X-Git-Url: http://git.shiar.nl/sheet.git/blobdiff_plain/557e9a9b737294f5e170f8f5474ff750ab72cb4a..c7530c743eb2d8f45167ae0a9ed641559a4d550e:/word/quiz.js

diff --git a/word/quiz.js b/word/quiz.js
index 70f8500..1aaab61 100644
--- a/word/quiz.js
+++ b/word/quiz.js
@@ -1,21 +1,93 @@
 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');
+		};
 	}
 }