guestbook.module

<?php
module_load_include('inc', 'guestbook', 'include/guestbook_db');
module_load_include('inc', 'guestbook', 'include/guestbook_core');
module_load_include('inc', 'guestbook', 'include/guestbook.theme');
module_load_include('inc', 'guestbook', 'include/guestbook_weather');

/**
* @file
* Build page, form for guestbook and weather block.
*/

/**
* Implements hook_menu(). 
*/
 function guestbook_menu() {
   $items = array();
   // Main page.
   $items['guestbook-page'] = array(
     'title' => 'Guestbook',
     'page callback'   => 'drupal_get_form',
     'page arguments'  => array('guestbook_page_form'),
     'access callback' => TRUE,
  );
   // Edit message.
   $items['guestbook-page/%mid/edit'] = array(
     'title'            => 'Guestbook',
     'page callback'    => 'drupal_get_form',
     'page arguments'   => array('guestbook_page_form', 1),
     'access callback'  => TRUE,
     'type'             => MENU_CALLBACK,

   );
   // Delete message.
   $items['guestbook-page/%mid/delete'] = array(
     'title'            => 'Delete message',
     'page callback'    => 'guestbook_message_delete',
     'page arguments'   => array(1),
     'access callback'  => TRUE,
     'type'             => MENU_CALLBACK,
   );
   return $items;
}

/**
 * Implements hook_form.
 *
 * @param $value
 *   Implements hook_load
 *   contains array('id', 'uid', 'sid', 'date', 'message').
 * @return
 *   Return form.
 */
function guestbook_page_form($form, $form_state, $value= NULL) {
  global $user;
  // Text for editing.
  $text_edit = NULL;

  // Get html list of messages.
  $text = guestbook_html();

  $form = [];

  if (isset($value['id'])) {
    // Get tex for editing.
    $text_edit = $value['message'];
    $form['infoById'] = array('#type' => 'value', '#value' => $value);
  }

  $form['#attached']['css'][] = drupal_get_path('module', 'guestbook') . '/css/guestbook.css';

  $form['message_window'] = [
    // Show messages if it exists.
    '#markup' => $text,
  ];

  // Show area for input text if user is logged.
  if ($user->uid) {
    $form['message'] = [
      '#type' => 'textarea',
      '#title' => t('message'),
      '#size' => 1000,
      '#default_value' => $text_edit,
    ];

    $form['submit'] = [
      '#type' => 'submit',
      '#attributes' => array('class' => array('guestbook-button')),
      '#value' => isset($value['id']) ? t('Edit') : t('Save'),
    ];

    // Show or hide the cancel button.
    if (isset($value['id'])) {
      $form['cancel_button'] = [
        '#type' => 'link',
        '#title' => t('Cancel'),
        '#href' => 'guestbook-page',
        '#options' => array('query' => drupal_get_query_parameters()),
        '#attributes' => array('class' => array('guestbook-button')),

      ];
    }
  }
  return $form;
}

/**
 * Validate guestbook_page_form.
*/
function guestbook_page_form_validate($form, &$form_state) {
  if (drupal_strlen($form_state['values']['message']) > 1000 || empty($form_state['values']['message'])) {
    form_set_error('message', t('Field "@fieldname" must be less than @c chars and cant be empty .',
      array('@fieldname' => t('message'), '@c' => 1000)));
  }
}

/**
 * Submit for guestbook_page_form.
 */
function guestbook_page_form_submit($form, &$form_state) {
  guestbook_save_edit_db($form_state);
}

/**
 * Loads a message info.
 *
 * @param $mid
 *   Integer specifying the message id to load.
 * @return
 *   A fully-loaded array of message info ('id', 'uid', 'sid', 'date', 'message').
 *   id - message id; uid - user id; sid - session id; date - message creation date; message - message text.
 */
function mid_load($mid) {
  $query = db_select('guestbook_drupal', 't')
    ->fields('t', array('id', 'uid', 'sid', 'date', 'message'))
    ->condition('t.id', $mid)
    ->execute();
  $value = $query->fetchAssoc();
  return $value;
}

/*
 * Implements hook_cron().
 */
function guestbook_cron() {
  guestbook_get_xml_weather();
}

/*
 * Implements hook_block_info().
 */
function guestbook_block_info() {
  // Build weather block.
  $blocks['weather'] = array(
    'info' => t('The Weather'),
    'cache' => DRUPAL_CACHE_GLOBAL,
    'region' => 'sidebar_first',
    'status' => TRUE,
    'weight' => -10,
  );
  return $blocks;
}

/*
 * Implements hook_block_view().
 */
function guestbook_block_view($delta = '') {
  $block = [];
  switch($delta){

    case 'weather':
      $block['subject'] = t('Vitebsk Weather');
      // Get prepared html data.
      $block['content'] = guestbook_weather();
      break;
  }
  return $block;
}