import { useState } from 'react';
import {
  Button, Descriptions, Divider, Drawer, Form, Input, InputNumber, Modal, Select, Space,
  Table, Tag, Typography, message,
} from 'antd';
import { MinusCircleOutlined, PlusOutlined } from '@ant-design/icons';
import type { ColumnsType } from 'antd/es/table';
import { request } from '../lib/api';
import {
  AROMA_TYPE_LABELS, DETAIL_TEMPLATE_STATUS_LABELS, fmtTime,
} from '../lib/constants';
import { useAdminList } from '../lib/useAdminList';
import DetailImageUrlList from '../components/DetailImageUrlList';
import type { ProductDetailTemplateDto } from '../lib/product-detail-templates';
import { TEMPLATE_MAX_DETAIL_IMAGES } from '../lib/product-detail-templates';

type Row = ProductDetailTemplateDto;

type TemplateFormValues = {
  code: string;
  name: string;
  description?: string;
  aromaType?: string | null;
  storyTitle?: string;
  storyText?: string;
  features?: Array<{ icon?: string; title?: string; desc?: string }>;
  detailImageUrls?: string[];
  suggestedDetailImageCount?: number;
  sortOrder?: number;
  status?: string;
};

function mapToForm(d: Record<string, unknown>) {
  const row = d as Row;
  return {
    ...row,
    detailImageUrls: row.detailImageUrls?.length ? row.detailImageUrls : [''],
    features: row.features?.length
      ? row.features
      : [{ icon: 'star', title: '', desc: '' }],
  };
}

function buildPayload(v: TemplateFormValues) {
  const detailImageUrls = (v.detailImageUrls ?? []).map((u) => u?.trim()).filter(Boolean);
  const features = (v.features ?? [])
    .filter((f) => f?.title?.trim() || f?.desc?.trim())
    .map((f) => ({
      icon: f.icon?.trim() || 'star',
      title: f.title?.trim() ?? '',
      desc: f.desc?.trim() ?? '',
    }));
  return {
    code: v.code.trim(),
    name: v.name.trim(),
    description: v.description?.trim() || undefined,
    aromaType: v.aromaType || null,
    storyTitle: v.storyTitle?.trim() || undefined,
    storyText: v.storyText?.trim() || undefined,
    features,
    detailImageUrls,
    suggestedDetailImageCount: detailImageUrls.length || (v.suggestedDetailImageCount ?? 1),
    sortOrder: v.sortOrder ?? 0,
    status: v.status ?? 'ACTIVE',
  };
}

function TemplateContentFields() {
  return (
    <>
      <Typography.Text type="secondary">模板详情长图（套用商品时可逐张修改）</Typography.Text>
      <DetailImageUrlList
        label="详情图"
        bizType="DETAIL_TEMPLATE"
        maxCount={TEMPLATE_MAX_DETAIL_IMAGES}
      />
      <Divider />
      <Form.Item name="storyTitle" label="故事标题">
        <Input placeholder="如：千年杜康 · 唯有此处" />
      </Form.Item>
      <Form.Item name="storyText" label="故事正文">
        <Input.TextArea rows={4} placeholder="商品故事描述" />
      </Form.Item>
      <Typography.Text type="secondary">卖点特色</Typography.Text>
      <Form.List name="features">
        {(fields, { add, remove }) => (
          <>
            {fields.map((field) => (
              <Space key={field.key} direction="vertical" style={{ display: 'flex', marginBottom: 12, width: '100%' }}>
                <Space align="start">
                  <Form.Item {...field} name={[field.name, 'icon']} label="图标" style={{ marginBottom: 0 }}>
                    <Input placeholder="material icon 名" style={{ width: 140 }} />
                  </Form.Item>
                  <Form.Item {...field} name={[field.name, 'title']} label="标题" style={{ marginBottom: 0, flex: 1 }}>
                    <Input placeholder="标题" />
                  </Form.Item>
                  {fields.length > 1 && (
                    <MinusCircleOutlined onClick={() => remove(field.name)} style={{ marginTop: 30 }} />
                  )}
                </Space>
                <Form.Item {...field} name={[field.name, 'desc']} label="描述" style={{ marginBottom: 0 }}>
                  <Input placeholder="简短描述" />
                </Form.Item>
              </Space>
            ))}
            <Button type="dashed" onClick={() => add({ icon: 'star', title: '', desc: '' })} block icon={<PlusOutlined />}>
              添加卖点
            </Button>
          </>
        )}
      </Form.List>
    </>
  );
}

export default function ProductDetailTemplatesPage() {
  const [form] = Form.useForm();
  const [editForm] = Form.useForm();
  const [createForm] = Form.useForm();
  const [filters, setFilters] = useState<Record<string, string>>({});
  const { data, loading, page, pageSize, setPage, setPageSize, reload } = useAdminList<Row>(
    '/admin/product-detail-templates',
    () => {
      const qs = new URLSearchParams();
      if (filters.name) qs.set('name', filters.name);
      if (filters.code) qs.set('code', filters.code);
      if (filters.status) qs.set('status', filters.status);
      if (filters.aromaType) qs.set('aromaType', filters.aromaType);
      return qs;
    },
    [filters],
  );
  const [detail, setDetail] = useState<Record<string, unknown> | null>(null);
  const [drawerOpen, setDrawerOpen] = useState(false);
  const [createOpen, setCreateOpen] = useState(false);

  const columns: ColumnsType<Row> = [
    { title: '编码', dataIndex: 'code', width: 120 },
    { title: '名称', dataIndex: 'name', width: 120 },
    { title: '说明', dataIndex: 'description', width: 200, ellipsis: true },
    { title: '香型', dataIndex: 'aromaType', width: 90, render: (v) => (v ? AROMA_TYPE_LABELS[v] || v : '—') },
    { title: '详情图', dataIndex: 'detailImageUrls', width: 80, render: (v: string[] | undefined) => v?.length ?? 0 },
    { title: '排序', dataIndex: 'sortOrder', width: 60 },
    { title: '状态', dataIndex: 'status', width: 80, render: (s) => <Tag>{DETAIL_TEMPLATE_STATUS_LABELS[s] || s}</Tag> },
    { title: '更新', dataIndex: 'updatedAt', width: 160, render: fmtTime },
    {
      title: '操作', width: 80,
      render: (_, row) => (
        <Button type="link" size="small" onClick={async () => {
          const d = await request<Record<string, unknown>>(`/admin/product-detail-templates/${row.id}`);
          setDetail(d);
          editForm.setFieldsValue(mapToForm(d));
          setDrawerOpen(true);
        }}>编辑</Button>
      ),
    },
  ];

  return (
    <div>
      <Space style={{ marginBottom: 16, width: '100%', justifyContent: 'space-between' }}>
        <Typography.Title level={4} style={{ margin: 0 }}>商品详情模板</Typography.Title>
        <Button type="primary" onClick={() => setCreateOpen(true)}>新建模板</Button>
      </Space>
      <Form form={form} layout="inline" style={{ marginBottom: 16 }} onFinish={(v) => { setFilters(v); setPage(1); }}>
        <Form.Item name="name" label="名称"><Input allowClear /></Form.Item>
        <Form.Item name="code" label="编码"><Input allowClear /></Form.Item>
        <Form.Item name="status" label="状态">
          <Select allowClear style={{ width: 110 }} options={Object.entries(DETAIL_TEMPLATE_STATUS_LABELS).map(([value, label]) => ({ value, label }))} />
        </Form.Item>
        <Form.Item name="aromaType" label="香型">
          <Select allowClear style={{ width: 110 }} options={Object.entries(AROMA_TYPE_LABELS).map(([value, label]) => ({ value, label }))} />
        </Form.Item>
        <Form.Item><Button type="primary" htmlType="submit">查询</Button></Form.Item>
      </Form>
      <Table rowKey="id" className="admin-table-nowrap" loading={loading} columns={columns} dataSource={data?.items ?? []} scroll={{ x: 1100 }}
        pagination={{ current: page, pageSize, total: data?.total ?? 0, showSizeChanger: true, onChange: (p, ps) => { setPage(p); setPageSize(ps); } }} />
      <Drawer title="编辑详情模板" width={640} open={drawerOpen} onClose={() => setDrawerOpen(false)}
        extra={detail && (
          <Button type="primary" onClick={async () => {
            const v = await editForm.validateFields();
            const payload = buildPayload(v);
            await request(`/admin/product-detail-templates/${detail.id}`, { method: 'PUT', body: JSON.stringify(payload) });
            message.success('已保存');
            setDrawerOpen(false);
            void reload();
          }}>保存</Button>
        )}>
        {detail && (
          <>
            <Descriptions column={1} bordered size="small" style={{ marginBottom: 16 }}>
              <Descriptions.Item label="ID">{String(detail.id)}</Descriptions.Item>
              <Descriptions.Item label="创建">{fmtTime(String(detail.createdAt))}</Descriptions.Item>
            </Descriptions>
            <Form form={editForm} layout="vertical">
              <Form.Item name="code" label="编码" rules={[{ required: true }]}>
                <Input />
              </Form.Item>
              <Form.Item name="name" label="名称" rules={[{ required: true }]}>
                <Input />
              </Form.Item>
              <Form.Item name="description" label="说明">
                <Input.TextArea rows={2} />
              </Form.Item>
              <Form.Item name="aromaType" label="推荐香型">
                <Select allowClear placeholder="不限香型" options={Object.entries(AROMA_TYPE_LABELS).map(([value, label]) => ({ value, label }))} />
              </Form.Item>
              <Form.Item name="sortOrder" label="排序">
                <InputNumber min={0} style={{ width: '100%' }} />
              </Form.Item>
              <Form.Item name="status" label="状态">
                <Select options={Object.entries(DETAIL_TEMPLATE_STATUS_LABELS).map(([value, label]) => ({ value, label }))} />
              </Form.Item>
              <Divider />
              <TemplateContentFields />
            </Form>
          </>
        )}
      </Drawer>
      <Modal title="新建详情模板" open={createOpen} onCancel={() => setCreateOpen(false)} onOk={async () => {
        const v = await createForm.validateFields();
        const payload = buildPayload(v);
        await request('/admin/product-detail-templates', { method: 'POST', body: JSON.stringify(payload) });
        message.success('已创建');
        setCreateOpen(false);
        createForm.resetFields();
        void reload();
      }} width={640}>
        <Form form={createForm} layout="vertical" initialValues={{
          status: 'ACTIVE', sortOrder: 0,
          detailImageUrls: [''],
          features: [{ icon: 'water_drop', title: '', desc: '' }],
        }}>
          <Form.Item name="code" label="编码" rules={[{ required: true }]} extra="唯一标识，如 dukang-classic">
            <Input />
          </Form.Item>
          <Form.Item name="name" label="名称" rules={[{ required: true }]}>
            <Input />
          </Form.Item>
          <Form.Item name="description" label="说明">
            <Input.TextArea rows={2} />
          </Form.Item>
          <Form.Item name="aromaType" label="推荐香型">
            <Select allowClear placeholder="不限香型" options={Object.entries(AROMA_TYPE_LABELS).map(([value, label]) => ({ value, label }))} />
          </Form.Item>
          <Form.Item name="sortOrder" label="排序">
            <InputNumber min={0} style={{ width: '100%' }} />
          </Form.Item>
          <Form.Item name="status" label="状态">
            <Select options={Object.entries(DETAIL_TEMPLATE_STATUS_LABELS).map(([value, label]) => ({ value, label }))} />
          </Form.Item>
          <Divider />
          <TemplateContentFields />
        </Form>
      </Modal>
    </div>
  );
}