using System.Linq.Expressions;

namespace CMS.Plugin.HIAWms.Domain.WmsAreas
{
    /// <summary>
    /// WmsArea规约
    /// </summary>
    public class WmsAreaSpecification : Volo.Abp.Specifications.Specification<WmsArea>
    {
        private readonly string _areaCode;

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

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

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

            if (_areaCode != null)
            {
                expression = expression.And(c => c.AreaNo == _areaCode);
            }

            return expression;
        }
    }
}