import { useMemo, useRef, useState } from 'react';
import {
  Button, Descriptions, Divider, Drawer, Form, Input, InputNumber, Modal, Popconfirm, Select, Space,
  Switch, Table, Tabs, 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, PRODUCT_STATUS_LABELS, fmtTime } from '../lib/constants';
import { useAdminList } from '../lib/useAdminList';
import OssUpload from '../components/OssUpload';
import DetailImageUrlList from '../components/DetailImageUrlList';
import ProductDetailTemplatePicker from '../components/ProductDetailTemplatePicker';
import type { FormInstance } from 'antd/es/form';

type ProductDetailContentDto = {
  storyTitle?: string;
  storyText?: string;
  features?: Array<{ icon: string; title: string; desc: string }>;
};

type Row = {
  id: string;
  skuCode: string;
  barcode69: string;
  name: string;
  subtitle?: string;
  aromaType: string;
  spec: string;
  price: number;
  benefitAmount: number;
  status: string;
  sortOrder: number;
  allowOnSitePickup?: boolean;
  allowOnlinePurchase?: boolean;
  allowCrossCityDelivery?: boolean;
  visibilityWhitelistEnabled?: boolean;
  visibilityPhones?: string[];
  mainImageUrl?: string | null;
  carouselUrls?: string[];
  detailImageUrls?: string[];
  detailContent?: ProductDetailContentDto | null;
  createdAt: string;
};

type ProductFormValues = {
  skuCode?: string;
  barcode69?: string;
  name: string;
  subtitle?: string;
  aromaType?: string;
  spec: string;
  price: number;
  benefitAmount?: number;
  status?: string;
  sortOrder?: number;
  allowOnSitePickup?: boolean;
  allowOnlinePurchase?: boolean;
  allowCrossCityDelivery?: boolean;
  visibilityWhitelistEnabled?: boolean;
  visibilityPhones?: string[];
  coverUrl?: string;
  carouselUrls?: string[];
  detailImageUrls?: string[];
  storyTitle?: string;
  storyText?: string;
  features?: Array<{ icon?: string; title?: string; desc?: string }>;
};

type UserPickRow = {
  id: string;
  phone?: string | null;
  nickname?: string | null;
  userNo?: string;
};

function mapDetailToForm(d: Record<string, unknown>) {
  const detail = (d.detailContent ?? {}) as ProductDetailContentDto;
  const row = d as Row;
  return {
    ...d,
    coverUrl: (d as { mainImageUrl?: string }).mainImageUrl,
    carouselUrls: (row.carouselUrls?.length ? row.carouselUrls : ['']) as string[],
    detailImageUrls: (row.detailImageUrls?.length ? row.detailImageUrls : ['']) as string[],
    allowOnlinePurchase: row.allowOnlinePurchase !== false,
    allowCrossCityDelivery: row.allowOnlinePurchase === false ? false : row.allowCrossCityDelivery !== false,
    allowOnSitePickup: !!row.allowOnSitePickup,
    visibilityWhitelistEnabled: !!row.visibilityWhitelistEnabled,
    visibilityPhones: (row.visibilityPhones ?? []) as string[],
    storyTitle: detail.storyTitle ?? '',
    storyText: detail.storyText ?? '',
    features: detail.features?.length
      ? detail.features
      : [{ icon: 'water_drop', title: '', desc: '' }],
  };
}

function buildProductPayload(v: ProductFormValues) {
  const carouselUrls = (v.carouselUrls ?? []).map((u) => u?.trim()).filter(Boolean);
  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() || '',
    }));

  const detailContent: ProductDetailContentDto = {
    storyTitle: v.storyTitle?.trim() || undefined,
    storyText: v.storyText?.trim() || undefined,
    features: features.length ? features : undefined,
  };

  const visibilityPhones = (v.visibilityPhones ?? [])
    .map((p) => String(p || '').replace(/\D/g, '').trim())
    .filter(Boolean);

  return {
    barcode69: v.barcode69,
    name: v.name,
    subtitle: v.subtitle,
    aromaType: v.aromaType,
    spec: v.spec,
    price: v.price,
    benefitAmount: v.benefitAmount,
    status: v.status,
    sortOrder: v.sortOrder,
    allowOnSitePickup: !!v.allowOnSitePickup,
    allowOnlinePurchase: v.allowOnlinePurchase !== false,
    allowCrossCityDelivery:
      v.allowOnlinePurchase === false ? false : v.allowCrossCityDelivery !== false,
    visibilityWhitelistEnabled: !!v.visibilityWhitelistEnabled,
    visibilityPhones,
    coverUrl: v.coverUrl,
    carouselUrls,
    detailImageUrls,
    detailContent,
  };
}

function ImageUrlList({ name, label, bizType }: { name: string; label: string; bizType: string }) {
  return (
    <Form.List name={name}>
      {(fields, { add, remove }) => (
        <>
          {fields.map((field) => (
            <Space key={field.key} align="start" style={{ display: 'flex', marginBottom: 8 }}>
              <Form.Item {...field} style={{ flex: 1, marginBottom: 0 }}>
                <OssUpload bizType={bizType} mediaType="IMAGE" />
              </Form.Item>
              {fields.length > 1 && (
                <MinusCircleOutlined onClick={() => remove(field.name)} style={{ marginTop: 8 }} />
              )}
            </Space>
          ))}
          <Button type="dashed" onClick={() => add('')} block icon={<PlusOutlined />}>
            添加{label}
          </Button>
        </>
      )}
    </Form.List>
  );
}

function ProductDetailFields({ form, aromaType }: { form: FormInstance; aromaType?: string }) {
  return (
    <>
      <ProductDetailTemplatePicker form={form} aromaType={aromaType} />
      <Divider />
      <Typography.Text type="secondary">详情页轮播（CAROUSEL，单张最大 10MB）</Typography.Text>
      <ImageUrlList name="carouselUrls" label="轮播图" bizType="CAROUSEL" />
      <Divider />
      <Typography.Text type="secondary">详情长图（DETAIL，可逐张修改，单张最大 10MB）</Typography.Text>
      <DetailImageUrlList label="详情图" bizType="DETAIL" />
      <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>
    </>
  );
}

function VisibilityWhitelistFields({ form }: { form: FormInstance }) {
  const [userOptions, setUserOptions] = useState<UserPickRow[]>([]);
  const [userSearching, setUserSearching] = useState(false);
  const searchTimer = useRef<ReturnType<typeof setTimeout> | null>(null);

  async function searchUsers(keyword: string) {
    const q = keyword.trim();
    if (searchTimer.current) clearTimeout(searchTimer.current);
    if (!q) {
      setUserOptions([]);
      return;
    }
    searchTimer.current = setTimeout(() => {
      void (async () => {
        setUserSearching(true);
        try {
          const qs = new URLSearchParams({ page: '1', pageSize: '20', phone: q });
          const res = await request<{ items: UserPickRow[] }>(`/admin/users?${qs}`);
          setUserOptions((res.items ?? []).filter((u) => !!u.phone));
        } catch {
          setUserOptions([]);
        } finally {
          setUserSearching(false);
        }
      })();
    }, 300);
  }

  const enabled = Form.useWatch('visibilityWhitelistEnabled', form);

  return (
    <>
      <Form.Item
        name="visibilityWhitelistEnabled"
        label="可见白名单"
        valuePropName="checked"
        extra="开启后仅名单内手机号在 C 端可见/可购，用于在线测试"
      >
        <Switch checkedChildren="开" unCheckedChildren="关" />
      </Form.Item>
      {enabled ? (
        <>
          <Form.Item
            name="visibilityPhones"
            label="白名单手机号"
            rules={[{ required: true, message: '请至少添加一个手机号' }]}
            extra="可直接输入多个手机号回车添加，或从下方用户库选择"
          >
            <Select
              mode="tags"
              tokenSeparators={[',', ' ', '，', ';', '；']}
              placeholder="输入手机号后回车"
              style={{ width: '100%' }}
            />
          </Form.Item>
          <Form.Item label="从用户库添加">
            <Select
              showSearch
              filterOption={false}
              placeholder="按手机号搜索用户"
              loading={userSearching}
              options={userOptions.map((u) => ({
                value: u.phone!,
                label: `${u.phone}${u.nickname ? ` · ${u.nickname}` : ''}${u.userNo ? `（${u.userNo}）` : ''}`,
              }))}
              onSearch={searchUsers}
              onSelect={(phone: string) => {
                const cur = (form.getFieldValue('visibilityPhones') as string[] | undefined) ?? [];
                if (!cur.includes(phone)) {
                  form.setFieldsValue({ visibilityPhones: [...cur, phone] });
                }
              }}
              notFoundContent={userSearching ? '搜索中…' : '输入手机号搜索'}
            />
          </Form.Item>
        </>
      ) : null}
    </>
  );
}

function BaseInfoFields({ mode, form }: { mode: 'create' | 'edit'; form: FormInstance }) {
  return (
    <>
      {mode === 'create' && (
        <>
          <Form.Item label="SKU">
            <Input disabled placeholder="保存后自动生成" />
          </Form.Item>
          <Form.Item name="barcode69" label="69码" rules={[{ required: true }]}>
            <Input />
          </Form.Item>
          <Form.Item name="aromaType" label="香型" rules={[{ required: true }]}>
            <Select options={Object.entries(AROMA_TYPE_LABELS).map(([value, label]) => ({ value, label }))} />
          </Form.Item>
        </>
      )}
      <Form.Item name="name" label="商品名" rules={[{ required: true }]}>
        <Input />
      </Form.Item>
      <Form.Item name="subtitle" label="副标题">
        <Input />
      </Form.Item>
      <Form.Item name="spec" label="规格" rules={[{ required: true }]}>
        <Input placeholder="500ml | 52度" />
      </Form.Item>
      <Form.Item name="price" label="售价" rules={[{ required: true }]}>
        <InputNumber min={0} style={{ width: '100%' }} />
      </Form.Item>
      <Form.Item name="benefitAmount" label="权益额">
        <InputNumber min={0} style={{ width: '100%' }} />
      </Form.Item>
      <Form.Item name="status" label="状态">
        <Select options={Object.entries(PRODUCT_STATUS_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="allowOnlinePurchase"
        label="允许线上购买"
        valuePropName="checked"
        extra="配送到址（同城）"
      >
        <Switch
          checkedChildren="开"
          unCheckedChildren="关"
          onChange={(checked) => {
            if (!checked) form.setFieldsValue({ allowCrossCityDelivery: false });
          }}
        />
      </Form.Item>
      <Form.Item noStyle shouldUpdate={(prev, cur) => prev.allowOnlinePurchase !== cur.allowOnlinePurchase}>
        {() => (
          <Form.Item
            name="allowCrossCityDelivery"
            label="允许跨城配送"
            valuePropName="checked"
            extra="须先开启线上购买"
          >
            <Switch
              checkedChildren="开"
              unCheckedChildren="关"
              disabled={!form.getFieldValue('allowOnlinePurchase')}
            />
          </Form.Item>
        )}
      </Form.Item>
      <Form.Item name="allowOnSitePickup" label="允许现场取货" valuePropName="checked">
        <Switch checkedChildren="开" unCheckedChildren="关" />
      </Form.Item>
      <VisibilityWhitelistFields form={form} />
      <Form.Item name="coverUrl" label="封面">
        <OssUpload bizType="COVER" mediaType="IMAGE" />
      </Form.Item>
    </>
  );
}

export default function ProductsPage() {
  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/products',
    () => {
      const qs = new URLSearchParams();
      if (filters.name) qs.set('name', filters.name);
      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);

  async function handleDelete(row: Row) {
    try {
      await request(`/admin/products/${row.id}`, { method: 'DELETE' });
      message.success('已删除');
      if (detail?.id === row.id) {
        setDrawerOpen(false);
        setDetail(null);
      }
      void reload();
    } catch (e) {
      message.error(e instanceof Error ? e.message : '删除失败');
    }
  }

  const columns: ColumnsType<Row> = useMemo(() => [
    { title: 'SKU', dataIndex: 'skuCode', width: 90 },
    { title: '商品名', dataIndex: 'name', width: 180, ellipsis: true },
    { title: '香型', dataIndex: 'aromaType', width: 80, render: (v) => AROMA_TYPE_LABELS[v] || v },
    { title: '规格', dataIndex: 'spec', width: 120, ellipsis: true },
    { title: '售价', dataIndex: 'price', width: 80, render: (v) => `¥${v}` },
    { title: '权益额', dataIndex: 'benefitAmount', width: 80, render: (v) => `¥${v}` },
    { title: '状态', dataIndex: 'status', width: 80, render: (s) => (
      <Tag color={s === 'ON_SALE' ? 'green' : undefined}>{PRODUCT_STATUS_LABELS[s] || s}</Tag>
    ) },
    {
      title: '白名单',
      dataIndex: 'visibilityWhitelistEnabled',
      width: 90,
      render: (v: boolean, row) =>
        v ? <Tag color="orange">限{row.visibilityPhones?.length ?? 0}人</Tag> : <Tag>公开</Tag>,
    },
    {
      title: '履约',
      key: 'fulfillment',
      width: 160,
      render: (_, row) => (
        <Space size={[0, 4]} wrap>
          {row.allowOnlinePurchase !== false ? <Tag color="blue">线上</Tag> : null}
          {row.allowOnlinePurchase !== false && row.allowCrossCityDelivery !== false ? (
            <Tag color="cyan">跨城</Tag>
          ) : null}
          {row.allowOnSitePickup ? <Tag color="green">现场</Tag> : null}
          {row.allowOnlinePurchase === false && !row.allowOnSitePickup ? <Tag>无</Tag> : null}
        </Space>
      ),
    },
    { title: '排序', dataIndex: 'sortOrder', width: 60 },
    { title: '创建', dataIndex: 'createdAt', width: 160, render: fmtTime },
    {
      title: '操作', width: 120,
      render: (_, row) => (
        <Space size={0}>
          <Button type="link" size="small" onClick={async () => {
            const d = await request<Record<string, unknown>>(`/admin/products/${row.id}`);
            setDetail(d);
            editForm.setFieldsValue(mapDetailToForm(d));
            setDrawerOpen(true);
          }}>编辑</Button>
          <Popconfirm
            title="确认删除该商品？"
            description={`将永久删除「${row.name}」（${row.skuCode}），此操作不可恢复。`}
            okText="确认删除"
            cancelText="取消"
            okButtonProps={{ danger: true }}
            onConfirm={() => handleDelete(row)}
          >
            <Button type="link" size="small" danger>删除</Button>
          </Popconfirm>
        </Space>
      ),
    },
  ], [detail, editForm]);

  return (
    <div>
      <Space style={{ marginBottom: 16, width: '100%', justifyContent: 'space-between' }}>
        <Typography.Title level={4} style={{ margin: 0 }}>商品管理</Typography.Title>
        <Button type="primary" onClick={() => setCreateOpen(true)}>新建商品</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="status" label="状态">
          <Select allowClear style={{ width: 110 }} options={Object.entries(PRODUCT_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: 1320 }}
        pagination={{ current: page, pageSize, total: data?.total ?? 0, showSizeChanger: true, onChange: (p, ps) => { setPage(p); setPageSize(ps); } }} />
      <Drawer title="编辑商品" width={720} open={drawerOpen} onClose={() => setDrawerOpen(false)}
        extra={detail && (
          <Button type="primary" onClick={async () => {
            const v = await editForm.validateFields();
            if (!v.allowOnlinePurchase && !v.allowOnSitePickup) {
              message.error('请至少勾选「允许线上购买」或「允许现场取货」之一');
              return;
            }
            const payload = buildProductPayload(v);
            await request(`/admin/products/${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="SKU">{String(detail.skuCode)}</Descriptions.Item>
              <Descriptions.Item label="69码">{String(detail.barcode69)}</Descriptions.Item>
              <Descriptions.Item label="香型">{AROMA_TYPE_LABELS[String(detail.aromaType)] || String(detail.aromaType)}</Descriptions.Item>
            </Descriptions>
            <Form form={editForm} layout="vertical">
              <Tabs items={[
                { key: 'base', label: '基础信息', children: <BaseInfoFields mode="edit" form={editForm} /> },
                {
                  key: 'detail',
                  label: '详情页',
                  children: (
                    <ProductDetailFields
                      form={editForm}
                      aromaType={String(detail.aromaType ?? '')}
                    />
                  ),
                },
              ]} />
            </Form>
          </>
        )}
      </Drawer>
      <Modal title="新建商品" open={createOpen} onCancel={() => setCreateOpen(false)} onOk={async () => {
        const v = await createForm.validateFields();
        if (!v.allowOnlinePurchase && !v.allowOnSitePickup) {
          message.error('请至少勾选「允许线上购买」或「允许现场取货」之一');
          return;
        }
        const payload = buildProductPayload(v);
        await request('/admin/products', { method: 'POST', body: JSON.stringify(payload) });
        message.success('已创建');
        setCreateOpen(false);
        createForm.resetFields();
        void reload();
      }} width={720}>
        <Form form={createForm} layout="vertical" initialValues={{
          aromaType: 'QINGXIANG', status: 'DRAFT', sortOrder: 0,
          allowOnlinePurchase: true, allowCrossCityDelivery: true, allowOnSitePickup: false,
          visibilityWhitelistEnabled: false, visibilityPhones: [],
          carouselUrls: [''], detailImageUrls: [''],
          features: [{ icon: 'water_drop', title: '', desc: '' }],
        }}>
          <Tabs items={[
            { key: 'base', label: '基础信息', children: <BaseInfoFields mode="create" form={createForm} /> },
            {
              key: 'detail',
              label: '详情页',
              children: (
                <Form.Item noStyle shouldUpdate={(prev, cur) => prev.aromaType !== cur.aromaType}>
                  {() => (
                    <ProductDetailFields
                      form={createForm}
                      aromaType={createForm.getFieldValue('aromaType') as string | undefined}
                    />
                  )}
                </Form.Item>
              ),
            },
          ]} />
        </Form>
      </Modal>
    </div>
  );
}