/*
 * Copyright (c) 2023 Proton AG
 *
 * This file is part of ProtonVPN.
 *
 * ProtonVPN is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ProtonVPN is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ProtonVPN.  If not, see <https://www.gnu.org/licenses/>.
 */

using System.Diagnostics.CodeAnalysis;
using System.Text;
using FluentAssertions;
using NSubstitute;
using ProtonVPN.Client.Logic.Feedback.Attachments;
using File = ProtonVPN.Api.Contracts.File;

namespace ProtonVPN.Client.Logic.Feedback.Tests.Attachments;

[TestClass]
[SuppressMessage("ReSharper", "ReturnValueOfPureMethodIsNotUsed")]
public class AttachmentsToApiFilesTest
{
    private IEnumerable<Attachment>? _source;

    [TestInitialize]
    public void TestInitialize()
    {
        _source = Substitute.For<IEnumerable<Attachment>>();
    }

    [TestCleanup]
    public void Cleanup()
    {
        _source = null;
    }

    [TestMethod]
    public void Enumerable_ShouldBeEmpty_WhenSource_IsEmpty()
    {
        // Arrange
        _source!.GetEnumerator().Returns(Enumerable.Empty<Attachment>().GetEnumerator());
        AttachmentsToApiFiles converter = new(_source);
        // Act
        List<File> result = converter.ToList();
        // Assert
        result.Should().BeEmpty();
    }

    [TestMethod]
    public void Enumerable_ItemName_ShouldBe_SourceName()
    {
        // Arrange
        string[] fileNames = { "bug-report-test.txt", "bug-report-test-2.txt", "bug-report-test-3.txt" };
        IEnumerable<Attachment> attachments = fileNames.Select(f => new Attachment($"TestData\\{f}"));
        _source!.GetEnumerator().Returns(attachments.GetEnumerator());
        AttachmentsToApiFiles converter = new AttachmentsToApiFiles(_source);
        // Act
        List<File> result = converter.ToList();
        // Assert
        result.Select(i => i.Name).Should().BeEquivalentTo(fileNames);
    }

    [TestMethod]
    public void Enumerable_ItemContent_ShouldBe_BinaryFileContent()
    {
        // Arrange
        Attachment[] attachments = { new("TestData\\bug-report-test-3.txt") };
        _source!.GetEnumerator().Returns(attachments.Cast<Attachment>().GetEnumerator());
        byte[] expected = Encoding.UTF8.GetPreamble().Concat(Encoding.UTF8.GetBytes("bug-report-test-3")).ToArray();
        AttachmentsToApiFiles converter = new(_source);
        // Act
        List<File> result = converter.ToList();
        // Assert
        result.First().Content.Should().Equal(expected);
    }

    [TestMethod]
    public void Enumerable_ShouldThrow_WhenDirectory_NotExists()
    {
        // Arrange
        Attachment[] attachments = { new("Lost folder\\test.txt") };
        _source!.GetEnumerator().Returns(attachments.Cast<Attachment>().GetEnumerator());
        AttachmentsToApiFiles converter = new(_source);
        // Act
        Action action = () => converter.ToList();
        // Assert
        action.Should().Throw<DirectoryNotFoundException>();
    }

    [TestMethod]
    public void Enumerable_ShouldThrow_WhenFile_NotExists()
    {
        // Arrange
        Attachment[] attachments = { new Attachment("TestData\\not-a-test.txt") };
        _source!.GetEnumerator().Returns(attachments.Cast<Attachment>().GetEnumerator());
        AttachmentsToApiFiles converter = new(_source);
        // Act
        Action action = () => converter.ToList();
        // Assert
        action.Should().Throw<FileNotFoundException>();
    }
}