/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

/* eslint-disable strict */

const nodePath = require('path');

// Variables will be replaced before the code is loaded

// path to actual action sources
const path = "$$sourcePath$$";
// main function
const mainFn = "$$main$$";
// name of module file (for helpful errors)
const sourceFile = "$$sourceFile$$";

function clearEntireRequireCache() {
    Object.keys(require.cache).forEach(function(key) {
        delete require.cache[key];
    });
}

let firstRun = true;

// eslint-disable-next-line no-unused-vars
function main(args) { // lgtm [js/unused-local-variable]
    process.chdir(nodePath.dirname(path));

    if (firstRun) {
        const start = Date.now();
        console.log(`[wskdebug] loading action sources from ${sourceFile}`);
        // validation with better error messages
        try {
            require(path);
        } catch (e) {
            throw `Cannot load module '${sourceFile}': ${e}`;
        }

        if (typeof require(path)[mainFn] !== "function") {
            throw `'${mainFn}' is not a function in '${sourceFile}'. Specify the right function in wskdebug using --main.`;
        }
        firstRun = false;
        console.log(`[wskdebug] loaded in ${Date.now() - start} ms.`);
    }

    // force reload of entire mounted action on every invocation
    clearEntireRequireCache();

    // require and invoke main function
    return require(path)[mainFn](args);
}