Add user-specific quiz statistics

plugins/game.js

@@ -1,7 +1,7 @@
 export class Game {
   constructor (id, questions, created, player1id, player1name, player1answers, player2id, player2name, player2answers) {
     this.id = id
-    this.questions = questions
+    this.questionIds = questions
     this.created = created
     this.player1id = player1id
     this.player1name = player1name
@@ -10,13 +10,38 @@ export class Game {
     this.player2name = player2name
     this.player2answers = player2answers
   }
+
+  getResult () {
+    if (!this.questions) return {}
+    const qs = this.questions
+
+    function countCorrectAnswers(answersGiven) {
+      let i = 0
+      answersGiven.forEach(a => {
+        const q = qs.find(e => e.id === a.frage)
+        if (q && a.antwort === q.correctAnswer) i++
+      })
+      return i
+    }
+
+    const correctAnswersPl1 = countCorrectAnswers(this.player1answers)
+    const correctAnswersPl2 = countCorrectAnswers(this.player2answers)
+
+    return {
+      winner: correctAnswersPl1 > correctAnswersPl2 ? 1 : 2,
+      loser: correctAnswersPl1 > correctAnswersPl2 ? 2 : 1,
+      tie: correctAnswersPl1 === correctAnswersPl2,
+      correctAnswersPl1,
+      correctAnswersPl2
+    }
+  }
 }
 
 // Firestore data converter
 export const GameConverter = {
   toFirestore: (game) => {
     return {
-      fragen: game.questions,
+      fragen: game.questionIds,
       erstellt: game.created,
       spieler1id: game.player1id,
       spieler1name: game.player1name,