const API = require('../spec/openapi.json');

const findOperation = (operationId) => {
  const { paths } = API;

  for (let url in paths) {
    const path = paths[url];

    for (let method in path) {
      const operation = path[method];

      if (operation.operationId === operationId) return operation;
    }
  }

  return false;
};

const findSchema = (schemaName) => {
  const { components: { schemas } } = API;

  for (let schemaKey in schemas) {
    if (schemaKey === schemaName) return schemas[schemaKey];
  }

  return false;
};

const getTransformedSchema = (schema) => {
  const transformedSchema = {
    properties: {},
    required: []
  };

  for (let key in schema.properties) {
    const property = schema.properties[key];

    transformedSchema.properties[key] = {
      type: property.type
    };
  }

  for (let key in schema.required) {
    transformedSchema.required.push(schema.required[key]);
  }
  return transformedSchema;
};

/**
 * Parses API specification and tries to find Schema by operationId
 * @param operationId
 * @return {boolean|Object}
 */
const fromRequestBody = (operationId) => {
  const operation = findOperation(operationId);
  if (
    !operation ||
    !operation['requestBody'] ||
    !operation['requestBody']['content'] ||
    !operation['requestBody']['content']['application/json'] ||
    !operation['requestBody']['content']['application/json']['schema'] ||
    !operation['requestBody']['content']['application/json']['schema']['properties']
  ) return false;

  const schema = operation['requestBody']['content']['application/json']['schema'];

  return getTransformedSchema(schema);
};

/**
 * Parses API specification and tries to find Schema by schemaName
 * @param schemaName
 * @return {boolean|Object}
 */
const fromComponentsSchemas = (schemaName) => {
  const schema = findSchema(schemaName);
  if (
    !schema
  ) return false;

  return getTransformedSchema(schema);
};

module.exports = {
  fromRequestBody,
  fromComponentsSchemas
};