using Infrastructure.StockData;

namespace Application.Tests;

[TestClass]
public sealed class WorldIndexParserTests
{
    [TestMethod]
    public void Parse_MapsFields_LowercasesSymbol()
    {
        // Stooq 라이트 배치(/q/l/?f=sd2t2ohlc&h&e=csv) 표준 응답 — 헤더 + 2행
        const string csv = """
        Symbol,Date,Time,Open,High,Low,Close
        ^SPX,2026-07-07,22:15:00,5100.50,5130.00,5090.10,5125.30
        ^NKX,2026-07-07,06:00:00,39000,39250,38900,39180.5
        """;

        var rows = WorldIndexCsvParser.Parse(csv);

        Assert.AreEqual(2, rows.Count);

        var spx = rows[0];
        Assert.AreEqual("^spx", spx.Symbol, "심볼은 소문자 정규화");
        Assert.AreEqual(new DateOnly(2026, 7, 7), spx.TradeDate);
        Assert.AreEqual(5100.50m, spx.Open);
        Assert.AreEqual(5130.00m, spx.High);
        Assert.AreEqual(5090.10m, spx.Low);
        Assert.AreEqual(5125.30m, spx.Close);

        var nkx = rows[1];
        Assert.AreEqual("^nkx", nkx.Symbol);
        Assert.AreEqual(39180.5m, nkx.Close);
    }

    [TestMethod]
    public void Parse_MissingClose_SkipsRow_MissingOhlc_FallsBackToClose()
    {
        // 첫 행: Close 가 N/D → 버림. 둘째 행: OHLC 가 N/D 지만 Close 유효 → OHLC 는 Close 로 보정.
        const string csv = """
        Symbol,Date,Time,Open,High,Low,Close
        ^BAD,N/D,N/D,N/D,N/D,N/D,N/D
        ^HSI,2026-07-07,10:00:00,N/D,N/D,N/D,24500.75
        """;

        var rows = WorldIndexCsvParser.Parse(csv);

        Assert.AreEqual(1, rows.Count, "Close 결측(N/D) 행은 제외");
        var hsi = rows[0];
        Assert.AreEqual("^hsi", hsi.Symbol);
        Assert.AreEqual(24500.75m, hsi.Close);
        Assert.AreEqual(24500.75m, hsi.Open, "OHLC 결측은 Close 로 보정");
        Assert.AreEqual(24500.75m, hsi.High);
        Assert.AreEqual(24500.75m, hsi.Low);
    }

    [TestMethod]
    public void Parse_EmptyOrHeaderOnly_ReturnsEmpty()
    {
        Assert.AreEqual(0, WorldIndexCsvParser.Parse("").Count);
        Assert.AreEqual(0, WorldIndexCsvParser.Parse("   ").Count);
        Assert.AreEqual(0, WorldIndexCsvParser.Parse("Symbol,Date,Time,Open,High,Low,Close").Count, "헤더만 있으면 0건");
    }
}