using System.ComponentModel.DataAnnotations;

namespace Domain.Entities.Stocks;

/// <summary>
/// SEIBro 상호변경 정보 (getFmnmAltInfo) — 사명 변경 전후·혼용유통기간 (Wave 3).
/// 자연키 UNIQUE (IssucoCustno, RgtStdDt) — 한 회사·권리기준일당 1행.
/// 이벤트 구동: RightsBaseDate 의 RGT_RACD=204(상호변경) 인 (회사번호, 기준일)을 트리거로 수집한다.
/// </summary>
public class CorpNameChange
{
    [Key]
    public int ID { get; private set; }

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

    /// <summary>권리기준일자 (RGT_STD_DT)</summary>
    public DateOnly RgtStdDt { get; private set; }

    /// <summary>변경전상호(국문, FMNM_BFALT_KOR_NM)</summary>
    public string? FmnmBfaltKorNm { get; private set; }

    /// <summary>변경전상호(영문, FMNM_BFALT_ENG_NM)</summary>
    public string? FmnmBfaltEngNm { get; private set; }

    /// <summary>변경후상호(국문, FMNM_ALT_KOR_NM)</summary>
    public string? FmnmAltKorNm { get; private set; }

    /// <summary>변경후상호(영문, FMNM_ALT_ENG_NM)</summary>
    public string? FmnmAltEngNm { get; private set; }

    /// <summary>혼용유통시작일자 (MIXUS_CIRCL_BEGIN_DT)</summary>
    public DateOnly? MixusCirclBeginDt { get; private set; }

    /// <summary>혼용유통종료일자 (MIXUS_CIRCL_EXPRY_DT)</summary>
    public DateOnly? MixusCirclExpryDt { get; private set; }

    /// <summary>단일유통일자 (UNI_CIRCL_DT)</summary>
    public DateOnly? UniCirclDt { get; private set; }

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

    private CorpNameChange() { }

    public static CorpNameChange Create(
        int issucoCustno,
        DateOnly rgtStdDt,
        string? fmnmBfaltKorNm,
        string? fmnmBfaltEngNm,
        string? fmnmAltKorNm,
        string? fmnmAltEngNm,
        DateOnly? mixusCirclBeginDt,
        DateOnly? mixusCirclExpryDt,
        DateOnly? uniCirclDt)
    {
        return new CorpNameChange
        {
            IssucoCustno = issucoCustno,
            RgtStdDt = rgtStdDt,
            FmnmBfaltKorNm = Trimmed(fmnmBfaltKorNm),
            FmnmBfaltEngNm = Trimmed(fmnmBfaltEngNm),
            FmnmAltKorNm = Trimmed(fmnmAltKorNm),
            FmnmAltEngNm = Trimmed(fmnmAltEngNm),
            MixusCirclBeginDt = mixusCirclBeginDt,
            MixusCirclExpryDt = mixusCirclExpryDt,
            UniCirclDt = uniCirclDt
        };
    }

    /// <summary>재수집 반영 — 변경 필드가 있을 때만 UpdatedAt 갱신 (자연키는 불변)</summary>
    public void Update(
        string? fmnmBfaltKorNm,
        string? fmnmBfaltEngNm,
        string? fmnmAltKorNm,
        string? fmnmAltEngNm,
        DateOnly? mixusCirclBeginDt,
        DateOnly? mixusCirclExpryDt,
        DateOnly? uniCirclDt)
    {
        var changed = false;

        changed |= Set(Trimmed(fmnmBfaltKorNm), FmnmBfaltKorNm, v => FmnmBfaltKorNm = v);
        changed |= Set(Trimmed(fmnmBfaltEngNm), FmnmBfaltEngNm, v => FmnmBfaltEngNm = v);
        changed |= Set(Trimmed(fmnmAltKorNm), FmnmAltKorNm, v => FmnmAltKorNm = v);
        changed |= Set(Trimmed(fmnmAltEngNm), FmnmAltEngNm, v => FmnmAltEngNm = v);
        changed |= Set(mixusCirclBeginDt, MixusCirclBeginDt, v => MixusCirclBeginDt = v);
        changed |= Set(mixusCirclExpryDt, MixusCirclExpryDt, v => MixusCirclExpryDt = v);
        changed |= Set(uniCirclDt, UniCirclDt, v => UniCirclDt = 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;
    }
}