From b3ab0496f8182c805c941dc245a91517b5c203c9 Mon Sep 17 00:00:00 2001
From: Anton Romanov <a.romanov@ulstu.ru>
Date: Sat, 25 Feb 2023 14:12:44 +0400
Subject: [PATCH] group time series tendencies

---
 .../controller/TimeSeriesController.java      |  7 ++++++
 .../ru/ulstu/service/TimeSeriesService.java   | 25 +++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/src/main/java/ru/ulstu/controller/TimeSeriesController.java b/src/main/java/ru/ulstu/controller/TimeSeriesController.java
index a6c6cd0..eef1580 100644
--- a/src/main/java/ru/ulstu/controller/TimeSeriesController.java
+++ b/src/main/java/ru/ulstu/controller/TimeSeriesController.java
@@ -85,4 +85,11 @@ public class TimeSeriesController {
     public ResponseEntity<List<Method>> getAvailableMethods() {
         return new ResponseEntity<>(timeSeriesService.getAvailableMethods(), HttpStatus.OK);
     }
+
+    @PostMapping("getGroupedTendencies")
+    @Operation(description = "Получить список сгруппированных тенденций")
+    public ResponseEntity<TimeSeries> getGroupedTendencies(@RequestBody TimeSeries timeSeries) throws ModelingException, ExecutionException, InterruptedException, InvocationTargetException, NoSuchMethodException, InstantiationException, IllegalAccessException {
+        return new ResponseEntity<>(timeSeriesService.getGroupedTendencies(timeSeries), HttpStatus.OK);
+    }
+
 }
diff --git a/src/main/java/ru/ulstu/service/TimeSeriesService.java b/src/main/java/ru/ulstu/service/TimeSeriesService.java
index 525eb79..10c7eea 100644
--- a/src/main/java/ru/ulstu/service/TimeSeriesService.java
+++ b/src/main/java/ru/ulstu/service/TimeSeriesService.java
@@ -42,4 +42,29 @@ public class TimeSeriesService {
     public List<Method> getAvailableMethods() {
         return methodParamBruteForce.getAvailableMethods();
     }
+
+    public TimeSeries getGroupedTendencies(TimeSeries timeSeries) throws ModelingException, ExecutionException, InterruptedException, InvocationTargetException, NoSuchMethodException, InstantiationException, IllegalAccessException {
+        timeSeries = smoothTimeSeries(timeSeries, "FTransform").getTimeSeries();
+        int i = 2;
+        double prevDiff = timeSeries.getNumericValue(1) -
+                timeSeries.getNumericValue(0);
+        while (i < timeSeries.getLength()) {
+            double diff = timeSeries.getNumericValue(i) -
+                    timeSeries.getNumericValue(i - 1);
+            //если тенденция сохранилась
+            if (tsTendencyNotChanged(diff, prevDiff)) {
+                timeSeries.getValues().remove(i - 1);
+            } else {
+                i++;
+            }
+            prevDiff = diff;
+        }
+        return timeSeries;
+    }
+
+    private boolean tsTendencyNotChanged(double diff, double prevDiff) {
+        return (diff > 0 && prevDiff > 0)
+                || ((diff < 0 && prevDiff < 0)
+                || ((diff == 0 && prevDiff == 0)));
+    }
 }