using System.ComponentModel.DataAnnotations;

namespace Domain.Entities.Stocks;

/// <summary>
/// SEIBro 파생결합증권 상환조건 (getRedCondiInfo) — 중간평가일·상환조건·계산식 (Wave 5). 자연키 UNIQUE (Isin, RedCondiTpcd, ValatNtimesSeq).
/// rolling per-ISIN(DerivMaster 있는 것). 상환조건구분(1중간평가/2만기)×평가횟수(ValatNtimesSeq)별 조건문·계산식 다수 행.
/// ⚠️ 응답에 ISIN 이 없어(요청 파라미터로만 받음) 배치가 요청 ISIN 을 스탬핑한다.
/// 조건/계산식은 최대 1000자 자유 텍스트(VARCHAR2(1000)).
/// </summary>
public class DerivRedemptionCondition
{
    [Key]
    public int ID { get; private set; }

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

    /// <summary>상환조건구분코드 (RED_CONDI_TPCD) — 1중간평가 2만기상환</summary>
    public string RedCondiTpcd { get; private set; } = default!;

    /// <summary>평가횟수일련번호 (VALAT_NTIMES_SEQ)</summary>
    public int ValatNtimesSeq { get; private set; }

    /// <summary>중간평가지급일자 (MID_VALAT_PAY_DT)</summary>
    public DateOnly? MidValatPayDt { get; private set; }

    /// <summary>중간평가시작일자 (MID_VALAT_BEGIN_DT)</summary>
    public DateOnly? MidValatBeginDt { get; private set; }

    /// <summary>중간평가종료일자 (MID_VALAT_EXPRY_DT)</summary>
    public DateOnly? MidValatExpryDt { get; private set; }

    /// <summary>상환조건내용 (RED_CONDI_CONTENT) — 최대 1000자</summary>
    public string? RedCondiContent { get; private set; }

    /// <summary>상환계산식내용 (RED_FORMULA_CONTENT) — 최대 1000자</summary>
    public string? RedFormulaContent { get; private set; }

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

    private DerivRedemptionCondition() { }

    public static DerivRedemptionCondition Create(
        string isin,
        string redCondiTpcd,
        int valatNtimesSeq,
        DateOnly? midValatPayDt,
        DateOnly? midValatBeginDt,
        DateOnly? midValatExpryDt,
        string? redCondiContent,
        string? redFormulaContent)
    {
        if (string.IsNullOrWhiteSpace(isin))
        {
            throw new ArgumentException("isin required", nameof(isin));
        }

        return new DerivRedemptionCondition
        {
            Isin = isin.Trim(),
            RedCondiTpcd = redCondiTpcd.Trim(),
            ValatNtimesSeq = valatNtimesSeq,
            MidValatPayDt = midValatPayDt,
            MidValatBeginDt = midValatBeginDt,
            MidValatExpryDt = midValatExpryDt,
            RedCondiContent = Trimmed(redCondiContent),
            RedFormulaContent = Trimmed(redFormulaContent)
        };
    }

    /// <summary>재수집 반영 — 변경 필드가 있을 때만 UpdatedAt 갱신 (자연키 Isin/RedCondiTpcd/ValatNtimesSeq 은 불변)</summary>
    public void Update(
        DateOnly? midValatPayDt,
        DateOnly? midValatBeginDt,
        DateOnly? midValatExpryDt,
        string? redCondiContent,
        string? redFormulaContent)
    {
        var changed = false;

        changed |= Set(midValatPayDt, MidValatPayDt, v => MidValatPayDt = v);
        changed |= Set(midValatBeginDt, MidValatBeginDt, v => MidValatBeginDt = v);
        changed |= Set(midValatExpryDt, MidValatExpryDt, v => MidValatExpryDt = v);
        changed |= Set(Trimmed(redCondiContent), RedCondiContent, v => RedCondiContent = v);
        changed |= Set(Trimmed(redFormulaContent), RedFormulaContent, v => RedFormulaContent = 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;
    }
}