from __future__ import annotations

from typing import Any


def resolve_account(
    accounts: dict[str, Any],
    account_id: str | None = None,
    sender_address: str | None = None,
) -> dict[str, Any] | None:
    if account_id and account_id in accounts:
        return accounts[account_id]

    if not accounts:
        return None

    if "default" in accounts:
        return accounts["default"]

    first_key = next(iter(accounts))
    return accounts[first_key]


def resolve_account_for_handle(
    accounts: dict[str, Any],
    handle: str,
) -> dict[str, Any] | None:
    for acc_id, acc_config in accounts.items():
        if not isinstance(acc_config, dict):
            continue
        mapping = acc_config.get("handle_mapping", {})
        if isinstance(mapping, dict) and handle in mapping:
            return acc_config
    return None