laatzen/LaaProductionWeb/LaaProduction.Services/Models/Reports/ReportModelExtensions.cs

namespace LaaProduction.Services.Models.Reports
{
    using System;
    using System.ComponentModel.DataAnnotations;
    using System.ComponentModel.DataAnnotations.Schema;
    using System.Linq.Expressions;
    using System.Reflection;

    public static class ReportModelExtensions
    {
        public static ReportFilterProperty Text<T>(this T model, Expression<Func<T, Object>> expression, Int32 index, Int32 orderBy = 0)
            => model.Property(expression, index, PropertyType.Text, orderBy);

        public static ReportFilterProperty DateTime<T>(this T model, Expression<Func<T, Object>> expression, Int32 index, Int32 orderBy = 0)
            => model.Property(expression, index, PropertyType.Date, orderBy);

        public static ReportFilterProperty Boolean<T>(this T model, Expression<Func<T, Object>> expression, Int32 index, Int32 orderBy = 0)
            => model.Property(expression, index, PropertyType.Bool, orderBy);

        public static ReportFilterProperty Property<T>(this T model, Expression<Func<T, Object>> expression, Int32 index, PropertyType propertyType, Int32 orderBy)
        {
            var memberInfo = default(MemberInfo);

            if (expression.Body is MemberExpression memberExpression)
            {
                memberInfo = memberExpression.Member;
            }
            else if (expression.Body is UnaryExpression unaryExpression && unaryExpression.Operand is MemberExpression operandExpression)
            {
                memberInfo = operandExpression.Member;
            }

            return new ReportFilterProperty
            {
                Column = memberInfo?.GetCustomAttribute<ColumnAttribute>()?.Name,
                Property = memberInfo?.Name,
                OrderBy = orderBy,
                Index = index,
                Type = propertyType
            };
        }

        public static String Display<T>(Expression<Func<T, Object>> expression)
        {
            var memberInfo = default(MemberInfo);

            if (expression.Body is MemberExpression memberExpression)
            {
                memberInfo = memberExpression.Member;
            }
            else if (expression.Body is UnaryExpression unaryExpression && unaryExpression.Operand is MemberExpression operandExpression)
            {
                memberInfo = operandExpression.Member;
            }

            return memberInfo
                ?.GetCustomAttribute<DisplayAttribute>()
                ?.Name;
        }
    }
}