using System.ComponentModel.DataAnnotations;

namespace Domain.Entities.Stocks;

/// <summary>
/// SEIBro 채권 이자지급 정보 (getIntPayInfo) — 이자지급 주기·방식·직전/차기 이표일 (Wave 4). PK Isin (스냅샷 갱신).
/// ⚠️ 실샘플 fixture 가 result="0"(빈) 이라 필드 매핑은 채권.md 스펙 기준 — 운영 첫 수집 시 로그로 확인.
/// 응답에 ISIN 필드가 없을 수 있어(getIntPayInfo 는 ISIN 을 요청 파라미터로만 받음) 배치가 요청 ISIN 을 스탬핑한다.
/// </summary>
public class BondInterestPayment
{
    /// <summary>종목코드 (ISIN, 요청값 스탬핑) — PK</summary>
    [Key]
    [MaxLength(12)]
    public string Isin { get; private set; } = default!;

    /// <summary>표면이자율 (COUPON_RATE)</summary>
    public decimal? CouponRate { get; private set; }

    /// <summary>이자지급방법구분코드 (INT_PAY_WAY_TPCD) — 1이표 2할인 3복리 4단리</summary>
    public string? IntPayWayTpcd { get; private set; }

    /// <summary>이자지급주기기간수 (INT_PAY_CYCLE_TERMS)</summary>
    public int? IntPayCycleTerms { get; private set; }

    /// <summary>이자지급주기구분코드 (INT_PAY_CYCLE_TPCD) — 23개월 24분기 25반기 26년 99기타</summary>
    public string? IntPayCycleTpcd { get; private set; }

    /// <summary>절상절사구분코드 (RVLT_SEVER_TPCD) — 1올림 2버림 3반올림 9해당없음</summary>
    public string? RvltSeverTpcd { get; private set; }

    /// <summary>경과이자지급여부 (ACRINT_PAY_YN, Y/N)</summary>
    public bool? AcrintPayYn { get; private set; }

    /// <summary>은행휴무일이자지급일구분코드 (BANK_HOLIDAY_INT_PAYDD_TPCD) — 1직전영업일 2직후영업일 3해당일</summary>
    public string? BankHolidayIntPaydayTpcd { get; private set; }

    /// <summary>이자지급시기구분코드 (INT_PAY_TIMS_TPCD) — 01후급 02선급 03상환시 04발행시</summary>
    public string? IntPayTimsTpcd { get; private set; }

    /// <summary>직전이표일 (BEFORE_DATE)</summary>
    public DateOnly? BeforeDate { get; private set; }

    /// <summary>차기이표일 (AFTER_DATE)</summary>
    public DateOnly? AfterDate { get; private set; }

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

    private BondInterestPayment() { }

    public static BondInterestPayment Create(
        string isin,
        decimal? couponRate,
        string? intPayWayTpcd,
        int? intPayCycleTerms,
        string? intPayCycleTpcd,
        string? rvltSeverTpcd,
        bool? acrintPayYn,
        string? bankHolidayIntPaydayTpcd,
        string? intPayTimsTpcd,
        DateOnly? beforeDate,
        DateOnly? afterDate)
    {
        if (string.IsNullOrWhiteSpace(isin))
        {
            throw new ArgumentException("isin required", nameof(isin));
        }

        return new BondInterestPayment
        {
            Isin = isin.Trim(),
            CouponRate = couponRate,
            IntPayWayTpcd = Trimmed(intPayWayTpcd),
            IntPayCycleTerms = intPayCycleTerms,
            IntPayCycleTpcd = Trimmed(intPayCycleTpcd),
            RvltSeverTpcd = Trimmed(rvltSeverTpcd),
            AcrintPayYn = acrintPayYn,
            BankHolidayIntPaydayTpcd = Trimmed(bankHolidayIntPaydayTpcd),
            IntPayTimsTpcd = Trimmed(intPayTimsTpcd),
            BeforeDate = beforeDate,
            AfterDate = afterDate
        };
    }

    /// <summary>재수집 반영 (PK Isin 은 불변) — 스냅샷 갱신, 변경 시에만 UpdatedAt</summary>
    public void Update(
        decimal? couponRate,
        string? intPayWayTpcd,
        int? intPayCycleTerms,
        string? intPayCycleTpcd,
        string? rvltSeverTpcd,
        bool? acrintPayYn,
        string? bankHolidayIntPaydayTpcd,
        string? intPayTimsTpcd,
        DateOnly? beforeDate,
        DateOnly? afterDate)
    {
        var changed = false;

        changed |= Set(couponRate, CouponRate, v => CouponRate = v);
        changed |= Set(Trimmed(intPayWayTpcd), IntPayWayTpcd, v => IntPayWayTpcd = v);
        changed |= Set(intPayCycleTerms, IntPayCycleTerms, v => IntPayCycleTerms = v);
        changed |= Set(Trimmed(intPayCycleTpcd), IntPayCycleTpcd, v => IntPayCycleTpcd = v);
        changed |= Set(Trimmed(rvltSeverTpcd), RvltSeverTpcd, v => RvltSeverTpcd = v);
        changed |= Set(acrintPayYn, AcrintPayYn, v => AcrintPayYn = v);
        changed |= Set(Trimmed(bankHolidayIntPaydayTpcd), BankHolidayIntPaydayTpcd, v => BankHolidayIntPaydayTpcd = v);
        changed |= Set(Trimmed(intPayTimsTpcd), IntPayTimsTpcd, v => IntPayTimsTpcd = v);
        changed |= Set(beforeDate, BeforeDate, v => BeforeDate = v);
        changed |= Set(afterDate, AfterDate, v => AfterDate = 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;
    }
}