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import { fetchApi } from "@/lib/api";
import { useEffect, useMemo, useState } from "react";
import {
Activity,
Heart,
Stethoscope,
FlaskConical,
Pill,
Scissors,
Users,
} from "lucide-react";
import PageIntro from "@/components/PageIntro";
import { SignInRequired } from "@/components/SignInRequired";
interface PatientListItem {
id: string;
name: string;
gender: string;
birthDate: string;
}
interface CohortStats {
patients: number;
encounters: number;
conditions: number;
observations: number;
medications: number;
procedures: number;
}
interface TimelineEntry {
fhirType: string;
fhirId: string;
date: string;
display: string;
omopType: string;
omopId: string;
}
/* WCAG-safe FHIR type colours — ≥4.5:1 on white (light) and on #0b1326 (dark) */
const FHIR_TYPE_TOKENS: Record<
string,
{ text: string; bg: string; icon: React.ReactNode }
> = {
Encounter: {
text: "var(--fhir-encounter)",
bg: "var(--role-holder-bg)",
icon: <Stethoscope size={12} />,
},
Condition: {
text: "var(--fhir-condition)",
bg: "var(--role-user-bg)",
icon: <Activity size={12} />,
},
Observation: {
text: "var(--fhir-observation)",
bg: "var(--role-user-bg)",
icon: <FlaskConical size={12} />,
},
MedicationRequest: {
text: "var(--fhir-medication)",
bg: "var(--role-hdab-bg)",
icon: <Pill size={12} />,
},
Procedure: {
text: "var(--fhir-procedure)",
bg: "var(--role-trust-bg)",
icon: <Scissors size={12} />,
},
};
/* Metric orb stat card — Stitch patient_dashboard_day pattern */
function MetricCard({
label,
value,
isOrb = false,
icon,
sub,
}: {
label: string;
value?: number;
isOrb?: boolean;
icon: React.ReactNode;
sub?: string;
}) {
return (
<div className="surface-card p-5 flex items-start justify-between gap-3 border border-[var(--border)]">
<div className="min-w-0 flex-1">
<p className="section-label mb-1 break-words">{label}</p>
<p className="text-3xl font-black text-[var(--text-primary)] leading-none tracking-tight">
{value != null ? value.toLocaleString() : "—"}
</p>
{sub && (
<p className="text-xs text-[var(--text-secondary)] mt-1">{sub}</p>
)}
</div>
{isOrb ? (
<div className="metric-orb">{icon}</div>
) : (
<div className="icon-orb">{icon}</div>
)}
</div>
);
}
export default function PatientPage() {
const [patients, setPatients] = useState<PatientListItem[]>([]);
const [stats, setStats] = useState<CohortStats | null>(null);
const [selected, setSelected] = useState<string>("");
const [timeline, setTimeline] = useState<TimelineEntry[]>([]);
const [loading, setLoading] = useState(true);
const [restricted, setRestricted] = useState(false);
const [unauthenticated, setUnauthenticated] = useState(false);
useEffect(() => {
fetchApi("/api/patient")
.then(async (r) => {
Iif (r.status === 401) throw new Error("UNAUTHENTICATED");
return r.json();
})
.then((d) => {
setPatients(d.patients ?? []);
setStats(d.stats ?? null);
setRestricted(d.restricted === true);
Iif (d.restricted && d.patients?.length === 1) {
setSelected(d.patients[0].id);
}
setLoading(false);
})
.catch((e: Error) => {
Iif (e.message === "UNAUTHENTICATED") setUnauthenticated(true);
setLoading(false);
});
}, []);
useEffect(() => {
if (!selected) return;
setLoading(true);
fetchApi(`/api/patient?patientId=${encodeURIComponent(selected)}`)
.then(async (r) => {
Iif (r.status === 401) throw new Error("UNAUTHENTICATED");
return r.json();
})
.then((d) => {
setTimeline(d.timeline ?? []);
setLoading(false);
})
.catch((e: Error) => {
if (e.message === "UNAUTHENTICATED") setUnauthenticated(true);
setLoading(false);
});
}, [selected]);
const selectedPatient = patients.find((p) => p.id === selected);
/* Group timeline entries by year+month, newest first. Events within each
month are also sorted newest first so the reader scans most recent → oldest. */
const timelineGroups = useMemo(() => {
const dated = timeline.filter((e) => !!e.date);
const undated = timeline.filter((e) => !e.date);
dated.sort((a, b) => (a.date < b.date ? 1 : a.date > b.date ? -1 : 0));
const groups: { key: string; label: string; items: TimelineEntry[] }[] = [];
for (const entry of dated) {
const d = new Date(entry.date);
Iif (Number.isNaN(d.getTime())) continue;
const key = `${d.getUTCFullYear()}-${String(d.getUTCMonth() + 1).padStart(
2,
"0",
)}`;
const existing = groups.find((g) => g.key === key);
Iif (existing) {
existing.items.push(entry);
} else {
groups.push({
key,
label: d.toLocaleString("en-US", {
month: "long",
year: "numeric",
timeZone: "UTC",
}),
items: [entry],
});
}
}
Iif (undated.length) {
groups.push({ key: "undated", label: "Undated", items: undated });
}
return groups;
}, [timeline]);
return (
<div className="min-h-screen bg-[var(--bg)]">
<div className="max-w-4xl mx-auto px-6 py-10">
<PageIntro
title="Patient Journey"
icon={Activity}
description="View individual FHIR R4 clinical events mapped to OMOP CDM concepts. Select a patient to see their encounters, conditions, observations, medications, and procedures in chronological order."
prevStep={{ href: "/catalog", label: "Dataset Catalog" }}
nextStep={{ href: "/analytics", label: "OMOP Analytics" }}
infoText="Patient data is generated by Synthea and loaded into Neo4j as FHIR R4 resources. The OMOP CDM mapping (Layer 4) enables cross-site cohort analysis under EHDS Art. 53."
docLink={{ href: "/docs/architecture", label: "Architecture Docs" }}
/>
{unauthenticated ? (
<SignInRequired description="The Patient Journey view is restricted to authenticated users. Sign in with one of the demo personas to explore FHIR R4 clinical timelines mapped to OMOP CDM concepts." />
) : (
<>
{/* Cohort metric orb cards — Stitch patient_dashboard_day bento */}
{stats && (
<div className="grid grid-cols-2 sm:grid-cols-3 lg:grid-cols-6 gap-4 mb-8">
<MetricCard
label="Patients"
value={stats.patients}
isOrb
icon={<Heart size={20} className="text-white" />}
sub="Synthea cohort"
/>
<MetricCard
label="Encounters"
value={stats.encounters}
icon={<Stethoscope size={18} />}
/>
<MetricCard
label="Conditions"
value={stats.conditions}
icon={<Activity size={18} />}
/>
<MetricCard
label="Observations"
value={stats.observations}
icon={<FlaskConical size={18} />}
/>
<MetricCard
label="Medications"
value={stats.medications}
icon={<Pill size={18} />}
/>
<MetricCard
label="Procedures"
value={stats.procedures}
icon={<Scissors size={18} />}
/>
</div>
)}
{/* Patient selector */}
{restricted ? (
<div className="mb-4 px-4 py-3 bg-[var(--role-patient-bg)] border border-[var(--role-patient-border)] rounded-xl text-sm text-[var(--role-patient-text)] flex items-center gap-2">
<span className="w-2 h-2 rounded-full bg-[var(--role-patient-text)] inline-block animate-pulse" />
Showing your personal health record (EHDS Art. 3 / GDPR Art. 15)
</div>
) : (
<div className="mb-6">
<label className="section-label block">
Select patient
<select
value={selected}
onChange={(e) => setSelected(e.target.value)}
className="mt-1 px-3 py-2.5 bg-[var(--surface-card)] border border-[var(--border-ui)] rounded-xl text-sm outline-none focus:border-[var(--accent)] w-full text-[var(--text-primary)] block"
>
<option value="">
— select patient ({patients.length} loaded) —
</option>
{patients.map((p) => (
<option key={p.id} value={p.id}>
{p.name ?? p.id}
</option>
))}
</select>
</label>
</div>
)}
{/* Patient demographics header */}
{selectedPatient && (
<div className="surface-card p-4 mb-6 flex items-center gap-6 border border-[var(--border)]">
<div className="metric-orb shrink-0">
<Users size={20} className="text-white" />
</div>
<div className="flex gap-6 flex-wrap text-sm">
<div>
<p className="section-label mb-0.5">Name</p>
<p className="font-semibold text-[var(--text-primary)]">
{selectedPatient.name ?? selectedPatient.id}
</p>
</div>
<div>
<p className="section-label mb-0.5">Gender</p>
<p className="font-semibold text-[var(--text-primary)]">
{selectedPatient.gender ?? "—"}
</p>
</div>
<div>
<p className="section-label mb-0.5">Born</p>
<p className="font-semibold text-[var(--text-primary)]">
{selectedPatient.birthDate ?? "—"}
</p>
</div>
<div>
<p className="section-label mb-0.5">Events</p>
<p className="font-semibold text-[var(--text-primary)]">
{timeline.length}
</p>
</div>
</div>
</div>
)}
{loading && (
<p className="text-[var(--text-secondary)] text-sm">Loading…</p>
)}
{!loading && selected && timeline.length === 0 && (
<p className="text-[var(--text-secondary)] text-sm">
No timeline events found for this patient.
</p>
)}
{/* Clinical timeline — grouped by year+month, newest first */}
{timeline.length > 0 && (
<div>
<div className="flex items-baseline justify-between mb-4">
<p className="section-label">Clinical timeline</p>
<p className="text-xs text-[var(--text-secondary)]">
Newest first
</p>
</div>
{timelineGroups.map((group) => (
<section key={group.key} className="mb-6 last:mb-0">
<h3 className="text-sm font-bold text-[var(--text-primary)] mb-3 pb-1 border-b border-[var(--border)] uppercase tracking-wider">
{group.label}
<span className="ml-2 text-xs font-normal text-[var(--text-secondary)] normal-case tracking-normal">
{group.items.length}{" "}
{group.items.length === 1 ? "event" : "events"}
</span>
</h3>
<ol className="activity-timeline space-y-5 pl-8">
{group.items.map((e, i) => {
const token = FHIR_TYPE_TOKENS[e.fhirType];
return (
<li key={`${group.key}-${i}`} className="relative">
{/* Timeline dot */}
<span
className="absolute -left-[1.75rem] top-1 w-3.5 h-3.5 rounded-full border-2 border-[var(--surface-card)] z-10"
style={{
background:
token?.text ?? "var(--text-secondary)",
}}
/>
<div className="surface-card p-4 border border-[var(--border)] hover:shadow-md transition-shadow">
<div className="flex items-start justify-between gap-3 mb-1">
<div className="flex items-center gap-2">
{/* FHIR type badge */}
<span
className="inline-flex items-center gap-1 text-[10px] font-bold px-2 py-0.5 rounded-full"
style={{
color:
token?.text ?? "var(--text-secondary)",
background:
token?.bg ?? "var(--surface-2)",
}}
>
{token?.icon}
{e.fhirType}
</span>
<span className="text-xs text-[var(--text-secondary)]">
{e.date ?? "—"}
</span>
</div>
</div>
<p className="text-sm font-medium text-[var(--text-primary)]">
{e.display || (
<span className="font-mono text-xs text-[var(--text-secondary)]">
{e.fhirId}
</span>
)}
</p>
{e.omopType && (
<p className="text-xs text-[var(--layer4-text)] mt-1">
↳ OMOP {e.omopType}: {e.omopId}
</p>
)}
</div>
</li>
);
})}
</ol>
</section>
))}
</div>
)}
</>
)}
</div>
</div>
);
}
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