using System.Text;
using System.Text.RegularExpressions;

namespace Sharp.Augeas.Test;

public class AugeasTests
{
    private Augeas _augeas;

    private const string EXAMPLE_CONF_1 = "/etc/apache2/sites-available/example.com.conf";
    private const string EXAMPLE_CONF_2 = "/etc/apache2/sites-available/example2.com.conf";

    public static string RandomString(int length)
    {
        var random = new Random();
        const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        return new string(Enumerable.Repeat(chars, length)
            .Select(s => s[random.Next(s.Length)]).ToArray());
    }


    [SetUp]
    public void Setup()
    {
        var rootDir = Environment.CurrentDirectory + "/root";
        var lensDir = Environment.CurrentDirectory + "/lens";
        _augeas = new Augeas(new AugSettings(rootDir, lensDir));
        _augeas.LoadFile(EXAMPLE_CONF_1);
        _augeas.LoadFile(EXAMPLE_CONF_2);
    }

    [Test]
    public void GetTreeHasDirectivesAndArguments()
    {
        var tree = _augeas.GetTree("VirtualHost", $"/files{EXAMPLE_CONF_1}/VirtualHost/*");
        Assert.That(tree.Arguments.Count > 0 && tree.Directives.Count > 0);
    }

    [Test]
    public void NoExceptionThrownWhenPrintingPreview()
    {
        var virtualHostConfig = EXAMPLE_CONF_1;
        _augeas.PrintPreview(virtualHostConfig);
        Assert.Pass();
    }

    [Test]
    public void GetPreviewReturnsValid()
    {
        var preview = _augeas.GetPreview("/files/etc/apache2/sites-available/example.com.conf");
        var stringInvalid = string.IsNullOrEmpty(preview);
        Assert.That(!stringInvalid);
    }


    [Test]
    public void AfterSettingNodeGetNodeReturnsNewValue()
    {
        var nodePath = $"/files/etc/apache2/sites-available/example.com.conf/VirtualHost/directive[1]/arg";
        var newValue = "example.com";
        _augeas.SetNode(nodePath, newValue);
        var retrieveVal = _augeas.GetNode(nodePath);
        Assert.That(retrieveVal == newValue);
    }


    [Test]
    public void SettingNodeAndSave()
    {
        var nodePath = $"/files/etc/apache2/sites-available/example.com.conf/VirtualHost/directive[1]/arg";
        var newValue = RandomString(10);
        _augeas.SetNode(nodePath, newValue);
        var successSaving = _augeas.Save();
        if (!successSaving)
        {
            Assert.Fail("Unable to write changes to disk.");
        }

        var retrieveVal = _augeas.GetNode(nodePath);
        Assert.That(retrieveVal == newValue);
    }


    [Test]
    public void InsertNode()
    {
        var nodePath = $"/files/etc/apache2/sites-available/example.com.conf/VirtualHost/directive[3]";
        _augeas.InsertNode(nodePath, "Test");
        var node = _augeas.GetNode(nodePath);

        Assert.Pass();
    }


    [Test]
    public void MatchReturnsTwoSites()
    {
        var sites = _augeas.Match("/files/etc/apache2/sites-available/*");
        Assert.That(sites.Length == 2);
    }


    [Test]
    public void MatchCanReturnMultipleDirectives()
    {
        var nodePath = $"/files/etc/apache2/sites-available/example.com.conf/VirtualHost/directive[7]/*";
        var sites = _augeas.Match(nodePath);
        Assert.That(sites.Length > 0);
    }

}