feature: a very minimal patients feature implemented. it needs lots of improvments though

frontend/src/app/(dashboard)/patients/page.tsx

@@ -0,0 +1,219 @@
+'use client';
+
+import { useEffect, useMemo, useState } from 'react';
+import { Plus } from 'lucide-react';
+import { Button } from '@/components/ui/Button';
+import { patientsApi } from '@/lib/api/patients';
+import {
+  CreatePatientInput,
+  CreateTreatmentHistoryInput,
+  Patient,
+  TreatmentHistoryItem,
+} from '@/types/patient';
+import { PatientSearchSelect } from '@/components/patients/PatientSearchSelect';
+import { CreatePatientModal } from '@/components/patients/CreatePatientModal';
+import { PatientSummaryCard } from '@/components/patients/PatientSummaryCard';
+import { TreatmentHistoryPreview } from '@/components/patients/TreatmentHistoryPreview';
+
+const EMPTY_PATIENT_FORM: CreatePatientInput = {
+  firstName: '',
+  lastName: '',
+  phone: '',
+  email: '',
+};
+
+export default function PatientsPage() {
+  const [search, setSearch] = useState('');
+  const [patients, setPatients] = useState<Patient[]>([]);
+  const [selectedPatient, setSelectedPatient] = useState<Patient | undefined>();
+  const [treatments, setTreatments] = useState<TreatmentHistoryItem[]>([]);
+  const [loadingPatients, setLoadingPatients] = useState(false);
+  const [loadingTreatments, setLoadingTreatments] = useState(false);
+  const [isCreateOpen, setIsCreateOpen] = useState(false);
+  const [savingPatient, setSavingPatient] = useState(false);
+  const [savingTreatment, setSavingTreatment] = useState(false);
+  const [patientForm, setPatientForm] = useState<CreatePatientInput>(EMPTY_PATIENT_FORM);
+  const [errorMessage, setErrorMessage] = useState<string>('');
+  const [successMessage, setSuccessMessage] = useState<string>('');
+
+  const sortedPatients = useMemo(
+    () =>
+      [...patients].sort((a, b) =>
+        `${a.firstName} ${a.lastName}`.localeCompare(`${b.firstName} ${b.lastName}`),
+      ),
+    [patients],
+  );
+
+  useEffect(() => {
+    const timeout = setTimeout(() => {
+      void loadPatients(search);
+    }, 300);
+    return () => clearTimeout(timeout);
+  }, [search]);
+
+  useEffect(() => {
+    void loadPatients('');
+  }, []);
+
+  useEffect(() => {
+    if (!successMessage) {
+      return;
+    }
+
+    const timeout = setTimeout(() => {
+      setSuccessMessage('');
+    }, 3000);
+
+    return () => clearTimeout(timeout);
+  }, [successMessage]);
+
+  async function loadPatients(q: string) {
+    setLoadingPatients(true);
+    setErrorMessage('');
+    try {
+      const response = await patientsApi.list({ q, page: 1, limit: 25 });
+      const items = response.data.items;
+      setPatients(items);
+
+      if (selectedPatient) {
+        const freshSelected = items.find((item) => item.id === selectedPatient.id);
+        setSelectedPatient(freshSelected);
+      }
+    } catch (error: any) {
+      const message = Array.isArray(error?.message) ? error.message.join(', ') : error?.message;
+      setErrorMessage(message || 'Failed to load patients.');
+    } finally {
+      setLoadingPatients(false);
+    }
+  }
+
+  async function loadTreatments(patientId: string) {
+    setLoadingTreatments(true);
+    setErrorMessage('');
+    try {
+      const response = await patientsApi.listTreatments(patientId);
+      setTreatments(response.data);
+    } catch (error: any) {
+      const message = Array.isArray(error?.message) ? error.message.join(', ') : error?.message;
+      setErrorMessage(message || 'Failed to load treatment history.');
+    } finally {
+      setLoadingTreatments(false);
+    }
+  }
+
+  async function handleCreatePatient() {
+    setSavingPatient(true);
+    setErrorMessage('');
+    setSuccessMessage('');
+    try {
+      const response = await patientsApi.create(patientForm);
+      setIsCreateOpen(false);
+      setPatientForm(EMPTY_PATIENT_FORM);
+      await loadPatients(search);
+      setSelectedPatient(response.data);
+      await loadTreatments(response.data.id);
+      setSuccessMessage(
+        `Patient ${response.data.firstName} ${response.data.lastName} was saved successfully.`,
+      );
+    } catch (error: any) {
+      const message = Array.isArray(error?.message) ? error.message.join(', ') : error?.message;
+      setErrorMessage(message || 'Failed to save patient.');
+    } finally {
+      setSavingPatient(false);
+    }
+  }
+
+  async function handleQuickAddTreatment() {
+    if (!selectedPatient) {
+      return;
+    }
+
+    const payload: CreateTreatmentHistoryInput = {
+      title: 'Initial consultation',
+      status: 'scheduled',
+      treatmentAt: new Date().toISOString(),
+      notes: 'Created from quick action on patients page.',
+    };
+
+    setSavingTreatment(true);
+    setErrorMessage('');
+    setSuccessMessage('');
+    try {
+      await patientsApi.addTreatment(selectedPatient.id, payload);
+      await loadTreatments(selectedPatient.id);
+      setSuccessMessage('Treatment entry added successfully.');
+    } catch (error: any) {
+      const message = Array.isArray(error?.message) ? error.message.join(', ') : error?.message;
+      setErrorMessage(message || 'Failed to add treatment entry.');
+    } finally {
+      setSavingTreatment(false);
+    }
+  }
+
+  return (
+    <div className="relative space-y-6 pb-20">
+      <div className="flex items-center justify-between">
+        <h1 className="text-2xl font-semibold text-text-primary">Patients</h1>
+        <Button variant="primary" className="flex items-center gap-2" onClick={() => setIsCreateOpen(true)}>
+          <Plus className="h-4 w-4 icon-flat" />
+          New Patient
+        </Button>
+      </div>
+
+      <CreatePatientModal
+        isOpen={isCreateOpen}
+        formData={patientForm}
+        onChange={(patch) => setPatientForm((prev) => ({ ...prev, ...patch }))}
+        onSubmit={handleCreatePatient}
+        onClose={() => setIsCreateOpen(false)}
+        loading={savingPatient}
+      />
+
+      <div className="grid grid-cols-1 xl:grid-cols-3 gap-6">
+        <div className="xl:col-span-1">
+          <PatientSearchSelect
+            search={search}
+            onSearchChange={setSearch}
+            patients={sortedPatients}
+            selectedPatientId={selectedPatient?.id}
+            onSelectPatient={(patient) => {
+              setSelectedPatient(patient);
+              void loadTreatments(patient.id);
+            }}
+            loading={loadingPatients}
+          />
+        </div>
+
+        <div className="xl:col-span-2 space-y-4">
+          <PatientSummaryCard patient={selectedPatient} />
+          <div className="flex">
+            <Button
+              variant="secondary"
+              disabled={!selectedPatient}
+              isLoading={savingTreatment}
+              onClick={handleQuickAddTreatment}
+            >
+              Add Quick Treatment Entry
+            </Button>
+          </div>
+          <TreatmentHistoryPreview items={treatments} loading={loadingTreatments} />
+        </div>
+      </div>
+
+      {(errorMessage || successMessage) && (
+        <div className="absolute bottom-0 left-0 right-0 z-50 w-full">
+          {errorMessage && (
+            <div className="rounded-[var(--radius-sm)] border border-red-500/50 bg-red-500/10 px-3 py-2 text-sm text-red-300 shadow-lg">
+              {errorMessage}
+            </div>
+          )}
+          {successMessage && (
+            <div className="rounded-[var(--radius-sm)] border border-emerald-500/50 bg-emerald-500/10 px-3 py-2 text-sm text-emerald-300 shadow-lg">
+              {successMessage}
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}