<?php
/*
This plugin uses the javascript library https://github.com/gionkunz/chartist-js
*/
class pluginSimpleStats extends Plugin {

private $loadOnController = array(
	'dashboard'
);

public function init()
{
	global $L;

	// Fields and default values for the database of this plugin
	$this->dbFields = array(
		'label'=>$L->g('Visits'),
		'numberOfDays'=>7,
		'excludeAdmins'=>false,
		'showContentStats'=>false
	);
}

public function form()
{
	global $L;

	$html  = '<div class="alert alert-primary" role="alert">';
	$html .= $this->description();
	$html .= '</div>';

	$html .= '<div>';
	$html .= '<label>'.$L->get('Label').'</label>';
	$html .= '<input id="jslabel" name="label" type="text" value="'.$this->getValue('label').'">';
	$html .= '<span class="tip">'.$L->get('This title is almost always used in the sidebar of the site').'</span>';
	$html .= '</div>';

	$html .= '<div>';
	$html .= '<label>'.$L->get('Show Content Stats').'</label>';
	$html .= '<select name="showContentStats">';
	$html .= '<option value="true" '.($this->getValue('showContentStats')===true?'selected':'').'>'.$L->get('Enabled').'</option>';
	$html .= '<option value="false" '.($this->getValue('showContentStats')===false?'selected':'').'>'.$L->get('Disabled').'</option>';
	$html .= '</select>';
	$html .= '</div>';

	if (defined('BLUDIT_PRO')) {
		$html .= '<div>';
		$html .= '<label>'.$L->get('Exclude administrators users').'</label>';
		$html .= '<select name="excludeAdmins">';
		$html .= '<option value="true" '.($this->getValue('excludeAdmins')===true?'selected':'').'>'.$L->get('Enabled').'</option>';
		$html .= '<option value="false" '.($this->getValue('excludeAdmins')===false?'selected':'').'>'.$L->get('Disabled').'</option>';
		$html .= '</select>';
		$html .= '</div>';
	}

	return $html;
}

public function adminHead()
{
	if (!in_array($GLOBALS['ADMIN_CONTROLLER'], $this->loadOnController)) {
		return false;
	}

	// Include plugin's CSS files
	$html  = $this->includeCSS('chartist.min.css');
	$html .= $this->includeCSS('style.css');

	// Include plugin's Javascript files
	$html .= $this->includeJS('chartist.min.js');

	return $html;
}

public function dashboard()
{
	global $L;
	$label = $this->getValue('label');
	$currentDate = Date::current('Y-m-d');
	$visitsToday = $this->visits($currentDate);
	$uniqueVisitors = $this->uniqueVisitors($currentDate);

$html = <<<EOF
<div class="simple-stats-plugin">
<div class="my-4 pt-4 border-top">
<div class="ct-chart ct-perfect-fourth"></div>
<p class="legends visits-today">{$L->g('Visits today')}: $visitsToday</p>
<p class="legends unique-today">{$L->g('Unique visitors today')}: $uniqueVisitors</p>
</div>
</div>
EOF;

	$numberOfDays = $this->getValue('numberOfDays');
	$numberOfDays = $numberOfDays - 1;
	for ($i=$numberOfDays; $i >= 0 ; $i--) {
		$dateWithOffset = Date::currentOffset('Y-m-d', '-'.$i.' day');
		$visits[$i] = $this->visits($dateWithOffset);
		$unique[$i] = $this->uniqueVisitors($dateWithOffset);
		$days[$i] = Date::format($dateWithOffset, 'Y-m-d', 'D');
	}

	$labels = "'" . implode("','", $days) . "'";
	$seriesVisits = implode(',', $visits);
	$seriesUnique = implode(',', $unique);

$script = <<<EOF
<script>
var data = {
labels: [$labels],
series: [
[$seriesVisits],
[$seriesUnique]
]
};

var options = {
	height: 250,
	axisY: {
		onlyInteger: true,
	}
};

new Chartist.Line('.ct-chart', data, options);

</script>
EOF;

	/**
	 * Optional Content Stats Feature
	 */
	if ($this->getValue('showContentStats'))  {
		global $pages, $categories, $tags;

		$data['title'] = $L->get('Statistics');
		$data['tabTitleChart'] = $L->get('Chart');
		$data['tabTitleTable'] = $L->get('Table');
		$data['data'][$L->get('published')] 	= count($pages->getPublishedDB());
		$data['data'][$L->get('static')] 	= count($pages->getStaticDB());
		$data['data'][$L->get('drafts')]	= count($pages->getDraftDB());
		$data['data'][$L->get('scheduled')] 	= count($pages->getScheduledDB());
		$data['data'][$L->get('sticky')] 	= count($pages->getStickyDB());
		$data['data'][$L->get('categories')]	= count($categories->keys());
		$data['data'][$L->get('tags')] 		= count($tags->keys());
		$html .= $this->renderContentStatistics($data);
	}

	$this->deleteOldLogs();

	return $html.PHP_EOL.$script.PHP_EOL;
}

public function siteBodyEnd()
{
	$this->addVisitor();
}

// Keep only 7 days of logs
public function deleteOldLogs()
{
	$logs = Filesystem::listFiles($this->workspace(), '*', 'log', true);
	$remove = array_slice($logs, 7);

	foreach ($remove as $log) {
		Filesystem::rmfile($log);
	}
}

// Returns the amount of visits by date
public function visits($date)
{
	$file = $this->workspace().$date.'.log';
	$handle = @fopen($file, 'rb');
	if ($handle===false) {
		return 0;
	}

	// The amount of visits are the number of lines on the file
	$lines = 0;
	while (!feof($handle)) {
		$lines += substr_count(fread($handle, 8192), PHP_EOL);
	}
	@fclose($handle);
	return $lines;
}

// Returns the amount of unique visitors by date
public function uniqueVisitors($date)
{
	$file = $this->workspace().$date.'.log';
	$lines = @file($file);
	if (empty($lines)) {
		return 0;
	}

	$tmp = array();
	foreach ($lines as $line) {
		$data = json_decode($line);
		$hashIP = $data[0];
		$tmp[$hashIP] = true;
	}
	return count($tmp);
}

// Add a line to the current log
// The line is a json array with the hash IP of the visitor and the time
public function addVisitor()
{
	if (Cookie::get('BLUDIT-KEY') && defined('BLUDIT_PRO') && $this->getValue('excludeAdmins')) {
		return false;
	}
            $currentTime = Date::current('Y-m-d H:i:s');
	$ip = TCP::getIP();
	$hashIP = md5($ip);

	$line = json_encode(array($hashIP, $currentTime));
	$currentDate = Date::current('Y-m-d');
	$logFile = $this->workspace().$currentDate.'.log';

	return file_put_contents($logFile, $line.PHP_EOL, FILE_APPEND | LOCK_EX)!==false;
}

public function renderContentStatistics($data)
{
	global $L;
	$diskUsage = Filesystem::bytesToHumanFileSize(
		Filesystem::getSize(PATH_ROOT)
	);

	$html = '<div class="my-5 pt-4 border-top">';
	$html .= "<h4 class='pb-2'>{$data['title']}</h4>";
	$html .= '
	<nav>
	  <div class="nav nav-tabs" id="nav-tab" role="tablist">
	    <a class="nav-item nav-link active" id="nav-stats-chart-tab" data-toggle="tab" href="#nav-stats-chart" role="tab" aria-controls="nav-stats-chart" aria-selected="true">' . $data['tabTitleChart'] .'</a>
	    <a class="nav-item nav-link" id="nav-stats-table-tab" data-toggle="tab" href="#nav-stats-table" role="tab" aria-controls="nav-stats-table" aria-selected="false">' . $data['tabTitleTable'] .'</a>
	  </div>
	</nav>
	<div class="tab-content my-2" id="nav-tabContent">
	  <div class="tab-pane fade show active" id="nav-stats-chart" role="tabpanel" aria-labelledby="nav-stats-chart-tab">
	  	<div class="ct-chart-content pt-2"></div>
	  </div>
	  <div class="tab-pane fade" id="nav-stats-table" role="tabpanel" aria-labelledby="nav-stats-table-tab">
		<table class="table table-borderless table-sm table-striped mt-3">
		  <tbody>';

	$html .= "<tr><th>{$L->get('disk-usage')}</th><td>$diskUsage</td></tr>";
	foreach ($data['data'] as $th => $td) {
		$html .= "
			<tr>
				<th>$th</th>
				<td>$td</td>
			</tr>
		";
	}

	$html .= '
		  </tbody>
		</table>
	  </div>
	</div>

	</div>

	<script>
	new Chartist.Bar(".ct-chart-content", {
	  labels: ' . json_encode(array_keys($data['data'])) . ',
	  series: ' . json_encode(array_values($data['data'])) . '
	}, {
	  distributeSeries: true
	});
	</script>';

	return $html;
}

}