using System.ComponentModel.DataAnnotations;

namespace Domain.Entities.Stocks;

/// <summary>
/// SEIBro 주식증감내역 (getStkIncdecDetails) — 발행횟수별 주식수 변동(액면분할·증자·이익소각 등) (Wave 2 ★P1).
/// rolling per-회사번호(SHOTN_ISIN) 로 수집한다.
/// ⚠️ 자연키: plan 은 (Isin, SecnIssuNtimes) 를 제시하나 실응답(삼성전자 fixture)에서 동일 발행횟수(75)가
/// 서로 다른 발행일·사유(액면분할 20180503 / 이익소각 20181204)로 2행 존재한다 → (Isin, SecnIssuNtimes) 단독은 충돌.
/// 따라서 UNIQUE (Isin, SecnIssuNtimes, IssuDt, SecnIssuRacd) 로 확장해 데이터 손실 없이 upsert 한다.
/// </summary>
public class StockIssuanceChange
{
    [Key]
    public int ID { get; private set; }

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

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

    /// <summary>종목종류코드 (SECN_KACD) — 0101 보통주 0201 우선주…</summary>
    public string? SecnKacd { get; private set; }

    /// <summary>종목발행횟수 (SECN_ISSU_NTIMES)</summary>
    public int SecnIssuNtimes { get; private set; }

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

    /// <summary>발행가 (ISSUPRC, 1주당)</summary>
    public decimal? Issuprc { get; private set; }

    /// <summary>발행수량 (ISSU_QTY) — 감소는 음수</summary>
    public long? IssuQty { get; private set; }

    /// <summary>종목발행사유코드 (SECN_ISSU_RACD)</summary>
    public string SecnIssuRacd { get; private set; } = default!;

    /// <summary>종목발행사유명 (SECN_ISSU_NM) — 예 액면분할</summary>
    public string? SecnIssuNm { get; private set; }

    /// <summary>상장일자 (LIST_DT)</summary>
    public DateOnly? ListDt { get; private set; }

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

    private StockIssuanceChange() { }

    public static StockIssuanceChange Create(
        int? issucoCustno,
        string isin,
        string? secnKacd,
        int secnIssuNtimes,
        DateOnly issuDt,
        decimal? issuprc,
        long? issuQty,
        string secnIssuRacd,
        string? secnIssuNm,
        DateOnly? listDt)
    {
        if (string.IsNullOrWhiteSpace(isin))
        {
            throw new ArgumentException("isin required", nameof(isin));
        }

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

        return new StockIssuanceChange
        {
            IssucoCustno = issucoCustno,
            Isin = isin.Trim(),
            SecnKacd = string.IsNullOrWhiteSpace(secnKacd) ? null : secnKacd.Trim(),
            SecnIssuNtimes = secnIssuNtimes,
            IssuDt = issuDt,
            Issuprc = issuprc,
            IssuQty = issuQty,
            SecnIssuRacd = secnIssuRacd.Trim(),
            SecnIssuNm = string.IsNullOrWhiteSpace(secnIssuNm) ? null : secnIssuNm.Trim(),
            ListDt = listDt
        };
    }

    /// <summary>재수집 반영 — 변경 필드가 있을 때만 UpdatedAt 갱신 (자연키는 불변)</summary>
    public void Update(
        int? issucoCustno,
        string? secnKacd,
        decimal? issuprc,
        long? issuQty,
        string? secnIssuNm,
        DateOnly? listDt)
    {
        var changed = false;

        if (issucoCustno is not null && IssucoCustno != issucoCustno)
        {
            IssucoCustno = issucoCustno;
            changed = true;
        }

        var normalizedSecnKacd = string.IsNullOrWhiteSpace(secnKacd) ? null : secnKacd.Trim();
        if (SecnKacd != normalizedSecnKacd)
        {
            SecnKacd = normalizedSecnKacd;
            changed = true;
        }

        if (Issuprc != issuprc)
        {
            Issuprc = issuprc;
            changed = true;
        }

        if (IssuQty != issuQty)
        {
            IssuQty = issuQty;
            changed = true;
        }

        var normalizedSecnIssuNm = string.IsNullOrWhiteSpace(secnIssuNm) ? null : secnIssuNm.Trim();
        if (SecnIssuNm != normalizedSecnIssuNm)
        {
            SecnIssuNm = normalizedSecnIssuNm;
            changed = true;
        }

        if (ListDt != listDt)
        {
            ListDt = listDt;
            changed = true;
        }

        if (changed)
        {
            UpdatedAt = DateTime.UtcNow;
        }
    }
}