/**
* Generate the json data to be plotted in the graph
* TODO: Ugly code, need to revise
*
* The data is an array of graph coordinates, which in our case is in this form
* ([time], [number of likes/comments])
*
* @param $period
* The period to calculate the most popular status (by month, e.g. 6 or 12 months)
*/
function generate_data($statuses, $period = null) {
$oldest_status = get_oldest($statuses);
$oldest_year = get_year($oldest_status['updated_time']); // year of the oldest status
$newest_status = get_newest($statuses);
$newest_year = get_year($newest_status['updated_time']); // year of the most recent status
// Currently the graph can only plot time period of 2, 3, 4, 6
// So make it 12 months if an invalid number is passed
if (($period == null) || ($period > 12) || ((12 % $period) != 0)) {
$period = 12;
}
$from = "01-01-$oldest_year";
$data = array();
for ($year = $oldest_year; $year <= $newest_year + 1; $year++) {
$to = "01-01-$year";
for ($month = 1 + $period; $month <= 12 + 1; $month += $period) {
if ($to != $from) {
$most_popular = get_most_popular($statuses, '', $from, $to);
if ($most_popular) {
$popularity = $most_popular['like_count'] + $most_popular['comment_count'];
}
else {
$popularity = 0;
}
// Notes: The Flot API can only accept time data as Javascript timestamp
// We need to pass a valid date string and generate timestamp at front end
$data['plot_data'][] = array(date('M j, Y', strtotime("$to")), $popularity);
$data['status_data'][] = array(
'status' => status_format_js($most_popular),
'from' => $from,
'to' => $to,
);
if ($year == $newest_year + 1) {
break;
}
}
$next = $month + 1;
$from = $to;
$to = "01-$month-$year";
}
}
return $data;
}
/**
* Display the oldest status
*/
function print_oldest($statuses) {
global $user;
$status = get_oldest($statuses);
echo "<h2>Oldest Retrievable Status</h2>";
print_status($status);
}