"""Plot per-layer probe accuracy for the architectures on one figure.

Data is loaded automatically from the kdetour result files saved by
maze_kstep_detour_test.py (out/maze_kdetour/kdetour_*.npz, key
'layer_probe_acc'). You only need to set TASK / DATASET / configs below.

Horizontal axis = absolute layer number. Because the RNN/SSM models here have
twice as many layers as the transformers, one transformer layer is aligned to
two Mamba/GRU layers: transformer layer i is drawn at x = 2*i. The bottom of
the plot uses two rows of tick labels -- top row = Mamba/GRU layer number,
bottom row = Transformer layer number.
"""
import os
import argparse
import numpy as np
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt

# ---------------------------------------------------------------------------
# Defaults (overridable on the command line, see --help).
# ---------------------------------------------------------------------------
TASK = 'I1'
DATASET = '10M'

# Model configs: transformer-family uses TF_CONFIG, RNN/SSM-family uses RNN_CONFIG.
TF_CONFIG = '6_6_384'
RNN_CONFIG = '12_384'

# kdetour result settings (match how the .npz files were produced).
CKPT_ITER = 10000
PATH_TYPE = 'RWs'
KDETOUR_DIR = 'out/maze_kdetour'
OUT_DIR = 'out/plot'


def parse_args():
    p = argparse.ArgumentParser(description='Plot per-layer probe accuracy from kdetour npz files.')
    p.add_argument('--task', default=TASK)
    p.add_argument('--dataset', default=DATASET)
    p.add_argument('--tf_config', default=TF_CONFIG)
    p.add_argument('--rnn_config', default=RNN_CONFIG)
    p.add_argument('--ckpt_iter', type=int, default=CKPT_ITER)
    p.add_argument('--path_type', default=PATH_TYPE)
    p.add_argument('--kdetour_dir', default=KDETOUR_DIR)
    p.add_argument('--out_dir', default=OUT_DIR)
    return p.parse_args()


# (display name, file model key, is_transformer_family). Configs come from args.
MODEL_SPECS = [
    ('Transformer',          'transformer',         True),
    ('Transformer-NextLat',  'transformer_nextlat', True),
    ('Mamba',                'mamba',               False),
    ('Mamba-2',              'mamba2',              False),
    ('Gated-DeltaNet',       'gated_deltanet',      False),
    ('GRU',                  'gru',                 False),
]

MARKERS = ['o', 's', '^', 'D', 'P', 'v']


def load_layer_probe_acc(args, model_key, config):
    """Return (layer_probe_acc array, best_layer int) from the kdetour npz, or
    (None, None) if the file is missing / has no layer_probe_acc."""
    fname = f'kdetour_{args.task}_{args.path_type}_{args.ckpt_iter}_{args.dataset}_{model_key}_{config}.npz'
    path = os.path.join(args.kdetour_dir, fname)
    if not os.path.exists(path):
        print(f"[missing] {path}")
        return None, None
    d = np.load(path, allow_pickle=True)
    if 'layer_probe_acc' not in d:
        print(f"[no layer_probe_acc] {path}")
        return None, None
    vals = np.asarray(d['layer_probe_acc'], dtype=float)
    best = int(d['best_layer']) if 'best_layer' in d else int(np.argmax(vals) + 1)
    return vals, best


def main():
    args = parse_args()
    os.makedirs(args.out_dir, exist_ok=True)
    out = os.path.join(
        args.out_dir,
        f'layer_probe_acc_{args.task}_{args.dataset}_{args.tf_config}_{args.rnn_config}.png')
    plt.figure(figsize=(10, 5.5))
    # Transformer family = is_tf True; 1 transformer layer spans 2 RNN layers,
    # so transformer layer i is placed at x = 2*i to align with Mamba/GRU.
    parsed = []
    maxx = 1
    for (name, key, is_tf), marker in zip(MODEL_SPECS, MARKERS):
        config = args.tf_config if is_tf else args.rnn_config
        vals, best = load_layer_probe_acc(args, key, config)
        if vals is None or len(vals) == 0:
            parsed.append(None)
            continue
        n = len(vals)
        x = [2 * i for i in range(1, n + 1)] if is_tf else list(range(1, n + 1))
        label = f'{name} ({config})'
        parsed.append((label, x, vals, marker, best))
        maxx = max(maxx, max(x))

    plotted = 0
    for item in parsed:
        if item is None:
            continue
        label, x, vals, marker, best = item
        plt.plot(x, vals, marker=marker, markersize=6, linewidth=2, label=label)
        print(f"{label}: {len(vals)} layers, best = L{best} ({vals[best - 1]:.1f}%)")
        plotted += 1

    if plotted == 0:
        print("Nothing to plot: no kdetour npz files found for these settings.")
        return

    # Two-row tick labels: top row = Mamba/GRU layer, bottom row = Transformer layer.
    ticks = list(range(1, maxx + 1))
    labels = []
    for t in ticks:
        tf = str(t // 2) if t % 2 == 0 else ''
        labels.append(f"{t}\n{tf}")
    plt.xticks(ticks, labels, fontsize=8)

    plt.xlabel('layer  (top: Mamba/GRU layer,  bottom: Transformer layer)', fontsize=11)
    plt.ylabel('probe accuracy (%)', fontsize=12)
    plt.title(f'Per-layer probe accuracy (Task {args.task}, {args.dataset})', fontsize=13)
    plt.ylim(-2, 105)
    plt.grid(True, alpha=0.3)
    plt.legend(fontsize=10, framealpha=0.9)
    plt.tight_layout()
    plt.savefig(out, dpi=150)
    plt.close()
    print(f"Saved figure to {out}")


if __name__ == '__main__':
    main()