"""generic

Generic tool that provides a commmon ground for all platforms.

"""

#
# Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
# All Rights Reserved.
#
# 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, sub license, 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 (including the
# next paragraph) 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 NON-INFRINGEMENT.
# IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
#


import os
import os.path
import re
import platform as _platform
import sys

import SCons.Action
import SCons.Builder
import SCons.Scanner


def symlink(target, source, env):
    target = str(target[0])
    source = str(source[0])
    if os.path.islink(target) or os.path.exists(target):
        os.remove(target)
    os.symlink(os.path.basename(source), target)

def install_shared_library(env, source, version = ()):
    source = str(source[0])
    version = tuple(map(str, version))
    target_dir =  os.path.join(env.Dir('#.').srcnode().abspath, env['build'], 'lib')
    target_name = '.'.join((str(source),) + version)
    last = env.InstallAs(os.path.join(target_dir, target_name), source)
    while len(version):
        version = version[:-1]
        target_name = '.'.join((str(source),) + version)
        action = SCons.Action.Action(symlink, "$TARGET -> $SOURCE")
        last = env.Command(os.path.join(target_dir, target_name), last, action) 

def createInstallMethods(env):
    env.AddMethod(install_shared_library, 'InstallSharedLibrary')


_platform_map = {
    'linux2': 'linux',
    'win32': 'windows',
}


_machine_map = {
	'x86': 'x86',
	'i386': 'x86',
	'i486': 'x86',
	'i586': 'x86',
	'i686': 'x86',
	'ppc': 'ppc',
	'x86_64': 'x86_64',
}


_toolchain_map = {
    'winddk': 'winddk',
    'wince': 'wcesdk',
}


_bool_map = {
    'y': 1, 
    'yes': 1,
    't': 1, 
    'true': 1, 
    '1': 1,
    'on': 1,
    'all': 1, 
    'n': 0, 
    'no': 0, 
    'f': 0, 
    'false': 0, 
    '0': 0,
    'off': 0,
    'none': 0,
}


def num_jobs():
    try:
        return int(os.environ['NUMBER_OF_PROCESSORS'])
    except (ValueError, KeyError):
        pass

    try:
        return os.sysconf('SC_NPROCESSORS_ONLN')
    except (ValueError, OSError, AttributeError):
        pass

    try:
        return int(os.popen2("sysctl -n hw.ncpu")[1].read())
    except ValueError:
        pass

    return 1


def generate(env):
    """Common environment generation code"""

    from SCons.Script import ARGUMENTS

    # FIXME: this is already too late
    #if env.get('quiet', False):
    #    quietCommandLines(env)


    # Platform
    try:
        env['platform'] = ARGUMENTS['platform']
    except KeyError:
        env['platform'] = _platform_map.get(sys.platform, sys.platform)

    # Machine
    try:
        env['machine'] = ARGUMENTS['machine']
    except KeyError:
        env['machine'] = _machine_map.get(os.environ.get('PROCESSOR_ARCHITECTURE', _platform.machine()), 'generic')

    # Toolchain
    try:
        env['toolchain'] = ARGUMENTS['toolchain']
    except KeyError:
        if env['platform'] in ('windows', 'winddk', 'wince') and sys.platform != 'win32':
            env['toolchain'] = 'crossmingw'
        else:
            env['toolchain'] = _toolchain_map.get(env['platform'], 'default')
    if env['toolchain'] == 'crossmingw' and env['machine'] not in ('generic', 'x86'):
            env['machine'] = 'x86'

    try:
        env['MSVS_VERSION'] = ARGUMENTS['MSVS_VERSION']
    except KeyError:
        pass

    # Build type
    env['debug'] = _bool_map[ARGUMENTS.get('debug', 'no')]
    env['profile'] = _bool_map[ARGUMENTS.get('profile', 'no')]

    # Put build output in a separate dir, which depends on the current
    # configuration. See also http://www.scons.org/wiki/AdvancedBuildExample
    try:
        env['build'] = ARGUMENTS['build']
    except KeyError:
        build_topdir = 'build'
        build_subdir = env['platform']
        if env['machine'] != 'generic':
            build_subdir += '-' + env['machine']
        if env['debug']:
            build_subdir += "-debug"
        if env['profile']:
            build_subdir += "-profile"
        env['build'] = os.path.join(build_topdir, build_subdir)
    # Place the .sconsign file in the build dir too, to avoid issues with
    # different scons versions building the same source file
    env.SConsignFile(os.path.join(env['build'], '.sconsign'))

    # Parallel build
    if env.GetOption('num_jobs') <= 1:
        env.SetOption('num_jobs', num_jobs())

    # Summary
    print
    print '  platform=%s' % env['platform']
    print '  machine=%s' % env['machine']
    print '  toolchain=%s' % env['toolchain']
    print '  debug=%s' % ['no', 'yes'][env['debug']]
    print '  profile=%s' % ['no', 'yes'][env['profile']]
    print '  build=%s' % env['build']
    print '  %s jobs' % env.GetOption('num_jobs')
    print

    # Load tool chain
    env.Tool(env['toolchain'])

    env['gcc'] = 'gcc' in os.path.basename(env['CC']).split('-')
    env['msvc'] = env['CC'] == 'cl'

    # shortcuts
    debug = env['debug']
    machine = env['machine']
    platform = env['platform']
    x86 = env['machine'] == 'x86'
    ppc = env['machine'] == 'ppc'
    gcc = env['gcc']
    msvc = env['msvc']

    # C preprocessor options
    cppdefines = []
    if debug:
        cppdefines += ['DEBUG']
    else:
        cppdefines += ['NDEBUG']
    if env['profile']:
        cppdefines += ['PROFILE']
    if platform == 'windows':
        cppdefines += [
            'WIN32',
            '_WINDOWS',
            #'_UNICODE',
            #'UNICODE',
        ]
        if msvc:
            cppdefines += [
                'VC_EXTRALEAN',
                '_USE_MATH_DEFINES',
                '_CRT_SECURE_NO_WARNINGS',
                '_CRT_SECURE_NO_DEPRECATE',
                '_SCL_SECURE_NO_WARNINGS',
                '_SCL_SECURE_NO_DEPRECATE',
            ]
        if debug:
            cppdefines += ['_DEBUG']
    if platform == 'winddk':
        # Mimic WINDDK's builtin flags. See also:
        # - WINDDK's bin/makefile.new i386mk.inc for more info.
        # - buildchk_wxp_x86.log files, generated by the WINDDK's build
        # - http://alter.org.ua/docs/nt_kernel/vc8_proj/
        cppdefines += [
            ('_X86_', '1'),
            ('i386', '1'),
            'STD_CALL',
            ('CONDITION_HANDLING', '1'),
            ('NT_INST', '0'),
            ('WIN32', '100'),
            ('_NT1X_', '100'),
            ('WINNT', '1'),
            ('_WIN32_WINNT', '0x0501'), # minimum required OS version
            ('WINVER', '0x0501'),
            ('_WIN32_IE', '0x0603'),
            ('WIN32_LEAN_AND_MEAN', '1'),
            ('DEVL', '1'),
            ('__BUILDMACHINE__', 'WinDDK'),
            ('FPO', '0'),
        ]
        if debug:
            cppdefines += [('DBG', 1)]
    if platform == 'wince':
        cppdefines += [
            '_CRT_SECURE_NO_DEPRECATE',
            '_USE_32BIT_TIME_T',
            'UNICODE',
            '_UNICODE',
            ('UNDER_CE', '600'),
            ('_WIN32_WCE', '0x600'),
            'WINCEOEM',
            'WINCEINTERNAL',
            'WIN32',
            'STRICT',
            'x86',
            '_X86_',
            'INTERNATIONAL',
            ('INTLMSG_CODEPAGE', '1252'),
        ]
    env.Append(CPPDEFINES = cppdefines)

    # C preprocessor includes
    if platform == 'winddk':
        env.Append(CPPPATH = [
            env['SDK_INC_PATH'],
            env['DDK_INC_PATH'],
            env['WDM_INC_PATH'],
            env['CRT_INC_PATH'],
        ])

    # C compiler options
    cflags = [] # C
    cxxflags = [] # C++
    ccflags = [] # C & C++
    if gcc:
        if debug:
            ccflags += ['-O0', '-g3']
        elif env['toolchain'] == 'crossmingw':
            ccflags += ['-O0', '-g3'] # mingw 4.2.1 optimizer is broken
        else:
            ccflags += ['-O3', '-g0']
        if env['machine'] == 'x86':
            ccflags += [
                '-m32',
                #'-march=pentium4',
                '-mmmx', '-msse', '-msse2', # enable SIMD intrinsics
                #'-mfpmath=sse',
            ]
        if env['machine'] == 'x86_64':
            ccflags += ['-m64']
        # See also:
        # - http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
        ccflags += [
            '-Wall',
            '-Wmissing-field-initializers',
            '-Wpointer-arith',
            '-Wno-long-long',
            '-ffast-math',
            '-fmessage-length=0', # be nice to Eclipse
        ]
        cflags += [
            '-Werror=declaration-after-statement',
            '-Wmissing-prototypes',
            '-std=gnu99',
        ]
    if msvc:
        # See also:
        # - http://msdn.microsoft.com/en-us/library/19z1t1wy.aspx
        # - cl /?
        if debug:
            ccflags += [
              '/Od', # disable optimizations
              '/Oi', # enable intrinsic functions
              '/Oy-', # disable frame pointer omission
              '/GL-', # disable whole program optimization
            ]
        else:
            ccflags += [
              '/Ox', # maximum optimizations
              '/Oi', # enable intrinsic functions
              '/Ot', # favor code speed
              #'/fp:fast', # fast floating point 
            ]
        ccflags += [
            '/W3', # warning level
            #'/Wp64', # enable 64 bit porting warnings
        ]
        if env['machine'] == 'x86':
            ccflags += [
                #'/QIfist', # Suppress _ftol
                #'/arch:SSE2', # use the SSE2 instructions
            ]
        if platform == 'windows':
            ccflags += [
                # TODO
            ]
        if platform == 'winddk':
            ccflags += [
                '/Zl', # omit default library name in .OBJ
                '/Zp8', # 8bytes struct member alignment
                '/Gy', # separate functions for linker
                '/Gm-', # disable minimal rebuild
                '/WX', # treat warnings as errors
                '/Gz', # __stdcall Calling convention
                '/GX-', # disable C++ EH
                '/GR-', # disable C++ RTTI
                '/GF', # enable read-only string pooling
                '/G6', # optimize for PPro, P-II, P-III
                '/Ze', # enable extensions
                '/Gi-', # disable incremental compilation
                '/QIfdiv-', # disable Pentium FDIV fix
                '/hotpatch', # prepares an image for hotpatching.
                #'/Z7', #enable old-style debug info
            ]
        if platform == 'wince':
            # See also C:\WINCE600\public\common\oak\misc\makefile.def
            ccflags += [
                '/Zl', # omit default library name in .OBJ
                '/GF', # enable read-only string pooling
                '/GR-', # disable C++ RTTI
                '/GS', # enable security checks
                # Allow disabling language conformance to maintain backward compat
                #'/Zc:wchar_t-', # don't force wchar_t as native type, instead of typedef
                #'/Zc:forScope-', # don't enforce Standard C++ for scoping rules
                #'/wd4867',
                #'/wd4430',
                #'/MT',
                #'/U_MT',
            ]
        # Automatic pdb generation
        # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
        env.EnsureSConsVersion(0, 98, 0)
        env['PDB'] = '${TARGET.base}.pdb'
    env.Append(CCFLAGS = ccflags)
    env.Append(CFLAGS = cflags)
    env.Append(CXXFLAGS = cxxflags)

    if env['platform'] == 'windows' and msvc:
        # Choose the appropriate MSVC CRT
        # http://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx
        if env['debug']:
            env.Append(CCFLAGS = ['/MTd'])
            env.Append(SHCCFLAGS = ['/LDd'])
        else:
            env.Append(CCFLAGS = ['/MT'])
            env.Append(SHCCFLAGS = ['/LD'])
    
    # Assembler options
    if gcc:
        if env['machine'] == 'x86':
            env.Append(ASFLAGS = ['-m32'])
        if env['machine'] == 'x86_64':
            env.Append(ASFLAGS = ['-m64'])

    # Linker options
    linkflags = []
    if gcc:
        if env['machine'] == 'x86':
            linkflags += ['-m32']
        if env['machine'] == 'x86_64':
            linkflags += ['-m64']
    if platform == 'windows' and msvc:
        # See also:
        # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
        linkflags += [
            '/fixed:no',
            '/incremental:no',
        ]
    if platform == 'winddk':
        linkflags += [
            '/merge:_PAGE=PAGE',
            '/merge:_TEXT=.text',
            '/section:INIT,d',
            '/opt:ref',
            '/opt:icf',
            '/ignore:4198,4010,4037,4039,4065,4070,4078,4087,4089,4221',
            '/incremental:no',
            '/fullbuild',
            '/release',
            '/nodefaultlib',
            '/wx',
            '/debug',
            '/debugtype:cv',
            '/version:5.1',
            '/osversion:5.1',
            '/functionpadmin:5',
            '/safeseh',
            '/pdbcompress',
            '/stack:0x40000,0x1000',
            '/driver',
            '/align:0x80',
            '/subsystem:native,5.01',
            '/base:0x10000',

            '/entry:DrvEnableDriver',
        ]
        if env['debug'] or env['profile']:
            linkflags += [
                '/MAP', # http://msdn.microsoft.com/en-us/library/k7xkk3e2.aspx
            ]
    if platform == 'wince':
        linkflags += [
            '/nodefaultlib',
            #'/incremental:no',
            #'/fullbuild',
            '/entry:_DllMainCRTStartup',
        ]
    env.Append(LINKFLAGS = linkflags)

    # Default libs
    env.Append(LIBS = [])

    # Custom builders and methods
    env.Tool('custom')
    createInstallMethods(env)

    # for debugging
    #print env.Dump()


def exists(env):
    return 1