// ==UserScript==
// @name		Ruten - navigate by keyboard
// @name:zh-TW	露天拍賣 鍵盤導覽
// @description			In search result, change page by keyboard. [a / ←]:prev page, [d / →]:next page. Search products in Ruten as default (exclude ebay, Rakuten).
// @description:zh-TW	搜尋結果用鍵盤翻頁，[a / ←]前一頁，[d / →]下一頁。搜尋時預設只找露天站內商品（排除 ebay, 樂天）
// @namespace	https://greasyfork.org/zh-TW/users/393133-evan-tseng
// @version		0.4
// @author		Evan Tseng
// @match		*.ruten.com.tw/*
// @grant		none
// @downloadURL none
// ==/UserScript==

(function() {
	'use strict';

	var fnKey = { shift: false, ctrl:false, alt:false, meta:false };
	window.onfocus = function() { fnKey.shift = fnKey.ctrl = fnKey.alt = fnKey.meta = false; }

	document.addEventListener("keyup", function(e) {
		e = e || window.event;
		switch(e.which || e.keyCode) {
			case 16: // shift
				fnKey.shift = false;
				break;
			case 17: // ctrl
				fnKey.ctrl = false;
				break;
			case 18: // alt
				fnKey.alt = false;
				break;
			case 91: // left Meta
			case 93: // right Meta
				fnKey.meta = false;
				break;
		}
	});

	document.addEventListener("keydown", async function(e) {
		if(document.querySelector("input:focus, textarea:focus") || (fnKey.shift | fnKey.ctrl | fnKey.alt | fnKey.meta)) return;
		e = e || window.event;
		try{
			switch(e.which || e.keyCode) {
				case 16: // shift
					fnKey.shift = true;
					break;
				case 17: // ctrl
					fnKey.ctrl = true;
					break;
				case 18: // alt
					fnKey.alt = true;
					break;
				case 91: // left Meta
				case 93: // right Meta
					fnKey.meta = true;
					break;
				case 39: // right
				case 68: // 'd'
					document.querySelector(".pagination .next, .rt-pagination li.next a, .rt-store-pagination li.next>a, .rt-jqmodal-panel .img-popup-content .rti-chevron-right-default").click();
					break;
				case 37: // left
				case 65: // 'a'
					document.querySelector(".pagination .prev, .rt-pagination li.prev a, .rt-store-pagination li.prev>a, .rt-jqmodal-panel .img-popup-content .rti-chevron-left-default").click();
					break;
				case 38: // up
				case 87: // 'w'
					document.querySelector(".item-gallery-main-image img.js-main-img").click();
					break;
				case 13: // enter
				case 27: // esc
					document.querySelector(".rt-jqmodal-jqmClose").click();
			}
		} catch(e){}
	});

	if(window.location.href.indexOf('//find.ruten.com.tw/s/?')>0) {
		var watchElm=null;
		const watchOpt = { 'attributes': true },
			  redir = function(){
				  if(window.location.href.search(/(area=|platform=)/)==-1){
					  window.location.href=window.location.href+"&platform=ruten";
				  }
			  },
			  observer = new MutationObserver(redir);

		redir();
		let waitt=window.setInterval(function(){
			if(watchElm=document.querySelector("#ProdGridContainer")){
				observer.observe(watchElm, watchOpt);
				clearInterval(waitt);
			}
		},500);
	}

})();