using Recordingtest.Bridge;
using Recordingtest.EgPlugin;
using Xunit;

namespace Recordingtest.EgPlugin.Tests;

public class ChainedEngineStateProviderTests
{
    private sealed class ScriptedProvider : IEngineStateProvider
    {
        public IReadOnlyList<string> SelectedIds = Array.Empty<string>();
        public CameraSnapshot Camera = new(
            new double[] { 0, 0, 0 },
            new double[] { 0, 0, 0 },
            new double[] { 0, 0, 1 },
            45.0);
        public SceneSnapshot Scene = new(0, null);
        public bool Render = true;

        public IReadOnlyList<string> GetSelectedIds() => SelectedIds;
        public CameraSnapshot GetCamera() => Camera;
        public SceneSnapshot GetScene() => Scene;
        public bool GetRenderComplete() => Render;
    }

    [Fact]
    public void Selection_Primary_NonEmpty_Wins()
    {
        var p = new ScriptedProvider { SelectedIds = new[] { "a" } };
        var f = new ScriptedProvider { SelectedIds = new[] { "fallback" } };
        var c = new ChainedEngineStateProvider(p, f);
        Assert.Equal(new[] { "a" }, c.GetSelectedIds());
    }

    [Fact]
    public void Selection_Primary_Empty_Falls_Through()
    {
        var p = new ScriptedProvider();
        var f = new ScriptedProvider { SelectedIds = new[] { "fallback" } };
        var c = new ChainedEngineStateProvider(p, f);
        Assert.Equal(new[] { "fallback" }, c.GetSelectedIds());
    }

    [Fact]
    public void Camera_Primary_Default_Falls_Through()
    {
        var p = new ScriptedProvider();
        var fc = new CameraSnapshot(new double[] { 1, 2, 3 }, new double[] { 4, 5, 6 }, new double[] { 0, 0, 1 }, 60);
        var f = new ScriptedProvider { Camera = fc };
        var c = new ChainedEngineStateProvider(p, f);
        Assert.Equal(60.0, c.GetCamera().Fov);
    }

    [Fact]
    public void Camera_Primary_NonDefault_Wins()
    {
        var pc = new CameraSnapshot(new double[] { 1, 0, 0 }, new double[] { 0, 0, 0 }, new double[] { 0, 0, 1 }, 30);
        var p = new ScriptedProvider { Camera = pc };
        var f = new ScriptedProvider();
        var c = new ChainedEngineStateProvider(p, f);
        Assert.Equal(30.0, c.GetCamera().Fov);
    }

    [Fact]
    public void Scene_Primary_Empty_Falls_Through()
    {
        var p = new ScriptedProvider();
        var f = new ScriptedProvider { Scene = new(7, "x.hmeg") };
        var c = new ChainedEngineStateProvider(p, f);
        var s = c.GetScene();
        Assert.Equal(7, s.ObjectCount);
        Assert.Equal("x.hmeg", s.DocumentPath);
    }

    [Fact]
    public void Scene_Primary_Has_Path_Wins_Even_With_Zero_Objects()
    {
        var p = new ScriptedProvider { Scene = new(0, "primary.hmeg") };
        var f = new ScriptedProvider { Scene = new(99, "fallback.hmeg") };
        var c = new ChainedEngineStateProvider(p, f);
        var s = c.GetScene();
        Assert.Equal("primary.hmeg", s.DocumentPath);
    }

    [Fact]
    public void Render_Primary_Always_Wins()
    {
        var p = new ScriptedProvider { Render = false };
        var f = new ScriptedProvider { Render = true };
        var c = new ChainedEngineStateProvider(p, f);
        Assert.False(c.GetRenderComplete());
    }
}