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import { runQuery } from "@/lib/neo4j";
import {
LABEL_LAYER,
LAYER_COLORS,
NODE_ROLE_COLORS,
LABEL_SORT_ORDER,
LABEL_GROUP,
PERSONA_VIEWS,
type PersonaId,
} from "@/lib/graph-constants";
export const dynamic = "force-dynamic";
// Governance + catalog labels — always included in researcher overview
const GOVERNANCE_LABELS = [
"Participant",
"DataProduct",
"OdrlPolicy",
"Contract",
"HDABApproval",
"ContractNegotiation",
"HealthDataset",
"Distribution",
"EEHRxFProfile",
"VerifiableCredential",
"TransferEvent",
"EhdsPurpose",
"Catalogue",
"Organization",
"TrustCenter",
"SPESession",
];
function toNode(r: { id: string; labels: string[]; name: string }) {
const label = r.labels[0] ?? "Node";
const layer = r.labels.map((l) => LABEL_LAYER[l]).find(Boolean) ?? 0;
const color = NODE_ROLE_COLORS[label] ?? LAYER_COLORS[layer] ?? "#888";
const group = LABEL_GROUP[label] ?? "other";
const sortKey = LABEL_SORT_ORDER[label] ?? 99;
return {
id: r.id,
name: r.name,
label,
layer,
color,
group,
sortKey,
expandable: true,
};
}
function sortAndDedup(rows: { id: string; labels: string[]; name: string }[]) {
const seen = new Set<string>();
return rows
.filter((r) => (seen.has(r.id) ? false : seen.add(r.id) && true))
.sort((a, b) => {
const la = a.labels.map((l) => LABEL_LAYER[l]).find(Boolean) ?? 0;
const lb = b.labels.map((l) => LABEL_LAYER[l]).find(Boolean) ?? 0;
if (la !== lb) return la - lb;
const sa = LABEL_SORT_ORDER[a.labels[0] ?? ""] ?? 99;
const sb = LABEL_SORT_ORDER[b.labels[0] ?? ""] ?? 99;
if (sa !== sb) return sa - sb;
return (a.name ?? "").localeCompare(b.name ?? "");
})
.map(toNode);
}
// ── Persona-specific subgraph builders ───────────────────────────────────────
/** Trust Center: pseudonym resolution chains + governed datasets + cross-border */
async function buildTrustCenterGraph() {
const [tcNodes, speNodes, rpsnNodes, datasetNodes] = await Promise.all([
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (tc:TrustCenter)
OPTIONAL MATCH (tc)-[:GOVERNED_BY]->(ha:HDABApproval)
WITH tc, ha
RETURN elementId(tc) AS id, labels(tc) AS labels, tc.name AS name
UNION
MATCH (ha:HDABApproval)
RETURN elementId(ha) AS id, labels(ha) AS labels,
coalesce(ha.approvalId, elementId(ha)) AS name`,
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (ss:SPESession)
RETURN elementId(ss) AS id, labels(ss) AS labels,
coalesce(ss.studyId, ss.sessionId, elementId(ss)) AS name
ORDER BY ss.createdAt DESC LIMIT 20`,
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (rp:ResearchPseudonym {revoked: false})
RETURN elementId(rp) AS id, labels(rp) AS labels,
coalesce(rp.studyId, rp.rpsnId, elementId(rp)) AS name
LIMIT 20
UNION
MATCH (pp:ProviderPseudonym)
RETURN elementId(pp) AS id, labels(pp) AS labels,
coalesce(pp.providerId, pp.psnId, elementId(pp)) AS name
LIMIT 20`,
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (tc:TrustCenter)-[:RESOLVES_PSEUDONYMS_FOR]->(ds:HealthDataset)
RETURN elementId(ds) AS id, labels(ds) AS labels,
coalesce(ds.title, ds.datasetId, elementId(ds)) AS name`,
),
]);
return sortAndDedup([...tcNodes, ...speNodes, ...rpsnNodes, ...datasetNodes]);
}
/** Hospital / Data Holder: their datasets, data products, active contracts, who has access */
async function buildHospitalGraph() {
const [
participantNodes,
datasetNodes,
productNodes,
contractNodes,
credNodes,
] = await Promise.all([
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (p:Participant)
RETURN elementId(p) AS id, labels(p) AS labels,
coalesce(p.name, p.participantId, elementId(p)) AS name
ORDER BY p.name`,
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (ds:HealthDataset)
RETURN elementId(ds) AS id, labels(ds) AS labels,
coalesce(ds.title, ds.datasetId, elementId(ds)) AS name
ORDER BY ds.title LIMIT 30
UNION
MATCH (d:Distribution)
RETURN elementId(d) AS id, labels(d) AS labels,
coalesce(d.name, d.title, d.format, d.distributionId, elementId(d)) AS name
LIMIT 20
UNION
MATCH (ep:EEHRxFProfile)
RETURN elementId(ep) AS id, labels(ep) AS labels,
coalesce(ep.title, ep.profileId, elementId(ep)) AS name
LIMIT 15`,
),
// DataProduct — the offerings participants publish
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (dp:DataProduct)
RETURN elementId(dp) AS id, labels(dp) AS labels,
coalesce(dp.name, dp.title, dp.productId, elementId(dp)) AS name
LIMIT 20`,
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (c:Contract)
RETURN elementId(c) AS id, labels(c) AS labels,
coalesce(c.name, c.contractId, elementId(c)) AS name
UNION
MATCH (ha:HDABApproval)
RETURN elementId(ha) AS id, labels(ha) AS labels,
coalesce(ha.name, ha.approvalId, elementId(ha)) AS name
UNION
MATCH (aa:AccessApplication)
RETURN elementId(aa) AS id, labels(aa) AS labels,
coalesce(aa.name, aa.applicationId, elementId(aa)) AS name`,
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (vc:VerifiableCredential)
RETURN elementId(vc) AS id, labels(vc) AS labels,
coalesce(vc.credentialType, vc.credentialId, elementId(vc)) AS name
ORDER BY vc.credentialType LIMIT 20`,
),
]);
return sortAndDedup([
...participantNodes,
...datasetNodes,
...productNodes,
...contractNodes,
...credNodes,
]);
}
/** Researcher: datasets + OMOP analytics + pseudonym chain + clinical conditions */
async function buildResearcherGraph() {
const [datasetNodes, omopNodes, conditionNodes, ontologyNodes, speNodes] =
await Promise.all([
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (ds:HealthDataset)
RETURN elementId(ds) AS id, labels(ds) AS labels,
coalesce(ds.title, ds.datasetId, elementId(ds)) AS name
ORDER BY ds.title LIMIT 20
UNION
MATCH (dp:DataProduct)
RETURN elementId(dp) AS id, labels(dp) AS labels,
coalesce(dp.name, dp.productId, elementId(dp)) AS name
LIMIT 15
UNION
MATCH (ep:EEHRxFProfile)
RETURN elementId(ep) AS id, labels(ep) AS labels,
coalesce(ep.title, ep.profileId, elementId(ep)) AS name
LIMIT 10`,
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (op:OMOPPerson)-[:HAS_CONDITION_OCCURRENCE]->(:OMOPConditionOccurrence)
WITH op, count(*) AS cnt ORDER BY cnt DESC LIMIT 15
RETURN elementId(op) AS id, labels(op) AS labels,
coalesce(op.name, toString(op.personId), elementId(op)) AS name
UNION
MATCH (oc:OMOPConditionOccurrence)<-[:HAS_CONDITION_OCCURRENCE]-(:OMOPPerson)
WITH oc, count(*) AS freq ORDER BY freq DESC LIMIT 30
RETURN elementId(oc) AS id, labels(oc) AS labels,
coalesce(oc.name, toString(oc.conditionConceptId), elementId(oc)) AS name
UNION
MATCH (om:OMOPMeasurement)
RETURN elementId(om) AS id, labels(om) AS labels,
coalesce(om.name, toString(om.measurementConceptId), elementId(om)) AS name
LIMIT 10`,
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (c:Condition)<-[:HAS_CONDITION]-(:Patient)
WITH c, count(*) AS freq ORDER BY freq DESC LIMIT 30
RETURN elementId(c) AS id, labels(c) AS labels,
coalesce(c.display, c.name, c.code, elementId(c)) AS name`,
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (s:SnomedConcept)
WITH s, count{(s)-[]-()} AS deg ORDER BY deg DESC LIMIT 20
RETURN elementId(s) AS id, labels(s) AS labels,
coalesce(s.display, s.code, elementId(s)) AS name
UNION
MATCH (l:LoincCode)
WITH l, count{(l)-[]-()} AS deg ORDER BY deg DESC LIMIT 10
RETURN elementId(l) AS id, labels(l) AS labels,
coalesce(l.display, l.code, elementId(l)) AS name
UNION
MATCH (rx:RxNormConcept)
WITH rx, count{(rx)-[]-()} AS deg ORDER BY deg DESC LIMIT 10
RETURN elementId(rx) AS id, labels(rx) AS labels,
coalesce(rx.display, rx.name, rx.code, elementId(rx)) AS name`,
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (rp:ResearchPseudonym {revoked: false})
RETURN elementId(rp) AS id, labels(rp) AS labels,
coalesce(rp.studyId, rp.rpsnId, elementId(rp)) AS name
LIMIT 10
UNION
MATCH (ss:SPESession {status: "active"})
RETURN elementId(ss) AS id, labels(ss) AS labels,
coalesce(ss.studyId, ss.sessionId, elementId(ss)) AS name
LIMIT 10`,
),
]);
return sortAndDedup([
...datasetNodes,
...omopNodes,
...conditionNodes,
...ontologyNodes,
...speNodes,
]);
}
/** EDC Admin: all participants, products, contracts, negotiations, transfers */
async function buildEdcAdminGraph() {
const rows = await runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (n)
WHERE any(l IN labels(n) WHERE l IN $labels)
RETURN elementId(n) AS id, labels(n) AS labels,
coalesce(n.name, n.title, n.display, n.participantId, n.productId,
n.contractId, n.credentialType, n.transferId,
n.endpoint + ' ' + n.method, n.endpoint,
n.eventId, n.id, elementId(n)) AS name
ORDER BY labels(n)[0], coalesce(n.name, n.display, n.id)`,
{
labels: [
"Participant",
"Organization",
"DataProduct",
"OdrlPolicy",
"Contract",
"ContractNegotiation",
"DataTransfer",
"TransferEvent",
"VerifiableCredential",
],
},
);
return sortAndDedup(rows);
}
/** HDAB Authority: approval chains, credentials, trust center governance */
async function buildHdabGraph() {
const [govNodes, tcNodes, vcNodes] = await Promise.all([
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (n)
WHERE any(l IN labels(n) WHERE l IN $labels)
RETURN elementId(n) AS id, labels(n) AS labels,
coalesce(n.name, n.display, n.title, n.approvalId, n.applicationId,
n.contractId, n.productId, n.participantId, elementId(n)) AS name
ORDER BY labels(n)[0]`,
{
labels: [
"HDABApproval",
"AccessApplication",
"OdrlPolicy",
"Participant",
"DataProduct",
"Contract",
],
},
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (tc:TrustCenter)
RETURN elementId(tc) AS id, labels(tc) AS labels, tc.name AS name
UNION
MATCH (ss:SPESession)
RETURN elementId(ss) AS id, labels(ss) AS labels,
coalesce(ss.studyId, ss.sessionId, elementId(ss)) AS name
LIMIT 15`,
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (vc:VerifiableCredential)
RETURN elementId(vc) AS id, labels(vc) AS labels,
coalesce(vc.credentialType, vc.credentialId, elementId(vc)) AS name
ORDER BY vc.credentialType LIMIT 30`,
),
]);
return sortAndDedup([...govNodes, ...tcNodes, ...vcNodes]);
}
/** Patient: own FHIR data + governance chain showing who uses it (EHDS Art. 3-12) */
async function buildPatientGraph() {
const [patientNodes, conditionNodes, omopNodes, speNodes, govNodes] =
await Promise.all([
// Top 20 patients with richest records (GDPR Art. 15 — access own data)
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (p:Patient)-[:HAS_CONDITION]->(:Condition)
WITH p, count(*) AS cnt ORDER BY cnt DESC LIMIT 20
RETURN elementId(p) AS id, labels(p) AS labels,
coalesce(p.name, p.id, elementId(p)) AS name`,
{},
),
// Their top conditions — display name before code
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (c:Condition)<-[:HAS_CONDITION]-(:Patient)
WITH c, count(*) AS freq ORDER BY freq DESC LIMIT 30
RETURN elementId(c) AS id, labels(c) AS labels,
coalesce(c.display, c.code, elementId(c)) AS name`,
{},
),
// OMOP CDM: persons only (condition occurrences use numeric IDs unhelpful to patients)
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (op:OMOPPerson)
RETURN elementId(op) AS id, labels(op) AS labels,
coalesce(op.name, toString(op.personId), elementId(op)) AS name
LIMIT 15`,
{},
),
// Research pseudonyms, SPE sessions, consents (EHDS Art. 10 secondary use)
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (rp:ResearchPseudonym {revoked: false})
RETURN elementId(rp) AS id, labels(rp) AS labels,
coalesce(rp.studyId, rp.rpsnId, elementId(rp)) AS name
LIMIT 10
UNION
MATCH (ss:SPESession)
RETURN elementId(ss) AS id, labels(ss) AS labels,
coalesce(ss.studyId, ss.sessionId, elementId(ss)) AS name
LIMIT 5
UNION
MATCH (pc:PatientConsent {revoked: false})
RETURN elementId(pc) AS id, labels(pc) AS labels,
coalesce(pc.studyId, pc.consentId, elementId(pc)) AS name
LIMIT 10`,
{},
),
// Data consumers — who has access to the data (GDPR Art. 15 transparency)
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (p:Participant)
RETURN elementId(p) AS id, labels(p) AS labels,
coalesce(p.name, p.participantId, elementId(p)) AS name
ORDER BY p.name
UNION
MATCH (dp:DataProduct)
RETURN elementId(dp) AS id, labels(dp) AS labels,
coalesce(dp.name, dp.productId, elementId(dp)) AS name
LIMIT 15
UNION
MATCH (ha:HDABApproval)
RETURN elementId(ha) AS id, labels(ha) AS labels,
coalesce(ha.approvalId, elementId(ha)) AS name
LIMIT 10`,
{},
),
]);
return sortAndDedup([
...govNodes,
...patientNodes,
...conditionNodes,
...omopNodes,
...speNodes,
]);
}
// ── Default overview (unchanged from before) ─────────────────────────────────
async function buildDefaultGraph() {
const [
govNodes,
patientNodes,
conditionNodes,
snomedNodes,
loincNodes,
rxnormNodes,
] = await Promise.all([
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (n) WHERE any(l IN labels(n) WHERE l IN $labels)
RETURN elementId(n) AS id, labels(n) AS labels,
coalesce(n.name, n.title, n.display, n.participantId,
n.productId, n.credentialType, n.transferId,
n.endpoint + ' ' + n.method, n.endpoint,
n.eventId, n.code, n.id, elementId(n)) AS name
ORDER BY labels(n)[0], coalesce(n.name, n.display, n.id)`,
{ labels: GOVERNANCE_LABELS },
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (p:Patient)-[:HAS_CONDITION]->(:Condition)
WITH p, count(*) AS cnt ORDER BY cnt DESC LIMIT 20
RETURN elementId(p) AS id, labels(p) AS labels,
coalesce(p.name, p.id, elementId(p)) AS name`,
{},
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (c:Condition)<-[:HAS_CONDITION]-(:Patient)
WITH c, count(*) AS freq ORDER BY freq DESC LIMIT 50
RETURN elementId(c) AS id, labels(c) AS labels,
coalesce(c.display, c.name, c.code, elementId(c)) AS name`,
{},
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (s:SnomedConcept)
WITH s, count{(s)-[]-()} AS deg ORDER BY deg DESC LIMIT 30
RETURN elementId(s) AS id, labels(s) AS labels,
coalesce(s.display, s.code, elementId(s)) AS name`,
{},
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (l:LoincCode)
WITH l, count{(l)-[]-()} AS deg ORDER BY deg DESC LIMIT 20
RETURN elementId(l) AS id, labels(l) AS labels,
coalesce(l.display, l.code, elementId(l)) AS name`,
{},
),
runQuery<{ id: string; labels: string[]; name: string }>(
`MATCH (r:RxNormConcept)
WITH r, count{(r)-[]-()} AS deg ORDER BY deg DESC LIMIT 20
RETURN elementId(r) AS id, labels(r) AS labels,
coalesce(r.display, r.name, r.code, elementId(r)) AS name`,
{},
),
]);
return sortAndDedup([
...govNodes,
...patientNodes,
...conditionNodes,
...snomedNodes,
...loincNodes,
...rxnormNodes,
]);
}
// ── Route handler ─────────────────────────────────────────────────────────────
/**
* GET /api/graph?persona=<id>
*
* Returns a persona-specific subgraph. Supported personas:
* default — full researcher overview (~200 nodes)
* trust-center — TC operator: pseudonym chains + governed datasets
* hospital — data holder: datasets + contracts + credentials
* researcher — data user: OMOP + datasets + clinical conditions
* edc-admin — operator: participants + products + transfers
* hdab — authority: approvals + credentials + TC governance
*/
// Public endpoint — the /graph page is the demo landing view and must
// work without authentication. Data is fully synthetic (127 fictional
// patients seeded from Synthea).
export async function GET(req: Request) {
const { searchParams } = new URL(req.url);
const persona = (searchParams.get("persona") ?? "default") as PersonaId;
// Validate persona
const validPersonas = PERSONA_VIEWS.map((p) => p.id);
const safePersona = validPersonas.includes(persona) ? persona : "default";
try {
let nodes;
switch (safePersona) {
case "trust-center":
nodes = await buildTrustCenterGraph();
break;
case "hospital":
nodes = await buildHospitalGraph();
break;
case "researcher":
nodes = await buildResearcherGraph();
break;
case "edc-admin":
nodes = await buildEdcAdminGraph();
break;
case "hdab":
nodes = await buildHdabGraph();
break;
case "patient":
nodes = await buildPatientGraph();
break;
default:
nodes = await buildDefaultGraph();
}
const links = await runQuery<{
source: string;
target: string;
type: string;
}>(
`MATCH (a)-[r]->(b)
WHERE elementId(a) IN $ids AND elementId(b) IN $ids
RETURN DISTINCT elementId(a) AS source, elementId(b) AS target, type(r) AS type`,
{ ids: nodes.map((n) => n.id) },
);
const personaMeta = PERSONA_VIEWS.find((p) => p.id === safePersona);
return NextResponse.json({
nodes,
links,
persona: safePersona,
question: personaMeta?.question,
});
} catch (err) {
const msg = err instanceof Error ? err.message : String(err);
const code =
err && typeof err === "object" && "code" in err
? String((err as { code?: unknown }).code ?? "")
: "";
console.error("GET /api/graph error:", {
message: msg,
code,
uri: process.env.NEO4J_URI ?? "(unset)",
});
return NextResponse.json(
{
error: "Neo4j unavailable",
detail: msg,
code,
},
{ status: 502 },
);
}
}
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