from file_handlers import FileHandler

class VersionRepository():

    def __init__(self, file):
        self.file = file
        self.file_handler = None
        self.version_list = None
        self.is_snapshot = None
    
    def load_file(self):
        self.file_handler = FileHandler.from_file_path(self.file)
        return self.file_handler

    def write_file(self, version_string):
        if self.file_handler is None:
            raise Exception('Version was not created by load_file method.')
        if self.version_list is None or self.is_snapshot is None:
            raise Exception('Version or is_snapshot attribute not set.')
        else:
            self.file_handler.write(version_string)
    
    def parse_file(self, file_handler):
        version_list, is_snapshot = file_handler.parse()
        return version_list, is_snapshot

    @classmethod
    def get(cls, file):
        inst = cls(file)

        file_handler = inst.load_file()
        version_list, is_snapshot = inst.parse_file(file_handler)

        inst.version_list = version_list
        inst.is_snapshot = is_snapshot
        inst.file_handler = file_handler

        return inst