// ==UserScript==
// @name         鱼C论坛自动签到
// @namespace    https://scriptcat.org/
// @version      2.1
// @description  脚本猫后台定时签到，基于页面签到链接
// @author       Fiallsnu
// @icon         https://fishc.com.cn/favicon.ico
// @crontab      * 11-23 once * *
// @connect      fishc.com.cn
// @grant        GM_xmlhttpRequest
// @grant        GM_notification
// @grant        GM_openInTab
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_log
// @license MIT
// ==/UserScript==

return new Promise((resolve, reject) => {

    // ==================== 配置 ====================
    const SIGN_PAGE = 'https://fishc.com.cn/plugin.php?id=k_misign:sign';
    const BASE_URL  = 'https://fishc.com.cn';
    const MAX_RETRY = 5;
    const TODAY     = new Date().toISOString().slice(0, 10);
    let retryCount  = 0;

    // ==================== 防重复签到 ====================
    if (GM_getValue('fishc_checkin', '') === TODAY) {
        GM_log('[鱼C] 今日已签到，跳过');
        GM_notification({
            title: '鱼C论坛：今日已签到',
            text: '今天已经签到过了，无需重复操作',
            timeout: 5000
        });
        resolve('今日已签到');
        return;
    }

    // ==================== 主流程 ====================
    function performCheckin() {
        GM_log('[鱼C] 开始签到流程...');

        GM_xmlhttpRequest({
            method: 'GET',
            url: SIGN_PAGE,
            headers: {
                'Accept': 'text/html,application/xhtml+xml,*/*',
                'Accept-Language': 'zh-CN,zh;q=0.9'
            },
            timeout: 15000,
            anonymous: false,
            onload: function (res) {
                if (res.status !== 200) {
                    handleError('签到页请求失败，状态码：' + res.status);
                    return;
                }

                var html = res.responseText || '';
                GM_log('[鱼C] 签到页获取成功，长度：' + html.length);

                // ---- 检测未登录 ----
                if (isNotLoggedIn(html)) {
                    GM_notification({
                        title: '鱼C论坛：未登录',
                        text: '请先登录鱼C论坛',
                        timeout: 10000,
                        onclick: function () {
                            GM_openInTab(BASE_URL + '/member.php?mod=logging&action=login');
                        }
                    });
                    reject('未登录');
                    return;
                }

                // ---- 检测已签到 ----
                if (isAlreadySigned(html)) {
                    GM_log('[鱼C] 今日已签到');
                    GM_setValue('fishc_checkin', TODAY);
                    GM_notification({
                        title: '鱼C论坛：今日已签到',
                        text: '今天已经签到过了',
                        timeout: 5000
                    });
                    resolve('今日已签到');
                    return;
                }

                // ---- 提取签到链接 ----
                var signUrl = extractSignUrl(html);

                if (signUrl) {
                    GM_log('[鱼C] 找到签到链接：' + signUrl);
                    executeSign(signUrl);
                } else {
                    GM_log('[鱼C] 未找到签到链接，尝试备用方案...');
                    GM_log('[鱼C] 页面片段：' + html.substring(0, 500));
                    fallbackSign(html);
                }
            },
            onerror: function () {
                handleError('访问签到页面失败（网络错误）');
            },
            ontimeout: function () {
                handleError('访问签到页面超时');
            }
        });
    }

    // ==================== 未登录检测 ====================
    function isNotLoggedIn(html) {
        if (html.length < 500 && html.includes('登录')) {
            return true;
        }
        if (html.includes('需要先登录') || html.includes('您需要登录')) {
            return true;
        }
        return false;
    }

    // ==================== 已签到检测 ====================
    function isAlreadySigned(html) {
        return /您的签到排名|已签到|今日已签|签到已得|已经签到|已连续签到/.test(html);
    }

    // ==================== 提取签到链接 ====================
    function extractSignUrl(html) {
        var m1 = html.match(/<a[^>]+id="JD_sign"[^>]+href="([^"]+)"/);
        if (m1) return resolveUrl(m1[1]);

        var m2 = html.match(/href="([^"]*k_misign[^"]*qiandao[^"]*)"/);
        if (m2) return resolveUrl(m2[1]);

        var m3 = html.match(/onclick="[^"]*window\.location=['"]([^'"]+)['"]/);
        if (m3 && m3[1].includes('sign')) return resolveUrl(m3[1]);

        var m4 = html.match(/href="([^"]*operation=qiandao[^"]*)"/);
        if (m4) return resolveUrl(m4[1]);

        var m5 = html.match(/href="([^"]*(?:sign|checkin)[^"]*(?:token|hash|key)[^"]*)"/i);
        if (m5) return resolveUrl(m5[1]);

        var m6 = html.match(/formhash=([a-f0-9]{8})/);
        if (m6) {
            return BASE_URL + '/plugin.php?id=k_misign:sign'
                + '&operation=qiandao'
                + '&formhash=' + m6[1];
        }

        return null;
    }

    // ==================== 处理相对URL ====================
    function resolveUrl(url) {
        if (!url) return null;
        if (url.startsWith('http')) return url;
        if (url.startsWith('//')) return 'https:' + url;
        if (url.startsWith('/')) return BASE_URL + url;
        return BASE_URL + '/' + url;
    }

    // ==================== 执行签到 ====================
    function executeSign(signUrl) {
        GM_log('[鱼C] 正在签到：' + signUrl);

        GM_xmlhttpRequest({
            method: 'GET',
            url: signUrl,
            headers: {
                'Referer': SIGN_PAGE,
                'Accept': 'text/html,application/xhtml+xml,*/*'
            },
            timeout: 15000,
            anonymous: false,
            onload: function (res) {
                var text = res.responseText || '';
                GM_log('[鱼C] 签到响应码：' + res.status);
                GM_log('[鱼C] 签到响应前300字：' + text.substring(0, 300));

                if (isSignSuccess(text)) {
                    GM_setValue('fishc_checkin', TODAY);
                    var reward = extractReward(text);
                    GM_notification({
                        title: '鱼C论坛：签到成功',
                        text: reward,
                        timeout: 5000
                    });
                    GM_log('[鱼C] ★ 签到成功：' + reward);
                    resolve('签到成功');
                } else if (isAlreadySigned(text)) {
                    GM_setValue('fishc_checkin', TODAY);
                    GM_notification({
                        title: '鱼C论坛：今日已签到',
                        text: '今天已经签到过了',
                        timeout: 5000
                    });
                    resolve('今日已签到');
                } else if (text.includes('需要先登录') || text.includes('未登录')) {
                    GM_notification({
                        title: '鱼C论坛：登录已失效',
                        text: '请重新登录鱼C论坛',
                        timeout: 8000,
                        onclick: function () {
                            GM_openInTab(BASE_URL);
                        }
                    });
                    reject('登录失效');
                } else {
                    GM_log('[鱼C] 未知签到结果');
                    handleError('签到返回未知内容');
                }
            },
            onerror: function () {
                handleError('签到请求网络错误');
            },
            ontimeout: function () {
                handleError('签到请求超时');
            }
        });
    }

    // ==================== 备用签到方案 ====================
    function fallbackSign(html) {
        if (/签到成功|操作成功|已签到/.test(html)) {
            GM_setValue('fishc_checkin', TODAY);
            GM_notification({
                title: '鱼C论坛：签到成功',
                text: '签到完成',
                timeout: 5000
            });
            resolve('签到成功');
            return;
        }

        handleError('无法提取签到链接');
    }

    // ==================== 签到成功判断 ====================
    function isSignSuccess(text) {
        return /签到成功|签到已得|今日已签|恭喜|操作成功|已连续签到/.test(text);
    }

    // ==================== 提取奖励信息 ====================
    function extractReward(text) {
        try {
            var json = JSON.parse(text);
            if (json.msg) return json.msg;
        } catch (e) {}

        var m;
        m = text.match(/签到已得[^\d]*(\d+)/);
        if (m) return '签到已得 ' + m[1] + ' 鱼币';

        m = text.match(/(\d+)\s*个?鱼币/);
        if (m) return '获得 ' + m[1] + ' 鱼币';

        m = text.match(/连续签到\s*(\d+)/);
        if (m) return '连续签到 ' + m[1] + ' 天';

        return '签到成功';
    }

    // ==================== 错误处理 ====================
    function handleError(msg) {
        retryCount++;
        GM_log('[鱼C] 错误：' + msg + ' | 重试 ' + retryCount + '/' + MAX_RETRY);

        if (retryCount < MAX_RETRY) {
            var delay = 5000 + Math.random() * 5000;
            setTimeout(performCheckin, delay);
        } else {
            GM_notification({
                title: '鱼C论坛：签到失败',
                text: '已重试 ' + MAX_RETRY + ' 次，原因：' + msg,
                timeout: 10000,
                onclick: function () {
                    GM_openInTab(SIGN_PAGE);
                }
            });
            reject('签到失败：' + msg);
        }
    }

    // ==================== 启动 ====================
    performCheckin();

});