<?php
/**
* Org Events widget which reportes the number of events created monthly by each local organizations
*/
class OrgEventsWidget
{
    public $title = 'Org Events';
    public $render = 'MultiLineChart';
    public $width = 8;
    public $height = 6;
    public $description = 'A graph to show the monthly number of events per organisation';
    public $cacheLifetime = 10;
    public $autoRefreshDelay = false;
    public $params = array(
        'blocklist_orgs' => 'A list of organisation names to filter out',
        'months' => 'Number of past months to consider for the graph',
        'logarithmic' => 'Visualize data on logarithmic scale'
    );

    public $placeholder =
'{
    "blocklist_orgs": ["Orgs to filter"],
    "months": "6",
    "logarithmic": "true"
}';

    /*
    * Target_month must be from 1 to 12
    * Target year must be 4 digits
    */
    private function org_events_count($user, $org, $target_month, $target_year)
    {
        $events_count = 0;

        $start_date = $target_year.'-'.$target_month.'-01';
        if($target_month == 12) {
            $end_date = ($target_year+1).'-01-01';
        } else {
            $end_date = $target_year.'-'.($target_month+1).'-01';
        }
        $conditions = array('Event.orgc_id' => $org['Organisation']['id'], 'Event.date >=' => $start_date, 'Event.date <' => $end_date);

        //This is required to enforce the ACL (not pull directly from the DB)
        $eventIds = $this->Event->fetchSimpleEventIds($user, array('conditions' => $conditions));

        if(!empty($eventIds)) {
            $params = array('Event.id' => $eventIds);
            $events = $this->Event->find('all', array('conditions' => array('AND' => $params)));
            foreach($events as $event) {
                $events_count+= 1;
            }
        }
        return $events_count;
    }

    private function filter_ghost_orgs(&$data, $orgs)
    {
        foreach ($data['data'] as &$item) {
            foreach(array_keys($orgs) as $org_name) {
                unset($item[$org_name]);
            }
        }
    }

    public function handler($user, $options = array())
    {
        $this->Log = ClassRegistry::init('Log');
        $this->Org = ClassRegistry::init('Organisation');
        $this->Event = ClassRegistry::init('Event');
        $orgs = $this->Org->find('all', array( 'conditions' => array('Organisation.local' => 1)));
        $current_month = date('n');
        $current_year = date('Y');
        $limit = 6; // months
        if(!empty($options['months'])) {
            $limit = (int) ($options['months']);
        }
        $offset = 0;
        $ghost_orgs = array(); // track orgs without any contribution
        // We start by putting all orgs_id in there:
        foreach($orgs as $org) {
            // We check for blocklisted orgs
            if(!empty($options['blocklist_orgs']) && in_array($org['Organisation']['name'], $options['blocklist_orgs'])) {
                unset($orgs[$offset]);
            } else {
                $ghost_orgs[$org['Organisation']['name']] = true;
            }
            $offset++;
        }
        $logarithmic = isset($options['logarithmic']) && ($options['logarithmic'] === "true" || $options['logarithmic'] === "1");
        $data = array();
        $data['data'] = array();
        for ($i=0; $i < $limit; $i++) {
            $target_month = $current_month - $i;
            $target_year = $current_year;
            if ($target_month < 1) {
                $target_month += 12;
                $target_year -= 1;
            }
            $item = array();
            $item['date'] = $target_year.'-'.$target_month.'-01';
            foreach($orgs as $org) {
                $count = $this->org_events_count($user, $org, $target_month, $target_year);
                if ($logarithmic) {
                    $item[$org['Organisation']['name']] = (int) round(log($count, 1.1));  // taking the logarithmic view
                } else {
                    $item[$org['Organisation']['name']] = $count;
                }
                // if a positive score is detected at least once it's enough to be
                // considered for the graph
                if ($count > 0) {
                    unset($ghost_orgs[$org['Organisation']['name']]);
                }
            }
            $data['data'][] = $item;
        }
        $this->filter_ghost_orgs($data, $ghost_orgs);
        return $data;
    }
}