#!/usr/bin/env node

/**
 * Module dependencies.
 */

const program = require('commander');
const util = require('./util');
const inquirer = require('inquirer');
const mongoose = require('../services/mongoose');
const MigrationService = require('../services/migration');

// Register shutdown hooks.
util.onshutdown([
  () => mongoose.disconnect()
]);

async function createMigration(name) {
  try {

    // Create the migration.
    await MigrationService.create(name);

    util.shutdown();
  } catch (e) {
    console.error(e);
    util.shutdown(1);
  }
}

async function runMigrations() {

  try {

    let {backedUp} = await inquirer.prompt([
      {
        type: 'confirm',
        name: 'backedUp',
        message: 'Did you perform a database backup',
        default: false
      }
    ]);

    if (!backedUp) {
      throw new Error('Please backup your databases prior to migrations occuring');
    }

    // Get the migrations to run.
    let migrations = await MigrationService.listPending();

    console.log('Now going to run the following migrations:\n');

    for (let {filename} of migrations) {
      console.log(`\tmigrations/${filename}`);
    }

    let {confirm} = await inquirer.prompt([
      {
        type: 'confirm',
        name: 'confirm',
        message: 'Proceed with migrations',
        default: false
      }
    ]);

    if (confirm) {

      // Run the migrations.
      await MigrationService.run(migrations);
    } else {
      console.warn('Skipping migrations');
    }

    util.shutdown();
  } catch (e) {
    console.error(e);
    util.shutdown(1);
  }
}

//==============================================================================
// Setting up the program command line arguments.
//==============================================================================

program
  .command('create <name>')
  .description('creates a new migration')
  .action(createMigration);

program
  .command('run')
  .description('runs all pending migrations')
  .action(runMigrations);

program.parse(process.argv);

// If there is no command listed, output help.
if (process.argv.length <= 2) {
  program.outputHelp();
  util.shutdown();
}