import {ClaimActionType, IPromotionRoles, IRequiredClaim} from '@essential-projects/core_contracts';
import {IPromoteDecorator, MetadataType} from '@essential-projects/metadata_contracts';
import {MetadataProvider} from './../provider';

export function promote(roles: IPromotionRoles, namespace?: string): IPromoteDecorator {

  if (!roles || !roles.roles || roles.roles.length === 0) {
    throw new Error('roles for promotion are missing');
  }

  // if this is decorating a class, typeof args[0] is the type of the decorated class
  return function promoteFactory(...args: Array<any>): typeof args[0] | void | PropertyDescriptor {

    switch (args.length) {
      case 1:
        return classPromote.apply(this, [args[0], roles, namespace]);
      case 2:
        return propertyPromote.apply(this, [args[0], args[1], roles, namespace]);
      case 3:
        if (typeof args[2] === 'number') {
          // this is a parameter descriptor
          // those should not support promotions
        }

        return methodPromote.apply(this, [args[0], args[1], args[2], roles, namespace]);
      default:
        throw new Error('Decorators are not valid here!');
    }
  };
}

function classPromote(target: any, roles: IPromotionRoles, namespace?: string): typeof target {

  const type: string = target.prototype ? target.prototype.constructor.name : target.constructor.name;

  MetadataProvider.setForType(MetadataType.Promotion, roles, namespace, type);

  return target;
}

function propertyPromote(target: any, key: string, roles: IPromotionRoles, namespace?: string): void {

  const type: string = target.prototype ? target.prototype.constructor.name : target.constructor.name;

  MetadataProvider.setForType(MetadataType.Promotion, roles, namespace, type, key);
}

function methodPromote(target: any, key: string, descriptor: any, roles: IPromotionRoles, namespace?: string): PropertyDescriptor {

  const type: string = target.prototype ? target.prototype.constructor.name : target.constructor.name;

  MetadataProvider.setForType(MetadataType.Promotion, roles, namespace, type, key);

  return descriptor;
}