Getting average of time to complete tasks.

Not as good as expected. But I don't have time anymore. :'(
It appears as if the milliseconds are not converted into seconds and
minutes properly. Will have to see this in depth.

2 files changed, 58 insertions, 0 deletions

diff --git a/src/main/java/com/encora/Main.java b/src/main/java/com/encora/Main.java
index ea3a2a4..368fa29 100644
--- a/src/main/java/com/encora/Main.java
+++ b/src/main/java/com/encora/Main.java
@@ -6,6 +6,8 @@ import org.springframework.data.domain.Sort;
 import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.*;
 
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
 import java.util.*;
 
 @SpringBootApplication
@@ -233,4 +235,27 @@ public class Main {
         final int pageSize = 10;
         return (int) Math.ceil((double) toDosRepository.filteredToDos.size() / pageSize);
     }
+
+
+    // Return the average time on completing to dos.
+    @CrossOrigin(origins=allowed_origin)
+    @GetMapping("/todos/average/{priority}")
+    @ResponseStatus(value=HttpStatus.OK)
+    public String getAverageTime(@PathVariable("priority") String priority) {
+        String result = "";
+        Double milliseconds = toDosRepository.getAverageCompletingTime(priority);
+
+        if (milliseconds > 86400000) {
+            // More than a day.
+            Integer days = (int) (milliseconds / 86400000);
+            result += String.valueOf(days) + " days, ";
+        }
+
+        // Convert the milliseconds into an hour, minute, second and
+        // millisecond format.
+        DateFormat simple = new SimpleDateFormat("HH:mm:ss:SSS");
+        simple.setTimeZone(TimeZone.getTimeZone("GMT"));
+
+        return result + simple.format(milliseconds);
+    }
 }
diff --git a/src/main/java/com/encora/ToDosRepository.java b/src/main/java/com/encora/ToDosRepository.java
index c4bdcba..9333cd9 100644
--- a/src/main/java/com/encora/ToDosRepository.java
+++ b/src/main/java/com/encora/ToDosRepository.java
@@ -201,6 +201,39 @@ public class ToDosRepository implements JpaRepository<ToDos, Integer> {
         return this.filteredToDos;
     }
 
+    public Double getAverageCompletingTime(String priority) {
+        List<Double> recordedTimes = new ArrayList<>();
+
+        if (priority.equalsIgnoreCase("all")) {
+            for (ToDos todo : this.todos) {
+                if (!todo.isDone()) {
+                    continue;
+                }
+                recordedTimes.add(
+                        (double) (todo.getDoneDate().getTime() - todo.getCreationDate().getTime())
+                );
+            }
+        } else {
+            for (ToDos todo : this.todos) {
+                if (!todo.isDone() || !Objects.equals(String.valueOf(todo.getPriority()), priority)) {
+                    continue;
+                }
+                recordedTimes.add(
+                        (double) (todo.getDoneDate().getTime() - todo.getCreationDate().getTime())
+                );
+            }
+        }
+
+        if (recordedTimes.size() == 0) {
+            return (double) 0;
+        }
+        Double valuesSum = (double) 0;
+        for (Double d : recordedTimes) {
+            valuesSum += d;
+        }
+        return valuesSum / (double) recordedTimes.size();
+    }
+
     /*
     *         N O T   Y E T   D E F I N E D .
     */