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

namespace EnVisage.Models
{
	public class AttachmentModel : IBaseModel<Attachment>
    {
        public Guid Id { get; set; }
		public string Name { get; set; }
		public int Size { get; set; }
		public string ContentType { get; set; }
		public bool IsNew { get; set; }
        public bool IsLink { get; set; }
        public string Link { get; set; }

        /// <summary>
        /// Casts a <see cref="Attachment"/> obect to the object of type <see cref="AttachmentModel"/>.
        /// </summary>
        /// <param name="obj">An <see cref="Attachment"/> object</param>
        /// <returns>A <see cref="AttachmentModel"/> object filled with data from db</returns>
        public static explicit operator AttachmentModel(Attachment obj)
        {
            if (obj == null)
                return null;
            bool islink = false;
           
            if (!string.IsNullOrEmpty(obj.Link)) {
                islink = true;
              
            }
            var model = new AttachmentModel
            {
                Id = obj.Id,
                Name = obj.SourceFileName,
                Size = obj.FileSize.HasValue ? obj.FileSize.Value : 0,
                ContentType = obj.ContentType,
                IsNew = false,
                IsLink = islink,
                Link = obj.Link
            };
            model.TrimStringProperties();
            return model;
        }

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

			dbObj.Id = Id;
			dbObj.SourceFileName = Name;
			dbObj.ContentType = ContentType;
			dbObj.FileSize = Size;
            dbObj.Link = (Link !=null?Link.ToString():string.Empty);
        }
        public AttachmentModel Copy()
        {
            return new AttachmentModel()
            {
                Id = Guid.NewGuid(),
                IsNew = true,
                Link = this.Link,
                IsLink = this.IsLink,
                ContentType = this.ContentType,
                Name = this.Name,
                Size = this.Size
            };
        }
    }
}