import pathlib
import os
import sys

@VARS@

image     = Gimp.get_images()[0]
procedure = Gimp.get_pdb().lookup_procedure("file-bmp-export")
if procedure is None:
  sys.exit(os.EX_OK)
config    = procedure.create_config()


def export_scaled_img(image, target_height, export_path):
  img    = image.duplicate()
  img.undo_disable()
  layer  = img.flatten()
  width  = layer.get_width()
  height = layer.get_height()
  target_width  = int(target_height / height * width)
  layer.scale(target_width, target_height, False)
  img.resize(target_width, target_height, 0, 0)

  config.set_property("image", img)
  config.set_property("file", Gio.file_new_for_path(export_path))
  retval = procedure.run(config)
  if retval.index(0) != Gimp.PDBStatusType.SUCCESS:
    sys.exit(70)
  img.delete()


# See https://gitlab.gnome.org/GNOME/gimp-data/-/issues/5
def export_blurred_img(image, target_height, export_path):
  img    = image.duplicate()
  img.undo_disable()
  layer  = img.flatten()
  width  = layer.get_width()
  height = layer.get_height()
  target_width  = int(target_height / height * width)
  layer.scale(target_width, target_height, False)
  img.resize(target_width, target_height, 0, 0)

  filter = Gimp.DrawableFilter.new(layer, "gegl:gaussian-blur", "")
  filter_config = filter.get_config()
  filter_config.set_property('std-dev-x', 27.5)
  filter_config.set_property('std-dev-y', 27.5)
  layer.merge_filter(filter)

  filter = Gimp.DrawableFilter.new(layer, "gegl:noise-hsv", "")
  filter_config = filter.get_config()
  filter_config.set_property('hue-distance', 2.0)
  filter_config.set_property('saturation-distance', 0.002)
  filter_config.set_property('value-distance', 0.015)
  layer.merge_filter(filter)

  config.set_property("image", img)
  config.set_property("file", Gio.file_new_for_path(export_path))
  retval = procedure.run(config)
  if retval.index(0) != Gimp.PDBStatusType.SUCCESS:
    sys.exit(70)
  img.delete()


def set_only_visible(image, drawable):
  parent = drawable.get_parent()
  if parent is None:
    children = image.get_layers()
  else:
    children = parent.get_children()
  for child in children:
    child.set_visible(child == drawable)
  if parent is not None:
    set_only_visible(parent)


def export_cropped_img(image, target_width, target_height, export_path):
  img        = image.duplicate()
  img.undo_disable()
  w          = img.get_width()
  h          = img.get_height()
  if layer_windows is not None:
    drawable = img.get_layer_by_name(layer_windows)
    if drawable is None:
      sys.stderr.write(f'ERROR: unknown drawable name "{layer_windows}".\n')
      sys.stderr.write( '       Please verify variable `layer_windows` in gimp-data/images/gimp-splash.crop\n')
      sys.exit(70)
    set_only_visible(img, drawable)
  drawable = img.flatten()
  new_width = target_height / h * w
  img.scale(new_width, target_height)
  img.resize(new_width, target_height, 0, 0)
  drawable.resize_to_image_size()
  offx = new_width * offset_percent
  img.crop(target_width, target_height, offx, 0)

  config.set_property("image", img)
  config.set_property("file", Gio.file_new_for_path(export_path))
  retval = procedure.run(config)
  if retval.index(0) != Gimp.PDBStatusType.SUCCESS:
    sys.exit(70)
  img.delete()


image.undo_disable()

# Safe (taller than necessary) heights derived from: https://jrsoftware.org/ishelp/index.php?topic=setup_wizardimagefile
export_scaled_img(image, 314, 'build/windows/installer/installsplash_top.scale-100.bmp')
export_scaled_img(image, 386, 'build/windows/installer/installsplash_top.scale-125.bmp')
export_scaled_img(image, 459, 'build/windows/installer/installsplash_top.scale-150.bmp')
export_scaled_img(image, 556, 'build/windows/installer/installsplash_top.scale-175.bmp')
export_scaled_img(image, 604, 'build/windows/installer/installsplash_top.scale-200.bmp')
export_scaled_img(image, 700, 'build/windows/installer/installsplash_top.scale-225.bmp')
export_scaled_img(image, 797, 'build/windows/installer/installsplash_top.scale-250.bmp')
export_blurred_img(image, 314, 'build/windows/installer/installsplash_bottom.bmp')

# Avoid the images being re-generated at each build.
pathlib.Path('gimp-data/images/stamp-installsplash.bmp').touch()

# Needed by the installer .iss script to maintain the splash aspect ratio: https://gitlab.gnome.org/GNOME/gimp/-/issues/11677
with open('build/windows/installer/splash-dimensions.h', 'w') as f:
  f.write('#define GIMP_SPLASH_WIDTH  {}\n'.format(image.get_width()))
  f.write('#define GIMP_SPLASH_HEIGHT {}\n'.format(image.get_height()))


# https://jrsoftware.org/ishelp/index.php?topic=setup_wizardimagefile
export_cropped_img(image, 164, 314, 'build/windows/installer/install-end.scale-100.bmp')
export_cropped_img(image, 202, 386, 'build/windows/installer/install-end.scale-125.bmp')
export_cropped_img(image, 240, 459, 'build/windows/installer/install-end.scale-150.bmp')
export_cropped_img(image, 290, 556, 'build/windows/installer/install-end.scale-175.bmp')
export_cropped_img(image, 315, 604, 'build/windows/installer/install-end.scale-200.bmp')
export_cropped_img(image, 366, 700, 'build/windows/installer/install-end.scale-225.bmp')
export_cropped_img(image, 416, 797, 'build/windows/installer/install-end.scale-250.bmp')

# Avoid the images being re-generated at each build.
pathlib.Path('gimp-data/images/stamp-install-end.bmp').touch()