/**
 * @author Martin Karkowski
 * @email m.karkowski@zema.de
 * @create date 2020-11-06 08:53:55
 * @modify date 2020-11-06 08:53:56
 * @desc [description]
 */

import { IJsonSchema } from "../types/IJSONSchema";
import { flattenObject, rgetattr, rsetattr, SPLITCHAR } from "./objectMethods";

/**
 * Function to Flatten a JSON-Schema.
 * @param schema 
 */
export function flattenSchema(schema: IJsonSchema) {

  let counter = 10000;
  let flattenSchema = flattenObject(schema);

  const getRefKeys = (flattenSchema: Map<string, any>) => {
    const relevantKeys: Array<{ schemaPath: string, searchPath: string }> = []

    for (const [key, value] of flattenSchema) {
      if (key.endsWith('$ref')) {
        relevantKeys.push({
          schemaPath: key,
          searchPath: value.replace('#/', '').replace('/', SPLITCHAR)
        })
      }
    }
    return relevantKeys;
  }

  let refs = getRefKeys(flattenSchema);
  while (refs.length > 0) {

    counter--;

    if (counter === 0) {
      throw Error('Max amount of Recursions performed')
    }

    for (const ref of refs) {
      const subSchema = rgetattr(schema, ref.searchPath, null, '.');
      rsetattr(schema, ref.schemaPath.replace('.$ref', ''), subSchema)
    }

    flattenSchema = flattenObject(schema);
    refs = getRefKeys(flattenSchema);
  }

  return schema as IJsonSchema;
}

/**
* Function to get a Schemas Definition
* @param schema the JSON-Schema
* @param reference the path of the relevant definition.
*/
export function schemaGetDefinition(schema: IJsonSchema, reference: string) {
  return rgetattr(schema, reference.replace('#/', ''), null, '/');
}