using System.Collections.Generic;
using ChunkyImageLib;
using ChunkyImageLib.Operations;
using Drawie.Numerics;
using Xunit;

namespace ChunkyImageLibTest;

public class ClearRegionOperationTests
{
    const int chunkSize = ChunkPool.FullChunkSize;
    [Fact]
    public void FindAffectedChunks_SingleChunk_ReturnsSingleChunk()
    {
        ClearRegionOperation operation = new(new(new(chunkSize, chunkSize), new(chunkSize, chunkSize)));
        var expected = new HashSet<VecI>() { new(1, 1) };
        var actual = operation.FindAffectedArea(new(chunkSize)).Chunks;
        Assert.Equal(expected, actual);
    }

// to keep expected aligned
#pragma warning disable format
    [Fact]
    public void FindAffectedChunks_BigArea_ReturnsCorrectChunks()
    {
        int from = -chunkSize - chunkSize / 2;
        int to = chunkSize + chunkSize / 2;
        ClearRegionOperation operation = new(new(new(from, from), new(to - from, to - from)));
        var expected = new HashSet<VecI>() 
        { 
            new(-2, -2), new(-1, -2), new(0, -2), new(1, -2),
            new(-2, -1), new(-1, -1), new(0, -1), new(1, -1),
            new(-2, -0), new(-1, -0), new(0, -0), new(1, -0),
            new(-2,  1), new(-1,  1), new(0,  1), new(1,  1),
        };
        var actual = operation.FindAffectedArea(new(chunkSize)).Chunks;
        Assert.Equal(expected, actual);
    }
#pragma warning restore format
}