// ==UserScript==
// @name         bili直播助手
// @namespace    https://github.com/wakefun
// @author       醒悦哥哥
// @description  浏览器去除直播页面遮挡块。绕过b站强制直播姬开播限制，修复OBS无法获取推流码的问题。自动点赞功能。
// @version      3.0.3
// @match        https://link.bilibili.com/p/center/index*
// @match        https://live.bilibili.com/*
// @icon         https://i1.hdslb.com/bfs/face/ec3c19295a9ce487bdf670174fd7eaa1da690923.jpg@256w_256h.jpg
// @run-at       document-idle
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    const MASK_ID = 'web-player-module-area-mask-panel';
    const START_LIVE_URL = 'room/v1/Room/startLive';

    // --- 去除直播播放器遮挡 ---

    function observeMask() {
        const player = document.getElementById('live-player');
        if (!player) return;

        // 先清除已存在的遮挡
        document.getElementById(MASK_ID)?.remove();

        new MutationObserver((mutations) => {
            for (const { addedNodes } of mutations) {
                for (const node of addedNodes) {
                    if (node.nodeType !== Node.ELEMENT_NODE) continue;
                    const mask = node.id === MASK_ID ? node : node.querySelector?.(`#${MASK_ID}`);
                    if (mask) {
                        mask.remove();
                        console.log('[bili-live] 已去除遮挡');
                    }
                }
            }
        }).observe(player, { childList: true, subtree: true });
    }

    // DOM 可能尚未完全就绪，延迟重试
    if (document.getElementById('live-player')) {
        observeMask();
    } else {
        const retry = setInterval(() => {
            if (document.getElementById('live-player')) {
                clearInterval(retry);
                observeMask();
            }
        }, 500);
        // 30s 后放弃
        setTimeout(() => clearInterval(retry), 30000);
    }

    // --- 自动点赞 ---

    const AUTO_LIKE_MAX = 1000;
    const AUTO_LIKE_INTERVAL = 666;
    const LIKE_WRAPPER_ID = '__auto-like-wrapper__';
    const LIKE_BTN_HOST_SELECTOR = '#chat-control-panel-vm div.superChat div.icon-left-part';
    const LIKE_WATCH_INTERVAL = 3000;

    let _likeTimer = null;
    let _likeCount = 0;
    let _likeObserver = null;
    let _likeObserveRoot = null;
    let _likeWatchTimer = null;

    function simulateLikeKey() {
        const opts = { key: 'k', code: 'KeyK', bubbles: true };
        document.dispatchEvent(new KeyboardEvent('keydown', opts));
        document.dispatchEvent(new KeyboardEvent('keyup', opts));
    }

    function stopLike() {
        clearInterval(_likeTimer);
        _likeTimer = null;
        const wrapper = document.getElementById(LIKE_WRAPPER_ID);
        if (wrapper) {
            const btn = wrapper.querySelector('button');
            const tip = wrapper.querySelector('span');
            if (btn) { btn.textContent = '自动点赞'; btn.style.background = '#fff'; btn.style.color = '#999'; const ants = btn.querySelector('div'); if (ants) { ants.style.opacity = '0'; ants.style.animation = ''; } }
            if (tip) tip.textContent = '';
        }
        console.log(`[bili-live] 自动点赞停止，共点赞 ${_likeCount} 次`);
        _likeCount = 0;
    }

    function startLike() {
        _likeCount = 0;
        const wrapper = document.getElementById(LIKE_WRAPPER_ID);
        if (wrapper) {
            const btn = wrapper.querySelector('button');
            const tip = wrapper.querySelector('span');
            if (btn) { btn.textContent = '停止点赞'; btn.style.background = '#00a1d6'; btn.style.color = '#fff'; const ants = btn.querySelector('div'); if (ants) { ants.style.opacity = '0'; ants.style.animation = ''; } }
            if (tip) tip.textContent = '发弹幕时点赞会暂停，点击其他区域可恢复';
        }
        _likeTimer = setInterval(() => {
            if (_likeCount >= AUTO_LIKE_MAX) return stopLike();
            simulateLikeKey();
            _likeCount++;
        }, AUTO_LIKE_INTERVAL);
    }

    function injectLikeBtn() {
        if (document.getElementById(LIKE_WRAPPER_ID)) return;
        const host = document.querySelector(LIKE_BTN_HOST_SELECTOR);
        if (!host) return;

        if (!document.getElementById('__auto-like-style__')) {
            const style = document.createElement('style');
            style.id = '__auto-like-style__';
            style.textContent = `@keyframes __like-btn-march { to { background-position: 8px 0, 100% 8px, -8px 100%, 0 -8px; } }`;
            document.head.appendChild(style);
        }

        const wrapper = document.createElement('div');
        wrapper.id = LIKE_WRAPPER_ID;
        Object.assign(wrapper.style, {
            display: 'flex', alignItems: 'center',
        });

        const btn = document.createElement('button');
        btn.textContent = _likeTimer ? '停止点赞' : '自动点赞';
        Object.assign(btn.style, {
            padding: '8px 10px', cursor: 'pointer', marginLeft: '2px',
            border: 'none', borderRadius: '4px',
            background: _likeTimer ? '#00a1d6' : '#fff',
            color: _likeTimer ? '#fff' : '#999',
            fontSize: '12px', transition: 'background 0.25s ease, color 0.25s ease',
            position: 'relative',
        });
        btn.addEventListener('mouseenter', () => {
            if (_likeTimer) return;
            btn.style.background = '#00a1d6';
            btn.style.color = '#fff';
        });
        btn.addEventListener('mouseleave', () => {
            if (_likeTimer) return;
            btn.style.background = '#fff';
            btn.style.color = '#999';
        });

        // 跑马灯虚线边框（CSS 渐变顺时针流动）
        const ants = document.createElement('div');
        Object.assign(ants.style, {
            position: 'absolute', top: '0', left: '0', width: '100%', height: '100%',
            pointerEvents: 'none', borderRadius: '4px',
            opacity: '0', transition: 'opacity 0.25s ease',
            backgroundImage: [
                'repeating-linear-gradient(90deg, #fff 0 4px, transparent 4px 8px)',
                'repeating-linear-gradient(180deg, #fff 0 4px, transparent 4px 8px)',
                'repeating-linear-gradient(90deg, #fff 0 4px, transparent 4px 8px)',
                'repeating-linear-gradient(180deg, #fff 0 4px, transparent 4px 8px)',
            ].join(','),
            backgroundSize: '100% 1px, 1px 100%, 100% 1px, 1px 100%',
            backgroundPosition: '0 0, 100% 0, 0 100%, 0 0',
            backgroundRepeat: 'no-repeat',
        });
        btn.append(ants);

        btn.addEventListener('mouseenter', () => {
            if (_likeTimer) return;
            ants.style.opacity = '1';
            ants.style.animation = '__like-btn-march 1s linear infinite';
        });
        btn.addEventListener('mouseleave', () => {
            if (_likeTimer) return;
            ants.style.opacity = '0';
            ants.style.animation = '';
        });

        const tip = document.createElement('span');
        Object.assign(tip.style, {
            marginLeft: '6px', fontSize: '11px', color: '#999',
        });
        if (_likeTimer) tip.textContent = '发弹幕时点赞会暂停，点击其他区域可恢复';

        btn.addEventListener('click', () => _likeTimer ? stopLike() : startLike());
        wrapper.append(btn, tip);
        host.appendChild(wrapper);
    }

    function disconnectLikeObserver() {
        if (_likeObserver) {
            _likeObserver.disconnect();
            _likeObserver = null;
        }
        _likeObserveRoot = null;
    }

    function bindLikeObserver() {
        const host = document.querySelector(LIKE_BTN_HOST_SELECTOR);
        const root = host?.parentElement;
        if (!root) return;

        if (_likeObserver && _likeObserveRoot === root) return;

        disconnectLikeObserver();
        _likeObserveRoot = root;
        _likeObserver = new MutationObserver(() => injectLikeBtn());
        _likeObserver.observe(root, { childList: true, subtree: true });
    }

    function ensureLikeFeatureMounted() {
        injectLikeBtn();
        bindLikeObserver();
    }

    ensureLikeFeatureMounted();
    _likeWatchTimer = setInterval(ensureLikeFeatureMounted, LIKE_WATCH_INTERVAL);

    window.addEventListener('beforeunload', () => {
        clearInterval(_likeWatchTimer);
        disconnectLikeObserver();
    });

    // --- 绕过强制直播姬开播限制（伪装 platform） ---

    function patchStartLiveBody(body) {
        const params = new URLSearchParams(body);
        params.set('platform', 'android_link');
        return params.toString();
    }

    // 拦截 XHR
    const origXHROpen = XMLHttpRequest.prototype.open;
    XMLHttpRequest.prototype.open = function (method, url, ...rest) {
        if (method === 'POST' && url.includes(START_LIVE_URL)) {
            const origSend = this.send;
            this.send = function (body) {
                origSend.call(this, patchStartLiveBody(body));
            };
        }
        origXHROpen.call(this, method, url, ...rest);
    };

    // 拦截 fetch
    const origFetch = window.fetch;
    window.fetch = function (input, init) {
        const url = typeof input === 'string' ? input : input?.url;
        if (url?.includes(START_LIVE_URL) && init?.method?.toUpperCase() === 'POST' && init.body) {
            init = { ...init, body: patchStartLiveBody(init.body) };
        }
        return origFetch.call(this, input, init);
    };

})();