<?php
  require_once('config.php');
  
  function botlog($info) {
    if ($file = fopen(LOGFILE, 'a'))
    {
      fwrite($file, $info);
      fclose($file);
    }
  }
  
  // Unrecoverable error, program must be terminated
  function error($message) {
    if (DEBUG) botlog("[EE] $message\n");
    die();
  }
  
  // Uncommon event
  function warning($message) {
    if (DEBUG) botlog("[WW] $message\n");
  }
  
  // Routine debugging informations
  function info($message) {
    if (DEBUG) botlog("[II] $message\n");
  }
    
  // Interpreta un comando inviato al bot - mettere null o simili invece di -1
  function getCommand($messaggio, $NoOffset = true) {
    if (!isset($messaggio->entities))
      return -1;
    foreach ($messaggio->entities as $entity) {
      if ($entity->type == "bot_command") {
        if ($NoOffset == true and $entity->offset != 0)
          return -1;
        //~ if (DEBUG) botlog("[II] Comando: ".$entity->offset. " ".$messaggio->text);
        //return substr($messaggio->text, $entity->offset, $entity->length);
        $ret['command'] = substr($messaggio->text, $entity->offset, $entity->length);
        $ret['options'] = substr($messaggio->text, $entity->length+$entity->offset+1);
        if (DEBUG) botlog("[II] Comando: ".$ret['command']."\n");
        return $ret;
      }
    }
    return -1;
  }
  
  // fabbrica una tabellina che in futuro sarà la pagina di calendario specificata da $mese e $anno
  function getCalendarTab ($month, $year) {
    $container = array();
    $riga = array();
    
    $days = array("L", "M", "M", "G", "V", "S", "D");
    
    for ($i = 0; $i < 7; $i++) {
      $element = array(
      "text" => "$days[$i]",
      "callback_data" => "null"
      );
      
      $riga[] = $element;
    }
    
    
    $container[] = $riga;
    $riga = array();
    
    $daysInMonth = cal_days_in_month (CAL_GREGORIAN , $month , $year);
    $date = $year."-".$month;
    $currentMonth = date('nY') == $month.$year; //magari anche l'anno?
    $startingDay = $currentMonth ? date('j') : 1;
    if (DEBUG) botlog("[II] First day: ".$date.'-'.$startingDay."\n"); 
    $firstDay    = date("N", strtotime($date.'-'.$startingDay));
    
    // blank buttons
    for ($i = 1; $i < $firstDay; $i++) {
      $element = array(
      "text" => " ",
      "callback_data" => "null"
      );
      
      $riga[] = $element;
    }
    
    for ($numDay = $startingDay; $numDay <= $daysInMonth; $numDay++, $i++) {
      //if ($today <= $numDay) {
        $element = array(
        "text" => "$numDay",
        "callback_data" => "$numDay"
        );
      //}
      //else {
       /* $element = array(
          "text" => " ",
          "callback_data" => "null"
          );*/
      //}
      
      $riga[] = $element;
      
      if ($i >= 7) {
        $container[] = $riga;
        $riga = array();
        $i = 0;
      }
    }
    
    // empty buttons 
    
    for (; $i > 1 and $i <= 7; $i++) {
      $element = array(
      "text" => " ",
      "callback_data" => "null"
      );
      
      $riga[] = $element;
    }
    
    if (!empty($riga)) {
      $container[] = $riga;
    }
    
    
    $container[] = array(
    $currentMonth ?
      array(
          "text" => " ",
          "callback_data" => "null"
          )
      :
      array(
          "text" => "<",
          "callback_data" => "<"
          ),
    array(
      "text" => "$EMOJI_X Annulla",
      "callback_data" => MSG_ABORT
      ),
    array(
      "text" => ">",
      "callback_data" => ">"
      ));
    
    return $container;
  }
  
  
  function not_authorized($chatID) {
    $query = API_URL . API_TOKEN . '/sendMessage?' .
      'chat_id=' . urlencode($chatID) .
      "&text=".urlencode("Utente non autorizzato\nhttps://www.youtube.com/watch?v=HO8ctP_QNZc");
      
    file_get_contents($query);
    
    die();
  }
  
  function wrong_action($chatID) {
    $query = API_URL . API_TOKEN . '/sendMessage?' .
      'chat_id=' . urlencode($chatID) .
      "&text=Azione non corretta";
      
    file_get_contents($query);
    
    die();
  }
?>