#   Copyright 2013 Ben Longbons <b.r.longbons@gmail.com>
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from __future__ import print_function, division, absolute_import

from ..classy import ClassyProject
from ..types import triple


# TODO: see if there's a way to expose them sanely, without using Nones
# (currently I never emit them: instead I pop the order)
def build(build, BUILD):
    pass

def host(build, HOST):
    if HOST is None:
        BUILD = build.vars['BUILD']
        build.vars['HOST'] = BUILD

def target(build, TARGET):
    if TARGET is None:
        HOST = build.vars['HOST']
        build.vars['TARGET'] = HOST

class Arches2(ClassyProject):
    __slots__ = ()

    def arches(self):
        super(Arches2, self).arches()
        self.add_help('System types:', hidden=False)
        self.add_option('--build', init=None,
                type=triple, check=build,
                help='configure for building on BUILD', hidden=False,
                help_def='native')
        self.order.pop()
        self.add_option('--host', init=None,
                type=triple, check=host,
                help='cross-compile to build programs to run on HOST',
                hidden=False, help_def='BUILD')
        self.order.pop()

# TODO figure out the mro implications when I use this
class Arches3(Arches2):
    __slots__ = ()
    def arches(self):
        super(Arches3, self).arches()
        self.add_option('--target', init=None,
                type=triple, check=target,
                help='configure for building compilers for TARGET',
                hidden=False, help_def='HOST')
        self.order.pop()