import requests
import json
uname = input("Username or channel ID\n")
APIkey = ""
if("U" == uname[0]):
    channelID = uname
else:
    IDlookup = requests.get("https://www.googleapis.com/youtube/v3/channels?key=" + APIkey + "&forUsername=" + uname + "&part=id&type=video")
    IDClean = IDlookup.json()
    channelID = IDClean['items'][0]['id']
    print(channelID)
firstRaw = requests.get("https://www.googleapis.com/youtube/v3/search?key=" + APIkey + "&channelId=" + channelID + "&part=snippet,id&order=viewCount&maxResults=50&type=video")
firstParse = firstRaw.json()
if(firstParse['pageInfo']['totalResults'] <= 50):
    try:
        print("https://youtube.com/watch?v=" + firstParse['items'][-1]['id']['videoId'])
    except KeyError:
        print("https://youtube.com/watch?v=" + firstParse['items'][-2]['id']['videoId'])
else:
    nextPage = firstParse['nextPageToken']
    jsonContent = "asdf"
    while(jsonContent != "[]"):
        jsonContent = ""
        nextPageContent = requests.get("https://www.googleapis.com/youtube/v3/search?pageToken=" + nextPage + "&key=" + APIkey + "&channelId=" + channelID +"&part=snippet,id&order=viewCount&maxResults=50&type=video")
        nextPageClean  = nextPageContent.json()
        jsonContent = str(nextPageClean['items'])
        try:
            nextPage = (nextPageClean['nextPageToken'])
        except KeyError:
            break
    previousPage = nextPageClean['prevPageToken']
    previousPageContent = requests.get("https://www.googleapis.com/youtube/v3/search?pageToken=" + previousPage + "&key=" + APIkey + "&channelId=" + channelID +"&part=snippet,id&order=viewCount&maxResults=50&type=video")
    previousPageClean = previousPageContent.json()
    print("https://youtube.com/watch?v=" + previousPageClean['items'][-1]['id']['videoId'])
    print("https://youtube.com/watch?v=" + previousPageClean['items'][-2]['id']['videoId'])