#!/usr/bin/python2.4
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"""Simple DirectMedia Layer tool for SCons.

This tool sets up an environment to use the SDL library.
"""

import os
import sys
import SCons.Script


def _HermeticSDL(env):
  """Set things up if sdl is hermetically setup somewhere."""

  if sys.platform in ['win32', 'cygwin']:
    env.SetDefault(
        SDL_DIR='$SDL_HERMETIC_WINDOWS_DIR',
        SDL_CPPPATH=['$SDL_DIR/include'],
        SDL_LIBPATH=['$SDL_DIR/lib'],
        SDL_LIBS=['SDL', 'SDLmain'],
        SDL_FRAMEWORKPATH=[],
        SDL_FRAMEWORKS=[],
    )
  elif sys.platform in ['darwin']:
    env.SetDefault(
        SDL_DIR='$SDL_HERMETIC_MAC_DIR',
        SDL_CPPPATH=[
            '$SDL_DIR/SDL.framework/Headers',
        ],
        SDL_LIBPATH=[],
        SDL_LIBS=[],
        SDL_FRAMEWORKPATH=['$SDL_DIR'],
        SDL_FRAMEWORKS=['SDL', 'Cocoa'],
    )
  elif sys.platform in ['linux', 'linux2', 'posix']:
    env.SetDefault(
        SDL_DIR='$SDL_HERMETIC_LINUX_DIR',
        SDL_CPPPATH='$SDL_DIR/include',
        SDL_LIBPATH='$SDL_DIR/lib',
        SDL_LIBS=['SDL', 'SDLmain'],
        SDL_FRAMEWORKPATH=[],
        SDL_FRAMEWORKS=[],
    )
  else:
    env.SetDefault(
        SDL_VALIDATE_PATHS=[
            ('unsupported_platform',
             ('Not supported on this platform.')),
        ],
        SDL_IS_MISSING=True,
    )

  if not env.get('SDL_IS_MISSING', False):
    env.SetDefault(
        SDL_VALIDATE_PATHS=[
            ('$SDL_DIR',
             ('You are missing a hermetic copy of SDL...')),
        ],
    )


def _LocalSDL(env):
  """Set things up if sdl is locally installed."""

  if sys.platform in ['win32', 'cygwin']:
    env.SetDefault(
        SDL_DIR='c:/SDL-1.2.13',
        SDL_CPPPATH='$SDL_DIR/include',
        SDL_LIBPATH='$SDL_DIR/lib',
        SDL_LIBS=['SDL', 'SDLmain'],
        SDL_FRAMEWORKPATH=[],
        SDL_FRAMEWORKS=[],
        SDL_VALIDATE_PATHS=[
            ('$SDL_DIR',
             ('You are missing SDL-1.2.13 on your system.',
              'It was supposed to be in: ${SDL_DIR}',
              'You can download it from:',
              '  http://www.libsdl.org/download-1.2.php')),
        ],
    )
  elif sys.platform in ['darwin']:
    env.SetDefault(
        SDL_CPPPATH=['/Library/Frameworks/SDL.framework/Headers'],
        SDL_LIBPATH=[],
        SDL_LIBS=[],
        SDL_FRAMEWORKPATH=[],
        SDL_FRAMEWORKS=['SDL', 'Cocoa'],
        SDL_VALIDATE_PATHS=[
            ('/Library/Frameworks/SDL.framework/SDL',
             ('You are missing the SDL framework on your system.',
              'You can download it from:',
              'http://www.libsdl.org/download-1.2.php')),
        ],
    )
  elif sys.platform in ['linux', 'linux2', 'posix']:
    env.SetDefault(
        SDL_CPPPATH='/usr/include/SDL',
        SDL_LIBPATH='/usr/lib',
        SDL_LIBS=['SDL', 'SDLmain'],
        SDL_FRAMEWORKPATH=[],
        SDL_FRAMEWORKS=[],
        SDL_VALIDATE_PATHS=[
            ('/usr/lib/libSDL.so',
             ('You are missing SDL on your system.',
              'Run sudo apt-get install libsdl1.2-dev.')),
        ],
    )


def generate(env):
  # NOTE: SCons requires the use of this name, which fails gpylint.
  """SCons entry point for this tool."""

  # Allow the hermetic copy to be disabled on the command line.
  sdl_mode = SCons.Script.ARGUMENTS.get('sdl', 'hermetic')
  if sdl_mode == 'local':
    _LocalSDL(env)
  elif sdl_mode == 'hermetic':
    _HermeticSDL(env)
  elif sdl_mode == 'none':
    return
  else:
    assert False

  validate_paths = env['SDL_VALIDATE_PATHS']

  if not validate_paths:
    sys.stderr.write('*' * 77 + '\n')
    sys.stderr.write('ERROR - SDL not supported on this platform.\n')
    sys.stderr.write('*' * 77 + '\n')
    sys.exit(-1)

  for i in validate_paths:
    if not os.path.exists(env.subst(i[0])):
      sys.stderr.write('*' * 77 + '\n')
      for j in i[1]:
        sys.stderr.write(env.subst(j) + '\n')
      sys.stderr.write('*' * 77 + '\n')
      sys.exit(-1)

  env.Append(
      CPPPATH=['$SDL_CPPPATH'],
      LIBPATH=['$SDL_LIBPATH'],
      LIBS=['$SDL_LIBS'],
      FRAMEWORKPATH=['$SDL_FRAMEWORKPATH'],
      FRAMEWORKS=['$SDL_FRAMEWORKS'],
  )