using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using Wickra;
using Xunit;

// Cross-language data-layer parity: replay the shared golden tick stream through
// the TickAggregator and check the candles against the Rust reference, with and
// without gap filling.
public class DataLayerTests
{
    private static string GoldenDir([System.Runtime.CompilerServices.CallerFilePath] string file = "") =>
        Path.GetFullPath(Path.Combine(Path.GetDirectoryName(file)!, "..", "..", "..", "testdata", "golden"));

    private static double[][] Read(string name)
    {
        var lines = File.ReadAllLines(Path.Combine(GoldenDir(), name + ".csv"));
        var rows = new List<double[]>();
        for (var i = 1; i < lines.Length; i++)
        {
            if (lines[i].Length == 0)
            {
                continue;
            }
            rows.Add(Array.ConvertAll(lines[i].Split(','), s => double.Parse(s, CultureInfo.InvariantCulture)));
        }
        return rows.ToArray();
    }

    [Theory]
    [InlineData(false, "data_candles")]
    [InlineData(true, "data_candles_gap")]
    public void TickAggregatorMatchesGolden(bool gapFill, string fixture)
    {
        var ticks = Read("data_ticks");
        using var agg = new TickAggregator(1000, gapFill);
        var got = new List<double[]>();
        foreach (var t in ticks)
        {
            foreach (var c in agg.Push(t[0], t[1], (long)t[2]))
            {
                got.Add(new[] { c.Open, c.High, c.Low, c.Close, c.Volume, (double)c.Timestamp });
            }
        }
        var want = Read(fixture);
        Assert.Equal(want.Length, got.Count);
        for (var i = 0; i < got.Count; i++)
        {
            for (var j = 0; j < 6; j++)
            {
                var tol = 1e-9 * Math.Max(1, Math.Abs(want[i][j]));
                Assert.True(
                    Math.Abs(got[i][j] - want[i][j]) <= tol,
                    $"{fixture} row {i} col {j}: {got[i][j]} vs {want[i][j]}");
            }
        }
    }
}