# vim: set sts=2 ts=8 sw=2 tw=99 et ft=python:
import os, sys

# Simple extensions do not need to modify this file.

def ResolveEnvPath(env, folder):
  if env in os.environ:
    path = os.environ[env]
    if os.path.isdir(path):
      return path
    return None

  head = os.getcwd()
  oldhead = None
  while head != None and head != oldhead:
    path = os.path.join(head, folder)
    if os.path.isdir(path):
      return path
    oldhead = head
    head, tail = os.path.split(head)

  return None

def Normalize(path):
  return os.path.abspath(os.path.normpath(path))

def SetArchFlags(compiler):
  if compiler.behavior == 'gcc':
    if compiler.target.arch == 'x86_64':
      compiler.cflags += ['-fPIC']
  elif compiler.like('msvc'):
    if compiler.target.arch == 'x86_64':
      compiler.defines += ['WIN64']

class ExtensionConfig(object):
  def __init__(self):
    self.binaries = []
    self.extensions = []
    self.generated_headers = None
    self.mms_root = None
    self.sm_root = None
    self.all_targets = []
    self.target_archs = set()

    if builder.options.targets:
      target_archs = builder.options.targets.split(',')
    else:
      target_archs = ['x86', 'x86_64']

    for arch in target_archs:
        try:
            cxx = builder.DetectCxx(target_arch = arch)
            self.target_archs.add(cxx.target.arch)
        except Exception as e:
            # Error if archs were manually overridden.
            if builder.options.targets:
                raise
            print('Skipping target {}: {}'.format(arch, e))
            continue
        self.all_targets.append(cxx)

    if not self.all_targets:
        raise Exception('No suitable C/C++ compiler was found.')

  @property
  def tag(self):
    if builder.options.debug == '1':
      return 'Debug'
    return 'Release'

  def detectSDKs(self):
    if builder.options.mms_path:
      self.mms_root = builder.options.mms_path
    else:
      self.mms_root = ResolveEnvPath('MMSOURCE112', 'mmsource-1.12')
      if not self.mms_root:
        self.mms_root = ResolveEnvPath('MMSOURCE', 'metamod-source')
      if not self.mms_root:
        self.mms_root = ResolveEnvPath('MMSOURCE_DEV', 'metamod-source')
      if not self.mms_root:
        self.mms_root = ResolveEnvPath('MMSOURCE_DEV', 'mmsource-central')

    if not self.mms_root or not os.path.isdir(self.mms_root):
      raise Exception('Could not find a source copy of Metamod:Source')
    self.mms_root = Normalize(self.mms_root)

    if builder.options.sm_path:
      self.sm_root = builder.options.sm_path
    else:
      self.sm_root = ResolveEnvPath('SOURCEMOD112', 'sourcemod-1.12')
      if not self.sm_root:
        self.sm_root = ResolveEnvPath('SOURCEMOD', 'sourcemod')
      if not self.sm_root:
        self.sm_root = ResolveEnvPath('SOURCEMOD_DEV', 'sourcemod')
      if not self.sm_root:
        self.sm_root = ResolveEnvPath('SOURCEMOD_DEV', 'sourcemod-central')

    if not self.sm_root or not os.path.isdir(self.sm_root):
      raise Exception('Could not find a source copy of SourceMod')
    self.sm_root = Normalize(self.sm_root)

  def configure(self):
    
    allowed_archs = ['x86','x86_64']

    if not set(self.target_archs).issubset(allowed_archs):
      raise Exception('Unknown target architecture: {0}'.format(self.target_archs))

    for cxx in self.all_targets:
        self.configure_cxx(cxx)

  def configure_cxx(self, cxx):
    if cxx.family == 'msvc':
      if cxx.version < 1914 and builder.options.generator != 'vs':
        raise Exception(f'Only MSVC 2017 15.7 and later are supported, full C++17 support is required. ({str(cxx.version)} < 1914)')
    elif cxx.family == 'gcc':
      if cxx.version < 'gcc-8':
        raise Exception('Only GCC versions 8 or later are supported, full C++17 support is required.')
    elif cxx.family == 'clang':
      if cxx.version < 'clang-5':
        raise Exception('Only clang versions 5 or later are supported, full C++17 support is required.')

    if cxx.like('gcc'):
      self.configure_gcc(cxx)
    elif cxx.family == 'msvc':
      self.configure_msvc(cxx)

    # Optimization
    if builder.options.opt == '1':
      cxx.defines += ['NDEBUG']

    # Debugging
    if builder.options.debug == '1':
      cxx.defines += ['DEBUG', '_DEBUG']

    # Platform-specifics
    if cxx.target.platform == 'linux':
      self.configure_linux(cxx)
    elif cxx.target.platform == 'mac':
      self.configure_mac(cxx)
    elif cxx.target.platform == 'windows':
      self.configure_windows(cxx)

  def configure_gcc(self, cxx):
    cxx.defines += [
      'stricmp=strcasecmp',
      '_stricmp=strcasecmp',
      '_snprintf=snprintf',
      '_vsnprintf=vsnprintf',
      'HAVE_STDINT_H',
      'GNUC',
    ]
    cxx.cflags += [
      '-pipe',
      '-fno-strict-aliasing',
      '-Wall',
      '-Werror',
      '-Wno-unused',
      '-Wno-switch',
      '-Wno-array-bounds',
      '-fvisibility=hidden',
    ]
  
    if cxx.target.arch in ['x86', 'x86_64']:
      cxx.cflags += ['-msse']

    cxx.cxxflags += [
      '-fno-threadsafe-statics',
      '-Wno-non-virtual-dtor',
      '-Wno-overloaded-virtual',
      '-Wno-register',
      '-fvisibility-inlines-hidden',
      '-std=c++17',
    ]

    have_gcc = cxx.family == 'gcc'
    have_clang = cxx.family == 'clang'

    # Work around errors from smsdk_ext.cpp
    if have_clang:
      cxx.cxxflags += ['-Wno-implicit-exception-spec-mismatch']

    # Work around SDK warnings.
    if cxx.version >= 'clang-10.0' or cxx.version >= 'apple-clang-12.0':
        cxx.cflags += [
            '-Wno-implicit-int-float-conversion',
            '-Wno-tautological-overlap-compare',
        ]

    if have_gcc:
      cxx.cflags += ['-mfpmath=sse']
      cxx.cflags += ['-Wno-maybe-uninitialized']

    if builder.options.opt == '1':
        cxx.cflags += ['-O3']

    # Don't omit the frame pointer.
    cxx.cflags += ['-fno-omit-frame-pointer']

  def configure_msvc(self, cxx):

    if builder.options.debug == '1':
      cxx.cflags += ['/MTd']
      cxx.linkflags += ['/NODEFAULTLIB:libcmt']
    else:
      cxx.cflags += ['/MT']
    cxx.defines += [
      '_CRT_SECURE_NO_DEPRECATE',
      '_CRT_SECURE_NO_WARNINGS',
      '_CRT_NONSTDC_NO_DEPRECATE',
      '_ITERATOR_DEBUG_LEVEL=0',
    ]
    cxx.cflags += [
      '/W3',
    ]
    cxx.cxxflags += [
      '/EHsc',
      '/GR-',
      '/TP',
      '/std:c++17',
    ]
    cxx.linkflags += [
      'kernel32.lib',
      'user32.lib',
      'gdi32.lib',
      'winspool.lib',
      'comdlg32.lib',
      'advapi32.lib',
      'shell32.lib',
      'ole32.lib',
      'oleaut32.lib',
      'uuid.lib',
      'odbc32.lib',
      'odbccp32.lib',
    ]

    if builder.options.opt == '1':
      cxx.cflags += ['/Ox', '/Zo']
      cxx.linkflags += ['/OPT:ICF', '/OPT:REF']

    if builder.options.debug == '1':
      cxx.cflags += ['/Od', '/RTC1']

    # This needs to be after our optimization flags which could otherwise disable it.
    # Don't omit the frame pointer.
    cxx.cflags += ['/Oy-']

  def configure_linux(self, cxx):
    cxx.defines += ['LINUX', '_LINUX', 'POSIX', '_FILE_OFFSET_BITS=64']
    cxx.linkflags += ['-lm']
    if cxx.family == 'gcc':
      cxx.linkflags += ['-static-libgcc']
    elif cxx.family == 'clang':
      cxx.linkflags += ['-lgcc_eh']
    cxx.linkflags += ['-static-libstdc++']

  def configure_mac(self, cxx):
    cxx.defines += ['OSX', '_OSX', 'POSIX', 'KE_ABSOLUTELY_NO_STL']
    cxx.cflags += ['-mmacosx-version-min=10.15']
    cxx.linkflags += [
      '-mmacosx-version-min=10.15',
      '-stdlib=libc++',
      '-lc++',
    ]
    cxx.cxxflags += ['-stdlib=libc++']

  def configure_windows(self, cxx):
    cxx.defines += ['WIN32', '_WINDOWS']
	
  def ConfigureForExtension(self, context, compiler):
    compiler.cxxincludes += [
      os.path.join(context.currentSourcePath),
      os.path.join(context.currentSourcePath, 'sdk'),
      os.path.join(self.sm_root, 'public'),
      os.path.join(self.sm_root, 'public', 'extensions'),
      os.path.join(self.sm_root, 'sourcepawn', 'include'),
      os.path.join(self.sm_root, 'public', 'amtl', 'amtl'),
      os.path.join(self.sm_root, 'public', 'amtl'),
    ]
    return compiler

  def ConfigureForHL2(self, binary):
    compiler = binary.compiler
    SetArchFlags(compiler)

    compiler.cxxincludes += [
      os.path.join(self.mms_root, 'core'),
      os.path.join(self.mms_root, 'core', 'sourcehook'),
    ]

    compiler.defines += ['META_NO_HL2SDK']
    return binary

  def HL2Library(self, context, name):
    binary = context.compiler.Library(name)
    self.ConfigureForExtension(context, binary.compiler)
    return self.ConfigureForHL2(binary)

  def HL2Project(self, context, name):
    project = builder.LibraryProject(name)
    return project

  def HL2Config(self, context, project, name, compiler):
    binary = project.Configure(compiler, name, '{0} - {1}'.format(self.tag, compiler.target.arch))
    self.ConfigureForExtension(context, binary.compiler)
    return self.ConfigureForHL2(binary)

Extension = ExtensionConfig()
Extension.detectSDKs()
Extension.configure()

# This will clone the list and each cxx object as we recurse, preventing child
# scripts from messing up global state.
builder.targets = builder.CloneableList(Extension.all_targets)

# Add additional buildscripts here
BuildScripts = [
  'AMBuilder',
  'PackageScript',
]

builder.Build(BuildScripts, { 'Extension': Extension })