// 聊天消息工具函数，承接主消息渲染脚本里可独立复用的判断逻辑。

/**
 * 判断图片消息是否已经超过前端允许展示的保留期。
 *
 * @param {Record<string, any>|null|undefined} message 聊天消息
 * @param {number} retentionDays 图片保留天数
 * @param {number} nowTimestamp 当前时间戳
 * @returns {boolean}
 */
export function isExpiredChatImageMessage(
    message,
    retentionDays = Number.parseInt(window.chatContext?.chatImageRetentionDays || 3, 10),
    nowTimestamp = Date.now(),
) {
    if (!message) {
        return false;
    }

    if (message.message_type === "expired_image") {
        return true;
    }

    if (message.message_type !== "image") {
        return false;
    }

    if (!message.image_url || !message.image_thumb_url) {
        return true;
    }

    const sentAtText = String(message.sent_at || "").replace(" ", "T");
    const sentAt = sentAtText ? new Date(sentAtText) : null;

    if (!sentAt || Number.isNaN(sentAt.getTime())) {
        return false;
    }

    return nowTimestamp >= sentAt.getTime() + retentionDays * 24 * 60 * 60 * 1000;
}

/**
 * 只清理当前浏览器的聊天窗口，并记录本地清屏的最大消息 ID。
 *
 * @param {number|string} roomId 房间 ID
 * @param {number|string} maxMessageId 当前已接收最大消息 ID
 * @returns {void}
 */
export function localClearScreen(roomId = window.chatContext?.roomId, maxMessageId = 0) {
    const publicPane = document.getElementById("chat-messages-container");
    const privatePane = document.getElementById("chat-messages-container2");

    if (publicPane) {
        publicPane.innerHTML = "";
    }

    if (privatePane) {
        privatePane.innerHTML = "";
    }

    // 刷新页面时只恢复本地清屏点之后的新消息，避免旧消息重新回流。
    localStorage.setItem(`local_clear_msg_id_${roomId}`, maxMessageId);

    const notice = document.createElement("div");
    notice.className = "msg-line";

    const now = new Date();
    const timeText = [
        now.getHours().toString().padStart(2, "0"),
        now.getMinutes().toString().padStart(2, "0"),
        now.getSeconds().toString().padStart(2, "0"),
    ].join(":");

    notice.innerHTML = `<span style="color: #64748b; font-weight: bold;">🧹 您已执行本地清屏</span><span class="msg-time">(${timeText})</span>`;

    if (publicPane) {
        publicPane.appendChild(notice);
        publicPane.scrollTop = publicPane.scrollHeight;
    }
}