'use strict';

const { getSetting, setSetting } = require('../db/database');

const SYNC_DAYS_DEFAULT = 90;

function encryptionKeyReady() {
  const key = process.env.TOKEN_ENCRYPTION_KEY || '';
  return Buffer.from(key, 'utf8').length >= 32;
}

function getBankSyncConfig() {
  const dbValue  = getSetting('bank_sync_enabled');
  const envValue = process.env.BANK_SYNC_ENABLED;

  let enabled;
  if (dbValue !== null && dbValue !== undefined && dbValue !== '') {
    enabled = dbValue === 'true';
  } else if (envValue !== undefined && envValue !== '') {
    enabled = envValue === 'true';
  } else {
    enabled = false;
  }

  const syncDaysDb  = parseInt(getSetting('simplefin_sync_days') || '', 10);
  const syncDaysEnv = parseInt(process.env.SIMPLEFIN_SYNC_DAYS || '', 10);
  const syncDays    = Number.isFinite(syncDaysDb) && syncDaysDb > 0
    ? syncDaysDb
    : Number.isFinite(syncDaysEnv) && syncDaysEnv > 0
    ? syncDaysEnv
    : SYNC_DAYS_DEFAULT;

  return {
    enabled,
    encryption_key_set: encryptionKeyReady(),
    sync_days: syncDays,
  };
}

function setBankSyncEnabled(enabled) {
  if (enabled && !encryptionKeyReady()) {
    const err = new Error('TOKEN_ENCRYPTION_KEY must be set (32+ chars) before enabling bank sync');
    err.status = 400;
    throw err;
  }
  setSetting('bank_sync_enabled', enabled ? 'true' : 'false');
  return getBankSyncConfig();
}

module.exports = { getBankSyncConfig, setBankSyncEnabled };