feat(graph): improve note graph relationships by integrating wikilinks and semantic AI echo insights

memento-note/app/api/graph/route.ts

@@ -36,7 +36,7 @@ function jaccardSimilarity(a: Set<string>, b: Set<string>): number {
   return intersection / (a.size + b.size - intersection)
 }
 
-type EdgeType = 'title_mention' | 'shared_label' | 'jaccard'
+type EdgeType = 'title_mention' | 'shared_label' | 'jaccard' | 'explicit_link' | 'semantic_echo'
 
 interface GraphEdge { source: string; target: string; weight: number; type: EdgeType }
 
@@ -62,6 +62,35 @@ export async function GET(request: NextRequest) {
 
   const ids = notes.map(n => n.id)
 
+  // Query NoteLink manually created relationships
+  const noteLinks = await (prisma as any).noteLink.findMany({
+    where: {
+      sourceNoteId: { in: ids },
+      targetNoteId: { in: ids }
+    },
+    select: {
+      sourceNoteId: true,
+      targetNoteId: true,
+      contextSnippet: true
+    }
+  })
+
+  // Query MemoryEchoInsight semantic relationships
+  const echoInsights = await (prisma as any).memoryEchoInsight.findMany({
+    where: {
+      userId,
+      dismissed: false,
+      note1Id: { in: ids },
+      note2Id: { in: ids }
+    },
+    select: {
+      note1Id: true,
+      note2Id: true,
+      similarityScore: true,
+      insight: true
+    }
+  })
+
   // Pré-calcul
   const keywordsMap = new Map<string, Set<string>>()
   const labelMap    = new Map<string, Set<string>>()
@@ -70,11 +99,27 @@ export async function GET(request: NextRequest) {
     labelMap.set(note.id, new Set(note.labelRelations.map((l: any) => l.id)))
   }
 
+  const EDGE_TYPE_PRIORITY: Record<EdgeType, number> = {
+    explicit_link: 5,
+    semantic_echo: 4,
+    title_mention: 3,
+    shared_label: 2,
+    jaccard: 1,
+  }
+
   const edgeMap = new Map<string, GraphEdge>()
   function upsertEdge(a: string, b: string, weight: number, type: EdgeType) {
     const key = a < b ? `${a}--${b}` : `${b}--${a}`
     const ex = edgeMap.get(key)
-    if (!ex || ex.weight < weight) edgeMap.set(key, { source: a < b ? a : b, target: a < b ? b : a, weight, type })
+    if (!ex) {
+      edgeMap.set(key, { source: a < b ? a : b, target: a < b ? b : a, weight, type })
+    } else {
+      const exPriority = EDGE_TYPE_PRIORITY[ex.type] || 0
+      const curPriority = EDGE_TYPE_PRIORITY[type] || 0
+      if (curPriority > exPriority || (curPriority === exPriority && weight > ex.weight)) {
+        edgeMap.set(key, { source: a < b ? a : b, target: a < b ? b : a, weight, type })
+      }
+    }
   }
 
   // ── Niveau 1 : Title Mention (comme Obsidian "unlinked mentions") ──────────
@@ -113,6 +158,16 @@ export async function GET(request: NextRequest) {
     }
   }
 
+  // ── Niveau 4 : WikiLinks explicites (NoteLink) ─────────────────────────────
+  for (const link of noteLinks) {
+    upsertEdge(link.sourceNoteId, link.targetNoteId, 1.0, 'explicit_link')
+  }
+
+  // ── Niveau 5 : Échos sémantiques IA (MemoryEchoInsight) ────────────────────
+  for (const echo of echoInsights) {
+    upsertEdge(echo.note1Id, echo.note2Id, echo.similarityScore, 'semantic_echo')
+  }
+
   const degreeMap = new Map<string, number>()
   for (const e of edgeMap.values()) {
     degreeMap.set(e.source, (degreeMap.get(e.source) ?? 0) + 1)