const fs = require("fs");
const path = require("path");

if (global.__base == undefined)
  global.__base = path.join(__dirname, "../..");

const db = require("../index.js");

const allTableNames = () => {
  const sql = `
    SELECT tablename
    FROM pg_catalog.pg_tables
    WHERE schemaname != 'pg_catalog' AND
    schemaname != 'information_schema'
  `;

  return db.all(sql)
    .then(rows => rows.map(row => row.tablename).reverse())
}

const teardown = (tableNames) => {
  if (tableNames.length) {
    console.log(`Tearing down tables:`)
    console.log(` - ${tableNames.join("\n - ")}`)

    const sql = `DROP TABLE IF EXISTS ${tableNames.join(",")}`;
    return db.query(sql);
  } else {
    console.log("No tables left to drop.");
    return Promise.resolve();
  }
}

const handleExit = (error=undefined) => {
  if (error != undefined) {
    console.log(`🚫 Exited with error: ${error}`);
    process.exit(1);
  }

  console.log("✅ Exited teardown successfully!");
  process.exit(0);
};

db.connect()
  .then(() => allTableNames())
  .then(tableNames => teardown(tableNames))
  .catch(console.log)
  .finally(handleExit)

module.exports = db;