from collections.abc import Iterator
from typing import TypedDict

from folkugat_web.dal.sql import Connection, get_connection
from folkugat_web.dal.sql.sessions import conversion as sessions_conversion
from folkugat_web.model import playlists as model
from folkugat_web.model.sessions import Session
from folkugat_web.utils import groupby

from . import conversion


class QueryData(TypedDict, total=False):
    id: int
    set_id: int
    playlist_id: int


def _filter_clause(
    entry_id: int | None = None,
    set_id: int | None = None,
    playlist_id: int | None = None,
) -> tuple[str, QueryData]:
    filter_clauses: list[str] = []
    query_data: QueryData = {}

    if entry_id is not None:
        filter_clauses.append("id = :id")
        query_data["id"] = entry_id
    if set_id is not None:
        filter_clauses.append("set_id = :set_id")
        query_data["set_id"] = set_id
    if playlist_id is not None:
        filter_clauses.append("playlist_id = :playlist_id")
        query_data["playlist_id"] = playlist_id

    return " AND ".join(filter_clauses), query_data


def get_playlist_entries(
    entry_id: int | None = None,
    set_id: int | None = None,
    playlist_id: int | None = None,
    con: Connection | None = None,
) -> Iterator[model.PlaylistEntry]:
    filter_clause, data = _filter_clause(entry_id=entry_id, set_id=set_id, playlist_id=playlist_id)
    query = f"""
      SELECT
        id, playlist_id, set_id, tema_id
      FROM playlist_entries
      WHERE {filter_clause}
      ORDER BY id ASC
    """
    with get_connection(con) as con:
        cur = con.cursor()
        _ = cur.execute(query, data)
        return map(conversion.row_to_playlist_entry, cur.fetchall())