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Appointment.js
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Appointment.js
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exports = async function(request, response) {
const queryParams = request.query;
const collection = context.services.get("mongodb-atlas").db("FHIR").collection("appointments");
const query = {};
const sort = {};
const project = {};
const codeParams = {};
const aggreg = [];
const pageSize = 20;
const limit={};
let tot = true;
let dynamicPageSize = null;
const URL = 'https://fakeurl.com/endpoint/appointment'//put your http endpoint URL here
const FieldMap = {
'actor': 'participant.actor.reference',
'date': 'start',
'identifier':'_id',
'location': 'location.reference',
'part-status': 'participant.0.actor.status',
'patient':'participant.0.actor.reference',
'practitioner': 'participant.1.actor.reference',
'status': 'status',
};
for (const key in queryParams) {
switch (key) {
case "actor":
query[FieldMap[key]] = new BSON.ObjectId(queryParams[key]);
break;
case "date":
const dateParams = queryParams[key].split(",");
const dateFilters = dateParams.map((dateParam) => {
const firstTwoChars = dateParam.substr(0, 2);
const dateValue = dateParam.slice(2);
if (firstTwoChars === "ge" || firstTwoChars === "le") {
const operator = firstTwoChars === "ge" ? "$gte" : "$lte";
return { ["start"]: { [operator] : new Date(dateValue) } };
}
return null;
});
query["$and"] = dateFilters.filter((filter) => filter !== null);
break;
case "identifier":
query[FieldMap[key]] = new BSON.ObjectId(queryParams[key]);
break;
case "location":
try {
query[FieldMap[key]] = new BSON.ObjectId(queryParams[key]);
} catch (error) {
const locValues = queryParams[key].split(",");
query[FieldMap[key]] = { $in: locValues };
}
break;
case "location:contains" :
try {
query[FieldMap[key]] = {"$regex": new BSON.ObjectId(queryParams[key]), "$options": "i"};
} catch (error) {
query[FieldMap[key]] = {"$regex": queryParams[key], "$options": "i"};
}
break;
case "part-status":
query[FieldMap[key]] = new BSON.ObjectId(queryParams[key]);
break;
case "patient":
query[FieldMap[key]] = new BSON.ObjectId(queryParams[key]);
break;
case "practitioner":
query[FieldMap[key]] = new BSON.ObjectId(queryParams[key]);
break;
case "status":
const statusValues = queryParams[key].split(",");
query[FieldMap[key]] = { $in: statusValues };
break;
case "_count":
dynamicPageSize = parseInt(queryParams[key]);
break;
case "_elements":
const Params = queryParams[key].split(",");
for (const param of Params) {
if (FieldMap[param]) {
project[FieldMap[param]] = 1;
}
}
break;
case "_sort":
// sort logic
const sortDirection = queryParams[key].startsWith("-") ? -1 : 1;
const sortField = queryParams[key].replace(/^-/, '');
sort[FieldMap[sortField]] = sortDirection;
break;
case "_maxresults":
// sort logic
limit["_maxresults"]=parseInt(queryParams[key])
break;
case "_total":
tot = false;
break;
default:
// Default case for other keys
codeParams[key] = queryParams[key];
break;
}
}
let findResult;
const page = parseInt(codeParams.page) || 1;
if (tot) {
aggreg.push({'$match':query});
if(Object.keys(sort).length > 0){
aggreg.push({'$sort':sort});
} else {
aggreg.push({'$sort':{"start":1}});
}
if(Object.keys(project).length > 0){
aggreg.push({'$project':project});
}
if(Object.keys(limit).length > 0){
aggreg.push({'$limit':limit["_maxresults"]});
}else{
aggreg.push({'$limit':(dynamicPageSize||pageSize)*page});
}
try {
//findResult = await collection.find(query).sort(sort).limit((dynamicPageSize||pageSize)*pageSize).toArray();
findResult = await collection.aggregate(aggreg).toArray();
} catch (err) {
console.log("Error occurred while executing find:", err.message);
response.setStatusCode(500);
response.setHeader("Content-Type", "application/json");
return { error: err.message };
}
} else {
findResult = [];
}
let total
if(Object.keys(limit).length > 0){
total=limit["_maxresults"];
}else{
total = await collection.count(query);
}
const totalPages = Math.ceil(total / (dynamicPageSize || pageSize));
const startIdx = (page - 1) * (dynamicPageSize || pageSize);
const endIdx = startIdx + (dynamicPageSize || pageSize);
const resultsInBundle = findResult.slice(startIdx, endIdx);
const bundle = {
resourceType: "Bundle",
type: "searchset",
total:total,
link:[],
entry: resultsInBundle.map((resource) => ({
fullUrl: `${URL}?id=${resource._id}`,
resource,
search: {
mode: 'match'
},
})),
};
if (page <= totalPages) {
if (page > 1 && page!==totalPages) {
bundle.link = [
{ relation: "previous", url: `${URL}${getQueryString(queryParams,sort,page-1,dynamicPageSize || pageSize)}` },
{ relation: "self", url: `${URL}${getQueryString(queryParams,sort,page,dynamicPageSize || pageSize)}` },
{ relation: "next", url: `${URL}${getQueryString(queryParams,sort,page+1,dynamicPageSize || pageSize)}` },
];
} else if(page==totalPages && totalPages!==1) {
bundle.link = [
{ relation: "previous", url: `${URL}${getQueryString(queryParams,sort,page-1,dynamicPageSize || pageSize)}` },
{ relation: "self", url: `${URL}${getQueryString(queryParams,sort,page,dynamicPageSize || pageSize)}` }
];
} else if(totalPages==1 || dynamicPageSize==0) {
bundle.link = [
{ relation: "self", url: `${URL}${getQueryString(queryParams,null,0,0)}` },
];
} else {
bundle.link = [
{ relation: "self", url: `${URL}${getQueryString(queryParams,sort,page,dynamicPageSize || pageSize)}` },
{ relation: "next", url: `${URL}${getQueryString(queryParams,sort,page+1,dynamicPageSize || pageSize)}` },
];
}
}
response.setStatusCode(200);
response.setHeader("Content-Type", "application/json");
response.setBody(JSON.stringify(bundle, null, 2));
};
// Helper function to generate query string from query parameters
function getQueryString(params,sort, p, pageSize) {
let paramString = "";
let queryString = "";
if (params && Object.keys(params).length > 0) {
paramString = Object.keys(params)
.filter((key) => key !== "page" && key !== "_count")
.map((key) => `${(key)}=${params[key]}`)
.join("&");
}
if (paramString!==""){
if (p > 1) {
queryString = `?`+ paramString.replace(/ /g, "%20") + `&page=${(p)}&_count=${pageSize}`;
} else {
queryString += `?`+ paramString.replace(/ /g, "%20") +`&_count=${pageSize}`
}
} else if (p > 1) {
queryString = `?page=${(p)}&_count=${pageSize}`;
}
return queryString;
}