import sys
import numpy as np

sys.path.insert(0, 'tools')
from viz_theme import apply_monochrome, save_svg, load_csv

apply_monochrome()
import matplotlib.pyplot as plt

def read_data(rows):
    ops = []
    m512 = []; m512_err = []
    m768 = []; m768_err = []
    m1024 = []; m1024_err = []
    for row in rows:
        ops.append(row['op'])
        m512.append(float(row['m512_sp']))
        m512_err.append([float(row['m512_elo']), float(row['m512_ehi'])])
        m768.append(float(row['m768_sp']))
        m768_err.append([float(row['m768_elo']), float(row['m768_ehi'])])
        m1024.append(float(row['m1024_sp']))
        m1024_err.append([float(row['m1024_elo']), float(row['m1024_ehi'])])
        
    m512_err = np.array(m512_err).T
    m768_err = np.array(m768_err).T
    m1024_err = np.array(m1024_err).T
    return ops, m512, m512_err, m768, m768_err, m1024, m1024_err

DATA = "kem_level.csv"
ops, m512, m512_err, m768, m768_err, m1024, m1024_err = read_data(load_csv(DATA))

fig, ax = plt.subplots(figsize=(8, 4))
bar_width = 0.25
colors = ['#333333', '#777777', '#bbbbbb']
labels = ['ML-KEM-512', 'ML-KEM-768', 'ML-KEM-1024']

x = np.arange(len(ops))
ax.bar(x - bar_width, m512, bar_width, label=labels[0], color=colors[0], yerr=m512_err, edgecolor='none')
ax.bar(x, m768, bar_width, label=labels[1], color=colors[1], yerr=m768_err, edgecolor='none')
ax.bar(x + bar_width, m1024, bar_width, label=labels[2], color=colors[2], yerr=m1024_err, edgecolor='none')

ax.set_xticks(x)
ax.set_xticklabels(ops)

ax.set_ylabel("Speedup ref $\\to$ avx2 ($\\times$)")
ax.set_ylim(bottom=0, top=9)

ax.legend(loc='upper left', frameon=False, fontsize='small')

save_svg(
    fig,
    alt=(
        "Grouped bar chart of end-to-end AVX2 speedup for the three ML-KEM "
        "operations, at three parameter sets."
    ),
    desc=(
        "Key generation, encapsulation and decapsulation all land between "
        "roughly 5.4 and 7.1 times faster than the scalar reference, a much "
        "narrower band and a much smaller factor than the per-operation "
        "speedups elsewhere in the essay, because the arithmetic AVX2 "
        "accelerates is only part of the whole operation. Confidence "
        "intervals are too small to see at this scale."
    ),
)