/** 库存/数量显示：保留最多6位小数，去掉末尾多余的0（不强制补零） */
export const formatQuantity = (value) => {
    if (value == null || value === '') return '0';
    const n = Number(value);
    if (Number.isNaN(n)) return '0';
    if (n < 0) return '0';
    return n % 1 === 0 ? String(n) : n.toFixed(6).replace(/\.?0+$/, '');
};

/** 校验最多 N 位小数，用于数量类字段；超过时返回错误信息并阻止提交 */
export const maxDecimalPlaces = (maxDecimals, message) => {
    const factor = Math.pow(10, maxDecimals);
    const msg = message || `最多${maxDecimals}位小数`;
    return (value) => {
        if (value == null || value === '') return undefined;
        const n = Number(value);
        if (Number.isNaN(n)) return undefined;
        const rounded = Math.round(n * factor) / factor;
        if (Math.abs(n - rounded) > 1e-10) return msg;
        return undefined;
    };
};

/** 判断数值是否超过 6 位小数（用于提交前校验） */
export const hasMoreThan6Decimals = (value) => {
    if (value == null || value === '') return false;
    const n = Number(value);
    if (Number.isNaN(n)) return false;
    const rounded = Math.round(n * 1e6) / 1e6;
    return Math.abs(n - rounded) > 1e-10;
};

export const extractNavMenus = (data) => {
    if (!data) {
        return;
    }
    const navMenus = [];
    const traverse = (nodes) => {
        nodes.forEach((node) => {
            if (!node.children) {
                navMenus.push(node);
            } else {
                traverse(node.children);
            }
        });
    };
    traverse(data);
    return navMenus;
};

export const integrateParams = (_params) => {
    const { pagination, sort, filter, ...other } = _params;
    return {
        current: pagination?.page,
        pageSize: pagination?.perPage,
        orderBy: sort?.field + ' ' + sort?.order,
        ...filter,
        ...other
    }
}

export const camelToPascalWithSpaces = (camelCaseString) => {
    if (typeof camelCaseString !== 'string') {
        return '';
    }
    if (camelCaseString.trim() === '') {
        return '';
    }
    return camelCaseString
        .replace(/([a-z0-9])([A-Z])/g, '$1 $2')
        .replace(/^\w/, (c) => c.toUpperCase());
}

export const flattenTree = (nodes, depth = 0) => {
    let result = [];
    nodes.forEach(node => {
        result.push({ ...node, depth });
        if (node.children && node.children.length > 0) {
            result = result.concat(flattenTree(node.children, depth + 1));
        }
    });
    return result;
};

export const haveChildren = (item) => {
    if (Array.isArray(item)) {
        return item.map((k) => haveChildren(k));
    }

    if (item && typeof item === 'object') {
        if (item.id !== undefined) {
            item.id = item.id.toString();
        }

        if (item.children && Array.isArray(item.children)) {
            item.children = haveChildren(item.children);
        }
    }

    return item;
};