import React, { useState, useEffect } from 'react';
import { Row, Col, Card, Typography, Spin } from 'antd';
import {
    UserOutlined,
    MobileOutlined,
    AppstoreOutlined,
    InboxOutlined,
    CheckCircleOutlined,
    DatabaseOutlined,
} from '@ant-design/icons';
import { Pie, Column } from '@ant-design/charts';
import request from '../../api/request';
import { statColors } from '../../theme/tokens';

const { Title } = Typography;

interface DashboardStats {
    user_count: number;
    device_count: number;
    device_type_count: number;
    batch_count: number;
    bound_device_count: number;
    in_stock_device_count: number;
}

const getDashboardStats = async (): Promise<DashboardStats> => {
    const res = await request.get<unknown, { data: DashboardStats }>('/api/admin/dashboard/stats/');
    return res.data;
};

const Dashboard: React.FC = () => {
    const [loading, setLoading] = useState(true);
    const [stats, setStats] = useState<DashboardStats>({
        user_count: 0,
        device_count: 0,
        device_type_count: 0,
        batch_count: 0,
        bound_device_count: 0,
        in_stock_device_count: 0,
    });

    useEffect(() => {
        loadStats();
    }, []);

    const loadStats = async () => {
        try {
            const data = await getDashboardStats();
            setStats(data);
        } catch (error) {
            // 静默失败，使用默认值
        } finally {
            setLoading(false);
        }
    };

    const statCards = [
        {
            title: '用户总数',
            value: stats.user_count,
            icon: <UserOutlined />,
            color: statColors.primary,
            bgColor: 'rgba(99, 102, 241, 0.08)',
        },
        {
            title: '设备总数',
            value: stats.device_count,
            icon: <MobileOutlined />,
            color: statColors.success,
            bgColor: 'rgba(16, 185, 129, 0.08)',
        },
        {
            title: '设备类型',
            value: stats.device_type_count,
            icon: <AppstoreOutlined />,
            color: statColors.purple,
            bgColor: 'rgba(139, 92, 246, 0.08)',
        },
        {
            title: '入库批次',
            value: stats.batch_count,
            icon: <InboxOutlined />,
            color: statColors.warning,
            bgColor: 'rgba(245, 158, 11, 0.08)',
        },
        {
            title: '已绑定设备',
            value: stats.bound_device_count,
            icon: <CheckCircleOutlined />,
            color: statColors.cyan,
            bgColor: 'rgba(6, 182, 212, 0.08)',
        },
        {
            title: '库存设备',
            value: stats.in_stock_device_count,
            icon: <DatabaseOutlined />,
            color: statColors.pink,
            bgColor: 'rgba(236, 72, 153, 0.08)',
        },
    ];

    // 设备状态分布数据
    const otherCount = Math.max(0, stats.device_count - stats.in_stock_device_count - stats.bound_device_count);
    const pieData = [
        { type: '库存中', value: stats.in_stock_device_count },
        { type: '已绑定', value: stats.bound_device_count },
        ...(otherCount > 0 ? [{ type: '其他', value: otherCount }] : []),
    ];

    const pieConfig = {
        data: pieData,
        angleField: 'value',
        colorField: 'type',
        radius: 0.85,
        innerRadius: 0.6,
        color: [statColors.primary, statColors.success, statColors.warning],
        label: {
            text: (d: { type: string; value: number }) => `${d.type}\n${d.value}`,
            style: { fontSize: 12, fontWeight: 500 },
        },
        legend: {
            color: {
                position: 'bottom' as const,
                layout: { justifyContent: 'center' as const },
            },
        },
        interaction: {
            elementHighlight: true,
        },
    };

    // 数据概览柱状图
    const columnData = [
        { name: '用户', value: stats.user_count, type: '数量' },
        { name: '设备', value: stats.device_count, type: '数量' },
        { name: '已绑定', value: stats.bound_device_count, type: '数量' },
        { name: '库存', value: stats.in_stock_device_count, type: '数量' },
        { name: '批次', value: stats.batch_count, type: '数量' },
        { name: '类型', value: stats.device_type_count, type: '数量' },
    ];

    const columnConfig = {
        data: columnData,
        xField: 'name',
        yField: 'value',
        color: statColors.primary,
        style: {
            radiusTopLeft: 6,
            radiusTopRight: 6,
            fill: statColors.primary,
            fillOpacity: 0.85,
        },
        label: {
            text: (d: { value: number }) => `${d.value}`,
            textBaseline: 'bottom' as const,
            style: { dy: -4, fontSize: 12 },
        },
        axis: {
            y: { title: false },
            x: { title: false },
        },
    };

    return (
        <div>
            <Title level={4} style={{ marginBottom: 24, color: '#1f2937' }}>
                仪表盘
            </Title>

            <Spin spinning={loading}>
                {/* Stat Cards */}
                <Row gutter={[16, 16]}>
                    {statCards.map((stat, index) => (
                        <Col xs={24} sm={12} lg={8} xl={4} key={index}>
                            <Card
                                hoverable
                                styles={{ body: { padding: '20px' } }}
                            >
                                <div style={{ display: 'flex', alignItems: 'center', gap: 14 }}>
                                    <div
                                        style={{
                                            width: 44,
                                            height: 44,
                                            borderRadius: 12,
                                            background: stat.bgColor,
                                            display: 'flex',
                                            alignItems: 'center',
                                            justifyContent: 'center',
                                            fontSize: 20,
                                            color: stat.color,
                                            flexShrink: 0,
                                        }}
                                    >
                                        {stat.icon}
                                    </div>
                                    <div>
                                        <div style={{ fontSize: 12, color: '#6b7280', marginBottom: 2 }}>
                                            {stat.title}
                                        </div>
                                        <div style={{ fontSize: 24, fontWeight: 700, color: '#1f2937', lineHeight: 1.2 }}>
                                            {stat.value.toLocaleString()}
                                        </div>
                                    </div>
                                </div>
                            </Card>
                        </Col>
                    ))}
                </Row>

                {/* Charts */}
                <Row gutter={[16, 16]} style={{ marginTop: 16 }}>
                    <Col xs={24} lg={12}>
                        <Card
                            title="设备状态分布"
                            styles={{ body: { padding: '16px 24px' } }}
                        >
                            <div style={{ height: 320 }}>
                                {stats.device_count > 0 ? (
                                    <Pie {...pieConfig} />
                                ) : (
                                    <div style={{
                                        display: 'flex',
                                        alignItems: 'center',
                                        justifyContent: 'center',
                                        height: '100%',
                                        color: '#9ca3af',
                                    }}>
                                        暂无设备数据
                                    </div>
                                )}
                            </div>
                        </Card>
                    </Col>
                    <Col xs={24} lg={12}>
                        <Card
                            title="数据概览"
                            styles={{ body: { padding: '16px 24px' } }}
                        >
                            <div style={{ height: 320 }}>
                                <Column {...columnConfig} />
                            </div>
                        </Card>
                    </Col>
                </Row>
            </Spin>
        </div>
    );
};

export default Dashboard;