import * as path from 'path';
import * as dotenv from 'dotenv';
import * as fs from 'fs';
import { exec } from 'child_process';
import { buildAndValidateDatabaseConfig } from './database-config-utils';

function createDatabaseFromFile(envPath: string): void {
  const result = dotenv.config({ path: envPath });

  if (result.error) {
    throw result.error;
  }

  createDatabase();
}

function createDatabase(): void {
  const { value: envVars, error } = buildAndValidateDatabaseConfig();

  if (error) {
    throw new Error(`Config validation error: ${error.message}`);
  }

  const connectivityCheck = exec('command -v createdb');

  connectivityCheck.on('exit', function (signal) {
    if (signal === 1) {
      console.error('Unable to connect to database');
      process.exit(1);
    }
  });

  const createdb =
    `PGPASSWORD=${envVars.PG_PASS} createdb ` +
    `-h ${envVars.PG_HOST} ` +
    `-p ${envVars.PG_PORT} ` +
    `-U ${envVars.PG_USER} ` +
    process.env.PG_DB;

  exec(createdb, (err, _stdout, _stderr) => {
    if (!err) {
      console.log(`Created database ${envVars.PG_DB}`);
      return;
    }

    const errorMessage = `database "${envVars.PG_DB}" already exists`;

    if (err.message.includes(errorMessage)) {
      console.log(`Using database: ${envVars.PG_DB}`);
    } else {
      console.error(err);
      process.exit(1);
    }
  });
}

const nodeEnvPath = path.resolve(process.cwd(), process.env.NODE_ENV === 'test' ? '../.env.test' : '../.env');

const fallbackPath = path.resolve(process.cwd(), '../.env');

if (fs.existsSync(nodeEnvPath)) {
  createDatabaseFromFile(nodeEnvPath);
} else if (fs.existsSync(fallbackPath)) {
  createDatabaseFromFile(fallbackPath);
} else {
  console.log('Picking up config from the environment');

  createDatabase();
}