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

def ResolveEnvPath(env, folder):
  if env in os.environ:
    path = os.environ[env]
    if os.path.isdir(path):
      return path
  else:
    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

SdkHelpers = builder.Eval('hl2sdk-manifests/SdkHelpers.ambuild', {
    'Project': 'metamod'
})

class MMSConfig(object):
  def __init__(self):
    self.sdk_manifests = []
    self.sdks = {}
    self.sdk_targets = []
    self.binaries = []
    self.generated_headers = None
    self.versionlib = None
    self.all_targets = []
    self.target_archs = set()

    if builder.options.targets:
      target_archs = builder.options.targets.split(',')
    else:
      target_archs = ['x86']
      if builder.backend == 'amb2':
        target_archs.append('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.')

  def use_auto_versioning(self):
    if builder.backend != 'amb2':
      return False
    return not getattr(builder.options, 'disable_auto_versioning', False)

  def detectProductVersion(self):
    builder.AddConfigureFile('product.version')

    # For OS X dylib versioning
    import re
    with open(os.path.join(builder.sourcePath, 'product.version'), 'r') as fp:
      productContents = fp.read()
    m = re.match(r'(\d+)\.(\d+)\.(\d+).*', productContents)
    if m == None:
      self.productVersion = '1.0.0'
    else:
      major, minor, release = m.groups()
      self.productVersion = '{0}.{1}.{2}'.format(major, minor, release)

  def findSdkPath(self, sdk_name):
    dir_name = 'hl2sdk-{}'.format(sdk_name)
    if builder.options.hl2sdk_root:
      sdk_path = os.path.join(builder.options.hl2sdk_root, dir_name)
      if os.path.exists(sdk_path):
        return sdk_path
    return ResolveEnvPath('HL2SDK{}'.format(sdk_name.upper()), dir_name)

  def shouldIncludeSdk(self, sdk):
    if sdk.get('source2', False) and self.productVersion.startswith('1.'):
      return False
    return True

  def detectSDKs(self):
    sdk_list = [s for s in builder.options.sdks.split(',') if s]
    SdkHelpers.sdk_filter = self.shouldIncludeSdk
    SdkHelpers.find_sdk_path = self.findSdkPath
    SdkHelpers.findSdks(builder, self.all_targets, sdk_list)

    self.sdks = SdkHelpers.sdks
    self.sdk_manifests = SdkHelpers.sdk_manifests
    self.sdk_targets = SdkHelpers.sdk_targets

  def configure(self):
    builder.AddConfigureFile('pushbuild.txt')

    for cxx in self.all_targets:
      if cxx.target.arch not in ['x86', 'x86_64']:
        raise Exception('Unknown target architecture: {0}'.format(arch))

      self.configure_cxx(cxx)

  def configure_cxx(self, cxx):
    if cxx.behavior == 'gcc':
      cxx.defines += [
        'stricmp=strcasecmp',
        '_stricmp=strcasecmp',
        '_snprintf=snprintf',
        '_vsnprintf=vsnprintf',
        'HAVE_STDINT_H',
        'GNUC',
      ]
      cxx.cflags += [
        '-pipe',
        '-fno-strict-aliasing',
        '-Wall',
        '-Werror',
        '-Wno-uninitialized',
        '-Wno-unused',
        '-Wno-switch',
        '-msse',
        '-fPIC',
      ]

      cxx.cxxflags += ['-std=c++17']
      if (cxx.version >= 'gcc-4.0') or cxx.family == 'clang':
        cxx.cflags += ['-fvisibility=hidden']
        cxx.cxxflags += ['-fvisibility-inlines-hidden']
      cxx.cxxflags += [
        '-fno-exceptions',
        '-fno-rtti',
        '-fno-threadsafe-statics',
        '-Wno-non-virtual-dtor',
        '-Wno-overloaded-virtual',
        '-Wno-register',
      ]
      if (cxx.version >= 'gcc-4.7' or cxx.family == 'clang'):
        cxx.cxxflags += ['-Wno-delete-non-virtual-dtor']
      if cxx.family == 'gcc':
        cxx.cflags += ['-mfpmath=sse']
      if cxx.family == 'clang':
        cxx.cxxflags += ['-Wno-implicit-exception-spec-mismatch']
        if cxx.version >= 'clang-3.9' or cxx.version >= 'apple-clang-10.0':
          cxx.cxxflags += ['-Wno-expansion-to-defined']
        if cxx.version >= 'clang-3.6' or cxx.version >= 'apple-clang-7.0':
          cxx.cxxflags += ['-Wno-inconsistent-missing-override']
        if cxx.version >= 'apple-clang-5.1' or cxx.version >= 'clang-3.4':
          cxx.cxxflags += ['-Wno-deprecated-register']
        else:
          cxx.cxxflags += ['-Wno-deprecated']
      
      # 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',
        ]

    elif cxx.like('msvc'):
      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',
      ]
      cxx.cflags += [
        '/W3',
        '/Zi',
        '/std:c++17',
      ]
      cxx.cxxflags += ['/TP']
      
      cxx.linkflags += [
        '/SUBSYSTEM:WINDOWS',
        'kernel32.lib',
        'user32.lib',
        'gdi32.lib',
        'winspool.lib',
        'comdlg32.lib',
        'advapi32.lib',
        'shell32.lib',
        'ole32.lib',
        'oleaut32.lib',
        'uuid.lib',
        'odbc32.lib',
        'odbccp32.lib',
      ]

    # Optimization
    if builder.options.opt == '1':
      cxx.defines += ['NDEBUG']
      if cxx.behavior == 'gcc':
        cxx.cflags += ['-O3']
      elif cxx.behavior == 'msvc':
        cxx.cflags += ['/Ox', '/Zo']
        cxx.linkflags += ['/OPT:ICF', '/OPT:REF']

    # Debugging
    if builder.options.debug == '1':
      cxx.defines += ['DEBUG', '_DEBUG']
      if cxx.behavior == 'gcc':
        cxx.cflags += ['-g3']
      elif cxx.behavior == 'msvc':
        cxx.cflags += ['/Od', '/RTC1']

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

    # Platform-specifics
    if cxx.target.platform == 'linux':
      cxx.defines += ['LINUX', '_LINUX', 'POSIX', '_FILE_OFFSET_BITS=64']
      if cxx.family == 'gcc':
        cxx.linkflags += ['-static-libgcc']
      elif cxx.family == 'clang':
        cxx.linkflags += ['-lgcc_eh']
      cxx.linkflags += ['-static-libstdc++']
    elif cxx.target.platform == 'mac':
      cxx.defines += ['OSX', '_OSX', 'POSIX']

      if cxx.version >= 'apple-clang-10.0':
        cxx.cflags += ['-mmacosx-version-min=10.9', '-stdlib=libc++']
        cxx.linkflags += [
          '-mmacosx-version-min=10.9',
        ]
      else:
        cxx.cflags += ['-mmacosx-version-min=10.5']
        cxx.linkflags += [
          '-mmacosx-version-min=10.5',
        ]

      cxx.linkflags += [
        '-stdlib=libc++',
        '-lc++',
      ]
      cxx.cxxflags += ['-stdlib=libc++']
    elif cxx.target.platform == 'windows':
      cxx.defines += ['WIN32', '_WINDOWS']

    # Finish up.
    cxx.defines += [ 'MMS_USE_VERSIONLIB' ]
    cxx.includes += [
      os.path.join(builder.sourcePath, 'public'),
      os.path.join(builder.sourcePath, 'third_party', 'amtl'),
    ]
    if self.use_auto_versioning():
      cxx.defines += ['MMS_GENERATED_BUILD']
      cxx.includes += [
        os.path.join(builder.buildPath, 'includes'),
        os.path.join(builder.sourcePath, 'versionlib'),
      ]

  def AddVersioning(self, binary):
    if binary.compiler.target.platform == 'windows':
      binary.sources += ['version.rc']
      binary.compiler.rcdefines += [
        'BINARY_NAME="{0}"'.format(binary.outputFile),
        'RC_COMPILE'
      ]
    elif binary.compiler.target.platform == 'mac' and binary.type == 'library':
      binary.compiler.postlink += [
        '-compatibility_version', '1.0.0',
        '-current_version', self.productVersion
      ]
    if self.use_auto_versioning():
      binary.compiler.linkflags += [self.versionlib[binary.compiler.target.arch]]
      binary.compiler.sourcedeps += MMS.generated_headers
    if builder.options.breakpad_dump:
      binary.compiler.symbol_files = 'separate'
    return binary

  def Library(self, cxx, name):
    binary = cxx.Library(name)
    self.AddVersioning(binary)

    if binary.compiler.like('gcc'):
      binary.sources += [
        os.path.join(builder.sourcePath, 'third_party', 'amtl', 'compat', 'stdcxx.cpp')
      ]
    
    return binary

  def Program(self, compiler, name):
    binary = compiler.Program(name)
    compiler = binary.compiler

    self.AddVersioning(binary)
    if '-static-libgcc' in binary.compiler.linkflags:
      binary.compiler.linkflags.remove('-static-libgcc')
    if '-lgcc_eh' in binary.compiler.linkflags:
      binary.compiler.linkflags.remove('-lgcc_eh')
    if binary.compiler.like('gcc'):
      binary.compiler.linkflags += ['-lstdc++']
    return binary
    
  def StaticLibrary(self, cxx, name):
    return cxx.StaticLibrary(name)

  def HL2Library(self, context, compiler, name, sdk):
    binary = self.Library(compiler, name)
    cxx = binary.compiler

    cxx.cxxincludes += [
      os.path.join(context.currentSourcePath),
      os.path.join(context.currentSourcePath, 'sourcehook'),
      os.path.join(context.sourcePath, 'loader'),
    ]

    defines = []
    for other_sdk in self.sdk_manifests:
      cxx.defines += ['SE_{}={}'.format(other_sdk['define'], other_sdk['code'])]

    if sdk['source2']:
      cxx.defines += ['META_IS_SOURCE2']
      binary.sources += [
        os.path.join(sdk['path'], 'public', 'tier0', 'memoverride.cpp'),
        os.path.join(sdk['path'], 'tier1', 'convar.cpp'),
      ]

    SdkHelpers.configureCxx(context, binary, sdk)

    return binary

if getattr(builder, 'target', None) is not None:
    sys.stderr.write("Your output folder was configured for AMBuild 2.1, and Metamod:Source\n")
    sys.stderr.write("is now configured to use AMBuild 2.2. Please remove your output folder\n")
    sys.stderr.write("and reconfigure to continue.\n")
    os._exit(1)

MMS = MMSConfig()
MMS.detectProductVersion()
MMS.detectSDKs()
MMS.configure()

if MMS.use_auto_versioning():
  MMS.generated_headers = builder.Build(
    'support/buildbot/Versioning',
    { 'MMS': MMS }
  )
  MMS.versionlib = builder.Build(
    'versionlib/AMBuildScript',
    { 'MMS': MMS }
  )

BuildScripts = [
  'loader/AMBuilder',
  'core/AMBuilder',
]
if getattr(builder.options, 'enable_tests', False):
    BuildScripts += [
        'core/sourcehook/test/AMBuilder',
    ]

if builder.backend == 'amb2':
  BuildScripts += [
    'support/buildbot/PackageScript',
  ]

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

if builder.options.breakpad_dump:
  builder.Build('support/buildbot/BreakpadSymbols', { 'MMS': MMS })
