#!/usr/bin/env python3
"""Jitter wax density per cell so neighbouring cells pick different sprite
frames — without it, equal-density cells draw the identical blob and the field
reads as a regular grid."""
import os, struct, glob, random

for i, m in enumerate(sorted(glob.glob(os.path.join(os.path.dirname(__file__), '..', 'mods', 'vinylgod', 'maps', '*')))):
    p = os.path.join(m, 'map.bin')
    if not os.path.exists(p):
        continue
    d = bytearray(open(p, 'rb').read())
    w, h = struct.unpack_from('<HH', d, 1)
    _, _, res_off = struct.unpack_from('<III', d, 5)
    rng = random.Random(7000 + i)
    n = 0
    for x in range(w):
        for y in range(h):
            o = res_off + 2 * (x * h + y)
            if d[o]:
                d[o + 1] = max(1, min(12, d[o + 1] + rng.randint(-3, 3)))
                n += 1
    open(p, 'wb').write(d)
    print(f'{os.path.basename(m):14s} jittered {n} wax cells')