<?php

/**
 * Form builder for settings form.
 */
function spambot_settings_form() {
  $numbers = array(
    1 => 1,
    2 => 2,
    3 => 3,
    4 => 4,
    5 => 5,
    6 => 6,
    7 => 7,
    8 => 8,
    9 => 9,
    10 => 10,
    15 => 15,
    20 => 20,
    30 => 30,
    40 => 40,
    50 => 50,
    60 => 60,
    70 => 70,
    80 => 80,
    90 => 90,
    100 => 100,
    150 => 150,
    200 => 200,
  );

  // Fieldset for set up spam criteria.
  $form['criteria'] = array(
    '#type' => 'fieldset',
    '#title' => t('Spammer criteria'),
    '#description' => t('A user account or an attempted user registration will be deemed a spammer if the email, username, or IP address has been reported to www.stopforumspam.com more times than the following thresholds.'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['criteria']['spambot_criteria_email'] = array(
    '#type' => 'select',
    '#title' => t('Number of times the email has been reported is equal to or more than'),
    '#description' => t('If the email address for a user or user registration has been reported to www.stopforumspam.com this many times, then it is deemed as a spammer.'),
    '#options' => array(0 => t('Don\'t use email as a criteria')) + $numbers,
    '#default_value' => variable_get('spambot_criteria_email', SPAMBOT_DEFAULT_CRITERIA_EMAIL),
  );
  $form['criteria']['spambot_criteria_username'] = array(
    '#type' => 'select',
    '#title' => t('Number of times the username has been reported is equal to or more than'),
    '#description' => t('If the username for a user or user registration has been reported to www.stopforumspam.com this many times, then it is deemed as a spammer. Be careful about using this option as you may accidentally block genuine users who happen to choose the same username as a known spammer.'),
    '#options' => array(0 => t('Don\'t use username as a criteria')) + $numbers,
    '#default_value' => variable_get('spambot_criteria_username', SPAMBOT_DEFAULT_CRITERIA_USERNAME),
  );
  $form['criteria']['spambot_criteria_ip'] = array(
    '#type' => 'select',
    '#title' => t('Number of times the IP address has been reported is equal to or more than'),
    '#description' => t('If the IP address for a user or user registration has been reported to www.stopforumspam.com this many times, then it is deemed as a spammer. Be careful about setting this threshold too low as IP addresses can change.'),
    '#options' => array(0 => t('Don\'t use IP address as a criteria')) + $numbers,
    '#default_value' => variable_get('spambot_criteria_ip', SPAMBOT_DEFAULT_CRITERIA_IP),
  );

  // Whitelists.
  $form['spambot_whitelist'] = array(
    '#type' => 'fieldset',
    '#title' => t('Whitelists'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['spambot_whitelist']['spambot_whitelist_email'] = array(
    '#type' => 'textarea',
    '#title' => t('Allowed email addresses'),
    '#description' => t('Enter email addresses, one per line.'),
    '#default_value' => variable_get('spambot_whitelist_email', ''),
  );
  $form['spambot_whitelist']['spambot_whitelist_username'] = array(
    '#type' => 'textarea',
    '#title' => t('Allowed usernames'),
    '#description' => t('Enter usernames, one per line.'),
    '#default_value' => variable_get('spambot_whitelist_username', ''),
  );
  $form['spambot_whitelist']['spambot_whitelist_ip'] = array(
    '#type' => 'textarea',
    '#title' => t('Allowed IP addresses'),
    '#description' => t('Enter IP addresses, one per line.'),
    '#default_value' => variable_get('spambot_whitelist_ip', ''),
  );

  // Fieldset for configure protecting at user register form.
  $form['register'] = array(
    '#type' => 'fieldset',
    '#title' => t('User registration'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['register']['spambot_user_register_protect'] = array(
    '#type' => 'checkbox',
    '#title' => t('Protect the user registration form'),
    '#description' => t('If ticked, new user registrations will be tested if they match any known spammers and blacklisted.'),
    '#default_value' => variable_get('spambot_user_register_protect', TRUE),
  ); 

  $sleep_options = array(t('Don\'t delay'), t('1 second'));
  foreach (array(2, 3, 4, 5, 10, 20, 30) as $num) {
    $sleep_options[$num] = t('@num seconds', array('@num' => $num));
  }
  $form['register']['spambot_blacklisted_delay'] = array(
    '#type' => 'select',
    '#title' => t('If blacklisted, delay for'),
    '#description' => t('If an attempted user registration is blacklisted, you can choose to deliberately delay the request. This can be useful for slowing them down if they continually try to register.<br />Be careful about choosing too large a value for this as it may exceed your PHP max_execution_time.'),
    '#options' => $sleep_options,
    '#default_value' => variable_get('spambot_blacklisted_delay', SPAMBOT_DEFAULT_DELAY),
  );

  // Fieldset for set up scanning of existing accounts.
  $form['existing'] = array(
    '#type' => 'fieldset',
    '#title' => t('Scan existing accounts'),
    '#description' => t('This module can also scan existing user accounts to see if they are known spammers. It works by checking user accounts with increasing uid\'s ie. user id 2, 3, 4 etc during cron.'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['existing']['spambot_cron_user_limit'] = array(
    '#type' => 'textfield',
    '#title' => t('Maximum number of user accounts to scan per cron'),
    '#description' => t('Enter the number of user accounts to scan for each cron. If you do not want to scan existing user accounts, leave this as 0.<br />Be careful not to make this value too large, as it will slow your cron execution down and may cause your site to query www.stopforumspam.com more times than allowed each day.'),
    '#size' => 10,
    '#default_value' => variable_get('spambot_cron_user_limit', SPAMBOT_DEFAULT_CRON_USER_LIMIT),
  );
  $form['existing']['spambot_check_blocked_accounts'] = array(
    '#type' => 'checkbox',
    '#title' => t('Scan blocked accounts'),
    '#description' => t('Tick this to scan blocked accounts. Otherwise blocked accounts are not scanned.'),
    '#default_value' => variable_get('spambot_check_blocked_accounts', FALSE),
  );
  $form['existing']['spambot_spam_account_action'] = array(
    '#type' => 'select',
    '#title' => t('Action to take'),
    '#description' => t('Please select what action to take for user accounts which are found to be spammers.<br />No action will be taken against accounts with the permission <em>protected from spambot scans</em> but they will be logged.'),
    '#options' => array(
      SPAMBOT_ACTION_NONE => t('None, just log it.'),
      SPAMBOT_ACTION_BLOCK => t('Block user account'),
      SPAMBOT_ACTION_DELETE => t('Delete user account'),
    ),
    '#default_value' => variable_get('spambot_spam_account_action', SPAMBOT_ACTION_NONE),
  );

  // Get scan status.
  $suffix = '';
  if ($last_uid = variable_get('spambot_last_checked_uid', 0)) {
    $num_checked = db_select('users', 'u')
      ->fields('u', array('uid'))
      ->condition('u.uid', 1, '>')
      ->condition('u.uid', $last_uid, '<=')
      ->execute()
      ->rowCount();

    $num_left = db_select('users', 'u')
      ->fields('u', array('uid'))
      ->condition('u.uid', 1, '>')
      ->condition('u.uid', $last_uid, '>')
      ->execute()
      ->rowCount();

    $last_uid = db_select('users', 'u')
      ->fields('u', array('uid'))
      ->condition('u.uid', 1, '>')
      ->condition('u.uid', $last_uid, '<=')
      ->orderBy('u.uid', 'DESC')
      ->range(0, 1)
      ->execute()
      ->fetchField();
    
    $account = user_load($last_uid);
    $suffix = '<br />' . t('The last checked user account is: !account (uid @uid)', array('!account' => l(check_plain($account->name), 'user/' . $account->uid), '@uid' => $account->uid));
  }
  else {
    $num_checked = 0;
    $num_left = db_select('users')
      ->fields('users')
      ->condition('uid', 1, '>')
      ->execute()
      ->rowCount();
  }

  $text = t('Accounts checked: @checked, Accounts remaining: @remaining', array('@checked' => $num_checked, '@remaining' => $num_left));
  $form['existing']['message'] = array(
    '#type' => 'fieldset',
    '#title' => t('Scan status'),
    '#description' => $text . $suffix,
  );
  $form['existing']['spambot_last_checked_uid'] = array(
    '#type' => 'textfield',
    '#title' => t('Continue scanning after this user id'),
    '#size' => 10,
    '#description' => t('Scanning of existing user accounts has progressed to, and including, user id @uid and will continue by scanning accounts after user id @uid. If you wish to change where the scan continues scanning from, enter a different user id here. If you wish to scan all users again, enter a value of 0.', array('@uid' => $last_uid)),
    '#default_value' => $last_uid,
  );

  // Fieldset for set up messages which will be displayed for blocked users.
  $form['messages'] = array(
    '#type' => 'fieldset',
    '#title' => t('Blocked messages'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['messages']['spambot_blocked_message_email'] = array(
    '#type' => 'textarea',
    '#title' => t('User registration blocked message (blocked email address)'),
    '#rows' => 1,
    '#default_value' => t(variable_get('spambot_blocked_message_email', SPAMBOT_DEFAULT_BLOCKED_MESSAGE)),
    '#description' => t('Message to display when user action is blocked due to email address. <br />Showing a specific reason why registration was blocked may make spambot easier to circumvent.<br />The following tokens are available: <em>@email %email @username %username @ip %ip</em>'),
  );
  $form['messages']['spambot_blocked_message_username'] = array(
    '#type' => 'textarea',
    '#title' => t('User registration blocked message (blocked username)'),
    '#rows' => 1,
    '#default_value' => t(variable_get('spambot_blocked_message_username', SPAMBOT_DEFAULT_BLOCKED_MESSAGE)),
    '#description' => t('Message to display when user action is blocked due to username.<br />The following tokens are available: <em>@email %email @username %username @ip %ip</em>'),
  );
  $form['messages']['spambot_blocked_message_ip'] = array(
    '#type' => 'textarea',
    '#title' => t('User registration blocked message (blocked ip address)'),
    '#rows' => 1,
    '#default_value' => t(variable_get('spambot_blocked_message_ip', SPAMBOT_DEFAULT_BLOCKED_MESSAGE)),
    '#description' => t('Message to display when user action is blocked due to ip address.<br />The following tokens are available: <em>@email %email @username %username @ip %ip</em>'),
  );

  // Fieldset for configure log rules.
  $form['logging'] = array(
    '#type' => 'fieldset',
    '#title' => t('Log information'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['logging']['spambot_log_blocked_registration'] = array(
    '#type' => 'checkbox',
    '#title' => t('Log information about blocked registrations into Drupal log'),
    '#default_value' => variable_get('spambot_log_blocked_registration', TRUE),
  );

  // StopFormSpam API key.
  $form['spambot_sfs_api_key'] = array(
    '#type' => 'textfield',
    '#title' => t('www.stopforumspam.com API key'),
    '#description' => t('If you wish to report spammers to Stop Forum Spam, you need to register for an API key at the <a href="http://www.stopforumspam.com">Stop Forum Spam</a> website.'),
    '#default_value' => variable_get('spambot_sfs_api_key', FALSE),
  );

  return system_settings_form($form);
}