From 4f6d55262cb865d5dd0adf406e21775fd4144a11 Mon Sep 17 00:00:00 2001
From: Alexander Polynomdivision <digitalmail555@googlemail.com>
Date: Tue, 2 Oct 2018 15:33:01 +0200
Subject: [PATCH] feat: Re-add vocab up to 2 times

---
 frontend/src/config.ts        |  3 +++
 frontend/src/pages/review.tsx | 30 +++++++++++++++++++++++++++---
 2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/frontend/src/config.ts b/frontend/src/config.ts
index de3389e..4bb76bd 100644
--- a/frontend/src/config.ts
+++ b/frontend/src/config.ts
@@ -3,3 +3,6 @@ export const LEVENSHTEIN_MAX_DISTANCE = 2;
 
 // export const BACKEND_URL = "http://127.0.0.1";
 export const BACKEND_URL = "https://192.168.178.100";
+
+// How often a wrongly answered group will be readded to the review queue
+export const MAX_ERROR_THRESHOLD = 2;
diff --git a/frontend/src/pages/review.tsx b/frontend/src/pages/review.tsx
index d21d5a2..4e1f282 100644
--- a/frontend/src/pages/review.tsx
+++ b/frontend/src/pages/review.tsx
@@ -25,7 +25,7 @@ import { IVocab, IReviewCard, vocabToReviewCard, reviewQTypeToStr } from "../mod
 import { ReviewType, IReviewMetadata } from "../models/review";
 
 import { levW } from "../algorithms/levenshtein";
-import { LEVENSHTEIN_MAX_DISTANCE } from "../config";
+import { LEVENSHTEIN_MAX_DISTANCE, MAX_ERROR_THRESHOLD } from "../config";
 
 import { Queue } from "../utils/queue";
 
@@ -63,6 +63,9 @@ const ReviewPageWithRouter = withRouter(
         // Used for positioning the popover
         private buttonRef: HTMLButtonElement;
         private inputRef: HTMLInputElement;
+        // How often a group has been wrongly answered
+        // (Mapping: Vocab Id -> amount of times it was wrongly answered)
+        private error_data = {};
         // Mapping: Vocab Id -> Correctly answered
         private sm2_metadata: any = {};
         private score_delta = 0;
@@ -97,6 +100,9 @@ const ReviewPageWithRouter = withRouter(
 
                 // Convert the vocab items into review queue cards
                 res.forEach(vocab => {
+                    // Set the error data for the group
+                    this.error_data[vocab.id] = 0;
+
                     vocabToReviewCard(vocab).forEach(this.reviewQueue.enqueue);
                 });
 
@@ -182,8 +188,10 @@ const ReviewPageWithRouter = withRouter(
             // Check if the given answer is somewhere in the german words
             const input = this.inputRef.value || "";
 
+            const { current } = this.props;
+
             // Map all possible answers to lowercase ( => ignore casing)
-            const answers = this.props.current.answers.map((el) => el.toLowerCase());
+            const answers = current.answers.map((el) => el.toLowerCase());
             // Calculate the distances to all possible answers
             const dists = answers.map((el) => levW(input.toLowerCase(), el));
             // Find the lowest distance
@@ -203,7 +211,7 @@ const ReviewPageWithRouter = withRouter(
                 if (this.reviewQueue.size() === 0) {
                     // Update the metadata
                     const newMeta = this.increaseMeta(1, 0);
-                    this.props.setReview(this.props.current, newMeta);
+                    this.props.setReview(current, newMeta);
                     this.props.setLastReview(newMeta, this.sm2_metadata, this.score_delta);
                     this.props.setLoading(true);
 
@@ -221,6 +229,22 @@ const ReviewPageWithRouter = withRouter(
             } else {
                 // Update the metadata
                 this.updateGroupSM2(false);
+
+                // Update the error data
+                this.error_data[current.id] += 1;
+                if (this.error_data[current.id] <= MAX_ERROR_THRESHOLD) {
+                    // Read the vocabulary group to the queue
+                    // Find the vocabulary item
+                    // TODO: if(!vocab)
+                    const vocab = this.vocab.find(el => el.id === current.id);
+
+                    // Re-add the vocabulary group
+                    // NOTE: We don't need to force a re-render, as the state
+                    //       will be updated since we need to show the popover.
+                    vocabToReviewCard(vocab).forEach(this.reviewQueue.enqueue);
+                }
+
+                // TODO: Is this the correct amount
                 this.score_delta -= 1;
                 this.props.setReview(this.props.current, this.increaseMeta(0, 1));
                 this.props.setPopover(true, "Das war nicht richtig", "red", "white");