using XFESystem.Core;
using Xunit;

namespace XFESystem.Core.Tests;

public class WorkspaceTests
{
    [Theory]
    [InlineData("/etc/passwd")]
    [InlineData("C:\\Windows")]
    [InlineData("X:relative")]
    [InlineData("X:\\Users\\..\\System")]
    [InlineData("X:\\Users\\Bad:File")]
    [InlineData("X:\\Users\\Trailing.")]
    [InlineData("X:\\Users\\Trailing ")]
    [InlineData("X:\\Users\\Control\u001b")]
    public void InvalidNamespaceIsRejected(string path) => Assert.Throws<ArgumentException>(() => SystemPaths.Normalize(path));

    [Fact]
    public void PublicSystemDirectoriesUseWindowsStyleNames()
    {
        var storage = new MemoryWorkspace(false);
        Assert.False(storage.IsPersistent);
        Assert.Equal(new[] { "Programs", "System", "Temporary", "Users" }, storage.List(SystemPaths.Root).Select(e => e.Name));
        Assert.Equal(SystemPaths.Root, SystemPaths.Parent(SystemPaths.System));
        Assert.Equal("X:\\System", SystemPaths.Normalize("x:\\\\System\\"));
    }

    [Fact]
    public void MoveDirectoryPreservesSubtreeAndInvalidMovesAreAtomic()
    {
        var storage = new MemoryWorkspace(false);
        storage.CreateDirectory("X:\\Users\\Default\\Documents\\Folder\\Subfolder");
        storage.WriteText("X:\\Users\\Default\\Documents\\Folder\\Subfolder\\Text.txt", "hello 中文");
        storage.Move("X:\\Users\\Default\\Documents\\Folder", "X:\\Users\\Default\\Documents\\Renamed");
        Assert.Equal("hello 中文", storage.ReadText("X:\\Users\\Default\\Documents\\Renamed\\Subfolder\\Text.txt"));
        Assert.False(storage.Exists("X:\\Users\\Default\\Documents\\Folder"));
        Assert.Throws<IOException>(() => storage.Move("X:\\Users\\Default\\Documents\\Renamed", "X:\\Users\\Default\\Documents\\Renamed\\Child"));
        Assert.Throws<IOException>(() => storage.Delete("X:\\Users\\Default\\Documents\\Renamed"));
        Assert.True(storage.Exists("X:\\Users\\Default\\Documents\\Renamed\\Subfolder\\Text.txt"));
    }

    [Fact]
    public void FileCannotReplaceDirectoryOrCreateOrphan()
    {
        var storage = new MemoryWorkspace(false);
        Assert.Throws<IOException>(() => storage.WriteText(SystemPaths.Documents, "bad"));
        Assert.Throws<DirectoryNotFoundException>(() => storage.WriteText("X:\\Missing\\Text.txt", "bad"));
        storage.WriteText(SystemPaths.Combine(SystemPaths.Documents, "Case.txt"), "first");
        storage.WriteText(SystemPaths.Combine(SystemPaths.Documents, "case.txt"), "second");
        Assert.Single(storage.List(SystemPaths.Documents));
        Assert.Equal("second", storage.ReadText(SystemPaths.Combine(SystemPaths.Documents, "CASE.txt")));
    }

    [Fact]
    public void BinaryProgramsAreSeparateFromTextAndMovesRetainExactBytes()
    {
        var storage = new MemoryWorkspace(false);
        var source = SystemPaths.Combine(SystemPaths.Programs, "Hello.dll");
        byte[] image = [0x4D, 0x5A, 0x00, 0xFF];
        storage.WriteBytes(source, image);
        image[0] = 0;
        Assert.Equal(0x4D, storage.ReadBytes(source)[0]);
        Assert.Throws<IOException>(() => storage.ReadText(source));
        var target = SystemPaths.Combine(SystemPaths.Programs, "Renamed.dll");
        storage.Move(source, target);
        Assert.False(storage.Exists(source));
        Assert.Equal(new byte[] { 0x4D, 0x5A, 0x00, 0xFF }, storage.ReadBytes(target));
        Assert.Equal(4, Assert.Single(storage.List(SystemPaths.Programs)).Length);
        storage.Delete(target);
        Assert.False(storage.Exists(target));
    }

    [Fact]
    public void MovingLongDescendantRejectsBeforeRemovingAnySource()
    {
        var storage = new MemoryWorkspace(false);
        var child = "X:\\From\\" + string.Join('\\', Enumerable.Repeat(new string('a', 120), 7)) + "\\File.txt";
        storage.CreateDirectory(SystemPaths.Parent(child));
        storage.WriteText(child, "preserved");
        var parent = "X:\\" + new string('b', 120) + "\\" + new string('c', 120);
        storage.CreateDirectory(parent);
        var destination = SystemPaths.Combine(parent, "Renamed");
        Assert.Throws<ArgumentException>(() => storage.Move("X:\\From", destination));
        Assert.Equal("preserved", storage.ReadText(child));
        Assert.False(storage.Exists(destination));
    }
}