"""
Test that the type of arguments to C++ template classes that have variadic
parameters can be enumerated.
"""
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil


class TemplatePackArgsTestCase(TestBase):

    mydir = TestBase.compute_mydir(__file__)

    def test_template_argument_pack(self):
        self.build()
        (_, _, thread, _) = lldbutil.run_to_source_breakpoint(self,
          'breakpoint here', lldb.SBFileSpec('main.cpp'), exe_name = 'a.out')
        frame = thread.GetSelectedFrame()

        empty_pack = frame.FindVariable('emptyPack')
        self.assertTrue(empty_pack.IsValid(),
                        'make sure we find the emptyPack variable')

        only_pack = frame.FindVariable('onlyPack')
        self.assertTrue(only_pack.IsValid(),
                        'make sure we find the onlyPack variable')
        self.assertEqual(only_pack.GetType().GetNumberOfTemplateArguments(), 4)
        self.assertEqual(only_pack.GetType().GetTemplateArgumentType(0).GetName(), 'int')
        self.assertEqual(only_pack.GetType().GetTemplateArgumentType(1).GetName(), 'char')
        self.assertEqual(only_pack.GetType().GetTemplateArgumentType(2).GetName(), 'double')
        # Access the C<double, 42> template parameter.
        nested_template = only_pack.GetType().GetTemplateArgumentType(3)
        self.assertEqual(nested_template.GetName(), 'D<int, int, bool>')
        self.assertEqual(nested_template.GetNumberOfTemplateArguments(), 3)
        self.assertEqual(nested_template.GetTemplateArgumentType(0).GetName(), 'int')
        self.assertEqual(nested_template.GetTemplateArgumentType(1).GetName(), 'int')
        self.assertEqual(nested_template.GetTemplateArgumentType(2).GetName(), 'bool')
