using System.Text;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace IRCTokens.Tests
{
    [TestClass]
    public class StatefulEncoder
    {
        private IRCTokens.StatefulEncoder _encoder;

        [TestInitialize]
        public void Initialize()
        {
            _encoder = new IRCTokens.StatefulEncoder();
        }

        [TestMethod]
        public void Push()
        {
            var line = new Line("PRIVMSG #channel hello");
            _encoder.Push(line);
            Assert.AreEqual("PRIVMSG #channel hello\r\n", _encoder.Pending());
        }

        [TestMethod]
        public void PopPartial()
        {
            var line = new Line("PRIVMSG #channel hello");
            _encoder.Push(line);
            _encoder.Pop("PRIVMSG #channel hello".Length);
            Assert.AreEqual("\r\n", _encoder.Pending());
        }

        [TestMethod]
        public void TestPopReturned()
        {
            var line = new Line("PRIVMSG #channel hello");
            _encoder.Push(line);
            _encoder.Push(line);
            var lines = _encoder.Pop("PRIVMSG #channel hello\r\n".Length);
            Assert.AreEqual(1, lines.Count);
            Assert.AreEqual(line, lines[0]);
        }

        [TestMethod]
        public void PopNoneReturned()
        {
            var line = new Line("PRIVMSG #channel hello");
            _encoder.Push(line);
            var lines = _encoder.Pop(1);
            Assert.AreEqual(0, lines.Count);
        }

        [TestMethod]
        public void 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);
            Assert.AreEqual(2, lines.Count);
            Assert.AreEqual(string.Empty, _encoder.Pending());
        }

        [TestMethod]
        public void Clear()
        {
            _encoder.Push(new Line("PRIVMSG #channel hello"));
            _encoder.Clear();
            Assert.AreEqual(string.Empty, _encoder.Pending());
        }

        [TestMethod]
        public void EncodingIso8859()
        {
            var iso8859 = Encoding.GetEncoding("iso-8859-1");
            _encoder = new IRCTokens.StatefulEncoder {Encoding = iso8859};
            _encoder.Push(new Line("PRIVMSG #channel :hello Ç"));
            CollectionAssert.AreEqual(iso8859.GetBytes("PRIVMSG #channel :hello Ç\r\n"), _encoder.PendingBytes);
        }
    }
}