## -*- 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

import Constants

try:

    set

except NameError:

    from sets import Set as set # Python 2.3 fallback

all_modules = (

    'core',

    'network',

    'contrib',

    'internet',

    'propagation',

    'point-to-point',

    'csma',

    'emu',

    'bridge',

    'tap-bridge',

    'virtual-net-device',

    'applications',

    'nix-vector-routing',

    'olsr',

    'aodv',

    'dsdv',

    'click',

    'mobility',

    'wifi',

    'netanim',

    'stats',

    'uan',

    'spectrum',

    'mesh',   

    'test',

    'test/perf',

    'test/ns3tcp',

    'test/nsctcp',

    'test/ns3wifi',

    'contrib/flow-monitor',

    'wimax',

    'lte',

    'mpi',

    'topology-read',

    'contrib/energy',

    'tools/visualizer',

    )

def set_options(opt):

    opt.sub_options('core')

    opt.sub_options('click')

    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('emu')

    conf.sub_config('tap-bridge')

    conf.sub_config('contrib')

    conf.sub_config('internet')

    conf.sub_config('netanim')

    conf.sub_config('test')

    conf.sub_config('click')

    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 'test-runner' 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', 'cc')

    module.is_ns3_module = True

    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'])

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

    elif module.env['CXX_NAME'] in ['gcc', 'icc'] 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('CCFLAGS', '-mcmodel=large')

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

    module.env.append_value('CCDEFINES', "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 ns3_python_bindings(bld):

    env = bld.env

    if not env['ENABLE_PYTHON_BINDINGS']:

        return

    if env['BINDINGS_TYPE'] not in ('modular', 'both'):

        return

    if not bld.path.find_dir("bindings"):

        warnings.warn("(in %s) Requested to build modular python bindings, but apidefs dir not found "

                      "=> skipped the bindings." % str(bld.path),

                      Warning, stacklevel=2)

        return

    # this method is called from a module wscript, so remember bld.path is not bindings/python!

    module_abs_src_path = bld.path.abspath()

    module = os.path.basename(module_abs_src_path)

    apidefs = env['PYTHON_BINDINGS_APIDEFS'].replace("-", "_")

    #debug = ('PYBINDGEN_DEBUG' in os.environ)

    debug = True # XXX

    source = [bld.srcnode.find_resource('bindings/python/ns3modulegen-modular.py').relpath_gen(bld.path),

              "bindings/modulegen__%s.py" % apidefs]

    # the local customization file may or not exist

    if bld.path.find_resource("bindings/modulegen_local.py"):

        source.append("bindings/modulegen_local.py")

    target = ['bindings/module.cc']

    #if not debug:

    #    target.append('ns3modulegen.log')

    argv = ['NS3_ENABLED_FEATURES=${FEATURES}', '${PYTHON}']

    #if debug:

    #    argv.extend(["-m", "pdb"])

    argv.extend(['${SRC[0]}', module_abs_src_path, apidefs, '>', '${TGT[0]}'])

    #if not debug:

    #    argv.extend(['2>', '${TGT[2]}']) # 2> ns3modulegen.log

    features = []

    for (name, caption, was_enabled, reason_not_enabled) in env['NS3_OPTIONAL_FEATURES']:

        if was_enabled:

            features.append(name)

    bindgen = bld.new_task_gen('command', source=source, target=target, command=argv)

    bindgen.env['FEATURES'] = ','.join(features)

    bindgen.dep_vars = ['FEATURES']

    bindgen.before = 'cxx'

    bindgen.after = 'gen_ns3_module_header_task'

    bindgen.name = "pybindgen(ns3 module %s)" % module

    pymod = bld.new_task_gen(features='cxx cshlib pyext')

    pymod.source = ['bindings/module.cc']

    pymod.target = '%s/%s' % (bld.srcnode.find_dir("bindings/python/ns").relpath_gen(bld.path), module)

    pymod.name = 'ns3module_%s' % module

    pymod.uselib_local = "ns3"

    if pymod.env['ENABLE_STATIC_NS3']:

        if sys.platform == 'darwin':

            pymod.env.append_value('LINKFLAGS', '-Wl,-all_load')

            pymod.env.append_value('LINKFLAGS', '-lns3')

        else:

            pymod.env.append_value('LINKFLAGS', '-Wl,--whole-archive,-Bstatic')

            pymod.env.append_value('LINKFLAGS', '-lns3')

            pymod.env.append_value('LINKFLAGS', '-Wl,-Bdynamic,--no-whole-archive')

    defines = list(pymod.env['CXXDEFINES'])

    defines.extend(['NS_DEPRECATED=', 'NS3_DEPRECATED_H'])

    if Options.platform == 'win32':

        try:

            defines.remove('_DEBUG') # causes undefined symbols on win32

        except ValueError:

            pass

    pymod.env['CXXDEFINES'] = defines

def build(bld):

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

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

    bld.ns3_python_bindings = types.MethodType(ns3_python_bindings, 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

        self.mode = 'install'

    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 set(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', env=self.env)

            task.mode = self.mode

            if self.mode == 'install':

                task.set_inputs([src_node])

                task.set_outputs([dst_node])

            else:

                task.header_to_remove = dst_node

class ns3header_task(Task.Task):

    before = 'cc cxx gen_ns3_module_header_task'

    color = 'BLUE'

    def __str__(self):

        "string to display to the user"

        env = self.env

        src_str = ' '.join([a.nice_path(env) for a in self.inputs])

        tgt_str = ' '.join([a.nice_path(env) for a in self.outputs])

        if self.outputs: sep = ' -> '

        else: sep = ''

        if self.mode == 'remove':

            return 'rm-ns3-header %s\n' % (self.header_to_remove.bldpath(self.env),)

        return 'install-ns3-header: %s%s%s\n' % (src_str, sep, tgt_str)

    def runnable_status(self):

        if self.mode == 'remove':

            if os.path.exists(self.header_to_remove.bldpath(self.env)):

                return Constants.RUN_ME

            else:

                return Constants.SKIP_ME

        else:

            return super(ns3header_task, self).runnable_status()

    def run(self):

        if self.mode == 'install':

            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

        else:

            assert len(self.inputs) == 0

            assert len(self.outputs) == 0

            out_file_name = self.header_to_remove.bldpath(self.env)

            try:

                os.unlink(out_file_name)

            except OSError, ex:

                if ex.errno != 2:

                    raise

            return 0

class gen_ns3_module_header_task(Task.Task):

    before = 'cc cxx'

    after = 'ns3header_task'

    color = 'BLUE'

    def runnable_status(self):

        if self.mode == 'remove':

            if os.path.exists(self.header_to_remove.bldpath(self.env)):

                return Constants.RUN_ME

            else:

                return Constants.SKIP_ME

        else:

            return super(gen_ns3_module_header_task, self).runnable_status()

    def __str__(self):

        "string to display to the user"

        env = self.env

        src_str = ' '.join([a.nice_path(env) for a in self.inputs])

        tgt_str = ' '.join([a.nice_path(env) for a in self.outputs])

        if self.outputs: sep = ' -> '

        else: sep = ''

        if self.mode == 'remove':

            return 'rm-module-header %s\n' % (self.header_to_remove.bldpath(self.env),)

        return 'gen-module-header: %s%s%s\n' % (src_str, sep, tgt_str)

    def run(self):

        if self.mode == 'remove':

            assert len(self.inputs) == 0

            assert len(self.outputs) == 0

            out_file_name = self.header_to_remove.bldpath(self.env)

            try:

                os.unlink(out_file_name)

            except OSError, ex:

                if ex.errno != 2:

                    raise

            return 0

        assert len(self.outputs) == 1

        out_file_name = self.outputs[0].bldpath(self.env)

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

        outfile = file(out_file_name, "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):

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

        return self.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)

        self.mode = 'install'

    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 set(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

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

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

        task.module = self.module

        task.mode = self.mode

        if self.mode == 'install':

            task.set_inputs(all_headers_inputs)

            task.set_outputs(all_headers_outputs)

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

            assert module_obj is not None, self.module

            task.module_deps = module_obj.module_deps

        else:

            task.header_to_remove = all_headers_outputs[0]

    def install(self):

        pass