// ==UserScript==
// @name         hipda-ID笔记
// @namespace    http://tampermonkey.net/
// @version      0.7.4
// @description  来自地板带着爱，记录上网冲浪的美好瞬间
// @author       屋大维
// @license      MIT
// @match        https://www.hi-pda.com/forum/*
// @match        https://www.4d4y.com/forum/*
// @resource     IMPORTED_CSS https://code.jquery.com/ui/1.13.0/themes/base/jquery-ui.css
// @require      https://code.jquery.com/jquery-3.4.1.min.js
// @require      https://code.jquery.com/ui/1.13.0/jquery-ui.js
// @icon         https://icons.iconarchive.com/icons/iconshock/real-vista-project-managment/64/task-notes-icon.png
// @grant        GM.setValue
// @grant        GM.getValue
// @grant        GM.deleteValue
// @grant        GM_getResourceText
// @grant        GM_addStyle
// @grant        GM.xmlHttpRequest
// @downloadURL none
// ==/UserScript==

(function ()
{
	'use strict';
	// CONST
	const SERVER_ENDPOINT = 'https://hp-notebook-server.onrender.com';
	const BROWSER_KEY = 'alt+I';
	const MANAGEMENT_KEY = "alt+U";

	// CSS
	const my_css = GM_getResourceText("IMPORTED_CSS");
	GM_addStyle(my_css);
	GM_addStyle(".no-close .ui-dialog-titlebar-close{display:none} textarea{height:100%;width:100%;-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box} .card{box-shadow:0 4px 8px 0 rgba(0,0,0,.2);transition:.3s;width:100%;overflow-y: scroll;}.card:hover{box-shadow:0 8px 16px 0 rgba(0,0,0,.2)}.container{padding:2px 16px}");
	GM_addStyle(".flex-container{display:flex;flex-wrap: wrap;}.flex-container>div{background-color:#f1f1f1;width:500px;max-height:500px;margin:15px; padding:5px;text-align:left;}");

	// Your code here...
	// helpers
	function getKeys(e)
	{ // keycode 转换
		var codetable = {
			'96': 'Numpad 0',
			'97': 'Numpad 1',
			'98': 'Numpad 2',
			'99': 'Numpad 3',
			'100': 'Numpad 4',
			'101': 'Numpad 5',
			'102': 'Numpad 6',
			'103': 'Numpad 7',
			'104': 'Numpad 8',
			'105': 'Numpad 9',
			'106': 'Numpad *',
			'107': 'Numpad +',
			'108': 'Numpad Enter',
			'109': 'Numpad -',
			'110': 'Numpad .',
			'111': 'Numpad /',
			'112': 'F1',
			'113': 'F2',
			'114': 'F3',
			'115': 'F4',
			'116': 'F5',
			'117': 'F6',
			'118': 'F7',
			'119': 'F8',
			'120': 'F9',
			'121': 'F10',
			'122': 'F11',
			'123': 'F12',
			'8': 'BackSpace',
			'9': 'Tab',
			'12': 'Clear',
			'13': 'Enter',
			'16': 'Shift',
			'17': 'Ctrl',
			'18': 'Alt',
			'20': 'Cape Lock',
			'27': 'Esc',
			'32': 'Spacebar',
			'33': 'Page Up',
			'34': 'Page Down',
			'35': 'End',
			'36': 'Home',
			'37': '←',
			'38': '↑',
			'39': '→',
			'40': '↓',
			'45': 'Insert',
			'46': 'Delete',
			'144': 'Num Lock',
			'186': ';:',
			'187': '=+',
			'188': ',<',
			'189': '-_',
			'190': '.>',
			'191': '/?',
			'192': '`~',
			'219': '[{',
			'220': '\|',
			'221': ']}',
			'222': '"'
		};
		var Keys = '';
		e.shiftKey && (e.keyCode != 16) && (Keys += 'shift+');
		e.ctrlKey && (e.keyCode != 17) && (Keys += 'ctrl+');
		e.altKey && (e.keyCode != 18) && (Keys += 'alt+');
		return Keys + (codetable[e.keyCode] || String.fromCharCode(e.keyCode) || '');
	};

	function addHotKey(codes, func)
	{ // 监视并执行快捷键对应的函数
		document.addEventListener('keydown', function (e)
		{
			if ((e.target.tagName != 'INPUT') && (e.target.tagName != 'TEXTAREA') && getKeys(e) == codes)
			{
				func();
				e.preventDefault();
				e.stopPropagation();
			}
		}, false);
	};

	function htmlToElement(html)
	{
		var template = document.createElement('template');
		html = html.trim(); // Never return a text node of whitespace as the result
		template.innerHTML = html;
		return template.content.firstChild;
	}

	function getEpoch(date_str, time_str)
	{
		let [y, m, d] = date_str.split("-").map(x => parseInt(x));
		let [H, M] = time_str.split(":").map(x => parseInt(x));
		return new Date(y, m - 1, d, H, M, 0).getTime() / 1000;
	}

	// classes
	class HpThread
	{
		constructor()
		{}

		getThreadTid()
		{
			return location.href.match(/tid=(\d+)/) ? parseInt(location.href.match(/tid=(\d+)/)[1]) : -999;
		}

		getUserUid()
		{
			return parseInt($("cite > a").attr("href").split("uid=")[1]);
		}

		getThreadTitle()
		{
			let l = $('#nav').text().split(" » ");
			return l[l.length - 1];
		}

		getHpPosts()
		{
			let threadTid = this.getThreadTid();
			let threadTitle = this.getThreadTitle();
			let divs = $('#postlist > div').get();
			return divs.map(d => new HpPost(threadTid, threadTitle, d));
		}

		addNoteBrowserUI(_notebook)
		{
			$('#menu>ul').append($(`<li class="menu_2"><a href="javascript:void(0)" hidefocus="true" id="noteButton_browser">搜索笔记</a></li>`));
			var that = this;
			// create dialog
			let dialog = htmlToElement(`
              <div id="noteDialog_browser" style="display: none;">
                <div id="noteDialog_browser_search_bar" style="width: 80%; margin: 20px auto 20px auto;">
                    <select style="display: inline-block;" name="searchMethod" id="noteDialog_browser_search_method">
                        <option value="content">笔记内容</option>
                        <option value="userName">用户名</option>
                    </select>
                    <input type="text" autofocus="true" style="display: inline-block; width: 300px;" id="noteDialog_browser_search_input">
                </div>
                <div id="noteDialog_browser_note_list" style="width: 95%; margin: 10px auto 10px auto;" class="flex-container">
                </div>
              </div>
            `);
			$("body").append(dialog);

			function updateNoteList()
			{
				$('#noteDialog_browser_note_list').empty(); // remove all notes from the list
				var notes;
				var searchMethod = $('#noteDialog_browser_search_method').val();
				var searchInput = $('#noteDialog_browser_search_input').val();
				if (searchMethod === "userName")
				{
					notes = _notebook.getNotesByUsername(searchInput);
				}
				else if (searchMethod === "content")
				{
					notes = _notebook.getNotesByKeyword(searchInput);
				}
				else
				{
					return;
				}
				for (let i = 0; i < notes.length; i++)
				{
					let element = noteToHtmlElement(notes[i]);
					$('#noteDialog_browser_note_list').append(element);
				}
			}

			function noteToHtmlElement(note)
			{
				var searchMethod = $('#noteDialog_browser_search_method').val();
				var searchInput = $('#noteDialog_browser_search_input').val();
				var userName = note.userName;
				var uid = note.uid;
				var content = note.note;
				if (searchMethod === 'userName')
				{
					userName = userName.replaceAll(searchInput, '<mark class="highlight">$&</mark>');
				}
				if (searchMethod === 'content')
				{
					content = content.replaceAll(searchInput, '<mark class="highlight">$&</mark>');
				}
				// highlight all URLs
				var expression = /https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)?/gi;
				var regex = new RegExp(expression);
				content = content.replace(regex, '<a style="color:blue;" href="$&" target="_blank">$&</a>')

				var html = `
                <div class="card">
                    <div style="font-size: 2em; float: left; margin: 10px;">${userName}</div>
                    <div style="float: right;">
                        <button class="noteEditButton">编辑</button>
                        <button class="noteDeleteButton" style="margin-right: 2px;">删除</button>
                    </div>
                    <div class="container" style="word-break: break-all; white-space: pre-wrap;">
                    ${content}
                    </div>
                </div>
                `;
				var element = $(html);
				// delete
				element.find("button.noteDeleteButton").click(function ()
				{
					let r = confirm(`确定要删除 ${note.userName} 的ID笔记吗？`);
					if (!r)
					{
						return;
					}
					_notebook.delete(uid);
					updateNoteList();
				});
				// edit
				element.find("button.noteEditButton").click(function ()
				{
					// note dialog (this will be different from the one opened in posts)
					let dialog = htmlToElement(`
                        <div id="noteDialog_${uid}" style="display: none;">
                        <textarea rows="10" wrap="hard" placeholder="暂时没有笔记">
                        </div>
                    `);
					$("body").append(dialog);

					// bind event listener
					console.log("open note for", userName);
					// freshly fetched from DB
					$(`#noteDialog_${uid}`).find('textarea').first().val(_notebook.get(uid));
					$(`#noteDialog_${uid}`).dialog(
					{
						title: `ID笔记：${userName}`,
						dialogClass: "no-close",
						closeText: "hide",
						closeOnEscape: true,
						height: Math.max(parseInt($(window).height() * 0.4), 350),
						width: Math.max(parseInt($(window).width() * 0.4), 600),
						buttons: [
						{
							text: "确认",
							click: function ()
							{
								// save the new note before close
								let newNote = $(`#noteDialog_${uid}`).find('textarea').first().val();
								if (newNote.length === 0)
								{
									_notebook.delete(uid);
								}
								else
								{
									_notebook.put(uid, userName, newNote);
								}
								$(this).dialog("close");
								// update the Note List
								updateNoteList();
							}
						},
						{
							text: "取消",
							click: function ()
							{
								// close without saving
								$(this).dialog("close");
							}
						}]
					});

				});
				return element;
			}

			function openBrowser()
			{
				$('#menu>ul>li').first().removeClass("current");
				$('#menu>ul>li').first().addClass("menu_2");
				$('#noteButton_browser').parent().removeClass("menu_2");
				$('#noteButton_browser').parent().addClass("current");
				console.log("open notebook browser dialog");

				$(`#noteDialog_browser`).dialog(
				{
					title: "ID笔记：浏览器",
					modal: true,
					height: parseInt($(window).height() * 0.8),
					width: parseInt($(window).width() * 0.8),
					closeOnEscape: true,
					open: function (event, ui)
					{
						$('.ui-widget-overlay').css("background-color", "black");
						$('.ui-widget-overlay').css("opacity", "0.6");
					},
					close: function (event, ui)
					{
						$('#menu>ul>li').first().removeClass("menu_2");
						$('#menu>ul>li').first().addClass("current");
						$('#noteButton_browser').parent().removeClass("current");
						$('#noteButton_browser').parent().addClass("menu_2");
					}
				});
			}

			$(document).ready(function ()
			{
				$('#noteDialog_browser_search_input').on("input", () =>
				{
					updateNoteList();
				});
				$('#noteDialog_browser_search_method').change(() =>
				{
					updateNoteList();
				});
				$(document).on("click", `#noteButton_browser`, function ()
				{
					openBrowser();
				});
				// HOTKEY
				addHotKey(BROWSER_KEY, openBrowser);
			});

		}

		addNoteManagementUI(_notebook)
		{
			var that = this;
			var button = htmlToElement(`
              <button id="noteButton_management">
                <span><img src="https://icons.iconarchive.com/icons/iconshock/real-vista-project-managment/32/task-notes-icon.png"></img></span>
              </button>
            `);

			// create dialog
			let dialog = htmlToElement(`
              <div id="noteDialog_management" style="display: none;">
                <h3>hipda-ID笔记 v${GM_info.script.version}</h3>
                <p style="margin: 10px auto 10px auto;">来自地板带着爱</p>
                <p id="noteStat" style="margin: 10px auto 10px auto;"></p>
                <div>
                  <button id="noteButton_import">导入</button>
                  <button id="noteButton_export">导出</button>
                  <button id="noteButton_reset">重置</button>
                  <button id="noteButton_migrate">4d4y</button>
                  <button id="noteButton_server">服务器</button>
                  <input type="hidden" autofocus="true" />
                </div>
              </div>
            `);
			$("body").append(dialog);

			function updateNoteStat()
			{
				let note_stat = _notebook.getNotebookStat();
				let synced = _notebook._synced;
				$(`#noteStat`).text(`共${note_stat.note_number}条ID笔记，大小为${(note_stat.size_kb).toFixed(2)}KB${synced ? " (已同步)" : ""}`);
			}

			function openManagement()
			{
				console.log("open notebook management dialog");
				// update statistics
				updateNoteStat();

				$(`#noteDialog_management`).dialog(
				{
					title: "ID笔记：管理面板",
					height: 200,
					width: 300,
					closeOnEscape: true,
				});
			}

			$(document).ready(function ()
			{
				$(document).on("click", "#noteButton_server", async function ()
				{
					let apiKey = await _notebook.getApiKey();
					let data = prompt("请将 API Key 输入文本框：", apiKey ? apiKey : "");
					if (data !== null)
					{
						// try to load
						try
						{
							_notebook.setApiKey(data);
						}
						catch (err)
						{
							alert("格式错误！" + err);
							return;
						}
						alert("导入成功！");
					}
				});
				$(document).on("click", "#noteButton_migrate", function ()
				{
					let r = confirm("确定要从hi-pda迁移到4d4y吗？");
					if (!r)
					{
						return;
					}
					_notebook.migrate();
					alert("迁移成功！");
				});
				$(document).on("click", "#noteButton_import", function ()
				{
					let r = confirm("确定要导入ID笔记吗？现有笔记将会被覆盖！");
					if (!r)
					{
						return;
					}

					// prompt cannot handle large file, extend it in the future
					let data = prompt("请将 id笔记.json 中的文本复制粘贴入文本框：");
					if (data !== null)
					{
						// try to load
						try
						{
							let j = JSON.parse(data);
							_notebook.importNotebook(j);
						}
						catch (err)
						{
							alert("格式错误！" + err);
							return;
						}
						alert("导入成功！");
						updateNoteStat();
					}
				});
				$(document).on("click", "#noteButton_export", async function ()
				{
					let r = confirm("确定要导出ID笔记吗？");
					if (!r)
					{
						return;
					}
					let a = document.createElement("a");
					let data = await _notebook.exportNotebook();
					a.href = "data:text," + encodeURIComponent(data);
					a.download = "id笔记.json";
					a.click();
				});
				$(document).on("click", "#noteButton_reset", function ()
				{
					let r = confirm("确定要清空ID笔记吗？");
					if (!r)
					{
						return;
					}
					_notebook.resetNotebook();
					alert("ID笔记已经清空！");
					updateNoteStat();
				});
				$(document).on("click", `#noteButton_management`, function ()
				{
					openManagement();
				});
				// HOTKEY
				addHotKey(MANAGEMENT_KEY, openManagement);
			});

			// add UI
			let d = $("td.modaction").last();
			d.append(button);

		}

	}

	class HpPost
	{
		constructor(threadTid, threadTitle, postDiv)
		{
			this.threadTid = threadTid;
			this.threadTitle = threadTitle;
			this._post_div = postDiv;
		}

		getPostAuthorName()
		{
			return $(this._post_div).find("div.postinfo > a").first().text();
		}

		getPostAuthorUid()
		{
			return parseInt($(this._post_div).find("div.postinfo > a").first().attr("href").split("uid=")[1]);
		}

		getPostPid()
		{
			return parseInt($(this._post_div).attr("id").split("_")[1]);
		}

		getGotoUrl()
		{
			// return `https://www.hi-pda.com/forum/redirect.php?goto=findpost&ptid=${this.threadTid}&pid=${this.getPostPid()}`;
			return `https://www.4d4y.com/forum/redirect.php?goto=findpost&ptid=${this.threadTid}&pid=${this.getPostPid()}`;
		}

		getPostContent()
		{
			// get text without quotes
			let t = $(this._post_div).find("td.t_msgfont").first().clone();
			t.find('.quote').replaceWith("<p>【引用内容】</p>");
			t.find('.t_attach').replaceWith("<p>【附件】</p>");
			t.find('img').remove();
			let text = t.text().replace(/\n+/g, "\n").trim();
			return text;
		}

		getPostBrief(n)
		{
			let content = this.getPostContent();
			if (content.length <= n)
			{
				return content;
			}
			return content.slice(0, n) + "\n\n【以上为截取片段】";
		}

		getOriginalTimestamp(use_string = false)
		{
			let dt = $(this._post_div).find("div.authorinfo > em").text().trim().split(" ").slice(1, 3);
			if (use_string)
			{
				return dt.join(" ");
			}
			return getEpoch(dt[0], dt[1]);
		}

		getLastTimestamp(use_string = false)
		{
			let ele = $(this._post_div).find("i.pstatus").get();
			if (ele.length !== 0)
			{
				let dt = $(this._post_div).find("i.pstatus").text().trim().split(" ").slice(3, 5);
				if (use_string)
				{
					return dt.join(" ");
				}
				return getEpoch(dt[0], dt[1]);
			}
			return null;
		}

		getTimestamp(use_string = false)
		{
			// get last edit time
			let lastTimestamp = this.getLastTimestamp(use_string);
			return lastTimestamp ? lastTimestamp : this.getOriginalTimestamp(use_string);
		}

		addNoteUI(_notebook)
		{
			let uid = this.getPostAuthorUid();
			let index = $(this._post_div).index();
			let userName = this.getPostAuthorName();

			var that = this;
			// create an UI element which contains data and hooks
			// button
			let button = htmlToElement(`
              <button id="noteButton_${index}" style="color:grey; margin-left:20px;">
                ID笔记
              </button>
            `);
			// note dialog
			let dialog = htmlToElement(`
              <div id="noteDialog_${index}" style="display: none;">
                <textarea rows="10" wrap="hard" placeholder="暂时没有笔记">
              </div>
            `);
			$("body").append(dialog);

			// add event to button
			$(document).ready(function ()
			{
				$(document).on("click", `#noteButton_${index}`, async function ()
				{
					// try to sync DB
					if (!_notebook._synced)
					{
						try
						{
							await _notebook.sync_server(uid);
						}
						catch (err)
						{
							console.log(err);
						}
					}
					console.log("open note for", userName);
					// freshly fetched from DB
					$(`#noteDialog_${index}`).find('textarea').first().val(_notebook.get(uid));
					$(`#noteDialog_${index}`).dialog(
					{
						title: `ID笔记：${userName}`,
						dialogClass: "no-close",
						closeText: "hide",
						closeOnEscape: true,
						height: Math.max(parseInt($(window).height() * 0.4), 350),
						width: Math.max(parseInt($(window).width() * 0.4), 600),
						buttons: [
						{
							text: "插入当前楼层",
							click: function ()
							{
								let txt = $(`#noteDialog_${index}`).find('textarea').first();
								var caretPos = txt[0].selectionStart;
								var textAreaTxt = txt.val();
								var txtToAdd = `\n====\n引用: ${that.getGotoUrl()}\n【${that.getTimestamp(true)}】\n${that.getPostAuthorName()} 在《${that.threadTitle}》中说：\n ${that.getPostBrief(200)}\n====\n`;
								txt.val(textAreaTxt.substring(0, caretPos) + txtToAdd + textAreaTxt.substring(caretPos));
							}
						},
						{
							text: "确认",
							click: function ()
							{
								// save the new note before close
								let newNote = $(`#noteDialog_${index}`).find('textarea').first().val();
								if (newNote.length === 0)
								{
									_notebook.delete(uid);
								}
								else
								{
									_notebook.put(uid, userName, newNote);
								}
								$(this).dialog("close");
							}
						},
						{
							text: "取消",
							click: function ()
							{
								// close without saving
								$(this).dialog("close");
							}
						}]
					});
				});
			});

			// add UI
			let d = $(this._post_div).find("td[rowspan='2'].postauthor").first();
			d.append(button);
		}

	}

	class NotebookClient
	{
		// used to connect to the server
		constructor(UID, apiKey)
		{
			this.endpoint = SERVER_ENDPOINT;
			this.UID = String(UID);
			this.apiKey = apiKey;
		}

		get()
		{
			return new Promise((resolve, reject) =>
			{
				GM.xmlHttpRequest(
				{
					method: "GET",
					url: `${this.endpoint}/get?UID=${this.UID}&key=${this.apiKey}`,
					onload: function (response)
					{
						let data = response.responseText;
						if (response.status === 200)
						{
							resolve(data);
						}
						else
						{
							reject(data);
						}
					}
				});
			});
		}

		put(payload)
		{
			return new Promise((resolve, reject) =>
			{
				let d = {
					UID: this.UID,
					key: this.apiKey,
					note: payload
				};
				GM.xmlHttpRequest(
				{
					method: "POST",
					url: `${this.endpoint}/put`,
					data: JSON.stringify(d),
					headers:
					{
						"Content-Type": "application/json"
					},
					onload: function (response)
					{
						let data = response.responseText;
						if (response.status === 200)
						{
							resolve(data);
						}
						else
						{
							reject(data);
						}
					}
				});
			});

		}

	}

	class Notebook
	{
		// notebook data structure:
		//     this._notebook[uid] = {uid, userName, note};
		constructor(UID)
		{
			// initialization
			this._name = "hipda-notebook";
			this._keyname = "hipda-notebook-key";
			this._timestamp_name = "hipda-notebook-timestamp";
			this._uid = UID;
			this._key = null;
			this._client = null;
			this._notebook = {};
			this._synced = false;
			return (async () =>
			{
				this.loadFromLocalStorage();
				this._key = await this.getApiKey();
				return this;
			})();
		}

		async sync_server()
		{
			if (GM.xmlHttpRequest === undefined)
			{
				console.log("浏览器不支持连接服务器");
				return;
			}
			if (this._key === null)
			{
				return;
			}
			let client = new NotebookClient(this._uid, this._key);
			let data;
			try
			{
				data = await client.get();
			}
			catch (err)
			{
				console.log(err);
				this._synced = true;
			}
			if (data === undefined)
			{
				// initialize in server
				let payload = await this.exportNotebook();
				let data = await client.put(payload);
				console.log("initialize record in server");
				console.log("server:", data);
			}
			else
			{
				// check timestamp
				let serverVal = JSON.parse(data);
				let serverTimestamp = serverVal.timestamp;
				let localTimestamp = await this.getTimestamp();
				if (localTimestamp === null || localTimestamp < serverTimestamp)
				{
					// import from server
					this.importNotebook(serverVal);
					console.log("import record from server");
				}
				else if (localTimestamp > serverTimestamp)
				{
					// push to server
					let payload = await this.exportNotebook();
					let data = await client.put(payload);
					console.log("update record in server");
					console.log("server:", data);
				}
				else
				{
					console.log("already up-to-date");
				}
			}
			this._synced = true;
		}

		async getTimestamp()
		{
			let data = await GM.getValue(this._timestamp_name, null);
			return data;
		}

		async setTimestamp()
		{
			await GM.setValue(this._timestamp_name, +new Date());
		}

		async getApiKey()
		{
			console.log("load ID Notebook API key from Local Storage");
			let data = await GM.getValue(this._keyname, null);
			return data;
		}

		async setApiKey(apiKey)
		{
			console.log("save ID Notebook API key to Local Storage");
			await GM.setValue(this._keyname, apiKey);
			this._key = apiKey;
		}

		async loadFromLocalStorage()
		{
			console.log("load ID Notebook from Local Storage");
			let data = await GM.getValue(this._name, null);
			if (data !== null)
			{
				this._notebook = JSON.parse(data);
			}
		}

		async saveToLocalStorage()
		{
			console.log("save ID Notebook to Local Storage");
			await GM.setValue(this._name, JSON.stringify(this._notebook));
			await this.setTimestamp();
			await this.sync_server();
		}

		put(uid, userName, note)
		{
			// we need userName here, so user can analyze notes even after export
			this._notebook[uid] = {
				uid,
				userName,
				note
			};
			this.saveToLocalStorage();
		}

		get(uid)
		{
			if (uid in this._notebook)
			{
				return this._notebook[uid].note;
			}
			return "";
		}

		delete(uid)
		{
			if (uid in this._notebook)
			{
				delete this._notebook[uid];
				this.saveToLocalStorage();
			}
		}

		getNotesByUsername(userName)
		{
			if (userName.length === 0)
			{
				return [];
			}

			function compareFn(a, b)
			{
				if (a.userName < b.userName)
				{
					return -1;
				}
				if (a.userName > b.userName)
				{
					return 1;
				}
				return 0;

			}
			return Object.values(this._notebook).filter(x => x.userName.toLocaleLowerCase().indexOf(userName.toLocaleLowerCase()) !== -1).sort(compareFn);
		}

		getNotesByKeyword(keyword)
		{
			if (keyword.length === 0)
			{
				return [];
			}

			function compareFn(a, b)
			{
				if (a.note < b.userName)
				{
					return -1;
				}
				if (a.userName > b.userName)
				{
					return 1;
				}
				return 0;

			}
			return Object.values(this._notebook).filter(x => x.note.toLocaleLowerCase().indexOf(keyword.toLocaleLowerCase()) !== -1).sort(compareFn);
		}

		async exportNotebook()
		{
			// can add meta data here
			let timestamp = await this.getTimestamp()
			let output = {
				notebook: this._notebook,
				version: GM_info.script.version,
				timestamp: timestamp
			};
			return JSON.stringify(output);
		}

		importNotebook(input)
		{
			let attrs = ['notebook', 'version', 'timestamp'];
			for (let i = 0; i < attrs.length; i++)
			{
				if (!input.hasOwnProperty(attrs[i]))
				{
					throw (`bad format: ${attrs[i]} does not exist`);
				}
			}
			this._notebook = {
				...input.notebook
			};
			this.saveToLocalStorage();
		}

		resetNotebook()
		{
			this._notebook = {};
			this.saveToLocalStorage();
		}

		getNotebookStat()
		{
			return {
				'note_number': Object.keys(this._notebook).length,
				'size_kb': (new TextEncoder().encode(this.exportNotebook())).length / 1024
			};
		}

		migrate()
		{
			// update all hi-pda urls to 4d4y urls
			Object.keys(this._notebook).forEach(uid =>
			{
				let oldVal = this._notebook[uid].note;
				let newVal = oldVal.replace('www.hi-pda.com/forum/', 'www.4d4y.com/forum/');
				this._notebook[uid].note = newVal;
			});
		}
	}

	async function main()
	{

		// get a thread object
		var THIS_THREAD = new HpThread();
		var notebook = await new Notebook(THIS_THREAD.getUserUid());

		// notebook browser
		THIS_THREAD.addNoteBrowserUI(notebook);
		// management panel
		THIS_THREAD.addNoteManagementUI(notebook);

		// render UI below
		// ID notes
		var hp_posts = THIS_THREAD.getHpPosts();
		for (let i = 0; i < hp_posts.length; i++)
		{
			let hp_post = hp_posts[i];
			try
			{
				hp_post.addNoteUI(notebook);
			}
			catch (e)
			{
				// deleted post, simply pass it
				console.log("unable to parse the post, pass");
			}

		}


	}

	main();


})();