// SPDX-License-Identifier: Apache-2.0

//! This test validates that we don't get stack overflows.
//!
//! If container types cause recursion, then a long list of prefixes which
//! indicate nested container types could cause the stack to overflow. We
//! test each of these types here to ensure there is no stack overflow.

use ciborium::{
    de::{from_reader, from_reader_with_recursion_limit, Error},
    value::Value,
};

#[test]
fn array() {
    let bytes = [0x9f; 128 * 1024];
    match from_reader::<Value, _>(&bytes[..]).unwrap_err() {
        Error::RecursionLimitExceeded => (),
        e => panic!("incorrect error: {:?}", e),
    }
}

#[test]
fn map() {
    let bytes = [0xbf; 128 * 1024];
    match from_reader::<Value, _>(&bytes[..]).unwrap_err() {
        Error::RecursionLimitExceeded => (),
        e => panic!("incorrect error: {:?}", e),
    }
}

#[test]
fn bytes() {
    let bytes = [0x5f; 128 * 1024];
    match from_reader::<Value, _>(&bytes[..]).unwrap_err() {
        Error::Io(..) => (),
        e => panic!("incorrect error: {:?}", e),
    }
}

#[test]
fn text() {
    let bytes = [0x7f; 128 * 1024];
    match from_reader::<Value, _>(&bytes[..]).unwrap_err() {
        Error::Io(..) => (),
        e => panic!("incorrect error: {:?}", e),
    }
}

#[test]
fn array_limit() {
    let bytes = [0x9f; 128 * 1024];
    for limit in 16..256 {
        match from_reader_with_recursion_limit::<Value, _>(&bytes[..], limit).unwrap_err() {
            Error::RecursionLimitExceeded => (),
            e => panic!("incorrect error with limit {}: {:?}", limit, e),
        }
        // Data that is nested beyond the limit should fail with `RecursionLimitExceeded`
        match from_reader_with_recursion_limit::<Value, _>(&bytes[..limit + 1], limit).unwrap_err()
        {
            Error::RecursionLimitExceeded => (),
            e => panic!("incorrect error with limit {}: {:?}", limit, e),
        }
        // Data that is nested within the limit fails with a different error.
        match from_reader_with_recursion_limit::<Value, _>(&bytes[..limit], limit).unwrap_err() {
            Error::Io(..) => (),
            e => panic!("incorrect error with limit {}: {:?}", limit, e),
        }
    }
}

#[test]
fn map_limit() {
    let bytes = [0xbf; 128 * 1024];
    for limit in 16..256 {
        match from_reader_with_recursion_limit::<Value, _>(&bytes[..], limit).unwrap_err() {
            Error::RecursionLimitExceeded => (),
            e => panic!("incorrect error with limit {}: {:?}", limit, e),
        }
        // Data that is nested beyond the limit should fail with `RecursionLimitExceeded`
        match from_reader_with_recursion_limit::<Value, _>(&bytes[..limit + 1], limit).unwrap_err()
        {
            Error::RecursionLimitExceeded => (),
            e => panic!("incorrect error with limit {}: {:?}", limit, e),
        }
        // Data that is nested within the limit fails with a different error.
        match from_reader_with_recursion_limit::<Value, _>(&bytes[..limit], limit).unwrap_err() {
            Error::Io(..) => (),
            e => panic!("incorrect error with limit {}: {:?}", limit, e),
        }
    }
}