import { useEffect, useMemo, useState } from 'react';
import { Outlet, useLocation, useNavigate } from 'react-router-dom';
import { Avatar, Breadcrumb, Drawer, Dropdown, Layout } from 'antd';
import type { MenuProps } from 'antd';
import {
    LockOutlined,
    LogoutOutlined,
    MenuFoldOutlined,
    MenuUnfoldOutlined,
    RightOutlined,
    UserOutlined,
} from '@ant-design/icons';
import SidebarMenu from './SidebarMenu';
import PlatformSelector from './PlatformSelector';
import { getBreadcrumbItems } from './menuConfig';
import { useSession } from '@/services/session';
import './MainLayout.css';

const { Header, Sider, Content } = Layout;

const MainLayout = () => {
    const [collapsed, setCollapsed] = useState(false);
    const [mobileMenuOpen, setMobileMenuOpen] = useState(false);
    const [isMobile, setIsMobile] = useState(false);
    const [loggingOut, setLoggingOut] = useState(false);
    const location = useLocation();
    const navigate = useNavigate();
    const { session, logout } = useSession();

    const breadcrumbItems = useMemo(
        () =>
            getBreadcrumbItems(location.pathname).map((crumb) => ({
                title: (
                    <span className="breadcrumb-crumb">
                        {crumb.icon}
                        <span>{crumb.label}</span>
                    </span>
                ),
            })),
        [location.pathname]
    );

    const userDisplayName = session ? (session.user.display_name ?? session.user.email) : '';
    const userInitial = userDisplayName.charAt(0).toUpperCase();

    const handleLogout = async () => {
        setLoggingOut(true);
        try {
            await logout();
        } finally {
            setLoggingOut(false);
            navigate('/login', { replace: true });
        }
    };

    const handleUserMenuClick: MenuProps['onClick'] = ({ key }) => {
        if (key === 'profile') {
            navigate('/settings/profile');
        } else if (key === 'password') {
            navigate('/settings/password');
        } else if (key === 'logout') {
            void handleLogout();
        }
    };

    const userMenuItems: MenuProps['items'] = [
        { key: 'profile', icon: <UserOutlined />, label: '修改资料' },
        { key: 'password', icon: <LockOutlined />, label: '修改密码' },
        { type: 'divider' },
        {
            key: 'logout',
            icon: <LogoutOutlined />,
            label: loggingOut ? '退出中…' : '退出登录',
            disabled: loggingOut,
        },
    ];

    useEffect(() => {
        const checkMobile = () => {
            setIsMobile(window.innerWidth < 768);
            if (window.innerWidth >= 768) setMobileMenuOpen(false);
        };
        checkMobile();
        window.addEventListener('resize', checkMobile);
        return () => window.removeEventListener('resize', checkMobile);
    }, []);

    return (
        <Layout className="main-layout">
            {!isMobile && (
                <Sider
                    className="main-sider"
                    width={200}
                    collapsedWidth={60}
                    collapsed={collapsed}
                    theme="dark"
                    style={{
                        overflow: 'auto',
                        height: '100vh',
                        position: 'fixed',
                        left: 0,
                        top: 0,
                        bottom: 0,
                    }}
                >
                    <div className="sidebar-header">
                        <div className="logo">
                            <span className="logo-full">Atlas Kit</span>
                            <span className="logo-short">A</span>
                        </div>
                        <div className="logo-subtitle">商品工作台</div>
                    </div>
                    <SidebarMenu collapsed={collapsed} />
                </Sider>
            )}

            {isMobile && (
                <Drawer
                    title="Atlas Kit"
                    placement="left"
                    onClose={() => setMobileMenuOpen(false)}
                    open={mobileMenuOpen}
                    styles={{ body: { padding: 0, background: 'var(--sider-bg)' } }}
                    width={200}
                >
                    <SidebarMenu collapsed={false} onMenuClick={() => setMobileMenuOpen(false)} />
                </Drawer>
            )}

            <Layout
                className="main-content-layout"
                style={{
                    marginLeft: isMobile ? 0 : collapsed ? 60 : 200,
                    transition: 'margin-left 0.2s',
                }}
            >
                <Header className="main-header">
                    <div className="header-left">
                        {isMobile && (
                            <MenuFoldOutlined
                                className="mobile-menu-trigger"
                                onClick={() => setMobileMenuOpen(true)}
                            />
                        )}
                        {!isMobile && (
                            <div
                                className="collapse-trigger"
                                onClick={() => setCollapsed(!collapsed)}
                            >
                                {collapsed ? <MenuUnfoldOutlined /> : <MenuFoldOutlined />}
                            </div>
                        )}
                        <Breadcrumb
                            className="page-breadcrumb"
                            separator={<RightOutlined style={{ fontSize: 12 }} />}
                            items={breadcrumbItems}
                        />
                    </div>
                    {session && (
                        <div className="header-right">
                            <PlatformSelector />
                            <Dropdown
                                menu={{ items: userMenuItems, onClick: handleUserMenuClick }}
                                trigger={['hover']}
                                placement="bottomRight"
                            >
                                <div className="header-user-trigger" title={userDisplayName}>
                                    <Avatar
                                        size={28}
                                        style={{ backgroundColor: 'var(--sider-bg)' }}
                                    >
                                        {userInitial}
                                    </Avatar>
                                    <span className="header-user-name">{userDisplayName}</span>
                                </div>
                            </Dropdown>
                        </div>
                    )}
                </Header>

                <Content className="main-content">
                    <Outlet />
                </Content>
            </Layout>
        </Layout>
    );
};

export default MainLayout;