"""SCons.Tool.qt

Tool-specific initialization for Qt.

There normally shouldn't be any need to import this module directly.
It will usually be imported through the generic SCons.Tool.Tool()
selection method.

"""

#
# __COPYRIGHT__
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
from __future__ import print_function

__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

import os.path
import re

import SCons.Action
import SCons.Builder
import SCons.Defaults
import SCons.Scanner
import SCons.Tool
import SCons.Util

class ToolQtWarning(SCons.Warnings.Warning):
    pass

class GeneratedMocFileNotIncluded(ToolQtWarning):
    pass

class QtdirNotFound(ToolQtWarning):
    pass

SCons.Warnings.enableWarningClass(ToolQtWarning)

header_extensions = [".h", ".hxx", ".hpp", ".hh"]
if SCons.Util.case_sensitive_suffixes('.h', '.H'):
    header_extensions.append('.H')

import SCons.Tool.cxx
cplusplus = SCons.Tool.cxx
#cplusplus = __import__('cxx', globals(), locals(), [])

cxx_suffixes = cplusplus.CXXSuffixes

def checkMocIncluded(target, source, env):
    moc = target[0]
    cpp = source[0]
    # looks like cpp.includes is cleared before the build stage :-(
    # not really sure about the path transformations (moc.cwd? cpp.cwd?) :-/
    path = SCons.Defaults.CScan.path(env, moc.cwd)
    includes = SCons.Defaults.CScan(cpp, env, path)
    if not moc in includes:
        SCons.Warnings.warn(
            GeneratedMocFileNotIncluded,
            "Generated moc file '%s' is not included by '%s'" %
            (str(moc), str(cpp)))

def find_file(filename, paths, node_factory):
    for dir in paths:
        node = node_factory(filename, dir)
        if node.rexists():
            return node
    return None

class _Automoc(object):
    """
    Callable class, which works as an emitter for Programs, SharedLibraries and
    StaticLibraries.
    """

    def __init__(self, objBuilderName):
        self.objBuilderName = objBuilderName
        
    def __call__(self, target, source, env):
        """
        Smart autoscan function. Gets the list of objects for the Program
        or Lib. Adds objects and builders for the special qt files.
        """
        try:
            if int(env.subst('$QT_AUTOSCAN')) == 0:
                return target, source
        except ValueError:
            pass
        try:
            debug = int(env.subst('$QT_DEBUG'))
        except ValueError:
            debug = 0
        
        # some shortcuts used in the scanner
        splitext = SCons.Util.splitext
        objBuilder = getattr(env, self.objBuilderName)
  
        # some regular expressions:
        # Q_OBJECT detection
        q_object_search = re.compile(r'[^A-Za-z0-9]Q_OBJECT[^A-Za-z0-9]') 
        # cxx and c comment 'eater'
        #comment = re.compile(r'(//.*)|(/\*(([^*])|(\*[^/]))*\*/)')
        # CW: something must be wrong with the regexp. See also bug #998222
        #     CURRENTLY THERE IS NO TEST CASE FOR THAT
        
        # The following is kind of hacky to get builders working properly (FIXME)
        objBuilderEnv = objBuilder.env
        objBuilder.env = env
        mocBuilderEnv = env.Moc.env
        env.Moc.env = env
        
        # make a deep copy for the result; MocH objects will be appended
        out_sources = source[:]

        for obj in source:
            if not obj.has_builder():
                # binary obj file provided
                if debug:
                    print("scons: qt: '%s' seems to be a binary. Discarded." % str(obj))
                continue
            cpp = obj.sources[0]
            if not splitext(str(cpp))[1] in cxx_suffixes:
                if debug:
                    print("scons: qt: '%s' is no cxx file. Discarded." % str(cpp)) 
                # c or fortran source
                continue
            #cpp_contents = comment.sub('', cpp.get_text_contents())
            if debug:
                print("scons: qt: Getting contents of %s" % cpp)
            cpp_contents = cpp.get_text_contents()
            h=None
            for h_ext in header_extensions:
                # try to find the header file in the corresponding source
                # directory
                hname = splitext(cpp.name)[0] + h_ext
                h = find_file(hname, (cpp.get_dir(),), env.File)
                if h:
                    if debug:
                        print("scons: qt: Scanning '%s' (header of '%s')" % (str(h), str(cpp)))
                    #h_contents = comment.sub('', h.get_text_contents())
                    h_contents = h.get_text_contents()
                    break
            if not h and debug:
                print("scons: qt: no header for '%s'." % (str(cpp)))
            if h and q_object_search.search(h_contents):
                # h file with the Q_OBJECT macro found -> add moc_cpp
                moc_cpp = env.Moc(h)
                moc_o = objBuilder(moc_cpp)
                out_sources.append(moc_o)
                #moc_cpp.target_scanner = SCons.Defaults.CScan
                if debug:
                    print("scons: qt: found Q_OBJECT macro in '%s', moc'ing to '%s'" % (str(h), str(moc_cpp)))
            if cpp and q_object_search.search(cpp_contents):
                # cpp file with Q_OBJECT macro found -> add moc
                # (to be included in cpp)
                moc = env.Moc(cpp)
                env.Ignore(moc, moc)
                if debug:
                    print("scons: qt: found Q_OBJECT macro in '%s', moc'ing to '%s'" % (str(cpp), str(moc)))
                #moc.source_scanner = SCons.Defaults.CScan
        # restore the original env attributes (FIXME)
        objBuilder.env = objBuilderEnv
        env.Moc.env = mocBuilderEnv

        return (target, out_sources)

AutomocShared = _Automoc('SharedObject')
AutomocStatic = _Automoc('StaticObject')

def _detect(env):
    """Not really safe, but fast method to detect the QT library"""
    QTDIR = None
    if not QTDIR:
        QTDIR = env.get('QTDIR',None)
    if not QTDIR:
        QTDIR = os.environ.get('QTDIR',None)
    if not QTDIR:
        moc = env.WhereIs('moc')
        if moc:
            QTDIR = os.path.dirname(os.path.dirname(moc))
            SCons.Warnings.warn(
                QtdirNotFound,
                "Could not detect qt, using moc executable as a hint (QTDIR=%s)" % QTDIR)
        else:
            QTDIR = None
            SCons.Warnings.warn(
                QtdirNotFound,
                "Could not detect qt, using empty QTDIR")
    return QTDIR

def uicEmitter(target, source, env):
    adjustixes = SCons.Util.adjustixes
    bs = SCons.Util.splitext(str(source[0].name))[0]
    bs = os.path.join(str(target[0].get_dir()),bs)
    # first target (header) is automatically added by builder
    if len(target) < 2:
        # second target is implementation
        target.append(adjustixes(bs,
                                 env.subst('$QT_UICIMPLPREFIX'),
                                 env.subst('$QT_UICIMPLSUFFIX')))
    if len(target) < 3:
        # third target is moc file
        target.append(adjustixes(bs,
                                 env.subst('$QT_MOCHPREFIX'),
                                 env.subst('$QT_MOCHSUFFIX')))
    return target, source

def uicScannerFunc(node, env, path):
    lookout = []
    lookout.extend(env['CPPPATH'])
    lookout.append(str(node.rfile().dir))
    includes = re.findall("<include.*?>(.*?)</include>", node.get_text_contents())
    result = []
    for incFile in includes:
        dep = env.FindFile(incFile,lookout)
        if dep:
            result.append(dep)
    return result

uicScanner = SCons.Scanner.Base(uicScannerFunc,
                                name = "UicScanner", 
                                node_class = SCons.Node.FS.File,
                                node_factory = SCons.Node.FS.File,
                                recursive = 0)

def generate(env):
    """Add Builders and construction variables for qt to an Environment."""
    CLVar = SCons.Util.CLVar
    Action = SCons.Action.Action
    Builder = SCons.Builder.Builder

    env.SetDefault(QTDIR  = _detect(env),
                   QT_BINPATH = os.path.join('$QTDIR', 'bin'),
                   QT_CPPPATH = os.path.join('$QTDIR', 'include'),
                   QT_LIBPATH = os.path.join('$QTDIR', 'lib'),
                   QT_MOC = os.path.join('$QT_BINPATH','moc'),
                   QT_UIC = os.path.join('$QT_BINPATH','uic'),
                   QT_LIB = 'qt', # may be set to qt-mt

                   QT_AUTOSCAN = 1, # scan for moc'able sources

                   # Some QT specific flags. I don't expect someone wants to
                   # manipulate those ...
                   QT_UICIMPLFLAGS = CLVar(''),
                   QT_UICDECLFLAGS = CLVar(''),
                   QT_MOCFROMHFLAGS = CLVar(''),
                   QT_MOCFROMCXXFLAGS = CLVar('-i'),

                   # suffixes/prefixes for the headers / sources to generate
                   QT_UICDECLPREFIX = '',
                   QT_UICDECLSUFFIX = '.h',
                   QT_UICIMPLPREFIX = 'uic_',
                   QT_UICIMPLSUFFIX = '$CXXFILESUFFIX',
                   QT_MOCHPREFIX = 'moc_',
                   QT_MOCHSUFFIX = '$CXXFILESUFFIX',
                   QT_MOCCXXPREFIX = '',
                   QT_MOCCXXSUFFIX = '.moc',
                   QT_UISUFFIX = '.ui',

                   # Commands for the qt support ...
                   # command to generate header, implementation and moc-file
                   # from a .ui file
                   QT_UICCOM = [
                    CLVar('$QT_UIC $QT_UICDECLFLAGS -o ${TARGETS[0]} $SOURCE'),
                    CLVar('$QT_UIC $QT_UICIMPLFLAGS -impl ${TARGETS[0].file} '
                          '-o ${TARGETS[1]} $SOURCE'),
                    CLVar('$QT_MOC $QT_MOCFROMHFLAGS -o ${TARGETS[2]} ${TARGETS[0]}')],
                   # command to generate meta object information for a class
                   # declarated in a header
                   QT_MOCFROMHCOM = (
                          '$QT_MOC $QT_MOCFROMHFLAGS -o ${TARGETS[0]} $SOURCE'),
                   # command to generate meta object information for a class
                   # declarated in a cpp file
                   QT_MOCFROMCXXCOM = [
                    CLVar('$QT_MOC $QT_MOCFROMCXXFLAGS -o ${TARGETS[0]} $SOURCE'),
                    Action(checkMocIncluded,None)])

    # ... and the corresponding builders
    uicBld = Builder(action=SCons.Action.Action('$QT_UICCOM', '$QT_UICCOMSTR'),
                     emitter=uicEmitter,
                     src_suffix='$QT_UISUFFIX',
                     suffix='$QT_UICDECLSUFFIX',
                     prefix='$QT_UICDECLPREFIX',
                     source_scanner=uicScanner)
    mocBld = Builder(action={}, prefix={}, suffix={})
    for h in header_extensions:
        act = SCons.Action.Action('$QT_MOCFROMHCOM', '$QT_MOCFROMHCOMSTR')
        mocBld.add_action(h, act)
        mocBld.prefix[h] = '$QT_MOCHPREFIX'
        mocBld.suffix[h] = '$QT_MOCHSUFFIX'
    for cxx in cxx_suffixes:
        act = SCons.Action.Action('$QT_MOCFROMCXXCOM', '$QT_MOCFROMCXXCOMSTR')
        mocBld.add_action(cxx, act)
        mocBld.prefix[cxx] = '$QT_MOCCXXPREFIX'
        mocBld.suffix[cxx] = '$QT_MOCCXXSUFFIX'

    # register the builders 
    env['BUILDERS']['Uic'] = uicBld
    env['BUILDERS']['Moc'] = mocBld
    static_obj, shared_obj = SCons.Tool.createObjBuilders(env)
    static_obj.add_src_builder('Uic')
    shared_obj.add_src_builder('Uic')

    # We use the emitters of Program / StaticLibrary / SharedLibrary
    # to scan for moc'able files
    # We can't refer to the builders directly, we have to fetch them
    # as Environment attributes because that sets them up to be called
    # correctly later by our emitter.
    env.AppendUnique(PROGEMITTER =[AutomocStatic],
                     SHLIBEMITTER=[AutomocShared],
                     LDMODULEEMITTER=[AutomocShared],
                     LIBEMITTER  =[AutomocStatic],
                     # Of course, we need to link against the qt libraries
                     CPPPATH=["$QT_CPPPATH"],
                     LIBPATH=["$QT_LIBPATH"],
                     LIBS=['$QT_LIB'])

def exists(env):
    return _detect(env)

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