using NfProcessorApp.Services;
using Xunit;

namespace NfProcessorApp.Tests.Services
{
    public class FileScannerTests
    {
        private readonly FileScanner _scanner = new();

        [Fact]
        public void ListFiles_InvalidFolder_ThrowsDirectoryNotFoundException()
        {
            Assert.Throws<DirectoryNotFoundException>(() => _scanner.ListFiles("nonexistent", [".xml"]).ToList());
        }

        [Fact]
        public void ListFiles_FiltersByExtension_OnlyReturnsMatchingFiles()
        {
            // Arrange: create temporary folder with files
            var temp = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
            Directory.CreateDirectory(temp);
            File.WriteAllText(Path.Combine(temp, "a.xml"), "");
            File.WriteAllText(Path.Combine(temp, "b.pdf"), "");
            File.WriteAllText(Path.Combine(temp, "c.txt"), "");

            // Act
            var result = _scanner.ListFiles(temp, [".xml", ".pdf"]).ToList();

            // Assert
            Assert.Contains(Path.Combine(temp, "a.xml"), result);
            Assert.Contains(Path.Combine(temp, "b.pdf"), result);
            Assert.DoesNotContain(Path.Combine(temp, "c.txt"), result);

            // Cleanup
            Directory.Delete(temp, true);
        }
    }
}