using System;
using RecrownedGTK.Tools.CommandProcessor;
using NUnit.Framework;

namespace RecrownedGTK.Tools.Tests.CommandProcessor {
    public class EngineCommandTest {
        string[] fakeArguments;
        DummyInput dummyInput;
        DummyOutput dummyOutput;
        DummyCommand dummyCommand;
        EngineCommandArgument dummyCommandArgument;
        private class DummyInput : IUserInput {
            public string dummyInput;
            public string GetInput() {
                return dummyInput;
            }
        }

        private class DummyOutput : IUserOutput
        {
            public bool cleared;
            public string output;
            public string wrappedOutput;
            public void ClearOutput()
            {
                cleared = true;
            }

            public void Output(string output)
            {
                this.output = output;
            }

            public void WrappedOutput(string output)
            {
                this.wrappedOutput = output;
            }
        }

        private class DummyCommand : EngineCommand
        {
            public DummyCommand(string invoker, params EngineCommandArgument[] engineCommandArguments) : base("helped", invoker) {
                this.commandArguments = engineCommandArguments;
            }

            public override bool Run(IUserInput userInput, IUserOutput userOutput, params string[] arguments)
            {
                if (arguments != null && arguments[0] != null) {
                    userOutput.Output(arguments[0] + " argument");
                } else {
                    userOutput.Output(userInput.GetInput() + " input");
                }
                return true;
            }
        }

        [SetUp]
        public void Setup()
        {
            dummyInput = new DummyInput();
            dummyOutput = new DummyOutput();
            dummyCommandArgument = new EngineCommandArgument("arg", "arg help", false);
            dummyCommand = new DummyCommand("invoke", dummyCommandArgument);
        }

        [OneTimeSetUp]
        public void InitialSetup() {
            fakeArguments = new string[] {"fake1", "fake2", "fake3", "fake4", "fake5", "fake6", "arg"};
        }

        [Test]
        public void RunTestNoArguments() {
            dummyInput.dummyInput = "input";
            dummyCommand.Run(dummyInput, dummyOutput, null);
            Assert.AreEqual(dummyOutput.output, "input input");
        }

        [Test]
        public void RunTestWithArguments() {
            dummyCommand.Run(dummyInput, dummyOutput, "args");
            Assert.AreEqual(dummyOutput.output, "args argument");
        }

        public void EngineCommandArgumentOfTestValid() {
            Assert.AreEqual(dummyCommandArgument, dummyCommand.EngineCommandArgumentOf("args"));
        }

        public void EngineCommandArgumentOfTestNull() {
            Assert.IsNull(dummyCommand.EngineCommandArgumentOf("nothing here"));
        }

        [Test]
        public void ValidateTestFalse() {
            Assert.IsFalse(dummyCommand.Validate("notexisting"));
        }

        [Test]
        public void ValidateTestTrue() {
            Assert.IsTrue(dummyCommand.Validate("arg"));
        }

        [Test]
        public void IndexOfArgumentTestInvald() {
            try {
                EngineCommand.IndexOfArgument("fake argument", new string[] {"argument", "argument_again"});
            } catch (ArgumentException) {
                Assert.Pass();
            }
            Assert.Fail();
        }

        [TestCase("fake1", 0)]
        [TestCase("fake3", 2)]
        [TestCase("fake6", 5)]
        [TestCase("arg", 6)]
        public void IndexOfArgumentTestValidWithString(string argument, int expected) {
            Assert.AreEqual(EngineCommand.IndexOfArgument(argument, this.fakeArguments), expected);
        }

        [Test]
        public void IndexOfArgumentTestValidWithObject() {
            Assert.AreEqual(6, EngineCommand.IndexOfArgument(dummyCommandArgument, fakeArguments));
        }

        [TestCase("fake1", true)]
        [TestCase("fake3", true)]
        [TestCase("arg", true)]
        [TestCase("fake8", false)]
        public void HasArgumentTest(string argument, bool expected) {
            Assert.AreEqual(EngineCommand.HasArgument(argument, fakeArguments), expected);
        }

        [Test]
        public void HelpTestNoArgument() {
            string expected = "helped\nPossible arguments: arg. (* are required arguments.)\n";
            Assert.AreEqual(expected, dummyCommand.Help().Replace("\r", ""));
        }

        [Test]
        public void HelpTestArgument() {
            Assert.AreEqual(dummyCommand.Help("arg"), "arg help");
        }
    }
}