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

namespace EnVisage.Models
{
    public class ClientModel : IBaseModel<Client>
    {
        public Guid Id { get; set; }
        [Required]
        [MaxLength(100, ErrorMessage = "Client name should not exceed 100 characters")]
        public string Name { get; set; }

        public Guid? GLAccountId { get; set; }
        [Display(Name = "GL Account")]
        public GLAccountModel GLAccount { get; set; }

        [Display(Name = "Number")]
        public string ClientNumber { get; set; }

		[Display(Name = "Number of Projects")]
        public int ProjectsCount { get; set; }
        public List<ContactModel> Contacts
        {
            get
            {
                List<ContactModel> result = new List<ContactModel>();
                EnVisageEntities DbContext = new EnVisageEntities();
                var contacts = (from c in DbContext.Contacts where c.ParentId == Id select c).ToList();
                foreach (var contact in contacts)
                    result.Add((ContactModel)contact);
                return result;
            }
            set { }
        }
        public List<CompanyModel> Companies
        {
            get
            {
                List<CompanyModel> result = new List<CompanyModel>();
                EnVisageEntities DbContext = new EnVisageEntities();
                var companies = (from c in DbContext.Companies where c.ParentCompanyId != null select c).ToList();
                foreach (var company in companies)
                    result.Add((CompanyModel)company);

                return result.OrderBy(x => x.ParentCompanyName).ToList();
            }
            set { }
        }
        public IList<Guid> CompanyId { get; set; }
        public IList<string> Company { get; set; }
        /// <summary>
        /// Casts a <see cref="Client"/> obect to the object of type <see cref="ClientModel"/>.
        /// </summary>
        /// <param name="obj">A <see cref="Client"/> object.</param>
        /// <returns>A <see cref="ClientModel"/> object filled with data from db.</returns>
        public static explicit operator ClientModel(Client obj)
        {
            if (obj == null)
                return null;
            var model = new ClientModel
            {
                Id = obj.Id,
                Name = obj.Name,
                GLAccountId = obj.GLAccountId,
                ClientNumber = obj.ClientNumber,
                GLAccount = (GLAccountModel)obj.GLAccount,
                ProjectsCount = obj.Projects.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(Client dbObj)
        {
            if (dbObj == null)
                throw new ArgumentNullException();

            dbObj.Name = Name;
            dbObj.GLAccountId = GLAccountId;
            dbObj.ClientNumber = ClientNumber; 
        }
    }

    /// <summary>
    /// An UI representation of client to be displayed as list items
    /// </summary>
    public class ClientListModel
    {
        public Guid Id { get; set; }
        public string Name { get; set; }
        public string ClientNumber { get; set; }
        public int ProjectsCount { get; set; }
        public IList<string> Companies { get; set; }
        public string GlAccount { get; set; }
    }
}