from gapi.api import API
import re
APPLICATION_NAME = "Google Calendar API Python"
def is_folder(element):
    return element['mimeType'] == 'application/vnd.google-apps.folder'
def split_path(path,rev=False):

    s = re.findall(r'(?:^/|[^/\x00]+)',path)
    if rev:
        return s[::-1]
    else:
        return s

class drive_api(API):
    def __init__(
            self,
            app_name,
            client_secret_file,
            credentials_dir,
            scopes = 'https://www.googleapis.com/auth/drive',
            version = 'v3',
        ):
        super().__init__('drive',scopes,app_name,client_secret_file,credentials_dir,version)
        self.filesystem = {'/':{}}
        root_meta = self.service.files().get(fileId='root').execute()
        del root_meta['kind']
        self.filesystem['/'][0] = root_meta

    def get_file_by_path(self,path):
        path = split_path(path)
        parent = self.filesystem
        for sub in path[:-1]:
            try:
                parent = parent[sub]
            except KeyError:
                self.fill_in(parent)
                parent = parent[sub]
        end = path[-1]
        for _try in range(2):
            try:
                return parent[end]
            except KeyError:
                if _try == 0:
                    self.fill_in(parent)
                else:
                    raise FileNotFoundError()

    # finds all files and folders from a parent
    def fill_in(self,parent):
        parent_id = parent[0]['id']
        child_list = self.list_children(parent_id)
        for child in child_list:
            del child['kind']
            name = child.pop('name')
            if is_folder(child):
                parent[name] = {}
                parent[name][0] = child
            else:
                parent[name] = child

    def list_children(self,parent_id):
        page_token = None
        first = True
        while page_token or first:
            first = False
            response = self.service.files().list(q = "'{}' in parents".format(parent_id),pageToken=page_token).execute()
            page_token = response.get('nextPageToken',None)
            for file in response['files']:
                yield file

if __name__ == "__main__":
    my_api = drive_api(APPLICATION_NAME,r'..\test\drive\client_secret.json',r'..\test\drive')
    service = my_api.service