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

namespace Domain.Entities.Stocks;

/// <summary>
/// 일반상품(석유·금·배출권) 일별매매 시세 (KRX OpenAPI gen 엔드포인트) — (CommodityMarket, Code, TradeDate) UNIQUE.
/// 세 시장을 한 테이블에 담고 CommodityMarket 으로 구분한다. 시장별 응답 shape 이 다르다:
///  - 금(Gold)/배출권(Emission): ISU_CD/ISU_NM + 주식형 OHLC(TDD_CLSPRC/OPNPRC/HGPRC/LWPRC) + 전일대비(CMPPREVDD_PRC)·등락률(FLUC_RT).
///  - 석유(Oil): ISU_CD 없음 → OIL_NM(유종구분)을 Code·Name 으로 사용. OHLC 미제공(Open/High/Low=0), 전일대비·등락률 없음 → null.
///    가격은 가중평균가격_경쟁(WT_AVG_PRC)을 Close 로, 가중평균가격_협의(WT_DIS_AVG_PRC)를 WeightedDiscussionPrice(석유 전용 nullable)로 담는다.
/// 공통 필드: Code/Name, TradeDate, Close/Open/High/Low(decimal 18,2), Volume/TradeValue(long). 등락은 금/배출권만, 협의가격은 석유만.
/// </summary>
public class CommodityDailyTrade
{
    [Key]
    public long ID { get; private set; }

    /// <summary>일반상품 시장 구분 (1=석유, 2=금, 3=배출권)</summary>
    public CommodityMarket CommodityMarket { get; private set; }

    /// <summary>단축코드 (ISU_CD) — 금/배출권. 석유는 OIL_NM(유종구분)을 코드로 사용</summary>
    public string Code { get; private set; } = default!;

    /// <summary>종목명 (ISU_NM) — 석유는 OIL_NM(유종구분)</summary>
    public string Name { get; private set; } = default!;

    /// <summary>거래일 (BAS_DD)</summary>
    public DateOnly TradeDate { get; private set; }

    /// <summary>종가 (TDD_CLSPRC) — 석유는 가중평균가격_경쟁 (WT_AVG_PRC)</summary>
    public decimal Close { get; private set; }

    /// <summary>시가 (TDD_OPNPRC) — 석유 미제공 시 0</summary>
    public decimal Open { get; private set; }

    /// <summary>고가 (TDD_HGPRC) — 석유 미제공 시 0</summary>
    public decimal High { get; private set; }

    /// <summary>저가 (TDD_LWPRC) — 석유 미제공 시 0</summary>
    public decimal Low { get; private set; }

    /// <summary>전일 대비 (CMPPREVDD_PRC) — 금/배출권만. 석유는 미제공 → null</summary>
    public decimal? ChangeAmount { get; private set; }

    /// <summary>등락률 % (FLUC_RT) — 금/배출권만. 석유는 미제공 → null</summary>
    public decimal? ChangeRate { get; private set; }

    /// <summary>가중평균가격_협의 (WT_DIS_AVG_PRC) — 석유만. 금/배출권은 null</summary>
    public decimal? WeightedDiscussionPrice { get; private set; }

    /// <summary>거래량 (ACC_TRDVOL)</summary>
    public long Volume { get; private set; }

    /// <summary>거래대금 (ACC_TRDVAL, 원)</summary>
    public long TradeValue { get; private set; }

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

    private CommodityDailyTrade() { }

    public static CommodityDailyTrade Create(
        CommodityMarket commodityMarket,
        string code,
        string name,
        DateOnly tradeDate,
        decimal close,
        decimal open,
        decimal high,
        decimal low,
        decimal? changeAmount,
        decimal? changeRate,
        decimal? weightedDiscussionPrice,
        long volume,
        long tradeValue
    ) {
        if (!Enum.IsDefined(commodityMarket))
        {
            throw new ArgumentOutOfRangeException(nameof(commodityMarket));
        }

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

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

        return new CommodityDailyTrade
        {
            CommodityMarket = commodityMarket,
            Code = code.Trim(),
            Name = name.Trim(),
            TradeDate = tradeDate,
            Close = close,
            Open = open,
            High = high,
            Low = low,
            ChangeAmount = changeAmount,
            ChangeRate = changeRate,
            WeightedDiscussionPrice = weightedDiscussionPrice,
            Volume = volume,
            TradeValue = tradeValue
        };
    }

    /// <summary>동일 (CommodityMarket, Code, TradeDate) 재수집 시 값 갱신 (upsert)</summary>
    public void Update(
        string name,
        decimal close,
        decimal open,
        decimal high,
        decimal low,
        decimal? changeAmount,
        decimal? changeRate,
        decimal? weightedDiscussionPrice,
        long volume,
        long tradeValue
    ) {
        Name = name.Trim();
        Close = close;
        Open = open;
        High = high;
        Low = low;
        ChangeAmount = changeAmount;
        ChangeRate = changeRate;
        WeightedDiscussionPrice = weightedDiscussionPrice;
        Volume = volume;
        TradeValue = tradeValue;
    }
}