"""Plot k-step detour metrics vs k for the architectures on one figure per metric.

Data is loaded automatically from the kdetour result files saved by
maze_kstep_detour_test.py (out/maze_kdetour/kdetour_*.npz, key 'table' with
column names in 'columns'). You only need to set TASK / DATASET / configs
(via the command line, see --help). One PNG is produced per metric in
METRICS, written to out/plot/.
"""
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'

# (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']

# Each metric maps to a column name in the kdetour table.
# ylim=None means autoscale (used for JSD which is not a percentage).
METRICS = [
    ('probe_acc',   'probe accuracy (%)', (-2, 105)),
    ('c_match_jsd', 'c_match_jsd',        None),
    ('reach_acc',   'reach accuracy (%)', (-2, 105)),
]


def parse_args():
    p = argparse.ArgumentParser(description='Plot k-step detour metrics 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()


def load_table(args, model_key, config):
    """Return (k array, {col_name: values}) from the kdetour npz, or (None, None)."""
    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 'table' not in d or 'columns' not in d:
        print(f"[no table] {path}")
        return None, None
    table = np.asarray(d['table'], dtype=float)
    cols = [str(c) for c in d['columns']]
    by_col = {c: table[:, i] for i, c in enumerate(cols)}
    k = by_col.get('k')
    return k, by_col


def plot_metric(args, loaded, metric, ylabel, ylim):
    plt.figure(figsize=(9, 5.5))
    all_k = None
    plotted = 0
    for (name, key, is_tf), marker in zip(MODEL_SPECS, MARKERS):
        k, by_col = loaded[key]
        if k is None or metric not in by_col:
            continue
        config = args.tf_config if is_tf else args.rnn_config
        plt.plot(k, by_col[metric], marker=marker, markersize=6, linewidth=2,
                 label=f'{name} ({config})')
        if all_k is None or len(k) > len(all_k):
            all_k = k
        plotted += 1

    if plotted == 0:
        print(f"[{metric}] nothing to plot: no kdetour npz files found.")
        plt.close()
        return

    plt.xlabel('detour length k (steps)', fontsize=12)
    plt.ylabel(ylabel, fontsize=12)
    plt.title(f'k-step detour {metric} (Task {args.task}, {args.dataset})', fontsize=13)
    ax = plt.gca()
    ticks = [int(x) for x in all_k]
    ax.set_xticks(ticks)
    ax.set_xticklabels([str(t) for t in ticks])
    for t, lbl in zip(ticks, ax.get_xticklabels()):
        if t >= 100:
            lbl.set_color('red')
    if ylim is not None:
        plt.ylim(*ylim)
    plt.grid(True, alpha=0.3)
    plt.legend(fontsize=10, framealpha=0.9)
    plt.tight_layout()
    out = os.path.join(
        args.out_dir,
        f'kstep_{metric}_{args.task}_{args.dataset}_{args.tf_config}_{args.rnn_config}.png')
    plt.savefig(out, dpi=150)
    plt.close()
    print(f"Saved figure to {out}")


def main():
    args = parse_args()
    os.makedirs(args.out_dir, exist_ok=True)
    loaded = {}
    for name, key, is_tf in MODEL_SPECS:
        config = args.tf_config if is_tf else args.rnn_config
        loaded[key] = load_table(args, key, config)
    for metric, ylabel, ylim in METRICS:
        plot_metric(args, loaded, metric, ylabel, ylim)


if __name__ == '__main__':
    main()