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<?php
namespace WPForms\Admin\Helpers;
use DateInterval;
use DatePeriod;
use DateTimeImmutable;
/**
* Chart dataset processing helper methods.
*
* @since 1.8.2
*/
class Chart {
/**
* Default date format.
*
* @since 1.8.2
*/
const DATE_FORMAT = 'Y-m-d';
/**
* Default date-time format.
*
* @since 1.8.2
*/
const DATETIME_FORMAT = 'Y-m-d H:i:s';
/**
* Processes the provided dataset to make sure the formatting needed for the "Chart.js" instance is provided.
*
* @since 1.8.2
*
* @param array $query Dataset retrieved from the database.
* @param DateTimeImmutable $start_date Start date for the timespan.
* @param DateTimeImmutable $end_date End date for the timespan.
*
* @return array
*/
public static function process_chart_dataset_data( $query, $start_date, $end_date ) {
// Bail early if the given query contains no records to iterate.
if ( ! is_array( $query ) || empty( $query ) ) {
return [ 0, [] ];
}
$dataset = [];
$timezone = wp_timezone(); // Retrieve the timezone object for the site.
$mysql_timezone = timezone_open( 'UTC' ); // In the database, all datetime are stored in UTC.
foreach ( $query as $row ) {
$row_day = isset( $row['day'] ) ? sanitize_text_field( $row['day'] ) : '';
$row_count = isset( $row['count'] ) ? abs( (float) $row['count'] ) : 0;
// Skip the rest of the current iteration if the date (day) is unavailable.
if ( empty( $row_day ) ) {
continue;
}
// Since we won’t need the initial datetime instances after the query,
// there is no need to create immutable date objects.
$row_datetime = date_create_from_format( self::DATETIME_FORMAT, $row_day, $mysql_timezone );
// Skip the rest of the current iteration if the date creation function fails.
if ( ! $row_datetime ) {
continue;
}
$row_datetime->setTimezone( $timezone );
$row_date_formatted = $row_datetime->format( self::DATE_FORMAT );
// We must take into account entries submitted at different hours of the day,
// because it is possible that more than one entry could be submitted on a given day.
if ( ! isset( $dataset[ $row_date_formatted ] ) ) {
$dataset[ $row_date_formatted ] = $row_count;
continue;
}
$dataset_count = $dataset[ $row_date_formatted ];
$dataset[ $row_date_formatted ] = $dataset_count + $row_count;
}
return self::format_chart_dataset_data( $dataset, $start_date, $end_date );
}
/**
* Format given forms dataset to ensure correct data structure is parsed for serving the "chart.js" instance.
* i.e., [ '2023-02-11' => [ 'day' => '2023-02-11', 'count' => 12 ] ].
*
* @since 1.8.2
*
* @param array $dataset Dataset for the chart.
* @param DateTimeImmutable $start_date Start date for the timespan.
* @param DateTimeImmutable $end_date End date for the timespan.
*
* @return array
*/
private static function format_chart_dataset_data( $dataset, $start_date, $end_date ) {
// In the event that there is no dataset to process, leave early.
if ( empty( $dataset ) ) {
return [ 0, [] ];
}
$interval = new DateInterval( 'P1D' ); // Variable that store the date interval of period 1 day.
$period = new DatePeriod( $start_date, $interval, $end_date ); // Used for iteration between start and end date period.
$data = []; // Placeholder for the actual chart dataset data.
$total_entries = 0;
$has_non_zero_count = false;
// Use loop to store date into array.
foreach ( $period as $date ) {
$date_formatted = $date->format( self::DATE_FORMAT );
$count = isset( $dataset[ $date_formatted ] ) ? (float) $dataset[ $date_formatted ] : 0;
$total_entries += $count;
$data[ $date_formatted ] = [
'day' => $date_formatted,
'count' => $count,
];
// This check helps determine whether there is at least one non-zero count value in the dataset being processed.
// It's used to optimize the function's behavior and to decide whether to include certain data in the returned result.
if ( $count > 0 && ! $has_non_zero_count ) {
$has_non_zero_count = true;
}
}
return [
$total_entries,
$has_non_zero_count ? $data : [], // We will return an empty array to indicate that there is no data to display.
];
}
}