Génère des arcs mock : chaque transaction devient un arc dont le destinataire
+ * est une transaction aléatoire d'une ville différente.
+ */
+export function buildMockArcs(transactions: Transaction[]): TransactionArc[] {
+  if (transactions.length < 2) return [];
+  const arcs: TransactionArc[] = [];
+  for (let i = 0; i < transactions.length; i++) {
+    if (Math.random() > 0.55) continue; // ~55 % de couverture
+    const from = transactions[i];
+    let toIdx = Math.floor(Math.random() * transactions.length);
+    for (let tries = 0; tries < 8 && transactions[toIdx].city === from.city; tries++) {
+      toIdx = Math.floor(Math.random() * transactions.length);
+    }
+    const to = transactions[toIdx];
+    if (to.city === from.city) continue;
+    arcs.push({
+      id:          `${from.id}-arc`,
+      timestamp:   from.timestamp,
+      amount:      from.amount,
+      fromLat: from.lat, fromLng: from.lng,
+      fromCity: from.city, fromCountry: from.countryCode,
+      fromKey: from.fromKey,
+      toLat: to.lat, toLng: to.lng,
+      toCity: to.city, toCountry: to.countryCode,
+      toKey: to.toKey,
+    });
+  }
+  return arcs;
+}

src/hooks/useAnimation.ts

@@ -1,5 +1,6 @@
 import { useState, useMemo, useEffect } from 'react';
 import type { Transaction } from '../data/mockData';
+import type { TransactionArc } from '../data/arcData';
 
 export interface TimeFrame {
   label: string;
@@ -56,7 +57,7 @@ function buildFrames(periodDays: number): TimeFrame[] {
   return frames;
 }
 
-export function useAnimation(transactions: Transaction[], periodDays: number, allTimestamps: number[] = []) {
+export function useAnimation(transactions: Transaction[], arcs: TransactionArc[], periodDays: number, allTimestamps: number[] = []) {
   const [active, setActive] = useState(false);
   const [currentIndex, setCurrentIndex] = useState(0);
   const [playing, setPlaying] = useState(false);
@@ -95,6 +96,13 @@ export function useAnimation(transactions: Transaction[], periodDays: number, al
     return transactions.filter((t) => t.timestamp >= frame.from && t.timestamp < frame.to);
   }, [active, transactions, frames, currentIndex]);
 
+  const visibleArcs = useMemo(() => {
+    if (!active || frames.length === 0) return arcs;
+    const frame = frames[currentIndex];
+    if (!frame) return arcs;
+    return arcs.filter((a) => a.timestamp >= frame.from && a.timestamp < frame.to);
+  }, [active, arcs, frames, currentIndex]);
+
   // Nombre total de transfers (géo + non-géo) dans la frame courante
   const frameTotalCount = useMemo(() => {
     if (!active || frames.length === 0 || allTimestamps.length === 0) return null;
@@ -117,6 +125,7 @@ export function useAnimation(transactions: Transaction[], periodDays: number, al
     frames,
     currentFrame: frames[currentIndex] ?? null,
     visibleTransactions,
+    visibleArcs,
     frameTotalCount,
   };
 }

src/services/DataService.ts

@@ -13,12 +13,16 @@
  */
 
 import { fetchTransfers, buildIdentityKeyMap, fetchCurrentUD } from './adapters/SubsquidAdapter';
-import { resolveGeoByKeys } from './adapters/CesiumAdapter';
+import { resolveGeoByKeys, cleanCityName } from './adapters/CesiumAdapter';
 import {
   getTransactionsForPeriod,
   computeStats,
   type Transaction,
 } from '../data/mockData';
+import {
+  buildMockArcs,
+  type TransactionArc,
+} from '../data/arcData';
 
 const USE_LIVE_API = import.meta.env.VITE_USE_LIVE_API === 'true';
 
@@ -43,15 +47,16 @@ async function getIdentityKeyMap(): Promise<Map<string, string>> {
 }
 
 async function fetchLiveTransactions(periodDays: number): Promise<{
-  geolocated: Transaction[];
+  geolocated:    Transaction[];
-  totalCount: number;
+  arcs:          TransactionArc[];
-  totalVolume: number;
+  totalCount:    number;
+  totalVolume:   number;
   allTimestamps: number[];
 }> {
   // ~400 tx/jour sur le réseau Ğ1v2 → marge ×1.5 arrondie, minimum 2000
   const limit = Math.max(2000, Math.ceil(periodDays * 600));
   const { transfers: rawTransfers, totalCount } = await fetchTransfers(periodDays, limit);
-  if (rawTransfers.length === 0) return { geolocated: [], totalCount: 0, totalVolume: 0, allTimestamps: [] };
+  if (rawTransfers.length === 0) return { geolocated: [], arcs: [], totalCount: 0, totalVolume: 0, allTimestamps: [] };
 
   const totalVolume = rawTransfers.reduce((s, t) => s + t.amount, 0);
 
@@ -63,15 +68,16 @@ async function fetchLiveTransactions(periodDays: number): Promise<{
     console.warn('Identity key map indisponible :', err);
   }
 
-  // Clés Duniter uniques des émetteurs
+  // Clés Duniter uniques des émetteurs ET destinataires (un seul appel Cesium+)
-  const duniterKeys = [...new Set(
+  const allDuniterKeys = [...new Set([
-    rawTransfers.map((t) => keyMap.get(t.fromId)).filter(Boolean) as string[]
+    ...rawTransfers.map((t) => keyMap.get(t.fromId)),
-  )];
+    ...rawTransfers.map((t) => keyMap.get(t.toId)),
+  ].filter(Boolean) as string[])];
 
   // Résolution géo par clé Duniter (_id Cesium+)
   let geoMap = new Map<string, { lat: number; lng: number; city: string; countryCode: string }>();
   try {
-    const profiles = await resolveGeoByKeys(duniterKeys);
+    const profiles = await resolveGeoByKeys(allDuniterKeys);
     for (const [key, p] of profiles) {
       geoMap.set(key, { lat: p.lat, lng: p.lng, city: p.city, countryCode: p.countryCode });
     }
@@ -79,28 +85,53 @@ async function fetchLiveTransactions(periodDays: number): Promise<{
     console.warn('Cesium+ indisponible :', err);
   }
 
-  // Seules les transactions avec un profil géo entrent dans le heatmap
+  const geolocated: Transaction[]   = [];
-  const geolocated: Transaction[] = [];
+  const arcs:       TransactionArc[] = [];
-  for (const t of rawTransfers) {
-    const duniterKey = keyMap.get(t.fromId);
-    if (!duniterKey) continue;
-    const geo = geoMap.get(duniterKey);
-    if (!geo) continue;
 
+  for (const t of rawTransfers) {
+    const fromDuniterKey = keyMap.get(t.fromId);
+    if (!fromDuniterKey) continue;
+    const fromGeo = geoMap.get(fromDuniterKey);
+    if (!fromGeo) continue;
+
+    const fromCity = cleanCityName(fromGeo.city);
+
+    // Heatmap : émetteur géolocalisé
     geolocated.push({
       id:          t.id,
       timestamp:   t.timestamp,
-      lat:         geo.lat,
+      lat:         fromGeo.lat,
-      lng:         geo.lng,
+      lng:         fromGeo.lng,
       amount:      t.amount,
-      city:        geo.city,
+      city:        fromCity,
-      countryCode: geo.countryCode,
+      countryCode: fromGeo.countryCode,
       fromKey:     t.fromId,
       toKey:       t.toId,
     });
+
+    // Arc : les deux extrémités géolocalisées + villes différentes
+    const toDuniterKey = keyMap.get(t.toId);
+    if (!toDuniterKey) continue;
+    const toGeo = geoMap.get(toDuniterKey);
+    if (!toGeo) continue;
+
+    const toCity = cleanCityName(toGeo.city);
+    if (fromCity === toCity) continue;
+
+    arcs.push({
+      id:          `${t.id}-arc`,
+      timestamp:   t.timestamp,
+      amount:      t.amount,
+      fromLat: fromGeo.lat, fromLng: fromGeo.lng,
+      fromCity,             fromCountry: fromGeo.countryCode,
+      fromKey: t.fromId,
+      toLat: toGeo.lat,     toLng: toGeo.lng,
+      toCity,               toCountry: toGeo.countryCode,
+      toKey: t.toId,
+    });
   }
 
-  return { geolocated, totalCount, totalVolume, allTimestamps: rawTransfers.map((t) => t.timestamp) };
+  return { geolocated, arcs, totalCount, totalVolume, allTimestamps: rawTransfers.map((t) => t.timestamp) };
 }
 
 // ---------------------------------------------------------------------------
@@ -114,11 +145,12 @@ export interface PeriodStats {
 }
 
 export interface DataResult {
-  transactions:  Transaction[];  // uniquement géolocalisées → heatmap
+  transactions:  Transaction[];    // uniquement géolocalisées → heatmap
+  arcs:          TransactionArc[]; // les deux extrémités géolocalisées → vue flux
   stats:         PeriodStats;
   source:        'live' | 'mock';
-  currentUD:     number;         // valeur du DU courant en Ğ1
+  currentUD:     number;           // valeur du DU courant en Ğ1
-  allTimestamps: number[];       // timestamps de TOUS les transfers (géo + non-géo)
+  allTimestamps: number[];         // timestamps de TOUS les transfers (géo + non-géo)
 }
 
 export async function fetchData(periodDays: number): Promise<DataResult> {
@@ -126,8 +158,10 @@ export async function fetchData(periodDays: number): Promise<DataResult> {
     await new Promise((r) => setTimeout(r, 80));
     const transactions = getTransactionsForPeriod(periodDays);
     const base = computeStats(transactions);
+    const arcs = buildMockArcs(transactions);
     return {
       transactions,
+      arcs,
       stats: { ...base, geoCount: transactions.length },
       source: 'mock',
       currentUD: 11.78,
@@ -135,7 +169,7 @@ export async function fetchData(periodDays: number): Promise<DataResult> {
     };
   }
 
-  const [{ geolocated, totalCount, totalVolume, allTimestamps }, currentUD] = await Promise.all([
+  const [{ geolocated, arcs, totalCount, totalVolume, allTimestamps }, currentUD] = await Promise.all([
     fetchLiveTransactions(periodDays),
     getCurrentUD(),
   ]);
@@ -143,6 +177,7 @@ export async function fetchData(periodDays: number): Promise<DataResult> {
 
   return {
     transactions: geolocated,
+    arcs,
     stats: {
       totalVolume,
       transactionCount: totalCount,