<?php

namespace MailPoet\Settings;

use MailPoet\Cron\CronTrigger;
use MailPoet\DI\ContainerWrapper;
use MailPoet\Entities\SettingEntity;
use MailPoet\WP\Functions as WPFunctions;

class SettingsController {

  const DEFAULT_SENDING_METHOD_GROUP = 'website';
  const DEFAULT_SENDING_METHOD = 'PHPMail';
  const DEFAULT_SENDING_FREQUENCY_EMAILS = 25;
  const DEFAULT_SENDING_FREQUENCY_INTERVAL = 5; // in minutes
  const DEFAULT_DEACTIVATE_SUBSCRIBER_AFTER_INACTIVE_DAYS = 180;

  private $loaded = false;

  private $settings = [];

  private $defaults = null;

  /** @var SettingsRepository */
  private $settings_repository;

  function __construct(SettingsRepository $settings_repository) {
    $this->settings_repository = $settings_repository;
  }

  function get($key, $default = null) {
    $this->ensureLoaded();
    $key_parts = explode('.', $key);
    $setting = $this->settings;
    if ($default === null) {
      $default = $this->getDefaultValue($key_parts);
    }
    foreach ($key_parts as $key_part) {
      if (is_array($setting) && array_key_exists($key_part, $setting)) {
        $setting = $setting[$key_part];
      } else {
        return $default;
      }
    }
    if (is_array($setting) && is_array($default)) {
      return array_replace_recursive($default, $setting);
    }
    return $setting;
  }

  function getAllDefaults() {
    if ($this->defaults === null) {
      $this->defaults = [
        'mta_group' => self::DEFAULT_SENDING_METHOD_GROUP,
        'mta' => [
          'method' => self::DEFAULT_SENDING_METHOD,
          'frequency' => [
            'emails' => self::DEFAULT_SENDING_FREQUENCY_EMAILS,
            'interval' => self::DEFAULT_SENDING_FREQUENCY_INTERVAL,
          ],
        ],
        CronTrigger::SETTING_NAME => [
          'method' => CronTrigger::DEFAULT_METHOD,
        ],
        'signup_confirmation' => [
          'enabled' => true,
          'subject' => sprintf(__('Confirm your subscription to %1$s', 'mailpoet'), WPFunctions::get()->getOption('blogname')),
          'body' => WPFunctions::get()->__("Hello,\n\nWelcome to our newsletter!\n\nPlease confirm your subscription to our list by clicking the link below: \n\n[activation_link]I confirm my subscription![/activation_link]\n\nThank you,\n\nThe Team", 'mailpoet'),
        ],
        'tracking' => [
          'enabled' => true,
        ],
        'analytics' => [
          'enabled' => false,
        ],
        'display_nps_poll' => true,
        'deactivate_subscriber_after_inactive_days' => self::DEFAULT_DEACTIVATE_SUBSCRIBER_AFTER_INACTIVE_DAYS,
      ];
    }
    return $this->defaults;
  }

  /**
   * Fetches the value from DB and update in cache
   * This is required for sync settings between parallel processes e.g. cron
   */
  function fetch($key, $default = null) {
    $keys = explode('.', $key);
    $main_key = $keys[0];
    $this->settings[$main_key] = $this->fetchValue($main_key);
    return $this->get($key, $default);
  }

  function getAll() {
    $this->ensureLoaded();
    return array_replace_recursive($this->getAllDefaults(), $this->settings);
  }

  function set($key, $value) {
    $this->ensureLoaded();
    $key_parts = explode('.', $key);
    $main_key = $key_parts[0];
    $last_key = array_pop($key_parts);
    $setting =& $this->settings;
    foreach ($key_parts as $key_part) {
      $setting =& $setting[$key_part];
      if (!is_array($setting)) {
        $setting = [];
      }
    }
    $setting[$last_key] = $value;
    $this->saveValue($main_key, $this->settings[$main_key]);
  }

  function delete($key) {
    $setting = $this->settings_repository->findOneByName($key);
    if ($setting) {
      $this->settings_repository->remove($setting);
      $this->settings_repository->flush();
    }
    unset($this->settings[$key]);
  }

  private function ensureLoaded() {
    if ($this->loaded) {
      return;
    }

    $this->settings = [];
    foreach ($this->settings_repository->findAll() as $setting) {
      $this->settings[$setting->getName()] = $setting->getValue();
    }
    $this->loaded = true;
  }

  private function getDefaultValue($keys) {
    $default = $this->getAllDefaults();
    foreach ($keys as $key) {
      if (array_key_exists($key, $default)) {
        $default = $default[$key];
      } else {
        return null;
      }
    }
    return $default;
  }

  private function fetchValue($key) {
    $setting = $this->settings_repository->findOneByName($key);
    return $setting ? $setting->getValue() : null;
  }

  private function saveValue($key, $value) {
    $setting = $this->settings_repository->findOneByName($key);
    if (!$setting) {
      $setting = new SettingEntity();
      $setting->setName($key);
      $this->settings_repository->persist($setting);
    }
    $setting->setValue($value);
    $this->settings_repository->flush();
  }

  function resetCache() {
    $this->settings = [];
    $this->loaded = false;
  }

  /** @return SettingsController */
  static function getInstance() {
    return ContainerWrapper::getInstance()->get(SettingsController::class);
  }
}