import React, { useEffect, useState, useCallback } from 'react';
import {
  Button, Card, DatePicker, Input, message, Select, Space, Table, Tag, Typography,
} from 'antd';
import {
  TableOutlined, ReloadOutlined, SearchOutlined, ExportOutlined,
} from '@ant-design/icons';
import { getApiUsageAll } from '../api';
import dayjs from 'dayjs';

interface UsageItem {
  id: string;
  apiKeyId: string;
  companyName: string;
  apiKeyPrefix: string | null;
  taskId: string | null;
  requestType: string;
  modelName: string;
  genType: string;
  creditsCost: number;
  tokensUsed: number;
  requestDurationMs: number;
  duration: number | null;
  resolution: string | null;
  status: string;
  errorMessage: string | null;
  errorCode: string | null;
  createdAt: string | null;
}

const AdminApiUsage: React.FC = () => {
  const [items, setItems] = useState<UsageItem[]>([]);
  const [loading, setLoading] = useState(false);
  const [total, setTotal] = useState(0);
  const [page, setPage] = useState(1);
  const [pageSize, setPageSize] = useState(50);
  const [searchText, setSearchText] = useState('');
  const [filterGenType, setFilterGenType] = useState<string | undefined>(undefined);
  const [filterStatus, setFilterStatus] = useState<string | undefined>(undefined);
  const [dateRange, setDateRange] = useState<[dayjs.Dayjs | null, dayjs.Dayjs | null]>([null, null]);

  const load = useCallback(async () => {
    setLoading(true);
    try {
      const params: any = {
        skip: (page - 1) * pageSize,
        limit: pageSize,
      };
      if (filterGenType) params.genType = filterGenType;
      if (filterStatus) params.status = filterStatus;
      if (dateRange[0]) params.startDate = dateRange[0].startOf('day').toISOString();
      if (dateRange[1]) params.endDate = dateRange[1].endOf('day').toISOString();
      if (searchText.trim()) params.search = searchText.trim();

      const data = await getApiUsageAll(params);
      setItems(data?.items || []);
      setTotal(data?.total || 0);
    } catch {
      message.error('加载失败');
    } finally {
      setLoading(false);
    }
  }, [page, pageSize, filterGenType, filterStatus, dateRange, searchText]);

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

  const handleSearch = () => {
    setPage(1);
    load();
  };

  // 导出 CSV
  const handleExport = () => {
    const headers = ['时间', '公司', 'api-key', '类型', '模型', '时长(秒)', '分辨率', '消耗(元)', 'Token', '耗时(ms)', '状态', '错误信息'];
    const rows = items.map(item => [
      item.createdAt ? new Date(item.createdAt).toLocaleString() : '',
      item.companyName || '',
      item.apiKeyPrefix || '',
      item.genType === 'video' ? '视频' : '图片',
      item.modelName || '',
      item.duration || '',
      item.resolution || '',
      (item.creditsCost || 0).toFixed(2),
      item.tokensUsed || '',
      item.requestDurationMs || '',
      item.status === 'success' ? '成功' : '失败',
      item.errorMessage || '',
    ]);

    const csvContent = [headers, ...rows]
      .map(row => row.map(cell => `"${String(cell).replace(/"/g, '""')}"`).join(','))
      .join('\n');

    const BOM = '';
    const blob = new Blob([BOM + csvContent], { type: 'text/csv;charset=utf-8;' });
    const url = URL.createObjectURL(blob);
    const link = document.createElement('a');
    link.href = url;
    link.download = `api_usage_${dayjs().format('YYYYMMDD_HHmmss')}.csv`;
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
    URL.revokeObjectURL(url);
    message.success('导出成功');
  };

  const columns = [
    {
      title: '时间',
      dataIndex: 'createdAt',
      width: 160,
      render: (v: string) => v ? new Date(v).toLocaleString() : '-',
    },
    {
      title: '公司',
      dataIndex: 'companyName',
      width: 120,
      render: (v: string) => v || '-',
    },
    {
      title: 'api-key',
      dataIndex: 'apiKeyPrefix',
      width: 110,
      render: (v: string) => v ? <code style={{ background: '#f5f5f5', padding: '2px 6px', borderRadius: 4 }}>{v}</code> : '-',
    },
    {
      title: '类型',
      dataIndex: 'genType',
      width: 70,
      render: (v: string) => <Tag color={v === 'video' ? 'blue' : 'green'}>{v === 'video' ? '视频' : '图片'}</Tag>,
    },
    {
      title: '模型',
      dataIndex: 'modelName',
      width: 160,
      ellipsis: true,
    },
    {
      title: '消耗(元)',
      dataIndex: 'creditsCost',
      width: 90,
      render: (v: number) => <span style={{ color: v > 0 ? '#f5222d' : '#52c41a', fontWeight: 500 }}>{v?.toFixed(2) || '0.00'}</span>,
    },
    {
      title: 'Token',
      dataIndex: 'tokensUsed',
      width: 80,
      render: (v: number) => v || '-',
    },
    {
      title: '耗时(ms)',
      dataIndex: 'requestDurationMs',
      width: 90,
      render: (v: number) => v || '-',
    },
    {
      title: '状态',
      dataIndex: 'status',
      width: 80,
      render: (v: string) => <Tag color={v === 'success' ? 'green' : 'red'}>{v === 'success' ? '成功' : '失败'}</Tag>,
    },
    {
      title: '错误信息',
      dataIndex: 'errorMessage',
      width: 200,
      ellipsis: true,
      render: (v: string) => v ? <span style={{ color: '#f5222d' }}>{v}</span> : '-',
    },
  ];

  // 统计
  const totalCost = items.reduce((sum, item) => sum + (item.creditsCost || 0), 0);
  const successCount = items.filter(i => i.status === 'success').length;
  const failedCount = items.filter(i => i.status === 'failed').length;

  return (
    <Space direction="vertical" size="large" style={{ width: '100%' }}>
      <Card variant="outlined" style={{ borderRadius: 12, border: '1px solid #f0f0f5' }}>
        <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
          <Space>
            <div style={{ width: 36, height: 36, borderRadius: 8, background: 'linear-gradient(135deg, #6366f1, #8b5cf6)', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
              <TableOutlined style={{ color: '#fff', fontSize: 18 }} />
            </div>
            <Typography.Text strong style={{ fontSize: 16 }}>API 消耗列表</Typography.Text>
            <Tag color="purple">{total} 条</Tag>
          </Space>
          <Space>
            <Tag color="blue">本页消耗: {totalCost.toFixed(2)} 元</Tag>
            <Tag color="green">成功: {successCount}</Tag>
            <Tag color="red">失败: {failedCount}</Tag>
            <Button icon={<ExportOutlined />} onClick={handleExport}>导出</Button>
            <Button icon={<ReloadOutlined />} onClick={handleSearch}>刷新</Button>
          </Space>
        </div>
      </Card>

      {/* 筛选栏 */}
      <Card variant="outlined" style={{ borderRadius: 12 }}>
        <div style={{ display: 'flex', gap: 12, flexWrap: 'wrap', alignItems: 'center' }}>
          <Input
            placeholder="搜索公司名或 Key 前缀"
            prefix={<SearchOutlined />}
            value={searchText}
            onChange={e => setSearchText(e.target.value)}
            onPressEnter={handleSearch}
            allowClear
            style={{ width: 220 }}
          />
          <Select
            placeholder="类型"
            value={filterGenType}
            onChange={v => { setFilterGenType(v); setPage(1); }}
            allowClear
            style={{ width: 100 }}
          >
            <Select.Option value="video">视频</Select.Option>
            <Select.Option value="image">图片</Select.Option>
          </Select>
          <Select
            placeholder="状态"
            value={filterStatus}
            onChange={v => { setFilterStatus(v); setPage(1); }}
            allowClear
            style={{ width: 100 }}
          >
            <Select.Option value="success">成功</Select.Option>
            <Select.Option value="failed">失败</Select.Option>
          </Select>
          <DatePicker.RangePicker
            value={dateRange}
            onChange={(dates) => { setDateRange(dates as [dayjs.Dayjs | null, dayjs.Dayjs | null]); setPage(1); }}
          />
          <Button type="primary" onClick={handleSearch}>筛选</Button>
        </div>
      </Card>

      <Card variant="outlined" style={{ borderRadius: 12 }}>
        <Table
          columns={columns}
          dataSource={items}
          rowKey="id"
          loading={loading}
          pagination={{
            current: page,
            pageSize,
            total,
            onChange: (p, ps) => { setPage(p); setPageSize(ps || 50); },
            showSizeChanger: true,
            showTotal: (t) => `共 ${t} 条`,
          }}
          scroll={{ x: 1300 }}
        />
      </Card>
    </Space>
  );
};

export default AdminApiUsage;