import { useEffect, useState, useCallback } from 'react';
import {
  Table,
  Button,
  Space,
  Modal,
  Form,
  Input,
  InputNumber,
  Select,
  Popconfirm,
  message,
  Typography,
} from 'antd';
import { PlusOutlined, NumberOutlined } from '@ant-design/icons';
import {
  listNumberingRules,
  createNumberingRule,
  updateNumberingRule,
  deleteNumberingRule,
  generateNumber,
  type NumberingRuleInfo,
  type CreateNumberingRuleRequest,
  type UpdateNumberingRuleRequest,
} from '../../api/numberingRules';

// --- Types ---

type NumberingRule = NumberingRuleInfo;

// --- Constants ---

const resetCycleOptions = [
  { label: '不重置', value: 'never' },
  { label: '每天', value: 'daily' },
  { label: '每月', value: 'monthly' },
  { label: '每年', value: 'yearly' },
];

const resetCycleLabels: Record<string, string> = {
  never: '不重置',
  daily: '每天',
  monthly: '每月',
  yearly: '每年',
};

// --- Component ---

export default function NumberingRules() {
  const [rules, setRules] = useState<NumberingRule[]>([]);
  const [loading, setLoading] = useState(false);
  const [modalOpen, setModalOpen] = useState(false);
  const [editRule, setEditRule] = useState<NumberingRule | null>(null);
  const [form] = Form.useForm();

  const fetchRules = useCallback(async () => {
    setLoading(true);
    try {
      const result = await listNumberingRules();
      setRules(Array.isArray(result) ? result : result.data ?? []);
    } catch {
      message.error('加载编号规则失败');
    }
    setLoading(false);
  }, []);

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

  const handleSubmit = async (values: CreateNumberingRuleRequest) => {
    try {
      if (editRule) {
        await updateNumberingRule(editRule.id, values as UpdateNumberingRuleRequest);
        message.success('编号规则更新成功');
      } else {
        await createNumberingRule(values);
        message.success('编号规则创建成功');
      }
      closeModal();
      fetchRules();
    } catch (err: unknown) {
      const errorMsg =
        (err as { response?: { data?: { message?: string } } })?.response?.data
          ?.message || '操作失败';
      message.error(errorMsg);
    }
  };

  const handleDelete = async (id: string) => {
    try {
      await deleteNumberingRule(id);
      message.success('编号规则已删除');
      fetchRules();
    } catch {
      message.error('删除失败');
    }
  };

  const handleGenerate = async (rule: NumberingRule) => {
    try {
      const result = await generateNumber(rule.id);
      message.success(`生成编号: ${result.number}`);
    } catch (err: unknown) {
      const errorMsg =
        (err as { response?: { data?: { message?: string } } })?.response?.data
          ?.message || '生成编号失败';
      message.error(errorMsg);
    }
  };

  const openCreate = () => {
    setEditRule(null);
    form.resetFields();
    form.setFieldsValue({
      seq_length: 4,
      seq_start: 1,
      separator: '-',
      reset_cycle: 'never',
    });
    setModalOpen(true);
  };

  const openEdit = (rule: NumberingRule) => {
    setEditRule(rule);
    form.setFieldsValue({
      name: rule.name,
      code: rule.code,
      prefix: rule.prefix,
      date_format: rule.date_format,
      seq_length: rule.seq_length,
      seq_start: rule.seq_start,
      separator: rule.separator,
      reset_cycle: rule.reset_cycle,
    });
    setModalOpen(true);
  };

  const closeModal = () => {
    setModalOpen(false);
    setEditRule(null);
    form.resetFields();
  };

  const columns = [
    { title: '名称', dataIndex: 'name', key: 'name' },
    { title: '编码', dataIndex: 'code', key: 'code' },
    {
      title: '前缀',
      dataIndex: 'prefix',
      key: 'prefix',
      render: (v?: string) => v || '-',
    },
    {
      title: '日期格式',
      dataIndex: 'date_format',
      key: 'date_format',
      render: (v?: string) => v || '-',
    },
    {
      title: '序列长度',
      dataIndex: 'seq_length',
      key: 'seq_length',
      width: 90,
    },
    {
      title: '当前值',
      dataIndex: 'current_value',
      key: 'current_value',
      width: 90,
    },
    {
      title: '重置周期',
      dataIndex: 'reset_cycle',
      key: 'reset_cycle',
      width: 100,
      render: (v: string) => resetCycleLabels[v] ?? v,
    },
    {
      title: '操作',
      key: 'actions',
      render: (_: unknown, record: NumberingRule) => (
        <Space>
          <Button
            size="small"
            icon={<NumberOutlined />}
            onClick={() => handleGenerate(record)}
          >
            生成编号
          </Button>
          <Button size="small" onClick={() => openEdit(record)}>
            编辑
          </Button>
          <Popconfirm
            title="确定删除此编号规则？"
            onConfirm={() => handleDelete(record.id)}
          >
            <Button size="small" danger>
              删除
            </Button>
          </Popconfirm>
        </Space>
      ),
    },
  ];

  return (
    <div>
      <div
        style={{
          display: 'flex',
          justifyContent: 'space-between',
          marginBottom: 16,
        }}
      >
        <Typography.Title level={5} style={{ margin: 0 }}>
          编号规则管理
        </Typography.Title>
        <Button type="primary" icon={<PlusOutlined />} onClick={openCreate}>
          新建规则
        </Button>
      </div>

      <Table
        columns={columns}
        dataSource={rules}
        rowKey="id"
        loading={loading}
        pagination={{ pageSize: 20 }}
      />

      <Modal
        title={editRule ? '编辑编号规则' : '新建编号规则'}
        open={modalOpen}
        onCancel={closeModal}
        onOk={() => form.submit()}
        width={560}
      >
        <Form form={form} onFinish={handleSubmit} layout="vertical">
          <Form.Item
            name="name"
            label="名称"
            rules={[{ required: true, message: '请输入规则名称' }]}
          >
            <Input />
          </Form.Item>
          <Form.Item
            name="code"
            label="编码"
            rules={[{ required: true, message: '请输入规则编码' }]}
          >
            <Input disabled={!!editRule} />
          </Form.Item>
          <Form.Item name="prefix" label="前缀">
            <Input placeholder="如 PO、SO" />
          </Form.Item>
          <Form.Item name="date_format" label="日期格式">
            <Input placeholder="如 YYYYMMDD" />
          </Form.Item>
          <Form.Item name="separator" label="分隔符">
            <Input placeholder="默认 -" />
          </Form.Item>
          <Form.Item
            name="seq_length"
            label="序列长度"
            rules={[{ required: true, message: '请输入序列长度' }]}
          >
            <InputNumber min={1} max={20} style={{ width: '100%' }} />
          </Form.Item>
          <Form.Item name="seq_start" label="起始值" initialValue={1}>
            <InputNumber min={1} style={{ width: '100%' }} />
          </Form.Item>
          <Form.Item
            name="reset_cycle"
            label="重置周期"
            rules={[{ required: true, message: '请选择重置周期' }]}
          >
            <Select options={resetCycleOptions} />
          </Form.Item>
        </Form>
      </Modal>
    </div>
  );
}