namespace DotTiled.Tests;

public static partial class DotTiledAssert
{
  internal static void AssertTileset(Tileset expected, Tileset actual)
  {
    // Attributes
    Assert.Equal(expected.Version, actual.Version);
    Assert.Equal(expected.TiledVersion, actual.TiledVersion);
    Assert.Equal(expected.FirstGID, actual.FirstGID);
    Assert.Equal(expected.Source, actual.Source);
    Assert.Equal(expected.Name, actual.Name);
    Assert.Equal(expected.Class, actual.Class);
    Assert.Equal(expected.TileWidth, actual.TileWidth);
    Assert.Equal(expected.TileHeight, actual.TileHeight);
    Assert.Equal(expected.Spacing, actual.Spacing);
    Assert.Equal(expected.Margin, actual.Margin);
    Assert.Equal(expected.TileCount, actual.TileCount);
    Assert.Equal(expected.Columns, actual.Columns);
    Assert.Equal(expected.ObjectAlignment, actual.ObjectAlignment);
    Assert.Equal(expected.RenderSize, actual.RenderSize);
    Assert.Equal(expected.FillMode, actual.FillMode);

    // At most one of
    AssertImage(expected.Image, actual.Image);
    AssertTileOffset(expected.TileOffset, actual.TileOffset);
    AssertGrid(expected.Grid, actual.Grid);
    AssertProperties(expected.Properties, actual.Properties);
    // TODO: AssertTerrainTypes(actual.TerrainTypes, expected.TerrainTypes);
    if (expected.Wangsets is not null)
    {
      Assert.NotNull(actual.Wangsets);
      Assert.Equal(expected.Wangsets.Count, actual.Wangsets.Count);
      for (var i = 0; i < expected.Wangsets.Count; i++)
        AssertWangset(expected.Wangsets[i], actual.Wangsets[i]);
    }
    AssertTransformations(expected.Transformations, actual.Transformations);

    // Any number of
    Assert.NotNull(actual.Tiles);
    Assert.Equal(expected.Tiles.Count, actual.Tiles.Count);
    for (var i = 0; i < expected.Tiles.Count; i++)
      AssertTile(expected.Tiles[i], actual.Tiles[i]);
  }

  private static void AssertTileOffset(TileOffset? expected, TileOffset? actual)
  {
    if (expected is null)
    {
      Assert.Null(actual);
      return;
    }

    // Attributes
    Assert.NotNull(actual);
    Assert.Equal(expected.X, actual.X);
    Assert.Equal(expected.Y, actual.Y);
  }

  private static void AssertGrid(Grid? expected, Grid? actual)
  {
    if (expected is null)
    {
      Assert.Null(actual);
      return;
    }

    // Attributes
    Assert.NotNull(actual);
    Assert.Equal(expected.Orientation, actual.Orientation);
    Assert.Equal(expected.Width, actual.Width);
    Assert.Equal(expected.Height, actual.Height);
  }

  private static void AssertWangset(Wangset expected, Wangset actual)
  {
    // Attributes
    Assert.Equal(expected.Name, actual.Name);
    Assert.Equal(expected.Class, actual.Class);
    Assert.Equal(expected.Tile, actual.Tile);

    // At most one of
    AssertProperties(expected.Properties, actual.Properties);
    if (expected.WangColors is not null)
    {
      Assert.NotNull(actual.WangColors);
      Assert.Equal(expected.WangColors.Count, actual.WangColors.Count);
      for (var i = 0; i < expected.WangColors.Count; i++)
        AssertWangColor(expected.WangColors[i], actual.WangColors[i]);
    }
    for (var i = 0; i < expected.WangTiles.Count; i++)
      AssertWangTile(expected.WangTiles[i], actual.WangTiles[i]);
  }

  private static void AssertWangColor(WangColor expected, WangColor actual)
  {
    // Attributes
    Assert.Equal(expected.Name, actual.Name);
    Assert.Equal(expected.Class, actual.Class);
    Assert.Equal(expected.Color, actual.Color);
    Assert.Equal(expected.Tile, actual.Tile);
    Assert.Equal(expected.Probability, actual.Probability);

    AssertProperties(expected.Properties, actual.Properties);
  }

  private static void AssertWangTile(WangTile expected, WangTile actual)
  {
    // Attributes
    Assert.Equal(expected.TileID, actual.TileID);
    Assert.Equal(expected.WangID, actual.WangID);
  }

  private static void AssertTransformations(Transformations? expected, Transformations? actual)
  {
    if (expected is null)
    {
      Assert.Null(actual);
      return;
    }

    // Attributes
    Assert.NotNull(actual);
    Assert.Equal(expected.HFlip, actual.HFlip);
    Assert.Equal(expected.VFlip, actual.VFlip);
    Assert.Equal(expected.Rotate, actual.Rotate);
    Assert.Equal(expected.PreferUntransformed, actual.PreferUntransformed);
  }

  private static void AssertTile(Tile expected, Tile actual)
  {
    // Attributes
    Assert.Equal(expected.ID, actual.ID);
    Assert.Equal(expected.Type, actual.Type);
    Assert.Equal(expected.Probability, actual.Probability);
    Assert.Equal(expected.X, actual.X);
    Assert.Equal(expected.Y, actual.Y);
    Assert.Equal(expected.Width, actual.Width);
    Assert.Equal(expected.Height, actual.Height);

    // Elements
    AssertProperties(actual.Properties, expected.Properties);
    AssertImage(actual.Image, expected.Image);
    AssertLayer((BaseLayer?)actual.ObjectLayer, (BaseLayer?)expected.ObjectLayer);
    if (expected.Animation is not null)
    {
      Assert.NotNull(actual.Animation);
      Assert.Equal(expected.Animation.Count, actual.Animation.Count);
      for (var i = 0; i < expected.Animation.Count; i++)
        AssertFrame(expected.Animation[i], actual.Animation[i]);
    }
  }

  private static void AssertFrame(Frame expected, Frame actual)
  {
    // Attributes
    Assert.Equal(expected.TileID, actual.TileID);
    Assert.Equal(expected.Duration, actual.Duration);
  }
}