import fs from 'fs'
import path from 'path'
import { db } from './db'

export async function runMigrations() {
  const migrationsDir = path.join(process.cwd(), 'migrations')

  // Create migrations tracking table
  await db.query(`
    CREATE TABLE IF NOT EXISTS _migrations (
      id         SERIAL PRIMARY KEY,
      name       VARCHAR(255) NOT NULL UNIQUE,
      applied_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
    )
  `)

  const files = fs.readdirSync(migrationsDir)
    .filter(f => f.endsWith('.sql') && !f.startsWith('._'))
    .sort()

  for (const file of files) {
    const { rows } = await db.query(
      'SELECT id FROM _migrations WHERE name = $1',
      [file],
    )
    if (rows.length > 0) continue // already applied

    const sql = fs.readFileSync(path.join(migrationsDir, file), 'utf8')
    console.log(`[migrate] Applying ${file}...`)

    const client = await db.connect()
    try {
      await client.query('BEGIN')
      await client.query(sql)
      await client.query('INSERT INTO _migrations (name) VALUES ($1)', [file])
      await client.query('COMMIT')
      console.log(`[migrate] ✅ ${file} applied`)
    } catch (err) {
      await client.query('ROLLBACK')
      console.error(`[migrate] ❌ ${file} failed:`, err)
      throw err
    } finally {
      client.release()
    }
  }

  console.log('[migrate] All migrations up to date')
}