using LibHac.Common;
using LibHac.Fs;
using LibHac.Fs.Fsa;
using Xunit;

namespace LibHac.Tests.Fs.IFileSystemTestBase;

public abstract partial class IFileSystemTests
{
    [Fact]
    public void RenameFile_SameParentDirectory_EntryIsRenamed()
    {
        IFileSystem fs = CreateFileSystem();

        fs.CreateFile("/file1", 0, CreateFileOptions.None);

        Assert.Success(fs.RenameFile("/file1", "/file2"));

        Assert.Success(fs.GetEntryType(out DirectoryEntryType type, "/file2"));
        Result rc = fs.GetEntryType(out _, "/file1");

        Assert.Equal(DirectoryEntryType.File, type);
        Assert.Result(ResultFs.PathNotFound, rc);
    }
    [Fact]
    public void RenameFile_DifferentParentDirectory_EntryIsRenamed()
    {
        IFileSystem fs = CreateFileSystem();

        fs.CreateFile("/file1", 0, CreateFileOptions.None);
        fs.CreateDirectory("/dir");

        Assert.Success(fs.RenameFile("/file1", "/dir/file2"));

        Assert.Success(fs.GetEntryType(out DirectoryEntryType type, "/dir/file2"));
        Result rc = fs.GetEntryType(out _, "/file1");

        Assert.Equal(DirectoryEntryType.File, type);
        Assert.Result(ResultFs.PathNotFound, rc);
    }

    [Fact]
    public void RenameFile_DestExistsAsFile_ReturnsPathAlreadyExists()
    {
        IFileSystem fs = CreateFileSystem();

        fs.CreateFile("/file1", 0, CreateFileOptions.None);
        fs.CreateFile("/file2", 0, CreateFileOptions.None);

        Result rc = fs.RenameFile("/file1", "/file2");

        Assert.Result(ResultFs.PathAlreadyExists, rc);
    }

    [Fact]
    public void RenameFile_DestExistsAsDirectory_ReturnsPathAlreadyExists()
    {
        IFileSystem fs = CreateFileSystem();

        fs.CreateFile("/file", 0, CreateFileOptions.None);
        fs.CreateDirectory("/dir");

        Result rc = fs.RenameFile("/file", "/dir");

        Assert.Result(ResultFs.PathAlreadyExists, rc);
    }

    [Fact]
    public void RenameFile_DestExistsAsFile_FileSizesDoNotChange()
    {
        IFileSystem fs = CreateFileSystem();

        fs.CreateFile("/file1", 54321, CreateFileOptions.None);
        fs.CreateFile("/file2", 12345, CreateFileOptions.None);

        fs.RenameFile("/file1", "/file2");

        using var file1 = new UniqueRef<IFile>();
        using var file2 = new UniqueRef<IFile>();

        Assert.Success(fs.OpenFile(ref file1.Ref(), "/file1", OpenMode.Read));
        Assert.Success(fs.OpenFile(ref file2.Ref(), "/file2", OpenMode.Read));

        Assert.Success(file1.Get.GetSize(out long file1Size));
        Assert.Success(file2.Get.GetSize(out long file2Size));

        Assert.Equal(54321, file1Size);
        Assert.Equal(12345, file2Size);
    }

    [Fact]
    public void RenameFile_DataIsUnmodified()
    {
        byte[] data = { 7, 4, 1, 0, 8, 5, 2, 9, 6, 3 };

        IFileSystem fs = CreateFileSystem();

        fs.CreateFile("/file", data.Length, CreateFileOptions.None);

        using var file = new UniqueRef<IFile>();
        fs.OpenFile(ref file.Ref(), "/file", OpenMode.Write);
        file.Get.Write(0, data, WriteOption.None);
        file.Reset();

        fs.RenameFile("/file", "/renamed");

        byte[] readData = new byte[data.Length];

        fs.OpenFile(ref file.Ref(), "/renamed", OpenMode.Read);
        Result rc = file.Get.Read(out long bytesRead, 0, readData, ReadOption.None);

        Assert.Success(rc);
        Assert.Equal(data.Length, bytesRead);
        Assert.Equal(data, readData);
    }
}
