using System.Linq.Expressions;

namespace CMS.Plugin.HIAWms.Domain.WmsMaterialStocks
{
    /// <summary>
    /// WmsMaterialStock规约
    /// </summary>
    public class WmsMaterialStockSpecification : Volo.Abp.Specifications.Specification<WmsMaterialStock>
    {
        private readonly string _materialName;

        /// <summary>
        /// Initializes a new instance of the <see cref="WmsMaterialStockSpecification"/> class.
        /// </summary>
        public WmsMaterialStockSpecification()
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="WmsMaterialStockSpecification"/> class.
        /// </summary>
        /// <param name="materialName">The name.</param>
        public WmsMaterialStockSpecification(string materialName = null)
        {
            _materialName = materialName;
        }

        /// <inheritdoc />
        public override Expression<Func<WmsMaterialStock, bool>> ToExpression()
        {
            Expression<Func<WmsMaterialStock, bool>> expression = c => 1 == 1;

            if (_materialName != null)
            {
                expression = expression.And(c => c.MaterialNo == _materialName);
            }

            return expression;
        }
    }
}