# All files / lib/reflection policy.ts

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67.64% Branches 23/34
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     // lib/reflection/policy.ts
    // ========================================
    //  Policy Manager with Adjustment Support
    // ========================================

    import { isDryRun, isVerbose } from './flags';
    import {
      POLICY_NAMES,
      type PolicyName,
      type Policy,
      type PolicyState,
      type PolicyAdjustment,
      type FeedbackDecision,
    } from './types';

    // ========================================
    //   Default & Initial State
    // ========================================

    const DEFAULT_POLICIES: Record<string, Policy> = {
      [POLICY_NAMES.THROTTLE_WINDOWS]: { name: POLICY_NAMES.THROTTLE_WINDOWS, value: 100 }, // ms between window opens
      [POLICY_NAMES.DEFER_ANIMATIONS]: { name: POLICY_NAMES.DEFER_ANIMATIONS, value: false }, // Whether to defer non-critical animations
      [POLICY_NAMES.ADJUST_PREFETCH]: { name: POLICY_NAMES.ADJUST_PREFETCH, value: 1.0 }, // Multiplier for prefetching resources (1.0 = normal)
      [POLICY_NAMES.TUNE_FOCUS_TIMEOUT]: { name: POLICY_NAMES.TUNE_FOCUS_TIMEOUT, value: 150 }, // ms for focus-related timeouts
    };

    const createInitialPolicyState = (): PolicyState => ({
      version: 1,
      policies: { ...DEFAULT_POLICIES },
      timestamp: performance.now(),
    });

    // ========================================
    //   Module State
    // ========================================

    let currentState: PolicyState = createInitialPolicyState();
    const history: PolicyState[] = [currentState];

    // ========================================
    //   Public API
    // ========================================

    /**
     * Returns the current policy state.
     */
    export function getPolicyState(): Readonly<PolicyState> {
      return currentState;
    }

    /**
     * Returns the value of a specific policy.
     * @param name The name of the policy to retrieve.
     * @returns The value of the policy.
     */
    export function getPolicyValue(name: PolicyName): number | boolean {
      return currentState.policies[name]?.value ?? DEFAULT_POLICIES[name].value;
    }

    /**
     * Applies a set of adjustments to the current policy state.
     * Creates a new, versioned policy state.
     * Respects DRY_RUN flag.
     *
     * @param adjustments An array of policy adjustments to apply.
     * @returns The new policy state, or the current state if in DRY_RUN mode.
     */
    export function applyPolicyAdjustments(adjustments: PolicyAdjustment[]): PolicyState {
      if (!adjustments?.length) return currentState;

      if (isDryRun()) {
        if (isVerbose()) {
          console.log('[Reflection/Policy] DRY RUN: Would apply adjustments:', adjustments);
        }
        return currentState;
      }

      const newPolicies = { ...currentState.policies };
      let hasChanges = false;

      for (const adj of adjustments) {
        const prevValue = newPolicies[adj.policyName]?.value;
        if (prevValue !== adj.newValue) {
          newPolicies[adj.policyName] = { name: adj.policyName, value: adj.newValue };
          hasChanges = true;

          if (isVerbose()) {
            console.log(
              `[Reflection/Policy] Adjusted ${adj.policyName}: ${prevValue} → ${adj.newValue}`
            );
          }
        }
      }

      if (!hasChanges) return currentState;

      const newState: PolicyState = {
        version: currentState.version + 1,
        policies: newPolicies,
        timestamp: performance.now(),
      };

      currentState = newState;
      history.push(newState);

      if (isVerbose()) {
        console.log(`[Reflection/Policy] Policy state updated to v${newState.version}`, newState);
      }

      return newState;
    }

    /**
     * Applies a single policy change from a feedback decision.
     * This is the bridge called by the Feedback system.
     */
    export function applyPolicyChange(decision: FeedbackDecision): void {
      if (isDryRun()) {
        if (isVerbose()) {
          console.log('[Reflection/Policy] DRY RUN (applyPolicyChange):', decision);
        }
        return;
      }

      const adjustments: PolicyAdjustment[] = [];

      switch (decision.action) {
        case 'THROTTLE_WINDOWS':
          adjustments.push({
            policyName: POLICY_NAMES.THROTTLE_WINDOWS,
            newValue: 500, // ms delay between new windows
          });
          break;

        case 'DEFER_ANIM':
        case 'DEFER_ANIMATIONS':
          adjustments.push({
            policyName: POLICY_NAMES.DEFER_ANIMATIONS,
            newValue: true,
          });
          break;

        case 'ADJUST_PREFETCH':
          adjustments.push({
            policyName: POLICY_NAMES.ADJUST_PREFETCH,
            newValue: 0.5, // reduce prefetch intensity
          });
          break;

        case 'TUNE_FOCUS_TIMEOUT':
          adjustments.push({
            policyName: POLICY_NAMES.TUNE_FOCUS_TIMEOUT,
            newValue: 200, // increase focus timeout
          });
          break;

        default:
          if (isVerbose()) {
            console.warn('[Reflection/Policy] Unknown decision action:', decision.action);
          }
          return;
      }

      applyPolicyAdjustments(adjustments);
    }

    /**
     * Reverts the policy state to a previous version.
     * @param version The version number to revert to. If not provided, reverts to the previous version.
     * @returns The policy state after rollback, or null if the version is invalid.
     */
    export function rollbackPolicy(version?: number): PolicyState | null {
      if (history.length < 2) {
        return null; // Cannot rollback initial state
      }

      const targetVersion = version ?? currentState.version - 1;
      const targetState = history.find((s) => s.version === targetVersion);

      if (!targetState) {
        console.error(
          `[Reflection/Policy] Cannot find policy version ${targetVersion} to roll back to.`
        );
        return null;
      }

      currentState = targetState;

      if (isVerbose()) {
        console.warn(
          `[Reflection/Policy] Rolled back to policy state v${targetState.version}`,
          targetState
        );
      }

      return currentState;
    }

    /**
     * Resets the policy manager to its initial state.
     * (For testing purposes)
     */
    export function _resetPolicyManager(): void {
      currentState = createInitialPolicyState();
      history.length = 0;
      history.push(currentState);
    }