using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using static EveryThing.Models.Invoice.Invoice;

namespace EveryThing.Models.Invoice
{
    public class InvoiceItem
    {
        public enum InvoiceItemState
        {
            [Display(Name = "Novo")]
            New = 0,
            [Display(Name = "Potrjeno")]
            Confirmed = 10,
            [Display(Name = "Zaprto")]
            Closed = 50
        }

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

        [Required]
        [ForeignKey("Invoice")]
        public int IdInvoiceFk { get; set; }

        [ForeignKey("ProjectPartItem")]
        public int? IdProjectPartItem { get; set; }

        [ForeignKey("Item")]
        [Display(Name = "Artikel")]
        public int? IdItemFk { get; set; }

        [ForeignKey("InvoiceItemJoin")]
        [Display(Name = "Pozicija")]
        public int? IdInvoiceItemJoinFk { get; set; }

        [Display(Name = "Opis pozicije")]
        public string ItemDescription { get; set; }

        [Display(Name = "Artikel")]
        public string UnlistedItem { get; set; }

        [NotMapped] public string ItemDisplay => Item?.Title ?? UnlistedItem;

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

        [Display(Name = "Količina")]
        [DisplayFormat(DataFormatString = "{0:#,###,##0.00}", ApplyFormatInEditMode = true)]
        public double Quantity { get; set; }

        [Display(Name = "Cena")]
        [DisplayFormat(DataFormatString = "{0:#,###,##0.00}", ApplyFormatInEditMode = true)]
        public double Price { get; set; }

        [Display(Name = "Rabat")]
        [DisplayFormat(DataFormatString = "{0:#,###,##0.00}", ApplyFormatInEditMode = true)]
        public double Discount { get; set; }

        [Display(Name = "DDV")]
        public double Tax { get; set; }

        [Required]
        [Display(Name = "Status")]
        public InvoiceItemState State { get; set; } = InvoiceItemState.New;

        [NotMapped]
        [Display(Name = "Skupaj")]
        [DisplayFormat(DataFormatString = "{0:#,###,##0.00}", ApplyFormatInEditMode = true)]
        public double TotalValue => Math.Round((Price * (100 - Discount) / 100) * Quantity, 2);

        // ForeignKey
        public Invoice Invoice { get; set; }

        public CodeTable.CodeTableItem Item { get; set; }
        /// <summary>
        /// Povezana pozicija fakture, npr ko se iz dob naredi racun
        /// </summary>
        public InvoiceItem InvoiceItemJoin { get; set; }
    }
}