"""
Test lldb logging.  This test just makes sure logging doesn't crash, and produces some output.
"""

from __future__ import print_function



import os, time, string
import lldb
from lldbsuite.test.lldbtest import *

class LogTestCase(TestBase):

    mydir = TestBase.compute_mydir(__file__)
    append_log_file = "lldb-commands-log-append.txt"
    truncate_log_file = "lldb-commands-log-truncate.txt"

    @classmethod
    def classCleanup(cls):
        """Cleanup the test byproducts."""
        cls.RemoveTempFile(cls.truncate_log_file)
        cls.RemoveTempFile(cls.append_log_file)

    def test (self):
        self.build()
        if self.debug_info == "dsym":
            self.command_log_tests ("dsym")
        else:
            self.command_log_tests ("dwarf")

    def command_log_tests (self, type):
        exe = os.path.join (os.getcwd(), "a.out")
        self.expect("file " + exe,
                    patterns = [ "Current executable set to .*a.out" ])

        log_file = os.path.join (os.getcwd(), "lldb-commands-log-%s-%s-%s.txt" % (type,
                                                                                  os.path.basename(self.getCompiler()),
                                                                                  self.getArchitecture()))

        if (os.path.exists (log_file)):
            os.remove (log_file)

        # By default, Debugger::EnableLog() will set log options to
        # PREPEND_THREAD_NAME + OPTION_THREADSAFE. We don't want the
        # threadnames here, so we enable just threadsafe (-t).
        self.runCmd ("log enable -t -f '%s' lldb commands" % (log_file))
        
        self.runCmd ("command alias bp breakpoint")
                     
        self.runCmd ("bp set -n main")

        self.runCmd ("bp l")

        self.runCmd("log disable lldb")

        self.assertTrue (os.path.isfile (log_file))

        f = open (log_file)
        log_lines = f.readlines()
        f.close ()
        os.remove (log_file)

        self.assertGreater(len(log_lines), 0, "Something was written to the log file.")

    # Check that lldb truncates its log files
    @no_debug_info_test
    def test_log_truncate (self):
        if (os.path.exists (self.truncate_log_file)):
            os.remove (self.truncate_log_file)

        # put something in our log file
        with open(self.truncate_log_file, "w") as f:
            for i in range(1, 1000):
                f.write("bacon\n")

        self.runCmd ("log enable -t -f '%s' lldb commands" % (self.truncate_log_file))
        self.runCmd ("help log")
        self.runCmd ("log disable lldb")

        self.assertTrue (os.path.isfile (self.truncate_log_file))
        with open(self.truncate_log_file, "r") as f:
            contents = f.read ()

        # check that it got removed
        self.assertEquals(contents.find("bacon"), -1)

    # Check that lldb can append to a log file
    @no_debug_info_test
    def test_log_append (self):
        if (os.path.exists (self.append_log_file)):
            os.remove (self.append_log_file)

        # put something in our log file
        with open(self.append_log_file, "w") as f:
            f.write("bacon\n")

        self.runCmd ("log enable -t -a -f '%s' lldb commands" % (self.append_log_file))
        self.runCmd ("help log")
        self.runCmd ("log disable lldb")

        self.assertTrue (os.path.isfile (self.append_log_file))
        with open(self.append_log_file, "r") as f:
            contents = f.read ()

        # check that it is still there
        self.assertEquals(contents.find("bacon"), 0)