lowdefy/lowdefy

/*
  Copyright 2020-2024 Lowdefy, Inc

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/

import { type } from '@lowdefy/helpers';

const runInstance = ({ location, meta, methodName, operator, params, instanceType }) => {
  if (!meta[methodName]) {
    throw new Error(
      `Operator Error: ${operator}.${methodName} is not supported, use one of the following: ${Object.keys(
        meta
      ).join(', ')}.
      Received: {"${operator}.${methodName}":${JSON.stringify(params)}} at ${location}.`
    );
  }
  // validate params type
  if (meta[methodName].validTypes && !meta[methodName].validTypes.includes(type.typeOf(params))) {
    throw new Error(
      `Operator Error: ${operator}.${methodName} accepts one of the following types: ${meta[
        methodName
      ].validTypes.join(', ')}.
      Received: {"${operator}.${methodName}":${JSON.stringify(params)}} at ${location}.`
    );
  }

  let instance;
  let args = [];
  if (meta[methodName].singleArg || meta[methodName].property) {
    instance = params;
  } else {
    if (type.isArray(params)) {
      // Instance must be zero in list args.
      instance = params[0];
      args = params.slice(1);
    }
    // Instance must be listed first in named args.
    if (type.isObject(params)) {
      instance = params[meta[methodName].namedArgs[0]];
      args.push(...meta[methodName].namedArgs.slice(1).map((key) => params[key]));
      if (
        !type.isNone(meta[methodName].spreadArgs) &&
        !type.isArray(params[meta[methodName].spreadArgs])
      ) {
        throw new Error(
          `Operator Error: ${operator}.${methodName} takes an array as input argument for ${
            meta[methodName].spreadArgs
          }.
          Received: {"${operator}.${methodName}":${JSON.stringify(params)}} at ${location}.`
        );
      }
      args.push(...(params[meta[methodName].spreadArgs] || []));
    }
  }

  if (type.isFunction(meta[methodName].prep)) {
    [instance, ...args] = meta[methodName].prep([instance, ...args]);
  }

  if (type.typeOf(instance) !== instanceType) {
    throw new Error(`Operator Error: ${operator}.${methodName} must be evaluated on an ${instanceType} instance. For named args provide an ${instanceType} instance to the "on" property, for listed args provide and ${instanceType} instance as the first element in the operator argument array.
    Received: {"${operator}.${methodName}":${JSON.stringify(params)}} at ${location}.`);
  }
  // Error for invalid method key.
  if (type.isNone(instance[methodName])) {
    throw new Error(
      `Operator Error: ${operator} must be evaluated using one of the following: ${Object.keys(
        meta
      ).join(', ')}.
      Received: {"${operator}.${methodName}":${JSON.stringify(params)}} at ${location}.`
    );
  }
  // for property
  if (meta[methodName].property) {
    return instance[methodName];
  }
  try {
    const result = instance[methodName](...args);
    if (meta[methodName].returnInstance) {
      return instance;
    }
    return result;
  } catch (e) {
    throw new Error(
      `Operator Error: ${operator}.${methodName} - ${
        e.message
      } Received: {"${operator}.${methodName}":${JSON.stringify(params)}} at ${location}.`
    );
  }
};

export default runInstance;