/**
 * TUI theme — colors that vary between dark and light terminal
 * backgrounds. Pulled into one place so a future theme picker, env
 * var, or auto-detection only needs to swap the active object.
 *
 * Severity colors (red/yellow/green) are kept theme-agnostic — those
 * are ANSI named colors that respect the user's terminal palette and
 * read correctly on both dark and light backgrounds.
 *
 * Selected via `--theme=dark|light` on `celilo system audit --tui`.
 * Default: `dark`. We don't auto-detect terminal background — the
 * standard probe (`COLORFGBG` env var, or OSC 11) is unreliable
 * across terminals, and an explicit flag is more honest than a guess
 * that's right 70% of the time.
 */

export type ThemeName = 'dark' | 'light';

export interface Theme {
  /**
   * Dialog background. Should contrast strongly with the typical
   * terminal background on this theme — pure black on dark themes,
   * pure white on light themes.
   */
  dialogBg: 'black' | 'white';
  /** Foreground text color inside dialogs. Inverse of dialogBg. */
  dialogFg: 'white' | 'black';
}

const DARK: Theme = {
  dialogBg: 'black',
  dialogFg: 'white',
};

const LIGHT: Theme = {
  dialogBg: 'white',
  dialogFg: 'black',
};

export function getTheme(name: ThemeName | undefined): Theme {
  return name === 'light' ? LIGHT : DARK;
}