import * as mysql from 'mysql';
import { Product } from 'ssn';
import createStatement from './database/createStatement';
import * as database from './database/database';
import products from './exports/productList';
import IDatabaseRow from './interfaces/IDatabaseRow';
import IDatabaseSettings from './interfaces/IDatabaseSettings';
import IProductData from './interfaces/IProductData';
import writeLog from './logger/writeLog';

export default async function init(dbSettings: IDatabaseSettings): Promise<{ [key in Product]?: IProductData }> {
  const output: { [key in Product]?: IProductData } = {};

  await database.init(dbSettings);

  //Only create table if it does not exist yet
  const createIfNotExists = createStatement.replace(/^CREATE TABLE/, 'CREATE TABLE IF NOT EXISTS');
  await database.query(createIfNotExists);

  const { results: existingRows }: { results: IDatabaseRow[]} = await database.query('SELECT * FROM ssn_versions');

  existingRows.forEach(function(row: IDatabaseRow) {
    if (!products.includes(row.product)) {
      writeLog(`Product ${row.product} in database table is invalid.`);
      return;
    }

    output[row.product] = { http: row.http, manifest: row.manifest };
  });

  //If row does not exist, INSERT into table
  const missingProducts = products.filter((product) => output[product] === undefined);
  await Promise.all(missingProducts.map(function(product) {
    output[product] = { http: -1, manifest: -1 };
    const queryTemplate = `INSERT INTO \`ssn_versions\` (\`product\`, \`manifest\`, \`http\`) VALUES (?, '-1', '-1');`;
    const query = mysql.format(queryTemplate, [String(product)]);
    return database.query(query);
  }));

  return output;
}