require('dotenv').config();
const { PrismaClient } = require('@prisma/client');
const chalk = require('chalk');
const spawn = require('cross-spawn');
const { execSync } = require('child_process');

if (process.env.SKIP_DB_CHECK) {
  console.log('Skipping database check.');
  process.exit(0);
}

const prisma = new PrismaClient();

function success(msg) {
  console.log(chalk.greenBright(`✓ ${msg}`));
}

function error(msg) {
  console.log(chalk.redBright(`✗ ${msg}`));
}

async function checkEnv() {
  if (!process.env.DATABASE_URL) {
    throw new Error('DATABASE_URL is not defined.');
  } else {
    success('DATABASE_URL is defined.');
  }
}

async function checkConnection() {
  try {
    await prisma.$connect();

    success('Database connection successful.');
  } catch (e) {
    throw new Error('Unable to connect to the database.');
  }
}

async function checkTables() {
  try {
    await prisma.account.findFirst();

    success('Database tables found.');
  } catch (e) {
    error('Database tables not found.');
    console.log('Adding tables...');

    console.log(execSync('prisma migrate deploy').toString());
  }
}

async function run(cmd, args) {
  const buffer = [];
  const proc = spawn(cmd, args);

  return new Promise((resolve, reject) => {
    proc.stdout.on('data', data => buffer.push(data));

    proc.on('error', () => {
      reject(new Error('Failed to run Prisma.'));
    });

    proc.on('exit', () => resolve(buffer.join('')));
  });
}

async function checkMigrations() {
  const output = await run('prisma', ['migrate', 'status']);

  console.log(output);

  const missingMigrations = output.includes('have not yet been applied');
  const missingInitialMigration =
    output.includes('01_init') && !output.includes('The last common migration is: 01_init');
  const notManaged = output.includes('The current database is not managed');

  if (notManaged || missingMigrations) {
    console.log('Running update...');

    if (missingInitialMigration) {
      console.log(execSync('prisma migrate resolve --applied "01_init"').toString());
    }

    console.log(execSync('prisma migrate deploy').toString());
  }

  success('Database is up to date.');
}

(async () => {
  let err = false;
  for (let fn of [checkEnv, checkConnection, checkTables, checkMigrations]) {
    try {
      await fn();
    } catch (e) {
      console.log(chalk.red(`✗ ${e.message}`));
      err = true;
    } finally {
      await prisma.$disconnect();
      if (err) {
        process.exit(1);
      }
    }
  }
})();