import os
import datalad.api as dl

GITMODULES_FILE = '.gitmodules'


def move_submodule(repo_path, old_path, new_path):
    """
    Move a submodule to a new location.

    Parameters
    ----------
    repo_path: str
    Path to the repository.
    old_path: str
        The old path of the module.
    new_path: str
        The new path of the module.
    """

    os.rename(os.path.join(repo_path, old_path), os.path.join(repo_path, new_path))
    # Öffne die.gitmodules-Datei
    gitmodules_file_path = os.path.join(repo_path, GITMODULES_FILE)
    with open(gitmodules_file_path, 'r') as file:
        lines = [line.strip() for line in file]

    # Ersetzen aller Vorkommnisse von old_path durch new_path
    updated_lines = []
    for line in lines:
        if old_path in line:
            line = line.replace(old_path, new_path)
        updated_lines.append(line)

    # Speichen der aktualisierten.gitmodules-Datei
    with open(gitmodules_file_path, 'w') as file:
        file.write("\n".join(updated_lines))

    with open(repo_path + '/.gitmodules', 'w') as fp:
        fp.writelines(lines)
    dl.save(repo_path, message=f"Move module from {old_path} to {new_path}", dataset=repo_path)