#!/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
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

# 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)


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:
            print('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)')
                    print(template % response['id'])
                else:
                    template = ('Youtube : The upload failed with an '
                                'unexpected response: %s')
                    exit(template % response)
        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:
        print(error)
        retry += 1
        if retry > MAX_RETRIES:
            exit('Youtube : No longer attempting to retry.')

        max_sleep = 2 ** retry
        sleep_seconds = random.random() * max_sleep
        print('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:
        print('Youtube : An HTTP error %d occurred:\n%s' % (e.resp.status,
                                                            e.content))