<?php
//
// ZoneMinder web timeline view file, $Date$, $Revision$
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//

if ( !canView( 'Events' ) ) {
  $view = 'error';
  return;
}

foreach ( getSkinIncludes( 'includes/timeline_functions.php' ) as $includeFile )
  require_once $includeFile;

//
// Date/time formats used in charts 
//
// These are the time axis range text. The first of each pair is the start date/time
// and the second is the last so often contains additional information
//

// When the chart range is years
define( 'STRF_TL_AXIS_RANGE_YEAR1', '%b %Y' );
define( 'STRF_TL_AXIS_RANGE_YEAR2', STRF_TL_AXIS_RANGE_YEAR1 );

// When the chart range is months
define( "STRF_TL_AXIS_RANGE_MONTH1", "%b" );
define( "STRF_TL_AXIS_RANGE_MONTH2", STRF_TL_AXIS_RANGE_MONTH1." %Y" );

// When the chart range is days
define( "STRF_TL_AXIS_RANGE_DAY1", "%d" );
define( "STRF_TL_AXIS_RANGE_DAY2", STRF_TL_AXIS_RANGE_DAY1." %b %Y" );

// When the chart range is less than a day
define( "STRF_TL_AXIS_RANGE_TIME1", "%H:%M" );
define( "STRF_TL_AXIS_RANGE_TIME2", STRF_TL_AXIS_RANGE_TIME1.", %d %b %Y" );

//
// These are the time axis tick labels
//
define( "STRF_TL_AXIS_LABEL_YEAR", "%Y" );
define( "STRF_TL_AXIS_LABEL_MONTH", "%M" );
define( "STRF_TL_AXIS_LABEL_WEEK", "%d/%m" );
define( "STRF_TL_AXIS_LABEL_DAY", "%d" );
define( "STRF_TL_AXIS_LABEL_4HOUR", "%H:00" );
define( "STRF_TL_AXIS_LABEL_HOUR", "%H:00" );
define( "STRF_TL_AXIS_LABEL_10MINUTE", "%H:%M" );
define( "STRF_TL_AXIS_LABEL_MINUTE", "%H:%M" );
define( "STRF_TL_AXIS_LABEL_10SECOND", "%S" );
define( "STRF_TL_AXIS_LABEL_SECOND", "%S" );

$mouseover = true;
if ( !isset($mouseover) )
  $mouseover = true;

$mode = 'overlay';
if ( !isset($mode) )
  $mode = 'overlay';

$minEventWidth = 3;
$maxEventWidth = 6;

$chart = array(
    "width"=>700,
    "height"=>460,
    "image" => array(
      "width"=>264,
      "height"=>220,
      "topOffset"=>20,
      ),
    "imageText" => array(
      "width"=>400,
      "height"=>30,
      "topOffset"=>20,
      ),
    "graph" => array(
      "width"=>600,
      "height"=>160,
      "topOffset"=>30,
      ),
    "title" => array(
      "topOffset"=>50
      ),
    "key" => array(
        "topOffset"=>50
        ),
    "axes" => array(
        "x" => array(
          "height" => 20,
          ),
        "y" => array(
          "width" => 30,
          ),
        ),
    "grid" => array(
        "x" => array(
          "major" => array(
            "max" => 12,
            "min" => 4,
            ),
          "minor" => array(
            "max" => 48,
            "min" => 12,
            ),
          ),
        "y" => array(
          "major" => array(
            "max" => 8,
            "min" => 1,
            ),
          "minor" => array(
            "max" => 0,
            "min" => 0,
            ),
          ),
        ),
);

$monitors = array();
$monitorsSql = 'SELECT * FROM Monitors ORDER BY Sequence ASC';
//srand( 97981 );
foreach( dbFetchAll( $monitorsSql ) as $row ) {
  //if ( empty($row['WebColour']) )
  //{
      //$row['WebColour'] = sprintf( "#%02x%02x%02x", rand( 0, 255 ), rand( 0, 255), rand( 0, 255 ) );
  //}
  $monitors[$row['Id']] = $row;
}

# The as E, and joining with Monitors is required for the filterSQL filters.
$rangeSql = 'SELECT min(E.StartTime) AS MinTime, max(E.EndTime) AS MaxTime FROM Events AS E INNER JOIN Monitors AS M ON (E.MonitorId = M.Id) WHERE NOT isnull(E.StartTime) AND NOT isnull(E.EndTime)';
$eventsSql = 'SELECT * FROM Events AS E WHERE NOT isnull(StartTime)';

if ( !empty($user['MonitorIds']) ) {
  $monFilterSql = ' AND MonitorId IN ('.$user['MonitorIds'].')';

  $rangeSql .= $monFilterSql;
  $eventsSql .= $monFilterSql;
}

if ( isset($_REQUEST['filter']) )
  $tree = parseFilterToTree( $_REQUEST['filter'] );
else
  $tree = false;

if ( isset($_REQUEST['range']) )
  $range = validHtmlStr($_REQUEST['range']);
if ( isset($_REQUEST['minTime']) )
  $minTime = validHtmlStr($_REQUEST['minTime']);
if ( isset($_REQUEST['midTime']) )
  $midTime = validHtmlStr($_REQUEST['midTime']);
if ( isset($_REQUEST['maxTime']) )
  $maxTime = validHtmlStr($_REQUEST['maxTime']);

if ( isset($range) ) {
  $halfRange = (int)($range/2);
  if ( isset($midTime) ) {
    $midTimeT = strtotime($midTime);
    $minTimeT = $midTimeT-$halfRange; 
    $maxTimeT = $midTimeT+$halfRange; 
    if ( !($range%1) ) {
      $maxTimeT--;
    }
    $minTime = strftime( STRF_FMT_DATETIME_DB, $minTimeT );
    $maxTime = strftime( STRF_FMT_DATETIME_DB, $maxTimeT );
  } elseif ( isset($minTime) ) {
    $minTimeT = strtotime($minTime);
    $maxTimeT = $minTimeT + $range;
    $midTimeT = $minTimeT + $halfRange;
    $midTime = strftime( STRF_FMT_DATETIME_DB, $midTimeT );
    $maxTime = strftime( STRF_FMT_DATETIME_DB, $maxTimeT );
  } elseif ( isset($maxTime) ) {
    $maxTimeT = strtotime($maxTime);
    $minTimeT = $maxTimeT - $range;
    $midTimeT = $minTimeT + $halfRange;
    $minTime = strftime( STRF_FMT_DATETIME_DB, $minTimeT );
    $midTime = strftime( STRF_FMT_DATETIME_DB, $midTimeT );
  }
} elseif ( isset($minTime) && isset($maxTime) ) {
  $minTimeT = strtotime($minTime);
  $maxTimeT = strtotime($maxTime);
  $range = ($maxTimeT - $minTimeT) + 1;
  $halfRange = (int)($range/2);
  $midTimeT = $minTimeT + $halfRange;
  $midTime = strftime( STRF_FMT_DATETIME_DB, $midTimeT );
}

if ( isset($minTime) && isset($maxTime) ) {
  $tempMinTime = $tempMaxTime = $tempExpandable = false;
  extractDatetimeRange( $tree, $tempMinTime, $tempMaxTime, $tempExpandable );
  $filterSql = parseTreeToSQL( $tree );

  if ( $filterSql ) {
    $filterSql = " and $filterSql";
    $eventsSql .= $filterSql;
  }
} else {
  $filterSql = parseTreeToSQL( $tree );
  $tempMinTime = $tempMaxTime = $tempExpandable = false;
  extractDatetimeRange( $tree, $tempMinTime, $tempMaxTime, $tempExpandable );

  if ( $filterSql ) {
    $filterSql = " and $filterSql";
    $rangeSql .= $filterSql;
    $eventsSql .= $filterSql;
  }

  if ( !isset($minTime) || !isset($maxTime) ) {
    // Dynamically determine range
    $row = dbFetchOne( $rangeSql );

    if ( !isset($minTime) )
      $minTime = $row['MinTime'];
    if ( !isset($maxTime) )
      $maxTime = $row['MaxTime'];
  }

  if ( empty($minTime) )
    $minTime = $tempMinTime;
  if ( empty($maxTime) )
    $maxTime = $tempMaxTime;
  if ( empty($maxTime) )
    $maxTime = "now";

  $minTimeT = strtotime($minTime);
  $maxTimeT = strtotime($maxTime);
  $range = ($maxTimeT - $minTimeT) + 1;
  $halfRange = (int)($range/2);
  $midTimeT = $minTimeT + $halfRange;
  $midTime = strftime( STRF_FMT_DATETIME_DB, $midTimeT );
}

//echo "MnT: $tempMinTime, MxT: $tempMaxTime, ExP: $tempExpandable<br>";
if ( $tree ) {
  appendDatetimeRange( $tree, $minTime, $maxTime );

  $filterQuery = parseTreeToQuery( $tree );
} else {
  $filterQuery = false;
}

$scales = array(
  array( "name"=>"year",     "factor"=>60*60*24*365, "align"=>1,  "zoomout"=>2,    "label"=>STRF_TL_AXIS_LABEL_YEAR ),
  array( "name"=>"month",    "factor"=>60*60*24*30,  "align"=>1,  "zoomout"=>12,   "label"=>STRF_TL_AXIS_LABEL_MONTH ),
  array( "name"=>"week",     "factor"=>60*60*24*7,   "align"=>1,  "zoomout"=>4.25, "label"=>STRF_TL_AXIS_LABEL_WEEK,     "labelCheck"=>"%W" ),
  array( "name"=>"day",      "factor"=>60*60*24,     "align"=>1,  "zoomout"=>7,    "label"=>STRF_TL_AXIS_LABEL_DAY ),
  array( "name"=>"hour4",    "factor"=>60*60,        "align"=>4,  "zoomout"=>6,    "label"=>STRF_TL_AXIS_LABEL_4HOUR,    "labelCheck"=>"%H" ),
  array( "name"=>"hour",     "factor"=>60*60,        "align"=>1,  "zoomout"=>4,    "label"=>STRF_TL_AXIS_LABEL_HOUR,     "labelCheck"=>"%H" ),
  array( "name"=>"minute10", "factor"=>60,           "align"=>10, "zoomout"=>6,    "label"=>STRF_TL_AXIS_LABEL_10MINUTE, "labelCheck"=>"%M" ),
  array( "name"=>"minute",   "factor"=>60,           "align"=>1,  "zoomout"=>10,   "label"=>STRF_TL_AXIS_LABEL_MINUTE,   "labelCheck"=>"%M" ),
  array( "name"=>"second10", "factor"=>1,            "align"=>10, "zoomout"=>6,    "label"=>STRF_TL_AXIS_LABEL_10SECOND ),
  array( "name"=>"second",   "factor"=>1,            "align"=>1,  "zoomout"=>10,   "label"=>STRF_TL_AXIS_LABEL_SECOND ),
);

$majXScale = getDateScale( $scales, $range, $chart['grid']['x']['major']['min'], $chart['grid']['x']['major']['max'] );

// Adjust the range etc for scale
$minTimeT -= $minTimeT%($majXScale['factor']*$majXScale['align']);
$minTime = strftime( STRF_FMT_DATETIME_DB, $minTimeT );
$maxTimeT += (($majXScale['factor']*$majXScale['align'])-$maxTimeT%($majXScale['factor']*$majXScale['align']))-1;
if ( $maxTimeT > time() )
  $maxTimeT = time();
$maxTime = strftime( STRF_FMT_DATETIME_DB, $maxTimeT );
$range = ($maxTimeT - $minTimeT) + 1;
$halfRange = (int)($range/2);
$midTimeT = $minTimeT + $halfRange;
$midTime = strftime( STRF_FMT_DATETIME_DB, $midTimeT );

//echo "R:$range<br>";
//echo "MnT:$minTime<br>";
//echo "MnTt:$minTimeT<br>";
//echo "MdT:$midTime<br>";
//echo "MdTt:$midTimeT<br>";
//echo "MxT:$maxTime<br>";
//echo "MxTt:$maxTimeT<br>";

if ( isset($minTime) && isset($maxTime) ) {
    $eventsSql .= " and EndTime >= '$minTime' and StartTime <= '$maxTime'";
}

$eventsSql .= " order by Id asc";
//echo "ESQL: $eventsSql<br>";

$chart['data'] = array(
  "x" => array(
    "lo" => strtotime( $minTime ),
    "hi" => strtotime( $maxTime ),
  ),
  "y" => array(
    "lo" => 0,
    "hi" => 0,
  )
);

$chart['data']['x']['range'] = ($chart['data']['x']['hi'] - $chart['data']['x']['lo']) + 1;
$chart['data']['x']['density'] = $chart['data']['x']['range']/$chart['graph']['width'];

$monEventSlots = array();
$monFrameSlots = array();
$monitorIds = array();
foreach( dbFetchAll( $eventsSql ) as $event ) {
  if ( !isset($monitorIds[$event['MonitorId']]) )
    $monitorIds[$event['MonitorId']] = true;

  if ( !isset($monEventSlots[$event['MonitorId']]) )
    $monEventSlots[$event['MonitorId']] = array();

  if ( !isset($monFrameSlots[$event['MonitorId']]) )
    $monFrameSlots[$event['MonitorId']] = array();

  $currEventSlots = &$monEventSlots[$event['MonitorId']];
  $currFrameSlots = &$monFrameSlots[$event['MonitorId']];

  $startTimeT = strtotime($event['StartTime']);
  $startIndex = $rawStartIndex = (int)(($startTimeT - $chart['data']['x']['lo']) / $chart['data']['x']['density']);
  if ( $startIndex < 0 )
    $startIndex = 0;

  if ( isset($event['EndTime']) )
    $endTimeT = strtotime($event['EndTime']);
  else
    $endTimeT = time();
  $endIndex = $rawEndIndex = (int)(($endTimeT - $chart['data']['x']['lo']) / $chart['data']['x']['density']);

  if ( $endIndex >= $chart['graph']['width'] )
    $endIndex = $chart['graph']['width'] - 1;

  for ( $i = $startIndex; $i <= $endIndex; $i++ ) {
    if ( !isset($currEventSlots[$i]) ) {
      if ( $rawStartIndex == $rawEndIndex ) {
        $offset = 1;
      } else {
        $offset = 1 + ($event['Frames']?((int)(($event['Frames']-1)*(($i-$rawStartIndex)/($rawEndIndex-$rawStartIndex)))):0);
      }
      $currEventSlots[$i] = array( "count"=>0, "width"=>1, "offset"=>$offset, "event"=>$event );
    } else {
      $currEventSlots[$i]['count']++;
    }
  }
  if ( $event['MaxScore'] > 0 ) {
    if ( $startIndex == $endIndex ) {
      $framesSql = 'SELECT FrameId,Score FROM Frames WHERE EventId = ? AND Score > 0 ORDER BY Score DESC LIMIT 1';
      $frame = dbFetchOne( $framesSql, NULL, array($event['Id']) );

      $i = $startIndex;
      if ( !isset($currFrameSlots[$i]) ) {
        $currFrameSlots[$i] = array( 'count'=>1, 'value'=>$event['MaxScore'], 'event'=>$event, 'frame'=>$frame );
      } else {
        $currFrameSlots[$i]['count']++;
        if ( $event['MaxScore'] > $currFrameSlots[$i]['value'] ) {
          $currFrameSlots[$i]['value'] = $event['MaxScore'];
          $currFrameSlots[$i]['event'] = $event;
          $currFrameSlots[$i]['frame'] = $frame;
        }
      }
      if ( $event['MaxScore'] > $chart['data']['y']['hi'] ) {
        $chart['data']['y']['hi'] = $event['MaxScore'];
      }
    } else {
      $framesSql = 'SELECT FrameId,Delta,unix_timestamp(TimeStamp) AS TimeT,Score FROM Frames WHERE EventId = ? AND Score > 0';
      $result = dbQuery( $framesSql, array( $event['Id'] ) );
      while( $frame = dbFetchNext( $result ) ) {
        if ( $frame['Score'] == 0 )
          continue;
        $frameTimeT = $frame['TimeT'];
        $frameTimeT = $startTimeT + $frame['Delta'];
        $frameIndex = (int)(($frameTimeT - $chart['data']['x']['lo']) / $chart['data']['x']['density']);
        if ( $frameIndex < 0 )
          continue;
        if ( $frameIndex >= $chart['graph']['width'] )
          continue;

        if ( !isset($currFrameSlots[$frameIndex]) ) {
          $currFrameSlots[$frameIndex] = array( 'count'=>1, 'value'=>$frame['Score'], 'event'=>$event, 'frame'=>$frame );
        } else {
          $currFrameSlots[$frameIndex]['count']++;
          if ( $frame['Score'] > $currFrameSlots[$frameIndex]['value'] ) {
            $currFrameSlots[$frameIndex]['value'] = $frame['Score'];
            $currFrameSlots[$frameIndex]['event'] = $event;
            $currFrameSlots[$frameIndex]['frame'] = $frame;
          }
        }
        if ( $frame['Score'] > $chart['data']['y']['hi'] ) {
          $chart['data']['y']['hi'] = $frame['Score'];
        }
      } // end foreach frame
    }
  } // end if MaxScore > 0
} // end foreach event

ksort( $monitorIds, SORT_NUMERIC );
ksort( $monEventSlots, SORT_NUMERIC );
ksort( $monFrameSlots, SORT_NUMERIC );

// No longer needed?
if ( false ) {
  // Add on missing frames
  foreach( array_keys($monFrameSlots) as $monitorId ) {
    unset( $currFrameSlots );
    $currFrameSlots = &$monFrameSlots[$monitorId];
    for ( $i = 0; $i < $chart['graph']['width']; $i++ ) {
      if ( isset($currFrameSlots[$i]) ) {
        if ( !isset($currFrameSlots[$i]['frame']) ) {
          $framesSql = "select FrameId,Score from Frames where EventId = ? and Score > 0 order by FrameId limit 1";
          $currFrameSlots[$i]['frame'] = dbFetchOne( $framesSql, NULL, array( $currFrameSlots[$i]['event']['Id'] ) );
        }
      }
    }
  }
}

$chart['data']['y']['range'] = ($chart['data']['y']['hi'] - $chart['data']['y']['lo']) + 1;
$chart['data']['y']['density'] = $chart['data']['y']['range']/$chart['graph']['height'];

$majYScale = getYScale( $chart['data']['y']['range'], $chart['grid']['y']['major']['min'], $chart['grid']['y']['major']['max'] );

$maxWidth = 0;
$maxHeight = 0;

foreach ( array_keys($monitorIds) as $monitorId ) {
  if ( $maxWidth < $monitors[$monitorId]['Width'] )
    $maxWidth = $monitors[$monitorId]['Width'];
  if ( $maxHeight < $monitors[$monitorId]['Height'] )
    $maxHeight = $monitors[$monitorId]['Height'];
}

//print_r( $monEventSlots );
// Optimise boxes
foreach( array_keys($monEventSlots) as $monitorId ) {
  unset( $currEventSlots );
  $currEventSlots = &$monEventSlots[$monitorId];
  for ( $i = 0; $i < $chart['graph']['width']; $i++ ) {
    if ( isset($currEventSlots[$i]) ) {
      if ( isset($currSlot) ) {
        if ( $currSlot['event']['Id'] == $currEventSlots[$i]['event']['Id'] ) {
          if ( $currSlot['width'] < $maxEventWidth ) {
            // Merge slots for the same long event
            $currSlot['width']++;
            unset( $currEventSlots[$i] );
            continue;
          } elseif ( $currSlot['offset'] < $currEventSlots[$i]['offset'] ) {
            // Split very long events
            $currEventSlots[$i]['frame'] = array( 'FrameId'=>$currEventSlots[$i]['offset'] );
          }
        } elseif ( $currSlot['width'] < $minEventWidth ) {
          // Merge multiple small events
          $currSlot['width']++;
          unset( $currEventSlots[$i] );
          continue;
        }
      }
      $currSlot = &$currEventSlots[$i];
    } else {
      unset( $currSlot );
    }
  }
  if ( isset( $currSlot ) )
    unset( $currSlot );
}
//print_r( $monEventSlots );

// Stack events
$frameSlots = array();
$frameMonitorIds = array_keys($monFrameSlots);
for ( $i = 0; $i < $chart['graph']['width']; $i++ ) {
  foreach ( $frameMonitorIds as $frameMonitorId ) {
    unset( $currFrameSlots );
    $currFrameSlots = &$monFrameSlots[$frameMonitorId];
    if ( isset($currFrameSlots[$i]) ) {
      if ( !isset($frameSlots[$i]) ) {
        $frameSlots[$i] = array();
        $frameSlots[$i][] = &$currFrameSlots[$i];
      } else {
        $slotCount = count($frameSlots[$i]);
        for ( $j = 0; $j < $slotCount; $j++ ) {
          if ( $currFrameSlots[$i]['value'] > $frameSlots[$i][$j]['value'] ) {
            for ( $k = $slotCount; $k > $j; $k-- ) {
              $frameSlots[$i][$k] = $frameSlots[$i][$k-1];
            }
            $frameSlots[$i][$j] = &$currFrameSlots[$i];
            break 2;
          }
        }
        $frameSlots[$i][] = &$currFrameSlots[$i];
      }
    }
  } # end foreach MonitorId
}

//print_r( $monEventSlots );
//print_r( $monFrameSlots );
//print_r( $chart );

$graphHeight = $chart['graph']['height'];

if ( $mode == 'overlay' ) {
  $minEventBarHeight = 10;
  $maxEventBarHeight = 40;

  if ( count($monitorIds) ) {
    $chart['graph']['eventBarHeight'] = $minEventBarHeight;
    while ( ($chart['graph']['eventsHeight'] = (($chart['graph']['eventBarHeight'] * count($monitorIds)) + (count($monitorIds)-1))) < $maxEventBarHeight ) {
      $chart['graph']['eventBarHeight']++;
    }
  } else {
    $chart['graph']['eventBarHeight'] = $maxEventBarHeight;
    $chart['graph']['eventsHeight'] = $maxEventBarHeight;
  }
  $chart['graph']['activityHeight'] = ($graphHeight - $chart['graph']['eventsHeight']);
  $chart['data']['y']['density'] = $chart['data']['y']['range']/$chart['graph']['activityHeight'];

  $chart['eventBars'] = array();
  $top = $chart['graph']['activityHeight'];
  foreach ( array_keys($monitorIds) as $monitorId ) {
    $chart['eventBars'][$monitorId] = array( 'top' => $top );
    $top += $chart['graph']['eventBarHeight']+1;
  }
} else if ( $mode == 'split' ) {
  $minActivityBarHeight = 30;
  $minEventBarHeight = 10;
  $maxEventBarHeight = 40;

  if ( count($monitorIds) ) {
    $chart['graph']['eventBarHeight'] = $minEventBarHeight;
    $chart['graph']['activityBarHeight'] = $minActivityBarHeight;
    while ( ((($chart['graph']['eventBarHeight']+$chart['graph']['activityBarHeight']) * count($monitorIds)) + ((2*count($monitorIds))-1)) < $graphHeight ) {
      $chart['graph']['activityBarHeight']++;
      if ( $chart['graph']['eventBarHeight'] < $maxEventBarHeight ) {
        $chart['graph']['eventBarHeight']++;
      }
    }
  } else {
    $chart['graph']['eventBarHeight'] = $maxEventBarHeight;
    $chart['graph']['activityBarHeight'] = $graphHeight - $chart['graph']['eventBarHeight'];
  }
  $chart['data']['y']['density'] = $chart['data']['y']['range']/$chart['graph']['activityBarHeight'];

  $chart['activityBars'] = array();
  $chart['eventBars'] = array();
  $top = 0;
  $barCount = 1;
  foreach ( array_keys($monitorIds) as $monitorId ) {
    $chart['eventBars'][$monitorId] = array( 'top' => $top );
    $chart['eventBars'][$monitorId] = array( 'top' => $top+$chart['graph']['activityBarHeight']+1 );
    $top +=  $chart['graph']['activityBarHeight']+1+$chart['graph']['eventBarHeight']+1;
  }
}

preg_match( '/^(\d+)-(\d+)-(\d+) (\d+):(\d+)/', $minTime, $startMatches );
preg_match( '/^(\d+)-(\d+)-(\d+) (\d+):(\d+)/', $maxTime, $endMatches );

if ( $startMatches[1] != $endMatches[1] ) {
  // Different years
  $title = strftime( STRF_TL_AXIS_RANGE_YEAR1, $chart['data']['x']['lo'] )." - ".strftime( STRF_TL_AXIS_RANGE_YEAR2, $chart['data']['x']['hi'] );
} elseif ( $startMatches[2] != $endMatches[2] ) {
  // Different months
  $title = strftime( STRF_TL_AXIS_RANGE_MONTH1, $chart['data']['x']['lo'] )." - ".strftime( STRF_TL_AXIS_RANGE_MONTH2, $chart['data']['x']['hi'] );
} elseif ( $startMatches[3] != $endMatches[3] ) {
  // Different dates
  $title = strftime( STRF_TL_AXIS_RANGE_DAY1, $chart['data']['x']['lo'] )." - ".strftime( STRF_TL_AXIS_RANGE_DAY2, $chart['data']['x']['hi'] );
} else {
  // Different times
  $title = strftime( STRF_TL_AXIS_RANGE_TIME1, $chart['data']['x']['lo'] )." - ".strftime( STRF_TL_AXIS_RANGE_TIME2, $chart['data']['x']['hi'] );
}

function drawXGrid( $chart, $scale, $labelClass, $tickClass, $gridClass, $zoomClass=false ) {
  $html = '';
  ob_start();
  $labelCount = 0;
  $lastTick = 0;
  unset( $lastLabel );
  $labelCheck = isset($scale['labelCheck'])?$scale['labelCheck']:$scale['label'];
?>
          <div id="xScale">
<?php
  for ( $i = 0; $i < $chart['graph']['width']; $i++ ) {
    $x = $i - 1;
    $timeOffset = (int)($chart['data']['x']['lo'] + ($i * $chart['data']['x']['density']));
    if ( $scale['align'] > 1 ) {
      $label = (int)(strftime( $labelCheck, $timeOffset )/$scale['align']);
    } else {
      $label = strftime( $labelCheck, $timeOffset );
    }
    if ( !isset($lastLabel) || ($lastLabel != $label) ) {
      $labelCount++;
    }
    if ( $labelCount >= $scale['divisor'] ) {
      $labelCount = 0;
      if ( isset($lastLabel) ) {
        if ( $labelClass ) {
?>
            <div class="<?php echo $labelClass ?>" style="left: <?php echo $x-25 ?>px;"><?php echo strftime( $scale['label'], $timeOffset ); ?></div>
<?php
        }
        if ( $tickClass ) {
?>
            <div class="<?php echo $tickClass ?>" style="left: <?php echo $x ?>px;"></div>
<?php
        }
        if ( $gridClass ) {
?>
            <div class="<?php echo $gridClass ?>" style="left: <?php echo $x ?>px;"></div>
<?php
        }
        if ( $scale['name'] != 'second' && $zoomClass ) {
          $zoomMinTime = strftime( STRF_FMT_DATETIME_DB, (int)($chart['data']['x']['lo'] + ($lastTick * $chart['data']['x']['density'])) );
          $zoomMaxTime = strftime( STRF_FMT_DATETIME_DB, (int)($chart['data']['x']['lo'] + ($i * $chart['data']['x']['density'])) );
?>
            <div class="<?php echo $zoomClass ?>" style="left: <?php echo $lastTick-1 ?>px; width: <?php echo $i-$lastTick ?>px;" title="<?php echo translate('ZoomIn') ?>" onclick="tlZoomBounds( '<?php echo $zoomMinTime ?>', '<?php echo $zoomMaxTime ?>' )"></div>
<?php
        }
        $lastTick = $i;
      } # end if $lastLabel
    }
    $lastLabel = $label;
  } # end foreach width segment

  if ( $zoomClass ) {
    $zoomMinTime = strftime( STRF_FMT_DATETIME_DB, (int)($chart['data']['x']['lo'] + ($lastTick * $chart['data']['x']['density'])) );
    $zoomMaxTime = strftime( STRF_FMT_DATETIME_DB, (int)($chart['data']['x']['lo'] + ($i * $chart['data']['x']['density'])) );
?>
            <div class="<?php echo $zoomClass ?>" style="left: <?php echo $lastTick-1 ?>px; width: <?php echo $i-$lastTick ?>px;" title="<?php echo translate('ZoomIn') ?>" onclick="tlZoomBounds( '<?php echo $zoomMinTime ?>', '<?php echo $zoomMaxTime ?>' )"></div>
<?php
  }
?>
          </div>
<?php
  return( ob_get_clean() );
} # end function drawXGrid

function drawYGrid( $chart, $scale, $labelClass, $tickClass, $gridClass ) {
  ob_start();
?>
  <div id="yScale">
<?php
  for ( $i = 0; $i < $scale['lines']; $i++ ) {
    $label = (int)($i * $scale['divisor']);
    $y = $chart['graph']['eventsHeight']+(int)(($i * $scale['divisor'])/$chart['data']['y']['density'])-1;
    if ( $labelClass ) {
?>
       <div class="<?php echo $labelClass ?>" style="top: <?php echo $chart['graph']['height']-($y+8) ?>px;"><?php echo $label ?></div>
<?php
    }
    if ( $tickClass ) {
?>
       <div class="<?php echo $tickClass ?>" style="top: <?php echo $chart['graph']['height']-($y+2) ?>px;"></div>
<?php
    }
    if ( $gridClass ) {
?>
       <div class="<?php echo $gridClass ?>" style="top: <?php echo $chart['graph']['height']-($y+2) ?>px;<?php echo $i <= 0?' border-top: solid 1px black;':'' ?>"></div>
<?php
    }
  } # end foreach line segment
?>
  </div>
<?php
  return( ob_get_clean() );
} # end function drawYGrid

function getSlotPreviewEventBehaviour( $slot ) {
  return( "previewEvent( '".$slot['event']['Id']."', '".getSlotFrame( $slot )."' )" );
}

function getSlotShowEventBehaviour( $slot ) {
  global $monitors;

  $monitor = &$monitors[$slot['event']['MonitorId']];

  return( "showEvent( '".$slot['event']['Id']."', '".getSlotFrame( $slot )."', '".reScale( $monitor['Width'], $monitor['DefaultScale'], ZM_WEB_DEFAULT_SCALE )."', '".reScale( $monitor['Height'], $monitor['DefaultScale'], ZM_WEB_DEFAULT_SCALE )."' )" );
}

$focusWindow = true;

xhtmlHeaders(__FILE__, translate('Timeline') );
?>
<body>
  <div id="page">
    <div id="header">
      <div id="headerButtons">
        <?php echo makePopupLink( '?view=events&amp;page=1'.htmlspecialchars($filterQuery), 'zmEvents', 'events', translate('List'), canView( 'Events' ) ) ?>
        <a href="#" onclick="closeWindow();"><?php echo translate('Close') ?></a>
      </div>
      <h2><?php echo translate('Timeline') ?></h2>
    </div>
    <div id="content" class="chartSize">
      <div id="topPanel" class="graphWidth">
        <div id="imagePanel">
          <div id="image" class="imageHeight">
		        <img id="imageSrc" class="imageWidth" src="graphics/transparent.png" alt="<?php echo translate('ViewEvent') ?>" title="<?php echo translate('ViewEvent') ?>"/>
<?php
//due to chrome bug, has to enable https://code.google.com/p/chromium/issues/detail?id=472300
//crossorigin has to be added below to make caption work in chrome
?>
<!--
			<video id="preview" width="100%" controls crossorigin="anonymous">
				<source src="<?php echo getEventDefaultVideoPath($event); ?>" type="video/mp4">
Your browser does not support the video tag.
			</video>
o-->

          </div>
        </div>
        <div id="dataPanel">
          <div id="textPanel">
            <div id="instruction">
              <p><?php echo translate('TimelineTip1') ?></p>
              <p><?php echo translate('TimelineTip2') ?></p>
              <p><?php echo translate('TimelineTip3') ?></p>
              <p><?php echo translate('TimelineTip4') ?></p>
              </div>
            <div id="eventData">
            </div>
          </div>
          <div id="navPanel">
            <input type="button" title="<?php echo translate('PanLeft') ?>" value="&lt;&lt;" onclick="tlPan( '<?php echo $minTime ?>', '<?php echo $range ?>' )"/>
            <input type="button" title="<?php echo translate('ZoomOut') ?>" value="&ndash;" onclick="tlZoomRange( '<?php echo $midTime ?>', '<?php echo (int)($range*$majXScale['zoomout']) ?>' )"/>
            <input type="button" title="<?php echo translate('PanRight') ?>" value="&gt;&gt;" onclick="tlPan( '<?php echo $maxTime ?>', '<?php echo $range ?>' )"/>
          </div>
        </div>
      </div>
      <div id="chartPanel">
        <div id="chart" class="graphSize">
<?php
if ( $mode == 'overlay' ) {
  echo drawYGrid( $chart, $majYScale, 'majLabelY', 'majTickY', 'majGridY graphWidth' );
}
echo drawXGrid( $chart, $majXScale, 'majLabelX', 'majTickX', 'majGridX graphHeight', 'zoom graphHeight' );

if ( $mode == 'overlay' ) {
?>
          <div id="activity" class="activitySize">
<?php
    foreach ( $frameSlots as $index=>$slots ) {
      foreach ( $slots as $slot ) {
        $slotHeight = (int)($slot['value']/$chart['data']['y']['density']);

        if ( $slotHeight <= 0 )
          continue;

        if ( $mouseover ) {
          $behaviours = array(
              'onclick="'.getSlotShowEventBehaviour( $slot ).'"',
              'onmouseover="'.getSlotPreviewEventBehaviour( $slot ).'"'
              );
        } else {
          $behaviours = array(
              'onclick="'.getSlotPreviewEventBehaviour( $slot ).'"'
              );
        }
?>
            <div class="activity monitorColour<?php echo $slot['event']['MonitorId'] ?>" style="left: <?php echo $index ?>px; height: <?php echo $slotHeight ?>px;" <?php echo join( " ", $behaviours ) ?>></div>
<?php
      }
    }
?>
          </div>
<?php
} elseif ( $mode == 'split' ) {
  foreach( array_keys($monFrameSlots) as $monitorId ) {
?>
        <div id="activity<?php echo $monitorId ?>">
<?php
    unset( $currFrameSlots );
    $currFrameSlots = &$monFrameSlots[$monitorId];
    foreach ( $currFrameSlots as $index=>$slot ) {
      $slotHeight = (int)($slot['value']/$chart['data']['y']['density']);

      if ( $slotHeight <= 0 )
        continue;

      if ( $mouseover ) {
        $behaviours = array(
          'onclick="'.getSlotShowEventBehaviour( $slot ).'"',
          'onmouseover="'.getSlotPreviewEventBehaviour( $slot ).'"'
        );
      } else {
        $behaviours = array(
          'onclick="'.getSlotPreviewEventBehaviour( $slot ).'"'
        );
      }
?>
        <div class="activity activity<?php echo $slot['event']['MonitorId'] ?>" style="left: <?php echo $index ?>px; height: <?php echo $slotHeight ?>px;" <?php echo join( " ", $behaviours ) ?>></div>
<?php
    } # end foreach $currFrameSlots
?>
        </div>
<?php
  } # end foreach $MonitorId
}
foreach( array_keys($monEventSlots) as $monitorId ) {
?>
          <div id="events<?php echo $monitorId ?>" class="events eventsSize eventsPos<?php echo $monitorId ?>">
<?php
  unset( $currEventSlots );
  $currEventSlots = &$monEventSlots[$monitorId];
  $monitorMouseover = $mouseover;
  if ($monitors[$monitorId]['SaveJPEGs'] == 2) {
    $monitorMouseover = false;
  }
  for ( $i = 0; $i < $chart['graph']['width']; $i++ ) {
    if ( isset($currEventSlots[$i]) ) {
      unset( $slot );
      $slot = &$currEventSlots[$i];

      if ( $monitorMouseover ) {
        $behaviours = array(
            'onclick="'.getSlotShowEventBehaviour( $slot ).'"',
            'onmouseover="'.getSlotPreviewEventBehaviour( $slot ).'"'
        );
      } else {
        $behaviours = array(
            'onclick="'.getSlotPreviewEventBehaviour( $slot ).'"'
        );
      }
?>
            <div class="event eventsHeight monitorColour<?php echo $monitorId ?>" style="left: <?php echo $i ?>px; width: <?php echo $slot['width'] ?>px;" <?php echo join( " ", $behaviours ) ?>></div>
<?php
    } # end if isset($currEventSlots[$i])
  } # end foreach width segment
?>
          </div>
<?php
}
?>
        </div>
      </div>
      <div id="chartLabels" class="graphWidth">
        <div id="key">
<?php
foreach( array_keys($monEventSlots) as $monitorId ) {
?>
          <span class="keyEntry"><?php echo $monitors[$monitorId]['Name'] ?>
            <img id="keyBox<?php echo $monitorId ?>" class="keyBox monitorColour<?php echo $monitorId ?>" src="graphics/transparent.png" alt="<?php echo $monitors[$monitorId]['Name'] ?>"/>
          </span>
<?php
}
?>
        </div>
        <div id="range"><?php echo $title ?></div>
      </div>
    </div>
  </div>
  <script src="//cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.6/moment.min.js"></script>
</body>
</html>