import type { GpoAnalysisSnapshot } from './gpo-ingestion';
import type { GpoPolicyObservation, GpoPolicyValue } from './gpo-policy';
import type { GpoTechnicalPolicyIdentity } from './gpo-policy-identity';
import { gpoTechnicalPolicyIdentityValidationErrors } from './gpo-policy-identity';

export const GPO_POLICY_SNAPSHOT_AGGREGATOR = {
  id: 'gpo-policy-snapshot-aggregation',
  version: '1.0.0'
} as const;

export type EnvironmentProfileScope = 'computer' | 'user' | 'mixed';

export interface EnvironmentProfileContext {
  version: 1;
  id: string;
  kind: 'operating-system' | 'product';
  productFamily: string;
  productVersion: string;
  role: string;
  scope: EnvironmentProfileScope;
}

export interface EnvironmentProfile {
  version: 1;
  id: string;
  projectId: string;
  name: string;
  revision: number;
  supersedesProfileId?: string;
  domainKey?: string;
  contexts: EnvironmentProfileContext[];
  createdAt: string;
}

export interface CreateEnvironmentProfileRequest {
  name: string;
  supersedesProfileId?: string;
  domainKey?: string;
  contexts: Array<Omit<EnvironmentProfileContext, 'version'>>;
}

export type AggregatedPolicyStateStatus = 'configured' | 'deleted' | 'conflicted' | 'indeterminate';

export interface AggregatedPolicyState {
  version: 1;
  id: string;
  aggregationRunId: string;
  identity: GpoTechnicalPolicyIdentity;
  deliveryMechanism: GpoPolicyObservation['deliveryMechanism'];
  status: AggregatedPolicyStateStatus;
  values: GpoPolicyValue[];
  observationIds: string[];
  backupInstanceIds: string[];
  applicableContextIds: string[];
  ordering: 'single-gpo' | 'cross-gpo-identical' | 'cross-gpo-conflict' | 'indeterminate';
  targeting: 'none' | 'unknown';
  completeness: 'complete' | 'partial';
  effectiveState: 'unknown';
  diagnosticCodes: string[];
}

export interface PolicyAggregationReviewHint {
  version: 1;
  id: string;
  code: string;
  identityId?: string;
  observationIds: string[];
  backupInstanceIds: string[];
}

export interface PolicySnapshotAggregationRun {
  version: 1;
  id: string;
  projectId: string;
  environmentProfileId: string;
  sourceAnalysisRunIds: string[];
  snapshotId: string;
  aggregator: typeof GPO_POLICY_SNAPSHOT_AGGREGATOR;
  status: 'complete' | 'partial' | 'blocked';
  stateCount: number;
  conflictCount: number;
  unresolvedIdentityCount: number;
  reviewHintCount: number;
  permitsFindingGeneration: false;
  diagnosticCodes: string[];
  startedAt: string;
  completedAt: string;
}

export interface StoredPolicySnapshotAggregation {
  version: 1;
  run: PolicySnapshotAggregationRun;
  snapshot: GpoAnalysisSnapshot;
  states: AggregatedPolicyState[];
  reviewHints: PolicyAggregationReviewHint[];
}

export interface CreatePolicySnapshotAggregationRequest {
  environmentProfileId: string;
  sourceAnalysisRunIds: string[];
}

function validText(value: unknown): value is string {
  return typeof value === 'string' && Boolean(value.trim()) && value.length <= 32_767 && !/[\u0000-\u001f]/.test(value);
}

function uniqueSorted(values: string[]): boolean {
  return new Set(values).size === values.length
    && values.every((value, index) => index === 0 || values[index - 1].localeCompare(value) < 0);
}

export function environmentProfileValidationErrors(profile: EnvironmentProfile): string[] {
  const errors: string[] = [];
  if (profile.version !== 1 || !validText(profile.id) || !validText(profile.projectId) || !validText(profile.name)
    || !Number.isSafeInteger(profile.revision) || profile.revision < 1 || !Number.isFinite(Date.parse(profile.createdAt))) {
    errors.push('Das Environment Profile besitzt keine gueltige Identitaet, Revision oder Zeitangabe.');
  }
  if (profile.supersedesProfileId === profile.id) errors.push('Ein Environment Profile darf sich nicht selbst ersetzen.');
  if (profile.domainKey !== undefined && !validText(profile.domainKey)) errors.push('Der optionale Domaenenschluessel ist ungueltig.');
  const contexts = Array.isArray(profile.contexts) ? profile.contexts : [];
  if (!contexts.length || !contexts.some(context => context?.kind === 'operating-system')) {
    errors.push('Ein Environment Profile benoetigt mindestens einen Betriebssystemkontext.');
  }
  const contextIds = new Set<string>();
  for (const context of contexts) {
    if (!context || context.version !== 1 || !['operating-system', 'product'].includes(context.kind)
      || !['computer', 'user', 'mixed'].includes(context.scope)
      || !validText(context.id) || !validText(context.productFamily)
      || !validText(context.productVersion) || !validText(context.role) || contextIds.has(context.id)) {
      errors.push('Das Environment Profile enthaelt einen ungueltigen oder doppelten Produktkontext.');
    }
    contextIds.add(context.id);
  }
  return [...new Set(errors)];
}

export function storedPolicySnapshotAggregationValidationErrors(record: StoredPolicySnapshotAggregation): string[] {
  const errors: string[] = [];
  const { run, snapshot, states, reviewHints } = record;
  if (record.version !== 1 || run.version !== 1 || !validText(run.id) || !validText(run.projectId)
    || !validText(run.environmentProfileId) || !validText(run.snapshotId) || run.snapshotId !== snapshot.id
    || snapshot.projectId !== run.projectId) {
    errors.push('Der Policy-Snapshot-Aggregationslauf besitzt ungueltige Referenzen.');
  }
  if (run.aggregator.id !== GPO_POLICY_SNAPSHOT_AGGREGATOR.id
    || run.aggregator.version !== GPO_POLICY_SNAPSHOT_AGGREGATOR.version) {
    errors.push('Der Policy-Snapshot-Aggregationslauf benoetigt versionierte Aggregatorprovenienz.');
  }
  if (!run.sourceAnalysisRunIds.length || !uniqueSorted(run.sourceAnalysisRunIds)) {
    errors.push('Quellanalyselaeufe muessen eindeutig und deterministisch sortiert sein.');
  }
  if (![run.stateCount, run.conflictCount, run.unresolvedIdentityCount, run.reviewHintCount]
    .every(value => Number.isSafeInteger(value) && value >= 0)
    || run.stateCount !== states.length || run.conflictCount !== states.filter(state => state.status === 'conflicted').length
    || run.reviewHintCount !== reviewHints.length || run.permitsFindingGeneration !== false) {
    errors.push('Die Zaehler oder Finding-Grenze des Policy-Snapshot-Aggregationslaufs sind inkonsistent.');
  }
  if (![run.startedAt, run.completedAt].every(value => Number.isFinite(Date.parse(value)))
    || Date.parse(run.completedAt) < Date.parse(run.startedAt)) {
    errors.push('Die Laufzeit des Policy-Snapshot-Aggregationslaufs ist ungueltig.');
  }
  const stateIds = new Set<string>();
  const stateKeys = new Set<string>();
  for (const state of states) {
    const key = state.identity.id + '\0' + state.deliveryMechanism;
    if (state.version !== 1 || !validText(state.id) || state.aggregationRunId !== run.id
      || stateIds.has(state.id) || stateKeys.has(key) || !state.values.length
      || !uniqueSorted(state.observationIds) || !uniqueSorted(state.backupInstanceIds)
      || !uniqueSorted(state.applicableContextIds) || state.effectiveState !== 'unknown') {
      errors.push('Ein aggregierter Policyzustand ist ungueltig oder doppelt.');
    }
    stateIds.add(state.id);
    stateKeys.add(key);
    errors.push(...gpoTechnicalPolicyIdentityValidationErrors(state.identity));
  }
  const hintIds = new Set<string>();
  for (const hint of reviewHints) {
    if (hint.version !== 1 || !validText(hint.id) || !validText(hint.code) || hintIds.has(hint.id)
      || !uniqueSorted(hint.observationIds) || !uniqueSorted(hint.backupInstanceIds)) {
      errors.push('Ein Review-Hinweis der Policyaggregation ist ungueltig oder doppelt.');
    }
    hintIds.add(hint.id);
  }
  return [...new Set(errors)];
}