import React, { useState } from 'react';
import { useNavigate } from 'react-router-dom';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import {
  Card,
  Table,
  Button,
  Tag,
  Space,
  Input,
  Typography,
  Modal,
  Form,
  Row,
  Col,
  Statistic,
  message,
} from 'antd';
import {
  PlusOutlined,
  SearchOutlined,
  FolderOpenOutlined,
  ClockCircleOutlined,
  CheckCircleOutlined,
  ExclamationCircleOutlined,
} from '@ant-design/icons';
import type { ColumnsType } from 'antd/es/table';
import type { CaseRecord, CaseStatus } from '../../types';
import { fetchCases, createCase } from '../../services/api';

const statusConfig: Record<CaseStatus, { color: string; label: string }> = {
  pending: { color: 'default', label: '待处理' },
  uploading: { color: 'processing', label: '上传中' },
  analyzing: { color: 'blue', label: '分析中' },
  reviewing: { color: 'orange', label: '待复核' },
  completed: { color: 'green', label: '已完成' },
};

const CaseList: React.FC = () => {
  const navigate = useNavigate();
  const qc = useQueryClient();
  const [createOpen, setCreateOpen] = useState(false);
  const [form] = Form.useForm();
  const [search, setSearch] = useState('');

  const { data, isLoading } = useQuery({
    queryKey: ['cases', search],
    queryFn: () => fetchCases({ search: search || undefined }),
  });

  const cases = data?.items ?? [];

  const createMutation = useMutation({
    mutationFn: createCase,
    onSuccess: () => {
      message.success('案件创建成功');
      qc.invalidateQueries({ queryKey: ['cases'] });
      setCreateOpen(false);
      form.resetFields();
    },
  });

  const totalCases = cases.length;
  const pendingReview = cases.filter((c) => c.status === 'reviewing').length;
  const completedCount = cases.filter((c) => c.status === 'completed').length;
  const analyzingCount = cases.filter(
    (c) => c.status === 'analyzing' || c.status === 'uploading',
  ).length;

  const columns: ColumnsType<CaseRecord> = [
    {
      title: '案件编号',
      dataIndex: 'caseNo',
      width: 180,
      render: (text, record) => (
        <a onClick={() => navigate(`/cases/${record.id}/workspace`)}>{text}</a>
      ),
    },
    { title: '案件名称', dataIndex: 'title', ellipsis: true },
    { title: '受害人', dataIndex: 'victimName', width: 100 },
    { title: '承办人', dataIndex: 'handler', width: 100 },
    {
      title: '状态',
      dataIndex: 'status',
      width: 100,
      render: (s: CaseStatus) => (
        <Tag color={statusConfig[s].color}>{statusConfig[s].label}</Tag>
      ),
    },
    {
      title: '截图数',
      dataIndex: 'imageCount',
      width: 80,
      align: 'center',
    },
    {
      title: '识别金额(元)',
      dataIndex: 'totalAmount',
      width: 140,
      align: 'right',
      render: (v: number) =>
        v > 0 ? (
          <Typography.Text strong style={{ color: '#cf1322' }}>
            ¥{v.toLocaleString('zh-CN', { minimumFractionDigits: 2 })}
          </Typography.Text>
        ) : (
          <Typography.Text type="secondary">-</Typography.Text>
        ),
    },
    {
      title: '更新时间',
      dataIndex: 'updatedAt',
      width: 170,
    },
    {
      title: '操作',
      width: 160,
      render: (_, record) => (
        <Space>
          <Button
            type="default"
            size="small"
            style={{
              background: '#e6f4ff',
              borderColor: '#91caff',
              color: '#0958d9',
              fontWeight: 600,
              boxShadow: '0 1px 2px rgba(22, 119, 255, 0.12)',
            }}
            onClick={() => navigate(`/cases/${record.id}/workspace`)}
          >
            进入工作台
          </Button>
        </Space>
      ),
    },
  ];

  return (
    <div>
      <Row gutter={16} style={{ marginBottom: 24 }}>
        <Col span={6}>
          <Card variant="borderless">
            <Statistic
              title="全部案件"
              value={totalCases}
              prefix={<FolderOpenOutlined />}
            />
          </Card>
        </Col>
        <Col span={6}>
          <Card variant="borderless">
            <Statistic
              title="处理中"
              value={analyzingCount}
              prefix={<ClockCircleOutlined />}
              valueStyle={{ color: '#1677ff' }}
            />
          </Card>
        </Col>
        <Col span={6}>
          <Card variant="borderless">
            <Statistic
              title="待复核"
              value={pendingReview}
              prefix={<ExclamationCircleOutlined />}
              valueStyle={{ color: '#fa8c16' }}
            />
          </Card>
        </Col>
        <Col span={6}>
          <Card variant="borderless">
            <Statistic
              title="已完成"
              value={completedCount}
              prefix={<CheckCircleOutlined />}
              valueStyle={{ color: '#52c41a' }}
            />
          </Card>
        </Col>
      </Row>

      <Card
        title="案件列表"
        extra={
          <Space>
            <Input
              placeholder="搜索案件编号、名称"
              prefix={<SearchOutlined />}
              style={{ width: 240 }}
              allowClear
              onPressEnter={(e) => setSearch((e.target as HTMLInputElement).value)}
              onChange={(e) => !e.target.value && setSearch('')}
            />
            <Button
              type="primary"
              icon={<PlusOutlined />}
              onClick={() => setCreateOpen(true)}
            >
              新建案件
            </Button>
          </Space>
        }
      >
        <Table
          rowKey="id"
          columns={columns}
          dataSource={cases}
          loading={isLoading}
          pagination={{ pageSize: 10, showSizeChanger: true, showTotal: (t) => `共 ${t} 条` }}
        />
      </Card>

      <Modal
        title="新建案件"
        open={createOpen}
        onCancel={() => setCreateOpen(false)}
        onOk={() => {
          form.validateFields().then((values) => createMutation.mutate(values));
        }}
        confirmLoading={createMutation.isPending}
        okText="创建"
        cancelText="取消"
        destroyOnClose
      >
        <Form form={form} layout="vertical" style={{ marginTop: 16 }}>
          <Form.Item
            label="案件编号"
            name="caseNo"
            rules={[{ required: true, message: '请输入案件编号' }]}
          >
            <Input placeholder="如：ZA-2026-001XXX" />
          </Form.Item>
          <Form.Item
            label="案件名称"
            name="title"
            rules={[{ required: true, message: '请输入案件名称' }]}
          >
            <Input placeholder="如：张某被电信诈骗案" />
          </Form.Item>
          <Row gutter={16}>
            <Col span={12}>
              <Form.Item
                label="受害人姓名"
                name="victimName"
                rules={[{ required: true, message: '请输入受害人姓名' }]}
              >
                <Input />
              </Form.Item>
            </Col>
            <Col span={12}>
              <Form.Item label="承办人" name="handler">
                <Input />
              </Form.Item>
            </Col>
          </Row>
        </Form>
      </Modal>
    </div>
  );
};

export default CaseList;