FSR-965 | IMTD Logic change

server/models/views/lib/find-min-threshold.js

@@ -0,0 +1,37 @@
+function getMinFromType (arr, type) {
+  const filtered = arr.filter(item => item.threshold_type === type)
+  if (filtered.length) {
+    return filtered.reduce((min, curr) => parseFloat(curr.value) < parseFloat(min.value) ? curr : min)
+  }
+  return null
+}
+
+function findMinValueByLogic (arr, type) {
+  if (type === 'A') {
+    // Logic for Type A
+    return getMinFromType(arr, 'FW RES FAL') ||
+          getMinFromType(arr, 'FW ACT FAL') ||
+          getMinFromType(arr, 'FW ACTCON FAL')
+  } else if (type === 'W') {
+    // Logic for Type W
+    return getMinFromType(arr, 'FW RES FW') ||
+          getMinFromType(arr, 'FW ACT FW') ||
+          getMinFromType(arr, 'FW ACTCON FW')
+  }
+  return null
+}
+
+function filterImtdThresholds (imtdThresholds) {
+  const typeA = imtdThresholds.filter(item => item.fwis_type === 'A')
+  const typeW = imtdThresholds.filter(item => item.fwis_type === 'W')
+
+  const minObjectA = findMinValueByLogic(typeA, 'A')
+  const minObjectW = findMinValueByLogic(typeW, 'W')
+
+  return {
+    alert: minObjectA ? minObjectA.value : null,
+    warning: minObjectW ? minObjectW.value : null
+  }
+}
+
+module.exports = filterImtdThresholds

server/models/views/station.js

@@ -1,4 +1,3 @@
-// const hoek = require('@hapi/hoek')
 const moment = require('moment-timezone')
 const config = require('../../config')
 const severity = require('../severity')
@@ -7,6 +6,7 @@ const Forecast = require('./station-forecast')
 const util = require('../../util')
 const tz = 'Europe/London'
 const processImtdThresholds = require('./lib/process-imtd-thresholds')
+const filterImtdThresholds = require('./lib/find-min-threshold')
 
 class ViewModel {
   constructor (options) {
@@ -31,7 +31,6 @@ class ViewModel {
       trend: river.trend
     })
     // Group warnings/alerts by severity level
-
     const warningsAlertsGroups = util.groupBy(warningsAlerts, 'severity_value')
     const numAlerts = warningsAlertsGroups['1'] ? warningsAlertsGroups['1'].length : 0
     const numWarnings = warningsAlertsGroups['2'] ? warningsAlertsGroups['2'].length : 0
@@ -248,8 +247,12 @@ class ViewModel {
       })
     }
 
+    this.imtdThresholds = imtdThresholds?.length > 0
+      ? filterImtdThresholds(imtdThresholds)
+      : []
+
     const processedImtdThresholds = processImtdThresholds(
-      imtdThresholds,
+      this.imtdThresholds,
       this.station.stageDatum,
       this.station.subtract,
       this.station.post_process

test/data/forcastStationModelData.json

@@ -4,6 +4,7 @@
       "ffoi_station_threshold_id": 507,
       "ffoi_station_id": 87,
       "fwis_code": "062WAF28Mimmshal",
+      "fwis_type": "FW ACTCON FAL",
       "value": 0.96,
       "fwa_name": "Mimmshall Brook",
       "fwa_type": "a",
@@ -13,6 +14,7 @@
       "ffoi_station_threshold_id": 508,
       "ffoi_station_id": 87,
       "fwis_code": "062WAF28UpColne",
+      "fwis_type": "FW ACTCON FAL",
       "value": 2.3,
       "fwa_name": "Upper River Colne and Radlett Brook",
       "fwa_type": "a",
@@ -22,6 +24,7 @@
       "ffoi_station_threshold_id": 509,
       "ffoi_station_id": 87,
       "fwis_code": "062FWF28Warrengt",
+      "fwis_type": "FW ACTCON FW",
       "value": 2.24,
       "fwa_name": "Mimmshall Brook at Warrengate Road",
       "fwa_type": "w",
@@ -31,6 +34,7 @@
       "ffoi_station_threshold_id": 510,
       "ffoi_station_id": 87,
       "fwis_code": "062FWF28CHeath",
+      "fwis_type": "FW ACTCON FAL",
       "value": 2.7,
       "fwa_name": "River Colne at Colney Heath",
       "fwa_type": "w",
@@ -88,4 +92,4 @@
       }
     ]
   }
-}
+}

test/data/stationForecastData.json

@@ -48,6 +48,7 @@
         "ffoi_station_threshold_id":507,
         "ffoi_station_id":87,
         "fwis_code":"062WAF28Mimmshal",
+        "fwis_type": "FW ACTCON FAL",
         "value":0.96,
         "fwa_name":"Mimmshall Brook",
         "fwa_type":"a",
@@ -57,6 +58,7 @@
         "ffoi_station_threshold_id":508,
         "ffoi_station_id":87,
         "fwis_code":"062WAF28UpColne",
+        "fwis_type": "FW ACTCON FAL",
         "value":2.3,
         "fwa_name":"Upper River Colne and Radlett Brook",
         "fwa_type":"a",
@@ -66,6 +68,7 @@
         "ffoi_station_threshold_id":509,
         "ffoi_station_id":87,
         "fwis_code":"062FWF28Warrengt",
+        "fwis_type": "FW ACTCON FW",
         "value":2.24,
         "fwa_name":"Mimmshall Brook at Warrengate Road",
         "fwa_type":"w",
@@ -75,6 +78,7 @@
         "ffoi_station_threshold_id":510,
         "ffoi_station_id":87,
         "fwis_code":"062FWF28CHeath",
+        "fwis_type": "FW ACTCON FAL",
         "value":2.7,
         "fwa_name":"River Colne at Colney Heath",
         "fwa_type":"w",
@@ -297,5 +301,60 @@
         "geometry":"{\"type\":\"Point\",\"coordinates\":[-3.03674273776571,53.8811798090409]}"
       }
     ],
-    "imtdThresholds": { "alert": "44.91", "warning": "43.91" }
+    "imtdThresholds": [
+      {
+        "station_threshold_id": "1503831",
+        "station_id": "1001",
+        "fwis_code": "065WAF434",
+        "fwis_type": "A",
+        "direction": "u",
+        "value": "3.5",
+        "threshold_type": "FW ACTCON FAL"
+      },
+      {
+        "station_threshold_id": "1503832",
+        "station_id": "1001",
+        "fwis_code": "065WAF434",
+        "fwis_type": "A",
+        "direction": "u",
+        "value": "3.88",
+        "threshold_type": "FW ACT FAL"
+      },
+      {
+        "station_threshold_id": "1503833",
+        "station_id": "1001",
+        "fwis_code": "065FWF5402",
+        "fwis_type": "W",
+        "direction": "u",
+        "value": "3.9",
+        "threshold_type": "FW ACTCON FW"
+      },
+      {
+        "station_threshold_id": "1503834",
+        "station_id": "1001",
+        "fwis_code": "065FWF5402",
+        "fwis_type": "W",
+        "direction": "u",
+        "value": "4",
+        "threshold_type": "FW ACTCON FW"
+      },
+      {
+        "station_threshold_id": "1503835",
+        "station_id": "1001",
+        "fwis_code": "065FWF5402",
+        "fwis_type": "W",
+        "direction": "u",
+        "value": "4.2",
+        "threshold_type": "FW ACT FW"
+      },
+      {
+        "station_threshold_id": "1503836",
+        "station_id": "1001",
+        "fwis_code": "065FWF5402",
+        "fwis_type": "W",
+        "direction": "u",
+        "value": "4.3",
+        "threshold_type": "FW ACT FW"
+      }
+    ]
   }