import { bash, dependencies, sh } from "lib/utils";

if (!dependencies("brightnessctl")) App.quit();

const get = (args: string) => Number(Utils.exec(`brightnessctl ${args}`));
const screen = await bash`ls -w1 /sys/class/backlight | head -1`;
const kbd = await bash`ls -w1 /sys/class/leds | head -1`;

class Brightness extends Service {
  static {
    Service.register(
      this,
      {},
      {
        screen: ["float", "rw"],
        kbd: ["int", "rw"],
      },
    );
  }

  #kbdMax = get(`--device ${kbd} max`);
  #kbd = get(`--device ${kbd} get`);
  #screenMax = get("max");
  #screen = get("get") / get("max");

  get kbd() {
    return this.#kbd;
  }
  get screen() {
    return this.#screen;
  }

  set kbd(value) {
    if (value < 0 || value > this.#kbdMax) return;

    sh(`brightnessctl -d ${kbd} s ${value} -q`).then(() => {
      this.#kbd = value;
      this.changed("kbd");
    });
  }

  set screen(percent) {
    if (percent < 0) percent = 0;

    if (percent > 1) percent = 1;

    sh(
      `gbmonctl --prop brightness -val ${Math.min(
        Math.max(Math.floor(percent * 100), 0),
        100,
      )}`,
    ).then(() => {
      this.#screen = percent;
      this.changed("screen");
    });
  }

  constructor() {
    super();

    const screenPath = `/sys/class/backlight/${screen}/brightness`;
    const kbdPath = `/sys/class/leds/${kbd}/brightness`;

    Utils.monitorFile(screenPath, async (f) => {
      const v = await Utils.readFileAsync(f);
      this.#screen = Number(v) / this.#screenMax;
      this.changed("screen");
    });

    Utils.monitorFile(kbdPath, async (f) => {
      const v = await Utils.readFileAsync(f);
      this.#kbd = Number(v) / this.#kbdMax;
      this.changed("kbd");
    });
  }
}

export default new Brightness();