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"""Fuse's combine step in Python: sticker layer from A, effect layer from B. The two
jsons and their trust tokens are copied byte for byte (never touched). The unsigned
overridden_metadata is copied from A but its pack name/publisher are reset to "Fuse"
(the originals name the source pack, in whatever language).
usage: mix.py A.was B.was OUT.was"""
import json, sys, zipfile

a, b, out = (zipfile.ZipFile(sys.argv[1]), zipfile.ZipFile(sys.argv[2]), sys.argv[3])
M, E, T, META = "animation/animation.json", "animation/animation_secondary.json", ".trust_token", "animation/animation.json.overridden_metadata"


def clean_meta(raw):
    try:
        o = json.loads(raw)
    except Exception:
        return raw
    if "sticker-pack-name" in o:
        o["sticker-pack-name"] = "Fuse"
    if "sticker-pack-publisher" in o:
        o["sticker-pack-publisher"] = "Fuse"
    return json.dumps(o).encode()


with zipfile.ZipFile(out, "w", zipfile.ZIP_DEFLATED) as z:
    z.writestr("animation/", b"")
    for name, src in [(M, a), (E, b), (M + T, a), (E + T, b)]:
        z.writestr(name, src.read(name))
    z.writestr(META, clean_meta(a.read(META)))
print(out)