use crate::MAX_DEPTH;

/// A failure to read or write a Python format. Messages quote CPython's own wording where
/// the Python side raises (`TypeError`, `ValueError`), so callers can log them as is.
#[derive(Debug, thiserror::Error)]
pub enum Error {
    #[error("malformed Python literal at byte {0}")]
    InvalidLiteral(usize),
    #[error("unhashable type: '{0}'")]
    Unhashable(&'static str),
    #[error("value nests deeper than {MAX_DEPTH} levels")]
    TooDeep,
    #[error("invalid pickle: {0}")]
    InvalidPickle(String),
    #[error("Object of type {0} is not JSON serializable")]
    NotJsonSerializable(&'static str),
    #[error("keys must be str, int, float, bool or None, not {0}")]
    InvalidJsonKey(&'static str),
    #[error("Out of range float values are not JSON compliant")]
    NonFiniteFloat,
    #[error("integer does not fit in the JSON number range")]
    IntegerOutOfRange,
    #[error("Object of type {0} cannot be pickled as plain data")]
    NotPicklable(&'static str),
}