import type { NeoPixel } from "mikro/neopixel";
import { ok } from "mikro/result";
import { sleep } from "mikro/sleep";

import { hsv } from "../color.js";

/** Rainbow: rotate a full spectrum around the ring */
export async function rainbow(pixels: NeoPixel, numLeds: number, brightness: number, ms: number) {
  const end = Date.now() + ms;
  let offset = 0;
  while (Date.now() < end) {
    for (let i = 0; i < numLeds; i++) {
      const hue = ((i * 360) / numLeds + offset) % 360;
      const [r, g, b] = hsv(hue, 1, brightness);
      const pixelResult = pixels.setPixel(i, r, g, b);
      if (!pixelResult.ok) return pixelResult;
    }
    const showResult = pixels.show();
    if (!showResult.ok) return showResult;
    offset = (offset + 5) % 360;
    await sleep(30);
  }
  return ok();
}