mfsk-core 0.4.1

//! Ordered Statistics Decoding (OSD), generic over [`LdpcParams`].
//!
//! Originally ported from WSJT-X `osd174_91.f90`. Phase 0c-B
//! generalised the algorithm so [`super::Ldpc174_91`] and
//! [`Ldpc240_101`](crate::fec::Ldpc240_101) share a single
//! implementation; the matrix shape comes from `P` at compile time. The non-generic
//! [`osd_decode`] / [`osd_decode_deep`] / [`osd_decode_deep4`]
//! entry points pin `P = Ldpc174_91Params` for FT8's bespoke decode
//! path which calls them directly via `super::ft8::ldpc`'s re-export
//! façade.

use alloc::vec;
use alloc::vec::Vec;

use super::bp::check_crc14;
use super::params::{Ldpc174_91Params, LdpcParams};
use super::{LDPC_K, LDPC_N};

// ────────────────────────────────────────────────────────────────────────────
// Generator parity sub-matrix

/// Parity generator sub-matrix P[83][91].
/// Parsed from WSJT-X ldpc_174_91_c_generator.f90.
/// Full systematic generator G[row][col]:
///   col <  91 → G[row][col] = (row == col) as u8   (identity block)
///   col >= 91 → G[row][col] = GEN_PARITY[col-91][row]
///
/// Visible to the sibling [`super::params`] module so the generic
/// [`super::params::LdpcParams::gen_parity`] accessor can return
/// these bytes without copying.
pub(super) const GEN_PARITY: [[u8; 91]; 83] = [
    [
        1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0,
        0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1,
        0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1,
        0,
    ],
    [
        0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1,
        1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1,
        0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0,
        1,
    ],
    [
        1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0,
        1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0,
        0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1,
        0,
    ],
    [
        0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0,
        0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1,
        0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0,
        1,
    ],
    [
        0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1,
        1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1,
        1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0,
        1,
    ],
    [
        0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0,
        0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0,
        1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0,
        1,
    ],
    [
        0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1,
        1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1,
        0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0,
        1,
    ],
    [
        0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1,
        0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1,
        0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1,
        1,
    ],
    [
        1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1,
        0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0,
        0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0,
        0,
    ],
    [
        0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0,
        0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1,
        1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0,
        0,
    ],
    [
        1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
        1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1,
        0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1,
        0,
    ],
    [
        0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0,
        1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1,
        1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0,
        1,
    ],
    [
        0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0,
        1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1,
        1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0,
        0,
    ],
    [
        1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0,
        0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
        1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1,
        1,
    ],
    [
        0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1,
        0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0,
        0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0,
        0,
    ],
    [
        1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0,
        0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0,
        0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0,
        0,
    ],
    [
        0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1,
        0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1,
        0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0,
        0,
    ],
    [
        0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0,
        0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1,
        1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1,
        1,
    ],
    [
        0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
        0, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0,
        0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1,
        1,
    ],
    [
        0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1,
        1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 0,
        0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1,
        0,
    ],
    [
        1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0,
        0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1,
        1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0,
        0,
    ],
    [
        0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0,
        0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0,
        0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0,
        0,
    ],
    [
        0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1,
        1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0,
        1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0,
        0,
    ],
    [
        0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1,
        0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0,
        1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1,
        0,
    ],
    [
        1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1,
        1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1,
        0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1,
        1,
    ],
    [
        1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1,
        0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1,
        0, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0,
        1,
    ],
    [
        0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0,
        1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0,
        1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0,
        0,
    ],
    [
        1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0,
        1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1,
        0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0,
        0,
    ],
    [
        1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0,
        1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1,
        1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1,
        0,
    ],
    [
        0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1,
        1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0,
        1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1,
        1,
    ],
    [
        0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0,
        0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
        0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0,
        0,
    ],
    [
        0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0,
        0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1,
        0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0,
        1,
    ],
    [
        1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0,
        0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1,
        1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1,
        0,
    ],
    [
        1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1,
        0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1,
        1, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1,
        0,
    ],
    [
        0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1,
        0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0,
        0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0,
        0,
    ],
    [
        0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1,
        1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0,
        1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0,
        0,
    ],
    [
        0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1,
        0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0,
        0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1,
        1,
    ],
    [
        1, 1, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1,
        1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1,
        1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 1,
        1,
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    [
        1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0,
        0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1,
        1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1,
        0,
    ],
    [
        1, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1,
        1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0,
        0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0,
        0,
    ],
    [
        0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1,
        1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0,
        0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0,
        1,
    ],
    [
        0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1,
        0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0,
        0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1,
        0,
    ],
    [
        0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 1,
        1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1,
        0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0,
        0,
    ],
];

// ────────────────────────────────────────────────────────────────────────────
// Systematic encoder

/// Generic systematic encode. `info.len() == P::K`, `cw.len() == P::N`.
/// `cw[..K] = info`; `cw[K..N]` filled from [`LdpcParams::gen_parity`].
pub fn ldpc_encode_generic<P: LdpcParams>(info: &[u8], cw: &mut [u8]) {
    debug_assert_eq!(info.len(), P::K, "info length must equal P::K");
    debug_assert_eq!(cw.len(), P::N, "cw length must equal P::N");
    cw[..P::K].copy_from_slice(info);
    for j in 0..P::M {
        let mut p = 0u8;
        for k in 0..P::K {
            p ^= P::gen_parity(j, k) & info[k];
        }
        cw[P::K + j] = p;
    }
}

/// Encode 91 information bits into a 174-bit LDPC(174,91) codeword.
///
/// Systematic: `codeword[0..91] = info`, parity bits `codeword[91..174]`
/// from `GEN_PARITY`. Backward-compat wrapper around
/// [`ldpc_encode_generic`] pinned to [`Ldpc174_91Params`].
pub fn ldpc_encode(info: &[u8; LDPC_K]) -> [u8; LDPC_N] {
    let mut cw = [0u8; LDPC_N];
    ldpc_encode_generic::<Ldpc174_91Params>(info.as_slice(), cw.as_mut_slice());
    cw
}

// ────────────────────────────────────────────────────────────────────────────
// Public API

/// Output of a successful OSD decode.
///
/// `info` and `codeword` are heap-allocated so the struct can serve
/// any [`LdpcParams`]'s K / N. `message77` exposes the leading 77
/// bits as a fixed-size array for legacy Wsjt77-family callers.
pub struct OsdResult {
    /// Leading 77 info bits (Wsjt77 message field). Same content as
    /// `info[..77]` — duplicated for callers that take fixed-size
    /// references.
    pub message77: [u8; 77],
    /// Full systematic info (length `P::K`).
    pub info: Vec<u8>,
    /// Full codeword (length `P::N`, original bit ordering).
    pub codeword: Vec<u8>,
    /// Number of hard errors (bits where hard decision disagrees with LLR sign).
    pub hard_errors: u32,
}

/// OSD with configurable order — pinned to LDPC(174, 91).
///
/// - ndeep=1: order-0 + order-1 (92 candidates)
/// - ndeep=2: + order-2 (4,187 total)
/// - ndeep=3: + order-3 (121,667 total)
///
/// Higher order recovers weaker signals at the cost of runtime.
pub fn osd_decode_deep(
    llr: &[f32; LDPC_N],
    ndeep: u8,
    verify: Option<fn(&[u8]) -> bool>,
) -> Option<OsdResult> {
    osd_decode_generic::<Ldpc174_91Params>(llr.as_slice(), ndeep, LDPC_K, verify)
}

/// OSD order-4 decode with Top-K LLR pruning — pinned to LDPC(174, 91).
///
/// Runs the standard order-3 search (all 91 MRB bits) plus an order-4
/// extension limited to the `k4_limit` *least* reliable MRB bits.
/// Because errors concentrate in low-|LLR| bits, restricting k4 to the
/// tail (e.g. k4_limit=30) gives C(30,4)=27,405 extra candidates —
/// comparable cost to order-3 — while catching the 4-bit-error cases
/// that order-3 misses.
///
/// Recommended k4_limit: 30 (empirically chosen).
pub fn osd_decode_deep4(
    llr: &[f32; LDPC_N],
    k4_limit: usize,
    verify: Option<fn(&[u8]) -> bool>,
) -> Option<OsdResult> {
    osd_decode_generic::<Ldpc174_91Params>(llr.as_slice(), 4, k4_limit, verify)
}

/// OSD order-2 decode (default) — pinned to LDPC(174, 91) with the
/// legacy implicit `check_crc14` verifier.
///
/// Sorts bits by |LLR| reliability, builds the permuted systematic generator,
/// performs GF(2) Gaussian elimination to isolate the 91 most reliable basis
/// (MRB) bits, then tests the order-0 hard-decision candidate plus all 91
/// single-bit flips and all C(91,2) = 4,095 two-bit flips.
/// Returns the minimum-weighted CRC-passing codeword, or `None` if none passes.
pub fn osd_decode(llr: &[f32; LDPC_N]) -> Option<OsdResult> {
    osd_decode_generic::<Ldpc174_91Params>(llr.as_slice(), 2, LDPC_K, Some(check_crc14))
}

/// Generic OSD with configurable order, parameterised over [`LdpcParams`].
///
/// `ndeep`: search depth (1..=4). `k4_limit`: upper bound (exclusive)
/// on bit indices used in the order-4 extension; ignored when
/// `ndeep < 4`. `verify`: parity-converged candidate filter; pass
/// `Some(check_crc)` for codecs whose info bits include an inline
/// integrity field, `None` to accept any parity-valid candidate.
///
/// Algorithm identical to the WSJT-X reference; only the working
/// buffer shapes are runtime-sized to accommodate either LDPC code.
pub fn osd_decode_generic<P: LdpcParams>(
    llr: &[f32],
    ndeep: u8,
    k4_limit: usize,
    verify: Option<fn(&[u8]) -> bool>,
) -> Option<OsdResult> {
    debug_assert_eq!(llr.len(), P::N, "llr length must equal P::N");

    let n = P::N;
    let k = P::K;

    // ── Step 1: sort bit indices by |LLR| descending ────────────────
    let mut perm: Vec<usize> = (0..n).collect();
    perm.sort_unstable_by(|&a, &b| {
        llr[b]
            .abs()
            .partial_cmp(&llr[a].abs())
            .unwrap_or(core::cmp::Ordering::Equal)
    });

    // ── Step 2: build permuted generator matrix G'[K][N] (flat) ─────
    // G[row][col] in original space:
    //   col <  K → identity: G[row][col] = (row == col) as u8
    //   col >= K → parity:   G[row][col] = gen_parity(col - K, row)
    // Flat index: g[row * n + col].
    let mut g: Vec<u8> = vec![0u8; k * n];
    for row in 0..k {
        for col in 0..n {
            let j = perm[col];
            g[row * n + col] = if j < k {
                (row == j) as u8
            } else {
                P::gen_parity(j - k, row)
            };
        }
    }

    // ── Step 3: GF(2) Gaussian elimination (RREF, no column swaps) ──
    let mut pivot_col: Vec<usize> = vec![0; k];
    let mut pivot_row = 0usize;

    for col in 0..n {
        if pivot_row >= k {
            break;
        }
        let mut found: Option<usize> = None;
        for r in pivot_row..k {
            if g[r * n + col] != 0 {
                found = Some(r);
                break;
            }
        }
        if let Some(r) = found {
            if r != pivot_row {
                for c in 0..n {
                    g.swap(r * n + c, pivot_row * n + c);
                }
            }
            for r2 in 0..k {
                if r2 != pivot_row && g[r2 * n + col] != 0 {
                    for c in 0..n {
                        g[r2 * n + c] ^= g[pivot_row * n + c];
                    }
                }
            }
            pivot_col[pivot_row] = col;
            pivot_row += 1;
        }
    }

    if pivot_row < k {
        return None; // degenerate (shouldn't happen with a valid LDPC code)
    }

    // ── Step 4: hard decisions on MRB bits ──────────────────────────
    let mut mrb: Vec<u8> = vec![0u8; k];
    for r in 0..k {
        let orig = perm[pivot_col[r]];
        mrb[r] = if llr[orig] > 0.0 { 1 } else { 0 };
    }

    // ── Step 5: encode order-0 candidate ────────────────────────────
    let mut c_perm: Vec<u8> = vec![0u8; n];
    for r in 0..k {
        if mrb[r] == 1 {
            for col in 0..n {
                c_perm[col] ^= g[r * n + col];
            }
        }
    }

    // Helper: unpermute, verify, compute weighted distance.
    // Returned tuples carry full Vec<u8>'s for both info and codeword
    // so any P::K / P::N works.
    let try_candidate = |cp: &[u8]| -> Option<(Vec<u8>, Vec<u8>, f32)> {
        let mut c = vec![0u8; n];
        for col in 0..n {
            c[perm[col]] = cp[col];
        }
        let decoded = c[..k].to_vec();
        if let Some(f) = verify
            && !f(&decoded)
        {
            return None;
        }
        let mut wd = 0.0f32;
        for col in 0..n {
            let hard = if llr[perm[col]] > 0.0 { 1u8 } else { 0u8 };
            if cp[col] != hard {
                wd += llr[perm[col]].abs();
            }
        }
        Some((decoded, c, wd))
    };

    let mut best: Option<(Vec<u8>, Vec<u8>, f32)> = None;
    let mut update_best = |decoded: Vec<u8>, cw: Vec<u8>, wd: f32| {
        let improve = best.as_ref().is_none_or(|(_, _, bd)| wd < *bd);
        if improve {
            best = Some((decoded, cw, wd));
        }
    };

    // Order-0.
    if let Some((d, cw, wd)) = try_candidate(&c_perm) {
        update_best(d, cw, wd);
    }

    // Orders 1..ndeep: flip 1, 2, …, ndeep MRB bits. Reuse buffers
    // across iterations to avoid per-candidate Vec allocs.
    let mut c1 = vec![0u8; n];
    let mut c2 = vec![0u8; n];
    let mut c3 = vec![0u8; n];
    let mut c4 = vec![0u8; n];
    for k1 in 0..k {
        c1.copy_from_slice(&c_perm);
        for col in 0..n {
            c1[col] ^= g[k1 * n + col];
        }
        if let Some((d, cw, wd)) = try_candidate(&c1) {
            update_best(d, cw, wd);
        }
        if ndeep < 2 {
            continue;
        }
        for k2 in (k1 + 1)..k {
            c2.copy_from_slice(&c1);
            for col in 0..n {
                c2[col] ^= g[k2 * n + col];
            }
            if let Some((d, cw, wd)) = try_candidate(&c2) {
                update_best(d, cw, wd);
            }
            if ndeep < 3 {
                continue;
            }
            for k3 in (k2 + 1)..k {
                c3.copy_from_slice(&c2);
                for col in 0..n {
                    c3[col] ^= g[k3 * n + col];
                }
                if let Some((d, cw, wd)) = try_candidate(&c3) {
                    update_best(d, cw, wd);
                }
                if ndeep >= 4 && k3 + 1 < k4_limit {
                    for k4 in (k3 + 1)..k4_limit.min(k) {
                        c4.copy_from_slice(&c3);
                        for col in 0..n {
                            c4[col] ^= g[k4 * n + col];
                        }
                        if let Some((d, cw, wd)) = try_candidate(&c4) {
                            update_best(d, cw, wd);
                        }
                    }
                }
            }
        }
    }

    // ── Step 6: return best ─────────────────────────────────────────
    let (decoded, codeword, _) = best?;
    let mut hard_errors = 0u32;
    for i in 0..n {
        if (codeword[i] == 1) != (llr[i] > 0.0) {
            hard_errors += 1;
        }
    }
    let mut message77 = [0u8; 77];
    message77.copy_from_slice(&decoded[..77]);
    Some(OsdResult {
        message77,
        info: decoded,
        codeword,
        hard_errors,
    })
}

#[cfg(test)]
mod tests {
    use super::*;

    /// All-zero LLR should not produce a spurious decode (CRC check guards it).
    #[test]
    fn zero_llr_no_spurious_decode() {
        let llr = [0.0f32; LDPC_N];
        // The all-zero codeword may or may not pass CRC; just check no panic.
        let _ = osd_decode(&llr);
    }

    /// Verify that ldpc_encode produces codewords that satisfy ALL 83 parity
    /// check equations stored in the NM/NRW tables.
    ///
    /// If this test fails, GEN_PARITY is inconsistent with the check matrix —
    /// confirmed encoder bug.
    #[test]
    fn verify_ldpc_encode_parity() {
        use super::super::LDPC_M;
        use super::super::tables::{NM, NRW};

        // Test with several different info vectors to catch row-specific bugs.
        let test_infos: &[[u8; LDPC_K]] = &[
            [1u8; LDPC_K], // all ones
            {
                let mut v = [0u8; LDPC_K];
                for i in (0..LDPC_K).step_by(2) {
                    v[i] = 1;
                }
                v
            }, // alternating
            {
                let mut v = [0u8; LDPC_K];
                // first 77 bits = 1 (message), last 14 = 0 (CRC placeholder)
                for i in 0..77 {
                    v[i] = 1;
                }
                v
            },
        ];

        for (t, info) in test_infos.iter().enumerate() {
            let cw = ldpc_encode(info);
            for j in 0..LDPC_M {
                let n = NRW[j] as usize;
                let check: u8 = NM[j][..n]
                    .iter()
                    .map(|&i| cw[i as usize])
                    .fold(0u8, |acc, b| acc ^ b);
                assert_eq!(
                    check, 0,
                    "GEN_PARITY inconsistency: parity check row {} failed for test info #{} — encoder bug confirmed",
                    j, t
                );
            }
        }
    }
}