# Copyright (C) 2010 Google Inc. All rights reserved.
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"""Factory method to retrieve the appropriate port implementation."""

import fnmatch
import optparse
import re

from webkitpy.common.webkit_finder import WebKitFinder


class PortFactory(object):
    PORT_CLASSES = (
        'android.AndroidPort',
        'linux.LinuxPort',
        'mac.MacPort',
        'win.WinPort',
        'mock_drt.MockDRTPort',
        'test.TestPort',
    )

    def __init__(self, host):
        self._host = host

    def _default_port(self):
        platform = self._host.platform
        if platform.is_linux() or platform.is_freebsd():
            return 'linux'
        elif platform.is_mac():
            return 'mac'
        elif platform.is_win():
            return 'win'
        raise NotImplementedError('unknown platform: %s' % platform)

    def get(self, port_name=None, options=None, **kwargs):
        """Returns an object implementing the Port interface.

        If port_name is None, this routine attempts to guess at the most
        appropriate port on this platform.
        """
        port_name = port_name or self._default_port()

        _check_configuration_and_target(self._host.filesystem, options)

        if 'browser_test' in port_name:
            module_name, class_name = port_name.rsplit('.', 1)
            module = __import__(module_name, globals(), locals(), [], -1)
            port_class_name = module.get_port_class_name(class_name)
            if port_class_name is not None:
                cls = module.__dict__[port_class_name]
                port_name = cls.determine_full_port_name(self._host, options, class_name)
                return cls(self._host, port_name, options=options, **kwargs)
        else:
            for port_class in self.PORT_CLASSES:
                module_name, class_name = port_class.rsplit('.', 1)
                module = __import__(module_name, globals(), locals(), [], -1)
                cls = module.__dict__[class_name]
                if port_name.startswith(cls.port_name):
                    port_name = cls.determine_full_port_name(self._host, options, port_name)
                    return cls(self._host, port_name, options=options, **kwargs)
        raise NotImplementedError('unsupported platform: "%s"' % port_name)

    def all_port_names(self, platform=None):
        """Returns a list of all valid, fully-specified, "real" port names.

        This is the list of directories that are used as actual baseline_paths()
        by real ports. This does not include any "fake" names like "test"
        or "mock-mac", and it does not include any directories that are not
        port names.

        If platform is not specified, all known port names will be returned.
        """
        platform = platform or '*'
        return fnmatch.filter(self._host.builders.all_port_names(), platform)

    def get_from_builder_name(self, builder_name):
        port_name = self._host.builders.port_name_for_builder_name(builder_name)
        assert port_name, 'unrecognized builder name: "%s"' % builder_name
        return self.get(port_name, options=_builder_options(builder_name))


def platform_options(use_globs=False):
    return [
        optparse.make_option('--android', action='store_const', dest='platform',
                             const=('android*' if use_globs else 'android'),
                             help=('Alias for --platform=android*' if use_globs else 'Alias for --platform=android')),

        optparse.make_option('--platform', action='store',
                             help=('Glob-style list of platform/ports to use (e.g., "mac*")'
                                   if use_globs else 'Platform to use (e.g., "mac-lion")')),
    ]


def configuration_options():
    return [
        optparse.make_option('--debug', action='store_const', const='Debug', dest='configuration',
                             help='Set the configuration to Debug'),
        optparse.make_option('-t', '--target', dest='target',
                             help='Specify the target build subdirectory under src/out/'),
        optparse.make_option('--release', action='store_const', const='Release', dest='configuration',
                             help='Set the configuration to Release'),
    ]


def _builder_options(builder_name):
    return optparse.Values({
        'builder_name': builder_name,
        'configuration': 'Debug' if re.search(r'[d|D](ebu|b)g', builder_name) else 'Release',
        'target': None,
    })


def _check_configuration_and_target(host, options):
    """Updates options.configuration based on options.target."""
    if not options or not getattr(options, 'target', None):
        return

    gn_configuration = _read_configuration_from_gn(host, options)
    if gn_configuration:
        if getattr(options, 'configuration') not in (None, gn_configuration):
            raise ValueError('Configuration does not match the GN build args.')
        options.configuration = gn_configuration
        return

    if options.target in ('Debug', 'Debug_x64'):
        options.configuration = 'Debug'
    elif options.target in ('Release', 'Release_x64'):
        options.configuration = 'Release'
    else:
        raise ValueError('Could not determine build configuration type.\n'
                         'Either switch to one of the default target directories,\n'
                         'use args.gn, or specify --debug or --release explicitly.\n'
                         'If the directory is out/<dir>, then pass -t <dir>.')


def _read_configuration_from_gn(fs, options):
    """Returns the configuration to used based on args.gn, if possible."""

    # TODO(qyearsley): Default to 'out' everywhere.
    build_directory = getattr(options, 'build_directory', None) or 'out'

    target = options.target
    finder = WebKitFinder(fs)
    path = fs.join(finder.chromium_base(), build_directory, target, 'args.gn')
    if not fs.exists(path):
        path = fs.join(finder.chromium_base(), build_directory, target, 'toolchain.ninja')
        if not fs.exists(path):
            # This does not appear to be a GN-based build directory, so we don't know
            # how to interpret it.
            return None

        # toolchain.ninja exists, but args.gn does not; this can happen when
        # `gn gen` is run with no --args.
        return 'Debug'

    args = fs.read_text_file(path)
    for line in args.splitlines():
        if re.match(r'^\s*is_debug\s*=\s*false(\s*$|\s*#.*$)', line):
            return 'Release'

    # If is_debug is set to anything other than false, or if it
    # does not exist at all, we should use the default value (True).
    return 'Debug'