from __future__ import absolute_import, print_function, unicode_literals
import argparse
import collections
import contextlib
import logging
import os
import signal
import sys
import pykka
from mopidy import config as config_lib, exceptions
from mopidy.audio import Audio
from mopidy.core import Core
from mopidy.internal import deps, process, timer, versioning
from mopidy.internal.gi import GLib
logger = logging.getLogger(__name__)
_default_config = []
for base in GLib.get_system_config_dirs() + [GLib.get_user_config_dir()]:
    _default_config.append(os.path.join(base, b'mopidy', b'mopidy.conf'))
DEFAULT_CONFIG = b':'.join(_default_config)
def config_files_type(value):
    return value.split(b':')
def config_override_type(value):
    try:
        section, remainder = value.split(b'/', 1)
        key, value = remainder.split(b'=', 1)
        return (section.strip(), key.strip(), value.strip())
    except ValueError:
        raise argparse.ArgumentTypeError(
            '%s must have the format section/key=value' % value)
class _ParserError(Exception):
    def __init__(self, message):
        self.message = message
class _HelpError(Exception):
    pass
class _ArgumentParser(argparse.ArgumentParser):
    def error(self, message):
        raise _ParserError(message)
class _HelpAction(argparse.Action):
    def __init__(self, option_strings, dest=None, help=None):
        super(_HelpAction, self).__init__(
            option_strings=option_strings,
            dest=dest or argparse.SUPPRESS,
            default=argparse.SUPPRESS,
            nargs=0,
            help=help)
    def __call__(self, parser, namespace, values, option_string=None):
        raise _HelpError()
[docs]class Command(object):
    """Command parser and runner for building trees of commands.
    This class provides a wraper around :class:`argparse.ArgumentParser`
    for handling this type of command line application in a better way than
    argprases own sub-parser handling.
    """
    help = None
    #: Help text to display in help output.
    def __init__(self):
        self._children = collections.OrderedDict()
        self._arguments = []
        self._overrides = {}
    def _build(self):
        actions = []
        parser = _ArgumentParser(add_help=False)
        parser.register('action', 'help', _HelpAction)
        for args, kwargs in self._arguments:
            actions.append(parser.add_argument(*args, **kwargs))
        parser.add_argument('_args', nargs=argparse.REMAINDER,
                            help=argparse.SUPPRESS)
        return parser, actions
[docs]    def add_child(self, name, command):
        """Add a child parser to consider using.
        :param name: name to use for the sub-command that is being added.
        :type name: string
        """
        self._children[name] = command 
[docs]    def add_argument(self, *args, **kwargs):
        """Add an argument to the parser.
        This method takes all the same arguments as the
        :class:`argparse.ArgumentParser` version of this method.
        """
        self._arguments.append((args, kwargs)) 
[docs]    def set(self, **kwargs):
        """Override a value in the finaly result of parsing."""
        self._overrides.update(kwargs) 
[docs]    def exit(self, status_code=0, message=None, usage=None):
        """Optionally print a message and exit."""
        print('\n\n'.join(m for m in (usage, message) if m))
        sys.exit(status_code) 
    def _usage(self, actions, prog):
        formatter = argparse.HelpFormatter(prog)
        formatter.add_usage(None, actions, [])
        return formatter.format_help().strip()
    def _subhelp(self, name, result):
        actions = self._build()[1]
        if self.help or actions:
            formatter = argparse.HelpFormatter(name)
            formatter.add_usage(None, actions, [], '')
            formatter.start_section(None)
            formatter.add_text(self.help)
            formatter.start_section(None)
            formatter.add_arguments(actions)
            formatter.end_section()
            formatter.end_section()
            result.append(formatter.format_help())
        for childname, child in self._children.items():
            child._subhelp(' '.join((name, childname)), result)
[docs]    def parse(self, args, prog=None):
        """Parse command line arguments.
        Will recursively parse commands until a final parser is found or an
        error occurs. In the case of errors we will print a message and exit.
        Otherwise, any overrides are applied and the current parser stored
        in the command attribute of the return value.
        :param args: list of arguments to parse
        :type args: list of strings
        :param prog: name to use for program
        :type prog: string
        :rtype: :class:`argparse.Namespace`
        """
        prog = prog or os.path.basename(sys.argv[0])
        try:
            return self._parse(
                args, argparse.Namespace(), self._overrides.copy(), prog)
        except _HelpError:
            self.exit(0, self.format_help(prog)) 
    def _parse(self, args, namespace, overrides, prog):
        overrides.update(self._overrides)
        parser, actions = self._build()
        try:
            result = parser.parse_args(args, namespace)
        except _ParserError as e:
            self.exit(1, e.message, self._usage(actions, prog))
        if not result._args:
            for attr, value in overrides.items():
                setattr(result, attr, value)
            delattr(result, '_args')
            result.command = self
            return result
        child = result._args.pop(0)
        if child not in self._children:
            usage = self._usage(actions, prog)
            self.exit(1, 'unrecognized command: %s' % child, usage)
        return self._children[child]._parse(
            result._args, result, overrides, ' '.join([prog, child]))
[docs]    def run(self, *args, **kwargs):
        """Run the command.
        Must be implemented by sub-classes that are not simply an intermediate
        in the command namespace.
        """
        raise NotImplementedError  
@contextlib.contextmanager
def _actor_error_handling(name):
    try:
        yield
    except exceptions.BackendError as exc:
        logger.error(
            'Backend (%s) initialization error: %s', name, exc.message)
    except exceptions.FrontendError as exc:
        logger.error(
            'Frontend (%s) initialization error: %s', name, exc.message)
    except exceptions.MixerError as exc:
        logger.error(
            'Mixer (%s) initialization error: %s', name, exc.message)
    except Exception:
        logger.exception('Got un-handled exception from %s', name)
# TODO: move out of this utility class
class RootCommand(Command):
    def __init__(self):
        super(RootCommand, self).__init__()
        self.set(base_verbosity_level=0)
        self.add_argument(
            '-h', '--help',
            action='help', help='Show this message and exit')
        self.add_argument(
            '--version', action='version',
            version='Mopidy %s' % versioning.get_version())
        self.add_argument(
            '-q', '--quiet',
            action='store_const', const=-1, dest='verbosity_level',
            help='less output (warning level)')
        self.add_argument(
            '-v', '--verbose',
            action='count', dest='verbosity_level', default=0,
            help='more output (repeat up to 3 times for even more)')
        self.add_argument(
            '--save-debug-log',
            action='store_true', dest='save_debug_log',
            help='save debug log to "./mopidy.log"')
        self.add_argument(
            '--config',
            action='store', dest='config_files', type=config_files_type,
            default=DEFAULT_CONFIG, metavar='FILES',
            help='config files to use, colon seperated, later files override')
        self.add_argument(
            '-o', '--option',
            action='append', dest='config_overrides',
            type=config_override_type, metavar='OPTIONS',
            help='`section/key=value` values to override config options')
    def run(self, args, config):
        def on_sigterm(loop):
            logger.info('GLib mainloop got SIGTERM. Exiting...')
            loop.quit()
        loop = GLib.MainLoop()
        GLib.unix_signal_add(
            GLib.PRIORITY_DEFAULT, signal.SIGTERM, on_sigterm, loop)
        mixer_class = self.get_mixer_class(config, args.registry['mixer'])
        backend_classes = args.registry['backend']
        frontend_classes = args.registry['frontend']
        core = None
        exit_status_code = 0
        try:
            mixer = None
            if mixer_class is not None:
                mixer = self.start_mixer(config, mixer_class)
            if mixer:
                self.configure_mixer(config, mixer)
            audio = self.start_audio(config, mixer)
            backends = self.start_backends(config, backend_classes, audio)
            core = self.start_core(config, mixer, backends, audio)
            self.start_frontends(config, frontend_classes, core)
            logger.info('Starting GLib mainloop')
            loop.run()
        except (exceptions.BackendError,
                exceptions.FrontendError,
                exceptions.MixerError):
            logger.info('Initialization error. Exiting...')
            exit_status_code = 1
        except KeyboardInterrupt:
            logger.info('Interrupted. Exiting...')
        except Exception:
            logger.exception('Uncaught exception')
        finally:
            loop.quit()
            self.stop_frontends(frontend_classes)
            self.stop_core(core)
            self.stop_backends(backend_classes)
            self.stop_audio()
            if mixer_class is not None:
                self.stop_mixer(mixer_class)
            process.stop_remaining_actors()
            return exit_status_code
    def get_mixer_class(self, config, mixer_classes):
        logger.debug(
            'Available Mopidy mixers: %s',
            ', '.join(m.__name__ for m in mixer_classes) or 'none')
        if config['audio']['mixer'] == 'none':
            logger.debug('Mixer disabled')
            return None
        selected_mixers = [
            m for m in mixer_classes if m.name == config['audio']['mixer']]
        if len(selected_mixers) != 1:
            logger.error(
                'Did not find unique mixer "%s". Alternatives are: %s',
                config['audio']['mixer'],
                ', '.join([m.name for m in mixer_classes]) + ', none' or
                'none')
            process.exit_process()
        return selected_mixers[0]
    def start_mixer(self, config, mixer_class):
        logger.info('Starting Mopidy mixer: %s', mixer_class.__name__)
        with _actor_error_handling(mixer_class.__name__):
            mixer = mixer_class.start(config=config).proxy()
            try:
                mixer.ping().get()
                return mixer
            except pykka.ActorDeadError as exc:
                logger.error('Actor died: %s', exc)
        return None
    def configure_mixer(self, config, mixer):
        volume = config['audio']['mixer_volume']
        if volume is not None:
            mixer.set_volume(volume)
            logger.info('Mixer volume set to %d', volume)
        else:
            logger.debug('Mixer volume left unchanged')
    def start_audio(self, config, mixer):
        logger.info('Starting Mopidy audio')
        return Audio.start(config=config, mixer=mixer).proxy()
    def start_backends(self, config, backend_classes, audio):
        logger.info(
            'Starting Mopidy backends: %s',
            ', '.join(b.__name__ for b in backend_classes) or 'none')
        backends = []
        for backend_class in backend_classes:
            with _actor_error_handling(backend_class.__name__):
                with timer.time_logger(backend_class.__name__):
                    backend = backend_class.start(
                        config=config, audio=audio).proxy()
                    backends.append(backend)
        # Block until all on_starts have finished, letting them run in parallel
        for backend in backends[:]:
            try:
                backend.ping().get()
            except pykka.ActorDeadError as exc:
                backends.remove(backend)
                logger.error('Actor died: %s', exc)
        return backends
    def start_core(self, config, mixer, backends, audio):
        logger.info('Starting Mopidy core')
        core = Core.start(
            config=config, mixer=mixer, backends=backends, audio=audio).proxy()
        core.setup().get()
        return core
    def start_frontends(self, config, frontend_classes, core):
        logger.info(
            'Starting Mopidy frontends: %s',
            ', '.join(f.__name__ for f in frontend_classes) or 'none')
        for frontend_class in frontend_classes:
            with _actor_error_handling(frontend_class.__name__):
                with timer.time_logger(frontend_class.__name__):
                    frontend_class.start(config=config, core=core)
    def stop_frontends(self, frontend_classes):
        logger.info('Stopping Mopidy frontends')
        for frontend_class in frontend_classes:
            process.stop_actors_by_class(frontend_class)
    def stop_core(self, core):
        logger.info('Stopping Mopidy core')
        if core:
            core.teardown().get()
        process.stop_actors_by_class(Core)
    def stop_backends(self, backend_classes):
        logger.info('Stopping Mopidy backends')
        for backend_class in backend_classes:
            process.stop_actors_by_class(backend_class)
    def stop_audio(self):
        logger.info('Stopping Mopidy audio')
        process.stop_actors_by_class(Audio)
    def stop_mixer(self, mixer_class):
        logger.info('Stopping Mopidy mixer')
        process.stop_actors_by_class(mixer_class)
class ConfigCommand(Command):
    help = 'Show currently active configuration.'
    def __init__(self):
        super(ConfigCommand, self).__init__()
        self.set(base_verbosity_level=-1)
    def run(self, config, errors, schemas):
        print(config_lib.format(config, schemas, errors))
        return 0
class DepsCommand(Command):
    help = 'Show dependencies and debug information.'
    def __init__(self):
        super(DepsCommand, self).__init__()
        self.set(base_verbosity_level=-1)
    def run(self):
        print(deps.format_dependency_list())
        return 0