import { useEffect, useState, type ReactNode } from 'react'
import { Card, Col, Progress, Row, Space, Statistic, Typography, Spin, message } from 'antd'
import {
  ApiOutlined,
  CheckCircleOutlined,
  ClockCircleOutlined,
  CloseCircleOutlined,
  DatabaseOutlined,
  DollarOutlined,
  PercentageOutlined,
  ShopOutlined,
  ShoppingOutlined,
  TeamOutlined,
  WalletOutlined,
} from '@ant-design/icons'
import { dashboardApi } from '../api'
import type { DashboardStats } from '../types'

const numberText = (value?: number) => (value ?? 0).toLocaleString('zh-CN')

function ratio(part: number, total: number) {
  if (total <= 0) return 0
  return Math.round((part / total) * 100)
}

function MetricCard({
  title,
  value,
  icon,
  suffix,
  color,
}: {
  title: string
  value: number
  icon: ReactNode
  suffix?: string
  color?: string
}) {
  return (
    <Card>
      <Statistic
        title={title}
        value={value}
        formatter={() => numberText(value)}
        prefix={icon}
        suffix={suffix}
        valueStyle={color ? { color } : undefined}
      />
    </Card>
  )
}

function StatusLine({
  label,
  value,
  total,
  color,
}: {
  label: string
  value: number
  total: number
  color: string
}) {
  return (
    <div>
      <Space style={{ width: '100%', justifyContent: 'space-between' }}>
        <Typography.Text>{label}</Typography.Text>
        <Typography.Text strong>{numberText(value)}</Typography.Text>
      </Space>
      <Progress percent={ratio(value, total)} strokeColor={color} showInfo={false} />
    </div>
  )
}

export default function Dashboard() {
  const [stats, setStats] = useState<DashboardStats | null>(null)
  const [loading, setLoading] = useState(true)

  useEffect(() => {
    dashboardApi
      .stats()
      .then(setStats)
      .catch((e) => message.error(e.message))
      .finally(() => setLoading(false))
  }, [])

  if (loading) {
    return (
      <div style={{ textAlign: 'center', padding: 80 }}>
        <Spin size="large" />
      </div>
    )
  }

  return (
    <div>
      <Space style={{ width: '100%', justifyContent: 'space-between', marginBottom: 16 }} align="start">
        <div>
          <Typography.Title level={4} style={{ marginTop: 0, marginBottom: 4 }}>
            数据概览
          </Typography.Title>
          <Typography.Text type="secondary">
            {stats?.scope === 'platform' ? '平台全局运营数据' : '当前商户运营数据'}
          </Typography.Text>
        </div>
      </Space>

      <Row gutter={[16, 16]}>
        <Col xs={24} sm={12} lg={8}>
          <MetricCard
            title={stats?.scope === 'platform' ? '可售商品' : '商户商品'}
            value={stats?.active_product_count ?? 0}
            icon={<ShoppingOutlined />}
          />
        </Col>
        <Col xs={24} sm={12} lg={8}>
          <MetricCard
            title={stats?.scope === 'platform' ? '启用商户' : '当前商户'}
            value={stats?.active_merchant_count ?? 0}
            icon={<ShopOutlined />}
          />
        </Col>
        <Col xs={24} sm={12} lg={8}>
          <MetricCard title="成员账号" value={stats?.user_count ?? 0} icon={<TeamOutlined />} />
        </Col>
        <Col xs={24} sm={12} lg={8}>
          <MetricCard title="订单总数" value={stats?.order_count ?? 0} icon={<DatabaseOutlined />} />
        </Col>
        <Col xs={24} sm={12} lg={8}>
          <MetricCard title="今日订单" value={stats?.today_order_count ?? 0} icon={<ClockCircleOutlined />} />
        </Col>
        <Col xs={24} sm={12} lg={8}>
          <MetricCard
            title="待发货订单"
            value={stats?.paid_order_count ?? 0}
            icon={<ClockCircleOutlined />}
            color={(stats?.paid_order_count ?? 0) > 0 ? '#cf1322' : undefined}
          />
        </Col>
      </Row>

      <Typography.Title level={5} style={{ marginTop: 24 }}>
        积分与费用
      </Typography.Title>
      <Row gutter={[16, 16]}>
        <Col xs={24} sm={12} lg={6}>
          <MetricCard title="成交积分" value={stats?.total_sales ?? 0} icon={<DollarOutlined />} suffix="积分" />
        </Col>
        <Col xs={24} sm={12} lg={6}>
          <MetricCard title="今日成交" value={stats?.today_sales ?? 0} icon={<DollarOutlined />} suffix="积分" />
        </Col>
        <Col xs={24} sm={12} lg={6}>
          <MetricCard title="平台手续费" value={stats?.total_fees ?? 0} icon={<PercentageOutlined />} suffix="积分" />
        </Col>
        <Col xs={24} sm={12} lg={6}>
          <MetricCard title="可用余额" value={stats?.wallet_available_balance ?? 0} icon={<WalletOutlined />} suffix="积分" />
        </Col>
      </Row>

      <Row gutter={[16, 16]} style={{ marginTop: 16 }}>
        <Col xs={24} lg={14}>
          <Card title="订单状态">
            <Space direction="vertical" size="middle" style={{ width: '100%' }}>
              <StatusLine
                label="待发货"
                value={stats?.paid_order_count ?? 0}
                total={stats?.order_count ?? 0}
                color="#1677ff"
              />
              <StatusLine
                label="发货中"
                value={stats?.delivering_order_count ?? 0}
                total={stats?.order_count ?? 0}
                color="#13c2c2"
              />
              <StatusLine
                label="已交付"
                value={stats?.delivered_order_count ?? 0}
                total={stats?.order_count ?? 0}
                color="#52c41a"
              />
              <StatusLine
                label="发货失败"
                value={stats?.ship_failed_order_count ?? 0}
                total={stats?.order_count ?? 0}
                color="#ff4d4f"
              />
              <StatusLine
                label="已取消"
                value={stats?.cancelled_order_count ?? 0}
                total={stats?.order_count ?? 0}
                color="#8c8c8c"
              />
            </Space>
          </Card>
        </Col>
        <Col xs={24} lg={10}>
          <Card title="接口与回调">
            <Row gutter={[16, 16]}>
              <Col span={12}>
                <Statistic
                  title="API 密钥"
                  value={stats?.active_api_client_count ?? 0}
                  prefix={<ApiOutlined />}
                  suffix={`/ ${numberText(stats?.api_client_count)}`}
                />
              </Col>
              <Col span={12}>
                <Statistic title="回调订阅" value={stats?.callback_subscription_count ?? 0} prefix={<CheckCircleOutlined />} />
              </Col>
              <Col span={12}>
                <Statistic title="待投递回调" value={stats?.pending_callback_count ?? 0} prefix={<ClockCircleOutlined />} />
              </Col>
              <Col span={12}>
                <Statistic
                  title="失败回调"
                  value={stats?.failed_callback_count ?? 0}
                  prefix={<CloseCircleOutlined />}
                  valueStyle={(stats?.failed_callback_count ?? 0) > 0 ? { color: '#cf1322' } : undefined}
                />
              </Col>
            </Row>
          </Card>
        </Col>
      </Row>
    </div>
  )
}