import os
import shutil
from pathlib import Path

"""Cleans all django-created files and compiled python. Used by the
pre-run.sh script which cleans and initialises everything before
running:
python databaseReset.py reset

Downloaded (June 2020) from:
https://groups.google.com/forum/#!topic/django-users/C8Q7CTpcChc
"""

# from https://groups.google.com/forum/#!topic/django-users/C8Q7CTpcChc
# Just put it in the folder where manage.py file is and run it.

folders = []
base_dir = os.path.dirname(os.path.realpath(__file__))


def get_directory_list():
    global folders
    global base_dir

    for root, d_names, f_names in os.walk(base_dir):
        for name in d_names:
            folders.append(os.path.join(root, name))
    folders = sorted(folders)
    
    return folders


def delete_pycache():
    global folders 

    for folder in folders:
        if folder.endswith("__pycache__"):
            shutil.rmtree(folder)

    print("All __pycache__ files deleted.")
    return None


def delete_migrations():
    global folders

    for folder in folders:
        if folder.endswith("migrations"):
            for item in os.listdir(folder):
                if not item.endswith("__init__.py"):
                    fullitem = Path(folder, item)
                    if fullitem.is_dir():
                        print(f"__ directory {item} in {folder} not deleted")
                    else:
                        os.remove(os.path.join(folder, item))

    print("All migration files deleted.")
    return None


def delete_sqlite3():
    global base_dir
    
    db_file = os.path.join(base_dir, "troggle.sqlite")
    #print("troggle.sqlite: {}".format(db_file))
    if os.path.exists(db_file):
        try:
            os.remove(db_file)
            print(f"\n>>> troggle.sqlite: {db_file} DELETED\n")
        except:
            print(f"troggle.sqlite: {db_file} NOT deleted")


def main():
    global folders
    print(f"base directory used: {base_dir}")


    try: 
        get_directory_list()
        delete_pycache()
        delete_migrations()
        delete_sqlite3()
        print("All cleanup operations performed successfully.")
        
    except Exception:
        print("There was some error! Aaargh. \n")
        raise


if __name__ == "__main__":
    main()