// ==UserScript==
// @name         byr-signature
// @namespace    flowmemo
// @version      0.1.1
// @description  add signature for byr-forum
// @author       flowmemo
// @match        https://bbs.byr.cn/*
// @grant        GM_getValue
// @grant        GM_setValue
// @license      MIT
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';
    var defaultSig = '————\n' +
        '示例签名:' +
        '微博 [url=http://weibo.com/flowmemo]@flowmemo[/url] 现在主要写JavaScript. 关注广泛, 欢迎交流.';
    var id; // timeout id
    var div;
    function addSignature (sig) {
        var signature = GM_getValue('sig', defaultSig);
        console.log('/post');
        div = document.getElementById('post_content');
        if(!div) return;
        console.dir(div);
        console.log('change value');
        div.value += '\n' + signature;
        return true;
    }
    function polling() {
        window.clearTimeout(id); // clear timeout if it exist
        if (window.location.href.indexOf('/post') === -1) return;
        function cb () {
            if (addSignature()) {
                sigPanel();
                return;
            }
            id = setTimeout(cb, 300);
        }
        cb();
    }
    function sigPanel() {
        var div = document.createElement('div');
        var referNode = document.getElementsByClassName('post-list-item')[2];
        referNode.appendChild(div);

        console.log(div.outerHTML);
        div.outerHTML = '<br><div class="byr-signature">' +
            '<div class="post-m">byr-signature</div>' +
            '<textarea class="post-textarea"name="sig-content" placeholder="在此输入你的签名, 保存后刷新页面生效"></textarea><br>' +
            '<input name="saveSig" type="button" value="保存"></div>';
        var userSig = document.getElementsByName('sig-content')[0];
        userSig.value = GM_getValue('sig', defaultSig);
        var saveButton = document.getElementsByName('saveSig')[0];
        saveButton.onclick = function() {
            console.log(userSig.value);
            GM_setValue('sig', (userSig.value));
        };
    }
    if (window.location.href.indexOf('/post') > -1) polling();
    console.log('add change');
    window.addEventListener('hashchange', polling);
})();