import mysql from 'mysql2/promise';
import { readFileSync, readdirSync } from 'node:fs';
import { join } from 'node:path';
import '../src/core/config.js';

/** Legt eine frische Testdatenbank an (niemals die produktive) und wendet alle Migrationen an. */
export default async function setup() {
  const base = { host: process.env.DB_HOST ?? '127.0.0.1', user: process.env.DB_USER!, password: process.env.DB_PASSWORD! };
  const admin = await mysql.createConnection(base);
  await admin.query('DROP DATABASE IF EXISTS kundencenter_test');
  await admin.query('CREATE DATABASE kundencenter_test CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci');
  await admin.end();
  const c = await mysql.createConnection({ ...base, database: 'kundencenter_test' });
  await c.query('CREATE TABLE IF NOT EXISTS schema_migrations (name VARCHAR(200) PRIMARY KEY, applied_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3))');
  const dir = join(process.cwd(), '../../migrations');
  for (const f of readdirSync(dir).filter((n) => n.endsWith('.sql')).sort()) {
    await c.query('INSERT INTO schema_migrations (name) VALUES (?)', [f]);
    for (const st of readFileSync(join(dir, f), 'utf8').replace(/^\s*--.*$/gm, '').split(/;\s*\n/).map((s) => s.trim()).filter(Boolean)) await c.query(st);
  }
  await c.end();
}