// 拍一拍功能模块
// 拦截输入框中的 /拍一拍 命令，向所选对象发送拍一拍通知并触发屏幕抖动。

import { pruneMessageContainer } from "./message-renderer.js";

function csrf() {
    return document.querySelector('meta[name="csrf-token"]')?.content ?? "";
}

/**
 * 判断输入是否为 /拍一拍 命令。
 */
function isPatCommand(text) {
    return /^\/拍一拍\s*$/.test(text);
}

/**
 * 获取当前选中的聊天对象。
 */
function getSelectedTarget() {
    const toUserSelect = document.getElementById("to_user");
    if (!toUserSelect) return null;
    const val = toUserSelect.value?.trim();
    return val || null;
}

/**
 * 执行拍一拍请求。
 */
async function executePat() {
    const targetUser = getSelectedTarget();
    if (!targetUser || targetUser === "大家") {
        window.chatDialog?.alert("请先选择一个聊天对象（不能为大家），再进行拍一拍。", "拍一拍", "#f472b6");
        return false;
    }

    const roomId = window.chatContext?.roomId;
    if (!roomId) return false;

    try {
        const response = await fetch(`/room/${roomId}/pat`, {
            method: "POST",
            headers: {
                "X-CSRF-TOKEN": csrf(),
                "Content-Type": "application/json",
                "Accept": "application/json",
            },
            body: JSON.stringify({ target_user: targetUser }),
        });

        const data = await response.json();

        if (data.status === "success") {
            // 清空输入并触发本机抖动
            const contentInput = document.getElementById("content");
            if (contentInput) {
                contentInput.value = "";
                if (typeof window.persistChatDraft === "function") {
                    window.persistChatDraft("");
                }
                contentInput.focus();
            }
            triggerPatShake();
            return true;
        }

        window.chatDialog?.alert(data.message || "拍一拍失败", "拍一拍", "#f472b6");
        return false;
    } catch (error) {
        console.error("拍一拍请求失败:", error);
        window.chatDialog?.alert("网络错误，拍一拍发送失败。", "拍一拍", "#f472b6");
        return false;
    }
}

/**
 * 触发屏幕抖动动画。
 */
function triggerPatShake() {
    const layout = document.querySelector(".chat-layout");
    if (!layout) return;

    layout.classList.remove("chat-shake");
    // 强制回流后重新添加动画
    void layout.offsetWidth;
    layout.classList.add("chat-shake");

    // 动画结束后移除 class
    setTimeout(() => {
        layout.classList.remove("chat-shake");
    }, 500);
}

/**
 * 添加拍一拍消息到聊天窗口（使用正常聊天样式渲染）。
 */
function appendPatMessage(displayText, fromUserHeadface, fromUser, targetUser) {
    const state = window.chatState;
    const container = state?.container;
    if (!container) return;

    const now = new Date();
    const timeStr = now.getHours().toString().padStart(2, "0") + ":" +
        now.getMinutes().toString().padStart(2, "0") + ":" +
        now.getSeconds().toString().padStart(2, "0");

    const fromUserSafe = fromUser || "";
    const targetUserSafe = targetUser || "";

    // 获取发送者的在线数据，获取正确头像
    const senderInfo = state.onlineUsers[fromUserSafe];
    const senderHead = (senderInfo && senderInfo.headface) || "1.gif";
    let headImgSrc = senderHead.startsWith("storage/") ? "/" + senderHead : "/images/headface/" + senderHead;

    const 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\'">';

    // 可点击用户名（与正常消息一致）
    const fromHtml = '<span class="msg-user" data-chat-message-user data-u="' + fromUserSafe + '" style="color: #000099; cursor: pointer;">' + fromUserSafe + '</span>';
    const toHtml = '<span class="msg-user" data-chat-message-user data-u="' + targetUserSafe + '" style="color: #000099; cursor: pointer;">' + targetUserSafe + '</span>';

    const div = document.createElement("div");
    div.className = "msg-line";
    if (fromUserSafe) {
        div.dataset.fromUser = fromUserSafe;
    }

    div.innerHTML = headImg + fromHtml + "对" + toHtml + "说：<span class=\"msg-content\" style=\"color: #000000\">👋 我刚拍了拍你</span> <span class=\"msg-time\">(" + timeStr + ")</span>";

    // 路由规则：发送者和被拍者在包厢看到，其他用户在公屏看到
    const currentUser = window.chatContext?.username || "";
    const isRelatedToMe = fromUser === currentUser || targetUser === currentUser;

    if (isRelatedToMe) {
        const container2 = state?.container2;
        if (container2) {
            container2.appendChild(div);
            pruneMessageContainer(container2, 300);
            if (state?.autoScroll) {
                container2.scrollTop = container2.scrollHeight;
            }
        }
    } else {
        container.appendChild(div);
        pruneMessageContainer(container, 600);
        if (state?.autoScroll) {
            container.scrollTop = container.scrollHeight;
        }
    }
}

// ── 导出 ──
export { isPatCommand, executePat, triggerPatShake, appendPatMessage };

// 挂载到 window 供其他模块使用
window.isPatCommand = isPatCommand;
window.executePat = executePat;
window.triggerPatShake = triggerPatShake;
window.appendPatMessage = appendPatMessage;