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

namespace MoneyMap.Models;

public class Transfer
{
    [Key]
    public long Id { get; set; }

    [Required]
    public DateTime Date { get; set; }

    [Required]
    [Column(TypeName = "decimal(18,2)")]
    public decimal Amount { get; set; } // Always positive

    [MaxLength(500)]
    public string Description { get; set; } = string.Empty;

    public string Notes { get; set; } = string.Empty;

    // Source account (where money comes from) - nullable for "Unknown"
    [ForeignKey(nameof(SourceAccount))]
    public int? SourceAccountId { get; set; }
    public Account? SourceAccount { get; set; }

    // Destination account (where money goes to) - nullable for "Unknown"
    [ForeignKey(nameof(DestinationAccount))]
    public int? DestinationAccountId { get; set; }
    public Account? DestinationAccount { get; set; }

    // Optional link to original transaction if imported from CSV
    [ForeignKey(nameof(OriginalTransaction))]
    public long? OriginalTransactionId { get; set; }
    public Transaction? OriginalTransaction { get; set; }

    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;

    [NotMapped]
    public string SourceLabel => SourceAccount != null
        ? $"{SourceAccount.Institution} {SourceAccount.Last4}"
        : "Unknown";

    [NotMapped]
    public string DestinationLabel => DestinationAccount != null
        ? $"{DestinationAccount.Institution} {DestinationAccount.Last4}"
        : "Unknown";
}