// ==UserScript==
// @name         B站硬核会员答题辅助
// @namespace    http://tampermonkey.net/
// @description  硬核会员答题辅助
// @version      1.0
// @match        https://www.bilibili.com/h5/senior-newbie/qa
// @match        *://chat.deepseek.com/*
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_addValueChangeListener
// @run-at       document-end
// @downloadURL https://update.greasyfork.icu/scripts/574348/B%E7%AB%99%E7%A1%AC%E6%A0%B8%E4%BC%9A%E5%91%98%E7%AD%94%E9%A2%98%E8%BE%85%E5%8A%A9.user.js
// @updateURL https://update.greasyfork.icu/scripts/574348/B%E7%AB%99%E7%A1%AC%E6%A0%B8%E4%BC%9A%E5%91%98%E7%AD%94%E9%A2%98%E8%BE%85%E5%8A%A9.meta.js
// ==/UserScript==

(function () {
    'use strict';

    const IS_A = location.host.includes("bilibili.com");
    const IS_B = location.host.includes("deepseek.com");

    /***********************
     * 工具
     ***********************/
    const log = (tag, msg, data) => {
        console.log(`[${tag}] ${msg}`, data || "");
    };

    const sleep = (ms) => new Promise(r => setTimeout(r, ms));

    const makeKey = (t) => t.replace(/\s+/g, "").slice(0, 120);

    /***********************
     * A 页面
     ***********************/
    if (IS_A) {

        let lastKey = "";
        let lock = false;
        let pendingAnswer = null;

        const getBlock = () => {
            const blocks = document.querySelectorAll(".senior-question");
            return blocks[blocks.length - 1];
        };

        const extract = () => {
            const b = getBlock();
            if (!b) return null;

            const q = b.querySelector(".senior-question__qs");
            const a = b.querySelectorAll(".senior-question__answer");

            if (!q || !a.length) return null;

            let text = q.innerText.trim() + " ";
            a.forEach(i => text += i.innerText.trim() + " ");
            return text;
        };

        const clickAnswer = (letter) => {

            const b = getBlock();
            const items = b.querySelectorAll(".senior-question__answer");

            for (let el of items) {
                if (el.innerText.trim().startsWith(letter)) {
                    el.click();
                    log("A6", "点击完成", letter);
                    return true;
                }
            }

            return false;
        };

        /***********************
         * S5：接收答案
         ***********************/
        GM_addValueChangeListener("answer", async (n, o, v, remote) => {
            if (!remote || !v) return;

            log("A5", "收到B答案", v);

            pendingAnswer = v;

            await sleep(100);

            if (!lock) {
                log("A5", "锁状态异常，跳过点击");
                return;
            }

            const ok = clickAnswer(pendingAnswer);

            if (ok) {
                pendingAnswer = null;

                log("A6", "点击成功，等待下一题");

                await sleep(500);

                lock = false;
            } else {
                log("A6", "点击失败，未找到选项");
            }
        });

        /***********************
         * S1-S2：发送题目
         ***********************/
        const sendTask = (q) => {

            const key = makeKey(q);

            if (key === lastKey) return;

            lastKey = key;
            lock = true;

            log("A1", "抓取题目", q);
            log("A2", "发送题目", key);

            GM_setValue("task", {
                id: Date.now(),
                key,
                text: q
            });
        };

        const observer = new MutationObserver(() => {

            const q = extract();
            if (!q) return;

            const key = makeKey(q);

            if (key !== lastKey && !lock) {
                sendTask(q);
            }
        });

        observer.observe(document.body, {
            childList: true,
            subtree: true,
            characterData: true
        });
    }

    /***********************
     * B 页面
     ***********************/
    if (IS_B) {

        let lastTask = 0;

        const setVal = (el, val) => {
            const setter = Object.getOwnPropertyDescriptor(
                HTMLTextAreaElement.prototype,
                "value"
            ).set;

            setter.call(el, val);
            el.dispatchEvent(new Event("input", { bubbles: true }));
        };

        const sendEnter = (el) => {
            el.dispatchEvent(new KeyboardEvent("keydown", {
                bubbles: true,
                key: "Enter",
                code: "Enter",
                keyCode: 13,
                which: 13
            }));
        };

        /***********************
         * S3：接收题目
         ***********************/
        GM_addValueChangeListener("task", (n, o, task, remote) => {
            if (!remote || !task) return;
            if (task.id === lastTask) return;

            lastTask = task.id;

            log("B3", "收到题目", task.key);

            setTimeout(() => {

                const input = document.querySelector("textarea");
                if (!input) {
                    log("B3", "输入框不存在");
                    return;
                }

                log("B4", "开始输入");

                setVal(input, task.text + " 只回答A/B/C/D");

                setTimeout(() => {

                    log("B4", "发送到AI");
                    sendEnter(input);

                }, 500);

            }, 800);
        });

        /***********************
         * S4：监听AI输出
         ***********************/
        setInterval(() => {

            const msgs = document.querySelectorAll(".ds-markdown-paragraph");
            if (!msgs.length) return;

            const last = msgs[msgs.length - 1].innerText.trim();

            const m = last.match(/\b([A-D])\b/);

            if (m) {
                log("B4", "AI输出答案", m[1]);
                GM_setValue("answer", m[1]);
            }

        }, 400);
    }

})();