using System.ComponentModel.DataAnnotations;

namespace Domain.Entities.Stocks;

/// <summary>
/// SEIBro 국가별 외화증권 결제현황 (getNationFrsecSetlInfo) — KSD 를 통한 외화증권 매수/매도 결제건수·금액(USD), 국가×매매구분×종목구분별 (Wave 6).
/// 자연키 UNIQUE (SetlDt, NationCd, IntlBizCacd, SecnTpcd). 응답 필드는 IntlBizCacd·SecnTpcd·SetlCount·FrsecSetlAmt 4종 — 배치가 SETL_DT·NATION_CD 를 요청값으로 스탬핑한다.
/// IntlBizCacd(국제업무분류) = 1110매수 / 1120매도. 외화 결제는 미국시간 T일 결제가 처리일 T+1 반영(getSecnFrsecSetlInfo 주석 참고)이라 결제일 스윕은 T+1 지연을 감안한다.
/// </summary>
public class ForeignSettlementNation
{
    [Key]
    public int ID { get; private set; }

    /// <summary>결제일자 (SETL_DT, 요청값 스탬핑)</summary>
    public DateOnly SetlDt { get; private set; }

    /// <summary>국가코드 (NATION_CD, 요청값 스탬핑) — US/JP/HK/CN/E1 등 43종</summary>
    public string NationCd { get; private set; } = default!;

    /// <summary>국제업무분류코드 (INTL_BIZ_CACD) — 1110매수 1120매도</summary>
    public string IntlBizCacd { get; private set; } = default!;

    /// <summary>종목구분코드 (SECN_TPCD) — 71외화주식~78외화수익증권</summary>
    public string SecnTpcd { get; private set; } = default!;

    /// <summary>결제건수 (SETL_COUNT)</summary>
    public long? SetlCount { get; private set; }

    /// <summary>외화증권결제금액 (FRSEC_SETL_AMT) — USD</summary>
    public decimal? FrsecSetlAmt { get; private set; }

    public DateTime UpdatedAt { get; private set; } = DateTime.UtcNow;

    private ForeignSettlementNation() { }

    public static ForeignSettlementNation Create(DateOnly setlDt, string nationCd, string intlBizCacd, string secnTpcd, long? setlCount, decimal? frsecSetlAmt)
    {
        if (string.IsNullOrWhiteSpace(nationCd))
        {
            throw new ArgumentException("nationCd required", nameof(nationCd));
        }

        if (string.IsNullOrWhiteSpace(intlBizCacd))
        {
            throw new ArgumentException("intlBizCacd required", nameof(intlBizCacd));
        }

        if (string.IsNullOrWhiteSpace(secnTpcd))
        {
            throw new ArgumentException("secnTpcd required", nameof(secnTpcd));
        }

        return new ForeignSettlementNation
        {
            SetlDt = setlDt,
            NationCd = nationCd.Trim(),
            IntlBizCacd = intlBizCacd.Trim(),
            SecnTpcd = secnTpcd.Trim(),
            SetlCount = setlCount,
            FrsecSetlAmt = frsecSetlAmt
        };
    }

    /// <summary>재수집 반영 — 변경 필드가 있을 때만 UpdatedAt 갱신 (자연키 SetlDt/NationCd/IntlBizCacd/SecnTpcd 은 불변)</summary>
    public void Update(long? setlCount, decimal? frsecSetlAmt)
    {
        var changed = false;

        changed |= Set(setlCount, SetlCount, v => SetlCount = v);
        changed |= Set(frsecSetlAmt, FrsecSetlAmt, v => FrsecSetlAmt = v);

        if (changed)
        {
            UpdatedAt = DateTime.UtcNow;
        }
    }

    private static bool Set<T>(T incoming, T current, Action<T> assign)
    {
        if (EqualityComparer<T>.Default.Equals(incoming, current))
        {
            return false;
        }

        assign(incoming);
        return true;
    }
}