import fs from 'fs';
import { RJSFSchema, StrictRJSFSchema } from '@rjsf/utils';

import { CustomValidatorOptionsType } from './types';
import { compileSchemaValidatorsCode } from './compileSchemaValidatorsCode';

export { compileSchemaValidatorsCode };

/** The function used to compile a schema into an output file in the form that allows it to be used as a precompiled
 * validator. The main reasons for using a precompiled validator is reducing code size, improving validation speed and,
 * most importantly, avoiding dynamic code compilation when prohibited by a browser's Content Security Policy. For more
 * information about AJV code compilation see: https://ajv.js.org/standalone.html
 *
 * @param schema - The schema to be compiled into a set of precompiled validators functions
 * @param output - The name of the file into which the precompiled validator functions will be generated
 * @param [options={}] - The set of `CustomValidatorOptionsType` information used to alter the AJV validator used for
 *        compiling the schema. They are the same options that are passed to the `customizeValidator()` function in
 *        order to modify the behavior of the regular AJV-based validator.
 */
export default function compileSchemaValidators<S extends StrictRJSFSchema = RJSFSchema>(
  schema: S,
  output: string,
  options: CustomValidatorOptionsType = {}
) {
  console.log('parsing the schema');

  const moduleCode = compileSchemaValidatorsCode(schema, options);
  console.log(`writing ${output}`);
  fs.writeFileSync(output, moduleCode);
}