import os, shutil, logging

TAG = 'version_4'

def get(ports, settings, shared):
  if settings.USE_SDL_IMAGE == 2:
    sdl_build = os.path.join(ports.get_build_dir(), 'sdl2')
    assert os.path.exists(sdl_build), 'You must use SDL2 to use SDL2_image'
    ports.fetch_project('sdl2-image', 'https://github.com/emscripten-ports/SDL2_image/archive/' + TAG + '.zip', 'SDL2_image-' + TAG)
    def create():
      shutil.copyfile(os.path.join(ports.get_dir(), 'sdl2-image', 'SDL2_image-' + TAG, 'SDL_image.h'), os.path.join(ports.get_build_dir(), 'sdl2', 'include', 'SDL_image.h'))
      shutil.copyfile(os.path.join(ports.get_dir(), 'sdl2-image', 'SDL2_image-' + TAG, 'SDL_image.h'), os.path.join(ports.get_build_dir(), 'sdl2', 'include', 'SDL2', 'SDL_image.h'))
      srcs = 'IMG.c IMG_bmp.c IMG_gif.c IMG_jpg.c IMG_lbm.c IMG_pcx.c IMG_png.c IMG_pnm.c IMG_tga.c IMG_tif.c IMG_xcf.c IMG_xpm.c IMG_xv.c IMG_webp.c IMG_ImageIO.m'.split(' ')
      commands = []
      o_s = []
      defs = []

      for fmt in settings.SDL2_IMAGE_FORMATS:
        defs.append('-DLOAD_' + fmt.upper())

      if 'png' in settings.SDL2_IMAGE_FORMATS:
        defs += ['-s', 'USE_LIBPNG=1']

      for src in srcs:
        o = os.path.join(ports.get_build_dir(), 'sdl2-image', src + '.o')
        commands.append([shared.PYTHON, shared.EMCC, os.path.join(ports.get_dir(), 'sdl2-image', 'SDL2_image-' + TAG, src), '-O2', '-s', 'USE_SDL=2', '-o', o, '-w'] + defs)
        o_s.append(o)
      shared.safe_ensure_dirs(os.path.dirname(o_s[0]))
      ports.run_commands(commands)
      final = os.path.join(ports.get_build_dir(), 'sdl2-image', 'libsdl2_image.bc')
      shared.Building.link(o_s, final)
      return final

    settings.SDL2_IMAGE_FORMATS.sort()
    formats = '-'.join(settings.SDL2_IMAGE_FORMATS)

    name = 'sdl2-image'
    if formats != '':
        name = name + '-' + formats

    return [shared.Cache.get(name, create, what='port')]
  else:
    return []

def process_dependencies(settings):
  if settings.USE_SDL_IMAGE == 2:
    settings.USE_SDL = 2
  if 'png' in settings.SDL2_IMAGE_FORMATS:
    settings.USE_LIBPNG = 1

def process_args(ports, args, settings, shared):
  if settings.USE_SDL_IMAGE == 2:
    get(ports, settings, shared)
  return args

def show():
  return 'SDL2_image (USE_SDL_IMAGE=2; zlib license)'

