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

import re

import os

import pproc as subprocess

import shutil

import sys

import Task

import Options

import Configure

import TaskGen

import Logs

import Build

import Utils

## https://launchpad.net/pybindgen/

REQUIRED_PYBINDGEN_VERSION = (0, 10, 0, 630)

REQUIRED_PYGCCXML_VERSION = (0, 9, 5)

def add_to_python_path(path):

    if os.environ.get('PYTHONPATH', ''):

        os.environ['PYTHONPATH'] = path + os.pathsep + os.environ.get('PYTHONPATH')

    else:

        os.environ['PYTHONPATH'] = path

def set_pybindgen_pythonpath(env):

    if env['WITH_PYBINDGEN']:

        add_to_python_path(env['WITH_PYBINDGEN'])

def set_options(opt):

    opt.tool_options('python')

    opt.add_option('--disable-python',

                   help=("Don't build Python bindings."),

                   action="store_true", default=False,

                   dest='python_disable')

    opt.add_option('--python-scan',

                   help=("Rescan Python bindings.  Needs working GCCXML / pygccxml environment."),

                   action="store_true", default=False,

                   dest='python_scan')

    opt.add_option('--with-pybindgen',

                   help=('Path to an existing pybindgen source tree to use.'),

                   default=None,

                   dest='with_pybindgen', type="string")

def configure(conf):

    conf.env['ENABLE_PYTHON_BINDINGS'] = False

    if Options.options.python_disable:

        conf.report_optional_feature("python", "Python Bindings", False,

                                     "disabled by user request")

        return

    conf.check_tool('misc')

    if sys.platform == 'cygwin':

        conf.report_optional_feature("python", "Python Bindings", False,

                                     "unsupported platform 'cygwin'")

        Logs.warn("Python is not supported in CygWin environment.  Try MingW instead.")

        return

    ## Check for Python

    try:

        conf.check_tool('python')

        conf.check_python_version((2,3))

        conf.check_python_headers()

    except Configure.ConfigurationError, ex:

        conf.report_optional_feature("python", "Python Bindings", False, str(ex))

        return

    # -fvisibility=hidden optimization

        conf.env.append_value('CXXFLAGS_PYEXT', '-fvisibility=hidden')

        conf.env.append_value('CCFLAGS_PYEXT', '-fvisibility=hidden')

    # Check for the location of pybindgen

    if Options.options.with_pybindgen is not None:

        if os.path.isdir(Options.options.with_pybindgen):

            conf.check_message("pybindgen location", '', True, ("%s (given)" % Options.options.with_pybindgen))

            conf.env['WITH_PYBINDGEN'] = os.path.abspath(Options.options.with_pybindgen)

    else:

        pybindgen_dir = os.path.join('..', "pybindgen")

        if os.path.isdir(pybindgen_dir):

            conf.check_message("pybindgen location", '', True, ("%s (guessed)" % pybindgen_dir))

            conf.env['WITH_PYBINDGEN'] = os.path.abspath(pybindgen_dir)

        del pybindgen_dir

    if not conf.env['WITH_PYBINDGEN']:

        conf.check_message("pybindgen location", '', False)

    # Check for pybindgen

    set_pybindgen_pythonpath(conf.env)

    try:

        conf.check_python_module('pybindgen')

    except Configure.ConfigurationError:

        Logs.warn("pybindgen missing => no python bindings")

        conf.report_optional_feature("python", "Python Bindings", False,

                                     "PyBindGen missing")

        return

    else:

        out = subprocess.Popen([conf.env['PYTHON'], "-c",

                                "import pybindgen.version; "

                                "print '.'.join([str(x) for x in pybindgen.version.__version__])"],

                                stdout=subprocess.PIPE).communicate()[0]

        pybindgen_version_str = out.strip()

        pybindgen_version = tuple([int(x) for x in pybindgen_version_str.split('.')])

        conf.check_message('pybindgen', 'version',

                           (pybindgen_version >= REQUIRED_PYBINDGEN_VERSION),

                           pybindgen_version_str)

        if not (pybindgen_version >= REQUIRED_PYBINDGEN_VERSION):

            Logs.warn("pybindgen (found %s) is too old (need %s)" %

                    (pybindgen_version_str,

                     '.'.join([str(x) for x in REQUIRED_PYBINDGEN_VERSION])))

            conf.report_optional_feature("python", "Python Bindings", False,

                                         "PyBindGen too old and newer version could not be retrieved")

            return

    ## If all has gone well, we finally enable the Python bindings

    conf.env['ENABLE_PYTHON_BINDINGS'] = True

    conf.report_optional_feature("python", "Python Bindings", True, None)

    ## Check for pygccxml

    try:

        conf.check_python_module('pygccxml')

    except Configure.ConfigurationError:

        conf.report_optional_feature("pygccxml", "Python API Scanning Support", False,

                                     "Missing 'pygccxml' Python module")

        return

    out = subprocess.Popen([conf.env['PYTHON'], "-c",

                            "import pygccxml; print pygccxml.__version__"],

                            stdout=subprocess.PIPE).communicate()[0]

    pygccxml_version_str = out.strip()

    pygccxml_version = tuple([int(x) for x in pygccxml_version_str.split('.')])

    conf.check_message('pygccxml', 'version',

                       (pygccxml_version >= REQUIRED_PYGCCXML_VERSION),

                       pygccxml_version_str)

    if not (pygccxml_version >= REQUIRED_PYGCCXML_VERSION):

        Logs.warn("pygccxml (found %s) is too old (need %s) => "

                "automatic scanning of API definitions will not be possible" %

                (pygccxml_version_str,

                 '.'.join([str(x) for x in REQUIRED_PYGCCXML_VERSION])))

        conf.report_optional_feature("pygccxml", "Python API Scanning Support", False,

                                     "pygccxml too old")

        return

    ## Check gccxml version

    gccxml = conf.find_program('gccxml', var='GCCXML')

    if not gccxml:

        Logs.warn("gccxml missing; automatic scanning of API definitions will not be possible")

        conf.report_optional_feature("pygccxml", "Python API Scanning Support", False,

                                     "gccxml missing")

        return

    gccxml_version_line = os.popen(gccxml + " --version").readline().strip()

    m = re.match( "^GCC-XML version (\d\.\d(\.\d)?)$", gccxml_version_line)

    gccxml_version = m.group(1)

    gccxml_version_ok = ([int(s) for s in gccxml_version.split('.')] >= [0, 9])

    conf.check_message('gccxml', 'version', True, gccxml_version)

    if not gccxml_version_ok:

        Logs.warn("gccxml too old, need version >= 0.9; automatic scanning of API definitions will not be possible")

        conf.report_optional_feature("pygccxml", "Python API Scanning Support", False,

                                     "gccxml too old")

        return

    ## If we reached

    conf.env['ENABLE_PYTHON_SCANNING'] = True

    conf.report_optional_feature("pygccxml", "Python API Scanning Support", True, None)

prio_headers = {

    -2: (

        "string.h", # work around http://www.gccxml.org/Bug/view.php?id=6682

        ),

    -1: (

        "propagation-delay-model.h",

        "propagation-loss-model.h",

        "net-device.h",

        )

     }

def get_header_prio(header):

    for prio, headers in prio_headers.iteritems():

        if header in headers:

            return prio

    return 1

def calc_header_include(path):

    (head, tail) = os.path.split (path)

    if tail == 'ns3':

        return ''

    else:

        return os.path.join (calc_header_include (head), tail)

class gen_everything_h_task(Task.Task):

    before = 'cc cxx'

    after = 'ns3header_task'

    color = 'BLUE'

    def run(self):

        assert len(self.outputs) == 1

        header_files = [calc_header_include(node.abspath(self.env)) for node in self.inputs]

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

        def sort_func(h1, h2):

            return cmp((get_header_prio(h1), h1), (get_header_prio(h1), h2))

        header_files.sort(sort_func)

        print >> outfile, """

/* http://www.nsnam.org/bugzilla/show_bug.cgi?id=413 */

#ifdef ECHO

# undef ECHO

#endif

    """

        for header in header_files:

            print >> outfile, "#include \"ns3/%s\"" % (header,)

        print >> outfile, """

namespace ns3 {

static inline Ptr<Object>

__dummy_function_to_force_template_instantiation (Ptr<Object> obj, TypeId typeId)

{

   return obj->GetObject<Object> (typeId);

}

static inline void

__dummy_function_to_force_template_instantiation_v2 ()

{

   Time t1, t2, t3;

   t1 = t2 + t3;

   t1 = t2 - t3;

   TimeSquare tsq = t2*t3;

   Time tsqdiv = tsq/Seconds(1);

   Scalar scal = t2/t3;

   TimeInvert inv = scal/t3;

   t1 = scal*t1;

   t1 = t1/scal;

   t1 < t2;

   t1 <= t2;

   t1 == t2;

   t1 != t2;

   t1 >= t2;

   t1 > t2;

}

}

"""

        outfile.close()

        return 0

class all_ns3_headers_taskgen(TaskGen.task_gen):

    """Generates a 'everything.h' header file that includes some/all public ns3 headers.

    This single header file is to be parsed only once by gccxml, for greater efficiency.

    """

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

        super(all_ns3_headers_taskgen, self).__init__(*args, **kwargs)

        self.install_path = None

        #self.inst_dir = 'ns3'

    def apply(self):

        ## get all of the ns3 headers

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

        all_headers_inputs = []

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

            src_node = ns3_dir_node.find_or_declare(filename)

            if src_node is None:

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

            all_headers_inputs.append(src_node)

        ## if self.source was empty, include all ns3 headers in enabled modules

        if not all_headers_inputs:

            for ns3headers in Build.bld.all_task_gen:

                if type(ns3headers).__name__ == 'ns3header_taskgen': # XXX: find less hackish way to compare

                    ## skip headers not part of enabled modules

                    if self.env['NS3_ENABLED_MODULES']:

                        if ("ns3-%s" % ns3headers.module) not in self.env['NS3_ENABLED_MODULES']:

                            continue

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

                        #source = os.path.basename(source)

                        node = ns3_dir_node.find_or_declare(source)

                        if node is None:

                            raise Utils.WafError("missing header file %s" % (source,))

                        all_headers_inputs.append(node)

        assert all_headers_inputs

        all_headers_outputs = [self.path.find_or_declare("everything.h")]

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

        task.set_inputs(all_headers_inputs)

        task.set_outputs(all_headers_outputs)

    def install(self):

        pass

def get_modules_and_headers():

    """

    Gets a dict of

       module_name => ([module_dep1, module_dep2, ...], [module_header1, module_header2, ...])

    tuples, one for each module.

    """

    retval = {}

    for module in Build.bld.all_task_gen:

        if not module.name.startswith('ns3-'):

            continue

        module_name = module.name[4:] # strip the ns3- prefix

        ## find the headers object for this module

        headers = []

        for ns3headers in Build.bld.all_task_gen:

            if type(ns3headers).__name__ != 'ns3header_taskgen': # XXX: find less hackish way to compare

                continue

            if ns3headers.module != module_name:

                continue

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

                headers.append(source)

        retval[module_name] = (list(module.module_deps), headers)

    return retval

class python_scan_task(Task.TaskBase):

    """Uses gccxml to scan the file 'everything.h' and extract API definitions.

    """

    after = 'gen_everything_h_task'

    before = 'cc cxx'

    def __init__(self, curdirnode, env):

        super(python_scan_task, self).__init__()

        self.curdirnode = curdirnode

        self.env = env

    def display(self):

        return 'python-scan\n'

    def run(self):

        #print "Rescanning the python bindings..."

        argv = [

            self.env['PYTHON'],

            os.path.join(self.curdirnode.abspath(), 'ns3modulescan.py'), # scanning script

            self.curdirnode.find_dir('../..').abspath(self.env), # include path (where the ns3 include dir is)

            self.curdirnode.find_or_declare('everything.h').abspath(self.env),

            os.path.join(self.curdirnode.abspath(), 'ns3modulegen_generated.py'), # output file

            ]

        scan = subprocess.Popen(argv, stdin=subprocess.PIPE)

        scan.stdin.write(repr(get_modules_and_headers()))

        scan.stdin.close()

        retval = scan.wait()

        print "Scan finished with exit code", retval

        if retval:

            return retval

        # signal stop (we generated files into the source dir and WAF

        # can't cope with it, so we have to force the user to restart

        # WAF)

        Build.bld.generator.stop = 1

        return 0

def build(bld):

    if Options.options.python_disable:

        return

    env = bld.env

    curdir = bld.path.abspath()

    set_pybindgen_pythonpath(env)

    if env['ENABLE_PYTHON_BINDINGS']:

        obj = bld.new_task_gen('all_ns3_headers')

    if Options.options.python_scan:

        if not env['ENABLE_PYTHON_SCANNING']:

            raise Utils.WafError("Cannot re-scan python bindings: (py)gccxml not available")

        python_scan_task(bld.path, env)

        return

    ## Get a list of scanned modules; the set of scanned modules

    ## may be smaller than the set of all modules, in case a new

    ## ns3 module is being developed which wasn't scanned yet.

    scanned_modules = []

    for filename in os.listdir(curdir):

        m = re.match(r"^ns3_module_(.+)\.py$", filename)

        if m is None:

            continue

        name = m.group(1)

        if name.endswith("__local"):

            continue

        scanned_modules.append(name)

    if env['ENABLE_PYTHON_BINDINGS']:

        source = [

            'ns3modulegen.py',

            'ns3modulegen_generated.py',

            'ns3modulegen_core_customizations.py',

            ]

        target = [

            'ns3module.cc',

            'ns3module.h',

            'ns3modulegen.log',

            ]

        argv = ['NS3_ENABLED_FEATURES=${FEATURES}', '${PYTHON}', '${SRC[0]}', '${TGT[0]}']

        argv.extend(get_modules_and_headers().iterkeys())

        for module in scanned_modules:

            source.append("ns3_module_%s.py" % module)

            local = "ns3_module_%s__local.py" % module

            if os.path.exists(os.path.join(curdir, local)):

                source.append(local)

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

        for module in scanned_modules:

            target.append("ns3_module_%s.cc" % module)

        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, variables=dict(FEATURES=(','.join(features))))

        bindgen.before = 'cxx'

        bindgen.after = 'gen_everything_h_task'

    ## we build python bindings if either we have the tools to

    ## generate them or if the pregenerated source file is already

    ## present in the source dir.

    if env['ENABLE_PYTHON_BINDINGS'] \

            or os.path.exists(os.path.join(bld.path.abspath(), 'ns3module.cc')):

        pymod = bld.new_task_gen('cxx', 'shlib', 'pyext')

        pymod.source = ['ns3module.cc', 'ns3module_helpers.cc']

        pymod.includes = '.'

        for module in scanned_modules:

            pymod.source.append("ns3_module_%s.cc" % module)

        pymod.target = 'ns3/_ns3'

        pymod.name = 'ns3module'

        pymod.uselib_local = "ns3"

        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

        # copy the __init__.py file to the build dir. waf can't handle

        # this, it's against waf's principles to have build dir files

        # with the same name as source dir files, apparently.

        dirnode = bld.path.find_dir('ns3')

        src = os.path.join(dirnode.abspath(), '__init__.py')

        dst = os.path.join(dirnode.abspath(env), '__init__.py')

        try:

            need_copy = os.stat(src).st_mtime > os.stat(dst).st_mtime

        except OSError:

            need_copy = True

        if need_copy:

            try:

                os.mkdir(os.path.dirname(dst))

            except OSError:

                pass

            print "%r -> %r" % (src, dst)

            shutil.copy2(src, dst)