# -*- coding: utf-8 -*-

# Sample Python code for youtube.playlists.update
# See instructions for running these code samples locally:
# https://developers.google.com/explorer-help/code-samples#python

import argparse
import os
import re

from googleapiclient.discovery import build
from google_auth_oauthlib.flow import InstalledAppFlow
import googleapiclient.errors

scopes = ["https://www.googleapis.com/auth/youtube.force-ssl"]

channels = {
    "breakbeat_sesiones":"PLZFfy80_qguYVqbpQlX-aHdiYHTwc6-wW",
    "breakbeat_temas":"PLZFfy80_qguZnpBYfSFlkMdjGIfVcz7e7",
    "wods": "PLZFfy80_qguYCbTDQD0GSK4zUzEjbQMQT",
    "rap_español": "PLZFfy80_qgub44wWWDcAykdQCJNCXo4jp",
}

def get_playlist_length(youtube, playlist_id):
    items = youtube.playlists().list(
        part="snippet,contentDetails",
        id=playlist_id
    )
    playlist_info = items.execute()

    return playlist_info['items'][0]['contentDetails']['itemCount']

def list_songs(youtube, channel_id, stdout=False):
    max_results = 50
    request = youtube.playlistItems().list(
        part="snippet,contentDetails",
        maxResults=max_results,
        playlistId=channel_id
    )
    response = request.execute()
    print()

    # Process the first page of results
    deleted = 0
    songs_list = []
    
    for idx, item in enumerate(response['items'], start=1):
        title = item['snippet']['title']
        if title == "Deleted video":
            deleted += 1
            continue
        songs_list.append(f"{idx-deleted:02d} - {title}")

    # Continue making requests for additional pages using pageToken
    new_starting = 51
    while 'nextPageToken' in response:
        request = youtube.playlistItems().list(
            part='snippet',
            playlistId=channel_id,
            maxResults=max_results,
            pageToken=response['nextPageToken']
        )
        response = request.execute()

        # Process the results for the additional pages
        for idx, item in enumerate(response['items'], start=new_starting):
            title = item['snippet']['title']
            if title == "Deleted video":
                deleted += 1
                continue    
            songs_list.append(f"{idx-deleted:02d} - {title}")
        new_starting += 50
    
    if stdout:
        # Print to standard output
        print("\n".join(songs_list))

    get_key_by_value = lambda dict, val: next((k for k, v in dict.items() if v == val), None)
    
    channel_name = get_key_by_value(channels, channel_id)

    # Save to file if output_file is provided
    with open(f"{channel_name} songs", 'w', encoding='utf-8') as file:
        file.write("\n".join(songs_list))

def add_song(youtube, channel_id, song):
    pos = get_playlist_length(youtube, channel_id)

    request = youtube.playlistItems().insert(
        part="snippet",
        body={
            "snippet": {
                "playlistId": channel_id,
                "position": pos,
                "resourceId": {
                    "kind": "youtube#video",
                    "videoId": song
                }
            }
        }
    )
    response = request.execute()
    print("\nSong added successfully!")


def main():
    parser = argparse.ArgumentParser(description="Manage YouTube playlist songs.")
    parser.add_argument("-l", "--list", action="store_true", help="List songs in the playlist")
    parser.add_argument("-a", "--add", metavar="song", help="Add a song to the playlist")
    parser.add_argument("channel_name", help="Name of the playlist")

    args = parser.parse_args()
    channel_name = args.channel_name
    channel_id = channels.get(channel_name)

    if not args.list and not args.add:
        parser.error("Please provide either -l or -a option.")

    if not channel_id:
        print(f"Error: Channel '{channel_name}' not found.")
        return

    # Disable OAuthlib's HTTPS verification when running locally.
    # *DO NOT* leave this option enabled in production.
    os.environ["OAUTHLIB_INSECURE_TRANSPORT"] = "1"

    api_service_name = "youtube"
    api_version = "v3"
    client_secret = "./client_secrets.json"
    
    flow = InstalledAppFlow.from_client_secrets_file(
        client_secret, scopes)
    credentials = flow.run_local_server(port=0)

    youtube = build(
        api_service_name, api_version,
        credentials=credentials)

    if args.list:
        list_songs(youtube, channel_id, stdout=False)
    elif args.add:
        song = args.add
        # # this assumes a song is passed as in either of the following ways
        # # https://youtu.be/eEnyi9L6KP4 --> split by "/"
        # # https://youtube.com/watch?v=Ez-gizOF0Wo --> split by "="
        song = re.split(r"/|=", song)[-1]
        add_song(youtube, channel_id, song)

if __name__ == "__main__":
    main()