/**
 * Feature Flags — enable features without new releases
 *
 * Pilot 001-010: Control which modules are visible.
 */

export type FeatureFlag =
  | 'ENABLE_REPLAY'
  | 'ENABLE_DATASET_EXPLORER'
  | 'ENABLE_MODEL_TRAINING'
  | 'ENABLE_HOTSPOTS'
  | 'ENABLE_ECONOMIC_ENGINE'
  | 'ENABLE_DEVELOPER_MODE';

export interface FeatureFlags {
  readonly flags: Record<FeatureFlag, boolean>;
}

export const DefaultFeatureFlags: FeatureFlags = {
  flags: {
    ENABLE_REPLAY: false,
    ENABLE_DATASET_EXPLORER: true,
    ENABLE_MODEL_TRAINING: false,
    ENABLE_HOTSPOTS: false,
    ENABLE_ECONOMIC_ENGINE: false,
    ENABLE_DEVELOPER_MODE: false,
  },
};

export function isEnabled(flags: FeatureFlags, flag: FeatureFlag): boolean {
  return flags.flags[flag] ?? false;
}

export function enable(flags: FeatureFlags, flag: FeatureFlag): FeatureFlags {
  return {
    flags: {
      ...flags.flags,
      [flag]: true,
    },
  };
}

export function disable(flags: FeatureFlags, flag: FeatureFlag): FeatureFlags {
  return {
    flags: {
      ...flags.flags,
      [flag]: false,
    },
  };
}