import { useEffect, useState } from 'react';
import {
  Button,
  Card,
  Form,
  Image,
  Input,
  Modal,
  Pagination,
  Space,
  Table,
  Tag,
  Upload,
  message,
} from 'antd';
import {
  DeleteOutlined,
  EyeOutlined,
  LinkOutlined,
  PlusOutlined,
  QrcodeOutlined,
  StopOutlined,
  UploadOutlined,
} from '@ant-design/icons';
import type { UploadFile } from 'antd';
import { productTracesApi } from '@/services/api';
import type { CreateProductTraceRequest, ProductTrace, UpdateProductTraceRequest } from '@/types';

type ProductTraceFormValues = Omit<CreateProductTraceRequest, 'manufactureDate'> & {
  manufactureDate: string;
};

function formatDate(value: string) {
  if (!value) return '-';
  return new Date(value).toLocaleDateString('zh-CN');
}

function toDateInputValue(value: string) {
  if (!value) return '';
  return new Date(value).toISOString().slice(0, 10);
}

function dateInputToISOString(value: string) {
  return new Date(`${value}T00:00:00+08:00`).toISOString();
}

function ProductTracesPage() {
  const [traces, setTraces] = useState<ProductTrace[]>([]);
  const [loading, setLoading] = useState(true);
  const [page, setPage] = useState(1);
  const [limit, setLimit] = useState(10);
  const [total, setTotal] = useState(0);
  const [search, setSearch] = useState('');

  const [modalOpen, setModalOpen] = useState(false);
  const [editingTrace, setEditingTrace] = useState<ProductTrace | null>(null);
  const [saving, setSaving] = useState(false);
  const [wechatFile, setWechatFile] = useState<File | null>(null);
  const [fileList, setFileList] = useState<UploadFile[]>([]);
  const [form] = Form.useForm<ProductTraceFormValues>();

  const [qrModalOpen, setQrModalOpen] = useState(false);
  const [qrCodeDataUrl, setQrCodeDataUrl] = useState('');
  const [qrUrl, setQrUrl] = useState('');
  const [selectedSerialNumber, setSelectedSerialNumber] = useState('');

  const loadTraces = async () => {
    setLoading(true);
    try {
      const result = await productTracesApi.list({
        page,
        limit,
        search: search || undefined,
      });
      setTraces(result.data || []);
      setTotal(result.pagination?.total || 0);
    } catch (err: any) {
      message.error(err?.response?.data?.message || err.message || '加载产品溯源失败');
      setTraces([]);
      setTotal(0);
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    loadTraces();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [page, limit, search]);

  const resetFormState = () => {
    form.resetFields();
    setEditingTrace(null);
    setWechatFile(null);
    setFileList([]);
  };

  const openCreate = () => {
    resetFormState();
    setModalOpen(true);
  };

  const openEdit = (trace: ProductTrace) => {
    setEditingTrace(trace);
    setWechatFile(null);
    setFileList([]);
    form.setFieldsValue({
      companyName: trace.companyName,
      companyAddress: trace.companyAddress,
      companyPhone: trace.companyPhone,
      deviceInfo: trace.deviceInfo,
      warrantyPeriod: trace.warrantyPeriod,
      manufactureDate: toDateInputValue(trace.manufactureDate),
      serialNumber: trace.serialNumber,
      officialWebsite: trace.officialWebsite,
    });
    setModalOpen(true);
  };

  const uploadWechatQrCodeIfNeeded = async (serialNumber: string) => {
    if (!wechatFile) return undefined;
    return productTracesApi.uploadWechatQrCode(serialNumber, wechatFile);
  };

  const handleSave = async (values: ProductTraceFormValues) => {
    setSaving(true);
    try {
      let saved: ProductTrace;
      if (editingTrace) {
        const payload: UpdateProductTraceRequest = {
          companyName: values.companyName,
          companyAddress: values.companyAddress,
          companyPhone: values.companyPhone,
          deviceInfo: values.deviceInfo,
          warrantyPeriod: values.warrantyPeriod,
          manufactureDate: dateInputToISOString(values.manufactureDate),
          officialWebsite: values.officialWebsite || '',
        };
        saved = await productTracesApi.update(editingTrace.serialNumber, payload);
      } else {
        const payload: CreateProductTraceRequest = {
          ...values,
          officialWebsite: values.officialWebsite || '',
          serialNumber: values.serialNumber.trim(),
          manufactureDate: dateInputToISOString(values.manufactureDate),
        };
        saved = await productTracesApi.create(payload);
      }

      const uploaded = await uploadWechatQrCodeIfNeeded(saved.serialNumber);
      if (uploaded) {
        saved = uploaded;
      }

      message.success(editingTrace ? '保存成功' : `创建成功：${saved.serialNumber}`);
      setModalOpen(false);
      resetFormState();
      loadTraces();
    } catch (err: any) {
      message.error(err?.response?.data?.message || err.message || '保存失败');
    } finally {
      setSaving(false);
    }
  };

  const handleGenerateQrCode = async (trace: ProductTrace) => {
    try {
      const result = await productTracesApi.generateQrCode(trace.serialNumber);
      setQrCodeDataUrl(result.qrCodeData);
      setQrUrl(result.queryUrl);
      setSelectedSerialNumber(trace.serialNumber);
      setQrModalOpen(true);
    } catch (err: any) {
      message.error(err?.response?.data?.message || err.message || '生成二维码失败');
    }
  };

  const handleDownloadQrCode = () => {
    if (!qrCodeDataUrl || !selectedSerialNumber) return;
    const link = document.createElement('a');
    link.download = `${selectedSerialNumber}.png`;
    link.href = qrCodeDataUrl;
    link.click();
  };

  const handleRevoke = (trace: ProductTrace) => {
    Modal.confirm({
      title: '停用产品溯源',
      content: `确定要停用产品序列号 ${trace.serialNumber} 吗？`,
      okText: '停用',
      okType: 'danger',
      cancelText: '取消',
      onOk: async () => {
        try {
          await productTracesApi.revoke(trace.serialNumber);
          message.success('已停用');
          loadTraces();
        } catch (err: any) {
          message.error(err?.response?.data?.message || err.message || '停用失败');
        }
      },
    });
  };

  const handleDelete = (trace: ProductTrace) => {
    Modal.confirm({
      title: '删除产品溯源',
      content: `确定要删除产品序列号 ${trace.serialNumber} 吗？此操作不可恢复。`,
      okText: '删除',
      okType: 'danger',
      cancelText: '取消',
      onOk: async () => {
        try {
          await productTracesApi.delete(trace.serialNumber);
          message.success('删除成功');
          loadTraces();
        } catch (err: any) {
          message.error(err?.response?.data?.message || err.message || '删除失败');
        }
      },
    });
  };

  const columns = [
    {
      title: '产品序列号',
      dataIndex: 'serialNumber',
      key: 'serialNumber',
      width: 180,
      render: (value: string) => (
        <span style={{ fontFamily: 'monospace', color: '#165DFF' }}>{value}</span>
      ),
    },
    {
      title: '企业名称',
      dataIndex: 'companyName',
      key: 'companyName',
    },
    {
      title: '设备信息',
      dataIndex: 'deviceInfo',
      key: 'deviceInfo',
      ellipsis: true,
    },
    {
      title: '质保期',
      dataIndex: 'warrantyPeriod',
      key: 'warrantyPeriod',
      width: 140,
    },
    {
      title: '出厂日期',
      dataIndex: 'manufactureDate',
      key: 'manufactureDate',
      width: 140,
      render: (value: string) => formatDate(value),
    },
    {
      title: '状态',
      dataIndex: 'isActive',
      key: 'isActive',
      width: 90,
      render: (value: boolean) => <Tag color={value ? 'green' : 'red'}>{value ? '有效' : '停用'}</Tag>,
    },
    {
      title: '操作',
      key: 'actions',
      width: 260,
      render: (_: unknown, record: ProductTrace) => (
        <Space>
          <Button type="link" size="small" icon={<EyeOutlined />} onClick={() => openEdit(record)}>
            详情
          </Button>
          <Button
            type="link"
            size="small"
            icon={<QrcodeOutlined />}
            onClick={() => handleGenerateQrCode(record)}
          >
            二维码
          </Button>
          {record.isActive && (
            <Button type="link" size="small" danger icon={<StopOutlined />} onClick={() => handleRevoke(record)}>
              停用
            </Button>
          )}
          <Button type="link" size="small" danger icon={<DeleteOutlined />} onClick={() => handleDelete(record)}>
            删除
          </Button>
        </Space>
      ),
    },
  ];

  return (
    <div>
      <Card
        title={
          <Space>
            <QrcodeOutlined />
            <span>产品溯源</span>
          </Space>
        }
        extra={
          <Button type="primary" icon={<PlusOutlined />} onClick={openCreate}>
            新建产品溯源
          </Button>
        }
      >
        <Space style={{ marginBottom: 16, flexWrap: 'wrap' }}>
          <Input.Search
            placeholder="搜索企业/设备/产品序列号"
            allowClear
            style={{ width: 280 }}
            onSearch={(value) => {
              setPage(1);
              setSearch(value);
            }}
            onChange={(event) => {
              if (!event.target.value) {
                setPage(1);
                setSearch('');
              }
            }}
          />
        </Space>
        <Table columns={columns} dataSource={traces} rowKey="serialNumber" loading={loading} pagination={false} />
        <div style={{ marginTop: 16 }}>
          <Pagination
            current={page}
            pageSize={limit}
            total={total}
            showSizeChanger
            showTotal={(value) => `共计 ${value} 条记录`}
            onChange={(newPage, newLimit) => {
              setPage(newPage);
              setLimit(newLimit);
            }}
          />
        </div>
      </Card>

      <Modal
        title={editingTrace ? '产品溯源详情' : '新建产品溯源'}
        open={modalOpen}
        onCancel={() => {
          setModalOpen(false);
          resetFormState();
        }}
        footer={null}
        width={680}
      >
        <Form form={form} layout="vertical" onFinish={handleSave}>
          <Form.Item name="companyName" label="企业名称" rules={[{ required: true, message: '请输入企业名称' }]}>
            <Input />
          </Form.Item>
          <Form.Item name="companyAddress" label="地址" rules={[{ required: true, message: '请输入地址' }]}>
            <Input />
          </Form.Item>
          <Form.Item name="companyPhone" label="电话" rules={[{ required: true, message: '请输入电话' }]}>
            <Input />
          </Form.Item>
          <Form.Item name="deviceInfo" label="设备信息" rules={[{ required: true, message: '请输入设备信息' }]}>
            <Input.TextArea rows={3} />
          </Form.Item>
          <Form.Item name="warrantyPeriod" label="质保期" rules={[{ required: true, message: '请输入质保期' }]}>
            <Input placeholder="例如：1 年 / 2027-06-05 前" />
          </Form.Item>
          <Form.Item name="manufactureDate" label="出厂日期" rules={[{ required: true, message: '请选择出厂日期' }]}>
            <Input type="date" />
          </Form.Item>
          <Form.Item name="serialNumber" label="产品序列号" rules={[{ required: true, message: '请输入产品序列号' }]}>
            <Input disabled={Boolean(editingTrace)} />
          </Form.Item>
          <Form.Item name="officialWebsite" label="官网链接（可选）" rules={[{ type: 'url', message: '请输入有效链接' }]}>
            <Input prefix={<LinkOutlined />} placeholder="https://example.com" />
          </Form.Item>
          <Form.Item label="公众号二维码（可选）">
            <Upload
              accept="image/jpeg,image/png,image/webp,image/heic,image/heif"
              listType="picture-card"
              maxCount={1}
              fileList={fileList}
              beforeUpload={(file) => {
                setWechatFile(file);
                setFileList([file]);
                return false;
              }}
              onRemove={() => {
                setWechatFile(null);
                setFileList([]);
              }}
            >
              {fileList.length === 0 ? (
                <div>
                  <UploadOutlined />
                  <div style={{ marginTop: 8 }}>上传</div>
                </div>
              ) : null}
            </Upload>
            {editingTrace?.wechatQrCode && !wechatFile && (
              <Image src={editingTrace.wechatQrCode} alt="公众号二维码" width={96} height={96} />
            )}
          </Form.Item>
          <Form.Item>
            <Space style={{ width: '100%', justifyContent: 'flex-end' }}>
              <Button onClick={() => setModalOpen(false)}>取消</Button>
              <Button type="primary" htmlType="submit" loading={saving}>
                保存
              </Button>
            </Space>
          </Form.Item>
        </Form>
      </Modal>

      <Modal
        title="产品溯源二维码"
        open={qrModalOpen}
        onCancel={() => setQrModalOpen(false)}
        footer={[
          <Button key="download" onClick={handleDownloadQrCode}>
            下载二维码
          </Button>,
          <Button key="close" type="primary" onClick={() => setQrModalOpen(false)}>
            关闭
          </Button>,
        ]}
      >
        <div style={{ textAlign: 'center' }}>
          {qrCodeDataUrl && (
            <>
              <img src={qrCodeDataUrl} alt="产品溯源二维码" style={{ width: 220, height: 220 }} />
              <p style={{ marginTop: 12, fontFamily: 'monospace', color: '#165DFF', fontWeight: 700 }}>
                {selectedSerialNumber}
              </p>
              <p style={{ fontSize: 12, color: '#888', wordBreak: 'break-all' }}>{qrUrl}</p>
            </>
          )}
        </div>
      </Modal>
    </div>
  );
}

export default ProductTracesPage;