import json

import numpy as np

import pipeline.build as build
from pipeline.movie import read_movie


def test_build_tiny_movie(tmp_path, monkeypatch):
    frames = [np.zeros((64, 64), dtype=bool) for _ in range(3)]
    frames[1][8:24, 8:24] = True
    monkeypatch.setattr(build, "extract_binary", lambda *a, **k: iter(frames))
    monkeypatch.setattr(build, "vectorize_frame", lambda m, p: m)
    out = tmp_path / "data"
    manifest = build.build_movie("unused.mp4", str(out),
                                 {"duration": 3, "fps": 60})
    header, recs = read_movie(str(out / "movie.bin"))
    assert header.frame_count == 3
    assert len(recs) == 3
    assert (out / "manifest.json").exists()
    assert json.loads((out / "manifest.json").read_text())["frame_count"] == 3