import React, { useState } from 'react';
import { useParams } from 'react-router-dom';
import { useQuery } from '@tanstack/react-query';
import {
  Card,
  Table,
  Tag,
  Typography,
  Space,
  Select,
  Tooltip,
  Badge,
  Drawer,
  Descriptions,
  Button,
  Alert,
  Row,
  Col,
  Statistic,
} from 'antd';
import {
  SwapOutlined,
  WarningOutlined,
  LinkOutlined,
  EyeOutlined,
  ArrowUpOutlined,
  ArrowDownOutlined,
} from '@ant-design/icons';
import type { ColumnsType } from 'antd/es/table';
import type { TransactionRecord, SourceApp } from '../../types';
import { fetchTransactions } from '../../services/api';

const appTag: Record<SourceApp, { label: string; color: string }> = {
  wechat: { label: '微信', color: 'green' },
  alipay: { label: '支付宝', color: 'blue' },
  bank: { label: '银行', color: 'purple' },
  digital_wallet: { label: '数字钱包', color: 'orange' },
  other: { label: '其他', color: 'default' },
};

const Transactions: React.FC = () => {
  const { id = '1' } = useParams();
  const [filterDuplicate, setFilterDuplicate] = useState<string>('all');
  const [detail, setDetail] = useState<TransactionRecord | null>(null);

  const { data: txData } = useQuery({
    queryKey: ['transactions', id],
    queryFn: () => fetchTransactions(id),
  });
  const allTransactions = txData?.items ?? [];

  const data =
    filterDuplicate === 'all'
      ? allTransactions
      : filterDuplicate === 'unique'
      ? allTransactions.filter((t) => !t.isDuplicate)
      : allTransactions.filter((t) => t.isDuplicate);

  const totalOut = allTransactions
    .filter((t) => t.direction === 'out' && !t.isDuplicate)
    .reduce((s, t) => s + t.amount, 0);
  const totalIn = allTransactions
    .filter((t) => t.direction === 'in' && !t.isDuplicate)
    .reduce((s, t) => s + t.amount, 0);
  const duplicateCount = allTransactions.filter((t) => t.isDuplicate).length;
  const transitCount = allTransactions.filter((t) => t.isTransit).length;

  const columns: ColumnsType<TransactionRecord> = [
    {
      title: '交易时间',
      dataIndex: 'tradeTime',
      width: 170,
      sorter: (a, b) => a.tradeTime.localeCompare(b.tradeTime),
      defaultSortOrder: 'ascend',
    },
    {
      title: '来源',
      dataIndex: 'sourceApp',
      width: 100,
      render: (app: SourceApp) => (
        <Tag color={appTag[app].color}>{appTag[app].label}</Tag>
      ),
    },
    {
      title: '金额(元)',
      dataIndex: 'amount',
      width: 140,
      align: 'right',
      render: (v: number, r) => (
        <Typography.Text
          strong
          style={{ color: r.direction === 'out' ? '#cf1322' : '#389e0d' }}
        >
          {r.direction === 'out' ? '-' : '+'}¥{v.toLocaleString('zh-CN', { minimumFractionDigits: 2 })}
        </Typography.Text>
      ),
    },
    {
      title: '方向',
      dataIndex: 'direction',
      width: 70,
      align: 'center',
      render: (d: string) =>
        d === 'out' ? (
          <ArrowUpOutlined style={{ color: '#cf1322' }} />
        ) : (
          <ArrowDownOutlined style={{ color: '#389e0d' }} />
        ),
    },
    {
      title: '对方',
      dataIndex: 'counterpartyName',
      ellipsis: true,
    },
    {
      title: '备注',
      dataIndex: 'remark',
      width: 120,
      ellipsis: true,
    },
    {
      title: '标记',
      width: 130,
      render: (_, r) => (
        <Space size={4}>
          {r.isDuplicate && (
            <Tooltip title="该笔为重复展示记录，已与其他截图中的同笔交易合并">
              <Tag color="red">重复</Tag>
            </Tooltip>
          )}
          {r.isTransit && (
            <Tooltip title="该笔为本人账户间中转，不直接计入被骗金额">
              <Tag color="orange">中转</Tag>
            </Tooltip>
          )}
          {!r.isDuplicate && !r.isTransit && (
            <Tag color="green">有效</Tag>
          )}
        </Space>
      ),
    },
    {
      title: '置信度',
      dataIndex: 'confidence',
      width: 80,
      align: 'center',
      render: (v: number) => (
        <Badge
          color={v >= 0.9 ? '#52c41a' : v >= 0.8 ? '#faad14' : '#ff4d4f'}
          text={`${(v * 100).toFixed(0)}%`}
        />
      ),
    },
    {
      title: '操作',
      width: 80,
      render: (_, r) => (
        <Button
          type="link"
          size="small"
          icon={<EyeOutlined />}
          onClick={() => setDetail(r)}
        >
          详情
        </Button>
      ),
    },
  ];

  return (
    <div>
      <Row gutter={16} style={{ marginBottom: 24 }}>
        <Col span={6}>
          <Card variant="borderless">
            <Statistic
              title="总支出(去重后)"
              value={totalOut}
              precision={2}
              prefix="¥"
              valueStyle={{ color: '#cf1322' }}
            />
          </Card>
        </Col>
        <Col span={6}>
          <Card variant="borderless">
            <Statistic
              title="总收入(去重后)"
              value={totalIn}
              precision={2}
              prefix="¥"
              valueStyle={{ color: '#389e0d' }}
            />
          </Card>
        </Col>
        <Col span={6}>
          <Card variant="borderless">
            <Statistic
              title="重复记录"
              value={duplicateCount}
              suffix="笔"
              valueStyle={{ color: '#cf1322' }}
              prefix={<WarningOutlined />}
            />
          </Card>
        </Col>
        <Col span={6}>
          <Card variant="borderless">
            <Statistic
              title="中转记录"
              value={transitCount}
              suffix="笔"
              valueStyle={{ color: '#fa8c16' }}
              prefix={<LinkOutlined />}
            />
          </Card>
        </Col>
      </Row>

      {duplicateCount > 0 && (
        <Alert
          message={`系统识别出 ${duplicateCount} 笔重复展示记录`}
          description={'同一笔交易可能在列表页、详情页、短信通知中多次出现。标记为「重复」的记录已被合并，不会重复计入金额汇总。'}
          type="info"
          showIcon
          closable
          style={{ marginBottom: 16 }}
        />
      )}

      <Card
        title={
          <Space>
            <SwapOutlined />
            <span>交易明细</span>
            <Tag>{allTransactions.length} 笔</Tag>
          </Space>
        }
        extra={
          <Select
            value={filterDuplicate}
            onChange={setFilterDuplicate}
            style={{ width: 160 }}
            options={[
              { label: '全部交易', value: 'all' },
              { label: '仅有效交易', value: 'unique' },
              { label: '仅重复交易', value: 'duplicate' },
            ]}
          />
        }
      >
        <Table
          rowKey="id"
          columns={columns}
          dataSource={data}
          pagination={false}
          rowClassName={(r) =>
            r.isDuplicate
              ? 'row-duplicate'
              : r.isTransit
              ? 'row-transit'
              : ''
          }
          size="middle"
        />
      </Card>

      <Drawer
        title="交易详情"
        placement="right"
        width={480}
        open={!!detail}
        onClose={() => setDetail(null)}
      >
        {detail && (
          <Descriptions column={1} bordered size="small">
            <Descriptions.Item label="交易时间">
              {detail.tradeTime}
            </Descriptions.Item>
            <Descriptions.Item label="来源APP">
              <Tag color={appTag[detail.sourceApp].color}>
                {appTag[detail.sourceApp].label}
              </Tag>
            </Descriptions.Item>
            <Descriptions.Item label="金额">
              <Typography.Text
                strong
                style={{
                  color: detail.direction === 'out' ? '#cf1322' : '#389e0d',
                }}
              >
                {detail.direction === 'out' ? '-' : '+'}¥
                {detail.amount.toLocaleString('zh-CN', { minimumFractionDigits: 2 })}
              </Typography.Text>
            </Descriptions.Item>
            <Descriptions.Item label="对方">
              {detail.counterpartyName}
            </Descriptions.Item>
            <Descriptions.Item label="对方账号">
              {detail.counterpartyAccount || '-'}
            </Descriptions.Item>
            <Descriptions.Item label="本方账户尾号">
              {detail.selfAccountTailNo || '-'}
            </Descriptions.Item>
            <Descriptions.Item label="订单号">
              {detail.orderNo}
            </Descriptions.Item>
            <Descriptions.Item label="备注">{detail.remark}</Descriptions.Item>
            <Descriptions.Item label="置信度">
              {(detail.confidence * 100).toFixed(0)}%
            </Descriptions.Item>
            <Descriptions.Item label="证据截图">
              <Button type="link" size="small" icon={<EyeOutlined />}>
                查看原图 ({detail.evidenceImageId})
              </Button>
            </Descriptions.Item>
            <Descriptions.Item label="归并簇">
              {detail.clusterId || '独立交易'}
            </Descriptions.Item>
            <Descriptions.Item label="标记">
              <Space>
                {detail.isDuplicate && <Tag color="red">重复</Tag>}
                {detail.isTransit && <Tag color="orange">中转</Tag>}
                {!detail.isDuplicate && !detail.isTransit && (
                  <Tag color="green">有效</Tag>
                )}
              </Space>
            </Descriptions.Item>
          </Descriptions>
        )}
      </Drawer>
    </div>
  );
};

export default Transactions;