#!/usr/bin/env python
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"""Factory method to retrieve the appropriate port implementation."""

import optparse
import re

from webkitpy.layout_tests.port import builders


def port_options(**help_strings):
    return [
        optparse.make_option("-t", "--target", dest="configuration",
            help="(DEPRECATED)"),
        # FIXME: --help should display which configuration is default.
        optparse.make_option('--debug', action='store_const', const='Debug', dest="configuration",
            help='Set the configuration to Debug'),
        optparse.make_option('--release', action='store_const', const='Release', dest="configuration",
            help='Set the configuration to Release'),
        optparse.make_option('--platform', action='store',
            help=help_strings.get('platform', 'Platform/Port being tested (e.g., "mac-lion")')),
        optparse.make_option("--chromium", action="store_const", const='chromium', dest='platform',
            help='Alias for --platform=chromium'),
        optparse.make_option('--efl', action='store_const', const='efl', dest="platform",
            help='Alias for --platform=efl'),
        optparse.make_option('--gtk', action='store_const', const='gtk', dest="platform",
            help='Alias for --platform=gtk'),
        optparse.make_option('--qt', action='store_const', const='qt', dest="platform",
            help='Alias for --platform=qt'),
        optparse.make_option('--32-bit', action='store_const', const='x86', default=None, dest="architecture",
            help='use 32-bit binaries by default (x86 instead of x86_64)')]


def _builder_options(builder_name):
    configuration = "Debug" if re.search(r"[d|D](ebu|b)g", builder_name) else "Release"
    is_webkit2 = builder_name.find("WK2") != -1
    builder_name = builder_name
    return optparse.Values({'builder_name': builder_name, 'configuration': configuration, 'webkit_test_runner': is_webkit2})


class PortFactory(object):
    PORT_CLASSES = (
        'chromium_android.ChromiumAndroidPort',
        'chromium_linux.ChromiumLinuxPort',
        'chromium_mac.ChromiumMacPort',
        'chromium_win.ChromiumWinPort',
        'efl.EflPort',
        'gtk.GtkPort',
        'mac.MacPort',
        'mock_drt.MockDRTPort',
        'qt.QtPort',
        'test.TestPort',
        'win.WinPort',
    )

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

    def _default_port(self, options):
        platform = self._host.platform
        if platform.is_linux() or platform.is_freebsd():
            return 'chromium-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(options)

        # FIXME(dpranke): We special-case '--platform chromium' so that it can co-exist
        # with '--platform chromium-mac' and '--platform chromium-linux' properly (we
        # can't look at the port_name prefix in this case).
        if port_name == 'chromium':
            port_name = 'chromium-' + self._host.platform.os_name

        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):
        """Return 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 ."""
        # FIXME: There's probably a better way to generate this list ...
        return builders.all_port_names()

    def get_from_builder_name(self, builder_name):
        port_name = builders.port_name_for_builder_name(builder_name)
        assert(port_name)  # Need to update port_name_for_builder_name
        port = self.get(port_name, _builder_options(builder_name))
        assert(port)  # Need to update port_name_for_builder_name
        return port
