import aiohttp
import asyncio
import requests
import time
from config import api_key, channel_id, base_url

start_time = time.time()

# Get the ID from the Uploads Playlist.
url = f'{base_url}/channels?id={channel_id}&key={api_key}&part=contentDetails'
r = requests.get(url)
results = r.json()['items']
playlist_id = results[0]['contentDetails']['relatedPlaylists']['uploads']

# Get all of the video IDs.
video_ids = []
url = f'{base_url}/playlistItems?playlistId={playlist_id}&key={api_key}&part=contentDetails'
while True:
    r = requests.get(url)
    results = r.json()
    if 'nextPageToken' in results:
        nextPageToken = results['nextPageToken']
    else:
        nextPageToken = None

    if 'items' in results:
        for item in results['items']:
            if 'contentDetails' in item:
                if 'videoId' in item['contentDetails']:
                    videoId = item['contentDetails']['videoId']
                    video_ids.append(videoId)

    if nextPageToken:
        url = f'{base_url}/playlistItems?playlistId={playlist_id}&key={api_key}&part=contentDetails&pageToken={nextPageToken}'
    else:
        break

async def main():
    async with aiohttp.ClientSession() as session:
        tasks = []
        for video_id in video_ids:
            task = asyncio.ensure_future(get_video_data(session, video_id))
            tasks.append(task)

        view_counts = await asyncio.gather(*tasks)

    print('Number of videos:', 2*'\t', len(view_counts))
    print('Average number of views:', '\t', sum(view_counts) / len(view_counts))

async def get_video_data(session, video_id):
    url = f'{base_url}/videos?id={video_id}&key={api_key}&part=statistics'
    
    async with session.get(url) as response:
        result_data = await response.json()
        results = result_data['items']
        viewCount = results[0]['statistics']['viewCount']
        return int(viewCount)

asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
asyncio.run(main())

print("--- %s seconds ---" % (time.time() - start_time))