"""
Test that an alias can reference other aliases without crashing.
"""


import lldb
from lldbsuite.test.decorators import skipIfWasm
from lldbsuite.test.lldbtest import *
import lldbsuite.test.lldbutil as lldbutil


class NestedAliasTestCase(TestBase):
    NO_DEBUG_INFO_TESTCASE = True

    def setUp(self):
        # Call super's setUp().
        TestBase.setUp(self)
        # Find the line number to break inside main().
        self.line = line_number("main.cpp", "// break here")

    @skipIfWasm  # the test reads memory at the address an expression computes
    def test_nested_alias(self):
        """Test that an alias can reference other aliases without crashing."""
        self.build()
        exe = self.getBuildArtifact("a.out")
        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)

        # Break in main() after the variables are assigned values.
        lldbutil.run_break_set_by_file_and_line(
            self, "main.cpp", self.line, num_expected_locations=1, loc_exact=True
        )

        self.runCmd("run", RUN_SUCCEEDED)

        # The stop reason of the thread should be breakpoint.
        self.expect(
            "thread list",
            STOPPED_DUE_TO_BREAKPOINT,
            substrs=["stopped", "stop reason = breakpoint"],
        )

        # The breakpoint should have a hit count of 1.
        lldbutil.check_breakpoint(self, bpno=1, expected_hit_count=1)

        # This is the function to remove the custom aliases in order to have a
        # clean slate for the next test case.
        def cleanup():
            self.runCmd("command unalias read", check=False)
            self.runCmd("command unalias rd", check=False)
            self.runCmd("command unalias fo", check=False)
            self.runCmd("command unalias foself", check=False)
            self.runCmd("command unalias add_two", check=False)
            self.runCmd("command unalias two", check=False)

        # Execute the cleanup function during test case tear down.
        self.addTearDownHook(cleanup)

        self.runCmd("command alias read memory read -f A")
        self.runCmd("command alias rd read -c 3")

        self.expect(
            "memory read -f A -c 3 `&my_ptr[0]`",
            substrs=["deadbeef", "main.cpp:", "feedbeef"],
        )
        self.expect("rd `&my_ptr[0]`", substrs=["deadbeef", "main.cpp:", "feedbeef"])

        self.expect(
            "memory read -f A -c 3 `&my_ptr[0]`", substrs=["deadfeed"], matching=False
        )
        self.expect("rd `&my_ptr[0]`", substrs=["deadfeed"], matching=False)

        self.runCmd("command alias fo frame variable -O --")
        self.runCmd("command alias foself fo self")

        self.expect(
            "help foself",
            substrs=["--show-all-children", "--raw-output"],
            matching=False,
        )
        self.expect(
            "help foself",
            substrs=["Show variables for the current", "stack frame."],
            matching=True,
        )

        # Check that foself was resolved and is now independent of 'fo'.
        self.runCmd("command unalias fo")
        self.expect(
            "help foself",
            substrs=["Show variables for the current", "stack frame."],
            matching=True,
        )

        # Check that aliases can be created for raw input commands.
        self.expect("command alias two expr -- 2")
        self.expect("command alias add_two two +")
        self.expect("add_two 3", patterns=[" = 5$"])
        # Check that aliases to aliases to raw input commands work the second
        # and subsequent times.
        self.expect("add_two 3", patterns=[" = 5$"])
        self.expect("add_two 3", patterns=[" = 5$"])