using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;
using EnVisage.Code;

namespace EnVisage.Models
{
	public class ExpenditureModel : IBaseModel<Expenditure>
	{
		public Guid Id { get; set; }
		[Required]
		[MaxLength(100, ErrorMessage = "Expenditure name should not exceed 100 characters")]
		[Display(Name="Expenditure Name")]
		public string Name { get; set; }
		[Display(Name = "Number of Expenditure Categories")]
		public int CategoriesCount { get; set; }

		/// <summary>
		/// Casts a <see cref="Expenditure"/> obect to the object of type <see cref="ExpenditureModel"/>.
		/// </summary>
		/// <param name="obj">A <see cref="Expenditure"/> object.</param>
		/// <returns>A <see cref="ExpenditureModel"/> object filled with data from db.</returns>
		public static explicit operator ExpenditureModel(Expenditure obj)
		{
			if (obj == null)
				return null;
			var model = new ExpenditureModel
			{
				Id = obj.Id,
				Name = obj.Name,
				CategoriesCount = obj.ExpenditureCategory.Count
			};
			model.TrimStringProperties();
			return model;
		}

		/// <summary>
		/// Copies data from model to DAL object.
		/// </summary>
		/// <param name="dbObj">A target DAL object.</param>
		public void CopyTo(Expenditure dbObj)
		{
			if (dbObj == null)
				throw new ArgumentNullException();

			dbObj.Name = Name;
		}
	}
}