from _pydev_imps._pydev_thread import start_new_thread

try:
    from code import InteractiveConsole
except ImportError:
    from pydevconsole_code_for_ironpython import InteractiveConsole

from code import compile_command
from code import InteractiveInterpreter

import os
import sys

import _pydev_threading as threading

import traceback
import fix_getpass
fix_getpass.fixGetpass()

import pydevd_vars

from pydev_imports import Exec, _queue

try:
    import __builtin__
except:
    import builtins as __builtin__

try:
    False
    True
except NameError: # version < 2.3 -- didn't have the True/False builtins
    import __builtin__

    setattr(__builtin__, 'True', 1) #Python 3.0 does not accept __builtin__.True = 1 in its syntax
    setattr(__builtin__, 'False', 0)

from pydev_console_utils import BaseInterpreterInterface, BaseStdIn
from pydev_console_utils import CodeFragment

IS_PYTHON_3K = False
IS_PY24 = False

try:
    if sys.version_info[0] == 3:
        IS_PYTHON_3K = True
    elif sys.version_info[0] == 2 and sys.version_info[1] == 4:
        IS_PY24 = True
except:
    #That's OK, not all versions of python have sys.version_info
    pass


class Command:
    def __init__(self, interpreter, code_fragment):
        """
        :type code_fragment: CodeFragment
        :type interpreter: InteractiveConsole
        """
        self.interpreter = interpreter
        self.code_fragment = code_fragment
        self.more = None

    
    def symbol_for_fragment(code_fragment):
        if code_fragment.is_single_line:
            symbol = 'single'
        else:
            symbol = 'exec' # Jython doesn't support this
        return symbol
    symbol_for_fragment = staticmethod(symbol_for_fragment) 

    def run(self):
        text = self.code_fragment.text
        symbol = self.symbol_for_fragment(self.code_fragment)

        self.more = self.interpreter.runsource(text, '<input>', symbol)

try:
    try:
        execfile #Not in Py3k
    except NameError:
        from pydev_imports import execfile

        __builtin__.execfile = execfile
except:
    pass

# Pull in runfile, the interface to UMD that wraps execfile
from pydev_umd import runfile, _set_globals_function
try:
    import builtins
    builtins.runfile = runfile
except:
    import __builtin__
    __builtin__.runfile = runfile


#=======================================================================================================================
# InterpreterInterface
#=======================================================================================================================
class InterpreterInterface(BaseInterpreterInterface):
    '''
        The methods in this class should be registered in the xml-rpc server.
    '''

    def __init__(self, host, client_port, mainThread, show_banner=True):
        BaseInterpreterInterface.__init__(self, mainThread)
        self.client_port = client_port
        self.host = host
        self.namespace = {}
        self.interpreter = InteractiveConsole(self.namespace)
        self._input_error_printed = False


    def doAddExec(self, codeFragment):
        command = Command(self.interpreter, codeFragment)
        command.run()
        return command.more


    def getNamespace(self):
        return self.namespace


    def getCompletions(self, text, act_tok):
        try:
            from _pydev_completer import Completer

            completer = Completer(self.namespace, None)
            return completer.complete(act_tok)
        except:
            import traceback

            traceback.print_exc()
            return []

    def close(self):
        sys.exit(0)

    def get_greeting_msg(self):
        return 'PyDev console: starting.\n'


class _ProcessExecQueueHelper:
    _debug_hook = None
    _return_control_osc = False

def set_debug_hook(debug_hook):
    _ProcessExecQueueHelper._debug_hook = debug_hook


def process_exec_queue(interpreter):

    from pydev_ipython.inputhook import get_inputhook, set_return_control_callback

    def return_control():
        ''' A function that the inputhooks can call (via inputhook.stdin_ready()) to find
            out if they should cede control and return '''
        if _ProcessExecQueueHelper._debug_hook:
            # Some of the input hooks check return control without doing
            # a single operation, so we don't return True on every
            # call when the debug hook is in place to allow the GUI to run
            # XXX: Eventually the inputhook code will have diverged enough
            # from the IPython source that it will be worthwhile rewriting
            # it rather than pretending to maintain the old API
            _ProcessExecQueueHelper._return_control_osc = not _ProcessExecQueueHelper._return_control_osc
            if _ProcessExecQueueHelper._return_control_osc:
                return True

        if not interpreter.exec_queue.empty():
            return True
        return False

    set_return_control_callback(return_control)

    from pydev_import_hook import import_hook_manager
    from pydev_ipython.matplotlibtools import activate_matplotlib, activate_pylab, activate_pyplot
    import_hook_manager.add_module_name("matplotlib", lambda: activate_matplotlib(interpreter.enableGui))
    # enable_gui_function in activate_matplotlib should be called in main thread. That's why we call
    # interpreter.enableGui which put it into the interpreter's exec_queue and executes it in the main thread.
    import_hook_manager.add_module_name("pylab", activate_pylab)
    import_hook_manager.add_module_name("pyplot", activate_pyplot)

    while 1:
        # Running the request may have changed the inputhook in use
        inputhook = get_inputhook()

        if _ProcessExecQueueHelper._debug_hook:
            _ProcessExecQueueHelper._debug_hook()

        if inputhook:
            try:
                # Note: it'll block here until return_control returns True.
                inputhook()
            except:
                import traceback;traceback.print_exc()
        try:
            try:
                code_fragment = interpreter.exec_queue.get(block=True, timeout=1/20.) # 20 calls/second
            except _queue.Empty:
                continue

            if callable(code_fragment):
                # It can be a callable (i.e.: something that must run in the main
                # thread can be put in the queue for later execution).
                code_fragment()
            else:
                more = interpreter.addExec(code_fragment)
        except KeyboardInterrupt:
            interpreter.buffer = None
            continue
        except SystemExit:
            raise
        except:
            type, value, tb = sys.exc_info()
            traceback.print_exception(type, value, tb, file=sys.__stderr__)
            exit()


if 'IPYTHONENABLE' in os.environ:
    IPYTHON = os.environ['IPYTHONENABLE'] == 'True'
else:
    IPYTHON = True

try:
    try:
        exitfunc = sys.exitfunc
    except AttributeError:
        exitfunc = None

    if IPYTHON:
        from pydev_ipython_console import InterpreterInterface
        if exitfunc is not None:
            sys.exitfunc = exitfunc
        else:
            try:
                delattr(sys, 'exitfunc')
            except:
                pass
except:
    IPYTHON = False
    pass

#=======================================================================================================================
# _DoExit
#=======================================================================================================================
def DoExit(*args):
    '''
        We have to override the exit because calling sys.exit will only actually exit the main thread,
        and as we're in a Xml-rpc server, that won't work.
    '''

    try:
        import java.lang.System

        java.lang.System.exit(1)
    except ImportError:
        if len(args) == 1:
            os._exit(args[0])
        else:
            os._exit(0)


def handshake():
    return "PyCharm"


#=======================================================================================================================
# StartServer
#=======================================================================================================================
def start_server(host, port, interpreter):
    if port == 0:
        host = ''

    #I.e.: supporting the internal Jython version in PyDev to create a Jython interactive console inside Eclipse.
    from pydev_imports import SimpleXMLRPCServer as XMLRPCServer  #@Reimport

    try:
        if IS_PY24:
            server = XMLRPCServer((host, port), logRequests=False)
        else:
            server = XMLRPCServer((host, port), logRequests=False, allow_none=True)

    except:
        sys.stderr.write('Error starting server with host: %s, port: %s, client_port: %s\n' % (host, port, interpreter.client_port))
        raise

    # Tell UMD the proper default namespace
    _set_globals_function(interpreter.getNamespace)

    server.register_function(interpreter.execLine)
    server.register_function(interpreter.execMultipleLines)
    server.register_function(interpreter.getCompletions)
    server.register_function(interpreter.getFrame)
    server.register_function(interpreter.getVariable)
    server.register_function(interpreter.changeVariable)
    server.register_function(interpreter.getDescription)
    server.register_function(interpreter.close)
    server.register_function(interpreter.interrupt)
    server.register_function(handshake)
    server.register_function(interpreter.connectToDebugger)
    server.register_function(interpreter.hello)
    server.register_function(interpreter.getArray)
    server.register_function(interpreter.evaluate)

    # Functions for GUI main loop integration
    server.register_function(interpreter.enableGui)

    if port == 0:
        (h, port) = server.socket.getsockname()

        print(port)
        print(interpreter.client_port)


    sys.stderr.write(interpreter.get_greeting_msg())
    sys.stderr.flush()

    while True:
        try:
            server.serve_forever()
        except:
            # Ugly code to be py2/3 compatible
            # https://sw-brainwy.rhcloud.com/tracker/PyDev/534:
            # Unhandled "interrupted system call" error in the pydevconsol.py
            e = sys.exc_info()[1]
            retry = False
            try:
                retry = e.args[0] == 4 #errno.EINTR
            except:
                pass
            if not retry:
                raise
            # Otherwise, keep on going
    return server


def StartServer(host, port, client_port):
    #replace exit (see comments on method)
    #note that this does not work in jython!!! (sys method can't be replaced).
    sys.exit = DoExit

    interpreter = InterpreterInterface(host, client_port, threading.currentThread())

    start_new_thread(start_server,(host, port, interpreter))

    process_exec_queue(interpreter)


def get_interpreter():
    try:
        interpreterInterface = getattr(__builtin__, 'interpreter')
    except AttributeError:
        interpreterInterface = InterpreterInterface(None, None, threading.currentThread())
        setattr(__builtin__, 'interpreter', interpreterInterface)

    return interpreterInterface


def get_completions(text, token, globals, locals):
    interpreterInterface = get_interpreter()

    interpreterInterface.interpreter.update(globals, locals)

    return interpreterInterface.getCompletions(text, token)

#===============================================================================
# Debugger integration
#===============================================================================

def exec_code(code, globals, locals):
    interpreterInterface = get_interpreter()
    interpreterInterface.interpreter.update(globals, locals)

    res = interpreterInterface.needMore(code)

    if res:
        return True

    interpreterInterface.addExec(code)

    return False



class ConsoleWriter(InteractiveInterpreter):
    skip = 0

    def __init__(self, locals=None):
        InteractiveInterpreter.__init__(self, locals)

    def write(self, data):
        #if (data.find("global_vars") == -1 and data.find("pydevd") == -1):
        if self.skip > 0:
            self.skip -= 1
        else:
            if data == "Traceback (most recent call last):\n":
                self.skip = 1
            sys.stderr.write(data)

    def showsyntaxerror(self, filename=None):
        """Display the syntax error that just occurred."""
        #Override for avoid using sys.excepthook PY-12600
        type, value, tb = sys.exc_info()
        sys.last_type = type
        sys.last_value = value
        sys.last_traceback = tb
        if filename and type is SyntaxError:
            # Work hard to stuff the correct filename in the exception
            try:
                msg, (dummy_filename, lineno, offset, line) = value.args
            except ValueError:
                # Not the format we expect; leave it alone
                pass
            else:
                # Stuff in the right filename
                value = SyntaxError(msg, (filename, lineno, offset, line))
                sys.last_value = value
        list = traceback.format_exception_only(type, value)
        sys.stderr.write(''.join(list))

    def showtraceback(self):
        """Display the exception that just occurred."""
        #Override for avoid using sys.excepthook PY-12600
        try:
            type, value, tb = sys.exc_info()
            sys.last_type = type
            sys.last_value = value
            sys.last_traceback = tb
            tblist = traceback.extract_tb(tb)
            del tblist[:1]
            lines = traceback.format_list(tblist)
            if lines:
                lines.insert(0, "Traceback (most recent call last):\n")
            lines.extend(traceback.format_exception_only(type, value))
        finally:
            tblist = tb = None
        sys.stderr.write(''.join(lines))

def consoleExec(thread_id, frame_id, expression):
    """returns 'False' in case expression is partially correct
    """
    frame = pydevd_vars.findFrame(thread_id, frame_id)

    expression = str(expression.replace('@LINE@', '\n'))

    #Not using frame.f_globals because of https://sourceforge.net/tracker2/?func=detail&aid=2541355&group_id=85796&atid=577329
    #(Names not resolved in generator expression in method)
    #See message: http://mail.python.org/pipermail/python-list/2009-January/526522.html
    updated_globals = {}
    updated_globals.update(frame.f_globals)
    updated_globals.update(frame.f_locals) #locals later because it has precedence over the actual globals

    if IPYTHON:
        return exec_code(CodeFragment(expression), updated_globals, frame.f_locals)

    interpreter = ConsoleWriter()

    try:
        code = compile_command(expression)
    except (OverflowError, SyntaxError, ValueError):
        # Case 1
        interpreter.showsyntaxerror()
        return False

    if code is None:
        # Case 2
        return True

    #Case 3

    try:
        Exec(code, updated_globals, frame.f_locals)

    except SystemExit:
        raise
    except:
        interpreter.showtraceback()

    return False

#=======================================================================================================================
# main
#=======================================================================================================================
if __name__ == '__main__':
    #Important: don't use this module directly as the __main__ module, rather, import itself as pydevconsole
    #so that we don't get multiple pydevconsole modules if it's executed directly (otherwise we'd have multiple
    #representations of its classes).
    #See: https://sw-brainwy.rhcloud.com/tracker/PyDev/446: 
    #'Variables' and 'Expressions' views stopped working when debugging interactive console
    import pydevconsole
    sys.stdin = pydevconsole.BaseStdIn()
    port, client_port = sys.argv[1:3]
    import pydev_localhost

    if int(port) == 0 and int(client_port) == 0:
        (h, p) = pydev_localhost.get_socket_name()

        client_port = p

    pydevconsole.StartServer(pydev_localhost.get_localhost(), int(port), int(client_port))
