import React, { useEffect, useMemo, useRef, useState } from 'react';
import {
  Alert,
  Button, Card,
  Drawer,
  Image,
  Input,
  InputNumber,
  message,
  Modal,
  Space,
  Table,
  Tag, Tree,
  TreeSelect,
  Typography,
  Upload,
} from 'antd';
import { DeleteOutlined, DownloadOutlined, InboxOutlined, TableOutlined, UploadOutlined } from '@ant-design/icons';
import type { TableProps } from 'antd';
import XinTable from '@/components/XinTable';
import AuthButton from '@/components/AuthButton';
import type { XinTableColumn, XinTableInstance, XinTableProps } from '@/components/XinTable/typings.ts';
import type IProduct from '@/domain/iProduct.ts';
import type { IBatchPriceUpdate, IPriceMatrixRow } from '@/domain/iProduct.ts';
import { PRODUCT_STATUS_MAP } from '@/domain/iProduct.ts';
import type ICustomerLevel from '@/domain/iCustomerLevel.ts';
import type {IProductCategoryTree} from '@/domain/iProductCategory.ts';
import { getSupplierOptions } from '@/api/customer/supplier.ts';
import type ISupplier from '@/domain/iSupplier.ts';
import { getCategoryTree } from '@/api/product/category.ts';
import { batchDeleteProducts, batchPrice, getPriceMatrix } from '@/api/product/goods.ts';
import type { IImportError } from '@/api/product/goods.ts';
import { downloadProductTemplate, exportProducts, importProducts } from '@/api/product/goods.ts';

const { Title, Text } = Typography;

/** 四舍五入保留两位 */
const round2 = (v: number) => Math.round(v * 100) / 100;

/** 商品表单用分类树：有子分类的节点禁选（商品只能挂在末级分类上） */
const markParentDisabled = (nodes: IProductCategoryTree[]): IProductCategoryTree[] =>
  nodes.map((node) => ({
    ...node,
    disabled: !!node.children?.length,
    children: node.children?.length ? markParentDisabled(node.children) : node.children,
  }));

/** 侧栏用分类树：有子分类的节点不可选中（仅供展开，筛选按末级分类） */
const markParentUnselectable = (nodes: IProductCategoryTree[]): IProductCategoryTree[] =>
  nodes.map((node) => ({
    ...node,
    selectable: !node.children?.length,
    children: node.children?.length ? markParentUnselectable(node.children) : node.children,
  }));

/**
 * 商品档案管理（A1 商品列表 / A2 价格矩阵与批量调价）
 *
 * 价格体系：售价 = 成本价 × (100 + 客户等级上浮比例) / 100；
 * 等级上浮比例在「客户等级」中维护，本页价格矩阵仅批量调整成本价。
 */
const ProductGoodsPage: React.FC = () => {
  const [suppliers, setSuppliers] = useState<ISupplier[]>([]);
  const [categoryTree, setCategoryTree] = useState<IProductCategoryTree[]>([]);
  // 商品表单专用分类树：父分类禁选，仅末级可选（侧栏筛选/价格矩阵仍用原始树）
  const formCategoryTree = useMemo(() => markParentDisabled(categoryTree), [categoryTree]);
  // 侧栏分类树：父分类不可选中，仅作展开归组
  const sidebarCategoryTree = useMemo(() => markParentUnselectable(categoryTree), [categoryTree]);

  // ===== 分类侧栏 =====
  const [activeCategory, setActiveCategory] = useState<number | undefined>(undefined);
  const tableRef = useRef<XinTableInstance<IProduct> | null>(null);
  useEffect(() => {
    setSelectedRowKeys([]);
    tableRef.current?.reset();
  }, [activeCategory]);

  // ===== 批量删除 =====
  const [selectedRowKeys, setSelectedRowKeys] = useState<number[]>([]);
  const [batchDeleting, setBatchDeleting] = useState(false);

  /** 批量删除（软删除，成功后清空勾选并刷新列表） */
  const handleBatchDelete = () => {
    window.$modal?.confirm({
      title: `确定要删除选中的 ${selectedRowKeys.length} 件商品吗？`,
      okText: '删除',
      okButtonProps: { danger: true },
      cancelText: '取消',
      onOk: async () => {
        setBatchDeleting(true);
        try {
          await batchDeleteProducts(selectedRowKeys);
          message.success('批量删除成功');
          setSelectedRowKeys([]);
          await tableRef.current?.reload();
        } finally {
          setBatchDeleting(false);
        }
      },
    });
  };

  // ===== 价格矩阵抽屉 =====
  const [matrixOpen, setMatrixOpen] = useState(false);
  const [matrixLoading, setMatrixLoading] = useState(false);
  const [saveLoading, setSaveLoading] = useState(false);
  const [matrixRows, setMatrixRows] = useState<IPriceMatrixRow[]>([]);
  const [matrixPage, setMatrixPage] = useState(1);
  const [matrixPageSize, setMatrixPageSize] = useState(20);
  const [matrixTotal, setMatrixTotal] = useState(0);
  const [matrixLevels, setMatrixLevels] = useState<ICustomerLevel[]>([]);
  const [matrixKeyword, setMatrixKeyword] = useState('');
  const [matrixCategory, setMatrixCategory] = useState<number | undefined>(undefined);
  /** 跨页未保存的成本价：productId → cost（null 视为未修改，不提交） */
  const costDirtyRef = useRef<Record<number, number | null>>({});

  // ===== Excel 导入/导出 =====
  const [exportLoading, setExportLoading] = useState(false);
  const [importOpen, setImportOpen] = useState(false);
  const [importFile, setImportFile] = useState<File | null>(null);
  const [importing, setImporting] = useState(false);
  const [importErrors, setImportErrors] = useState<IImportError[]>([]);

  /** 导出商品列表（跟随侧栏分类筛选；列格式与导入模板一致） */
  const handleExport = async () => {
    setExportLoading(true);
    try {
      await exportProducts(activeCategory ? { category_id: activeCategory } : {});
    } finally {
      setExportLoading(false);
    }
  };

  /** 提交导入：成功刷新列表；校验失败展示错误行明细（错误提示由拦截器统一弹出） */
  const handleImport = async () => {
    if (!importFile) {
      return;
    }
    setImporting(true);
    setImportErrors([]);
    try {
      await importProducts(importFile);
      setImportOpen(false);
      setImportFile(null);
      tableRef.current?.reset();
    } catch (err: any) {
      const errors = err?.data?.data?.errors;
      if (Array.isArray(errors)) {
        setImportErrors(errors);
      }
    } finally {
      setImporting(false);
    }
  };

  useEffect(() => {
    getSupplierOptions().then((res) => setSuppliers(res.data.data ?? []));
    getCategoryTree().then((res) => setCategoryTree(res.data.data ?? []));
  }, []);

  const loadMatrix = async (
    keyword = matrixKeyword,
    categoryId = matrixCategory,
    page = matrixPage,
    pageSize = matrixPageSize
  ) => {
    setMatrixLoading(true);
    try {
      const res = await getPriceMatrix({
        keyword: keyword || undefined,
        category_id: categoryId,
        page,
        pageSize,
      });
      const rows = res.data.data?.rows ?? [];
      const levels = res.data.data?.levels ?? [];
      // 叠加跨页未保存的成本价修改，并重算各等级展示价，保证翻页后输入值不回退
      const merged = rows.map((row) => {
        const dirty = costDirtyRef.current[row.id];
        if (dirty === undefined) return row;
        const next: IPriceMatrixRow = { ...row, cost_price: dirty };
        const cost = Number(dirty ?? 0);
        levels.forEach((level) => {
          if (level.id == null) return;
          next[`price_${level.id}`] = cost > 0
            ? round2(cost * (1 + Number(level.percent ?? 0) / 100))
            : null;
        });
        return next;
      });
      setMatrixRows(merged);
      setMatrixTotal(res.data.data?.total ?? 0);
      setMatrixLevels(levels);
    } finally {
      setMatrixLoading(false);
    }
  };

  const openMatrix = () => {
    setMatrixOpen(true);
    setMatrixPage(1);
    setMatrixPageSize(20);
    loadMatrix('', undefined, 1, 20);
  };

  /** 修改成本价：联动重算各等级展示价（上浮比例取 levels 配置） */
  const onMatrixCostChange = (productId: number, value: number | null) => {
    costDirtyRef.current[productId] = value;
    setMatrixRows((prev) =>
      prev.map((row) => {
        if (row.id !== productId) return row;
        const next: IPriceMatrixRow = { ...row, cost_price: value };
        const cost = Number(value ?? 0);
        matrixLevels.forEach((level) => {
          if (level.id == null) return;
          next[`price_${level.id}`] = cost > 0
            ? round2(cost * (1 + Number(level.percent ?? 0) / 100))
            : null;
        });
        return next;
      })
    );
  };

  /** 提交所有跨页未保存的成本价调整（null 视为清除，不提交） */
  const saveMatrix = async () => {
    const updates: IBatchPriceUpdate[] = [];
    Object.entries(costDirtyRef.current).forEach(([pid, cost]) => {
      if (cost === null || cost === undefined) return;
      updates.push({ product_id: Number(pid), cost_price: cost });
    });
    if (updates.length === 0) {
      message.info('没有需要保存的价格调整');
      return;
    }
    setSaveLoading(true);
    try {
      await batchPrice(updates);
      message.success(`已更新 ${updates.length} 件商品成本价，各等级售价已按上浮比例联动，受影响门店将收到通知`);
      costDirtyRef.current = {};
      await loadMatrix();
    } finally {
      setSaveLoading(false);
    }
  };

  const matrixColumns: TableProps<IPriceMatrixRow>['columns'] = [
    {
      title: '商品',
      dataIndex: 'name',
      fixed: 'left',
      width: 160,
      render: (name: string, row) => (
        <div>
          <div className="font-medium">{name}</div>
          <Text type="secondary" className="text-xs">
            {row.spec}
            {row.unit ? ` / ${row.unit}` : ''}
          </Text>
        </div>
      ),
    },
    {
      title: '成本价',
      key: 'cost_price',
      fixed: 'left',
      width: 130,
      render: (_: unknown, row: IPriceMatrixRow) => (
        <InputNumber
          size="small"
          min={0}
          precision={2}
          prefix="¥"
          value={row.cost_price as number | null}
          onChange={(v) => onMatrixCostChange(row.id, v)}
          className="w-32"
        />
      ),
    },
    ...matrixLevels.map((level) => ({
      title: level.name,
      key: `price_${level.id}`,
      width: 150,
      render: (_: unknown, row: IPriceMatrixRow) => {
        const price = row[`price_${level.id}`];
        return (
          <div>
            <div>{price != null ? `¥${price}` : <Text type="secondary">未设成本价</Text>}</div>
            <div className="text-xs text-gray-400">成本上浮 {Number(level.percent ?? 0)}%</div>
          </div>
        );
      },
    })),
  ];

  const columns: XinTableColumn<IProduct>[] = [
    // {
    //   title: 'ID',
    //   dataIndex: 'id',
    //   hideInForm: true,
    //   hideInSearch: true,
    //   width: 70,
    //   align: 'center',
    // },
    {
      title: '商品名称',
      align: 'center',
      dataIndex: 'name',
      valueType: 'text',
      colProps: { span: 24 },
      required: true,
      render: (_, record) => {
        return (
          <div>
            <div className={"mb-1.5"}>{ record.name }</div>
            <div className={"text-[#999] text-[12px]"}>{ record.remark }</div>
          </div>
        )
      },
      rules: [{ required: true, message: '请输入商品名称' }],
    },
    {
      title: '商品图片',
      dataIndex: 'image_ids',
      valueType: 'image',
      fieldProps: {
        action: '/product/goods/upload',
        maxWidth: 3000,
        maxHeight: 3000,
        maxSize: 10,
        mode: 'multiple',
        maxCount: 5,
        changeType: "id"
      },
      render: (_, record) => {
        if (!record.images_arr || record.images_arr?.length <= 0) return '-';
        return (
          <Space wrap={false}>
            {record.images_arr.map(i => (
              <Image
                key={i.id}
                src={i.preview_url}
                width={60}
                height={60}
                style={{ objectFit: 'cover', borderRadius: 4 }}
              />
            ))}
          </Space>
        );
      },
      align: 'center',
      hideInSearch: true,
      colProps: { span: 24 },
    },
    {
      title: '商品描述',
      dataIndex: 'remark',
      valueType: 'text',
      hideInSearch: true,
      hideInTable: true,
      colProps: { span: 24 },
    },
    {
      title: '成本价',
      dataIndex: 'cost_price',
      valueType: 'digit',
      hideInSearch: true,
      align: 'center',
      tooltip: '各等级售价 = 成本价 × (100 + 等级上浮比例) / 100',
      fieldProps: { min: 0, precision: 2, prefix: '¥' },
      render: (_, record) => {
        const cost = Number(record.cost_price ?? 0);
        return cost > 0 ? `¥${record.cost_price}` : <Text type="secondary">未设置</Text>;
      },
    },
    {
      title: '规格/包规',
      dataIndex: 'spec',
      valueType: 'text',
      hideInSearch: true,
      align: "center",
    },
    {
      title: '单位',
      dataIndex: 'unit',
      valueType: 'text',
      hideInSearch: true,
      initialValue: '斤',
      align: "center",
    },
    {
      title: '单价单位',
      dataIndex: 'price_unit',
      valueType: 'text',
      hideInTable: true,
      hideInSearch: true,
      initialValue: '元/斤',
      fieldProps: { placeholder: '如：元/斤、元/箱', maxLength: 20 },
    },
    {
      title: '排序',
      dataIndex: 'sort',
      valueType: 'digit',
      hideInSearch: true,
      fieldProps: { min: 0 },
      align: 'center',
    },
    {
      title: '分类',
      dataIndex: 'category_id',
      valueType: 'treeSelect',
      required: true,
      align: "center",
      rules: [{ required: true, message: '请选择分类' }],
      fieldProps: {
        treeData: formCategoryTree,
        fieldNames: { label: 'name', value: 'id', children: 'children' },
        treeDefaultExpandAll: true,
        showSearch: true,
        treeNodeFilterProp: 'name',
        placeholder: '选择末级分类',
      },
      hideInSearch: true,
      render: (_, record) =>
        record.category ? <Tag color="cyan">{record.category.name}</Tag> : '-',
    },
    {
      title: '供应商',
      dataIndex: 'supplier_id',
      valueType: 'select',
      hideInSearch: true,
      align: "center",
      fieldProps: {
        options: suppliers.map((s) => ({ label: s.name, value: s.id })),
        showSearch: true,
        optionFilterProp: 'label',
        allowClear: true,
        placeholder: '默认供应商（可选）',
      },
      render: (_, record) => record.supplier?.name ?? '-',
    },
    {
      title: '市场',
      dataIndex: 'market',
      valueType: 'text',
      align: 'center',
      fieldProps: {
        placeholder: '市场名称，如：新发地',
        maxLength: 50,
        allowClear: true,
      },
      render: (_, record) => record.market || '-',
    },
    {
      title: '状态',
      dataIndex: 'status',
      valueType: 'radioButton',
      initialValue: 1,
      fieldProps: {
        options: [
          { value: 1, label: '上架' },
          { value: 0, label: '下架' },
        ],
      },
      render: (_, record) => {
        const item = PRODUCT_STATUS_MAP[record.status ?? 1];
        return <Tag color={item?.color}>{item?.text}</Tag>;
      },
      align: 'center',
    },
    {
      title: '图文详情',
      dataIndex: 'content',
      valueType: 'richText',
      hideInSearch: true,
      hideInTable: true,
      colProps: { span: 24 },
      fieldProps: {
        height: 400,
        groupId: 11,
        placeholder: '输入商品图文详情，支持插入图片',
      },
    },

    {
      title: '等级价格',
      dataIndex: 'prices',
      hideInForm: true,
      hideInSearch: true,
      width: 420,
      align: 'center',
      render: (_, record) => (
        <Space wrap>
          {record.prices?.length
            ? record.prices.map((p) => (
                <Tag
                  key={p.level_id}
                  color="geekblue"
                  title={`按成本价上浮 ${p.percent ?? 0}%`}
                >
                  {p.level?.name ?? `等级${p.level_id}`}
                  <span style={{color: 'red', marginLeft: 5 }}>
                    ¥{p.price ?? '未设定'}
                  </span>
                </Tag>
              ))
            : '-'}
        </Space>
      ),
    },
    {
      title: '创建时间',
      dataIndex: 'created_at',
      hideInForm: true,
      hideInSearch: true,
      align: 'center',
    },
  ];

  const tableProps: XinTableProps<IProduct> = {
    api: '/product/goods',
    columns,
    rowKey: 'id',
    accessName: 'product.goods',
    tableRef,
    scroll: { x: 1200 },
    actionBarRender: (dom) => [
      dom.add,
      dom.search,
      <AuthButton key="batchDelete" auth="product.goods.delete">
        <Button
          danger
          icon={<DeleteOutlined />}
          disabled={selectedRowKeys.length === 0}
          loading={batchDeleting}
          onClick={handleBatchDelete}
        >
          批量删除{selectedRowKeys.length > 0 ? ` (${selectedRowKeys.length})` : ''}
        </Button>
      </AuthButton>,
      <Button key="matrix" icon={<TableOutlined />} onClick={openMatrix}>
        价格矩阵
      </Button>,
      <AuthButton key="export" auth="product.goods.export">
        <Button icon={<DownloadOutlined />} loading={exportLoading} onClick={handleExport}>
          导出
        </Button>
      </AuthButton>,
      <AuthButton key="import" auth="product.goods.import">
        <Button icon={<UploadOutlined />} onClick={() => setImportOpen(true)}>
          导入
        </Button>
      </AuthButton>,
      dom.keywordSearch,
    ],
    formProps: {
      grid: true,
      colProps: { span: 12 },
      rowProps: { gutter: 20 },
      layout: 'vertical',
    },
    requestParams: (params) => ({
      ...params,
      category_id: activeCategory
    }),
    rowSelection: {
      selectedRowKeys,
      onChange: (keys) => setSelectedRowKeys(keys.map(Number)),
    },
    modalProps: {
      width: 800,
      centered: true,
      classNames: { body: "overflow-y-auto [scrollbar-width:none] [&::-webkit-scrollbar]:hidden h-[80vh]" },
    },
  };

  return (
    <>
      <div className="mb-5">
        <Title level={3}>商品列表</Title>
        <Text type="secondary">
          商品售价按客户等级上浮比例自动换算（成本价 × (100 + 上浮比例) / 100）；「价格矩阵」支持批量调整成本价，调价后自动通知受影响门店。
        </Text>
      </div>
      <div className="flex items-start gap-4">
        <Card style={{ width: 200 }} title={'商品分类'}>
          <div
            className={`cursor-pointer rounded-2xl mb-2 px-2 h-6 leading-6 ${activeCategory === undefined ? 'bg-blue-50' : 'hover:bg-gray-50'}`}
            onClick={() => { setActiveCategory(undefined) }}
          >
            全部商品
          </div>
          <Tree<any>
            showLine
            blockNode
            onSelect={(selectedKeys) => setActiveCategory(Number(selectedKeys[0]))}
            treeData={sidebarCategoryTree}
            selectedKeys={activeCategory ? [activeCategory] : undefined}
            fieldNames={{title: 'name', key: 'id', children: 'children'}}
          />
        </Card>
        <div className="min-w-0 flex-1">
          <XinTable<IProduct> {...tableProps} />
        </div>
      </div>

      <Modal
        title="导入商品"
        open={importOpen}
        onCancel={() => setImportOpen(false)}
        onOk={handleImport}
        okText="开始导入"
        okButtonProps={{ disabled: !importFile }}
        confirmLoading={importing}
        destroyOnHidden
        width={560}
      >
        <div className="mb-3">
          <Text type="secondary">
            列格式：品名*、分类*（末级分类，支持「父分类/子分类」路径）、供应商（不存在自动创建）、市场、
            规格/包规、单位（默认斤）、成本价、排序、库存、保质期、状态（上架/下架）、备注。
            导入一律新增商品；整表校验，任何一行有错则全部不导入。
          </Text>
          <Button type="link" className="px-0" onClick={downloadProductTemplate}>
            下载导入模板
          </Button>
        </div>
        <Upload.Dragger
          accept=".xlsx,.xls"
          maxCount={1}
          beforeUpload={(file) => {
            setImportFile(file);
            setImportErrors([]);
            return false;
          }}
          onRemove={() => {
            setImportFile(null);
            setImportErrors([]);
          }}
        >
          <p className="ant-upload-drag-icon">
            <InboxOutlined />
          </p>
          <p className="ant-upload-text">点击或拖拽 Excel 文件到此区域</p>
          <p className="ant-upload-hint">仅支持 .xlsx / .xls，单次最多 1000 行</p>
        </Upload.Dragger>
        {importErrors.length > 0 && (
          <Alert
            className="mt-3"
            type="error"
            showIcon
            message={`共 ${importErrors.length} 处错误，修正后请重新导入`}
            description={
              <ul className="max-h-48 overflow-y-auto pl-4 mb-0 list-disc">
                {importErrors.map((item, index) => (
                  <li key={index}>第 {item.row} 行：{item.message}</li>
                ))}
              </ul>
            }
          />
        )}
      </Modal>

      <Drawer
        title="价格矩阵 · 批量调价"
        open={matrixOpen}
        onClose={() => setMatrixOpen(false)}
        size={1200}
        extra={
          <Space>
            <Button onClick={() => loadMatrix()}>刷新</Button>
            <Button type="primary" loading={saveLoading} onClick={saveMatrix}>
              保存调价
            </Button>
          </Space>
        }
      >
        <Space className="mb-4" wrap>
          <TreeSelect
            style={{ width: 180 }}
            placeholder="按分类筛选"
            allowClear
            treeDefaultExpandAll
            fieldNames={{ label: 'name', value: 'id', children: 'children' }}
            treeData={categoryTree}
            value={matrixCategory}
            onChange={(v) => {
              setMatrixCategory(v);
              setMatrixPage(1);
              loadMatrix(matrixKeyword, v, 1, matrixPageSize);
            }}
          />
          <Input.Search
            style={{ width: 240 }}
            placeholder="搜索品名/规格"
            allowClear
            value={matrixKeyword}
            onChange={(e) => setMatrixKeyword(e.target.value)}
            onSearch={(v) => {
              setMatrixPage(1);
              loadMatrix(v, matrixCategory, 1, matrixPageSize);
            }}
          />
          <Text type="secondary">等级列按上浮比例自动换算，仅成本价可编辑</Text>
        </Space>
        <Table<IPriceMatrixRow>
          rowKey="id"
          size="small"
          loading={matrixLoading}
          columns={matrixColumns}
          dataSource={matrixRows}
          pagination={{
            current: matrixPage,
            pageSize: matrixPageSize,
            total: matrixTotal,
            showSizeChanger: true,
            pageSizeOptions: [20, 50, 100],
            showTotal: (total) => `共 ${total} 件商品`,
            onChange: (page, pageSize) => {
              setMatrixPage(page);
              setMatrixPageSize(pageSize);
              loadMatrix(matrixKeyword, matrixCategory, page, pageSize);
            },
          }}
          scroll={{ x: matrixLevels.length * 150 + 290 }}
        />
      </Drawer>
    </>
  );
};

export default ProductGoodsPage;