"""Synthesize a small RGB example image and bake it into APP_TMP_DIR/example.tif.

Run at Docker build time (`python -m scripts.make_example`). The example doubles
as the converter's input for the UI, smoke test, and validator.
"""
from __future__ import annotations

import numpy as np
import tifffile

from core.io import APP_TMP_DIR, register_protected


def make_rgb(h: int = 128, w: int = 128) -> np.ndarray:
    yy, xx = np.mgrid[0:h, 0:w].astype(np.float32)
    r = (np.sin(xx / 12.0) * 0.5 + 0.5)
    g = (np.cos(yy / 16.0) * 0.5 + 0.5)
    b = ((xx + yy) / (h + w))
    rgb = np.stack([r, g, b], axis=-1)
    return (np.clip(rgb, 0, 1) * 255).astype(np.uint8)


def main() -> int:
    out = APP_TMP_DIR / "example.tif"
    rgb = make_rgb()
    tifffile.imwrite(out, rgb)
    register_protected(out)  # survive the build process's atexit temp wipe
    print(f"[make_example] wrote {out} {rgb.shape}")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())