import Ajv from 'ajv';
import addFormats from 'ajv-formats';
import schema from '@openstapps/core/schema.json' assert {type: 'json'};

/**
 * StAppsCore validator
 * @typedef {import('ajv').AnySchema} AnySchema
 * @typedef {import('@openstapps/core/schema.json').SchemaMap} SchemaMap
 */
export class Validator {
  /**
   * @private
   * @readonly
   * @type {Ajv.default}
   */
  ajv;

  get errors() {
    return this.ajv.errors;
  }

  /**
   * @param additionalSchemas {AnySchema[]}
   */
  constructor(additionalSchemas = []) {
    this.ajv = new Ajv.default({
      schemas: [schema, ...additionalSchemas],
      verbose: true,
      keywords: ['elasticsearch'],
      allowUnionTypes: true,
    });
    addFormats.default(this.ajv, {
      formats: ['date-time', 'time', 'uuid', 'duration'],
      mode: 'fast',
    });
  }

  /**
   * Add additional schemas to the validator
   * @param schema {AnySchema[]}
   */
  addSchema(...schema) {
    this.ajv.addSchema(schema);
  }

  /**
   * Validates anything against a given schema name or infers schema name from object
   * @template {SchemaMap[keyof SchemaMap]} T
   *
   * @param instance {unknown} Instance to validate
   * @param schema {import('./types.js').NameOf<T>} Name of schema to validate instance against or the schema itself
   * @returns {instance is T}
   *
   */ /**
   * @param instance {unknown}
   * @param schema {Ajv.Schema | string}
   * @returns {boolean}
   */
  validate(instance, schema) {
    return this.ajv.validate(typeof schema === 'string' ? `#/definitions/${schema}` : schema, instance);
  }
}