import type { FindCursor, Db } from 'mongodb';
import type { NextFunction, Request, Response, Router } from 'express';
import type { EventEmitter } from 'events';
import type { Datastore } from '../sdk';
import type { MongoDbConnector } from '@getanthill/mongodb-connector';
import type Ajv from 'ajv';
import type { Models } from '../models';
import type MQTTClient from '../services/mqtt';
import type AMQPClient from '../services/amqp';
import type FullyHomomorphicEncryptionClient from '../services/fhe';
import type Authz from '../services/authz';
import type { envConfig } from '../config';

import * as metrics from '../constants/metrics';

import * as telemetry from '@getanthill/telemetry';

export * as authorizations from './authorizations';

export type Source = 'entities' | 'events';

export type AccessLevel = 'read' | 'decrypt' | 'write' | 'admin';
export interface Access {
  id: string;
  token: string;
  level: AccessLevel;
}

export interface Event {
  type: string;
  v?: string;
  [x: string]: any;
}

export interface ResponseError extends Error {
  name: string;
  status?: number;
  details?: object[];
}

export type Telemetry = typeof telemetry;

export type Reducer = (state: object, event: Event, validator?: Ajv) => object;

export type DatastoreConfig = typeof envConfig;

export type AnyObject = { [key: string]: any };

export type Any = null | number | string | boolean | AnyObject | AnyObject[];

export interface Services {
  config: DatastoreConfig;
  telemetry: Telemetry;
  metrics: typeof metrics;
  signals: EventEmitter;
  api: (services: Services) => Promise<Router>;
  events: (services: Services) => Promise<void>;
  mongodb: MongoDbConnector;
  mqtt: MQTTClient;
  amqp: AMQPClient;
  fhe: FullyHomomorphicEncryptionClient;
  models: Models;
  authz: Authz;
  datastores: Map<string, Datastore>;
}

export interface ApiErrorsObject {
  message?: {
    [key: string]:
      | number
      | ((
          err: Error,
          req: Request,
          res: Response,
          next: NextFunction,
        ) => Promise<number>);
  };
  code?: {
    [key: string]:
      | number
      | ((
          err: Error,
          req: Request,
          res: Response,
          next: NextFunction,
        ) => Promise<number>);
  };
}

export type ProcessDestroySignal =
  | 'SIGTERM'
  | 'SIGINT'
  | 'uncaughtException'
  | 'unhandledRejection';

export interface ModelSchema {
  model?: any;
  events?: any;
}

export interface ModelIndex {
  collection: string;
  fields: object | { [key: string]: string | number };
  opts: {
    name?: string;
    [key: string]: any;
  };
}

export interface Processing {
  name: string;
  field: string;
  purpose: string;
  persons: string[];
  recipients: string[];
  duration_in_seconds: number;
  tokens?: string[];
  security_policies?: string;
  owner?: {
    name: string;
    email?: string;
    phone?: string;
    url?: string;
    location?: {
      address?: string;
      post_code?: string;
      city?: string;
      country_code?: string;
      region?: string;
    };
  };
}

export interface ModelConfig {
  name: string;
  correlation_field: string;
  schema: ModelSchema;
  // ---
  db?: string;
  is_enabled?: boolean;
  description?: string;
  retry_duration?: number;
  indexes?: ModelIndex[];
  encrypted_fields?: string[];
  links?: {
    [key: string]: string;
  };
  // Model options:
  with_default_events?: boolean;
  with_global_version?: boolean;
  // Fully Homomorphic logic
  with_fully_homomorphic_encryption?: boolean;
  fhe_public_key_field?: string;
  // Blockchain logic
  with_blockchain_hash?: boolean;
  current_hash_field?: string;
  previous_hash_field?: string;
  nonce_field?: string;
  blockchain_hash_difficulty?: number;
  blockchain_hash_genesis?: string;
  // Performance options:
  must_wait_state_persistence?: boolean;
  [key: string]: any;
  // Processings
  processings?: Processing[];
}

export interface DatastoreImportLink {
  model: string;
  id?: string;
  is_idempotency_condition?: boolean;
  idempotency?: {
    [key: string]: any;
  };
  map:
    | string
    | {
        [key: string]: string;
      };
}

export interface DatastoreImportFixture {
  model: string;
  id: string;
  idempotency: {
    [key: string]: any;
  };
  omit_on_update?: string[];
  links?: DatastoreImportLink[];
  entity: any;
}

export interface HandlerFunc {
  (
    obj: any,
    metadata: {
      handlerId?: string;
      path?: string;
      datastore?: string;
      model?: string;
      source?: Source;
      raw?: boolean;
    },
  ): Promise<any>;
}

export interface StartFunc {
  (): Promise<RunnerServices>;
}

export interface StopFunc {
  (): Promise<void>;
}

export interface RunnerServices {
  telemetry?: Telemetry;
  datastores: {
    [key: string]: Datastore;
  };
  [key: string]: any;
}

export interface RunnerTrigger {
  datastore?: string;
  model?: string;
  source?: Source;
  raw?: boolean;
  query?: object;
  headers?: object;
  queryAsJSONSchema?: boolean;
  processing?: {
    correlation_field: string;
    field: string;
    states: [string, string, string?, string?];
  };
}

export interface HandlerConfig extends RunnerTrigger {
  triggers?: RunnerTrigger[];
  start: StartFunc;
  stop: StopFunc;
  handler: HandlerFunc;
}

export interface HandlerBuilderFunc {
  (url?: URL): Promise<HandlerConfig>;
}

export type EntityState = any;

export type ModelConstructor<T> = new (
  services: Services,
  correlationId?: string,
  opts?: Partial<{
    retryDuration: number;
    forcePrimary: boolean;
  }>,
) => T;

export interface HandleOptions {
  mustEncrypt?: boolean;
  imperativeVersion?: number;
  isReadonly?: string;
  mustWaitStatePersistence?: boolean;
  retryDuration?: number;
}

export interface ModelInstance {
  state: EntityState;
  mongodb: MongoDbConnector;
  config: {
    retryDuration: number;
    forcePrimary: boolean;
  };
  correlationId: string;
  latestHandledEvents: Event[];

  handleWithRetry(
    handler: () => Event[],
    retryDuration: number,
    storeStateErrorHandler: (...args: any) => void,
    handleOptions?: HandleOptions,
  ): Promise<any>;
  apply(
    eventType: string,
    data: AnyObject,
    handleOptions?: HandleOptions,
    v?: string,
  ): Promise<ModelInstance>;
  getState(): Promise<EntityState>;
  patch(data: AnyObject, handleOptions?: HandleOptions): Promise<ModelInstance>;
  update(
    data: AnyObject,
    handleOptions?: HandleOptions,
  ): Promise<ModelInstance>;
  create(
    data: AnyObject,
    handleOptions?: HandleOptions,
  ): Promise<ModelInstance>;
  upsert(
    data: AnyObject,
    handleOptions?: HandleOptions,
  ): Promise<ModelInstance>;
  getEvents(version?: number): FindCursor<any>;
  restore(version: number): Promise<ModelInstance>;
  rollback(events: Event[], updatedState: EntityState): Promise<ModelInstance>;
  createSnapshot(): Promise<EntityState>;
  getStateAtVersion(version: number, mustThrow?: boolean): Promise<EntityState>;
  getNextVersion(): Promise<number>;
  archive(): Promise<ModelInstance>;
  unarchive(): Promise<ModelInstance>;
  delete(): Promise<void>;
}
export interface ModelStatic {
  IV_LENGTH: number;
  RETRY_ERRORS: string[];
  encryptionKeys: any[] | null;
  hashedEncryptionKeys: any[] | null;

  getSchema(): ModelSchema;
  getModelConfig(): ModelConfig;
  getOriginalSchema(): any;
  getCorrelationField(): string;
  getCollectionName(): string;
  db(mongodb: MongoDbConnector, isRead?: boolean): Db;
  explain(cursor: any, query: any): void;
  count(mongodb: MongoDbConnector, query: any): Promise<number>;
  find(mongodb: MongoDbConnector, query: any, opts?: any): FindCursor<any>;
  isEncryptedField(field: string): boolean;
  getStatesCollection(db: any): any;
  getEventsCollection(db: any): any;
  getSnapshotsCollection(db: any): any;
  getEncryptionKeys(): string[];
  getHashesEncryptionKeys(): string[];
  getEligibleKeys(keys: string[]): string[];
  getRequiredIndexes(): {
    [x: string]: (
      | object
      | {
          version: number;
          name: string;
          unique?: boolean;
        }
    )[][];
  };
  hashValue(data: any): string;
  encrypt(
    data: any,
    additionalEncryptedFields?: string[],
    keys?: string[],
    hashes?: string[],
    algorithm?: string,
  ): any;
  decrypt(
    data: any,
    additionalEncryptedFields?: string[],
    keys?: string[],
    hashedKeys?: string[],
  ): any;
  getIsReadonlyProperty(modelConfig?: ModelConfig): any;
  getIsArchivedProperty(modelConfig?: ModelConfig): any;
  getIsDeletedProperty(modelConfig?: ModelConfig): any;
  snapshot(
    mongodb: MongoDbConnector,
    correlationId: string,
    options?: {
      version?: number;
      removePastEvents?: boolean;
    },
  ): Promise<any>;
}

export type GenericType = ModelConstructor<ModelInstance> & ModelStatic;

export interface Links {
  [key: string]: { path: string; model: GenericType };
}

export interface BuiltLinks {
  [key: string]: { operationId: string; parameters: { [key: string]: string } };
}

export interface SpecFragment {
  openapi: string;
  servers: Array<{
    description: 'API Server';
    url: '/api';
    [key: string]: any;
  }>;
  info: {
    title: string;
    description: string;
    version: string;
    license: {
      name: string;
      url: string;
      [key: string]: any;
    };
    [key: string]: any;
  };
  tags: Array<{
    name: string;
    description: string;
  }>;
  components: any;
  paths: any;
}
export interface Ctx {
  telemetry: Telemetry;
  entities?: Map<string, any>;
  projections?: any[];
  data?: {
    config: {
      datastores: {
        [key: string]: any;
      };
      imports?: {
        date: any;
      };
      runner_params: any;
      exit_timeout: any;
    };
    events: any[];
    imports: any;
    projections: any[];
    assertions: any[];
  };
  instances?: any;
  [key: string]: any;
}