using Upsilon.BaseTypes;
using Upsilon.BaseTypes.Number;
using Upsilon.Evaluator;
using Xunit;

namespace UpsilonTests
{
    public class FunctionTests
    {
        [Fact]
        public void BasicFunctionTest()
        {
            const string input = @"
function testFunc ()
    a = 100
end
a = 50
testFunc()
";
            var script = new Script(input);
            Assert.Empty(script.Diagnostics.Messages);
            script.Evaluate();
            Assert.Empty(script.Diagnostics.Messages);
            Assert.True(script.Scope.TryGet("testFunc", out var func));
            Assert.IsType<LuaFunction>(func);
            Assert.True(script.Scope.TryGet("a", out var a));
            Assert.Equal(100, (long)(NumberLong)a);
        }

        [Fact]
        public void ParameterTest()
        {
            const string input = @"
function testFunc (var1)
    a = var1
end
a = 50
testFunc(100)
";
            var script = new Script(input);
            Assert.Empty(script.Diagnostics.Messages);
            script.Evaluate();
            Assert.Empty(script.Diagnostics.Messages);
            Assert.True(script.Scope.TryGet("testFunc", out var func));
            Assert.IsType<LuaFunction>(func);
            Assert.True(script.Scope.TryGet("a", out var a));
            Assert.Equal(100, (long)(NumberLong)a);
        }

        [Fact]
        public void ParameterBindTest()
        {
            const string input = @"
function testFunc (var1)
    var1 == true
end
testFunc(100)
";
            var script = new Script(input);
            Assert.Empty(script.Diagnostics.Messages);
            script.Evaluate();
            Assert.Single(script.Diagnostics.Messages);
            Assert.True(script.Scope.TryGet("testFunc", out var func));
            Assert.IsType<LuaFunction>(func);
        }

        [Fact]
        public void BindUnusedFunctions()
        {
            const string input = @"
function testFunc (var1)
    var1 == true
end
";
            var script = new Script(input);
            Assert.Empty(script.Diagnostics.Messages);
            script.Evaluate();
            Assert.Empty(script.Diagnostics.Messages);
            Assert.True(script.Scope.TryGet("testFunc", out var func));
            var castType = Assert.IsType<LuaFunction>(func);
            Assert.NotNull(castType.Block);
        }

    }
}