using System.Linq.Expressions;

namespace CMS.Plugin.HIAWms.Domain.WmsMaterials
{
    /// <summary>
    /// WmsMaterial规约
    /// </summary>
    public class WmsMaterialSpecification : Volo.Abp.Specifications.Specification<WmsMaterial>
    {
        private readonly string _materialCode;

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

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

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

            if (_materialCode != null)
            {
                expression = expression.And(c => c.MaterialCode == _materialCode);
            }

            return expression;
        }
    }
}