## -*- Mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8; -*-

import os, os.path

import shutil

import types

import warnings

import TaskGen

import Task

import Options

import Build

import Utils

all_modules = (

    'core',

    'common',

    'simulator',

    'contrib',

    'node',

    'internet-stack',

    'devices/point-to-point',

    'devices/csma',

    'devices/emu',

    'devices/bridge',

    'devices/tap-bridge',

    'devices/virtual-net-device',

    'applications/onoff',

    'applications/packet-sink',

    'applications/udp-echo',

    'routing/olsr',

    'routing/global-routing',

    'routing/static-routing',

    'routing/list-routing',

    'mobility',

    'devices/wifi',

    'helper',

    'contrib/stats',

    'applications/v4ping',

    'applications/ping6',

    'applications/radvd',

    )

def set_options(opt):

    opt.sub_options('simulator')

    opt.add_option('--enable-rpath',

                   help=("Link programs with rpath"

                         " (normally not needed, see "

                         " --run and --shell; moreover, only works in some"

                         " specific platforms, such as Linux and Solaris)"),

                   action="store_true", dest='enable_rpath', default=False)

    opt.add_option('--enable-modules',

                   help=("Build only these modules (and dependencies)"),

                   dest='enable_modules')

def configure(conf):

    conf.sub_config('core')

    conf.sub_config('simulator')

    conf.sub_config('devices/emu')

    conf.sub_config('devices/wifi')

    conf.sub_config('devices/tap-bridge')

    conf.sub_config('contrib')

    conf.sub_config('internet-stack')

    blddir = os.path.abspath(os.path.join(conf.blddir, conf.env.variant()))

    conf.env.append_value('NS3_MODULE_PATH', blddir)

    if Options.options.enable_rpath:

        conf.env.append_value('RPATH', '-Wl,-rpath=%s' % (os.path.join(blddir),))

    ## Used to link the 'run-tests' program with all of ns-3 code

    conf.env['NS3_MODULES'] = ['ns3-' + module.split('/')[-1] for module in all_modules]

def create_ns3_module(bld, name, dependencies=()):

    module = bld.new_task_gen('cxx')

    module.name = 'ns3-' + name

    module.target = module.name

    module.add_objects = ['ns3-' + dep for dep in dependencies]

    module.module_deps = list(dependencies)

    if not module.env['ENABLE_STATIC_NS3']:

        module.env.append_value('CXXFLAGS', module.env['shlib_CXXFLAGS'])

    elif module.env['CXX_NAME'] == 'gcc' and \

            os.uname()[4] == 'x86_64' and \

            module.env['ENABLE_PYTHON_BINDINGS']:

        # enable that flag for static builds only on x86-64 platforms

        # when gcc is present and only when we want python bindings

        # (it's more efficient to not use this option if we can avoid it)

        module.env.append_value('CXXFLAGS', '-mcmodel=large')

    module.env.append_value('CXXDEFINES', "NS3_MODULE_COMPILATION")

    return module

def create_obj(bld, *args):

    warnings.warn("(in %s) Use bld.new_task_gen(...) now, instead of bld.create_obj(...)" % str(bld.path),

                  DeprecationWarning, stacklevel=2)

    return bld.new_task_gen(*args)

def build(bld):

    bld.create_ns3_module = types.MethodType(create_ns3_module, bld)

    bld.create_obj = types.MethodType(create_obj, bld)

    bld.add_subdirs(list(all_modules))

    for module in all_modules:

        modheader = bld.new_task_gen('ns3moduleheader')

        modheader.module = module.split('/')[-1]

class ns3header_taskgen(TaskGen.task_gen):

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

    COLOR = 'BLUE'

    def __init__(self, *args, **kwargs):

        super(ns3header_taskgen, self).__init__(*args, **kwargs)

        self.install_path = None

        self.sub_dir = None # if not None, header files will be published as ns3/sub_dir/file.h

        self.module = None # module name

    def apply(self):

        if self.module is None:

            raise Utils.WafError("'module' missing on ns3headers object %s" % self)

        ns3_dir_node = self.bld.path.find_dir("ns3")

        if self.sub_dir is not None:

            ns3_dir_node = ns3_dir_node.find_dir(self.sub_dir)

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

            src_node = self.path.find_resource(filename)

            if src_node is None:

                raise Utils.WafError("source ns3 header file %s not found" % (filename,))

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

            assert dst_node is not None

            task = self.create_task('ns3header', self.env)

            task.set_inputs([src_node])

            task.set_outputs([dst_node])

class ns3header_task(Task.Task):

    before = 'cc cxx gen_ns3_module_header_task'

    color = 'BLUE'

    def run(self):

        assert len(self.inputs) == len(self.outputs)

        inputs = [node.srcpath(self.env) for node in self.inputs]

        outputs = [node.bldpath(self.env) for node in self.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

class gen_ns3_module_header_task(Task.Task):

    before = 'cc cxx'

    after = 'ns3header_task'

    color = 'BLUE'

    def run(self):

        assert len(self.outputs) == 1

        header_files = [os.path.basename(node.abspath(self.env)) for node in self.inputs]

        outfile = file(self.outputs[0].bldpath(self.env), "w")

        header_files.sort()

        print >> outfile, """

#ifdef NS3_MODULE_COMPILATION

# error "Do not include ns3 module aggregator headers from other modules; these are meant only for end user scripts."

#endif

#ifndef NS3_MODULE_%s

    """ % (self.module.upper().replace('-', '_'),)

    #     if self.module_deps:

    #         print >> outfile, "// Module dependencies:"

    #     for dep in self.module_deps:

    #         print >> outfile, "#include \"%s-module.h\"" % dep

        print >> outfile

        print >> outfile, "// Module headers:"

        for header in header_files:

            print >> outfile, "#include \"%s\"" % (header,)

        print >> outfile, "#endif"

        outfile.close()

        return 0

    def sig_explicit_deps(self):

        m = Utils.md5()

        m.update('\n'.join([node.abspath(self.env) for node in self.inputs]))

        return m.digest()

    def unique_id(self):

        try:

            return self.uid

        except AttributeError:

            "this is not a real hot zone, but we want to avoid surprizes here"

            m = Utils.md5()

            m.update("ns-3-module-header-%s" % self.module)

            self.uid = m.digest()

            return self.uid

class ns3moduleheader_taskgen(TaskGen.task_gen):

    """

    Generates a 'ns3/foo-module.h' header file that includes all

    public ns3 headers of a certain module.

    """

    COLOR = 'BLUE'

    def __init__(self, *args, **kwargs):

        super(ns3moduleheader_taskgen, self).__init__(*args, **kwargs)

    def apply(self):

        ## get all of the ns3 headers

        ns3_dir_node = self.bld.path.find_dir("ns3")

        all_headers_inputs = []

        found_the_module = False

        for ns3headers in self.bld.all_task_gen:

            if isinstance(ns3headers, ns3header_taskgen):

                if ns3headers.module != self.module:

                    continue

                found_the_module = True

                for source in ns3headers.to_list(ns3headers.source):

                    source = os.path.basename(source)

                    node = ns3_dir_node.find_or_declare(os.path.basename(source))

                    if node is None:

                        fatal("missing header file %s" % (source,))

                    all_headers_inputs.append(node)

        if not found_the_module:

            raise Utils.WscriptError("error finding headers for module %s" % self.module)

        if not all_headers_inputs:

            return

        module_obj = self.bld.name_to_obj("ns3-" + self.module, self.env)

        assert module_obj is not None

        all_headers_outputs = [ns3_dir_node.find_or_declare("%s-module.h" % self.module)]

        task = self.create_task('gen_ns3_module_header', self.env)

        task.set_inputs(all_headers_inputs)

        task.set_outputs(all_headers_outputs)

        task.module = self.module

        task.module_deps = module_obj.module_deps

    def install(self):

        pass