using System.ComponentModel.DataAnnotations;

namespace Domain.Entities.Stocks;

/// <summary>
/// SEIBro 종목별 외화증권 결제현황 (getSecnFrsecSetlInfo) — KSD 를 통한 특정 외화종목(ISIN)의 매수/매도 결제신청수량·금액(USD) (Wave 6). 자연키 UNIQUE (ProcDt, Isin, IntlBizCacd).
/// 응답 필드는 NationCd·SecnTpcd·IntlBizCacd·SetlAskQty·SetlAmt 5종 — 배치가 PROC_DT·ISIN 을 요청값으로 스탬핑한다.
/// PROC_DT = 결제처리일(한국시간) — 미국시간 T일 결제는 처리일 T+1 반영. IntlBizCacd = 1110매수/1120매도. ForeignIsins 기본 빈 리스트라 사실상 대기.
/// </summary>
public class ForeignSettlementSecurity
{
    [Key]
    public int ID { get; private set; }

    /// <summary>결제처리일 (PROC_DT, 요청값 스탬핑, 한국시간)</summary>
    public DateOnly ProcDt { get; private set; }

    /// <summary>종목코드 (ISIN, 요청값 스탬핑)</summary>
    public string Isin { get; private set; } = default!;

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

    /// <summary>국가코드 (NATION_CD)</summary>
    public string? NationCd { get; private set; }

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

    /// <summary>결제신청수량 (SETL_ASK_QTY) — 주식:주, 채권:액면금액</summary>
    public decimal? SetlAskQty { get; private set; }

    /// <summary>결제금액 (SETL_AMT) — USD</summary>
    public decimal? SetlAmt { get; private set; }

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

    private ForeignSettlementSecurity() { }

    public static ForeignSettlementSecurity Create(DateOnly procDt, string isin, string intlBizCacd, string? nationCd, string? secnTpcd, decimal? setlAskQty, decimal? setlAmt)
    {
        if (string.IsNullOrWhiteSpace(isin))
        {
            throw new ArgumentException("isin required", nameof(isin));
        }

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

        return new ForeignSettlementSecurity
        {
            ProcDt = procDt,
            Isin = isin.Trim(),
            IntlBizCacd = intlBizCacd.Trim(),
            NationCd = Trimmed(nationCd),
            SecnTpcd = Trimmed(secnTpcd),
            SetlAskQty = setlAskQty,
            SetlAmt = setlAmt
        };
    }

    /// <summary>재수집 반영 — 변경 필드가 있을 때만 UpdatedAt 갱신 (자연키 ProcDt/Isin/IntlBizCacd 은 불변)</summary>
    public void Update(string? nationCd, string? secnTpcd, decimal? setlAskQty, decimal? setlAmt)
    {
        var changed = false;

        changed |= Set(Trimmed(nationCd), NationCd, v => NationCd = v);
        changed |= Set(Trimmed(secnTpcd), SecnTpcd, v => SecnTpcd = v);
        changed |= Set(setlAskQty, SetlAskQty, v => SetlAskQty = v);
        changed |= Set(setlAmt, SetlAmt, v => SetlAmt = v);

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

    private static string? Trimmed(string? value)
    {
        return string.IsNullOrWhiteSpace(value) ? null : value.Trim();
    }

    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;
    }
}