// 聊天消息渲染引擎：构建消息内容、追加消息、批量渲染与裁剪。
// 从 Blade 内联脚本 scripts.blade.php 迁移至 Vite 模块。

import { escapeHtml, normalizeSafeChatUrl } from "./html.js";
import {
    attachIdiomAnswerButton,
    buildQuizActivityTitle,
    disableIdiomAnswerButtons,
    isQuizStartMessage,
    normalizeQuizRoundPayload,
} from "./riddle-quiz.js";
import { isExpiredChatImageMessage } from "./message-utils.js";
import { normalizeDailyStatus, resolveBlockedSystemSenderKey } from "./preferences-status.js";
import { escapePresenceText } from "./vip-presence.js";
import {
    BLOCKABLE_SYSTEM_SENDERS,
    PUBLIC_MESSAGE_NODE_LIMIT,
    PRIVATE_MESSAGE_NODE_LIMIT,
    CHAT_MESSAGE_FLUSH_BATCH_SIZE,
    SYSTEM_USERS,
    ACTION_TEXT_MAP,
} from "./chat-state.js";

// ── 游戏标签判断 ──
const GAME_LABEL_PREFIXES = ["五子棋", "双色球", "钓鱼", "老虎机", "百家乐", "赛马"];
const CHAT_NOTICE_CHIP_FONT_SIZE = "0.82em";
const CHAT_NOTICE_META_FONT_SIZE = "0.72em";
const CHAT_NOTICE_BUTTON_FONT_SIZE = "0.82em";
const CHAT_NOTICE_BODY_FONT_SIZE = "1em";
const CHAT_NOTICE_ICON_FONT_SIZE = "1.08em";
const CHAT_NOTICE_LARGE_ICON_FONT_SIZE = "1.35em";
const CHAT_NOTICE_DECOR_ICON_FONT_SIZE = "4.25em";

function isGameLabel(name) {
    if (GAME_LABEL_PREFIXES.some((p) => name.startsWith(p))) return true;
    if (name.includes(" ")) return true;
    return false;
}

// ── 构建自然语序的动作串 ──
function buildActionStr(action, fromHtml, toHtml, verb = "说") {
    const info = ACTION_TEXT_MAP[action];
    if (!info) return `${fromHtml}对${toHtml}${escapeHtml(String(action || ""))}${verb}：`;
    if (info.type === "emotion") return `${fromHtml}${info.word}对${toHtml}${verb}：`;
    return `${fromHtml}${info.word}${toHtml}，${verb}：`;
}

// ── 可点击用户名 ──
function clickableUser(uName, color, extraClass = "") {
    const safeName = escapeHtml(uName);
    if (uName === "AI小班长") {
        return `<span class="msg-user${extraClass}" data-chat-message-user data-u="${safeName}" style="color: ${color}; cursor: pointer;">${safeName}</span>`;
    }
    if (SYSTEM_USERS.includes(uName) || isGameLabel(uName)) {
        return `<span class="msg-user${extraClass}" style="color: ${color};">${safeName}</span>`;
    }
    return `<span class="msg-user${extraClass}" data-chat-message-user data-u="${safeName}" style="color: ${color}; cursor: pointer;">${safeName}</span>`;
}

// ── 解析内容中【用户名】为可点击标记 ──
function parseBracketUsers(content, color = "#000099") {
    return content.replace(/【([^】]+)】/g, (_match, uName) => {
        return "【" + clickableUser(uName, color) + "】";
    });
}

/**
 * 构建统一的猜谜活动标题与题型标签。
 */
function buildGameLabelChipHtml(label, accentColor) {
    return `<span style="display:inline-flex;align-items:center;padding:2px 9px;border-radius:999px;background:${accentColor};color:#fff;font-size:${CHAT_NOTICE_CHIP_FONT_SIZE};font-weight:700;line-height:1;border:1px solid ${accentColor};">${escapeHtml(label)}</span>`;
}

/**
 * 判断当前是否为礼包发放公告。
 */
function isRedPacketAnnouncementMessage(msg) {
    const content = String(msg?.content || "");

    return String(msg?.from_user || "") === "系统公告"
        && content.includes("发出了一个")
        && content.includes("礼包")
        && content.includes("立即抢包");
}

/**
 * 构建礼包发放公告的紧凑卡片，整体比例对齐猜谜活动。
 */
function buildRedPacketAnnouncementHtml(msg, timeStr) {
    const rawContent = String(msg?.content || "");
    const isExpPacket = rawContent.includes("经验的礼包");
    const colorPalette = isExpPacket
        ? {
              accent: "#16a34a",
              text: "#166534",
              softBackground: "linear-gradient(135deg,#f0fdf4,#f7fee7)",
              softBorder: "rgba(22,163,74,.18)",
              chipBackground: "#dcfce7",
              chipBorder: "#86efac",
              chipText: "#15803d",
          }
        : {
              accent: "#dc2626",
              text: "#b91c1c",
              softBackground: "linear-gradient(135deg,#fef2f2,#fff7ed)",
              softBorder: "rgba(220,38,38,.18)",
              chipBackground: "#fee2e2",
              chipBorder: "#fca5a5",
              chipText: "#dc2626",
          };
    const accentColor = colorPalette.accent;
    const typeLabel = isExpPacket ? "经验礼包" : "金币礼包";
    const icon = isExpPacket ? "✨" : "🧧";
    const buttonMatch = rawContent.match(/<button\b([^>]*)>([\s\S]*?)<\/button>/iu);
    const buttonLabel = String(buttonMatch?.[2] || "立即抢包").trim();
    const onclickMatch = String(buttonMatch?.[1] || "").match(/\bonclick=(["'])([\s\S]*?)\1/iu);
    const buttonOnclick = onclickMatch ? onclickMatch[2] : "";

    const textOnlyContent = rawContent
        .replace(/<button\b[\s\S]*?<\/button>/giu, "")
        .replace(/<\/?b>/giu, "")
        .replace(/^🧧\s*/u, "")
        .trim();

    const summary = escapeHtml(textOnlyContent);
    const actionButtonHtml = `<button type="button"${buttonOnclick ? ` onclick="${escapeHtml(buttonOnclick)}"` : ""} style="display:inline-flex;align-items:center;padding:2px 9px;border-radius:999px;background:${accentColor};color:#fff;font-size:${CHAT_NOTICE_BUTTON_FONT_SIZE};font-weight:700;line-height:1;border:1px solid ${accentColor};cursor:pointer;box-shadow:none;vertical-align:middle;">${escapeHtml(buttonLabel)}</button>`;

    return `
        <div style="display:flex;align-items:center;gap:7px;padding:5px 9px;border-radius:11px;background:${colorPalette.softBackground};border:1px solid ${colorPalette.softBorder};box-shadow:0 4px 12px rgba(15,23,42,.045);overflow:hidden;">
            <div style="width:23px;height:23px;border-radius:7px;background:${accentColor};display:flex;align-items:center;justify-content:center;color:#fff;font-size:${CHAT_NOTICE_ICON_FONT_SIZE};box-shadow:0 2px 6px ${colorPalette.softBorder};flex-shrink:0;">${icon}</div>
            <div style="min-width:0;flex:1;display:flex;align-items:center;gap:7px;flex-wrap:wrap;color:${colorPalette.text};">
                <div style="display:flex;align-items:center;gap:6px;flex-wrap:wrap;flex-shrink:0;">
                    ${buildGameLabelChipHtml("礼包红包", accentColor)}
                    <span style="display:inline-flex;align-items:center;padding:2px 9px;border-radius:999px;background:${colorPalette.chipBackground};color:${colorPalette.chipText};font-size:${CHAT_NOTICE_CHIP_FONT_SIZE};font-weight:700;line-height:1;border:1px solid ${colorPalette.chipBorder};">${escapeHtml(typeLabel)}</span>
                </div>
                <div style="display:flex;align-items:center;gap:5px;flex-wrap:wrap;font-size:${CHAT_NOTICE_BODY_FONT_SIZE};line-height:1.25;font-weight:700;min-width:200px;flex:1;">
                    <span>${summary}</span>
                    <span class="msg-time" style="font-size:${CHAT_NOTICE_META_FONT_SIZE};color:#94a3b8;">(${timeStr})</span>
                    ${actionButtonHtml}
                </div>
            </div>
        </div>
    `;
}

/**
 * 构建统一的猜谜活动标题与题型标签。
 */
function buildQuizBadgeHtml(msg, accentColor = "#7c3aed") {
    const { activityLabel, typeLabel } = buildQuizActivityTitle(msg);

    return `
        <span style="display:inline-flex;align-items:center;gap:6px;flex-wrap:wrap;">
            ${buildGameLabelChipHtml(activityLabel, accentColor)}
            <span style="display:inline-flex;align-items:center;padding:2px 9px;border-radius:999px;background:${accentColor}1A;color:${accentColor};font-size:${CHAT_NOTICE_CHIP_FONT_SIZE};font-weight:700;line-height:1;border:1px solid ${accentColor}33;">${escapeHtml(typeLabel)}</span>
        </span>
    `;
}

/**
 * 判断当前公屏消息是否属于“我自己”的钓鱼结果广播。
 *
 * 说明：
 * - 收竿后，钓鱼者本人已经会在包厢窗口收到本地结果提示；
 * - 这里需要把同一条公屏广播对本人隐藏，避免自己同时看到两条。
 */
function isOwnFishingResultBroadcast(msg) {
    const currentUsername = String(window.chatContext?.username || "").trim();
    const fishingUsername = String(msg?.fishing_username || "").trim();

    if (!currentUsername) {
        return false;
    }

    return String(msg?.from_user || "") === "钓鱼播报"
        && String(msg?.action || "") === "fishing_result"
        && fishingUsername === currentUsername;
}

/**
 * 判断当前消息是否应该使用统一的游戏通知卡片。
 */
function resolveGameNotificationCardMeta(msg) {
    const normalizedContent = String(msg?.content || "");
    const fromUser = String(msg?.from_user || "");

    if (
        normalizedContent.includes("【百家乐】")
        || (normalizedContent.includes("开局：") && normalizedContent.includes("点收割"))
        || (normalizedContent.startsWith("🎲") && normalizedContent.includes("点"))
        || (normalizedContent.includes("快速参与") && normalizedContent.includes("1:24"))
    ) {
        return {
            label: "百家乐",
            icon: "🎲",
            accent: "#2563eb",
            background: "linear-gradient(135deg,#eff6ff,#f8fbff)",
            border: "rgba(37,99,235,.16)",
            text: "#1e3a8a",
            chipBg: "#dbeafe",
        };
    }

    if (
        normalizedContent.includes("【赛马】")
        || normalizedContent.startsWith("🐎 开赛：")
        || normalizedContent.startsWith("🏇 比赛开始：")
        || normalizedContent.startsWith("🏆 冠军：")
        || /^🐎\s*第\s*#?\d+\s*场开赛/u.test(normalizedContent)
        || /^🏇\s*第\s*#?\d+\s*场比赛开始/u.test(normalizedContent)
        || /^🏆\s*第\s*#?\d+\s*场结束/u.test(normalizedContent)
    ) {
        return {
            label: "赛马",
            icon: "🏇",
            accent: "#0f766e",
            background: "linear-gradient(135deg,#ecfeff,#f0fdfa)",
            border: "rgba(15,118,110,.16)",
            text: "#115e59",
            chipBg: "#ccfbf1",
        };
    }

    if (
        normalizedContent.includes("神秘箱子")
        || (normalizedContent.includes("暗号") && normalizedContent.includes("《"))
        || normalizedContent.includes("抢到")
        || normalizedContent.includes("箱子消失")
    ) {
        return {
            label: "神秘箱子",
            icon: "📦",
            accent: "#7c3aed",
            background: "linear-gradient(135deg,#faf5ff,#fdf4ff)",
            border: "rgba(124,58,237,.16)",
            text: "#6b21a8",
            chipBg: "#ede9fe",
        };
    }

    if (
        normalizedContent.includes("双色球")
        || /购买\s+\d+\s*期/u.test(normalizedContent)
        || /\d+\s*期：\s*🔴/u.test(normalizedContent)
        || normalizedContent.includes("超级期")
    ) {
        return {
            label: "双色球彩票",
            icon: "🎟️",
            accent: "#dc2626",
            background: "linear-gradient(135deg,#fef2f2,#fff7ed)",
            border: "rgba(220,38,38,.16)",
            text: "#991b1b",
            chipBg: "#fee2e2",
        };
    }

    if (normalizedContent.includes("【五子棋】")) {
        return {
            label: "五子棋",
            icon: "♟️",
            accent: "#475569",
            background: "linear-gradient(135deg,#f8fafc,#f1f5f9)",
            border: "rgba(71,85,105,.16)",
            text: "#334155",
            chipBg: "#e2e8f0",
        };
    }

    if (normalizedContent.includes("老虎机")) {
        return {
            label: "老虎机",
            icon: "🎰",
            accent: "#d97706",
            background: "linear-gradient(135deg,#fff7ed,#fffbeb)",
            border: "rgba(217,119,6,.16)",
            text: "#9a3412",
            chipBg: "#fed7aa",
        };
    }

    if (fromUser === "钓鱼播报") {
        return {
            label: "钓鱼",
            icon: "🎣",
            accent: "#059669",
            background: "linear-gradient(135deg,#ecfdf5,#f0fdf4)",
            border: "rgba(5,150,105,.16)",
            text: "#065f46",
            chipBg: "#a7f3d0",
        };
    }

    return null;
}

/**
 * 提炼系统传音卡片正文，去掉和标签重复的前缀。
 */
function extractSystemGameCardSummary(content, meta) {
    const normalizedContent = String(content || "").trim();

    if (!meta) {
        return normalizedContent;
    }

    if (meta.label === "神秘箱子") {
        return normalizedContent
            .replace(/^[📦💎☠️]\s*/u, "")
            .replace(/^【神秘箱子】/u, "")
            .replace(/^开箱播报[:：]\s*/u, "")
            .trim();
    }

    if (meta.label === "百家乐") {
        if (normalizedContent.includes("开局：")) {
            return normalizedContent
                .replace(/^[🎲]+\s*/u, "")
                .replace(/【百家乐】/u, "")
                .replace(/\s+/gu, " ")
                .trim();
        }

        if (/第\s*#?\d+\s*局开奖/u.test(normalizedContent)) {
            return normalizedContent
                .replace(/^[🎲🎉]+\s*/u, "")
                .replace(/^【百家乐】/u, "")
                .replace(/\s+/gu, " ")
                .trim();
        }

        return normalizedContent
            .replace(/^[🎲🎉]+\s*/u, "")
            .replace(/^【百家乐】/u, "")
            .replace(/\s+/gu, " ")
            .trim();
    }

    if (meta.label === "赛马") {
        return normalizedContent
            .replace(/^[🐎🏇🏆]+\s*/u, "")
            .replace(/^【赛马】/u, "")
            .trim();
    }

    if (meta.label === "双色球彩票") {
        return normalizedContent
            .replace(/^[🎟️🎊]+\s*/u, "")
            .replace(/^【双色球[^】]*】/u, "")
            .trim();
    }

    if (meta.label === "五子棋") {
        return normalizedContent
            .replace(/^[♟️🏆]+\s*/u, "")
            .replace(/^【五子棋】/u, "")
            .replace(/^玩家对战结果！/u, "对战结果：")
            .replace(/^棋神降临！/u, "人机获胜：")
            .replace(/^AI 大获全胜！/u, "AI获胜：")
            .trim();
    }

    if (meta.label === "老虎机") {
        return normalizedContent
            .replace(/^[🎰🎉]+\s*/u, "")
            .replace(/^【老虎机大奖】/u, "大奖：")
            .trim();
    }

    return normalizedContent;
}

/**
 * 统一系统游戏卡片中的内嵌按钮样式，避免不同游戏沿用旧尺寸。
 */
function normalizeSystemGameCardActions(content, meta) {
    const normalizedContent = String(content || "");

    return normalizedContent.replace(/<button\b([^>]*)>([\s\S]*?)<\/button>/giu, (_match, attributes, label) => {
        const onclickMatch = String(attributes || "").match(/\bonclick=(["'])([\s\S]*?)\1/iu);
        const onclickAttr = onclickMatch ? ` onclick="${escapeHtml(onclickMatch[2])}"` : "";
        const safeLabel = String(label || "").trim();

        return `<button type="button"${onclickAttr} style="display:inline-flex;align-items:center;padding:2px 9px;border-radius:999px;background:#fff;color:${meta.accent};font-size:${CHAT_NOTICE_BUTTON_FONT_SIZE};font-weight:700;line-height:1;border:1px solid ${meta.accent};cursor:pointer;box-shadow:none;vertical-align:middle;">${safeLabel}</button>`;
    });
}

/**
 * 将系统传音中的游戏通知渲染为和猜谜活动同级的紧凑卡片。
 */
function buildSystemGameNotificationHtml(msg, timeStr) {
    const content = String(msg.content || "");
    const meta = resolveGameNotificationCardMeta(msg);
    if (!meta) {
        return "";
    }

    const summary = normalizeSystemGameCardActions(extractSystemGameCardSummary(content, meta), meta);

    return `
        <div style="display:flex;align-items:center;gap:7px;padding:5px 9px;border-radius:11px;background:${meta.background};border:1px solid ${meta.border};box-shadow:0 4px 12px rgba(15,23,42,.045);overflow:hidden;">
            <div style="width:23px;height:23px;border-radius:7px;background:${meta.accent};display:flex;align-items:center;justify-content:center;color:#fff;font-size:${CHAT_NOTICE_ICON_FONT_SIZE};box-shadow:0 2px 6px ${meta.border};flex-shrink:0;">${meta.icon}</div>
            <div style="min-width:0;flex:1;display:flex;align-items:center;gap:7px;flex-wrap:wrap;color:${meta.text};">
                ${buildGameLabelChipHtml(meta.label, meta.accent)}
                <div style="display:flex;align-items:center;gap:5px;flex-wrap:wrap;font-size:${CHAT_NOTICE_BODY_FONT_SIZE};line-height:1.25;font-weight:700;min-width:200px;flex:1;">
                    <span>${parseBracketUsers(summary, meta.text)}</span>
                    <span class="msg-time" style="font-size:${CHAT_NOTICE_META_FONT_SIZE};color:#94a3b8;font-weight:600;">(${timeStr})</span>
                </div>
            </div>
        </div>
    `;
}

/**
 * 猜谜活动开题消息统一渲染为卡片。
 */
function buildQuizStartHtml(msg, timeStr) {
    const quizMeta = normalizeQuizRoundPayload(msg);
    const rawHint = String(quizMeta.hint || msg.content || "")
        .replace(/^🧩\s*/, "")
        .replace(/^📣\s*/, "")
        .replace(/^【[^】]+】\s*第\s*#?\d+\s*题开始！?\s*题面：\s*/u, "")
        .replace(/^【[^】]+】\s*/u, "")
        .replace(/^第\s*#?\d+\s*题开始！?\s*题面：\s*/u, "")
        .replace(/^题面：\s*/u, "")
        .trim();
    const safeHint = escapeHtml(rawHint);

    return `
        <div style="display:flex;align-items:center;gap:7px;padding:5px 9px;border-radius:11px;background:linear-gradient(135deg,#f5f3ff,#faf5ff);border:1px solid rgba(124,58,237,.16);box-shadow:0 4px 12px rgba(124,58,237,.07);overflow:hidden;">
            <div style="width:23px;height:23px;border-radius:7px;background:linear-gradient(135deg,#7c3aed,#a78bfa);display:flex;align-items:center;justify-content:center;color:#fff;font-size:${CHAT_NOTICE_ICON_FONT_SIZE};box-shadow:0 2px 6px rgba(124,58,237,.16);flex-shrink:0;">🧩</div>
            <div style="min-width:0;flex:1;display:flex;align-items:center;gap:7px;flex-wrap:wrap;color:#312e81;">
                <div style="display:flex;align-items:center;gap:7px;flex-wrap:wrap;flex-shrink:0;">${buildQuizBadgeHtml(msg)}</div>
                <div data-quiz-inline-text style="display:flex;align-items:center;gap:5px;flex-wrap:wrap;font-size:${CHAT_NOTICE_BODY_FONT_SIZE};line-height:1.25;font-weight:700;min-width:200px;flex:1;">
                    <span>${safeHint}</span>
                    <span class="msg-time" style="font-size:${CHAT_NOTICE_META_FONT_SIZE};color:#94a3b8;">(${timeStr})</span>
                    <span data-quiz-inline-action-anchor></span>
                </div>
                <div style="display:flex;align-items:center;gap:5px;flex-wrap:wrap;color:#6d28d9;font-size:${CHAT_NOTICE_META_FONT_SIZE};flex-shrink:0;margin-left:auto;">
                    <span style="padding:1px 6px;border-radius:999px;background:#ffffff;box-shadow:inset 0 0 0 1px rgba(124,58,237,.10);white-space:nowrap;">💰 ${quizMeta.rewardGold} 金币</span>
                    <span style="padding:1px 6px;border-radius:999px;background:#ffffff;box-shadow:inset 0 0 0 1px rgba(124,58,237,.10);white-space:nowrap;">⭐ ${quizMeta.rewardExp} 经验</span>
                </div>
            </div>
        </div>
    `;
}

/**
 * 提取猜谜活动结束消息里的正确答案，兼容中奖与超时文案。
 */
function resolveQuizResultAnswerText(msg) {
    const quizMeta = normalizeQuizRoundPayload(msg);
    const explicitAnswer = String(quizMeta.answer || "").trim();
    if (explicitAnswer) {
        return explicitAnswer;
    }

    const content = String(msg.content || "");
    const matchedAnswer = content.match(/正确答案：(.+?)(?:！|。|$)/u);

    return matchedAnswer?.[1]?.trim() || content.trim();
}

/**
 * 猜谜活动结束消息统一渲染为和开题通知同级的紧凑卡片。
 */
function buildQuizResultHtml(msg, timeStr) {
    const quizMeta = normalizeQuizRoundPayload(msg);
    const winnerUsername = String(msg.winner_username || "").trim();
    const answerText = escapeHtml(resolveQuizResultAnswerText(msg));
    const isAnsweredResult = winnerUsername !== "";
    const accentColor = isAnsweredResult ? "#7c3aed" : "#d97706";
    const accentBackground = isAnsweredResult
        ? "linear-gradient(135deg,#f5f3ff,#faf5ff)"
        : "linear-gradient(135deg,#fff7ed,#fffbeb)";
    const accentBorder = isAnsweredResult ? "rgba(124,58,237,.16)" : "rgba(217,119,6,.18)";
    const textColor = isAnsweredResult ? "#312e81" : "#9a3412";
    const icon = isAnsweredResult ? "🎉" : "⏳";
    const iconBackground = isAnsweredResult
        ? "linear-gradient(135deg,#7c3aed,#a78bfa)"
        : "linear-gradient(135deg,#f59e0b,#f97316)";
    const badgeColor = isAnsweredResult ? "#7c3aed" : "#d97706";
    const summaryHtml = isAnsweredResult
        ? `【${clickableUser(winnerUsername, "#6d28d9")}】率先答对「${answerText}」`
        : `第 #${quizMeta.endedRoundId || quizMeta.roundId || 0} 题已超时结束，正确答案：${answerText}`;

    return `
        <div style="display:flex;align-items:center;gap:7px;padding:5px 9px;border-radius:11px;background:${accentBackground};border:1px solid ${accentBorder};box-shadow:0 4px 12px rgba(15,23,42,.045);overflow:hidden;">
            <div style="width:23px;height:23px;border-radius:7px;background:${iconBackground};display:flex;align-items:center;justify-content:center;color:#fff;font-size:${CHAT_NOTICE_ICON_FONT_SIZE};box-shadow:0 2px 6px ${accentBorder};flex-shrink:0;">${icon}</div>
            <div style="min-width:0;flex:1;display:flex;align-items:center;gap:7px;flex-wrap:wrap;color:${textColor};">
                <div style="display:flex;align-items:center;gap:7px;flex-wrap:wrap;flex-shrink:0;">${buildQuizBadgeHtml(msg, badgeColor)}</div>
                <div style="display:flex;align-items:center;gap:5px;flex-wrap:wrap;font-size:${CHAT_NOTICE_BODY_FONT_SIZE};line-height:1.25;font-weight:700;min-width:200px;flex:1;">
                    <span>${summaryHtml}</span>
                    <span class="msg-time" style="font-size:${CHAT_NOTICE_META_FONT_SIZE};color:#94a3b8;">(${timeStr})</span>
                </div>
                ${isAnsweredResult ? `
                    <div style="display:flex;align-items:center;gap:5px;flex-wrap:wrap;color:${textColor};font-size:${CHAT_NOTICE_META_FONT_SIZE};flex-shrink:0;margin-left:auto;">
                        <span style="padding:1px 6px;border-radius:999px;background:#ffffff;box-shadow:inset 0 0 0 1px ${isAnsweredResult ? "rgba(124,58,237,.10)" : "rgba(217,119,6,.12)"};white-space:nowrap;">💰 ${quizMeta.rewardGold} 金币</span>
                        <span style="padding:1px 6px;border-radius:999px;background:#ffffff;box-shadow:inset 0 0 0 1px ${isAnsweredResult ? "rgba(124,58,237,.10)" : "rgba(217,119,6,.12)"};white-space:nowrap;">⭐ ${quizMeta.rewardExp} 经验</span>
                    </div>
                ` : ""}
            </div>
        </div>
    `;
}

/**
 * 只保留包厢窗口最近几条猜成语答题记录，避免答题历史无限堆积。
 */
function prunePrivateIdiomResultMessages(targetContainer, maxRecords = 3) {
    if (!targetContainer) {
        return;
    }

    const nodes = Array.from(targetContainer.querySelectorAll('[data-idiom-result="1"]'));
    while (nodes.length > maxRecords) {
        const firstNode = nodes.shift();
        firstNode?.remove();
    }
}

/**
 * 构建聊天消息的内容 HTML。
 */
export function buildChatMessageContent(msg, fontColor, textColorClass) {
    const rawContent = msg.content || "";

    if (msg.message_type === "image" && !isExpiredChatImageMessage(msg)) {
        const fullUrl = escapeHtml(msg.image_url || "");
        const thumbUrl = escapeHtml(msg.image_thumb_url || "");
        const imageName = escapeHtml(msg.image_original_name || "聊天图片");
        const captionColorStyle = textColorClass ? "" : `color:${fontColor};`;
        const captionHtml = rawContent
            ? `<span class="msg-content${textColorClass || ""}" style="display:inline-block; max-width:220px; ${captionColorStyle} line-height:1.55;">${rawContent}</span>`
            : "";

        return `
            <span style="display:inline-flex; align-items:flex-start; gap:6px; vertical-align:middle;">
                <a href="${fullUrl}" data-full="${fullUrl}" data-alt="${imageName}" data-chat-image-lightbox-open
                    style="display:inline-block; border:1px solid rgba(15,23,42,.14); border-radius:10px; overflow:hidden; background:#f8fafc; box-shadow:0 2px 10px rgba(15,23,42,.10);">
                    <img src="${thumbUrl}" alt="${imageName}" loading="lazy" decoding="async"
                        style="display:block; max-width:96px; max-height:96px; object-fit:cover; cursor:zoom-in;">
                </a>
                ${captionHtml}
            </span>
        `;
    }

    if (msg.message_type === "expired_image" || isExpiredChatImageMessage(msg)) {
        const captionColorStyle = textColorClass ? "" : `color:${fontColor};`;
        const captionHtml = rawContent
            ? `<span class="msg-content${textColorClass || ""}" style="display:inline-block; ${captionColorStyle} line-height:1.55;">${rawContent}</span>`
            : "";

        return `
            <span style="display:inline-flex; align-items:center; gap:6px; vertical-align:middle;">
                <span style="display:inline-flex; align-items:center; padding:4px 8px; border:1px dashed #94a3b8; border-radius:999px; background:#f8fafc; color:#64748b; font-size:${CHAT_NOTICE_BUTTON_FONT_SIZE};">🖼️ 图片已过期</span>
                ${captionHtml}
            </span>
        `;
    }

    return rawContent;
}

/**
 * 追加消息到聊天窗格（原版风格：非气泡模式，逐行显示）。
 *
 * @param {Object} msg 消息对象
 * @param {Object|null} renderBatch 批量渲染上下文
 */
export function appendMessage(msg, renderBatch = null) {
    const state = window.chatState;
    if (!state) return;

    state.trackMaxMsgId(msg.id || 0);

    if (isOwnFishingResultBroadcast(msg)) {
        return null;
    }

    const quizMeta = normalizeQuizRoundPayload(msg);
    const idiomRoundId = quizMeta.roundId;
    const isIdiomStartMessage = isQuizStartMessage(msg)
        && ["星海小博士", "系统传音"].includes(String(msg.from_user || ""));

    if (isIdiomStartMessage) {
        const existingIdiomNode = document.querySelector(`[data-idiom-round-id="${idiomRoundId}"]`);
        if (existingIdiomNode) {
            attachIdiomAnswerButton(existingIdiomNode, msg);
            return existingIdiomNode;
        }
    }

    const isMe = msg.from_user === window.chatContext?.username;
    // 系统播报屏蔽只作用于公屏窗口；自己相关消息仍要进入包厢窗口，避免屏蔽误伤个人提示。
    const isIdiomWinnerHistory = msg.action === "idiom_result" && msg.winner_username === window.chatContext?.username;
    const isRelatedToMe = isMe || msg.is_secret || msg.to_user === window.chatContext?.username || isIdiomWinnerHistory;
    const fontColor = msg.font_color || "#000000";
    const blockRuleKey = resolveBlockedSystemSenderKey(msg);
    const shouldApplyBlockRule = Boolean(blockRuleKey && !isRelatedToMe);
    const shouldHideByBlock = shouldApplyBlockRule ? state.blockedSystemSenders.has(blockRuleKey) : false;

    const div = document.createElement("div");
    div.className = "msg-line";
    if (msg?.from_user) {
        div.dataset.fromUser = msg.from_user;
    }
    if (idiomRoundId > 0) {
        div.dataset.idiomRoundId = String(idiomRoundId);
        div.dataset.quizRoundId = String(idiomRoundId);
    }
    if (shouldApplyBlockRule) {
        div.dataset.blockKey = blockRuleKey;
    }

    // ── 消息气泡装扮 ──
    if (msg.msg_bubble) {
        const bubbleStyle = msg.msg_bubble.replace(/^msg_bubble_/, "");
        div.classList.add("msg-bubble--" + bubbleStyle);
    }

    const timeStr = msg.sent_at || "";
    let timeStrOverride = false;

    let nameClass = "";
    if (msg.msg_name_color) {
        nameClass = " msg-name--" + msg.msg_name_color.replace(/^msg_name_/, "");
    }

    let textColorClass = "";
    if (msg.msg_text_color) {
        textColorClass = " msg-text--" + msg.msg_text_color.replace(/^msg_text_/, "");
    }

    // 用户头像
    const senderInfo = state.onlineUsers[msg.from_user];
    const senderHead = (senderInfo && senderInfo.headface) || "1.gif";
    let headImgSrc = senderHead.startsWith("storage/") ? "/" + senderHead : `/images/headface/${senderHead}`;
    if (msg.from_user.endsWith("播报") || msg.from_user === "星海小博士" || msg.from_user === "系统传音" || msg.from_user === "系统公告") {
        headImgSrc = "/images/bugle.png";
    }

    // ── 头像框装扮 ──
    let avatarFrameClass = null;
    const avatarFrameRaw = msg.avatar_frame || (senderInfo && senderInfo.avatar_frame);
    if (avatarFrameRaw) {
        avatarFrameClass = "avatar-frame--" + avatarFrameRaw.replace(/^avatar_frame_/, "");
    }

    let headImg = "";
    if (avatarFrameClass) {
        headImg = '<span class="avatar-frame-wrapper-sm">' +
            '<span class="avatar-frame ' + avatarFrameClass + '"></span>' +
            '<img src="' + headImgSrc + '" onerror="this.src=\'/images/headface/1.gif\'">' +
            '</span>';
    } else {
        headImg = '<img src="' + headImgSrc + '" style="display:inline;width:16px;height:16px;vertical-align:middle;margin-right:2px;mix-blend-mode: multiply;" onerror="this.src=\'/images/headface/1.gif\'">';
    }

    const messageBodyHtml = buildChatMessageContent(msg, fontColor, textColorClass);
    let html = "";

    // ── 消息路由 ──
    if (msg.action === "system_welcome") {
        div.style.cssText = "margin: 3px 0;";
        const iconImg = `<img src="/images/bugle.png" style="display:inline;width:16px;height:16px;vertical-align:middle;margin-right:2px;mix-blend-mode: multiply;" onerror="this.src='/images/headface/1.gif'">`;
        const parsedContent = parseBracketUsers(msg.content);
        html = `${iconImg} ${parsedContent}`;
    } else if (msg.action === "idiom_result") {
        div.dataset.idiomResult = "1";
        div.dataset.quizRoundEndedId = String(quizMeta.endedRoundId || quizMeta.roundId || 0);
        div.dataset.quizWinnerUsername = String(msg.winner_username || "");
        html = buildQuizResultHtml(msg, timeStr);
        timeStrOverride = true;
    } else if (isIdiomStartMessage) {
        html = buildQuizStartHtml(msg, timeStr);
        timeStrOverride = true;
    } else if (msg.action === "vip_presence") {
        const accent = msg.presence_color || "#f59e0b";
        div.style.cssText =
            `background: linear-gradient(135deg, #ffffff, ${accent}08); border: 2px solid ${accent}44; border-radius: 16px; padding: 12px 16px; margin: 8px 0; box-shadow: 0 4px 15px ${accent}15; position: relative; overflow: hidden;`;

        const icon = escapeHtml(msg.presence_icon || "👑");
        const levelName = escapeHtml(msg.presence_level_name || "尊贵会员");
        const typeLabel = msg.presence_type === "leave"
            ? "华丽离场"
            : (msg.presence_type === "purchase" ? "荣耀开通" : "荣耀入场");
        const safeText = escapePresenceText(msg.presence_text || "");

        html = `
            <div style="display:flex;align-items:center;gap:12px;">
                <div style="width:48px;height:48px;border-radius:14px;background:linear-gradient(135deg, ${accent}, #fbbf24);display:flex;align-items:center;justify-content:center;font-size:${CHAT_NOTICE_LARGE_ICON_FONT_SIZE};box-shadow: 0 4px 12px ${accent}44; flex-shrink: 0;">${icon}</div>
                <div style="min-width:0;flex:1;">
                    <div style="display:flex;align-items:center;gap:8px;flex-wrap:wrap;">
                        <span style="font-size:${CHAT_NOTICE_CHIP_FONT_SIZE};font-weight:900;letter-spacing:.05em;color:${accent}; text-shadow: 0.5px 0.5px 0px rgba(0,0,0,0.05);">${typeLabel}</span>
                        <span style="font-size:${CHAT_NOTICE_CHIP_FONT_SIZE};color:#475569;font-weight:bold;">${levelName}</span>
                        <span style="font-size:${CHAT_NOTICE_META_FONT_SIZE};color:#94a3b8;">(${timeStr})</span>
                    </div>
                    <div style="margin-top:4px;font-size:${CHAT_NOTICE_BODY_FONT_SIZE};line-height:1.6;color:#1e293b;font-weight:500;">${safeText}</div>
                </div>
                <div style="position:absolute; right:-10px; bottom:-10px; font-size:${CHAT_NOTICE_DECOR_ICON_FONT_SIZE}; opacity:0.05; transform:rotate(-15deg); pointer-events:none;">${icon}</div>
            </div>
        `;
        timeStrOverride = true;
    } else if (msg.action === "欢迎") {
        div.style.cssText =
            "background: linear-gradient(135deg, #eff6ff, #f0f9ff); border: 1.5px solid #3b82f6; border-radius: 5px; padding: 5px 10px; margin: 3px 0; box-shadow: 0 1px 3px rgba(59,130,246,0.12);";
        const userName = msg.from_user;
        const rawContent = msg.content || "";
        const colonIndex = rawContent.indexOf("：");
        let clickablePrefix = "";
        let bodyPart = rawContent;
        if (colonIndex !== -1) {
            const prefixStr = rawContent.substring(0, colonIndex);
            bodyPart = rawContent.substring(colonIndex);
            const lastIdx = prefixStr.lastIndexOf(userName);
            if (lastIdx !== -1) {
                clickablePrefix =
                    prefixStr.substring(0, lastIdx) +
                    clickableUser(userName, "#1d4ed8", nameClass);
            } else {
                clickablePrefix = prefixStr;
            }
        }
        const parsedBody = parseBracketUsers(bodyPart, "#1d4ed8");
        html = `<div style="color: #1e40af;">💬 ${clickablePrefix}${parsedBody} <span style="color: #93c5fd; font-size: ${CHAT_NOTICE_META_FONT_SIZE}; font-weight: normal;">(${timeStr})</span></div>`;
        timeStrOverride = true;
    } else if (SYSTEM_USERS.includes(msg.from_user)) {
        if (msg.from_user === "系统公告") {
            if (isRedPacketAnnouncementMessage(msg)) {
                html = buildRedPacketAnnouncementHtml(msg, timeStr);
                timeStrOverride = true;
            } else {
                div.style.cssText =
                    "background: linear-gradient(135deg, #fef2f2, #fff1f2); border: 2px solid #ef4444; border-radius: 8px; padding: 10px 14px; margin: 6px 0; box-shadow: 0 3px 8px rgba(239,68,68,0.16);";
                const parsedContent = parseBracketUsers(msg.content, "#dc2626");
                html = `<div style="font-size: ${CHAT_NOTICE_BODY_FONT_SIZE}; line-height: 1.75; font-weight: 800; color: #dc2626;">${parsedContent} <span style="color: #999; font-size: ${CHAT_NOTICE_META_FONT_SIZE}; font-weight: 500;">(${timeStr})</span></div>`;
                timeStrOverride = true;
            }
        } else if (msg.from_user === "系统传音") {
            const content = msg.content || "";
            const isRedPacketClaimNotification = content.includes("抢到了") && content.includes("礼包");
            const isBaccaratLossCoverNotification = content.includes("【你玩游戏我买单】") || content.includes("金币补偿");
            const isDailySignInNotification = content.includes("完成今日签到") || content.includes("使用补签卡补签");
            const isQuizEndNotification = content.includes("猜谜活动") && (content.includes("已超时结束") || content.includes("正确答案"));
            const isQuizStartNotification = !isQuizEndNotification && (isIdiomStartMessage || content.includes("猜谜活动") || content.includes("猜成语时间"));
            const systemGameCardMeta = resolveGameNotificationCardMeta(msg);
            const isPlainNotification = content.includes("购买了");

            if (isQuizEndNotification) {
                html = buildQuizResultHtml(msg, timeStr);
                timeStrOverride = true;
            } else if (isQuizStartNotification) {
                div.style.cssText =
                    "background:linear-gradient(135deg,#fff7ed,#fffbeb);border:1px solid rgba(245,158,11,.28);border-left:4px solid #f59e0b;border-radius:12px;padding:8px 12px;margin:4px 0;box-shadow:0 10px 24px rgba(245,158,11,.14);";
                html = `
                    <div style="display:flex;align-items:flex-start;gap:10px;">
                        <div style="width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,#f59e0b,#f97316);display:flex;align-items:center;justify-content:center;color:#fff;font-size:${CHAT_NOTICE_LARGE_ICON_FONT_SIZE};box-shadow:0 8px 18px rgba(249,115,22,.22);flex-shrink:0;">📣</div>
                        <div style="min-width:0;flex:1;">
                            <div style="display:flex;align-items:center;gap:8px;flex-wrap:wrap;">
                                ${buildQuizBadgeHtml(msg, "#d97706")}
                                <span class="msg-time">(${timeStr})</span>
                            </div>
                            <div style="margin-top:7px;color:#9a3412;font-size:${CHAT_NOTICE_BODY_FONT_SIZE};font-weight:800;line-height:1.75;">${parseBracketUsers(content, "#b45309")}</div>
                        </div>
                    </div>
                `;
                timeStrOverride = true;
            } else if (isRedPacketClaimNotification || isBaccaratLossCoverNotification || isDailySignInNotification) {
                let plainAccentContent = parseBracketUsers(msg.content);
                html = `<span style="color: #b45309;">🌟 ${plainAccentContent}</span>`;
            } else if (systemGameCardMeta) {
                html = buildSystemGameNotificationHtml(msg, timeStr);
                timeStrOverride = true;
            } else if (isPlainNotification) {
                let parsedContent = parseBracketUsers(msg.content);
                html = `${headImg}<span style="font-weight: bold;">${clickableUser(msg.from_user, fontColor, nameClass)}：</span><span class="msg-content${textColorClass}" style="color: ${fontColor}; font-weight: bold;">${parsedContent}</span>`;
            } else {
                div.style.cssText =
                    "background: #fffbeb; border-left: 3px solid #d97706; border-radius: 4px; padding: 4px 10px; margin: 2px 0;";
                let sysTranContent = parseBracketUsers(msg.content);
                html = `<span style="color: #b45309;">🌟 ${sysTranContent}</span>`;
            }
        } else if (resolveGameNotificationCardMeta(msg)) {
            html = buildSystemGameNotificationHtml(msg, timeStr);
            timeStrOverride = true;
        } else if (msg.from_user === "系统" && msg.to_user && msg.to_user !== "大家") {
            div.style.cssText =
                "background:#f0fdf4;border-left:3px solid #16a34a;border-radius:4px;padding:3px 8px;margin:2px 0;";
            html = `<span style="color:#16a34a;font-weight:bold;">📢 系统：</span><span style="color:#15803d;">${msg.content}</span>`;
        } else {
            let giftHtml = "";
            if (msg.gift_image) {
                giftHtml = `<img src="${msg.gift_image}" alt="${msg.gift_name || ""}" style="display:inline-block;width:40px;height:40px;vertical-align:middle;margin-left:6px;animation:giftBounce 0.6s ease-in-out;">`;
            }
            let parsedContent = parseBracketUsers(msg.content);
            html = `${headImg}<span style="font-weight: bold;">${clickableUser(msg.from_user, fontColor, nameClass)}：</span><span class="msg-content${textColorClass}" style="color: ${fontColor}">${parsedContent}</span>${giftHtml}`;
        }
    } else if (msg.is_secret) {
        if (msg.from_user === "系统") {
            div.style.cssText =
                "background:#f0fdf4;border-left:3px solid #16a34a;border-radius:4px;padding:3px 8px;margin:2px 0;";
            html = `<span style="color:#16a34a;font-weight:bold;">📢 系统：</span><span style="color:#15803d;">${msg.content}</span>`;
        } else {
            const fromHtml = clickableUser(msg.from_user, "#cc00cc", nameClass);
            const toHtml = clickableUser(msg.to_user, "#cc00cc");
            const verbStr = msg.action ?
                buildActionStr(msg.action, fromHtml, toHtml, "悄悄说") :
                `${fromHtml}对${toHtml}悄悄说：`;
            html = `${headImg}<span class="msg-secret">${verbStr}</span><span class="msg-content${textColorClass}" style="color: ${fontColor}; font-style: italic;">${messageBodyHtml}</span>`;
        }
    } else if (msg.to_user && msg.to_user !== "大家") {
        const fromHtml = clickableUser(msg.from_user, "#000099", nameClass);
        const toHtml = clickableUser(msg.to_user, "#000099");
        const verbStr = msg.action ?
            buildActionStr(msg.action, fromHtml, toHtml) :
            `${fromHtml}对${toHtml}说：`;
        html = `${headImg}${verbStr}<span class="msg-content${textColorClass}" style="color: ${fontColor}">${messageBodyHtml}</span>`;
    } else {
        const fromHtml = clickableUser(msg.from_user, "#000099", nameClass);
        const everyoneHtml = clickableUser("大家", "#000099");
        const verbStr = msg.action ?
            buildActionStr(msg.action, fromHtml, everyoneHtml) :
            `${fromHtml}对${everyoneHtml}说：`;
        html = `${headImg}${verbStr}<span class="msg-content${textColorClass}" style="color: ${fontColor}">${messageBodyHtml}</span>`;
    }

    if (!timeStrOverride) {
        html += ` <span class="msg-time">(${timeStr})</span>`;
    }
    div.innerHTML = html;
    attachIdiomAnswerButton(div, msg);

    // 历史消息恢复或实时结算时，都立即把对应回合按钮置为结束态，保留消息结构便于回看。
    if (quizMeta.endedRoundId > 0) {
        disableIdiomAnswerButtons(quizMeta.endedRoundId, "本回合已结束", String(msg.winner_username || ""));
    }

    // 命中屏蔽规则时，消息仍保留在 DOM 中，便于取消屏蔽后立即恢复显示。
    if (shouldHideByBlock) {
        div.dataset.blockHidden = "1";
        div.style.display = "none";
    }

    // 后端下发的带有 welcome_user 的系统欢迎/离开消息，替换同类旧消息
    if (msg.welcome_user) {
        const welcomeKind = msg.welcome_kind || "entry_broadcast";
        div.setAttribute("data-system-user", msg.welcome_user);
        div.setAttribute("data-system-welcome-kind", welcomeKind);
        const removeSameWelcome = (root) => {
            root?.querySelectorAll("[data-system-user]").forEach((el) => {
                if (el.dataset.systemUser === msg.welcome_user && (el.dataset.systemWelcomeKind || "entry_broadcast") === welcomeKind) {
                    el.remove();
                }
            });
        };
        removeSameWelcome(state.container);
        removeSameWelcome(renderBatch?.publicFragment);
        removeSameWelcome(renderBatch?.privateFragment);
    }

    // 存点通知标记
    const isAutoSave = (msg.from_user === "系统" || msg.from_user === "") &&
        msg.content && (msg.content.includes("自动存点") || msg.content.includes("手动存点"));
    if (isAutoSave) {
        div.dataset.autosave = "1";
    }

    if (isRelatedToMe) {
        if (isAutoSave) {
            state.lastAutosaveNode?.remove();
            state.lastAutosaveNode = div;
        }
        if (renderBatch) {
            renderBatch.privateFragment.appendChild(div);
            renderBatch.shouldPrunePrivate = true;
            renderBatch.shouldScrollPrivate = renderBatch.shouldScrollPrivate || state.autoScroll;
            if (msg.action === "idiom_result") {
                renderBatch.shouldPrunePrivateIdiomResults = true;
            }
            return;
        }
        const container2 = state.container2;
        if (container2) {
            container2.appendChild(div);
            pruneMessageContainer(container2, PRIVATE_MESSAGE_NODE_LIMIT);
            if (msg.action === "idiom_result") {
                prunePrivateIdiomResultMessages(container2, 3);
            }
            if (state.autoScroll) {
                container2.scrollTop = container2.scrollHeight;
            }
        }
    } else {
        if (renderBatch) {
            renderBatch.publicFragment.appendChild(div);
            renderBatch.shouldPrunePublic = true;
            renderBatch.shouldScrollPublic = renderBatch.shouldScrollPublic || state.autoScroll;
            return;
        }
        const container = state.container;
        if (container) {
            container.appendChild(div);
            pruneMessageContainer(container, PUBLIC_MESSAGE_NODE_LIMIT);
            if (state.autoScroll) {
                container.scrollTop = container.scrollHeight;
            }
        }
    }
}

/**
 * 裁剪聊天窗口内过旧的消息节点，防止长时间在线后 DOM 无限膨胀。
 */
export function pruneMessageContainer(targetContainer, maxNodes) {
    if (!targetContainer || targetContainer.childElementCount <= maxNodes) {
        return;
    }

    const state = window.chatState;
    while (targetContainer.childElementCount > maxNodes) {
        const firstNode = targetContainer.firstElementChild;
        if (state && firstNode === state.lastAutosaveNode) {
            state.lastAutosaveNode = null;
        }
        firstNode?.remove();
    }
}

/**
 * 创建聊天消息批量渲染上下文。
 */
export function createChatMessageRenderBatch() {
    return {
        publicFragment: document.createDocumentFragment(),
        privateFragment: document.createDocumentFragment(),
        shouldPrunePublic: false,
        shouldPrunePrivate: false,
        shouldPrunePrivateIdiomResults: false,
        shouldScrollPublic: false,
        shouldScrollPrivate: false,
    };
}

/**
 * 提交批量渲染的聊天消息，并把裁剪和滚动合并到每批一次。
 */
export function commitChatMessageRenderBatch(renderBatch) {
    const state = window.chatState;
    if (!state) return;

    const hasPublicMessages = renderBatch.publicFragment.childNodes.length > 0;
    const hasPrivateMessages = renderBatch.privateFragment.childNodes.length > 0;

    if (hasPublicMessages) {
        const container = state.container;
        if (container) container.appendChild(renderBatch.publicFragment);
    }
    if (hasPrivateMessages) {
        const container2 = state.container2;
        if (container2) container2.appendChild(renderBatch.privateFragment);
    }
    if (renderBatch.shouldPrunePublic) {
        const container = state.container;
        if (container) pruneMessageContainer(container, PUBLIC_MESSAGE_NODE_LIMIT);
    }
    if (renderBatch.shouldPrunePrivate) {
        const container2 = state.container2;
        if (container2) pruneMessageContainer(container2, PRIVATE_MESSAGE_NODE_LIMIT);
    }
    if (renderBatch.shouldPrunePrivateIdiomResults) {
        const container2 = state.container2;
        if (container2) prunePrivateIdiomResultMessages(container2, 3);
    }
    if (renderBatch.shouldScrollPublic) {
        const container = state.container;
        if (container) container.scrollTop = container.scrollHeight;
    }
    if (renderBatch.shouldScrollPrivate) {
        const container2 = state.container2;
        if (container2) container2.scrollTop = container2.scrollHeight;
    }
}

/**
 * 将广播消息放入轻量队列，避免连续广播时同步挤占同一帧的 DOM 渲染。
 */
export function enqueueChatMessage(msg) {
    const state = window.chatState;
    if (!state) return;

    state.trackMaxMsgId(msg.id || 0);
    state.pendingChatMessages.push(msg);

    if (state.chatMessageFlushTimer !== null) {
        return;
    }

    const scheduleFlush = window.requestAnimationFrame || ((callback) => window.setTimeout(callback, 16));
    state.chatMessageFlushTimer = scheduleFlush(flushQueuedChatMessages);
}

/**
 * 判断是否为普通用户聊天消息（非系统/游戏通知）。
 */
function isUserChatMessage(msg) {
    if (!msg || !msg.from_user) return false;
    const u = msg.from_user;
    if (SYSTEM_USERS.includes(u)) return false;
    if (u.endsWith("播报")) return false;
    if (u === "百家乐" || u === "跑马") return false;
    return true;
}

/** 后台恢复时系统通知最多保留条数 */
const MAX_SYSTEM_BURST = 20;
/** 后台恢复时超过该时间的系统通知直接丢弃（分钟） */
const MAX_SYSTEM_AGE_MINUTES = 10;

/**
 * 分批渲染待处理消息，给动画、输入和滚动留出主线程时间。
 */
export function flushQueuedChatMessages() {
    const state = window.chatState;
    if (!state) return;

    state.chatMessageFlushTimer = null;

    // 大批量消息堆积（后台标签页恢复）时，保留所有用户聊天记录，
    // 但过时的系统/游戏通知只保留最近 MAX_SYSTEM_BURST 条。
    if (state.pendingChatMessages.length > MAX_SYSTEM_BURST + 30) {
        const now = Date.now();
        const maxAge = MAX_SYSTEM_AGE_MINUTES * 60 * 1000;
        const totalSystem = state.pendingChatMessages.filter((m) => !isUserChatMessage(m)).length;
        let systemSeen = 0;
        let dropped = 0;

        const filtered = state.pendingChatMessages.filter((msg) => {
            if (isUserChatMessage(msg)) return true;

            systemSeen++;

            // 超过10分钟的系统通知直接丢弃
            let msgTime = 0;
            if (msg.sent_at) {
                msgTime = new Date(msg.sent_at.replace(" ", "T")).getTime();
            }
            if (msgTime > 0 && now - msgTime > maxAge) {
                dropped++;
                return false;
            }

            // 从旧到新遍历，只保留最后 MAX_SYSTEM_BURST 条系统通知
            const remainingAfter = totalSystem - systemSeen;
            if (remainingAfter >= MAX_SYSTEM_BURST) {
                dropped++;
                return false;
            }

            return true;
        });

        if (dropped > 0) {
            const container = state.container;
            if (container) {
                const notice = document.createElement("div");
                notice.className = "msg-line msg-burst-notice";
                notice.style.cssText =
                    `text-align:center;padding:6px 0;margin:4px 0;font-size:${CHAT_NOTICE_META_FONT_SIZE};color:#94a3b8;border-top:1px dashed #d1d5db;border-bottom:1px dashed #d1d5db;`;
                notice.textContent = `⏫ 省略了 ${dropped} 条系统通知`;
                container.appendChild(notice);
            }
        }

        state.pendingChatMessages = filtered;
    }

    const batch = state.pendingChatMessages.splice(0, CHAT_MESSAGE_FLUSH_BATCH_SIZE);
    const renderBatch = createChatMessageRenderBatch();
    batch.forEach((msg) => appendMessage(msg, renderBatch));
    commitChatMessageRenderBatch(renderBatch);

    if (state.pendingChatMessages.length === 0) {
        return;
    }

    const scheduleFlush = window.requestAnimationFrame || ((callback) => window.setTimeout(callback, 16));
    state.chatMessageFlushTimer = scheduleFlush(flushQueuedChatMessages);
}

// ── 挂载到 window 供 Blade 脚本及其他模块使用 ──
window.appendMessage = appendMessage;
window.buildChatMessageContent = buildChatMessageContent;
window.pruneMessageContainer = pruneMessageContainer;
window.createChatMessageRenderBatch = createChatMessageRenderBatch;
window.commitChatMessageRenderBatch = commitChatMessageRenderBatch;
window.enqueueChatMessage = enqueueChatMessage;
window.flushQueuedChatMessages = flushQueuedChatMessages;

export { clickableUser, buildActionStr, parseBracketUsers };