import { useEffect, useMemo } from 'react';
import { Fragment } from 'react'
import { getAllProducts } from '../api/product';
import { useDispatch, useSelector } from 'react-redux';
import { fetchProduct, setShowStock, setFilterName } from '../store/slice/productSlice';
function Product() {
    const dispatch = useDispatch();
    useEffect(() => {
        dispatch(fetchProduct())
    }, [dispatch])
    const { products, filterName, showStock } = useSelector(x => x.productSlice);


    const filterProducts = useMemo(() => {
        return products.filter(item => item.name.includes(filterName) && (showStock ? item.stocked : true))
    }, [products, filterName, showStock])

    const renderProduct = () => {
        let prevCategory = ''
        return filterProducts.map((product, index) => {
            const showCategoryHeader = prevCategory !== product.category
            prevCategory = product.category

            return (
                <Fragment key={product.name + index}>
                    {showCategoryHeader && (
                        <tr style={{ background: '#e8f0fe' }}>
                            <td colSpan={2}>
                                <strong>{product.category}</strong>
                            </td>
                        </tr>
                    )}
                    <tr>
                        <td>
                            <span style={{ color: product.stocked ? '#333' : '#e74c3c' }}>
                                {product.name}
                            </span>
                            {!product.stocked && (
                                <span style={{ color: '#e74c3c', fontSize: 12, marginLeft: 8 }}>
                                    (缺货)
                                </span>
                            )}
                        </td>
                        <td>{product.price}</td>
                    </tr>
                </Fragment>
            )
        })
    }
    return (
        <div>
            <h1>📦 商品列表</h1>
            <div style={{ margin: '16px 0', display: 'flex', gap: 16, alignItems: 'center' }}>
                <input type="text" placeholder='搜索商品名称...' onChange={(e) => dispatch(setFilterName(e.target.value))} style={{ padding: '8px 12px', borderRadius: 6, border: '1px solid #d9d9d9', width: 240 }} />

                <label style={{ cursor: 'pointer' }}>
                    <input type="checkbox" style={{ marginRight: 6 }} onChange={(e) => dispatch(setShowStock(e.target.checked))} />仅显示有库存的商品</label>
            </div>
            <table border={1} cellPadding={12} style={{ borderCollapse: 'collapse', width: '100%' }}>
                <thead>
                    <tr style={{ background: '#1a73e8', color: '#fff' }}>
                        <th>商品名称</th>
                        <th>商品价格</th>
                    </tr>
                </thead>
                <tbody>
                    {filterProducts.length === 0 ? (
                        <tr>
                            <td colSpan={2} style={{ textAlign: 'center', padding: 40, color: '#999' }}>
                                📭 暂无匹配商品
                            </td>
                        </tr>
                    ) : (
                        renderProduct()
                    )}
                </tbody>
            </table>
        </div>
    )
}

export default Product;