using System;
using System.Linq;
using NUnit.Framework;
using PorygonSharp;
using PorygonSharp.UserData;

namespace PorygonSharpTests
{
    [TestFixture]
    public class UserDataTests
    {
        private class UserDataTestObject
        {
            public int Foo = 200;
            public int Bar { get; set; }
            public int GetOnly { get; } = 865;
            public readonly int ReadOnly = 684;

            public int[] IntArray = {55, 60, 846, 346846};

            public int TestFunc()
            {
                return 345435;
            }

            public int Add(int a, int b)
            {
                return a + b;
            }
        }

        [Test]
        public void CanGetFromUserDataField()
        {
            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
            using (var script = new Script(@"
function test(testObject v)
    result = v['Foo']
end
"))
            {
                var diags = script.Diagnostics.GetDiagnostics();
                foreach (var diag in diags)
                {
                    throw new Exception(script.Diagnostics.GetFullDiagnosticMessage(diag));
                }

                script.Evaluate();

                script.CallFunction("test", new UserDataTestObject());
                var variable = script.GetVariable("result");
                Assert.AreEqual(200, variable.EvaluateInteger());
            }
        }

        [Test]
        public void CanSetToUserDataField()
        {
            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
            using (var script = new Script(@"
function test(testObject v)
    v['Foo'] = 20000
end
"))
            {
                var diags = script.Diagnostics.GetDiagnostics();
                foreach (var diag in diags)
                {
                    throw new Exception(script.Diagnostics.GetFullDiagnosticMessage(diag));
                }

                script.Evaluate();

                var parameter = new UserDataTestObject();
                script.CallFunction("test", parameter);
                Assert.AreEqual(20000, parameter.Foo);
            }
        }

        [Test]
        public void CanGetFromPropertyWithoutSetter()
        {
            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
            using (var script = new Script(@"
function test(testObject v)
    result = v['GetOnly']
end
"))
            {
                var diags = script.Diagnostics.GetDiagnostics();
                foreach (var diag in diags)
                {
                    throw new Exception(script.Diagnostics.GetFullDiagnosticMessage(diag));
                }

                script.Evaluate();

                var parameter = new UserDataTestObject();
                script.CallFunction("test", parameter);
                Assert.AreEqual(865, script.GetVariable("result").EvaluateInteger());
            }
        }

        [Test]
        public void CantSetToPropertyWithoutSetter()
        {
            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
            using (var script = new Script(@"
function test(testObject v)
    v['GetOnly'] = 10000
end
"))
            {
                var diags = script.Diagnostics.GetDiagnostics().ToArray();
                Assert.IsNotEmpty(diags);
                Assert.AreEqual(1, diags.Length);
            }
        }


        [Test]
        public void CanGetFromReadonlyField()
        {
            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
            using (var script = new Script(@"
function test(testObject v)
    result = v['ReadOnly']
end
"))
            {
                var diags = script.Diagnostics.GetDiagnostics();
                foreach (var diag in diags)
                {
                    throw new Exception(script.Diagnostics.GetFullDiagnosticMessage(diag));
                }

                script.Evaluate();

                var parameter = new UserDataTestObject();
                script.CallFunction("test", parameter);
                Assert.AreEqual(684, script.GetVariable("result").EvaluateInteger());
            }
        }

        [Test]
        public void CantSetToReadonlyField()
        {
            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
            using (var script = new Script(@"
function test(testObject v)
    v['ReadOnly'] = 10000
end
"))
            {
                var diags = script.Diagnostics.GetDiagnostics().ToArray();
                Assert.IsNotEmpty(diags);
                Assert.AreEqual(1, diags.Length);
            }
        }

        [Test]
        public void CanCallUserdataFunction()
        {
            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
            using (var script = new Script(@"
function test(testObject v)
    result = v.TestFunc()
end
"))
            {
                var diags = script.Diagnostics.GetDiagnostics();
                foreach (var diag in diags)
                {
                    throw new Exception(script.Diagnostics.GetFullDiagnosticMessage(diag));
                }

                script.Evaluate();

                var parameter = new UserDataTestObject();

                script.CallFunction("test", parameter);
                var variable = script.GetVariable("result");
                Assert.AreEqual(TypeClass.Number ,variable.GetTypeClass());
                Assert.AreEqual(345435, script.GetVariable("result").EvaluateInteger());
            }
        }

        [Test]
        public void CanCallUserdataFunctionWithArguments()
        {
            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
            using (var script = new Script(@"
function test(testObject v)
    result = v.Add(5, 200)
end
"))
            {
                var diags = script.Diagnostics.GetDiagnostics();
                foreach (var diag in diags)
                {
                    throw new Exception(script.Diagnostics.GetFullDiagnosticMessage(diag));
                }

                script.Evaluate();

                var parameter = new UserDataTestObject();

                script.CallFunction("test", parameter);
                var variable = script.GetVariable("result");
                Assert.AreEqual(TypeClass.Number ,variable.GetTypeClass());
                Assert.AreEqual(205, script.GetVariable("result").EvaluateInteger());
            }
        }

        [Test]
        public void CanGetFromArray()
        {
            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
            using (var script = new Script(@"
function test(testObject v)
    return v.IntArray[3]
end
"))
            {
                var diags = script.Diagnostics.GetDiagnostics();
                foreach (var diag in diags)
                {
                    throw new Exception(script.Diagnostics.GetFullDiagnosticMessage(diag));
                }

                script.Evaluate();
                var parameter = new UserDataTestObject();
                var result = script.CallFunction("test", parameter);
                Assert.AreEqual(846, result.EvaluateInteger());
            }
        }
        
        [Test]
        public void CanSetToArray()
        {
            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
            using (var script = new Script(@"
function test(testObject v)
    v.IntArray[2] = 256
end
"))
            {
                var diags = script.Diagnostics.GetDiagnostics();
                foreach (var diag in diags)
                {
                    throw new Exception(script.Diagnostics.GetFullDiagnosticMessage(diag));
                }

                script.Evaluate();
                var parameter = new UserDataTestObject();
                script.CallFunction("test", parameter);
                Assert.AreEqual(256, parameter.IntArray[1]);
            }
        }
        
        [Test]
        public void CanIterateOverArrayKeys()
        {
            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
            using (var script = new Script(@"
function test(testObject v)
    value = 0
    for i in v.IntArray do
        value = value + i
    end
    return value
end
"))
            {
                var diags = script.Diagnostics.GetDiagnostics();
                foreach (var diag in diags)
                {
                    throw new Exception(script.Diagnostics.GetFullDiagnosticMessage(diag));
                }

                script.Evaluate();
                var parameter = new UserDataTestObject();
                var result = script.CallFunction("test", parameter);
                Assert.AreEqual(10, result.EvaluateInteger());
            }
        }
        
        [Test]
        public void CanIterateOverArrayValues()
        {
            UserDataHandler.RegisterType("testObject", typeof(UserDataTestObject));
            using (var script = new Script(@"
function test(testObject v)
    value = 0
    for i, j in v.IntArray do
        value = value + j
    end
    return value
end
"))
            {
                var diags = script.Diagnostics.GetDiagnostics();
                foreach (var diag in diags)
                {
                    throw new Exception(script.Diagnostics.GetFullDiagnosticMessage(diag));
                }

                script.Evaluate();
                var parameter = new UserDataTestObject();
                var result = script.CallFunction("test", parameter);
                Assert.AreEqual(347807, result.EvaluateInteger());
            }
        }
    }
}