word: reload page to apply changed location hash

[sheet.git] / word / quiz.js

diff --git a/word/quiz.js b/word/quiz.js
index 70f8500bf2bffa30e0b5b899be79c3d561effc92..a7194bbac88418f0b5cfd89aa6e5dd8c1369c9d4 100644 (file)
--- a/word/quiz.js
+++ b/word/quiz.js
@@ -1,21 +1,96 @@
 Array.prototype.shuffle = function () {
-       return this.sort(() => {return .5 - Math.random()});
+       for (let i = this.length - 1; i > 0; i--) {
+               const j = Math.floor(Math.random() * (i + 1)); // random index 0..i
+               [this[i], this[j]] = [this[j], this[i]]; // swap elements
+       }
+       return this;
+};
+
+Set.prototype.filter = function (f) {
+       return new Set([...this].filter(f));
 };
 
 class WordQuiz {
        dataselect(json) {
-               let rows = Object.values(json);
+               this.data = this.datafilter(json);
+               let rows = Object.values(this.data);
+               rows = rows.filter(row => !row[3].length); // remove referenced categories
                return rows.shuffle();
        }
 
+       datafilter(json) {
+               // find viable rows from json data
+               let ids = new Set(Object.keys(json));
+               const selection = {...json}; // clone
+
+               if (this.preset.cat !== undefined) {
+                       ids.clear();
+                       let children = [this.preset.cat];
+                       for (let loop = 0; children.length && loop < 20; loop++) {
+                               for (let child of children) ids.add(child.toString());
+                               children = children.map(cat => json[cat][3]).filter(is => is).flat()
+                       }
+               }
+               if (this.preset.image) {
+                       ids = ids.filter(id => json[id][2]);
+               }
+               if (this.preset.level !== undefined) {
+                       ids = ids.filter(id => json[id][1] <= this.preset.level);
+               }
+
+               // keep only wanted ids
+               for (let id in selection) {
+                       if (id && !ids.has(id)) {
+                               delete selection[id];
+                       }
+               }
+
+               // retain orphaned references in grandparent categories
+               for (let id in selection) {
+                       selection[id][3] = function subresolve(subs) {
+                               //console.log(subs);
+                               return (subs || []).flatMap(sub =>
+                                       sub in selection ? [sub] : subresolve(json[sub][3])
+                               );
+                       }(selection[id][3]);
+               }
+               return selection;
+       }
+
        load(dataurl) {
+               this.preset = {};
+               let input;
+               if (input = window.location.hash.match(/\d+/)) {
+                       this.preset.cat = parseInt(input[0]);
+               }
+               if (window.location.hash.match(/a/)) {
+                       this.preset.level = 3;
+               }
+
                fetch(dataurl).then(res => res.json()).then(json => {
                        this.words = this.dataselect(json)
                        this.setup();
                });
        }
 
+       log(...args) {
+               this.history.push([new Date().toISOString(), ...args]);
+       }
+
+       stop(...args) {
+               this.log(...args);
+               window.onbeforeunload = null;
+               fetch('/word/report', {method: 'POST', body: JSON.stringify(this.history)});
+       }
+
        constructor(dataurl) {
                this.load(dataurl);
+               this.history = [];
+               window.onbeforeunload = e => {
+                       this.stop('abort');
+               };
+               window.onhashchange = e => {
+                       this.load(dataurl);
+               };
        }
 }