"""
On-device test for Presets.fill_n() using mpremote.

Usage (from pico/ dir or project root with adjusted paths):

    mpremote connect <device> cp src/*.py :
    mpremote connect <device> cp src/patterns/*.py :patterns
    mpremote connect <device> cp lib/*.py :
    mpremote connect <device> cp test/test_fill_n.py :
    mpremote connect <device> run test_fill_n.py

This script:
  - Instantiates Presets
  - Calls fill_n() with a simple range
  - Lets you visually confirm that all strips show the same proportional segment
    and that equal-length strip pairs have identical lit indices.
"""

from presets import Presets


def main():
    presets = Presets()
    presets.load()

    # Choose a simple test range on the reference strip (strip 0).
    ref_len = presets.strip_length(0)
    if ref_len <= 0:
        print("No strips or invalid length; aborting fill_n test.")
        return

    # Use a central segment so it's easy to see.
    start = ref_len // 4
    end = 3 * ref_len // 4
    print("Running fill_n test from", start, "to", end, "on reference strip 0.")

    color = (0, 50, 0)  # dim green

    # First, clear everything
    for strip in presets.strips:
        strip.fill((0, 0, 0))
        strip.show()

    # Apply fill_n, which will use scale() internally.
    presets.fill_n(color, start, end)

    print("fill_n test applied; visually inspect strips.")


if __name__ == "__main__":
    main()