import shutil

import Action

import Common

import Object

    Object.register('ns3header', Ns3Header)

    Action.Action('ns3_headers', func=_ns3_headers_inst, color='BLUE')

class Ns3Header(Object.genobj):

    """A set of NS-3 header files"""

    def __init__(self, env=None):

        Object.genobj.__init__(self, 'other')

        self.inst_var = 'INCLUDEDIR'

        self.inst_dir = 'ns3'

        self.env = env

        if not self.env:

            self.env = Params.g_build.m_allenvs['default']

    def apply(self):

        ns3_dir_node = Params.g_build.m_srcnode.find_dir("ns3")

        inputs = []

        outputs = []

        for filename in self.to_list(self.source):

            src_node = self.path.find_source(filename)

            if src_node is None:

                Params.fatal("source ns3 header file %s not found" % (filename,))

            dst_node = ns3_dir_node.find_build(os.path.basename(filename))

            assert dst_node is not None

            inputs.append(src_node)

            outputs.append(dst_node)

        task = self.create_task('ns3_headers', self.env, 1)

        task.set_inputs(inputs)

        task.set_outputs(outputs)

    def install(self):

        for i in self.m_tasks:

            current = Params.g_build.m_curdirnode

            lst = map(lambda a: a.relpath_gen(current), i.m_outputs)

            Common.install_files(self.inst_var, self.inst_dir, lst)

def _ns3_headers_inst(task):

    assert len(task.m_inputs) == len(task.m_outputs)

    inputs = [node.srcpath(task.m_env) for node in task.m_inputs]

    outputs = [node.bldpath(task.m_env) for node in task.m_outputs]

    for src, dst in zip(inputs, outputs):

        try:

            os.chmod(dst, 0600)

        except OSError:

            pass

        shutil.copy2(src, dst)

        ## make the headers in builddir read-only, to prevent

        ## accidental modification

        os.chmod(dst, 0400)

    return 0