using YamlDotNet.Serialization;
using YamlDotNet.Serialization.NamingConventions;

// ReSharper disable CollectionNeverUpdated.Global
// ReSharper disable ClassNeverInstantiated.Global

namespace IRCSharp.Tests.Tokenization;

public class Parser
{
    [Test]
    [YamlDataGenerator<TestCase>("Tokenization/Data/msg-split.yaml")]
    [ArgumentDisplayFormatter<TestCase>]
    public async Task Split(TestCase test)
    {
        var atoms = test.Atoms;
        var line  = new Line(test.Input);

        await Assert.That(line.Command).IsEqualTo(atoms.Verb.ToUpperInvariant())
            .Because($"command failed on: '{test.Input}'");

        await Assert.That(line.Source).IsEqualTo(atoms.Source)
            .Because($"source failed on: '{test.Input}'");

        await Assert.That(line.Params).IsEquivalentTo(atoms.Params ?? [])
            .Because($"params failed on: '{test.Input}'");

        if (atoms.Tags is null)
        {
            await Assert.That(line.Tags).IsNull()
                .Because("tags should be null");
        }
        else
        {
            await Assert.That(line.Tags).IsEquivalentTo(atoms.Tags)
                .Because($"tags failed on: '{test.Input}'");
        }
    }

    [Test]
    [YamlDataGenerator<TestCase>("Tokenization/Data/msg-join.yaml")]
    [ArgumentDisplayFormatter<TestCase>]
    public async Task Join(TestCase test)
    {
        var atoms = test.Atoms;
        var line  = new Line { Command = atoms.Verb, Params = atoms.Params, Source = atoms.Source, Tags = atoms.Tags };

        await Assert.That(test.Matches).Contains(line.Format()).Because(test.Description);
    }
}

public class YamlDataGeneratorAttribute<T>(string yamlPath) : AsyncDataSourceGeneratorAttribute<T>
    where T : class
{
    private readonly IDeserializer _deserializer = new DeserializerBuilder()
        .WithNamingConvention(CamelCaseNamingConvention.Instance)
        .Build();

    protected override async IAsyncEnumerable<Func<Task<T>>> GenerateDataSourcesAsync(
        DataGeneratorMetadata dataGeneratorMetadata)
    {
        foreach (var item in _deserializer.Deserialize<List<T>>(await File.ReadAllTextAsync(yamlPath)))
            yield return () => Task.FromResult(item);
    }
}

public class TestCase : ArgumentDisplayFormatter
{
    [YamlMember(Alias = "desc")]
    public string Description { get; set; }
    public Atoms Atoms { get; set; }
    public List<string> Matches { get; set; }
    public string Input { get; set; }
    public override bool CanHandle(object value) => value is TestCase;
    public override string FormatValue(object value)
    {
        var testCase = (TestCase)value!;
        return testCase.Input ?? testCase.Description;
    }
}

public class Atoms
{
    public Dictionary<string, string> Tags { get; set; }
    public string Source { get; set; }
    public string Verb { get; set; }
    public List<string> Params { get; set; }
}