<?php
App::uses('AppController', 'Controller');
/**
 * Monitors Controller
 *
 * @property Monitor $Monitor
 * @property PaginatorComponent $Paginator
 */
class MonitorsController extends AppController {

/**
 * Components
 *
 * @var array
 */
  public $components = array('Paginator', 'RequestHandler');

  public function beforeRender() {
    $this->set($this->Monitor->enumValues());
  }
  public function beforeFilter() {
    parent::beforeFilter();
    $canView = $this->Session->Read('monitorPermission');
    if ($canView == 'None') {
      throw new UnauthorizedException(__('Insufficient Privileges'));
      return;
    }
  }

/**
 * index method
 *
 * @return void
 */
  public function index() {
    $this->Monitor->recursive = 0;

    if ($this->request->params['named']) {  
      $this->FilterComponent = $this->Components->load('Filter');
      //$conditions = $this->FilterComponent->buildFilter($this->request->params['named']);
      $conditions = $this->request->params['named'];
    } else {
      $conditions = array();
    }

    $allowedMonitors=preg_split ('@,@', $this->Session->Read('allowedMonitors'),NULL, PREG_SPLIT_NO_EMPTY);
    if (!empty($allowedMonitors)) {
      $conditions['Monitor.Id' ] = $allowedMonitors;
    }
    $find_array = array('conditions'=>$conditions,'contain'=>array('Group'));

    if ( isset( $conditions['GroupId'] ) ) {
      $find_array['joins'] = array(
        array(
          'table' => 'Groups_Monitors',
          'type' => 'inner',
          'conditions' => array(
            'Groups_Monitors.MonitorId = Monitor.Id'
          ),
        ),
        //array(
          //'table' => 'Groups',
          //'type' => 'inner',
          //'conditions' => array(
            //'Groups.Id = Groups_Monitors.GroupId',
            //'Groups.Id' => $this->request->params['GroupId'],
          //),
        //)
      );
    }
    $monitors = $this->Monitor->find('all',$find_array);
    $this->set(array(
          'monitors' => $monitors,
          '_serialize' => array('monitors')
          ));
  }

/**
 * view method
 *
 * @throws NotFoundException
 * @param string $id
 * @return void
 */
  public function view($id = null) {
    $this->Monitor->recursive = 0;
    if (!$this->Monitor->exists($id)) {
      throw new NotFoundException(__('Invalid monitor'));
    }
    $allowedMonitors=preg_split ('@,@', $this->Session->Read('allowedMonitors'),NULL, PREG_SPLIT_NO_EMPTY);
    if (!empty($allowedMonitors)) {
      $restricted = array('Monitor.' . $this->Monitor->primaryKey => $allowedMonitors);
    } else {
      $restricted = '';
    }
    
    $options = array('conditions' => array( 
          array('Monitor.' . $this->Monitor->primaryKey => $id),
          $restricted
          )
        );
    $monitor = $this->Monitor->find('first', $options);
    $this->set(array(
      'monitor' => $monitor,
      '_serialize' => array('monitor')
    ));
  }

/**
 * add method
 *
 * @return void
 */
  public function add() {
    if ( $this->request->is('post') ) {

      if ( $this->Session->Read('systemPermission') != 'Edit' ) {
         throw new UnauthorizedException(__('Insufficient privileges'));
        return;
      }

      $this->Monitor->create();
      if ($this->Monitor->save($this->request->data)) {
        $this->daemonControl($this->Monitor->id, 'start');
        //return $this->flash(__('The monitor has been saved.'), array('action' => 'index'));
        $message = 'Saved';
      } else {
        $message = 'Error';
      }
      $this->set(array(
        'message' => $message,
        '_serialize' => array('message')
      ));
    }
  }

/**
 * edit method
 *
 * @throws NotFoundException
 * @param string $id
 * @return void
 */
  public function edit($id = null) {
    $this->Monitor->id = $id;

    if (!$this->Monitor->exists($id)) {
      throw new NotFoundException(__('Invalid monitor'));
    }
    if ($this->Session->Read('monitorPermission') != 'Edit') {
      throw new UnauthorizedException(__('Insufficient privileges'));
      return;
    }

    $message = '';
    if ( $this->Monitor->save($this->request->data) ) {
      $message = 'Saved';
      $Monitor = $this->Monitor->find('first', array(
        'fields' => array('Function','ServerId'),
        'conditions' => array('Id' => $id)
      ))['Monitor'];

      // - restart or stop this monitor after change
      $func = $Monitor['Function'];
      // We don't pass the request data as the monitor object because it may be a subset of the full monitor array
      $this->daemonControl( $this->Monitor->id, 'stop' );
      if ( ( $func != 'None' ) and ( (!defined('ZM_SERVER_ID')) or ($Monitor['ServerId']==ZM_SERVER_ID) ) ) {
        $this->daemonControl( $this->Monitor->id, 'start' );
      }
    } else {
      $message = 'Error ' . print_r($this->Monitor->invalidFields(), true);
    }

    $this->set(array(
      'message' => $message,
      '_serialize' => array('message')
    ));

  } // end function edit

/**
 * delete method
 *
 * @throws NotFoundException
 * @param string $id
 * @return void
 */
  public function delete($id = null) {
    $this->Monitor->id = $id;
    if (!$this->Monitor->exists()) {
      throw new NotFoundException(__('Invalid monitor'));
    }
    if ($this->Session->Read('systemPermission') != 'Edit') {
       throw new UnauthorizedException(__('Insufficient privileges'));
      return;
    }
    $this->request->allowMethod('post', 'delete');

    $this->daemonControl($this->Monitor->id, 'stop');

    if ($this->Monitor->delete()) {
      return $this->flash(__('The monitor has been deleted.'), array('action' => 'index'));
    } else {
      return $this->flash(__('The monitor could not be deleted. Please, try again.'), array('action' => 'index'));
    }
  }

  public function sourceTypes() {
    $sourceTypes = $this->Monitor->query("describe Monitors Type;");

    preg_match('/^enum\((.*)\)$/', $sourceTypes[0]['COLUMNS']['Type'], $matches);
    foreach( explode(',', $matches[1]) as $value ) {
      $enum[] = trim( $value, "'" );
    }

    $this->set(array(
      'sourceTypes' => $enum,
      '_serialize' => array('sourceTypes')
    ));
  }

  // arm/disarm alarms
  // expected format: http(s):/portal-api-url/monitors/alarm/id:M/command:C.json
  // where M=monitorId
  // where C=on|off|status
  public function alarm() {
    $id = $this->request->params['named']['id'];
    $cmd = strtolower($this->request->params['named']['command']);
    if (!$this->Monitor->exists($id)) {
      throw new NotFoundException(__('Invalid monitor'));
    }
    if ( $cmd != 'on' && $cmd != 'off' && $cmd != 'status' ) {
      throw new BadRequestException(__('Invalid command'));
    }
    $zm_path_bin = Configure::read('ZM_PATH_BIN');

    switch ($cmd) {
      case 'on':
        $q = '-a';
        $verbose = '-v';
        break;
      case 'off':
        $q = '-c';
        $verbose = '-v';
        break;
      case 'status':
        $verbose = ''; // zmu has a bug - gives incorrect verbose output in this case
        $q = '-s';
        break;      
    }

    // form auth key based on auth credentials
    $this->loadModel('Config');
    $options = array('conditions' => array('Config.' . $this->Config->primaryKey => 'ZM_OPT_USE_AUTH'));
                $config = $this->Config->find('first', $options);
    $zmOptAuth = $config['Config']['Value'];


    $options = array('conditions' => array('Config.' . $this->Config->primaryKey => 'ZM_AUTH_RELAY'));
                $config = $this->Config->find('first', $options);
    $zmAuthRelay = $config['Config']['Value'];
  
    $auth='';
    if ( $zmOptAuth ) {
      if ( $zmAuthRelay == 'hashed' ) {
        $options = array('conditions' => array('Config.' . $this->Config->primaryKey => 'ZM_AUTH_HASH_SECRET'));
                    $config = $this->Config->find('first', $options);
        $zmAuthHashSecret = $config['Config']['Value'];

        $time = localtime();
        $ak = $zmAuthHashSecret.$this->Session->Read('username').$this->Session->Read('passwordHash').$time[2].$time[3].$time[4].$time[5];
        $ak = md5($ak);
        $auth = ' -A '.$ak;
      } else if ( $zmAuthRelay == 'plain' ) {
        $auth = ' -U ' .$this->Session->Read('username').' -P '.$this->Session->Read('password');
        
      } else if ( $zmAuthRelay == 'none' ) {
        $auth = ' -U ' .$this->Session->Read('username');
      }
    }
    
    $shellcmd = escapeshellcmd("$zm_path_bin/zmu $verbose -m$id $q $auth");
    $status = exec ($shellcmd);

    $this->set(array(
      'status' => $status,
      '_serialize' => array('status'),
    ));
  }

  // Check if a daemon is running for the monitor id
  public function daemonStatus() {
    $id = $this->request->params['named']['id'];
    $daemon = $this->request->params['named']['daemon'];

    if (!$this->Monitor->exists($id)) {
      throw new NotFoundException(__('Invalid monitor'));
    }

    $monitor = $this->Monitor->find('first', array(
      'fields' => array('Id', 'Type', 'Device'),
      'conditions' => array('Id' => $id)
    ));

    // Clean up the returned array
    $monitor = Set::extract('/Monitor/.', $monitor);

    // Pass -d for local, otherwise -m
    if ($monitor[0]['Type'] == 'Local') {
      $args = '-d '. $monitor[0]['Device'];  
    } else {
      $args = '-m '. $monitor[0]['Id'];
    }

    // Build the command, and execute it
    $zm_path_bin = Configure::read('ZM_PATH_BIN');
    $command = escapeshellcmd("$zm_path_bin/zmdc.pl status $daemon $args");
    $status = exec( $command );

    // If 'not' is present, the daemon is not running, so return false
    // https://github.com/ZoneMinder/ZoneMinder/issues/799#issuecomment-108996075
    // Also sending back the status text so we can check if the monitor is in pending
    // state which means there may be an error
    $statustext = $status;
    $status = (strpos($status, 'not')) ? false : true;

    $this->set(array(
      'status' => $status,
      'statustext' => $statustext,
      '_serialize' => array('status','statustext'),
    ));
  }

  public function daemonControl($id, $command, $monitor=null, $daemon=null) {
    $daemons = array();

    if ( !$monitor ) {
      // Need to see if it is local or remote
      $monitor = $this->Monitor->find('first', array(
        'fields' => array('Type', 'Function', 'Device'),
        'conditions' => array('Id' => $id)
      ));
      $monitor = $monitor['Monitor'];
    }

    if ( $monitor['Function'] == 'Monitor' ) {
      array_push($daemons, 'zmc');
    } else {
      array_push($daemons, 'zmc', 'zma');
    }
    
    $zm_path_bin = Configure::read('ZM_PATH_BIN');

    foreach ($daemons as $daemon) {
      $args = '';
      if ( $daemon == 'zmc' and $monitor['Type'] == 'Local') {
        $args = '-d ' . $monitor['Device'];
      } else {
        $args = '-m ' . $id;
      }

      $shellcmd = escapeshellcmd("$zm_path_bin/zmdc.pl $command $daemon $args");
      $status = exec( $shellcmd );
    }
  }

} // end class MonitorsController