"""
Temporal evolution for ResMLP d=256 L=4 WITHOUT terminal LN.
Separate figure (ablation control for Mode 1b).
BP / FA / DFA overlaid, 3 columns = ||h_L||, ||g_L||, acc.
"""
import os, json
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
import numpy as np

REPO_ROOT = "/home/yurenh2/fa"
COLORS = {"BP": "#2166ac", "FA": "#e08214", "DFA": "#b2182b"}

plt.rcParams.update({
    "font.size": 9, "axes.labelsize": 10, "axes.titlesize": 10,
    "legend.fontsize": 8, "xtick.labelsize": 8, "ytick.labelsize": 8,
    "font.family": "serif",
})


def extract_series(log):
    epochs = [e['epoch'] for e in log]
    if 'hidden_norms' in log[0]:
        h_L = [e['hidden_norms'][-1] for e in log]
    else:
        h_L = [1.0] * len(log)
    if 'bp_grad_norms_per_sample_med' in log[0]:
        g_L = [e['bp_grad_norms_per_sample_med'][-1] for e in log]
    elif 'bp_grad_per_sample_l2_med' in log[0]:
        g_L = [e['bp_grad_per_sample_l2_med'][-1] for e in log]
    else:
        g_L = [1.0] * len(log)
    acc = [e['acc_eval'] for e in log]
    return epochs, h_L, g_L, acc


noln = json.load(open(os.path.join(REPO_ROOT, "results/snapshot_no_outln_v1/snapshot_noLN_s42.json")))

# Try canonical FA; fall back to BP/DFA only
fa_path = os.path.join(REPO_ROOT, "results/snapshot_no_outln_v1/snapshot_fa_canonical_noln_s42.json")
has_fa = os.path.exists(fa_path)
if has_fa:
    fa_noln = json.load(open(fa_path))

data = {"BP": extract_series(noln['bp_log']), "DFA": extract_series(noln['dfa_log'])}
if has_fa:
    data["FA"] = extract_series(fa_noln['fa_log'])
methods = ["BP", "FA", "DFA"] if has_fa else ["BP", "DFA"]

fig, axes = plt.subplots(1, 3, figsize=(10.5, 2.8))
fig.subplots_adjust(wspace=0.35, left=0.07, right=0.97, bottom=0.18, top=0.92)

# Column 0: ||h_L||
ax = axes[0]
for m in methods:
    ep, h, g, a = data[m]
    ax.semilogy(ep, h, color=COLORS[m], linewidth=1.5, label=m)
ax.set_ylabel("$\\|h_L\\|_2$")
ax.set_xlabel("Epoch")
ax.set_title("$\\|h_L\\|$  (residual norm)")
ax.legend(loc="center right", fontsize=7)
ax.grid(True, which="major", color="#d0d0d0", linewidth=0.4, linestyle=":")
ax.grid(True, which="minor", color="#e8e8e8", linewidth=0.3, linestyle=":")
ax.set_axisbelow(True)

# Column 1: ||g_L||
ax = axes[1]
for m in methods:
    ep, h, g, a = data[m]
    ax.semilogy(ep, g, color=COLORS[m], linewidth=1.5, label=m)
ax.set_ylabel("$\\|g_L\\|_2$")
ax.set_xlabel("Epoch")
ax.set_title("$\\|g_L\\|$  (BP gradient at $h_L$)")
ax.grid(True, which="major", color="#d0d0d0", linewidth=0.4, linestyle=":")
ax.grid(True, which="minor", color="#e8e8e8", linewidth=0.3, linestyle=":")
ax.set_axisbelow(True)

# Column 2: test acc
ax = axes[2]
for m in methods:
    ep, h, g, a = data[m]
    ax.plot(ep, a, color=COLORS[m], linewidth=1.5, label=m)
ax.set_ylabel("Test accuracy")
ax.set_xlabel("Epoch")
ax.set_title("Test accuracy")
ax.set_ylim(0, 0.7)
ax.grid(True, which="major", color="#d0d0d0", linewidth=0.4, linestyle=":")
ax.set_axisbelow(True)

out = os.path.join(REPO_ROOT, "paper/figures/fig_nooutln_temporal.pdf")
fig.savefig(out, bbox_inches="tight", dpi=300)
fig.savefig(out.replace(".pdf", ".png"), bbox_inches="tight", dpi=200)
print(f"Saved: {out}")
if not has_fa:
    print("NOTE: FA canonical data not yet available — will re-render when ready")