import ctypes
import gc
import unittest

from clang.cindex import AvailabilityKind
from clang.cindex import CursorKind
from clang.cindex import TemplateArgumentKind
from clang.cindex import TranslationUnit
from clang.cindex import TypeKind
from .util import get_cursor
from .util import get_cursors
from .util import get_tu


kInput = """\
struct s0 {
  int a;
  int b;
};

struct s1;

void f0(int a0, int a1) {
  int l0, l1;

  if (a0)
    return;

  for (;;) {
    break;
  }
}
"""

kParentTest = """\
        class C {
            void f();
        }

        void C::f() { }
    """

kTemplateArgTest = """\
        template <int kInt, typename T, bool kBool>
        void foo();

        template<>
        void foo<-7, float, true>();
    """

class TestCursor(unittest.TestCase):
    def test_get_children(self):
        tu = get_tu(kInput)

        it = tu.cursor.get_children()
        tu_nodes = list(it)

        self.assertEqual(len(tu_nodes), 3)
        for cursor in tu_nodes:
            self.assertIsNotNone(cursor.translation_unit)

        self.assertNotEqual(tu_nodes[0], tu_nodes[1])
        self.assertEqual(tu_nodes[0].kind, CursorKind.STRUCT_DECL)
        self.assertEqual(tu_nodes[0].spelling, 's0')
        self.assertEqual(tu_nodes[0].is_definition(), True)
        self.assertEqual(tu_nodes[0].location.file.name, 't.c')
        self.assertEqual(tu_nodes[0].location.line, 1)
        self.assertEqual(tu_nodes[0].location.column, 8)
        self.assertGreater(tu_nodes[0].hash, 0)
        self.assertIsNotNone(tu_nodes[0].translation_unit)

        s0_nodes = list(tu_nodes[0].get_children())
        self.assertEqual(len(s0_nodes), 2)
        self.assertEqual(s0_nodes[0].kind, CursorKind.FIELD_DECL)
        self.assertEqual(s0_nodes[0].spelling, 'a')
        self.assertEqual(s0_nodes[0].type.kind, TypeKind.INT)
        self.assertEqual(s0_nodes[1].kind, CursorKind.FIELD_DECL)
        self.assertEqual(s0_nodes[1].spelling, 'b')
        self.assertEqual(s0_nodes[1].type.kind, TypeKind.INT)

        self.assertEqual(tu_nodes[1].kind, CursorKind.STRUCT_DECL)
        self.assertEqual(tu_nodes[1].spelling, 's1')
        self.assertEqual(tu_nodes[1].displayname, 's1')
        self.assertEqual(tu_nodes[1].is_definition(), False)

        self.assertEqual(tu_nodes[2].kind, CursorKind.FUNCTION_DECL)
        self.assertEqual(tu_nodes[2].spelling, 'f0')
        self.assertEqual(tu_nodes[2].displayname, 'f0(int, int)')
        self.assertEqual(tu_nodes[2].is_definition(), True)

    def test_references(self):
        """Ensure that references to TranslationUnit are kept."""
        tu = get_tu('int x;')
        cursors = list(tu.cursor.get_children())
        self.assertGreater(len(cursors), 0)

        cursor = cursors[0]
        self.assertIsInstance(cursor.translation_unit, TranslationUnit)

        # Delete reference to TU and perform a full GC.
        del tu
        gc.collect()
        self.assertIsInstance(cursor.translation_unit, TranslationUnit)

        # If the TU was destroyed, this should cause a segfault.
        parent = cursor.semantic_parent

    def test_canonical(self):
        source = 'struct X; struct X; struct X { int member; };'
        tu = get_tu(source)

        cursors = []
        for cursor in tu.cursor.get_children():
            if cursor.spelling == 'X':
                cursors.append(cursor)

        self.assertEqual(len(cursors), 3)
        self.assertEqual(cursors[1].canonical, cursors[2].canonical)

    def test_is_const_method(self):
        """Ensure Cursor.is_const_method works."""
        source = 'class X { void foo() const; void bar(); };'
        tu = get_tu(source, lang='cpp')

        cls = get_cursor(tu, 'X')
        foo = get_cursor(tu, 'foo')
        bar = get_cursor(tu, 'bar')
        self.assertIsNotNone(cls)
        self.assertIsNotNone(foo)
        self.assertIsNotNone(bar)

        self.assertTrue(foo.is_const_method())
        self.assertFalse(bar.is_const_method())

    def test_is_converting_constructor(self):
        """Ensure Cursor.is_converting_constructor works."""
        source = 'class X { explicit X(int); X(double); X(); };'
        tu = get_tu(source, lang='cpp')

        xs = get_cursors(tu, 'X')

        self.assertEqual(len(xs), 4)
        self.assertEqual(xs[0].kind, CursorKind.CLASS_DECL)
        cs = xs[1:]
        self.assertEqual(cs[0].kind, CursorKind.CONSTRUCTOR)
        self.assertEqual(cs[1].kind, CursorKind.CONSTRUCTOR)
        self.assertEqual(cs[2].kind, CursorKind.CONSTRUCTOR)

        self.assertFalse(cs[0].is_converting_constructor())
        self.assertTrue(cs[1].is_converting_constructor())
        self.assertFalse(cs[2].is_converting_constructor())


    def test_is_copy_constructor(self):
        """Ensure Cursor.is_copy_constructor works."""
        source = 'class X { X(); X(const X&); X(X&&); };'
        tu = get_tu(source, lang='cpp')

        xs = get_cursors(tu, 'X')
        self.assertEqual(xs[0].kind, CursorKind.CLASS_DECL)
        cs = xs[1:]
        self.assertEqual(cs[0].kind, CursorKind.CONSTRUCTOR)
        self.assertEqual(cs[1].kind, CursorKind.CONSTRUCTOR)
        self.assertEqual(cs[2].kind, CursorKind.CONSTRUCTOR)

        self.assertFalse(cs[0].is_copy_constructor())
        self.assertTrue(cs[1].is_copy_constructor())
        self.assertFalse(cs[2].is_copy_constructor())

    def test_is_default_constructor(self):
        """Ensure Cursor.is_default_constructor works."""
        source = 'class X { X(); X(int); };'
        tu = get_tu(source, lang='cpp')

        xs = get_cursors(tu, 'X')
        self.assertEqual(xs[0].kind, CursorKind.CLASS_DECL)
        cs = xs[1:]
        self.assertEqual(cs[0].kind, CursorKind.CONSTRUCTOR)
        self.assertEqual(cs[1].kind, CursorKind.CONSTRUCTOR)

        self.assertTrue(cs[0].is_default_constructor())
        self.assertFalse(cs[1].is_default_constructor())

    def test_is_move_constructor(self):
        """Ensure Cursor.is_move_constructor works."""
        source = 'class X { X(); X(const X&); X(X&&); };'
        tu = get_tu(source, lang='cpp')

        xs = get_cursors(tu, 'X')
        self.assertEqual(xs[0].kind, CursorKind.CLASS_DECL)
        cs = xs[1:]
        self.assertEqual(cs[0].kind, CursorKind.CONSTRUCTOR)
        self.assertEqual(cs[1].kind, CursorKind.CONSTRUCTOR)
        self.assertEqual(cs[2].kind, CursorKind.CONSTRUCTOR)

        self.assertFalse(cs[0].is_move_constructor())
        self.assertFalse(cs[1].is_move_constructor())
        self.assertTrue(cs[2].is_move_constructor())

    def test_is_default_method(self):
        """Ensure Cursor.is_default_method works."""
        source = 'class X { X() = default; }; class Y { Y(); };'
        tu = get_tu(source, lang='cpp')

        xs = get_cursors(tu, 'X')
        ys = get_cursors(tu, 'Y')

        self.assertEqual(len(xs), 2)
        self.assertEqual(len(ys), 2)

        xc = xs[1]
        yc = ys[1]

        self.assertTrue(xc.is_default_method())
        self.assertFalse(yc.is_default_method())

    def test_is_mutable_field(self):
        """Ensure Cursor.is_mutable_field works."""
        source = 'class X { int x_; mutable int y_; };'
        tu = get_tu(source, lang='cpp')

        cls = get_cursor(tu, 'X')
        x_ = get_cursor(tu, 'x_')
        y_ = get_cursor(tu, 'y_')
        self.assertIsNotNone(cls)
        self.assertIsNotNone(x_)
        self.assertIsNotNone(y_)

        self.assertFalse(x_.is_mutable_field())
        self.assertTrue(y_.is_mutable_field())

    def test_is_static_method(self):
        """Ensure Cursor.is_static_method works."""

        source = 'class X { static void foo(); void bar(); };'
        tu = get_tu(source, lang='cpp')

        cls = get_cursor(tu, 'X')
        foo = get_cursor(tu, 'foo')
        bar = get_cursor(tu, 'bar')
        self.assertIsNotNone(cls)
        self.assertIsNotNone(foo)
        self.assertIsNotNone(bar)

        self.assertTrue(foo.is_static_method())
        self.assertFalse(bar.is_static_method())

    def test_is_pure_virtual_method(self):
        """Ensure Cursor.is_pure_virtual_method works."""
        source = 'class X { virtual void foo() = 0; virtual void bar(); };'
        tu = get_tu(source, lang='cpp')

        cls = get_cursor(tu, 'X')
        foo = get_cursor(tu, 'foo')
        bar = get_cursor(tu, 'bar')
        self.assertIsNotNone(cls)
        self.assertIsNotNone(foo)
        self.assertIsNotNone(bar)

        self.assertTrue(foo.is_pure_virtual_method())
        self.assertFalse(bar.is_pure_virtual_method())

    def test_is_virtual_method(self):
        """Ensure Cursor.is_virtual_method works."""
        source = 'class X { virtual void foo(); void bar(); };'
        tu = get_tu(source, lang='cpp')

        cls = get_cursor(tu, 'X')
        foo = get_cursor(tu, 'foo')
        bar = get_cursor(tu, 'bar')
        self.assertIsNotNone(cls)
        self.assertIsNotNone(foo)
        self.assertIsNotNone(bar)

        self.assertTrue(foo.is_virtual_method())
        self.assertFalse(bar.is_virtual_method())

    def test_is_scoped_enum(self):
        """Ensure Cursor.is_scoped_enum works."""
        source = 'class X {}; enum RegularEnum {}; enum class ScopedEnum {};'
        tu = get_tu(source, lang='cpp')

        cls = get_cursor(tu, 'X')
        regular_enum = get_cursor(tu, 'RegularEnum')
        scoped_enum = get_cursor(tu, 'ScopedEnum')
        self.assertIsNotNone(cls)
        self.assertIsNotNone(regular_enum)
        self.assertIsNotNone(scoped_enum)

        self.assertFalse(cls.is_scoped_enum())
        self.assertFalse(regular_enum.is_scoped_enum())
        self.assertTrue(scoped_enum.is_scoped_enum())

    def test_underlying_type(self):
        tu = get_tu('typedef int foo;')
        typedef = get_cursor(tu, 'foo')
        self.assertIsNotNone(typedef)

        self.assertTrue(typedef.kind.is_declaration())
        underlying = typedef.underlying_typedef_type
        self.assertEqual(underlying.kind, TypeKind.INT)

    def test_semantic_parent(self):
        tu = get_tu(kParentTest, 'cpp')
        curs = get_cursors(tu, 'f')
        decl = get_cursor(tu, 'C')
        self.assertEqual(len(curs), 2)
        self.assertEqual(curs[0].semantic_parent, curs[1].semantic_parent)
        self.assertEqual(curs[0].semantic_parent, decl)

    def test_lexical_parent(self):
        tu = get_tu(kParentTest, 'cpp')
        curs = get_cursors(tu, 'f')
        decl = get_cursor(tu, 'C')
        self.assertEqual(len(curs), 2)
        self.assertNotEqual(curs[0].lexical_parent, curs[1].lexical_parent)
        self.assertEqual(curs[0].lexical_parent, decl)
        self.assertEqual(curs[1].lexical_parent, tu.cursor)

    def test_enum_type(self):
        tu = get_tu('enum TEST { FOO=1, BAR=2 };')
        enum = get_cursor(tu, 'TEST')
        self.assertIsNotNone(enum)

        self.assertEqual(enum.kind, CursorKind.ENUM_DECL)
        enum_type = enum.enum_type
        self.assertEqual(enum_type.kind, TypeKind.UINT)

    def test_enum_type_cpp(self):
        tu = get_tu('enum TEST : long long { FOO=1, BAR=2 };', lang="cpp")
        enum = get_cursor(tu, 'TEST')
        self.assertIsNotNone(enum)

        self.assertEqual(enum.kind, CursorKind.ENUM_DECL)
        self.assertEqual(enum.enum_type.kind, TypeKind.LONGLONG)

    def test_objc_type_encoding(self):
        tu = get_tu('int i;', lang='objc')
        i = get_cursor(tu, 'i')

        self.assertIsNotNone(i)
        self.assertEqual(i.objc_type_encoding, 'i')

    def test_enum_values(self):
        tu = get_tu('enum TEST { SPAM=1, EGG, HAM = EGG * 20};')
        enum = get_cursor(tu, 'TEST')
        self.assertIsNotNone(enum)

        self.assertEqual(enum.kind, CursorKind.ENUM_DECL)

        enum_constants = list(enum.get_children())
        self.assertEqual(len(enum_constants), 3)

        spam, egg, ham = enum_constants

        self.assertEqual(spam.kind, CursorKind.ENUM_CONSTANT_DECL)
        self.assertEqual(spam.enum_value, 1)
        self.assertEqual(egg.kind, CursorKind.ENUM_CONSTANT_DECL)
        self.assertEqual(egg.enum_value, 2)
        self.assertEqual(ham.kind, CursorKind.ENUM_CONSTANT_DECL)
        self.assertEqual(ham.enum_value, 40)

    def test_enum_values_cpp(self):
        tu = get_tu('enum TEST : long long { SPAM = -1, HAM = 0x10000000000};', lang="cpp")
        enum = get_cursor(tu, 'TEST')
        self.assertIsNotNone(enum)

        self.assertEqual(enum.kind, CursorKind.ENUM_DECL)

        enum_constants = list(enum.get_children())
        self.assertEqual(len(enum_constants), 2)

        spam, ham = enum_constants

        self.assertEqual(spam.kind, CursorKind.ENUM_CONSTANT_DECL)
        self.assertEqual(spam.enum_value, -1)
        self.assertEqual(ham.kind, CursorKind.ENUM_CONSTANT_DECL)
        self.assertEqual(ham.enum_value, 0x10000000000)

    def test_annotation_attribute(self):
        tu = get_tu('int foo (void) __attribute__ ((annotate("here be annotation attribute")));')

        foo = get_cursor(tu, 'foo')
        self.assertIsNotNone(foo)

        for c in foo.get_children():
            if c.kind == CursorKind.ANNOTATE_ATTR:
                self.assertEqual(c.displayname, "here be annotation attribute")
                break
        else:
            self.fail("Couldn't find annotation")

    def test_annotation_template(self):
        annotation = '__attribute__ ((annotate("annotation")))'
        for source, kind in [
                ('int foo (T value) %s;', CursorKind.FUNCTION_TEMPLATE),
                ('class %s foo {};', CursorKind.CLASS_TEMPLATE),
        ]:
            source = 'template<typename T> ' + (source % annotation)
            tu = get_tu(source, lang="cpp")

            foo = get_cursor(tu, 'foo')
            self.assertIsNotNone(foo)
            self.assertEqual(foo.kind, kind)

            for c in foo.get_children():
                if c.kind == CursorKind.ANNOTATE_ATTR:
                    self.assertEqual(c.displayname, "annotation")
                    break
            else:
                self.fail("Couldn't find annotation for {}".format(kind))

    def test_result_type(self):
        tu = get_tu('int foo();')
        foo = get_cursor(tu, 'foo')

        self.assertIsNotNone(foo)
        t = foo.result_type
        self.assertEqual(t.kind, TypeKind.INT)

    def test_availability(self):
        tu = get_tu('class A { A(A const&) = delete; };', lang='cpp')

        # AvailabilityKind.AVAILABLE
        cursor = get_cursor(tu, 'A')
        self.assertEqual(cursor.kind, CursorKind.CLASS_DECL)
        self.assertEqual(cursor.availability, AvailabilityKind.AVAILABLE)

        # AvailabilityKind.NOT_AVAILABLE
        cursors = get_cursors(tu, 'A')
        for c in cursors:
            if c.kind == CursorKind.CONSTRUCTOR:
                self.assertEqual(c.availability, AvailabilityKind.NOT_AVAILABLE)
                break
        else:
            self.fail("Could not find cursor for deleted constructor")

        # AvailabilityKind.DEPRECATED
        tu = get_tu('void test() __attribute__((deprecated));', lang='cpp')
        cursor = get_cursor(tu, 'test')
        self.assertEqual(cursor.availability, AvailabilityKind.DEPRECATED)

        # AvailabilityKind.NOT_ACCESSIBLE is only used in the code completion results

    def test_get_tokens(self):
        """Ensure we can map cursors back to tokens."""
        tu = get_tu('int foo(int i);')
        foo = get_cursor(tu, 'foo')

        tokens = list(foo.get_tokens())
        self.assertEqual(len(tokens), 6)
        self.assertEqual(tokens[0].spelling, 'int')
        self.assertEqual(tokens[1].spelling, 'foo')

    def test_get_token_cursor(self):
        """Ensure we can map tokens to cursors."""
        tu = get_tu('class A {}; int foo(A var = A());', lang='cpp')
        foo = get_cursor(tu, 'foo')

        for cursor in foo.walk_preorder():
            if cursor.kind.is_expression() and not cursor.kind.is_statement():
                break
        else:
            self.fail("Could not find default value expression")

        tokens = list(cursor.get_tokens())
        self.assertEqual(len(tokens), 4, [t.spelling for t in tokens])
        self.assertEqual(tokens[0].spelling, '=')
        self.assertEqual(tokens[1].spelling, 'A')
        self.assertEqual(tokens[2].spelling, '(')
        self.assertEqual(tokens[3].spelling, ')')
        t_cursor = tokens[1].cursor
        self.assertEqual(t_cursor.kind, CursorKind.TYPE_REF)
        r_cursor = t_cursor.referenced # should not raise an exception
        self.assertEqual(r_cursor.kind, CursorKind.CLASS_DECL)

    def test_get_arguments(self):
        tu = get_tu('void foo(int i, int j);')
        foo = get_cursor(tu, 'foo')
        arguments = list(foo.get_arguments())

        self.assertEqual(len(arguments), 2)
        self.assertEqual(arguments[0].spelling, "i")
        self.assertEqual(arguments[1].spelling, "j")

    def test_get_num_template_arguments(self):
        tu = get_tu(kTemplateArgTest, lang='cpp')
        foos = get_cursors(tu, 'foo')

        self.assertEqual(foos[1].get_num_template_arguments(), 3)

    def test_get_template_argument_kind(self):
        tu = get_tu(kTemplateArgTest, lang='cpp')
        foos = get_cursors(tu, 'foo')

        self.assertEqual(foos[1].get_template_argument_kind(0), TemplateArgumentKind.INTEGRAL)
        self.assertEqual(foos[1].get_template_argument_kind(1), TemplateArgumentKind.TYPE)
        self.assertEqual(foos[1].get_template_argument_kind(2), TemplateArgumentKind.INTEGRAL)

    def test_get_template_argument_type(self):
        tu = get_tu(kTemplateArgTest, lang='cpp')
        foos = get_cursors(tu, 'foo')

        self.assertEqual(foos[1].get_template_argument_type(1).kind, TypeKind.FLOAT)

    def test_get_template_argument_value(self):
        tu = get_tu(kTemplateArgTest, lang='cpp')
        foos = get_cursors(tu, 'foo')

        self.assertEqual(foos[1].get_template_argument_value(0), -7)
        self.assertEqual(foos[1].get_template_argument_value(2), True)

    def test_get_template_argument_unsigned_value(self):
        tu = get_tu(kTemplateArgTest, lang='cpp')
        foos = get_cursors(tu, 'foo')

        self.assertEqual(foos[1].get_template_argument_unsigned_value(0), 2 ** 32 - 7)
        self.assertEqual(foos[1].get_template_argument_unsigned_value(2), True)

    def test_referenced(self):
        tu = get_tu('void foo(); void bar() { foo(); }')
        foo = get_cursor(tu, 'foo')
        bar = get_cursor(tu, 'bar')
        for c in bar.get_children():
            if c.kind == CursorKind.CALL_EXPR:
                self.assertEqual(c.referenced.spelling, foo.spelling)
                break

    def test_mangled_name(self):
        kInputForMangling = """\
        int foo(int, int);
        """
        tu = get_tu(kInputForMangling, lang='cpp')
        foo = get_cursor(tu, 'foo')

        # Since libclang does not link in targets, we cannot pass a triple to it
        # and force the target. To enable this test to pass on all platforms, accept
        # all valid manglings.
        # [c-index-test handles this by running the source through clang, emitting
        #  an AST file and running libclang on that AST file]
        self.assertIn(foo.mangled_name, ('_Z3fooii', '__Z3fooii', '?foo@@YAHHH'))
