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import { Middleware } from './compose';import { copyToSelf, copyProperties } from './utils';
export const HOOKS: string = Symbol('@feathersjs/hooks') as any;
export type HookContextData = { [key: string]: any };
/** * The base hook context. */export class BaseHookContext<C = any> {  self?: C;  [key: string]: any;
  constructor (data: HookContextData = {}) {    Object.assign(this, data);  }}
export interface HookContext<T = any, C = any> extends BaseHookContext<C> {  result?: T;  method?: string;  arguments: any[];}
export type HookContextConstructor = new (data?: { [key: string]: any }) => BaseHookContext;
export type HookDefaultsInitializer = (self?: any, args?: any[], context?: HookContext) => HookContextData;
export class HookManager {  _parent?: this|null = null;  _params: string[]|null = null;  _middleware: Middleware[]|null = null;  _props: HookContextData|null = null;  _defaults?: HookDefaultsInitializer;
  parent (parent: this|null) {    this._parent = parent;
    return this;  }
  middleware (middleware?: Middleware[]) {    this._middleware = middleware?.length ? middleware : null;
    return this;  }
  getMiddleware (): Middleware[]|null {    const previous = this._parent?.getMiddleware();
    if (previous && this._middleware) {      return previous.concat(this._middleware);    }
    return previous || this._middleware;  }
  collectMiddleware (self: any, _args: any[]): Middleware[] {    const otherMiddleware = getMiddleware(self);    const middleware = this.getMiddleware();
    if (otherMiddleware && middleware) {      return otherMiddleware.concat(middleware);    }
    return otherMiddleware || middleware || [];  }
  props (props: HookContextData) {    if (!this._props) {      this._props = {};    }
    copyProperties(this._props, props);
    return this;  }
  getProps (): HookContextData|null {    const previous = this._parent?.getProps();
    if (previous && this._props) {      return copyProperties({}, previous, this._props);    }
    return previous || this._props || null;  }
  params (...params: string[]) {    this._params = params;
    return this;  }
  getParams (): string[]|null {    const previous = this._parent?.getParams();
    if (previous && this._params) {      return previous.concat(this._params);    }
    return previous || this._params;  }
  defaults (defaults: HookDefaultsInitializer) {    this._defaults = defaults;
    return this;  }
  getDefaults (self: any, args: any[], context: HookContext): HookContextData|null {    const defaults = typeof this._defaults === 'function' ? this._defaults(self, args, context) : null;    const previous = this._parent?.getDefaults(self, args, context);
    if (previous && defaults) {      return Object.assign({}, previous, defaults);    }
    return previous || defaults;  }
  getContextClass (Base: HookContextConstructor = BaseHookContext): HookContextConstructor {    const ContextClass = class ContextClass extends Base {      constructor (data: any) {        super(data);
        copyToSelf(this);      }    };    const params = this.getParams();    const props = this.getProps();
    if (params) {      params.forEach((name, index) => {        if (props?.[name] !== undefined) {          throw new Error(`Hooks can not have a property and param named '${name}'. Use .defaults instead.`);        }
        Object.defineProperty(ContextClass.prototype, name, {          enumerable: true,          get () {            return this?.arguments[index];          },          set (value: any) {            this.arguments[index] = value;          }        });      });    }
    if (props) {      copyProperties(ContextClass.prototype, props);    }
    return ContextClass;  }
  initializeContext (self: any, args: any[], context: HookContext): HookContext {    const ctx = this._parent ? this._parent.initializeContext(self, args, context) : context;    const defaults = this.getDefaults(self, args, ctx);
    if (self) {      ctx.self = self;    }
    ctx.arguments = args;
    if (defaults) {      for (const name of Object.keys(defaults)) {        if (ctx[name] === undefined) {          ctx[name] = defaults[name];        }      }    }
    return ctx;  }}
export type HookOptions = HookManager|Middleware[]|null;
export function convertOptions (options: HookOptions = null) {  if (!options) {    return new HookManager()  }
  return Array.isArray(options) ? new HookManager().middleware(options) : options;}
export function getManager (target: any): HookManager|null {  return (target && target[HOOKS]) || null;}
export function setManager<T> (target: T, manager: HookManager) {  const parent = getManager(target);
  (target as any)[HOOKS] = manager.parent(parent);
  return target;}
export function getMiddleware (target: any): Middleware[]|null {  const manager = getManager(target);
  return manager ? manager.getMiddleware() : null;}
export function setMiddleware<T> (target: T, middleware: Middleware[]) {  const manager = new HookManager().middleware(middleware);
  return setManager(target, manager);}