const { NodeVM } = require('vm2');
const path = require('path');
const http = require('http');
const https = require('https');
const stream = require('stream');
const util = require('util');
const zlib = require('zlib');
const url = require('url');
const punycode = require('punycode');
const fs = require('fs');
const { get } = require('lodash');
const Bru = require('../bru');
const BrunoRequest = require('../bruno-request');
const BrunoResponse = require('../bruno-response');
const { cleanJson } = require('../utils');

// Inbuilt Library Support
const ajv = require('ajv');
const atob = require('atob');
const btoa = require('btoa');
const lodash = require('lodash');
const moment = require('moment');
const uuid = require('uuid');
const nanoid = require('nanoid');
const axios = require('axios');
const fetch = require('node-fetch');
const chai = require('chai');
const CryptoJS = require('crypto-js');

class ScriptRuntime {
  constructor() {}

  // This approach is getting out of hand
  // Need to refactor this to use a single arg (object) instead of 7
  async runRequestScript(
    script,
    request,
    envVariables,
    collectionVariables,
    collectionPath,
    onConsoleLog,
    processEnvVars,
    scriptingConfig
  ) {
    const bru = new Bru(envVariables, collectionVariables, processEnvVars, collectionPath);
    const req = new BrunoRequest(request);
    const allowScriptFilesystemAccess = get(scriptingConfig, 'filesystemAccess.allow', false);
    const moduleWhitelist = get(scriptingConfig, 'moduleWhitelist', []);
    const additionalContextRoots = get(scriptingConfig, 'additionalContextRoots', []);
    const additionalContextRootsAbsolute = lodash
      .chain(additionalContextRoots)
      .map((acr) => (acr.startsWith('/') ? acr : path.join(collectionPath, acr)))
      .value();

    const whitelistedModules = {};

    for (let module of moduleWhitelist) {
      try {
        whitelistedModules[module] = require(module);
      } catch (e) {
        // Ignore
        console.warn(e);
      }
    }

    const context = {
      bru,
      req
    };

    if (onConsoleLog && typeof onConsoleLog === 'function') {
      const customLogger = (type) => {
        return (...args) => {
          onConsoleLog(type, cleanJson(args));
        };
      };
      context.console = {
        log: customLogger('log'),
        debug: customLogger('debug'),
        info: customLogger('info'),
        warn: customLogger('warn'),
        error: customLogger('error')
      };
    }

    const vm = new NodeVM({
      sandbox: context,
      require: {
        context: 'sandbox',
        external: true,
        root: [collectionPath, ...additionalContextRootsAbsolute],
        mock: {
          // node libs
          path,
          stream,
          util,
          url,
          http,
          https,
          punycode,
          zlib,
          // 3rd party libs
          ajv,
          atob,
          btoa,
          lodash,
          moment,
          uuid,
          nanoid,
          axios,
          chai,
          'node-fetch': fetch,
          'crypto-js': CryptoJS,
          ...whitelistedModules,
          fs: allowScriptFilesystemAccess ? fs : undefined
        }
      }
    });
    const asyncVM = vm.run(`module.exports = async () => { ${script} }`, path.join(collectionPath, 'vm.js'));
    await asyncVM();
    return {
      request,
      envVariables: cleanJson(envVariables),
      collectionVariables: cleanJson(collectionVariables)
    };
  }

  async runResponseScript(
    script,
    request,
    response,
    envVariables,
    collectionVariables,
    collectionPath,
    onConsoleLog,
    processEnvVars,
    scriptingConfig
  ) {
    const bru = new Bru(envVariables, collectionVariables, processEnvVars, collectionPath);
    const req = new BrunoRequest(request);
    const res = new BrunoResponse(response);
    const allowScriptFilesystemAccess = get(scriptingConfig, 'filesystemAccess.allow', false);
    const moduleWhitelist = get(scriptingConfig, 'moduleWhitelist', []);

    const whitelistedModules = {};

    for (let module of moduleWhitelist) {
      try {
        whitelistedModules[module] = require(module);
      } catch (e) {
        // Ignore
        console.warn(e);
      }
    }

    const context = {
      bru,
      req,
      res
    };

    if (onConsoleLog && typeof onConsoleLog === 'function') {
      const customLogger = (type) => {
        return (...args) => {
          onConsoleLog(type, cleanJson(args));
        };
      };
      context.console = {
        log: customLogger('log'),
        info: customLogger('info'),
        warn: customLogger('warn'),
        error: customLogger('error')
      };
    }

    const vm = new NodeVM({
      sandbox: context,
      require: {
        context: 'sandbox',
        external: true,
        root: [collectionPath],
        mock: {
          // node libs
          path,
          stream,
          util,
          url,
          http,
          https,
          punycode,
          zlib,
          // 3rd party libs
          ajv,
          atob,
          btoa,
          lodash,
          moment,
          uuid,
          nanoid,
          axios,
          'node-fetch': fetch,
          'crypto-js': CryptoJS,
          ...whitelistedModules,
          fs: allowScriptFilesystemAccess ? fs : undefined
        }
      }
    });

    const asyncVM = vm.run(`module.exports = async () => { ${script} }`, path.join(collectionPath, 'vm.js'));
    await asyncVM();

    return {
      response,
      envVariables: cleanJson(envVariables),
      collectionVariables: cleanJson(collectionVariables)
    };
  }
}

module.exports = ScriptRuntime;