// ============================================================
// 仪表盘页面
// ============================================================

import { useQuery } from '@tanstack/react-query'
import { Card, Col, Row, Statistic, Table, Tag, Spin } from 'antd'
import {
  TeamOutlined,
  CloudServerOutlined,
  ApiOutlined,
  ThunderboltOutlined,
  ColumnWidthOutlined,
} from '@ant-design/icons'
import { statsService } from '@/services/stats'
import { logService } from '@/services/logs'
import { PageHeader } from '@/components/PageHeader'
import { ErrorState } from '@/components/ErrorState'
import { actionLabels, actionColors } from '@/constants/status'
import type { OperationLog } from '@/types'

export default function Dashboard() {
  const {
    data: stats,
    isLoading: statsLoading,
    error: statsError,
    refetch: refetchStats,
  } = useQuery({
    queryKey: ['dashboard-stats'],
    queryFn: ({ signal }) => statsService.dashboard(signal),
  })

  const { data: logsData, isLoading: logsLoading } = useQuery({
    queryKey: ['recent-logs'],
    queryFn: ({ signal }) => logService.list({ page: 1, page_size: 10 }, signal),
  })

  if (statsError) {
    return (
      <>
        <PageHeader title="仪表盘" description="系统概览与最近活动" />
        <ErrorState
          message={(statsError as Error).message}
          onRetry={() => refetchStats()}
        />
      </>
    )
  }

  const statCards = [
    { title: '总账号', value: stats?.total_accounts ?? 0, icon: <TeamOutlined />, color: '#863bff' },
    { title: '活跃服务商', value: stats?.active_providers ?? 0, icon: <CloudServerOutlined />, color: '#47bfff' },
    { title: '活跃模型', value: stats?.active_models ?? 0, icon: <ApiOutlined />, color: '#22c55e' },
    { title: '今日请求', value: stats?.tasks_today ?? 0, icon: <ThunderboltOutlined />, color: '#f59e0b' },
    {
      title: '今日 Token',
      value: (stats?.tokens_today_input ?? 0) + (stats?.tokens_today_output ?? 0),
      icon: <ColumnWidthOutlined />,
      color: '#ef4444',
    },
  ]

  const logColumns = [
    {
      title: '操作类型',
      dataIndex: 'action',
      key: 'action',
      width: 140,
      render: (action: string) => (
        <Tag color={actionColors[action] || 'default'}>
          {actionLabels[action] || action}
        </Tag>
      ),
    },
    {
      title: '目标类型',
      dataIndex: 'target_type',
      key: 'target_type',
      width: 100,
      render: (v: string | null) => v || '-',
    },
    {
      title: '时间',
      dataIndex: 'created_at',
      key: 'created_at',
      width: 180,
      render: (v: string) => new Date(v).toLocaleString('zh-CN'),
    },
  ]

  return (
    <div>
      <PageHeader title="仪表盘" description="系统概览与最近活动" />

      {/* Stat Cards */}
      <Row gutter={[16, 16]} className="mb-6">
        {statsLoading ? (
          <Col span={24}>
            <div className="flex justify-center py-8">
              <Spin size="large" />
            </div>
          </Col>
        ) : (
          statCards.map((card) => (
            <Col xs={24} sm={12} md={8} lg={4} key={card.title}>
              <Card
                className="hover:shadow-md transition-shadow duration-200"
                styles={{ body: { padding: '20px 24px' } }}
              >
                <Statistic
                  title={
                    <span className="text-neutral-500 dark:text-neutral-400 text-xs font-medium uppercase tracking-wide">
                      {card.title}
                    </span>
                  }
                  value={card.value}
                  valueStyle={{ fontSize: 28, fontWeight: 600, color: card.color }}
                  prefix={
                    <span style={{ color: card.color, marginRight: 4 }}>{card.icon}</span>
                  }
                />
              </Card>
            </Col>
          ))
        )}
      </Row>

      {/* Recent Logs */}
      <Card
        title={
          <span className="text-sm font-semibold text-neutral-700 dark:text-neutral-300">
            最近操作日志
          </span>
        }
        size="small"
        styles={{ body: { padding: 0 } }}
      >
        <Table<OperationLog>
          columns={logColumns}
          dataSource={logsData?.items ?? []}
          loading={logsLoading}
          rowKey="id"
          pagination={false}
          size="small"
        />
      </Card>
    </div>
  )
}