# Python Tools for Visual Studio
# Copyright(c) Microsoft Corporation
# All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the License); you may not use
# this file except in compliance with the License. You may obtain a copy of the
# License at http://www.apache.org/licenses/LICENSE-2.0
#
# THIS CODE IS PROVIDED ON AN  *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS
# OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY
# IMPLIED WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
# MERCHANTABLITY OR NON-INFRINGEMENT.
#
# See the Apache Version 2.0 License for specific language governing
# permissions and limitations under the License.

__author__ = "Microsoft Corporation <ptvshelp@microsoft.com>"
__version__ = "3.0.0.0"

import os
import sys
import json
import unittest
import socket
import traceback
from types import CodeType, FunctionType
import signal
try:
    import thread
except:
    import _thread as thread

class _TestOutput(object):
    """file like object which redirects output to the repl window."""
    errors = 'strict'

    def __init__(self, old_out, is_stdout):
        self.is_stdout = is_stdout
        self.old_out = old_out
        if sys.version >= '3.' and hasattr(old_out, 'buffer'):
            self.buffer = _TestOutputBuffer(old_out.buffer, is_stdout)

    def flush(self):
        if self.old_out:
            self.old_out.flush()

    def writelines(self, lines):
        for line in lines:
            self.write(line)

    @property
    def encoding(self):
        return 'utf8'

    def write(self, value):
        _channel.send_event('stdout' if self.is_stdout else 'stderr', content=value)
        if self.old_out:
            self.old_out.write(value)
            # flush immediately, else things go wonky and out of order
            self.flush()

    def isatty(self):
        return True

    def next(self):
        pass

    @property
    def name(self):
        if self.is_stdout:
            return "<stdout>"
        else:
            return "<stderr>"

    def __getattr__(self, name):
        return getattr(self.old_out, name)

class _TestOutputBuffer(object):
    def __init__(self, old_buffer, is_stdout):
        self.buffer = old_buffer
        self.is_stdout = is_stdout

    def write(self, data):
        _channel.send_event('stdout' if self.is_stdout else 'stderr', content=data)
        self.buffer.write(data)

    def flush(self):
        self.buffer.flush()

    def truncate(self, pos = None):
        return self.buffer.truncate(pos)

    def tell(self):
        return self.buffer.tell()

    def seek(self, pos, whence = 0):
        return self.buffer.seek(pos, whence)

class _IpcChannel(object):
    def __init__(self, socket, callback):
        self.socket = socket
        self.seq = 0
        self.callback = callback
        self.lock = thread.allocate_lock()
        self._closed = False
        # start the testing reader thread loop
        self.test_thread_id = thread.start_new_thread(self.readSocket, ())

    def close(self):
        self._closed = True

    def readSocket(self):
        try:
            data = self.socket.recv(1024)
            self.callback()
        except OSError:
            if not self._closed:
                raise

    def receive(self):
        pass

    def send_event(self, name, **args):
        with self.lock:
            body = {'type': 'event', 'seq': self.seq, 'event':name, 'body':args}
            self.seq += 1
            content = json.dumps(body).encode('utf8')
            headers = ('Content-Length: %d\n\n' % (len(content), )).encode('utf8')
            self.socket.send(headers)
            self.socket.send(content)

_channel = None


class VsTestResult(unittest.TextTestResult):
    def startTest(self, test):
        super(VsTestResult, self).startTest(test)
        if _channel is not None:
            _channel.send_event(
                name='start',
                test = test.id()
            )

    def addError(self, test, err):
        super(VsTestResult, self).addError(test, err)
        self.sendResult(test, 'error', err)

    def addFailure(self, test, err):
        super(VsTestResult, self).addFailure(test, err)
        self.sendResult(test, 'failed', err)

    def addSuccess(self, test):
        super(VsTestResult, self).addSuccess(test)
        self.sendResult(test, 'passed')

    def addSkip(self, test, reason):
        super(VsTestResult, self).addSkip(test, reason)
        self.sendResult(test, 'skipped')

    def addExpectedFailure(self, test, err):
        super(VsTestResult, self).addExpectedFailure(test, err)
        self.sendResult(test, 'failed', err)

    def addUnexpectedSuccess(self, test):
        super(VsTestResult, self).addUnexpectedSuccess(test)
        self.sendResult(test, 'passed')

    def sendResult(self, test, outcome, trace = None):
        if _channel is not None:
            tb = None
            message = None
            if trace is not None:
                traceback.print_exc()
                formatted = traceback.format_exception(*trace)
                # Remove the 'Traceback (most recent call last)'
                formatted = formatted[1:]
                tb = ''.join(formatted)
                message = str(trace[1])
            _channel.send_event(
                name='result',
                outcome=outcome,
                traceback = tb,
                message = message,
                test = test.id()
            )

def stopTests():
    try:
        os.kill(os.getpid(), signal.SIGUSR1)
    except:
        try:
            os.kill(os.getpid(), signal.SIGTERM)
        except:
            pass

class ExitCommand(Exception):
    pass

def signal_handler(signal, frame):
    raise ExitCommand()

def main():
    import os
    import sys
    import unittest
    from optparse import OptionParser
    global _channel

    parser = OptionParser(prog = 'visualstudio_py_testlauncher', usage = 'Usage: %prog [<option>] <test names>... ')
    parser.add_option('--debug', action='store_true', help='Whether debugging the unit tests')
    parser.add_option('-x', '--mixed-mode', action='store_true', help='wait for mixed-mode debugger to attach')
    parser.add_option('-t', '--test', type='str', dest='tests', action='append', help='specifies a test to run')
    parser.add_option('--testFile', type='str', help='Fully qualitified path to file name')
    parser.add_option('-c', '--coverage', type='str', help='enable code coverage and specify filename')
    parser.add_option('-r', '--result-port', type='int', help='connect to port on localhost and send test results')
    parser.add_option('--us', type='str', help='Directory to start discovery')
    parser.add_option('--up', type='str', help='Pattern to match test files (''test*.py'' default)')
    parser.add_option('--ut', type='str', help='Top level directory of project (default to start directory)')
    parser.add_option('--uvInt', '--verboseInt', type='int', help='Verbose output (0 none, 1 (no -v) simple, 2 (-v) full)')
    parser.add_option('--uf', '--failfast', type='str', help='Stop on first failure')
    parser.add_option('--uc', '--catch', type='str', help='Catch control-C and display results')
    (opts, _) = parser.parse_args()

    if opts.debug:
        from ptvsd.visualstudio_py_debugger import DONT_DEBUG, DEBUG_ENTRYPOINTS, get_code

    sys.path[0] = os.getcwd()
    if opts.result_port:
        try:
            signal.signal(signal.SIGUSR1, signal_handler)
        except:
            try:
                signal.signal(signal.SIGTERM, signal_handler)
            except:
                pass
        _channel = _IpcChannel(socket.create_connection(('127.0.0.1', opts.result_port)), stopTests)
        sys.stdout = _TestOutput(sys.stdout, is_stdout = True)
        sys.stderr = _TestOutput(sys.stderr, is_stdout = False)

    if opts.debug:
        DONT_DEBUG.append(os.path.normcase(__file__))
        DEBUG_ENTRYPOINTS.add(get_code(main))

        pass
    elif opts.mixed_mode:
        # For mixed-mode attach, there's no ptvsd and hence no wait_for_attach(),
        # so we have to use Win32 API in a loop to do the same thing.
        from time import sleep
        from ctypes import windll, c_char
        while True:
            if windll.kernel32.IsDebuggerPresent() != 0:
                break
            sleep(0.1)
        try:
            debugger_helper = windll['Microsoft.PythonTools.Debugger.Helper.x86.dll']
        except WindowsError:
            debugger_helper = windll['Microsoft.PythonTools.Debugger.Helper.x64.dll']
        isTracing = c_char.in_dll(debugger_helper, "isTracing")
        while True:
            if isTracing.value != 0:
                break
            sleep(0.1)

    cov = None
    try:
        if opts.coverage:
            try:
                import coverage
                cov = coverage.coverage(opts.coverage)
                cov.load()
                cov.start()
            except:
                pass
        if opts.tests is None and opts.testFile is None:
            if opts.us is None:
                opts.us = '.'
            if opts.up is None:
                opts.up = 'test*.py'
            tests = unittest.defaultTestLoader.discover(opts.us, opts.up)
        else:
            # loadTestsFromNames doesn't work well (with duplicate file names or class names)
            # Easier approach is find the test suite and use that for running
            loader = unittest.TestLoader()
            # opts.us will be passed in
            suites = loader.discover(opts.us, pattern=os.path.basename(opts.testFile))
            suite = None
            tests = None
            if opts.tests is None:
                # Run everything in the test file
                tests = suites
            else:
                # Run a specific test class or test method
                for test_suite in suites._tests:
                    for cls in test_suite._tests:
                        try:
                            for m in cls._tests:
                                testId = m.id()
                                if testId.startswith(opts.tests[0]):
                                    suite = cls
                                if testId == opts.tests[0]:
                                    tests = unittest.TestSuite([m])
                                    break
                        except Exception as err:
                            errorMessage = traceback.format_exception()
                            pass
                if tests is None:
                    tests = suite
            if tests is None and suite is None:
                _channel.send_event(
                    name='error',
                    outcome='',
                    traceback = '',
                    message = 'Failed to identify the test',
                    test = ''
                )
        if opts.uvInt is None:
            opts.uvInt = 0
        if opts.uf is not None:
            runner = unittest.TextTestRunner(verbosity=opts.uvInt, resultclass=VsTestResult, failfast=True)
        else:
            runner = unittest.TextTestRunner(verbosity=opts.uvInt, resultclass=VsTestResult)
        result = runner.run(tests)
        if _channel is not None:
            _channel.close()
        sys.exit(not result.wasSuccessful())
    finally:
        if cov is not None:
            cov.stop()
            cov.save()
            cov.xml_report(outfile = opts.coverage + '.xml', omit=__file__)
        if _channel is not None:
            _channel.send_event(
                name='done'
            )
            _channel.socket.close()
        # prevent generation of the error 'Error in sys.exitfunc:'
        try:
            sys.stdout.close()
        except:
            pass
        try:
            sys.stderr.close()
        except:
            pass

if __name__ == '__main__':
    main()