Work on trainService data processing

Signed-off-by: Fred Boniface <fred@fjla.uk>

src/services/trainService.services.js

@@ -16,7 +16,7 @@ async function findByHeadcodeToday(headcode) {
     daysRun: {$in: [shortDay]}
   };
   const queryData = await db.query('timetable', query);
-  let trainData = await parseTrains(queryData, now);
+  let trainData = await parseTrains(queryData);
   let preparedData = [];
   for (const trainService in trainData) {
     // Search for PIS Code for each service
@@ -25,7 +25,7 @@ async function findByHeadcodeToday(headcode) {
       const pisDetail = await pis.findByTiplocArray(tiplocList);
       trainData[trainService]['pis'] = pisDetail?.[0]?.['code'] ?? 'None';
     } else {
-      trainData[trainService]['pis'] = '0015' // Not in Service code
+      trainData[trainService]['pis'] = '0015'; // Not in Service code
     }
     preparedData.push(trainData[trainService]);
   }
@@ -48,29 +48,131 @@ async function getPublicStops(data) {
   return tiplocList;
 }
 
-async function parseTrains(data, date = new Date() {
-  // Parses an array returned from a db-query and removes any service entries that don't apply to {date}
-  // {date} shoule be a datetime object and defaults to now if not provided - as a general rule it should always be provided for clarity
-    // At this point, the returned objects need sorting to ensure the correct object is returned.
-  // C, N, O, P is the order - C being the preferred, then N, then O and finally P.
-  // If stpindicator == "C" && trainUid (isSame as N, O or P entry) => DO NOT DISPLAY SERVICE ("C" records do not contain the headcode (signalling_id)) so an additional lookup needs to be performed for the trainUid.
-  // If stpIndicator == "N" && trainUid (isSame as O or P entry) => Display this instead of "O", or "P"
-  // If stpIndicaor == "O" && trainUid (isSame as P entry) => Display this instead of "P"
-  // Obviously, remember that several trains can share a headcode, but the trainUid is unique for each service.
-  // Probably best to loop through each return here and add to a new [], then if another entry supersedes it, overwrite it in the [].  Then pass to the below part of the function to process the data for sending.
-  // Maybe break in to a new function parseTrains() which can take in any dbquery array and remove any services that are not meant to be displayed based on the data provided.  Maybe have a date as an input so it can be used in the future to fetch trains for a given date in the future - due to database cleaning in db-manager, past dates would need adjustments to how the database is cleaned leaving outdated services available.
-  const parsedData = data;
-  return parsedData;
-  let trainUids = []
+async function parseTrains(data) { // Takes a single days data from a headcode query and returns only relevant services
+  let trainUids = [];
   for (const i in data) {
-    const trainUid = data[i]['trainUid']
+    const trainUid = data[i]['trainUid'];
     if (!trainUids.includes(trainUid)) {
-      data.push(trainUid)
+      data.push(trainUid);
     }
   }
-  let parsedData = []
+  let parsedData = [];
   for (const i in trainUids) {
-    result = await findByTrainUid(trainUids[i])
-    parsedData.push(result)
+    const result = await findByTrainUid(trainUids[i]);
+    parsedData.push(result);
   }
-};
+  return parsedData;
+}
+
+async function findByTrainUid(uid, date = new Date()) { // Date defaults to today
+  const query = {
+    trainUid: uid,
+    scheduleStartDate: {$lte: date},
+    scheduleEndDate: {$gte: date}
+  };
+  const queryData = await db.query('timetable', query);
+  let c = [];
+  let n = [];
+  let o = [];
+  let p = [];
+  for (const serviceDetail of queryData) {
+    const trainUid = serviceDetail['trainUid'];
+    switch (serviceDetail['stpIndicator']) { // This won't work without further post procesing
+    case 'C':
+      c.push(trainUid);
+      break;
+    case 'N':
+      if (!c.includes(trainUid)) {
+        n.push(trainUid);
+      }
+      break;
+    case 'O':
+      if (!c.includes(trainUid) && !n.includes(trainUid)) {
+        o.push(trainUid);
+      }
+      break;
+    case 'P':
+      if (!c.includes(trainUid) && !n.includes(trainUid) && !o.includes(trainUid)) {
+        p.push(trainUid);
+      }
+      break;
+    }
+  }
+}
+
+/* Thoughts:
+async function findByTrainUid(uid, date = new Date()) {
+  const query = {
+    trainUid: uid,
+    scheduleStartDate: { $lte: date },
+    scheduleEndDate: { $gte: date }
+  };
+
+  const queryData = await db.query('timetable', query);
+
+  if (queryData.length === 0) {
+    // Handle empty queryData
+    return {
+      c: [],
+      n: [],
+      o: [],
+      p: []
+    };
+  }
+
+  const trainUidSet = new Set();
+  const trainUidStatus = {}; // Track the status of each trainUid
+
+  for (const serviceDetail of queryData) {
+    const trainUid = serviceDetail['trainUid'];
+    const stpIndicator = serviceDetail['stpIndicator'];
+
+    if (!trainUidStatus[trainUid]) {
+      trainUidStatus[trainUid] = {
+        hasO: false,
+        hasN: false,
+        hasC: false
+      };
+    }
+
+    if (stpIndicator === 'O') {
+      trainUidStatus[trainUid].hasO = true;
+    } else if (stpIndicator === 'N') {
+      trainUidStatus[trainUid].hasN = true;
+    } else if (stpIndicator === 'C') {
+      trainUidStatus[trainUid].hasC = true;
+    }
+
+    trainUidSet.add(trainUid);
+  }
+
+  const c = [];
+  const n = [];
+  const o = [];
+  const p = [];
+
+  for (const serviceDetail of queryData) {
+    const trainUid = serviceDetail['trainUid'];
+    const stpIndicator = serviceDetail['stpIndicator'];
+
+    if (stpIndicator === 'C') {
+      continue; // Skip 'C' entries
+    }
+
+    if (stpIndicator === 'N' && !trainUidStatus[trainUid].hasC) {
+      n.push(trainUid);
+    } else if (stpIndicator === 'O' && !trainUidStatus[trainUid].hasN && !trainUidStatus[trainUid].hasC) {
+      o.push(trainUid);
+    } else if (stpIndicator === 'P' && !trainUidStatus[trainUid].hasN && !trainUidStatus[trainUid].hasO && !trainUidStatus[trainUid].hasC) {
+      p.push(trainUid);
+    }
+  }
+
+  return {
+    c,
+    n,
+    o,
+    p
+  };
+}
+*/