from decimal import Decimal
from urllib.parse import urlencode

from apps.players.forms import PlayerSearchForm

IGNORED_QUERY_KEYS = {"page", "csrfmiddlewaretoken"}


def _serialize_value(value):
    if value is None:
        return None
    if hasattr(value, "pk"):
        return value.pk
    if isinstance(value, Decimal):
        return str(value)
    return value


def extract_filters_from_params(params):
    payload = params.copy()
    for key in IGNORED_QUERY_KEYS:
        payload.pop(key, None)

    form = PlayerSearchForm(payload)
    if not form.is_valid():
        return {}

    result = {}
    for key, value in form.cleaned_data.items():
        serialized = _serialize_value(value)
        if serialized in (None, ""):
            continue
        result[key] = serialized
    return result


def saved_search_to_querystring(filters: dict) -> str:
    return urlencode(filters, doseq=True)