<?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 null;
    foreach ($messaggio->entities as $entity) {
      if ($entity->type == "bot_command") {
        if ($NoOffset == true and $entity->offset != 0)
          return null;
        //~ if (DEBUG) botlog("[II] Comando: ".$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);
        info("Command: $ret[command]");
        return $ret;
      }
    }
    return null;
  }
  
  /**** Telegram query functions ****/
  
  // return a message object, null if is error
  function sendMessage($chat_id, $text, $parse_mode = null, 
                       $disable_web_preview = false,
                       $disable_notification = false, 
                       $reply_to_message_id = null, 
                       $reply_markup = null) {
    $query = API_URL.API_TOKEN."/sendMessage?chat_id=".$chat_id.
          "&text=".urlencode($text);
          
    if ($parse_mode != null)   $query .= "&parse_mode=$parse_mode";
    if ($reply_markup != null) $query .= "&reply_markup=$reply_markup";
    if ($disable_web_preview != false) $query .= "&disable_web_preview=$disable_web_preview";
    if ($disable_notification != false) $query .= "&disable_notification=$disable_notification";
    if ($reply_to_message_id != null) $query .= "&reply_to_message_id=$reply_to_message_id";
    if ($reply_markup != null) $query .= "&reply_markup=$reply_markup";
    
    $answer = file_get_contents($query);
    if ($answer === false) warning("Something is wrong in sendMessage - chat_id: $chat_id - text: $text");
    return $answer;
  }
  
  //
  function forwardMessage($chat_id, $from_chat_id,
                       $message_id,
                       $disable_notification = false) {
                         
    $query = API_URL . API_TOKEN . "/forwardMessage?" .
            "chat_id=".urlencode($chat_id) .
            "&from_chat_id=" . urlencode($from_chat_id) .
            "&message_id=" . urlencode($message_id);
            
    if ($disable_notification != null) $query .= "&disable_notification=$disable_notification";

    $answer = file_get_contents($query);
    if ($answer === false) warning("Something is wrong in forwardMessage - chat_id: $chat_id - message_id: $message_id");
    return $answer;
  }

  // omitted "inline parameters", for inline bot funtions (not used here)
  function editMessageText($chat_id, $message_id, $text,
                    $parse_mode = null,
                    $disable_web_page_preview = false,
                    $reply_markup = null) {
    
    $query = API_URL . API_TOKEN . "/editMessageText?" .
            "chat_id=".urlencode($chat_id) .
            "&message_id=" . urlencode($message_id).
            "&text=" . urlencode($text);
            
    if ($disable_web_page_preview != null) $query .= "&disable_web_page_preview=$disable_web_page_preview";
    if ($reply_markup != null) $query .= "&reply_markup=$reply_markup";

    $answer = file_get_contents($query);
    if ($answer === false) warning("Something is wrong in editMessageText - chat_id: $chat_id - message_id: $message_id");
    return $answer;
  }
  
  //
  function deleteMessage($chat_id, $message_id) {
    
    $query = API_URL . API_TOKEN . "/deleteMessage?" .
            "chat_id=".urlencode($chat_id) .
            "&message_id=" . urlencode($message_id);
            
    $answer = file_get_contents($query);
    if ($answer === false) warning("Something is wrong in deleteMessage - chat_id: $chat_id - message_id: $message_id");
    return $answer;
  }
  
  function sendPhoto ($chat_id, $photo,
                      $caption = null,
                      $reply_markup = null,
                      $disable_notification = false, 
                      $reply_to_message_id = null  ) {
                        
    $query = API_URL . API_TOKEN . "/sendPhoto?" .
             "chat_id=".urlencode($chat_id) .
             "&photo=" . urlencode($photo);
             
    $query .= "&disable_notification=$disable_notification";
    if ($reply_to_message_id != null) $query .= "&reply_to_message_id=$disable_web_page_preview";
    if ($reply_markup != null) $query .= "&reply_markup=$reply_markup";
    if ($caption != null) $query .= "&caption=$caption";
    
    $answer = file_get_contents($query);
  }
  
  // Makes the calendar inline keyboard
  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;
    $isCurrentMonth = date('nY') == $month.$year;
    $startingDay = $isCurrentMonth ? date('j') : 1;
    if (DEBUG) botlog("[II] First day: ".$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(
    $isCurrentMonth ?
      array(
          "text" => " ",
          "callback_data" => "null"
          )
      :
      array(
          "text" => "<",
          "callback_data" => "<"
          ),
    array(
      "text" => "$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();
  }
?>