<?php

/**
 * statdisplay plugin graph helper component
 *
 * @author Andreas Gohr <gohr@cosmocode.de>
 * @license  GPL 2 (http://www.gnu.org/licenses/gpl.html)
 */
class helper_plugin_statdisplay_graph extends DokuWiki_Plugin
{
    /** @var helper_plugin_statdisplay_log */
    private $log = null;

    /**
     * Outputs a Graph image
     *
     * @param string $command
     * @param string $from
     * @param string $to
     * @return void
     */
    public function sendgraph($command, $from = '', $to = '')
    {
        require dirname(__FILE__) . '/../pchart/pData.php';
        require dirname(__FILE__) . '/../pchart/pChart.php';
        require dirname(__FILE__) . '/../pchart/GDCanvas.php';
        require dirname(__FILE__) . '/../pchart/PieChart.php';

        $this->log = plugin_load('helper', 'statdisplay_log');

        header('Content-Type: image/png');
        switch ($command) {
            case 'all':
                $this->summary();
                break;
            case 'month by day':
                $this->monthby('day', $from);
                break;
            case 'month by hour':
                $this->monthby('hour', $from);
                break;
            case 'traffic by day':
                $this->trafficby('day', $from);
                break;
            case 'traffic by hour':
                $this->trafficby('hour', $from);
                break;
            case 'traffic by user':
                $this->userdownloads($from);
                break;
            default:
                $this->nograph('No such graph: ' . $command);
                break;
        }
    }

    /**
     * Show all the access data
     *
     * @param string $from
     * @param string $to
     * @return void
     */
    private function summary($from = '', $to = '')
    {
        $times = array();
        $hits = array();
        $pages = array();
        $media = array();
        $visitors = array();

        foreach ($this->log->logdata as $month => $data) {
            if ($month[0] == '_') continue;
            if ($from && $month < $from) continue;
            if ($to && $month > $to) break;

            $times[] = $month;
            $pages[] = $data['page']['all']['count'] ?? 0;
            $media[] = $data['media']['all']['count'] ?? 0;
            $hits[] = $data['hits']['all']['count'] ?? 0;
            $visitors[] = $data['hits']['all']['visitor'] ?? 0;
        }

        $title = $this->getLang('t_summary');

        $this->accessgraph(
            $title,
            $times,
            array(
                $this->getLang('hits'),
                $this->getLang('pages'),
                $this->getLang('media'),
                $this->getLang('visitors'),
            ),
            array($hits, $pages, $media, $visitors)
        );
    }

    /**
     * Show month access by day or hour
     *
     * @param string $by either day or hour
     * @param string $date
     */
    private function monthby($by, $date = '')
    {
        if (!$date) $date = date('Y-m');
        $data = $this->log->logdata[$date];

        $times = array();
        $hits = array();
        $pages = array();
        $media = array();
        $visitors = array();

        $keys = array_keys((array)$data['hits'][$by]);
        sort($keys);
        foreach ($keys as $idx) {
            $times[] = $idx;
            $pages[] = $data['page'][$by][$idx]['count'];
            $media[] = $data['media'][$by][$idx]['count'];
            $hits[] = $data['hits'][$by][$idx]['count'];
            $visitors[] = $data['hits'][$by][$idx]['visitor'];
        }

        $title = sprintf($this->getLang('t_' . $by), $date);

        $this->accessgraph(
            $title,
            $times,
            array(
                $this->getLang('hits'),
                $this->getLang('pages'),
                $this->getLang('media'),
                $this->getLang('visitors'),
            ),
            array($hits, $pages, $media, $visitors)
        );
    }

    /**
     * Show month traffic by day or hour
     *
     * @param string $by either day or hour
     * @param string $date
     */
    private function trafficby($by, $date = '')
    {
        if (!$date) $date = date('Y-m');
        $data = $this->log->logdata[$date];

        $times = array();
        $hits = array();
        $pages = array();
        $media = array();

        foreach (array_keys((array)$data['hits'][$by]) as $idx) {
            $times[] = $idx;
            $pages[] = $data['page'][$by][$idx]['bytes'] / 1024;
            $media[] = $data['media'][$by][$idx]['bytes'] / 1024;
            $hits[] = $data['hits'][$by][$idx]['bytes'] / 1024;
        }

        $title = 'Traffic';

        $this->accessgraph(
            $title,
            $times,
            array(
                $this->getLang('all'),
                $this->getLang('pages'),
                $this->getLang('media'),
            ),
            array($hits, $pages, $media)
        );
    }

    /**
     * @param string $date month to display
     */
    private function userdownloads($date)
    {
        $usertraffic = $this->log->usertraffic($date);
        if (!$usertraffic) $this->nograph($this->getLang('t_usertraffic') . ': no data');

        $usertraffic = array_map(function ($in) {
            return $in / 1024 / 1024;
        }, $usertraffic);

        // get work day average
        if (count($usertraffic)) {
            $avg = $this->log->avg($usertraffic);
            // $avg = $avg / 7 *5; //work day average
        } else {
            $avg = 0;
        }
        arsort($usertraffic); // highest first

        // limit number of users shown
        $maxusers = 10;
        if (count($usertraffic) > $maxusers + 1) {
            $others = array_slice($usertraffic, $maxusers);
            $usertraffic = array_slice($usertraffic, 0, $maxusers);

            $other = 0;
            foreach ($others as $user => $traffic) {
                $other += $traffic;
            }

            $usertraffic[sprintf($this->getLang('others'), count($others))] = $other;
        }

        // prepare the graph datasets
        $DataSet = new pData();
        $DataSet->addPoints(array_values($usertraffic), "traffic");

        // setup axis
        $DataSet->AddPoints(array_keys($usertraffic), 'names');
        $DataSet->AddAllSeries();
        $DataSet->SetAbscissaLabelSeries('names');
        $DataSet->removeSeries('names');
        $DataSet->removeSeriesName('names');

        // create the bar graph
        $Canvas = new GDCanvas(600, 300, false);
        $Chart = new pChart(600, 300, $Canvas);

        $Chart->setFontProperties(dirname(__FILE__) . '/../pchart/Fonts/DroidSans.ttf', 8);
        $Chart->setGraphArea(50, 40, 600, 200);
        $Chart->drawScale(
            $DataSet, new ScaleStyle(SCALE_NORMAL, new Color(127)),
            45, 1, true
        );

        $Chart->drawBarGraph($DataSet->GetData(), $DataSet->GetDataDescription());
        //$Chart->drawLegend(500, 40, $DataSet->GetDataDescription(), new Color(250));

        $Chart->drawTreshold($avg, new Color(128, 0, 0));

        $Chart->setFontProperties(dirname(__FILE__) . '/../pchart/Fonts/DroidSans.ttf', 12);
        $Chart->drawTitle(10, 10, $this->getLang('t_usertraffic') . ' (MB)', new Color(0), 590, 30);

        $Chart->Render(null);

    }

    /**
     * Draws a line or bargraph depending on the number of data points
     *
     * @param string $title the graph's title
     * @param array $axis the axis points
     * @param array $labels the labels for the datasets
     * @param array $datasets any number of data arrays
     */
    private function accessgraph($title, $axis, $labels, $datasets)
    {
        if (!count($axis)) {
            $this->nograph($title . ': no data');
            return;
        }

        // add the data and labels
        $DataSet = new pData();
        foreach ($datasets as $num => $set) {
            $DataSet->AddPoints($set, "series$num");
            $DataSet->SetSeriesName($labels[$num], "series$num");
        }

        // setup axis
        $DataSet->AddPoints($axis, 'times');
        $DataSet->AddAllSeries();
        $DataSet->SetAbscissaLabelSeries('times');
        $DataSet->removeSeries('times');
        $DataSet->removeSeriesName('times');

        $Canvas = new GDCanvas(600, 300, false);
        $Chart = new pChart(600, 300, $Canvas);
        $usebargraph = (count($axis) < 10);

        $Chart->setFontProperties(dirname(__FILE__) . '/../pchart/Fonts/DroidSans.ttf', 8);
        $Chart->setGraphArea(50, 40, 500, 200);
        $Chart->drawScale(
            $DataSet, new ScaleStyle(SCALE_NORMAL, new Color(127)),
            45, 1, $usebargraph
        );

        if ($usebargraph) {
            $Chart->drawBarGraph($DataSet->GetData(), $DataSet->GetDataDescription());
        } else {
            $Chart->drawLineGraph($DataSet->GetData(), $DataSet->GetDataDescription());
        }
        $Chart->drawLegend(500, 40, $DataSet->GetDataDescription(), new Color(250));

        $Chart->setFontProperties(dirname(__FILE__) . '/../pchart/Fonts/DroidSans.ttf', 12);
        $Chart->drawTitle(10, 10, $title, new Color(0), 590, 30);

        $Chart->Render(null);
    }

    /**
     * Just creates a message
     *
     * @param $title
     */
    private function nograph($title)
    {
        $Canvas = new GDCanvas(300, 40, false);
        $Chart = new pChart(300, 40, $Canvas);
        $Chart->setFontProperties(dirname(__FILE__) . '/../pchart/Fonts/DroidSans.ttf', 10);
        $Chart->drawTitle(0, 0, $title, new Color(128, 0, 0), 300, 40);
        $Chart->Render(null);
        exit;
    }
}