adding custom expressions for form rendering

packages/esm-ugandaemr-app/package.json

@@ -38,6 +38,7 @@
     },
     "dependencies": {
         "@carbon/react": "^1.14.0",
+        "@openmrs/openmrs-form-engine-lib": "next",
         "lodash-es": "^4.17.15"
     },
     "peerDependencies": {

packages/esm-ugandaemr-app/src/custom-expressions.ts

@@ -0,0 +1,51 @@
+import {fhirBaseUrl, openmrsFetch, restBaseUrl} from "@openmrs/esm-framework";
+import {date} from "zod";
+import dayjs from "dayjs";
+
+export function CalcMonthsOnART(artStartDate: Date, followupDate: Date) {
+  let resultMonthsOnART: number;
+  let artInDays = Math.round((followupDate.getTime() - artStartDate.getTime?.()) / 86400000);
+  if (artStartDate && followupDate && artInDays < 30) {
+    resultMonthsOnART = 0;
+  } else if (artStartDate && followupDate && artInDays >= 30) {
+    resultMonthsOnART = Math.floor(artInDays / 30);
+  }
+
+  return artStartDate && followupDate ? resultMonthsOnART : null;
+}
+
+export async function getLatestObs(patientUuid: string, conceptUuid: string, encounterTypeUuid?: string) {
+  let params = `patient=${patientUuid}&code=${conceptUuid}${
+    encounterTypeUuid ? `&encounter.type=${encounterTypeUuid}` : ''
+  }`;
+
+  params += '&_sort=-_lastUpdated&_count=1';
+  const { data } = await openmrsFetch(`${fhirBaseUrl}/Observation?${params}`);
+
+  return data.entry?.length ? data.entry[0].resource : null;
+}
+
+export async function getConceptDataType(conceptUuid: string) {
+  let apiUrl = `${restBaseUrl}/concept/${conceptUuid}?v=custom:(datatype:(name,uuid,display))`;
+
+  const { data } = await openmrsFetch(apiUrl);
+
+  return data?.datatype?.name;
+}
+export async function latestObs(patientId: string, conceptUuid: string) {
+  const response = await getLatestObs(patientId, conceptUuid);
+
+  if (response) {
+    const conceptDataType = await getConceptDataType(conceptUuid);
+
+    if (conceptDataType === 'Date') {
+      return dayjs(response?.valueDateTime).format('DD/MM/YYYY');
+    } else if (conceptDataType === 'Coded') {
+      return response?.valueCodeableConcept?.coding[0]?.display;
+    }else if (conceptDataType === 'Numeric') {
+      return response?.referenceRange[0]?.high?.value;
+    }
+
+
+  }
+}

packages/esm-ugandaemr-app/src/index.ts

@@ -18,6 +18,8 @@ import SubjectiveFindingsComponent from './pages/clinical-patient-summary/clinic
 import ObjectiveFindingsComponent from './pages/clinical-patient-summary/clinical-patient-summary-tabs/objective-findings.component';
 import TreatmentPlanComponent from './pages/clinical-patient-summary/clinical-patient-summary-tabs/treatment-plan.component';
 import AssessmentComponent from './pages/clinical-patient-summary/clinical-patient-summary-tabs/assessment.component';
+import {CalcMonthsOnART, getLatestObs, latestObs} from './custom-expressions';
+import { registerControl, registerExpressionHelper } from '@openmrs/openmrs-form-engine-lib';
 
 export const importTranslation = require.context('../translations', false, /.json$/, 'lazy');
 
@@ -36,6 +38,8 @@ export const dispensingAppMenuItem = getSyncLifecycle(dispensingAppMenu, options
 
 export function startupApp() {
   defineConfigSchema(moduleName, configSchema);
+  registerExpressionHelper('CustomMonthsOnARTCalc', CalcMonthsOnART);
+  registerExpressionHelper('cusGetLatestObs', latestObs);
 }
 
 // pages
@@ -107,4 +111,4 @@ export const objectiveFindingsSection = getSyncLifecycle(ObjectiveFindingsCompon
 
 export const treatmentPlanSection = getSyncLifecycle(TreatmentPlanComponent, options);
 
-export const assessmentSection = getSyncLifecycle(AssessmentComponent, options)
+export const assessmentSection = getSyncLifecycle(AssessmentComponent, options);

packages/esm-ugandaemr-app/webpack.config.js

@@ -9,6 +9,7 @@ config.overrides.resolve = {
   alias: {
     '@openmrs/esm-framework': '@openmrs/esm-framework/src/internal',
     '@ohri/openmrs-esm-ohri-commons-lib': '@ohri/openmrs-esm-ohri-commons-lib/src/index',
+    '@openmrs/openmrs-form-engine-lib': '@openmrs/openmrs-form-engine-lib/src/index',
   },
 };