#!/usr/bin/env node

import process from "process";
import { ArgumentParser } from "argparse";
import { safeLoad } from "js-yaml";

import { Linter } from "../lib/linter";
import { readFile } from "../lib/utils";
import { terminalOutput } from "../lib/output/terminal";

import pkginfo from "../package.json";

async function main() {
  const parser = new ArgumentParser({
    version: pkginfo.version,
    description: pkginfo.description,
    addHelp: true
  });
  parser.addArgument("config", {
    help: "The configuration file to use"
  });

  const args = parser.parseArgs();

  const str = await readFile(args.config);
  const config = safeLoad(str);
  config.appId = loadFromEnv(config.appId);
  config.secret = loadFromEnv(config.secret);
  config.tenant = loadFromEnv(config.tenant);

  const problems = await new Linter(config).run();
  terminalOutput(problems);
}

function loadFromEnv(arg: any): string {
  if (typeof arg === "string") {
    return arg;
  } else {
    if (arg && arg.env && typeof arg.env === "string") {
      const val = process.env[arg.env];
      if (!val || typeof val !== "string" || val.length === 0) {
        throw new Error(`Environment variable empty: ${arg.env}`);
      }
      return val;
    }
    throw new Error("Invalid configuration object!");
  }
}

main().catch(err => {
  process.exitCode = 1;
  console.error(err);
});