using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Reflection;
using EveryThing.Models.CodeTable;

namespace EveryThing.Models.Invoice
{
    public class Invoice
    {
        public class InvoiceStateAttribute : Attribute
        {
            public string AllowedTypes { get; set; } = "0,1,2,3,4";
        }

        public enum InvoiceType
        {
            [Display(Name = "Račun", ShortName = "Racun")]
            Invoice = 0,
            [Display(Name = "Naročilo", ShortName = "Narocilo")]
            Order = 1,
            [Display(Name = "Dobavnica", ShortName = "Dobavnica")]
            DeliveryNote = 2,
            [Display(Name = "Naročilo kupca", ShortName = "Narocilo")]
            BuyersOrder = 3,
            [Display(Name = "Kooperacija", ShortName = "Kooperacija")]
            Cooperation = 4,
        }

        public enum InvoiceState
        {
            [Display(Name = "Nov")]
            [InvoiceState]
            New = 0,
            [Display(Name = "Povpraševanje")]
            [InvoiceState(AllowedTypes = "1")]
            Inquiry = 1,
            [Display(Name = "Ponudba")]
            [InvoiceState(AllowedTypes = "3")]
            Offer = 2,
            [Display(Name = "Potrjen")]
            [InvoiceState]
            Confirmed = 10,
            [Display(Name = "Potrditev naročila")]
            [InvoiceState(AllowedTypes = "3")]
            OfferConfirmation = 15,
            [Display(Name = "Zaprt")]
            [InvoiceState]
            Closed = 20
        }

        [Key]
        public int IdInvoice { get; set; }

        [Required]
        [ForeignKey("Company")]
        public int IdCompanyFk { get; set; }

        [Required]
        [Display(Name = "Datum")]
        [DisplayFormat(DataFormatString = "{0:dd.MM.yyyy}", ApplyFormatInEditMode = true)]
        public DateTime Date { get; set; }

        [Required]
        [Display(Name = "Tip")]
        public InvoiceType Type { get; set; }


        [Required]
        [Display(Name = "Status")]
        public InvoiceState State { get; set; } = InvoiceState.New;
        
        [Required]
        [ForeignKey("Partner")]
        [Display(Name = "Partner")]
        public int? IdPartnerFk { get; set; }

        [ForeignKey("Projekt")]
        [Display(Name = "Projekt")]
        public int? IdProjectFk { get; set; }

        [Required]
        public int InvoiceNumber { get; set; }

        [Required]
        public int InvoiceYear { get; set; }

        [Display(Name = "Uvodno besedilo")]
        public string PreText { get; set; }

        [Display(Name = "Zaključno besedilo")]
        public string PostText { get; set; }

        [Display(Name = "Opomba")]
        public string Note { get; set; }

        [Display(Name = "Številka naročila kupca")]
        public string BuyersOrderNumber { get; set; }

        /// <summary>
        /// Dobavnica/racun  => datum odpreme
        /// Narocilo => dobavni rok
        /// </summary>
        [Display(Name = "Datum odpreme")]
        [DisplayFormat(DataFormatString = "{0:dd.MM.yyyy}", ApplyFormatInEditMode = true)]
        public DateTime? DateOfDispatch { get; set; }

        [NotMapped]
        public string InvoiceNumberFormatted => $"{InvoiceYear}-{InvoiceNumber}";

        [NotMapped]
        public string InvoiceTypeString
        {
            get
            {
                if (Type == InvoiceType.BuyersOrder && State == InvoiceState.Offer)
                {
                    return "Ponudba";
                }

                if (Type == InvoiceType.BuyersOrder && State == InvoiceState.OfferConfirmation)
                {
                    return "Potrditev_narocila";
                }

                if (Type == InvoiceType.Order && State == InvoiceState.Inquiry)
                {
                    return "Povprasevanje";
                }

                return Type.GetType().GetMember(Type.ToString()).First().GetCustomAttribute<DisplayAttribute>()?.ShortName;
            }
        }

        [NotMapped]
        public string InvoiceNumberFull => $"{InvoiceTypeString}-{InvoiceNumberFormatted}";

        [NotMapped] public string InvoiceTypeHeaderString => GetInvoiceTypeHeaderString(Type);

        // ForeignKey
        public CodeTableCompany Company { get; set; }

        public CodeTablePartner Partner { get; set; }
        public Project.Project Project{ get; set; }

        // InvoicePart
        [InverseProperty("Invoice")]
        public virtual ICollection<InvoiceItem> InvoiceInvoiceItem { get; set; }

        public static string GetInvoiceTypeHeaderString(InvoiceType iType)
        {
            return iType switch
            {
                InvoiceType.Order => "Naročila dobaviteljem",
                0 => "Računi",
                InvoiceType.DeliveryNote => "Dobavnice",
                InvoiceType.BuyersOrder => "Naročila kupcev",
                InvoiceType.Cooperation => "Kooperacije",
                _ => "Fakture"
            };
        }
    }
}