using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace MoneyMap.Models;

public class Card
{
    [Key]
    public int Id { get; set; }

    [Required]
    [MaxLength(100)]
    public string Issuer { get; set; } = string.Empty;   // e.g., VISA, MC, Discover

    [Required]
    [MaxLength(4)]
    public string Last4 { get; set; } = string.Empty;    // "1234"

    [Required]
    [MaxLength(100)]
    public string Owner { get; set; } = string.Empty;

    // Link to the account this card draws from/pays to
    [ForeignKey(nameof(Account))]
    public int? AccountId { get; set; }
    public Account? Account { get; set; }

    [MaxLength(50)]
    public string? Nickname { get; set; } // Optional friendly name

    public ICollection<Transaction> Transactions { get; set; } = new List<Transaction>();

    [NotMapped]
    public string DisplayLabel => string.IsNullOrEmpty(Nickname)
        ? $"{Issuer} {Last4}"
        : $"{Nickname} ({Issuer} {Last4})";
}