extends Node


# Get hold of the brushes, including random brushes (subdirectories and % files
# in them, non % files get loaded independently.) nyaaa
# Returns a list of [
# [non random single png files in the root subdir],
# {
# map of subdirectories to lists of files for
# the randomised brush - if a directory contains no
# randomised files then it is not included in this.
# },
# {
# map of subdirectories to lists of files inside of them
# that are not for randomised brushes.
# }
# ]
# The separation of nonrandomised and randomised files
# in subdirectories allows different XDG_DATA_DIR overriding
# for each nyaa.
#
# Returns null if the directory gave an error opening.
#
func get_brush_files_from_directory(directory: String):  # -> Array
	var base_png_files := []  # list of files in the base directory
	var subdirectories := []  # list of subdirectories to process.

	var randomised_subdir_files_map: Dictionary = {}
	var nonrandomised_subdir_files_map: Dictionary = {}

	var main_directory := DirAccess.open(directory)
	if DirAccess.get_open_error() != OK:
		return null

	# Build first the list of base png files and all subdirectories to
	# scan later (skip navigational . and ..)
	main_directory.list_dir_begin()
	var fname: String = main_directory.get_next()
	while fname != "":
		if main_directory.current_is_dir():
			subdirectories.append(fname)
		else:  # Filter for pngs
			if fname.get_extension().to_lower() == "png":
				base_png_files.append(fname)

		# go to next
		fname = main_directory.get_next()
	main_directory.list_dir_end()

	# Now we iterate over subdirectories!
	for subdirectory in subdirectories:
		# Holds names of files that make this
		# a component of a randomised brush ^.^
		var randomised_files := []

		# Non-randomise-indicated image files
		var non_randomised_files := []

		var the_directory := DirAccess.open(directory.path_join(subdirectory))
		the_directory.include_navigational = true
		the_directory.list_dir_begin()
		var curr_file := the_directory.get_next()

		while curr_file != "":
			# only do stuff if we are actually dealing with a file
			# and png one at that nya
			if !the_directory.current_is_dir() and curr_file.get_extension().to_lower() == "png":
				# if we are a random element, add
				if "~" in curr_file:
					randomised_files.append(curr_file)
				else:
					non_randomised_files.append(curr_file)
			curr_file = the_directory.get_next()

		the_directory.list_dir_end()

		# Add these to the maps nyaa
		if len(randomised_files) > 0:
			randomised_subdir_files_map[subdirectory] = randomised_files
		if len(non_randomised_files) > 0:
			nonrandomised_subdir_files_map[subdirectory] = non_randomised_files
	# We are done generating the maps!
	return [base_png_files, randomised_subdir_files_map, nonrandomised_subdir_files_map]


# Add a randomised brush from the given list of files as a source.
# The tooltip name is what shows up on the tooltip
# and is probably in this case the name of the containing
# randomised directory.
func add_randomised_brush(fpaths: Array, tooltip_name: String) -> void:
	# Attempt to load the images from the file paths.
	var loaded_images: Array = []
	for filen in fpaths:
		var image := Image.new()
		var err := image.load(filen)
		if err == OK:
			image.convert(Image.FORMAT_RGBA8)
			loaded_images.append(image)

	# If any images were successfully loaded, then
	# we create the randomised brush button, copied
	# from find_brushes.

	if len(loaded_images) > 0:  # actually have images
		# to use.
		Brushes.add_file_brush(loaded_images, tooltip_name)


# Add a plain brush from the given path to the list of brushes.
# Taken, again, from find_brushes
func add_plain_brush(path: String, tooltip_name: String) -> void:
	var image := Image.new()
	var err := image.load(path)
	if err != OK:
		return
	# do the standard conversion thing...
	image.convert(Image.FORMAT_RGBA8)
	Brushes.add_file_brush([image], tooltip_name)


# Import brushes, in priority order, from the paths in question in priority order
# i.e. with an override system
# We use a very particular override system here where, for randomised brushes
# the directories containing them get overridden, but for nonrandomised files
# (including in directories containing randomised components too), the override
# is on a file-by-file basis nyaaaa ^.^
func import_brushes(priority_ordered_search_path: Array) -> void:
	# Maps for files in the base directory (name : true)
	var processed_basedir_paths: Dictionary = {}
	var randomised_brush_subdirectories: Dictionary = {}
	# Map from a subdirectory to a map similar to processed_basedir_files
	# i.e. once a filename has been dealt with, set it to true.
	var processed_subdir_paths: Dictionary = {}

	# Sets of results of get_brush_files_from_directory
	var all_available_paths: Array = []
	for directory in priority_ordered_search_path:
		all_available_paths.append(get_brush_files_from_directory(directory))

	# Now to process. Note these are in order of the
	# priority, as intended nyaa :)
	for i in range(len(all_available_paths)):
		var available_brush_file_information = all_available_paths[i]
		var current_main_directory: String = priority_ordered_search_path[i]
		if available_brush_file_information != null:
			# The brush files in the main directory
			var main_directory_file_paths: Array = available_brush_file_information[0]
			# The subdirectory/list-of-randomised-brush-files
			# map for this directory
			var randomised_brush_subdirectory_map: Dictionary = available_brush_file_information[1]
			# Map for subdirectories to non-randomised-brush files nyaa
			var nonrandomised_brush_subdir_map: Dictionary = available_brush_file_information[2]

			# Iterate over components and do stuff with them! nyaa
			# first for the main directory path...
			for subfile in main_directory_file_paths:
				if not (subfile in processed_basedir_paths):
					add_plain_brush(
						current_main_directory.path_join(subfile), subfile.get_basename()
					)
					processed_basedir_paths[subfile] = true

			# Iterate over the randomised brush files nyaa
			for randomised_subdir in randomised_brush_subdirectory_map:
				if not (randomised_subdir in randomised_brush_subdirectories):
					var full_paths := []
					# glue the proper path onto the single file names in the
					# random brush directory data system, so they can be
					# opened nya
					for non_extended_path in randomised_brush_subdirectory_map[randomised_subdir]:
						full_paths.append(
							current_main_directory.path_join(randomised_subdir).path_join(
								non_extended_path
							)
						)
					# Now load!
					add_randomised_brush(full_paths, randomised_subdir)
					# and mark that we are done in the overall map ^.^
					randomised_brush_subdirectories[randomised_subdir] = true
			# Now to iterate over the nonrandom brush files inside directories
			for nonrandomised_subdir in nonrandomised_brush_subdir_map:
				# initialise the set-map for this one if not already present :)
				if not (nonrandomised_subdir in processed_subdir_paths):
					processed_subdir_paths[nonrandomised_subdir] = {}
				# Get the paths within this subdirectory to check if they are
				# processed or not and if not, then process them.
				var relpaths_of_nonrandom_brushes: Array = nonrandomised_brush_subdir_map[nonrandomised_subdir]
				for relative_path in relpaths_of_nonrandom_brushes:
					if not (relative_path in processed_subdir_paths[nonrandomised_subdir]):
						# We are not yet processed
						var full_path: String = (
							current_main_directory
							. path_join(nonrandomised_subdir)
							. path_join(relative_path)
						)
						# Add the path with the tooltip including the directory
						add_plain_brush(
							full_path, nonrandomised_subdir.path_join(relative_path).get_basename()
						)
						# Mark this as a processed relpath
						processed_subdir_paths[nonrandomised_subdir][relative_path] = true


func import_patterns(priority_ordered_search_path: Array) -> void:
	for path in priority_ordered_search_path:
		var pattern_list := []
		var dir := DirAccess.open(path)
		if not is_instance_valid(dir):
			continue
		dir.list_dir_begin()
		var curr_file := dir.get_next()
		while curr_file != "":
			if curr_file.get_extension().to_lower() == "png":
				pattern_list.append(curr_file)
			curr_file = dir.get_next()
		dir.list_dir_end()

		for pattern in pattern_list:
			var image := Image.new()
			var err := image.load(path.path_join(pattern))
			if err == OK:
				image.convert(Image.FORMAT_RGBA8)
				var tooltip_name = pattern.get_basename()
				Global.patterns_popup.add(image, tooltip_name)
