core.utils.cachename

import hashlib, os

from core.utils import write_json_file, read_json_file, check_and_create_folder

class CacheName():
	"""
		The file names of the caches can become very long.
		This class checks the length and creates smaller files to not exceed the maximum length for a file system.
	"""

	def filename(name):
		'''
			Checks a file name
			Args:
				filename (string): The file name (full path) to check
			Retruns:
				The new (short enough) file name.
		'''
		if(len(name) > 200):
			basepath = name[:name.rfind('/')];
			filename = name[name.rfind('/')+1:name.rfind('.')];
			ending = name[name.rfind('.')+1:];

			return CacheName._add_index(basepath, filename, ending=ending)
		else:
			return name

	def dirname(name):
		'''
			Checks a directory name
			Args:
				filename (string): The directory name (full path) to check (do not add a file!!!)
			Retruns:
				The new (short enough) directory name.
		'''
		if(len(name) > 150):
			if name[-1] == '/':
				name = name[:-1]

			basepath = name[:name.rfind('/')];
			filename = name[name.rfind('/')+1:]

			return CacheName._add_index(basepath, filename)
		else:
			return name

	def _add_index(basepath, filename, ending=''):
		check_and_create_folder(basepath)

		if '-' in filename:
			middle = filename[:filename.find('-')] + '-' + CacheName._hash(filename)
		else:
			middle = CacheName._hash(filename);

		index_file = os.path.join(basepath, 'index.json')
		if os.path.isfile(index_file):
			index_json = read_json_file(index_file)
		else:
			index_json = {}

		if not middle in index_json:
			index_json[middle] = filename + ( '' if len(ending) < 1 else '.' + ending )
			write_json_file(index_file, index_json)

		return basepath + '/' + middle + ( '' if len(ending) < 1 else '.' + ending )

	def _hash(str):
		return hashlib.sha256(str.encode('utf-8')).hexdigest()

	
	

class CacheName():
	"""
		The file names of the caches can become very long.
		This class checks the length and creates smaller files to not exceed the maximum length for a file system.
	"""

	def filename(name):
		'''
			Checks a file name
			Args:
				filename (string): The file name (full path) to check
			Retruns:
				The new (short enough) file name.
		'''
		if(len(name) > 200):
			basepath = name[:name.rfind('/')];
			filename = name[name.rfind('/')+1:name.rfind('.')];
			ending = name[name.rfind('.')+1:];

			return CacheName._add_index(basepath, filename, ending=ending)
		else:
			return name

	def dirname(name):
		'''
			Checks a directory name
			Args:
				filename (string): The directory name (full path) to check (do not add a file!!!)
			Retruns:
				The new (short enough) directory name.
		'''
		if(len(name) > 150):
			if name[-1] == '/':
				name = name[:-1]

			basepath = name[:name.rfind('/')];
			filename = name[name.rfind('/')+1:]

			return CacheName._add_index(basepath, filename)
		else:
			return name

	def _add_index(basepath, filename, ending=''):
		check_and_create_folder(basepath)

		if '-' in filename:
			middle = filename[:filename.find('-')] + '-' + CacheName._hash(filename)
		else:
			middle = CacheName._hash(filename);

		index_file = os.path.join(basepath, 'index.json')
		if os.path.isfile(index_file):
			index_json = read_json_file(index_file)
		else:
			index_json = {}

		if not middle in index_json:
			index_json[middle] = filename + ( '' if len(ending) < 1 else '.' + ending )
			write_json_file(index_file, index_json)

		return basepath + '/' + middle + ( '' if len(ending) < 1 else '.' + ending )

	def _hash(str):
		return hashlib.sha256(str.encode('utf-8')).hexdigest()