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from __future__ import print_function
import httplib2
import inspect
import os

from apiclient import discovery
from apiclient import errors
import oauth2client
from oauth2client import client
from oauth2client import tools


    

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# If modifying these scopes, delete your previously saved credentials
# at ~/.credentials/drive-python-quickstart.json
SCOPES = 'https://www.googleapis.com/auth/drive.metadata.readonly https://www.googleapis.com/auth/drive.readonly'
CLIENT_SECRET_FILE = 'client_secret.json'
APPLICATION_NAME = 'Drive API Python Quickstart'


    

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def get_credentials():
    """Gets valid user credentials from storage.
    Must run google_api_credentials.py from the command line first to set up credentials.
    Returns:
        Credentials, the obtained credential.
    """
    credential_path = '../temp/.credentials/drive-python-quickstart.json'
    store = oauth2client.file.Storage(credential_path)
    return store.get()


    

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def get_children_ids(service, folder_id):
    """Print files belonging to a folder.

    Args:
    service: Drive API service instance.
    folder_id: ID of the folder to print files from.
    """
    page_token = None
    all_children = []
    while True:
        try:
            param = {}
            if page_token:
                param['pageToken'] = page_token
            children = service.children().list(folderId=folder_id, **param).execute()

            child_items = children.get('items', [])
            all_children.extend(child_items)
            page_token = children.get('nextPageToken')
            if not page_token:
                break
        except (errors.HttpError, error):
            print('An error occurred: %s' % error)
            break
    return all_children


    

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def get_file_info(service, file_id):
    try:
        file = service.files().get(fileId=file_id).execute()
        return [file["originalFilename"], file_id, file["fileSize"]]
    except (errors.HttpError, error):
        print('An error occurred: %s' % error)


    

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def list_files(folder_id):
    credentials = get_credentials()
    http = credentials.authorize(httplib2.Http())
    service = discovery.build('drive', 'v2', http=http)
    
    listing = []

    children = get_children_ids(service, folder_id)

    for child in children:
        entry = get_file_info(service, child["id"])
        listing.append(entry)
        print(",".join(entry))
    return listing


    

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def list_all_files(folders):
    for folder_id in folders:
        results = list_files(folder_id)
        results = sorted(results, key=lambda entry:entry[0])

        with open("folder_" + folder_id + ".csv", "w") as drive_files:
            for entry in results:
                print(",".join(entry), file=drive_files)


    

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folder_ids = [
    "0B8WcbXogHveganEwc0ZCelN2Wmc",
    "0B8WcbXogHvegWU1JVTJzSG1FSjQ",
    "0B8WcbXogHvegOW1yVXVBeGItSzQ",
    "0B8WcbXogHvegb2JZQmJwRnZzMnc",
    "0B8WcbXogHvegZTA1dFU4MXptM1k",
    "0B8WcbXogHvegRWFRNVBJUXZnczg",
    "0B8WcbXogHvegMnIxOHR0ME1lUlE",
    "0B8WcbXogHvegbnF2U1lQbUFCQW8",
    "0B8WcbXogHvegTHNmX3pWMnZrVnc",
    "0B8WcbXogHvegS0NMLTFyckFwYnM",
    "0B8WcbXogHvegeVZPLW1reDlRV0E",
    "0B8WcbXogHvegYjVCVkQ4ZXV4aU0"
]
list_all_files(folder_ids)


    

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