/**
 * Applies database migrations on container start.
 *
 * Databases created before migrations were used (via `prisma db push`) have no
 * `_prisma_migrations` table. Those are brought up to date with a non-destructive
 * `db push` (which refuses to drop data) and then baselined, so every later deploy
 * can use plain `prisma migrate deploy`.
 */
const { execSync } = require('child_process');
const fs = require('fs');
const path = require('path');
const { PrismaClient } = require('@prisma/client');

function run(command) {
  console.log(`[deploy] ${command}`);
  execSync(command, { stdio: 'inherit' });
}

async function main() {
  const prisma = new PrismaClient();
  let hasMigrationsTable;
  let hasTables;
  try {
    const [{ migrations, tables }] = await prisma.$queryRaw`
      SELECT
        to_regclass('public._prisma_migrations') IS NOT NULL AS migrations,
        EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema = 'public') AS tables`;
    hasMigrationsTable = migrations;
    hasTables = tables;
  } finally {
    await prisma.$disconnect();
  }

  if (!hasMigrationsTable && hasTables) {
    console.log('[deploy] Existing database without migration history, baselining');
    run('npx prisma db push --skip-generate');

    const migrationsDir = path.join(__dirname, 'migrations');
    const migrations = fs
      .readdirSync(migrationsDir, { withFileTypes: true })
      .filter((entry) => entry.isDirectory())
      .map((entry) => entry.name)
      .sort();
    for (const name of migrations) {
      run(`npx prisma migrate resolve --applied ${name}`);
    }
  }

  run('npx prisma migrate deploy');
}

main().catch((error) => {
  console.error('[deploy] Migration failed:', error);
  process.exit(1);
});