using System.ComponentModel.DataAnnotations;

namespace Domain.Entities.Stocks;

/// <summary>
/// SEIBro 단기금융증권 발행내역 (getShortmIssuInfo) — CD/CP/전단채 발행종목 (Wave 4). 자연키 UNIQUE (Isin).
/// CdMaster/CpMaster/EstbMaster rolling 의 발견 소스 — 발행일(ISSU_DT) × 종목구분(SECN_TPCD{12,13,14}) 날짜 스윕.
/// 응답에 없는 SecnTpcd·IssuDt 는 요청 파라미터를 배치가 스탬핑한다.
/// </summary>
public class ShortTermIssuance
{
    [Key]
    public int ID { get; private set; }

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

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

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

    /// <summary>발행회사 명칭 (ISSUCO_CUST_NM)</summary>
    public string? IssucoCustNm { get; private set; }

    /// <summary>종목구분코드 (SECN_TPCD, 요청값 스탬핑) — 12어음(CP) 13CD 14전자단기사채</summary>
    public string SecnTpcd { get; private set; } = default!;

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

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

    private ShortTermIssuance() { }

    public static ShortTermIssuance Create(string isin, string? korSecnNm, int? issucoCustno, string? issucoCustNm, string secnTpcd, DateOnly issuDt)
    {
        if (string.IsNullOrWhiteSpace(isin))
        {
            throw new ArgumentException("isin required", nameof(isin));
        }

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

        return new ShortTermIssuance
        {
            Isin = isin.Trim(),
            KorSecnNm = Trimmed(korSecnNm),
            IssucoCustno = issucoCustno,
            IssucoCustNm = Trimmed(issucoCustNm),
            SecnTpcd = secnTpcd.Trim(),
            IssuDt = issuDt
        };
    }

    /// <summary>재수집 반영 — 변경 필드가 있을 때만 UpdatedAt 갱신 (자연키 Isin 은 불변)</summary>
    public void Update(string? korSecnNm, int? issucoCustno, string? issucoCustNm, string secnTpcd, DateOnly issuDt)
    {
        var changed = false;

        changed |= Set(Trimmed(korSecnNm), KorSecnNm, v => KorSecnNm = v);
        changed |= Set(issucoCustno, IssucoCustno, v => IssucoCustno = v);
        changed |= Set(Trimmed(issucoCustNm), IssucoCustNm, v => IssucoCustNm = v);
        changed |= Set(secnTpcd.Trim(), SecnTpcd, v => SecnTpcd = v);
        changed |= Set(issuDt, IssuDt, v => IssuDt = 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;
    }
}