// ==UserScript==
// @name         BDWM-Hide
// @namespace    http://tampermonkey.net/
// @version      0.4
// @description  北大未名根据版面名称，屏蔽版面
// @author       lanvent
// @match        https://bbs.pku.edu.cn/v2/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=pku.edu.cn
// @grant        GM_addStyle
// @grant        GM_setValue
// @grant        GM_getValue
// @license      MIT
// @downloadURL none
// ==/UserScript==

let blockWords = GM_getValue('BDWM_blockblocks', []);

function setBlockWords(str){
    blockWords = str.replace('，',',').split(',').map(word => word.trim()).filter(word => word.length > 0);
    GM_setValue('BDWM_blockblocks', blockWords);
    if( blockWords.length == 0){
        return;
    }
    removeBoardBlocks();
    removeTitles();
}

function setBlockWordsPrompt() {
    const userInput = prompt('请输入要屏蔽的版面名称，用逗号分隔:', blockWords.join(', '));
    if (userInput !== null) {
        setBlockWords(userInput);
    }
}

function addSettingsButton() {
    const container = document.querySelector('div.extend-menu.setting-extend-menu > div.content');
    if(container == null || container.querySelector('a[name="block-keywords-button"]')){
        return;
    }
    const settingsButton = document.createElement('a');
    settingsButton.textContent = '屏蔽版面设置';
    settingsButton.name = 'block-keywords-button';
    settingsButton.addEventListener('click', function(event) {
        event.preventDefault();
        setBlockWordsPrompt();
    });
    const logoutButton = container.querySelector('a.btn-logout');
    container.insertBefore(settingsButton,logoutButton);
}

function addCustomSettingRow() {
    const form = document.getElementById('preference-form');
    if(form==null || form.querySelector('input[name="block-keywords"]')){
        return;
    }
    const settingRow = document.createElement('div');
    settingRow.className = 'form-row';
    settingRow.innerHTML = `
            <label>屏蔽版面名称</label>
            <div style="display: inline-block">
                    <input type="text" name="block-keywords" placeholder="输入关键词，用逗号分隔" style="margin: 1px 0;
    padding: 0 0 0 0px;
    height: 28px;
    line-height: 28px;
    width: 338px;
    border: 1px solid #e5e5e5;
    border-radius: 5px;
    text-indent: 10px"/>
            </div>
        `;
    blockWords.join(', ')
    const submitButtonRow = form.querySelector('.extra-margin-top');
    form.insertBefore(settingRow, submitButtonRow);
    const keywordsInput = settingRow.querySelector('input[name="block-keywords"]');
    keywordsInput.value = blockWords.join(', ');
    const applyButton = form.querySelector('.orange-large-btn');
    applyButton.addEventListener('click', function(event){
        setBlockWords(keywordsInput.value);
    });
}

function removeBoardBlocks() {
    //版面
    let boardBlocks = document.querySelectorAll('.boards-wrapper.list > div.set');
    if(boardBlocks!=null){
        boardBlocks.forEach(block => {
            let content = block.querySelector('span.name').textContent;
            if (content && blockWords.some(word => word===content)){
                console.log("remove",block);
                block.remove();
            }
        });
    }
    boardBlocks = document.querySelectorAll('.boards-wrapper.hots > div.board-block');
    if(boardBlocks!=null){
        boardBlocks.forEach(block => {
            let content = block.querySelector('span.name').textContent;
            if (content && blockWords.some(word => word===content)){
                console.log("remove",block);
                block.remove();
            }
        });
    }
}

function removeTitles() {
    //主页榜单
    let titles = document.querySelectorAll('li');
    if(titles){
        titles.forEach(title => {
            let content = title.querySelector('a.post-link')?.textContent;
            if (content && blockWords.some(word => content.startsWith(word+' '))){
                console.log("remove",title);
                title.remove();
            }
            content = title.querySelector('a.topic-link')?.textContent;
            if (content && blockWords.some(word => content.startsWith('['+word+']'))){
                console.log("remove",title);
                title.remove();
            }
        });
    }
    titles = document.querySelectorAll('p > a.topic-link');
    if(titles){
        titles.forEach(title => {
            if (blockWords.some(word => title.textContent.startsWith('['+word+']'))){
                console.log("remove",title);
                title.remove();
            }
        });
    }
    titles = document.querySelectorAll('a.inline-link');
    if(titles){
        titles.forEach(title => {
            if (blockWords.some(word => title.textContent.startsWith('['+word+']'))){
                console.log("remove",title);
                title.remove();
            }
        });
    }
}
(function() {
    'use strict';
    const config = { childList: true, subtree: true };
    const observer = new MutationObserver(mutations => {
        mutations.forEach(mutation => {
            if (mutation.type === 'childList') {
                observer.disconnect();
                addSettingsButton();
                addCustomSettingRow();
                observer.observe(document.body, config);
                removeBoardBlocks();
                removeTitles();
            }
        });
    });
    observer.observe(document.body, config);
})();