namespace IRCSharp.Tests.Tokenization;

public class StatefulEncoder
{
    private readonly IRCTokens.StatefulEncoder _encoder = new();

    [Test]
    public async Task Push()
    {
        var line = new Line("PRIVMSG #channel hello");
        _encoder.Push(line);
        await Assert.That(_encoder.Pending()).IsEqualTo("PRIVMSG #channel hello\r\n");
    }

    [Test]
    public async Task PopPartial()
    {
        var line = new Line("PRIVMSG #channel hello");
        _encoder.Push(line);
        _encoder.Pop("PRIVMSG #channel hello".Length);
        await Assert.That(_encoder.Pending()).IsEqualTo("\r\n");
    }

    [Test]
    public async Task TestPopReturned()
    {
        var line = new Line("PRIVMSG #channel hello");
        _encoder.Push(line);
        _encoder.Push(line);
        var lines = _encoder.Pop("PRIVMSG #channel hello\r\n".Length);
        await Assert.That(lines).HasCount(1);
        await Assert.That(lines[0]).IsEqualTo(line);
    }

    [Test]
    public async Task PopNoneReturned()
    {
        var line = new Line("PRIVMSG #channel hello");
        _encoder.Push(line);
        var lines = _encoder.Pop(1);
        await Assert.That(lines).IsEmpty();
    }

    [Test]
    public async Task PopMultipleLines()
    {
        var line1 = new Line("PRIVMSG #channel1 hello");
        _encoder.Push(line1);
        var line2 = new Line("PRIVMSG #channel2 hello");
        _encoder.Push(line2);

        var lines = _encoder.Pop(_encoder.Pending().Length);
        await Assert.That(lines).HasCount(2);
        await Assert.That(_encoder.Pending()).IsEmpty();
    }

    [Test]
    public async Task Clear()
    {
        _encoder.Push(new Line("PRIVMSG #channel hello"));
        _encoder.Clear();
        await Assert.That(_encoder.Pending()).IsEmpty();
    }

    [Test]
    public async Task EncodingIso8859()
    {
        var encoder = new IRCTokens.StatefulEncoder {Encoding = Encoding.Latin1};
        encoder.Push(new Line("PRIVMSG #channel :hello Ç"));
        await Assert.That(encoder.PendingBytes).IsEquivalentTo(Encoding.Latin1.GetBytes("PRIVMSG #channel :hello Ç\r\n"));
    }
}