using System.ComponentModel.DataAnnotations;
using Domain.Entities.Stocks.ValueObject;

namespace Domain.Entities.Stocks;

/// <summary>
/// 종목 마스터 (KRX 상장종목) — D1 유일 원천.
/// 타 도메인(D2/D4)은 char(6) Code 를 FK 없이 denorm 보관하고 쓰기 시 AnyAsync 사전 검증한다 (d0 §2.1).
/// LastTradingDate~MarketCap 은 목록/quotes 조인 회피용 denorm — 일별 시세 배치가 갱신.
/// </summary>
public class Stock
{
    [Key]
    public int ID { get; private set; }

    /// <summary>단축코드 (char 6, 예: "005930") — UNIQUE</summary>
    public string Code { get; private set; } = default!;

    /// <summary>표준코드 ISIN (char 12) — 미제공 시 null</summary>
    public string? ISIN { get; private set; }

    /// <summary>종목명 (예: "삼성전자")</summary>
    public string Name { get; private set; } = default!;

    /// <summary>영문 종목명 (선택)</summary>
    public string? EnglishName { get; private set; }

    /// <summary>시장 구분 (1=KOSPI, 2=KOSDAQ, 3=KONEX)</summary>
    public StockMarket Market { get; private set; }

    /// <summary>거래 상태 (0=정상, 1=거래정지, 2=관리종목)</summary>
    public TradingStatus TradingStatus { get; private set; }

    /// <summary>DART 고유번호 (char 8) — corpCode 매핑, 미매핑 null (매핑 배치는 M2)</summary>
    public string? CorpCode { get; private set; }

    /// <summary>KRX 업종명 (선택)</summary>
    public string? SectorName { get; private set; }

    /// <summary>상장 여부 — 상폐 시 soft-off</summary>
    public bool IsActive { get; private set; } = true;

    /// <summary>상장일 — 원천 API 미제공으로 최초 수집 기준일(basDt) 근사값</summary>
    public DateOnly ListedDate { get; private set; }

    /// <summary>상장폐지일 (상폐 시)</summary>
    public DateOnly? DelistedDate { get; private set; }

    /// <summary>최근 거래일 (denorm)</summary>
    public DateOnly? LastTradingDate { get; private set; }

    /// <summary>최근 종가 (denorm)</summary>
    public int? LastClosePrice { get; private set; }

    /// <summary>최근 등락률 % (denorm)</summary>
    public decimal? LastChangeRate { get; private set; }

    /// <summary>시가총액 (denorm)</summary>
    public long? MarketCap { get; private set; }

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

    public DateTime? UpdatedAt { get; private set; }

    private Stock() { }

    public static Stock Create(string code, string name, StockMarket market, DateOnly listedDate, string? isin = null, string? corpCode = null, string? englishName = null, string? sectorName = null)
    {
        if (code is not { Length: 6 } || code.Any(c => !char.IsAsciiDigit(c)))
        {
            throw new ArgumentException("code must be 6 digits", nameof(code));
        }

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

        if (!Enum.IsDefined(market))
        {
            throw new ArgumentOutOfRangeException(nameof(market));
        }

        return new Stock
        {
            Code = code,
            Name = name.Trim(),
            Market = market,
            TradingStatus = TradingStatus.Normal,
            ListedDate = listedDate,
            ISIN = string.IsNullOrWhiteSpace(isin) ? null : isin.Trim(),
            CorpCode = string.IsNullOrWhiteSpace(corpCode) ? null : corpCode.Trim(),
            EnglishName = string.IsNullOrWhiteSpace(englishName) ? null : englishName.Trim(),
            SectorName = string.IsNullOrWhiteSpace(sectorName) ? null : sectorName.Trim()
        };
    }

    /// <summary>마스터 동기화 — 이름/시장/ISIN(+영문명/업종) 반영. 상폐 상태였다면 재상장으로 복구. englishName/sectorName 은 null 전달 시 미변경.</summary>
    public void UpdateMaster(string name, StockMarket market, string? isin, string? englishName = null, string? sectorName = null)
    {
        var changed = false;

        if (!string.IsNullOrWhiteSpace(name) && Name != name.Trim())
        {
            Name = name.Trim();
            changed = true;
        }

        if (Enum.IsDefined(market) && Market != market)
        {
            Market = market;
            changed = true;
        }

        var normalizedIsin = string.IsNullOrWhiteSpace(isin) ? null : isin.Trim();
        if (normalizedIsin is not null && ISIN != normalizedIsin)
        {
            ISIN = normalizedIsin;
            changed = true;
        }

        var normalizedEnglishName = string.IsNullOrWhiteSpace(englishName) ? null : englishName.Trim();
        if (normalizedEnglishName is not null && EnglishName != normalizedEnglishName)
        {
            EnglishName = normalizedEnglishName;
            changed = true;
        }

        var normalizedSectorName = string.IsNullOrWhiteSpace(sectorName) ? null : sectorName.Trim();
        if (normalizedSectorName is not null && SectorName != normalizedSectorName)
        {
            SectorName = normalizedSectorName;
            changed = true;
        }

        if (!IsActive)
        {
            IsActive = true;
            DelistedDate = null;
            changed = true;
        }

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

    /// <summary>상장폐지 — soft-off (row 는 보존, 과거 시세/참조 유지)</summary>
    public void MarkDelisted(DateOnly date)
    {
        if (!IsActive)
        {
            return;
        }

        IsActive = false;
        DelistedDate = date;
        UpdatedAt = DateTime.UtcNow;
    }

    public void SetTradingStatus(TradingStatus status)
    {
        if (!Enum.IsDefined(status) || TradingStatus == status)
        {
            return;
        }

        TradingStatus = status;
        UpdatedAt = DateTime.UtcNow;
    }

    public void SetCorpCode(string? corpCode)
    {
        var normalized = string.IsNullOrWhiteSpace(corpCode) ? null : corpCode.Trim();
        if (CorpCode == normalized)
        {
            return;
        }

        CorpCode = normalized;
        UpdatedAt = DateTime.UtcNow;
    }

    /// <summary>일별 시세 배치가 최근 시세 denorm 을 갱신. 과거 일자 재수집은 무시.</summary>
    public void UpdateLastPrice(DateOnly tradingDate, int closePrice, decimal changeRate, long? marketCap)
    {
        if (LastTradingDate.HasValue && tradingDate < LastTradingDate.Value)
        {
            return;
        }

        LastTradingDate = tradingDate;
        LastClosePrice = closePrice;
        LastChangeRate = changeRate;
        MarketCap = marketCap;
        UpdatedAt = DateTime.UtcNow;
    }
}