// ============================================================
// AnnouncementDrawer — 公告侧拉抽屉（SPA 内部弹出）
// 数据来源：GET /api/v1/announcements
// ============================================================

import {useEffect, useState, useCallback} from 'react';
import {Drawer, Card, Typography, Empty, Tag, Spin, Modal, Tooltip} from 'antd';
import {NotificationOutlined} from '@ant-design/icons';

import {fetchAnnouncements, type Announcement, AnnouncementListResponse} from '@/services/modules';

const {Text, Paragraph} = Typography;

// ---------- 辅助 ----------

/** 公告类型 → Tag 颜色映射 */
const typeColorMap: Record<string, string> = {
    system: 'blue',
    feature: 'purple',
    activity: 'orange',
    maintenance: 'red',
};

/** 公告类型 → 中文标签 */
const typeLabelMap: Record<string, string> = {
    system: '系统',
    feature: '功能',
    activity: '活动',
    maintenance: '维护',
};

/** 格式化日期（YYYY-MM-DD HH:mm） */
function formatDate(iso: string): string {
    try {
        return new Date(iso).toLocaleDateString('zh-CN', {
            year: 'numeric',
            month: '2-digit',
            day: '2-digit',
            hour: '2-digit',
            minute: '2-digit',
        });
    } catch {
        return iso;
    }
}

// ---------- 组件 ----------

interface AnnouncementDrawerProps {
    open: boolean;
    onClose: () => void;
}

export function AnnouncementDrawer({open, onClose}: AnnouncementDrawerProps) {
    const [list, setList] = useState<Announcement[]>([]);
    const [loading, setLoading] = useState(false);
    const [error, setError] = useState<string | null>(null);

    // 详情 Modal
    const [detail, setDetail] = useState<Announcement | null>(null);

    // 打开抽屉时请求公告列表
    const loadAnnouncements = useCallback(async () => {
        setLoading(true);
        setError(null);
        try {
            const data: AnnouncementListResponse = await fetchAnnouncements();
            setList(data.filter((item: Announcement) => item.is_active));
        } catch (err) {
            setError((err as Error).message || '加载公告失败');
            setList([]);
        } finally {
            setLoading(false);
        }
    }, []);

    useEffect(() => {
        if (open) {
            loadAnnouncements();
        }
    }, [open, loadAnnouncements]);

    // ---- 渲染 ----

    return (
        <>
            <Drawer
                title={
                    <span className="flex items-center gap-2">
                  <NotificationOutlined />
                  公告
               </span>
                }
                placement="right"
                size={380}
                open={open}
                onClose={onClose}
                styles={{body: {padding: 0}}}
            >
                {loading ? (
                    <div className="flex items-center justify-center h-64">
                        <Spin description="加载中..." />
                    </div>
                ) : error ? (
                    <div className="flex items-center justify-center h-64">
                        <Empty description={error} />
                    </div>
                ) : list.length === 0 ? (
                    <div className="flex items-center justify-center h-64">
                        <Empty description="暂无公告" />
                    </div>
                ) : (
                    <div className="flex flex-col gap-3 p-3">
                        {list.map((item:Announcement) => (
                            <Tooltip
                                key={item.id}
                                title={
                                    item.content.length > 100
                                        ? item.content.slice(0, 200) + '…'
                                        : undefined
                                }
                                placement="left"
                            >
                                <Card
                                    size="small"
                                    className="rounded-md! border-0! shadow-sm! cursor-pointer hover:shadow-md! transition-shadow"
                                    title={
                                        <Text strong className="text-sm" ellipsis>
                                            {item.pinned && '📌 '}
                                            {item.title}
                                        </Text>
                                    }
                                    extra={
                                        <Tag
                                            color={typeColorMap[item.type] || 'default'}
                                            className="m-0! text-xs"
                                        >
                                            {typeLabelMap[item.type] || item.type}
                                        </Tag>
                                    }
                                    onClick={() => setDetail(item)}
                                >
                                    <Paragraph
                                        className="mb-2! text-xs"
                                        type="secondary"
                                        ellipsis={{rows: 2}}
                                    >
                                        {item.content}
                                    </Paragraph>
                                    <Text type="secondary" className="text-xs">
                                        {formatDate(item.created_at)}
                                    </Text>
                                </Card>
                            </Tooltip>
                        ))}
                    </div>
                )}
            </Drawer>

            {/* ======== 公告详情 Modal ======== */}
            <Modal
                open={!!detail}
                onCancel={() => setDetail(null)}
                footer={null}
                width={480}
                centered
                title={
                    detail && (
                        <span className="flex items-center gap-2">
                     {detail.pinned && '📌 '}
                            {detail.title}
                  </span>
                    )
                }
            >
                {detail && (
                    <div className="flex flex-col gap-3">
                        <div className="flex items-center gap-2">
                            <Tag
                                color={typeColorMap[detail.type] || 'default'}
                                className="m-0! text-xs"
                            >
                                {typeLabelMap[detail.type] || detail.type}
                            </Tag>
                            <Text type="secondary" className="text-xs">
                                {formatDate(detail.created_at)}
                            </Text>
                        </div>
                        <div className="px-1 py-2 rounded-md"
                             style={{
                                 background: 'var(--color-fill-tertiary, rgba(0,0,0,0.04))',
                             }}
                        >
                            <Paragraph className="mb-0! text-sm leading-relaxed whitespace-pre-wrap">
                                {detail.content}
                            </Paragraph>
                        </div>
                    </div>
                )}
            </Modal>
        </>
    );
}