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

def build(bld):
    env = bld.env_of_name('default')

    if env['NS3_ENABLED_MODULES']:
        modules = env['NS3_ENABLED_MODULES']
        changed = True
        while changed:
            changed = False
            for module in modules:
                module_obj = Object.name_to_obj(module)
                if module_obj is None:
                    raise ValueError("module %s not found" % module)
                for dep in module_obj.add_objects:
                    if not dep.startswith('ns3-'):
                        continue
                    if dep not in modules:
                        modules.append(dep)
                        changed = True

        ## remove objects that depend on modules not listed
        for obj in list(Object.g_allobjs):
            if hasattr(obj, 'ns3_module_dependencies'):
                for dep in obj.ns3_module_dependencies:
                    if dep not in modules:
                        Object.g_allobjs.remove(obj)
                        break
            if obj.name in env['NS3_MODULES'] and obj.name not in modules:
                Object.g_allobjs.remove(obj)



    ## Create a single ns3 library containing all modules
    lib = bld.create_obj('cpp', 'shlib')
    lib.name = 'ns3'
    lib.target = 'ns3'
    if env['NS3_ENABLED_MODULES']:
        lib.add_objects = list(modules)
    else:
        lib.add_objects = list(env['NS3_MODULES'])