import {
  ParameterConfig,
  EmptyParameterConfiguration,
  ParameterConfiguration,
} from './ParameterConfig';
import type { ReactNativeFeatureFlagDecision } from '../client';
import type { DecisionReason } from './Decision';

/**
 * An object that contains the decided flag and the reason for the feature flag decision.
 */
export class FeatureFlagDecision implements ParameterConfig {
  isOn: boolean;
  reason: DecisionReason;
  config: ParameterConfig;

  constructor(isOn: boolean, reason: DecisionReason, config: ParameterConfig) {
    this.isOn = isOn;
    this.reason = reason;
    this.config = config;
  }

  static of(
    isOn: boolean,
    reason: DecisionReason,
    config: ParameterConfig = new EmptyParameterConfiguration()
  ): FeatureFlagDecision {
    return new FeatureFlagDecision(isOn, reason, config);
  }

  static withReactNativeFeatureFlagDecision(
    decision: ReactNativeFeatureFlagDecision
  ): FeatureFlagDecision {
    return new FeatureFlagDecision(
      decision.isOn,
      decision.reason,
      new ParameterConfiguration(decision.parameters)
    );
  }

  static on(
    reason: DecisionReason,
    config: ParameterConfig = new EmptyParameterConfiguration()
  ): FeatureFlagDecision {
    return new FeatureFlagDecision(true, reason, config);
  }

  static off(
    reason: DecisionReason,
    config: ParameterConfig = new EmptyParameterConfiguration()
  ): FeatureFlagDecision {
    return new FeatureFlagDecision(false, reason, config);
  }

  getSync(
    key: string,
    defaultValue: string | number | boolean
  ): string | number | boolean {
    return this.config.getSync(key, defaultValue);
  }
}