setup_alarm.php

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<?php

/******************************************************************** 
 * Copyright (c) 2006, Graham P Phillips
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright 
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the following 
 *     disclaimer in the documentation and/or other materials provided 
 *     with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 ********************************************************************/

include_once "php_params.php";
include_once "layout.php";

define('LOCALHOST', '127.0.0.1');  /* 127.0.0.1 is better than localhost */
define('LADD_PORT', 8888);
define('DB_USER', '');
define('LATCH_TYPE', "Latch Type");
define('CONTACT_TYPE', "Contact Type");
define('NORMALLY_CLOSED', "Normally Closed");
define('NORMALLY_OPEN', "Normally Open");


class Zone {
  var $id;
  var $name;
  var $enabled;
  var $alarm;
  var $latching;
  var $edge;     // an edge of 1 means "normally closed"

  function Zone($id,$name,$enabled, $alarm, $latching, $edge) {
    $this->id = $id;
    $this->name = $name;
    $this->enabled = $enabled;
    $this->alarm = $alarm;
    $this->latching = $latching;
    $this->edge = $edge;
  }
}


/***************************************************************
 * readZoneStatus():  Read the status of the alarm daemon and 
 * return an array of Zone structures.  
 *
 * Input:   An already opened connection to the alarm daemon. 
 * Return:  NULL          - on error 
 *          array of Zone - if successful 
 * Output:  An array of error messages if NULL is returned. 
 * Effects: none 
 **************************************************************/
function readZoneStatus($connection, &$error) {

  $command = "SELECT id, name, enabled, alarm, latching, edge FROM Zone";
  $result = pg_exec($connection, $command);
  if (!$result) {
     $error[] = "SQL command failed. Connected to \"" . LOCALHOST . "\" on port " . LADD_PORT . "."; 
     return NULL; 
  }

  $status = array();
  for ($row = 0; $row < pg_NumRows($result); $row++) {
    $status[] = new Zone(
      pg_result($result, $row, 0),  /* id */
      pg_result($result, $row, 1),  /* name */
      pg_result($result, $row, 2),  /* enabled */
      pg_result($result, $row, 3),  /* alarm */
      pg_result($result, $row, 4),  /* latching */
      pg_result($result, $row, 5)); /* edge */
  }
  return $status;
}


/* Reads the required zone config from web form.  
 * Returns an array of Zone structures.
 * Return NULL if the user did not do an update.
 */
function read_ui_zone_status() {
  $status = array();
  $params = read_params();
  for ($id = 1; $id <= 5; $id++) {
    if (!array_key_exists("Name_" . $id, $params))
       return NULL;
    if (!array_key_exists("Enabled_" . $id, $params))
       return NULL;
    if (!array_key_exists("Latching_" . $id, $params))
       return NULL;
    if (!array_key_exists("Edge_" . $id, $params))
       return NULL;
   
    $zone = new Zone(
      $id,  /* id */
      $params["Name_" . $id],   /* name */
      (strcasecmp($params["Enabled_" . $id], "Enabled") == 0)? 1 : 0,   /* enabled */
      -1,   /* alarm */
      (strcasecmp($params["Latching_" . $id], "Latching") == 0)? 1 : 0,   /* latching */
      (strcasecmp($params["Edge_" . $id], NORMALLY_CLOSED) == 0)? 1 : 0);   /* edge */

    $status[$id] = $zone;
  }
  return $status;
}

/* returns -1 on error.  
 * The statusArray is an array of Zones.  The zone->alarm is not used.  
 */
function set_zone_status($connection, $statusArray, &$error) {
  $someError = false; 
  for ($id = 1; $id <= 5; $id++) {
    $zone = $statusArray[$id];
    $command = "UPDATE Zone SET name=\"$zone->name\", enabled=$zone->enabled, latching=$zone->latching, edge=$zone->edge WHERE id=$id";
    $result = pg_exec($connection, $command);
    if (!$result) {
      $error[] = "SQL Command failed: $command"; 
      $someError = true;
    } else {
      pg_freeresult($result);
    }
  }
  return $someError? -1 : 0;
} 

// make common function
function displayErrorMsg($error) {

  $widget = "<h2>Error</h2>";
  foreach ($error as $msg) {
      $widget .= "$msg <br>\n";
  }
  display_page("Setup", "Alarm", $widget);
}


function generate_id_html($zone) {
  return "<td> $zone->id </td>"; 
}

function generate_name_html($zone) {
  return "<td> <input type=text name=Name_$zone->id value=\"$zone->name\" /> </td>"; 
}

function generate_enabled_html($zone) {
  // Mozilla doesn't seem to support selected.
  // IE does.
  if ($zone->enabled) 
    return "<td> <select name=Enabled_$zone->id> <option selected>Enabled</option> <option>Disabled</option> </select> </td>";
  else
    return "<td> <select name=Enabled_$zone->id> <option selected>Disabled</option> <option>Enabled</option> </select> </td>";
} 

function generate_latching_html($zone) {
  if ($zone->latching) 
    return "<td> <select name=Latching_$zone->id> <option selected>Latching</option> <option>Non-latching</option> </select> </td>";
  else
    return "<td> <select name=Latching_$zone->id> <option selected>Non-Latching</option> <option>Latching</option> </select> </td>";
} 

function generate_edge_html($zone) {
  // An edge of 1 means "normally closed". 
  if ($zone->edge) 
    return "<td> <select name=Edge_$zone->id> <option selected>" . NORMALLY_CLOSED . "</option> <option>" . NORMALLY_OPEN . "</option> </select> </td>";
  else 
    return "<td> <select name=Edge_$zone->id> <option selected>" . NORMALLY_OPEN. "</option> <option>" . NORMALLY_CLOSED . "</option> </select> </td>";
} 


function displayZoneForm($statusArray) {

$tableHeader = "<h2>Setup Alarm Zones</h2>
        <form action=\"setup_alarm.php\" method=post >
        <table>
          <tr>
            <th>
              Zone
            </th>
            <th>
              Name
            </th>
            <th>
              State
            </th>
            <th>" . 
              LATCH_TYPE .
	    "</th>
            <th>" . 
              CONTACT_TYPE .
            "</th>
          </tr>"; 

$tableFooter = <<< TABLE_FOOTER
        </table>
        <p>
          <input type="submit" name="Update" value="Update">
        </p>
        </form>
TABLE_FOOTER;


  $widget = $tableHeader; 
  foreach ($statusArray as $zone) {

    if ($zone->enabled && $zone->alarm)
       $status = 'Alarm';
    else if ($zone->enabled) 
       $status = 'Safe';
    else
       $status = 'Inactive';

    $idHtml = generate_id_html($zone);
    $nameHtml = generate_name_html($zone);
    $enabledHtml = generate_enabled_html($zone);
    $latchingHtml = generate_latching_html($zone);
    $edgeHtml = generate_edge_html($zone);

    switch ($status) {
    case 'Alarm':
      $widget .= "<tr class=menu2-color> " . $idHtml . $nameHtml . $enabledHtml .  $latchingHtml . $edgeHtml . "</tr>\n";
      break;

    default:
      $widget .= "<tr> " . $idHtml . $nameHtml . $enabledHtml .  $latchingHtml . $edgeHtml . "</tr>\n";
    }
  }
  $widget .= $tableFooter; 

  display_page("Setup", "Alarm", $widget);
}


/* Main function */

$error = array();

if (!function_exists('pg_connect')) {
     $error[] = "The pg_connect() function is not defined."; 
     $error[] = "This is probably because PHP on the web server was not configured with the --with-pgsql option."; 
     displayErrorMsg($error); 
     return; 
}


/* Suppress Postgres error messages */
error_reporting(error_reporting() & 0xFFFD);

$connection = pg_connect(LOCALHOST, LADD_PORT, DB_USER);
if (!$connection) {
  $error[] = "Unable to connect to daemon.  Attempted to connect to \"" . LOCALHOST . "\" on port " . LADD_PORT . "."; 
  displayErrorMsg($error); 
  return;
}

/* Read the new zone setting from UI form */
$statusArray = read_ui_zone_status();
if ($statusArray)
  set_zone_status($connection, $statusArray, $error); 

$statusArray = readZoneStatus($connection, $error);
if (!$statusArray) 
  displayErrorMsg($error); 
else
  displayZoneForm($statusArray); 

?>