"""
Use lldb Python API to verify that expression evaluation for property references uses the correct getters and setters
"""

from __future__ import print_function



import os, time
import re
import lldb
import lldbsuite.test.lldbutil as lldbutil
from lldbsuite.test.lldbtest import *

class ObjCPropertyTestCase(TestBase):

    mydir = TestBase.compute_mydir(__file__)

    def setUp(self):
        # Call super's setUp().                                                                                                           
        TestBase.setUp(self)

        # Find the line number to break for main.c.                                                                                       
        self.source_name = 'main.m'

    @skipUnlessDarwin
    @add_test_categories(['pyapi'])
    def test_objc_properties(self):
        """Test that expr uses the correct property getters and setters"""
        if self.getArchitecture() == 'i386':
            self.skipTest("requires modern objc runtime")

        self.build()
        exe = os.path.join(os.getcwd(), "a.out")

        # Create a target from the debugger.

        target = self.dbg.CreateTarget (exe)
        self.assertTrue(target, VALID_TARGET)

        # Set up our breakpoints:
        
        main_bkpt = target.BreakpointCreateBySourceRegex ("Set a breakpoint here.", lldb.SBFileSpec (self.source_name))
        self.assertTrue(main_bkpt and
                        main_bkpt.GetNumLocations() == 1,
                        VALID_BREAKPOINT)

        # Now launch the process, and do not stop at the entry point.
        process = target.LaunchSimple (None, None, self.get_process_working_directory())

        self.assertTrue(process.GetState() == lldb.eStateStopped,
                        PROCESS_STOPPED)

        threads = lldbutil.get_threads_stopped_at_breakpoint (process, main_bkpt)
        self.assertTrue (len(threads) == 1)
        thread = threads[0]
        frame = thread.GetFrameAtIndex(0)

        mine = frame.FindVariable ("mine")
        self.assertTrue (mine.IsValid())
        access_count = mine.GetChildMemberWithName ("_access_count")
        self.assertTrue (access_count.IsValid())
        start_access_count = access_count.GetValueAsUnsigned (123456)
        self.assertTrue (start_access_count != 123456)

        #
        # The first set of tests test calling the getter & setter of
        # a property that actually only has a getter & setter and no
        # @property.
        #
        nonexistant_value = frame.EvaluateExpression("mine.nonexistantInt", False)
        nonexistant_error = nonexistant_value.GetError()
        self.assertTrue (nonexistant_error.Success())
        nonexistant_int = nonexistant_value.GetValueAsUnsigned (123456)
        self.assertTrue (nonexistant_int == 6)
        
        # Calling the getter function would up the access count, so make sure that happened.
        
        new_access_count = access_count.GetValueAsUnsigned (123456)
        self.assertTrue (new_access_count - start_access_count == 1)
        start_access_count = new_access_count

        #
        # Now call the setter, then make sure that
        nonexistant_change = frame.EvaluateExpression("mine.nonexistantInt = 10", False)
        nonexistant_error = nonexistant_change.GetError()
        self.assertTrue (nonexistant_error.Success())

        # Calling the setter function would up the access count, so make sure that happened.
        
        new_access_count = access_count.GetValueAsUnsigned (123456)
        self.assertTrue (new_access_count - start_access_count == 1)
        start_access_count = new_access_count

        #
        # Now we call the getter of a property that is backed by an ivar,
        # make sure it works and that we actually update the backing ivar.
        #

        backed_value = frame.EvaluateExpression("mine.backedInt", False)
        backed_error = backed_value.GetError()
        self.assertTrue (backed_error.Success())
        backing_value = mine.GetChildMemberWithName ("_backedInt")
        self.assertTrue (backing_value.IsValid())
        self.assertTrue (backed_value.GetValueAsUnsigned (12345) == backing_value.GetValueAsUnsigned(23456))

        unbacked_value = frame.EvaluateExpression("mine.unbackedInt", False)
        unbacked_error = unbacked_value.GetError()
        self.assertTrue (unbacked_error.Success())

        idWithProtocol_value = frame.EvaluateExpression("mine.idWithProtocol", False)
        idWithProtocol_error = idWithProtocol_value.GetError()
        self.assertTrue (idWithProtocol_error.Success())
        self.assertTrue (idWithProtocol_value.GetTypeName() == "id")
