// 聊天室右下角 Toast 通知组件，提供 window.chatToast.show 兼容入口。

/**
 * 淡出并移除 Toast 卡片。
 *
 * @param {HTMLElement} card
 * @returns {void}
 */
function dismissToast(card) {
    if (card.dataset.toastClosing === "1") {
        return;
    }

    card.dataset.toastClosing = "1";
    card.style.opacity = "0";
    window.setTimeout(() => card.remove(), 400);
}

/**
 * 关闭容器内所有 Toast 卡片。
 *
 * @param {HTMLElement} container
 * @returns {void}
 */
function dismissAllToasts(container) {
    container.querySelectorAll(".chat-toast-card").forEach((card) => {
        if (card instanceof HTMLElement) {
            dismissToast(card);
        }
    });
}

/**
 * 绑定点击 Toast 外部区域时自动关闭。
 *
 * @param {HTMLElement} container
 * @returns {void}
 */
function bindOutsideDismiss(container) {
    document.addEventListener("pointerdown", (event) => {
        if (container.childElementCount === 0) {
            return;
        }

        const target = event.target;
        if (!(target instanceof Element)) {
            return;
        }

        if (target.closest(".chat-toast-card")) {
            return;
        }

        dismissAllToasts(container);
    }, true);
}

/**
 * 创建右下角 Toast 通知 API。
 *
 * @param {HTMLElement} container
 * @returns {{show: Function}}
 */
function createChatToast(container) {
    return {
        /**
         * 显示一条 Toast 通知卡片。
         *
         * @param {object} options
         * @param {string} options.title 标题文字
         * @param {string} options.message 内容 HTML
         * @param {string} [options.icon] 左侧 Emoji
         * @param {string} [options.color] 强调色
         * @param {number} [options.duration] 自动消失毫秒，0 表示不自动消失
         * @param {object|null} [options.action] 操作按钮 { label, onClick }
         * @returns {void}
         */
        show({
            title,
            message,
            icon = "💬",
            color = "#336699",
            duration = 3000,
            action = null,
        }) {
            const card = document.createElement("div");
            card.className = "chat-toast-card";
            card.style.cssText = `
                background:#fff; border-radius:10px; overflow:hidden;
                box-shadow:0 8px 32px rgba(0,0,0,.18);
                min-width:260px; max-width:320px;
                font-size:13px; color:#374151; line-height:1.6;
                pointer-events:all;
                animation:toastSlideIn .3s ease;
                opacity:1; transition:opacity .4s;
            `;

            const actionHtml = action ? `
                <div style="margin-top:8px;">
                    <button class="chat-toast-action-btn"
                        style="background:${color}; color:#fff; border:none; border-radius:6px;
                               padding:5px 14px; font-size:12px; font-weight:bold; cursor:pointer;">
                        ${action.label}
                    </button>
                </div>` : "";

            card.innerHTML = `
                <div style="background:${color}; padding:8px 14px;
                            display:flex; align-items:center; justify-content:space-between;">
                    <span style="color:#fff; font-weight:bold; font-size:13px;">
                        ${icon} ${title}
                    </span>
                    <button class="chat-toast-close"
                        style="background:rgba(255,255,255,.25); border:none; color:#fff;
                               width:22px; height:22px; border-radius:50%; cursor:pointer;
                               font-size:14px; line-height:22px; text-align:center; padding:0;">×</button>
                </div>
                <div style="padding:12px 14px 10px;">
                    <div>${message}</div>
                    ${actionHtml}
                </div>
            `;

            card.querySelector(".chat-toast-close")?.addEventListener("click", () => dismissToast(card));

            if (action) {
                card.querySelector(".chat-toast-action-btn")?.addEventListener("click", () => {
                    action.onClick?.();
                    dismissToast(card);
                });
            }

            container.appendChild(card);

            // Toast 出现时沿用旧体验播放提示音。
            window.chatSound?.ding?.();

            if (duration > 0) {
                window.setTimeout(() => dismissToast(card), duration);
            }
        },
    };
}

/**
 * 绑定全局 Toast API。
 *
 * @returns {void}
 */
export function bindChatToast() {
    if (typeof document === "undefined" || window.chatToast) {
        return;
    }

    const container = document.getElementById("chat-toast-container");
    if (!container) {
        return;
    }

    bindOutsideDismiss(container);
    window.chatToast = createChatToast(container);
}