Added two functions moveToEndOfQueue and clearQueue, the first functi…

nginx/public/index.html

@@ -65,6 +65,7 @@ <h4 class="text-success">Now with dark mode for the true programmers!</h4>
 <button onclick="jumbotronButtonPressed();" class="btn btn-sm btn-danger">Use this screen as a JUMBOTRON!</button>
 
 <br/>
+<div id="changeUsername"></div>
 <br/>
 
 <div id="queue"></div>

src/main/scala/model/OfficeHoursServer.scala

@@ -117,6 +117,8 @@ class EnterQueueListener(server: OfficeHoursServer) extends DataListener[String]
         i.sendEvent("queue", server.queueJSON_TA())
       }
 
+    }else{
+      socket.sendEvent("changeUsername","This username has been used by another student in the queue, please use another username.")
     }
   }
 }

src/main/scala/model/database/Database.scala

@@ -45,8 +45,22 @@ class Database extends DatabaseAPI {
 
     statement.execute()
   }
+  override def moveToEndOfQueue(student: StudentInQueue): Unit = {
+    val statement1 = connection.prepareStatement("DELETE FROM queue WHERE username=?")
+    statement1.setString(1, student.username)
+    statement1.execute()
+
+    val statement2 = connection.prepareStatement("INSERT INTO queue VALUE (?, ?, ?)")
+    statement2.setString(1, student.username)
+    statement2.setString(2, student.helpDescription)
+    statement2.setLong(3, System.nanoTime())
+    statement2.execute()
+  }
 
-
+  override def clearQueue:Unit = {
+    val statement = connection.prepareStatement("TRUNCATE TABLE queue")
+    statement.execute()
+  }
   override def removeStudentFromQueue(username: String): Unit = {
     val statement = connection.prepareStatement("DELETE FROM queue WHERE username=?")
     statement.setString(1, username)

src/main/scala/model/database/DatabaseAPI.scala

@@ -5,6 +5,8 @@ import model.StudentInQueue
 trait DatabaseAPI {
 
   def addStudentToQueue(student: StudentInQueue): Unit
+  def moveToEndOfQueue(student: StudentInQueue): Unit
+  def clearQueue:Unit
   def removeStudentFromQueue(username: String): Unit
   def getQueue: List[StudentInQueue]
   def checkTACredentials(credentials: String): Boolean

src/main/scala/model/database/TestingDatabase.scala

@@ -11,12 +11,21 @@ class TestingDatabase extends DatabaseAPI {
     data ::= student
   }
 
+  override def moveToEndOfQueue(student: StudentInQueue): Unit = {
+    data = data.filter(_.username != student.username)
+    var latestTime = data.head.timestamp
+    val newStudent = new StudentInQueue(student.username,student.helpDescription,latestTime+1)
+    data ::= newStudent
+  }
+
+  override def clearQueue: Unit = {
+    data = List()
+  }
 
   override def removeStudentFromQueue(username: String): Unit = {
     data = data.filter(_.username != username)
   }
 
-
   override def getQueue: List[StudentInQueue] = {
     data.reverse
   }

src/main/scala/testCases.scala

@@ -0,0 +1,71 @@
+import java.sql.{Connection, DriverManager, ResultSet}
+import model.database.{Database,DatabaseAPI,TestingDatabase}
+import model.StudentInQueue
+import play.api.libs.json.Json
+import org.mindrot.jbcrypt.BCrypt
+import org.scalatest.FunSuite
+
+class testCases extends FunSuite{
+    test("myTest"){
+
+      val database = new TestingDatabase
+      val student1 = new StudentInQueue("David","Project1",5)
+      val student2 = new StudentInQueue("Alex","Project2",50)
+      val student3 = new StudentInQueue("Jesse","Project3",500)
+      val student4 = new StudentInQueue("Ethan","Project4",5000)
+      val student5 = new StudentInQueue("Nathan","Project5",50000)
+
+
+      database.addStudentToQueue(student1)
+      database.addStudentToQueue(student2)
+      database.addStudentToQueue(student3)
+      val queue = database.getQueue
+      assert(queue(0).username == "David")
+      assert(queue(0).helpDescription == "Project1")
+      assert(queue(0).timestamp == 5)
+
+      assert(queue(1).username == "Alex")
+      assert(queue(1).helpDescription == "Project2")
+      assert(queue(1).timestamp == 50)
+
+      assert(queue(2).username == "Jesse")
+      assert(queue(2).helpDescription == "Project3")
+      assert(queue(2).timestamp == 500)
+
+      database.removeStudentFromQueue("Alex")
+      val queue2 = database.getQueue
+      assert(queue2(1).username == "Jesse")
+      assert(queue2(1).helpDescription == "Project3")
+      assert(queue2(1).timestamp == 500)
+
+      database.clearQueue
+      val queue3 = database.getQueue
+      assert(queue3 == List())
+      database.addStudentToQueue(student1)
+      database.addStudentToQueue(student2)
+      database.addStudentToQueue(student3)
+      database.addStudentToQueue(student4)
+      database.addStudentToQueue(student5)
+      database.moveToEndOfQueue(student2)
+      val queue4 = database.getQueue
+      assert(queue4(0).username == "David")
+      assert(queue4(0).helpDescription == "Project1")
+      assert(queue4(0).timestamp == 5)
+      assert(queue4(1).username == "Jesse")
+      assert(queue4(1).helpDescription == "Project3")
+      assert(queue4(1).timestamp == 500)
+      assert(queue4(2).username == "Ethan")
+      assert(queue4(2).helpDescription == "Project4")
+      assert(queue4(2).timestamp == 5000)
+      assert(queue4(3).username == "Nathan")
+      assert(queue4(3).helpDescription == "Project5")
+      assert(queue4(3).timestamp == 50000)
+      assert(queue4(4).username == "Alex")
+      assert(queue4(4).helpDescription == "Project2")
+      assert(queue4(4).timestamp == 50001)
+
+
+
+
+    }
+}