const SETTINGS_KEY = 'decidron-simulator-settings';

export const LAYOUT_MODES = {
  RANDOM: 'random',
  FIXED_SEED: 'fixed-seed',
  EXPLICIT: 'explicit',
};

/** Right-column panels in fixed top-to-bottom order. */
export const PANEL_KEYS = ['sensorInput', 'commands', 'results', 'stats'];

export const PANEL_LABELS = {
  sensorInput: 'Sensor Input',
  commands: 'Processing Commands',
  results: 'Latest Run Results',
  stats: 'Performance Statistics',
};

export const DEFAULT_SETTINGS = {
  layoutMode: LAYOUT_MODES.RANDOM,
  panels: {
    sensorInput: true,
    commands: true,
    results: true,
    stats: true,
  },
};

export function loadSettings() {
  try {
    const raw = localStorage.getItem(SETTINGS_KEY);
    if (!raw) return { ...DEFAULT_SETTINGS, panels: { ...DEFAULT_SETTINGS.panels } };
    const parsed = JSON.parse(raw);
    return {
      layoutMode: Object.values(LAYOUT_MODES).includes(parsed.layoutMode)
        ? parsed.layoutMode
        : DEFAULT_SETTINGS.layoutMode,
      panels: {
        ...DEFAULT_SETTINGS.panels,
        ...(parsed.panels || {}),
      },
    };
  } catch {
    return { ...DEFAULT_SETTINGS, panels: { ...DEFAULT_SETTINGS.panels } };
  }
}

export function saveSettings(settings) {
  localStorage.setItem(SETTINGS_KEY, JSON.stringify(settings));
}