import { screen, type Display } from 'electron';

import type { DisplayInfo } from '../../shared/types/presentationSettings';

export function listDisplayInfos(): DisplayInfo[] {
  const primaryId = screen.getPrimaryDisplay().id;
  return screen.getAllDisplays().map((d) => displayToInfo(d, d.id === primaryId));
}

function displayToInfo(display: Display, isPrimary: boolean): DisplayInfo {
  const label = display.label?.trim() || `Display ${String(display.id)}`;
  return {
    id: display.id,
    label,
    width: display.bounds.width,
    height: display.bounds.height,
    isPrimary,
  };
}

export function resolvePresentationDisplay(displayId: number | null): Display {
  if (displayId != null) {
    const found = screen.getAllDisplays().find((d) => d.id === displayId);
    if (found) return found;
  }
  return screen.getPrimaryDisplay();
}