using VoxelEngine.Core;
using Xunit;

namespace VoxelEngine.Tests;

public class ConfigurationTests
{
    [Fact]
    public void Defaults_AreSane()
    {
        var c = new Configuration();
        Assert.True(c.RenderDistanceHorizontal >= 1);
        Assert.True(c.RenderDistanceVertical >= 1);
        Assert.True(c.SpawnReadyRadiusHorizontal >= 0);
        Assert.True(c.MaxGenerateJobsInFlight >= 1);
        Assert.True(c.MaxMeshUploadsPerFrame >= 1);
        Assert.True(c.WorkerThreadCount >= 1);
        Assert.True(c.MoveSpeed > 0f);
        Assert.True(c.MouseSensitivity > 0f);
        Assert.InRange(c.Fov, 1f, 179f);
        Assert.True(c.WindowWidth > 0);
        Assert.True(c.WindowHeight > 0);
        Assert.Null(c.Seed);
    }

    [Fact]
    public void Properties_AreMutable()
    {
        var c = new Configuration { RenderDistanceHorizontal = 4, Seed = 1337 };
        Assert.Equal(4, c.RenderDistanceHorizontal);
        Assert.Equal(1337, c.Seed);

        var c2 = new Configuration
        {
            RenderDistanceVertical     = 2,
            SpawnReadyRadiusHorizontal = 0,
            MaxGenerateJobsInFlight    = 2,
            MaxMeshUploadsPerFrame     = 1,
            WorkerThreadCount          = 2,
            MoveSpeed                  = 4f,
            MouseSensitivity           = 0.5f,
            Fov                        = 90f,
            WindowWidth                = 800,
            WindowHeight               = 600,
        };
        Assert.Equal(2,    c2.RenderDistanceVertical);
        Assert.Equal(0,    c2.SpawnReadyRadiusHorizontal);
        Assert.Equal(2,    c2.MaxGenerateJobsInFlight);
        Assert.Equal(1,    c2.MaxMeshUploadsPerFrame);
        Assert.Equal(2,    c2.WorkerThreadCount);
        Assert.Equal(4f,   c2.MoveSpeed);
        Assert.Equal(0.5f, c2.MouseSensitivity);
        Assert.Equal(90f,  c2.Fov);
        Assert.Equal(800,  c2.WindowWidth);
        Assert.Equal(600,  c2.WindowHeight);
    }

    [Fact]
    public void Defaults_HaveCaveTuningConstants()
    {
        var c = new Configuration();

        // Algorithm
        Assert.Equal(0.03f, c.CaveNoiseFrequency);
        Assert.Equal(-0.3f, c.CaveNoiseThreshold);
        Assert.Equal(64,    c.WormCellSize);
        Assert.Equal(300,   c.WormSpawnProbabilityPermille);
        Assert.Equal(80,    c.WormMaxLength);
        Assert.Equal(1.5f,  c.WormMinRadius);
        Assert.Equal(3.5f,  c.WormMaxRadius);

        // Lighting (fog)
        Assert.Equal(72f,   c.CaveDarkStartY);    // SeaLevel (64) + 8
        Assert.Equal(32f,   c.CaveDarkEndY);      // SeaLevel (64) - 32
        Assert.Equal(0.15f, c.CaveMinBrightness);
    }

    [Fact]
    public void Defaults_HaveVisibilityAndCaveCeilingConstants()
    {
        var c = new Configuration();

        Assert.Equal(1, c.SurfaceShellSkirtBelow);
        Assert.Equal(0.7f, c.FogStartFraction);
        Assert.Equal(new OpenTK.Mathematics.Vector3(0.45f, 0.65f, 0.95f), c.SkyColor);
        Assert.Equal(127, c.MinCaveY);
    }
}