bgg_api/src/modules/bgg_connection.py

import requests
import xml.etree.ElementTree as ET
from pydantic import HttpUrl
import requests
from datetime import datetime

from src.classes import boardgame_classes
from src.modules import auth_manager


authenticated_session: requests.Session = requests.Session()

def url_to_xml_object(url: HttpUrl) -> ET.Element:
    r = authenticated_session.get(url)
    assert r.status_code == 200, "Got {} status code".format(r.status_code)
    root = ET.fromstring(r.content)
    return root

def get_boardgame(boardgame_id: int) -> boardgame_classes.BoardGame:
    url : str = "https://boardgamegeek.com/xmlapi2/thing?id={}&stats=true".format(boardgame_id)
    boardgame_xml_object : ET.Element = url_to_xml_object(url)

    requested_boardgame = convert_xml_to_boardgame(boardgame_xml_object.find('item'))

    return requested_boardgame

def get_multiple_boardgames(boardgame_ids: list[int]) -> list[boardgame_classes.BoardGame]:

    def divide_list_in_chunks(list_to_divide: list[int], chunk_size: int = 20): 
        for i in range(0, len(list_to_divide), chunk_size):  
            yield list_to_divide[i:i + chunk_size] 

    
    boardgame_list_to_return: list[boardgame_classes.BoardGame] = []

    #Boardgamegeek only allows chunks of 20 boardgames at a time
    boardgame_ids_divided = list(divide_list_in_chunks(boardgame_ids))

    for boardgame_id_list_size_20 in boardgame_ids_divided:
        boardgame_id_list_commas: str = ','.join(boardgame_id_list_size_20)
        url : str = "https://boardgamegeek.com/xmlapi2/thing?id={}&stats=true".format(boardgame_id_list_commas)
        boardgames_xml_object : ET.Element = url_to_xml_object(url)

        for boardgame_xml_object in boardgames_xml_object:
            requested_boardgame = convert_xml_to_boardgame(boardgame_xml_object)
            boardgame_list_to_return.append(requested_boardgame)

    return boardgame_list_to_return


#Requires single boardgame XML 'item' from bgg api on /thing
def convert_xml_to_boardgame(boardgame_xml: ET.Element) -> boardgame_classes.BoardGame:

    boardgame_type = boardgame_xml.get('type')

    expansion_ids: list[int] = []

    all_links = boardgame_xml.findall('link')

    for link in all_links:
        if link.get('type') == 'boardgameexpansion':
            expansion_ids.append(int(link.get('id')))

    boardgame_dict = {
        "id" : int(boardgame_xml.get('id')),
        "name" : boardgame_xml.find('name').get('value'),
        "description" : boardgame_xml.find('description').text,
        "image_url" : boardgame_xml.find('image').text,
        "thumbnail_url" : boardgame_xml.find('thumbnail').text,
        "year_published" : int(boardgame_xml.find('yearpublished').get('value')),
        "min_players" : int(boardgame_xml.find('minplayers').get('value')),
        "max_players" : int(boardgame_xml.find('maxplayers').get('value')),
        "min_playing_time" : int(boardgame_xml.find('minplaytime').get('value')),
        "max_playing_time" : int(boardgame_xml.find('maxplaytime').get('value')),
        "min_age" : int(boardgame_xml.find('minage').get('value')),
        "all_expansion_ids" : expansion_ids
    }

    match boardgame_type:
        case "boardgame":
            boardgame = boardgame_classes.BoardGame(**boardgame_dict)
        case "boardgameexpansion":
            boardgame = boardgame_classes.BoardGameExpansion(**boardgame_dict)

    

    return boardgame

def convert_collection_xml_to_boardgame(boardgame_extra_info: boardgame_classes.BoardGame, collection_boardgame_xml: ET.Element) -> boardgame_classes.BoardGame:

    boardgame_type = collection_boardgame_xml.get('subtype')

    price_paid = collection_boardgame_xml.find('privateinfo').get('pricepaid')
    if price_paid == '':
        price_paid = 0.0
    else:
        price_paid = float(price_paid)


    date_string = collection_boardgame_xml.find('privateinfo').get('acquisitiondate')
    if date_string == '':
        date_string = '1970-01-01'

    
    acquisition_date = datetime.strptime(date_string, '%Y-%m-%d').date()
        
    acquired_from = collection_boardgame_xml.find('privateinfo').get('acquiredfrom')

    collection_boardgame_dict = {
        "price_paid" : price_paid,
        "acquisition_date" : acquisition_date,
        "acquired_from" : acquired_from
    }

    boardgame_dict = {
        "id" : boardgame_extra_info.id,
        "name" : boardgame_extra_info.name,
        "description" : boardgame_extra_info.description,
        "image_url" : boardgame_extra_info.image_url,
        "thumbnail_url" : boardgame_extra_info.thumbnail_url,
        "year_published" : boardgame_extra_info.year_published,
        "min_players" : boardgame_extra_info.min_players,
        "max_players" : boardgame_extra_info.max_players,
        "min_playing_time" : boardgame_extra_info.min_playing_time,
        "max_playing_time" : boardgame_extra_info.max_playing_time,
        "min_age" : boardgame_extra_info.min_age,
        "all_expansion_ids" : boardgame_extra_info.all_expansion_ids,
        **collection_boardgame_dict
    }

    match boardgame_type:
        case "boardgame":
            boardgame = boardgame_classes.CollectionBoardGame(**boardgame_dict)
        case "boardgameexpansion":
            boardgame = boardgame_classes.CollectionBoardGameExpansion(**boardgame_dict)

    

    return boardgame

#Creates list of board games from a collection '/collection' URL
def get_boardgames_from_collection_url(collection_url: str) -> list[boardgame_classes.BoardGame]:
    collection_xml = url_to_xml_object(collection_url)

    collection_list: list[boardgame_classes.BoardGame] = []

    collection_id_list: list[int] = []

    #Get all board game ID's from the collection
    for boardgame_item in collection_xml:
        collection_id_list.append(boardgame_item.get('objectid'))

    #Request extra info about the ID's
    boardgame_extras = get_multiple_boardgames(collection_id_list)

    assert len(boardgame_extras) == len(collection_xml)

    current_index = 0

    for boardgame_item in collection_xml:
        boardgame_extra = boardgame_extras[current_index]
        boardgame = convert_collection_xml_to_boardgame(boardgame_extra, boardgame_item)
        collection_list.append(boardgame)
        current_index += 1

    return collection_list

def get_user_owned_collection() -> list[boardgame_classes.BoardGame]:
    url_no_expansions = 'https://boardgamegeek.com/xmlapi2/collection?username={}&own=1&stats=1&excludesubtype=boardgameexpansion&showprivate=1&version=1'.format(auth_manager.username)
    owned_boardgames = get_boardgames_from_collection_url(url_no_expansions)

    url_only_expansions = 'https://boardgamegeek.com/xmlapi2/collection?username={}&own=1&stats=1&subtype=boardgameexpansion&showprivate=1&version=1'.format(auth_manager.username)
    owned_boardgame_expansions = get_boardgames_from_collection_url(url_only_expansions)
    
    owned_boardgames += owned_boardgame_expansions

    return owned_boardgames
    
def get_user_wishlist_collection() -> list[boardgame_classes.BoardGame]:
    url = 'https://boardgamegeek.com/xmlapi2/collection?username={}&wishlist=1&stats=1&showprivate=1&version=1'.format(auth_manager.username)
    wishlisted_boardgames = get_boardgames_from_collection_url(url)

    return wishlisted_boardgames


def load_authenticated_bgg_session(username: str, password: str) -> requests.Session:
    global authenticated_session

    login_url = "https://boardgamegeek.com/login/api/v1"

    post_data = {
        "credentials":{
            "username": username,
            "password": password
        }
    }


    assert len(authenticated_session.cookies) == 0, 'Session already exists'

    login_response = authenticated_session.post(login_url, json=post_data)

    assert login_response.status_code == 204, "Login failed!"
   
load_authenticated_bgg_session(auth_manager.username, auth_manager.password)