// ==UserScript==
// @name Duolingo input language switcher
// @namespace https://www.duolingo.com/IVrL9
// @author T1mL3arn
// @match https://www.duolingo.com/*
// @version 2.0.2
// @description This script allows you to type letters appropriate for current task without changing keyboard's layout
// @run-at document-start
// @grant none
// @icon https://www.androidpolice.com/wp-content/uploads/2014/03/nexusae0_Duolingo-Thumb.png
// @license GPLv3
// @homepageURL https://github.com/T1mL3arn/Duolingo-input-language-switcher
// @supportURL https://greasyfork.org/en/scripts/37693-duolingo-input-language-switcher/feedback
// @downloadURL none
// ==/UserScript==

// Generated by Haxe 4.0.5
(function ($global) { "use strict";
var Main = function() {
	this.document = window.document;
	this.console = window.console;
	this.initLanguages();
	if(this.document.readyState == "interactive" || this.document.readyState == "complete") {
		this.onready();
	} else {
		this.document.addEventListener("DOMContentLoaded",$bind(this,this.onready));
	}
};
Main.main = function() {
	new Main();
};
Main.prototype = {
	initLanguages: function() {
		this.keyCodes = ["Backquote","Digit1","Digit2","Digit3","Digit4","Digit5","Digit6","Digit7","Digit8","Digit9","Digit0","Minus","Equal","Backslash","KeyQ","KeyW","KeyE","KeyR","KeyT","KeyY","KeyU","KeyI","KeyO","KeyP","BracketLeft","BracketRight","KeyA","KeyS","KeyD","KeyF","KeyG","KeyH","KeyJ","KeyK","KeyL","Semicolon","Quote","KeyZ","KeyX","KeyC","KeyV","KeyB","KeyN","KeyM","Comma","Period","Slash"];
		this.languages = { };
		this.languages.ru = "ё1234567890-=\\йцукенгшщзхъфывапролджэячсмитьбю.Ё!\"№;%:?*()_+/ЙЦУКЕНГШЩЗХЪФЫВАПРОЛДЖЭЯЧСМИТЬБЮ,";
		this.languages.en = "`1234567890-=\\qwertyuiop[]asdfghjkl;'zxcvbnm,./~!@#$%^&*()_+|QWERTYUIOP{}ASDFGHJKL:\"ZXCVBNM<>?";
		var len = this.languages.ru.length;
		var _g = 0;
		var _g1 = Reflect.fields(this.languages);
		while(_g < _g1.length) {
			var f = _g1[_g];
			++_g;
			var act = this.languages[f].length;
			if(act != len) {
				this.console.error("LangString test failed: expected len " + len + "; actual len " + act + "; lang name " + f);
				this.console.error(this.languages[f]);
				return;
			}
			if(act != this.keyCodes.length * 2) {
				this.console.error("KeyCodes and LangString test failed: expected lang string len " + this.keyCodes.length * 2 + "; actual len " + act + "; lang name " + f);
				return;
			}
		}
	}
	,onready: function(e) {
		this.document.removeEventListener("DOMContentLoaded",$bind(this,this.onready));
		this.console.log("Duolingo input switcher is ready");
		window.document.body.addEventListener("keydown",$bind(this,this.onKeyDown));
	}
	,onKeyDown: function(e) {
		if(e.ctrlKey) {
			return;
		}
		var pressedKeyCodeIndex = this.keyCodes.indexOf(e.code);
		if(pressedKeyCodeIndex == -1) {
			return;
		}
		var inputElt = e.target;
		switch(inputElt.dataset.test) {
		case "challenge-listen-input":case "challenge-listentap-input":case "challenge-name-input":
			this.setLanguagePair("en","ru");
			break;
		case "challenge-text-input":
			this.setLanguagePair("en","ru");
			break;
		case "challenge-translate-input":
			this.nativeLanguage = "ru";
			this.foreignLanguage = "en";
			var lang = inputElt.getAttribute("lang");
			if(lang == this.nativeLanguage) {
				this.setLanguagePair("ru","en");
			} else if(lang == this.foreignLanguage) {
				this.setLanguagePair("en","ru");
			}
			break;
		default:
			return;
		}
		e.preventDefault();
		this.replaceLetter(this.getLanguageLetter(this.targetLanguage,pressedKeyCodeIndex,e.shiftKey),inputElt);
		this.callReactOnChange(inputElt);
	}
	,setLanguagePair: function(target,source) {
		this.targetLanguage = target;
		this.sourceLanguage = source;
	}
	,getLanguageLetter: function(language,letterIndex,isUppercase) {
		var letters = this.languages[language];
		if(isUppercase) {
			return letters.charAt(letterIndex + this.keyCodes.length);
		} else {
			return letters.charAt(letterIndex);
		}
	}
	,replaceLetter: function(letter,inputElt) {
		var start = inputElt.selectionStart;
		var end = inputElt.selectionEnd;
		var phrase = inputElt.value;
		phrase = phrase.substring(0,start) + letter + phrase.substring(end);
		inputElt.value = phrase;
		inputElt.setSelectionRange(start + 1,start + 1);
	}
	,callReactOnChange: function(elt) {
		var _g = 0;
		var _g1 = Reflect.fields(elt);
		while(_g < _g1.length) {
			var fieldName = _g1[_g];
			++_g;
			if(fieldName.indexOf("__reactEventHandlers") != -1) {
				Reflect.field(elt,fieldName).onChange({ target : elt});
			}
		}
	}
};
var Reflect = function() { };
Reflect.field = function(o,field) {
	try {
		return o[field];
	} catch( e ) {
		return null;
	}
};
Reflect.fields = function(o) {
	var a = [];
	if(o != null) {
		var hasOwnProperty = Object.prototype.hasOwnProperty;
		for( var f in o ) {
		if(f != "__id__" && f != "hx__closures__" && hasOwnProperty.call(o,f)) {
			a.push(f);
		}
		}
	}
	return a;
};
var $_;
function $bind(o,m) { if( m == null ) return null; if( m.__id__ == null ) m.__id__ = $global.$haxeUID++; var f; if( o.hx__closures__ == null ) o.hx__closures__ = {}; else f = o.hx__closures__[m.__id__]; if( f == null ) { f = m.bind(o); o.hx__closures__[m.__id__] = f; } return f; }
$global.$haxeUID |= 0;
Main.main();
})(typeof window != "undefined" ? window : typeof global != "undefined" ? global : typeof self != "undefined" ? self : this);