#!/usr/bin/python
# coding: utf-8
# From Youtube samples : https://raw.githubusercontent.com/youtube/api-samples/master/python/upload_video.py  # noqa

import httplib
import httplib2
import random
import time
import copy
import json
from os.path import splitext, basename, exists
import google.oauth2.credentials
import datetime
import pytz
import logging
from tzlocal import get_localzone

from googleapiclient.discovery import build
from googleapiclient.errors import HttpError
from googleapiclient.http import MediaFileUpload
from google_auth_oauthlib.flow import InstalledAppFlow

import utils

logging.basicConfig(format='%(asctime)s %(message)s', level=logging.INFO)


# Explicitly tell the underlying HTTP transport library not to retry, since
# we are handling retry logic ourselves.
httplib2.RETRIES = 1

# Maximum number of times to retry before giving up.
MAX_RETRIES = 10

# Youtube retriables cases
RETRIABLE_EXCEPTIONS = (
    IOError,
    httplib2.HttpLib2Error,
    httplib.NotConnected,
    httplib.IncompleteRead,
    httplib.ImproperConnectionState,
    httplib.CannotSendRequest,
    httplib.CannotSendHeader,
    httplib.ResponseNotReady,
    httplib.BadStatusLine,
)

RETRIABLE_STATUS_CODES = [500, 502, 503, 504]


CLIENT_SECRETS_FILE = 'youtube_secret.json'
CREDENTIALS_PATH = ".youtube_credentials.json"
SCOPES = ['https://www.googleapis.com/auth/youtube.upload']
API_SERVICE_NAME = 'youtube'
API_VERSION = 'v3'


# Authorize the request and store authorization credentials.
def get_authenticated_service():
    flow = InstalledAppFlow.from_client_secrets_file(
        CLIENT_SECRETS_FILE, SCOPES)
    if exists(CREDENTIALS_PATH):
        with open(CREDENTIALS_PATH, 'r') as f:
            credential_params = json.load(f)
            credentials = google.oauth2.credentials.Credentials(
                credential_params["token"],
                refresh_token=credential_params["_refresh_token"],
                token_uri=credential_params["_token_uri"],
                client_id=credential_params["_client_id"],
                client_secret=credential_params["_client_secret"]
            )
    else:
        credentials = flow.run_local_server()
        with open(CREDENTIALS_PATH, 'w') as f:
            p = copy.deepcopy(vars(credentials))
            del p["expiry"]
            json.dump(p, f)
    return build(API_SERVICE_NAME, API_VERSION, credentials=credentials,  cache_discovery=False)


def initialize_upload(youtube, options):
    path = options.get('--file')
    tags = None
    if options.get('--tags'):
        tags = options.get('--tags').split(',')

    category = None
    if options.get('--category'):
        category = utils.getCategory(options.get('--category'), 'youtube')

    language = None
    if options.get('--language'):
        language = utils.getLanguage(options.get('--language'), "youtube")

    license = None
    if options.get('--cca'):
        license = "creativeCommon"

    body = {
        "snippet": {
            "title": options.get('--name') or splitext(basename(path))[0],
            "description": options.get('--description') or "default description",
            "tags": tags,
            # if no category, set default to 1 (Films)
            "categoryId": str(category or 1),
            "defaultAudioLanguage": str(language or 'en')
        },
        "status": {
            "privacyStatus": str(options.get('--privacy') or "private"),
            "license": str(license or "youtube"),
        }
    }

    if options.get('--publishAt'):
        # Youtube needs microsecond and the local timezone from ISO 8601
        publishAt = options.get('--publishAt') + ".000001"
        publishAt = datetime.datetime.strptime(publishAt, '%Y-%m-%dT%H:%M:%S.%f')
        tz = get_localzone()
        tz = pytz.timezone(str(tz))
        publishAt = tz.localize(publishAt).isoformat()
        body['status']['publishAt'] = str(publishAt)

    # Call the API's videos.insert method to create and upload the video.
    insert_request = youtube.videos().insert(
        part=','.join(body.keys()),
        body=body,
        media_body=MediaFileUpload(path, chunksize=-1, resumable=True)
    )
    resumable_upload(insert_request)


# This method implements an exponential backoff strategy to resume a
# failed upload.
def resumable_upload(request):
    response = None
    error = None
    retry = 0
    while response is None:
        try:
            logging.info('Youtube : Uploading file...')
            status, response = request.next_chunk()
            if response is not None:
                if 'id' in response:
                    template = ('Youtube : Video was successfully '
                                'uploaded.\n'
                                'Watch it at https://youtu.be/%s (post-encoding could take some time)')
                    logging.info(template % response['id'])
                else:
                    template = ('Youtube : The upload failed with an '
                                'unexpected response: %s')
                    logging.error(template % response)
                    exit(1)
        except HttpError as e:
            if e.resp.status in RETRIABLE_STATUS_CODES:
                template = 'Youtube : A retriable HTTP error %d occurred:\n%s'
                error = template % (e.resp.status, e.content)
            else:
                raise
        except RETRIABLE_EXCEPTIONS as e:
            error = 'Youtube : A retriable error occurred: %s' % e

    if error is not None:
        logging.warning(error)
        retry += 1
        if retry > MAX_RETRIES:
            logging.error('Youtube : No longer attempting to retry.')
            exit(1)

        max_sleep = 2 ** retry
        sleep_seconds = random.random() * max_sleep
        logging.warning('Youtube : Sleeping %f seconds and then retrying...'
              % sleep_seconds)
        time.sleep(sleep_seconds)


def run(options):
    youtube = get_authenticated_service()
    try:
        initialize_upload(youtube, options)
    except HttpError as e:
        logging.error('Youtube : An HTTP error %d occurred:\n%s' % (e.resp.status,
                                                            e.content))