using System.ComponentModel.DataAnnotations;

namespace Domain.Entities.Stocks;

/// <summary>
/// SEIBro 주식관련사채 행사대상 주식정보 (getXrcStkStatInfo) — CB/BW/EB 행사대상·행사가·행사비율 (Wave 3).
/// 자연키 UNIQUE (BondIsin, XrcStkIsin) — 한 채권·행사주식 조합당 1행.
/// rolling per-채권ISIN — 발견 소스는 ConvertibleExercise(getXrcStkOptionXrcInfo) 가 반환한 DISTINCT BOND_ISIN.
/// ⚠️ getXrcStkStatInfo 실샘플이 result="0"(0행) 이라 필드 매핑은 주식.md 스펙 기준 — 운영 첫 수집 시 로그로 확인 필요.
/// </summary>
public class ConvertibleBondTarget
{
    [Key]
    public int ID { get; private set; }

    /// <summary>채권 종목번호 (BOND_ISIN) — EB/BW/CB</summary>
    public string BondIsin { get; private set; } = default!;

    /// <summary>채권 종목명 (BOND_SECN_NM)</summary>
    public string? BondSecnNm { get; private set; }

    /// <summary>채권종류코드 (BOND_KIND_NM) — EB/CB/분리형BW/비분리형BW</summary>
    public string? BondKindNm { get; private set; }

    /// <summary>행사주식종목번호 (XRC_STK_ISIN)</summary>
    public string XrcStkIsin { get; private set; } = default!;

    /// <summary>주식 종목명 (STK_SECN_NM)</summary>
    public string? StkSecnNm { get; private set; }

    /// <summary>신주인수권증권종목번호 (WRTB_ISIN)</summary>
    public string? WrtbIsin { get; private set; }

    /// <summary>신주인수권증권명 (WRTB_SECN_NM)</summary>
    public string? WrtbSecnNm { get; private set; }

    /// <summary>행사비율 (XRC_RATIO)</summary>
    public decimal? XrcRatio { get; private set; }

    /// <summary>행사가격 (XRC_PRICE)</summary>
    public decimal? XrcPrice { get; private set; }

    /// <summary>결산기말제한일수 (SETACC_ENDTERM_LIMIT_DAYS)</summary>
    public int? SetaccEndtermLimitDays { get; private set; }

    /// <summary>신주배정일전제한일수 (NEWSTK_ALOC_DD_BF_LIMIT_DAYS)</summary>
    public int? NewstkAllocDdBfLimitDays { get; private set; }

    /// <summary>청구제한사유내용 (DMAN_LIMIT_RSN_CONTENT)</summary>
    public string? DmanLimitRsnContent { get; private set; }

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

    private ConvertibleBondTarget() { }

    public static ConvertibleBondTarget Create(
        string bondIsin,
        string? bondSecnNm,
        string? bondKindNm,
        string xrcStkIsin,
        string? stkSecnNm,
        string? wrtbIsin,
        string? wrtbSecnNm,
        decimal? xrcRatio,
        decimal? xrcPrice,
        int? setaccEndtermLimitDays,
        int? newstkAllocDdBfLimitDays,
        string? dmanLimitRsnContent)
    {
        if (string.IsNullOrWhiteSpace(bondIsin))
        {
            throw new ArgumentException("bondIsin required", nameof(bondIsin));
        }

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

        return new ConvertibleBondTarget
        {
            BondIsin = bondIsin.Trim(),
            BondSecnNm = Trimmed(bondSecnNm),
            BondKindNm = Trimmed(bondKindNm),
            XrcStkIsin = xrcStkIsin.Trim(),
            StkSecnNm = Trimmed(stkSecnNm),
            WrtbIsin = Trimmed(wrtbIsin),
            WrtbSecnNm = Trimmed(wrtbSecnNm),
            XrcRatio = xrcRatio,
            XrcPrice = xrcPrice,
            SetaccEndtermLimitDays = setaccEndtermLimitDays,
            NewstkAllocDdBfLimitDays = newstkAllocDdBfLimitDays,
            DmanLimitRsnContent = Trimmed(dmanLimitRsnContent)
        };
    }

    /// <summary>재수집 반영 — 변경 필드가 있을 때만 UpdatedAt 갱신 (자연키는 불변)</summary>
    public void Update(
        string? bondSecnNm,
        string? bondKindNm,
        string? stkSecnNm,
        string? wrtbIsin,
        string? wrtbSecnNm,
        decimal? xrcRatio,
        decimal? xrcPrice,
        int? setaccEndtermLimitDays,
        int? newstkAllocDdBfLimitDays,
        string? dmanLimitRsnContent)
    {
        var changed = false;

        changed |= Set(Trimmed(bondSecnNm), BondSecnNm, v => BondSecnNm = v);
        changed |= Set(Trimmed(bondKindNm), BondKindNm, v => BondKindNm = v);
        changed |= Set(Trimmed(stkSecnNm), StkSecnNm, v => StkSecnNm = v);
        changed |= Set(Trimmed(wrtbIsin), WrtbIsin, v => WrtbIsin = v);
        changed |= Set(Trimmed(wrtbSecnNm), WrtbSecnNm, v => WrtbSecnNm = v);
        changed |= Set(xrcRatio, XrcRatio, v => XrcRatio = v);
        changed |= Set(xrcPrice, XrcPrice, v => XrcPrice = v);
        changed |= Set(setaccEndtermLimitDays, SetaccEndtermLimitDays, v => SetaccEndtermLimitDays = v);
        changed |= Set(newstkAllocDdBfLimitDays, NewstkAllocDdBfLimitDays, v => NewstkAllocDdBfLimitDays = v);
        changed |= Set(Trimmed(dmanLimitRsnContent), DmanLimitRsnContent, v => DmanLimitRsnContent = 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;
    }
}