#
#     Sam Hadow - Huffman-py
#     Copyright (C) 2023
#
#     This program is free software: you can redistribute it and/or modify
#     it under the terms of the GNU General Public License as published by
#     the Free Software Foundation, either version 3 of the License, or
#     (at your option) any later version.
#
#     This program is distributed in the hope that it will be useful,
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#     GNU General Public License for more details.
#
#     You should have received a copy of the GNU General Public License
#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
def calculate_code(node, value = '', the_codes = None):
        # Create code Dict if it doesn't exist yet (before recursion)
        if the_codes == None:
            the_codes = dict()

            # handle the case with a single node (0 as default value)
            if(not node.left and not node.right):
                the_codes[node.char] = "0"
                return the_codes

        # actual node code
        newValue = value + str(node.code)

        if(node.left):
            calculate_code(node.left, newValue, the_codes)
        if(node.right):
            calculate_code(node.right, newValue, the_codes)

        if(not node.left and not node.right):
            the_codes[node.char] = newValue

        return the_codes