using System.ComponentModel.DataAnnotations;

namespace Domain.Entities.Stocks;

/// <summary>
/// SEIBro CD 종목 정보 (getCDInfo) — 발행금액·할인율·이자지급방식·만기 (Wave 4). PK Isin.
/// ⚠️ 실샘플 fixture 가 result="0"(빈) 이라 필드 매핑은 채권.md 스펙 기준 — 운영 첫 수집 시 로그로 확인.
/// rolling per-ISIN 대상 = ShortTermIssuance 발견분 중 SECN_TPCD=13(CD).
/// </summary>
public class CdMaster
{
    /// <summary>종목코드 (ISIN) — PK</summary>
    [Key]
    [MaxLength(12)]
    public string Isin { get; private set; } = default!;

    /// <summary>발행사 번호 (ISSUCO_CUSTNO)</summary>
    public int? IssucoCustno { get; private set; }

    /// <summary>한글종목명 (KOR_SECN_NM)</summary>
    public string? KorSecnNm { get; private set; }

    /// <summary>발행통화코드 (ISSU_CUR_CD) — KRW</summary>
    public string? IssuCurCd { get; private set; }

    /// <summary>최초발행금액 (FIRST_ISSU_AMT)</summary>
    public decimal? FirstIssuAmt { get; private set; }

    /// <summary>발행방법코드 (ISSU_WHCD)</summary>
    public string? IssuWhcd { get; private set; }

    /// <summary>액면금액 (FACE_AMT)</summary>
    public decimal? FaceAmt { get; private set; }

    /// <summary>매출금액 (SALE_AMT)</summary>
    public decimal? SaleAmt { get; private set; }

    /// <summary>할인율 (DISCN_RATE)</summary>
    public decimal? DiscnRate { get; private set; }

    /// <summary>이자지급방식구분코드 (INT_PAY_MANN_TPCD) — 1할인식 2부리식</summary>
    public string? IntPayMannTpcd { get; private set; }

    /// <summary>발행일자 (ISSU_DT)</summary>
    public DateOnly? IssuDt { get; private set; }

    /// <summary>만기일자 (XPIR_DT) — CD 상환일</summary>
    public DateOnly? XpirDt { get; private set; }

    /// <summary>전자증권 여부 (ELTSC_YN)</summary>
    public bool? EltscYn { get; private set; }

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

    private CdMaster() { }

    public static CdMaster Create(
        string isin,
        int? issucoCustno,
        string? korSecnNm,
        string? issuCurCd,
        decimal? firstIssuAmt,
        string? issuWhcd,
        decimal? faceAmt,
        decimal? saleAmt,
        decimal? discnRate,
        string? intPayMannTpcd,
        DateOnly? issuDt,
        DateOnly? xpirDt,
        bool? eltscYn)
    {
        if (string.IsNullOrWhiteSpace(isin))
        {
            throw new ArgumentException("isin required", nameof(isin));
        }

        var entity = new CdMaster { Isin = isin.Trim() };
        entity.Apply(issucoCustno, korSecnNm, issuCurCd, firstIssuAmt, issuWhcd, faceAmt, saleAmt, discnRate, intPayMannTpcd, issuDt, xpirDt, eltscYn);
        return entity;
    }

    /// <summary>재수집 반영 (PK Isin 은 불변) — 변경 시에만 UpdatedAt</summary>
    public void Update(
        int? issucoCustno,
        string? korSecnNm,
        string? issuCurCd,
        decimal? firstIssuAmt,
        string? issuWhcd,
        decimal? faceAmt,
        decimal? saleAmt,
        decimal? discnRate,
        string? intPayMannTpcd,
        DateOnly? issuDt,
        DateOnly? xpirDt,
        bool? eltscYn)
    {
        Apply(issucoCustno, korSecnNm, issuCurCd, firstIssuAmt, issuWhcd, faceAmt, saleAmt, discnRate, intPayMannTpcd, issuDt, xpirDt, eltscYn);
    }

    private void Apply(
        int? issucoCustno,
        string? korSecnNm,
        string? issuCurCd,
        decimal? firstIssuAmt,
        string? issuWhcd,
        decimal? faceAmt,
        decimal? saleAmt,
        decimal? discnRate,
        string? intPayMannTpcd,
        DateOnly? issuDt,
        DateOnly? xpirDt,
        bool? eltscYn)
    {
        var changed = false;

        changed |= Set(issucoCustno, IssucoCustno, v => IssucoCustno = v);
        changed |= Set(Trimmed(korSecnNm), KorSecnNm, v => KorSecnNm = v);
        changed |= Set(Trimmed(issuCurCd), IssuCurCd, v => IssuCurCd = v);
        changed |= Set(firstIssuAmt, FirstIssuAmt, v => FirstIssuAmt = v);
        changed |= Set(Trimmed(issuWhcd), IssuWhcd, v => IssuWhcd = v);
        changed |= Set(faceAmt, FaceAmt, v => FaceAmt = v);
        changed |= Set(saleAmt, SaleAmt, v => SaleAmt = v);
        changed |= Set(discnRate, DiscnRate, v => DiscnRate = v);
        changed |= Set(Trimmed(intPayMannTpcd), IntPayMannTpcd, v => IntPayMannTpcd = v);
        changed |= Set(issuDt, IssuDt, v => IssuDt = v);
        changed |= Set(xpirDt, XpirDt, v => XpirDt = v);
        changed |= Set(eltscYn, EltscYn, v => EltscYn = 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;
    }
}