import {Service} from '@e22m4u/js-service';
import {projectData} from './project-data.js';
import {ProjectionSchemaRegistry} from './projection-schema-registry.js';

/**
 * Data projector.
 */
export class DataProjector extends Service {
  /**
   * Define schema.
   *
   * @param {object} schemaDef
   * @returns {this}
   */
  defineSchema(schemaDef) {
    this.getService(ProjectionSchemaRegistry).defineSchema(schemaDef);
    return this;
  }

  /**
   * Project.
   *
   * @param {object|Function|string} schema
   * @param {object|object[]|*} data
   * @param {object} [options]
   * @returns {*}
   */
  project(schema, data, options) {
    const registry = this.getService(ProjectionSchemaRegistry);
    const resolver = name => {
      return registry.getSchema(name);
    };
    return projectData(schema, data, {...options, resolver});
  }
}