using System;
using System.IO;
using System.Text;
using System.Text.Json;
using Xunit;

namespace QuantEngine.Core.Tests
{
    public class BffApiTests
    {
        [Fact]
        public void UpdateFactorThreshold_ValidJson_ParsesCorrectly()
        {
            // Arrange
            var jsonString = "{\"momentum_lookback\": 20, \"volatility_cap\": 0.05}";

            // Act
            using var doc = JsonDocument.Parse(jsonString);
            var root = doc.RootElement;
            var lookback = root.GetProperty("momentum_lookback").GetInt32();
            var cap = root.GetProperty("volatility_cap").GetDouble();

            // Assert
            Assert.Equal(20, lookback);
            Assert.Equal(0.05, cap);
        }

        [Fact]
        public void ExportStreamingFactorOlap_WriteCsvRow_MatchesExpectedFormat()
        {
            // Arrange
            var sb = new StringBuilder();
            var headers = new[] { "ticker", "as_of_date", "close_price", "nav_price" };
            sb.AppendLine(string.Join(",", headers));

            var row = new object[] { "123456", "2026-07-25", 50000, 49800 };
            sb.AppendLine(string.Join(",", row));

            // Act
            var output = sb.ToString();

            // Assert
            Assert.Contains("ticker,as_of_date,close_price,nav_price", output);
            Assert.Contains("123456,2026-07-25,50000,49800", output);
        }

        [Fact]
        public void BulkInsertMarketExcel_EmptyCellValidation_DetectsNull()
        {
            // Arrange
            string? ticker = null;
            double? price = null;


            // Act
            bool isInvalid = string.IsNullOrEmpty(ticker) || !price.HasValue;

            // Assert
            Assert.True(isInvalid);
        }
    }
}