using Microsoft.Extensions.Logging.Abstractions;
using TileServer.Domain.Tiles;
using TileServer.Infrastructure.Tiles;
using TileServer.Infrastructure.Tiles.Mvt;

namespace TileServer.UnitTests;

public sealed class VectorTileOverzoomerTests
{
    [Fact]
    public void Overzoom_MapsParentPointIntoNwChild()
    {
        var parent = EncodePoint(100, 100, "poi");
        var overzoomer = new VectorTileOverzoomer(NullLogger<VectorTileOverzoomer>.Instance);
        var child = overzoomer.Overzoom(parent, new TileCoordinate(0, 0, 0), new TileCoordinate(1, 0, 0));

        var decoded = MvtCodec.Decode(child);
        var layer = Assert.Single(decoded.Layers);
        Assert.Equal("poi", layer.Name);
        var feature = Assert.Single(layer.Features);
        var path = Assert.Single(MvtCodec.DecodeGeometry(feature.Geometry));
        var point = Assert.Single(path);
        Assert.Equal(200, point.X);
        Assert.Equal(200, point.Y);
    }

    [Fact]
    public void Overzoom_DropsPointOutsideChild()
    {
        var parent = EncodePoint(100, 100, "poi");
        var overzoomer = new VectorTileOverzoomer(NullLogger<VectorTileOverzoomer>.Instance);
        var child = overzoomer.Overzoom(parent, new TileCoordinate(0, 0, 0), new TileCoordinate(1, 1, 1));

        var decoded = MvtCodec.Decode(child);
        Assert.Empty(decoded.Layers);
    }

    private static TileData EncodePoint(int x, int y, string layerName)
    {
        var tile = new MvtTile
        {
            Layers =
            [
                new MvtLayer
                {
                    Name = layerName,
                    Extent = 4096,
                    Version = 2,
                    Keys = ["class"],
                    Values = [new MvtValue { StringValue = "test" }],
                    Features =
                    [
                        new MvtFeature
                        {
                            Id = 1,
                            Type = MvtCodec.Point,
                            Tags = [0, 0],
                            Geometry = MvtCodec.EncodeGeometry([[(x, y)]], close: false)
                        }
                    ]
                }
            ]
        };
        return MvtCodec.EncodeGzip(tile);
    }
}