TranslationStatsDataProvider.php

<?php
declare( strict_types = 1 );
 
namespace MediaWiki\Extension\Translate\Statistics;
 
use Language;
use MediaWiki\Config\ServiceOptions;
use MessageGroups;
use TranslateUtils;
use Wikimedia\ObjectFactory\ObjectFactory;
use const TS_MW;
 
class TranslationStatsDataProvider {
    public const CONSTRUCTOR_OPTIONS = [
        'TranslateStatsProviders'
    ];
 
    private $objectFactory;
    private $options;
 
    public function __construct( ServiceOptions $options, ObjectFactory $objectFactory ) {
        $this->options = $options;
        $this->objectFactory = $objectFactory;
    }
 
    private function getGraphSpecifications(): array {
        return array_filter( $this->options->get( 'TranslateStatsProviders' ) );
    }
 
    public function getGraphTypes(): array {
        return array_keys( $this->getGraphSpecifications() );
    }
 
    public function getGraphData( TranslationStatsGraphOptions $opts, Language $language ): array {
        $dbr = wfGetDB( DB_REPLICA );
 
        $so = $this->getStatsProvider( $opts->getValue( 'count' ), $opts );
 
        $fixedStart = $opts->getValue( 'start' ) !== '';
 
        $now = time();
        $period = 3600 * 24 * $opts->getValue( 'days' );
 
        if ( $fixedStart ) {
            $cutoff = (int)wfTimestamp( TS_UNIX, $opts->getValue( 'start' ) );
        } else {
            $cutoff = $now - $period;
        }
        $cutoff = self::roundTimestampToCutoff( $opts->getValue( 'scale' ), $cutoff, 'earlier' );
 
        $start = $cutoff;
 
        if ( $fixedStart ) {
            $end = self::roundTimestampToCutoff( $opts->getValue( 'scale' ), $start + $period, 'later' ) - 1;
        } else {
            $end = null;
        }
 
        $tables = [];
        $fields = [];
        $conds = [];
        $type = __METHOD__;
        $options = [];
        $joins = [];
 
        $so->preQuery( $tables, $fields, $conds, $type, $options, $joins, $start, $end );
        $res = $dbr->select( $tables, $fields, $conds, $type, $options, $joins );
        wfDebug( __METHOD__ . "-queryend\n" );
 
        // Start processing the data
        $dateFormat = $so->getDateFormat();
        $increment = self::getIncrement( $opts->getValue( 'scale' ) );
 
        $labels = $so->labels();
        $keys = array_keys( $labels );
        $values = array_pad( [], count( $labels ), 0 );
        $defaults = array_combine( $keys, $values );
 
        $data = [];
        // Allow 10 seconds in the future for processing time
        $lastValue = $end ?? $now + 10;
        while ( $cutoff <= $lastValue ) {
            $date = $language->sprintfDate( $dateFormat, wfTimestamp( TS_MW, $cutoff ) );
            $cutoff += $increment;
            $data[$date] = $defaults;
        }
        // Ensure $lastValue is within range, in case the loop above jumped over it
        $data[$language->sprintfDate( $dateFormat, wfTimestamp( TS_MW, $lastValue ) )] = $defaults;
 
        // Processing
        $labelToIndex = array_flip( $labels );
 
        foreach ( $res as $row ) {
            $indexLabels = $so->indexOf( $row );
            if ( $indexLabels === false ) {
                continue;
            }
 
            foreach ( $indexLabels as $i ) {
                if ( !isset( $labelToIndex[$i] ) ) {
                    continue;
                }
                $date = $language->sprintfDate( $dateFormat, $so->getTimestamp( $row ) );
                // Ignore values outside range
                if ( !isset( $data[$date] ) ) {
                    continue;
                }
 
                $data[$date][$labelToIndex[$i]]++;
            }
        }
 
        // Don't display dummy label
        if ( count( $labels ) === 1 && $labels[0] === 'all' ) {
            $labels = [];
        }
 
        foreach ( $labels as &$label ) {
            if ( strpos( $label, '@' ) === false ) {
                continue;
            }
            [ $groupId, $code ] = explode( '@', $label, 2 );
            if ( $code && $groupId ) {
                $code = TranslateUtils::getLanguageName( $code, $language->getCode() ) . " ($code)";
                $group = MessageGroups::getGroup( $groupId );
                $group = $group ? $group->getLabel() : $groupId;
                $label = "$group @ $code";
            } elseif ( $code ) {
                $label = TranslateUtils::getLanguageName( $code, $language->getCode() ) . " ($code)";
            } elseif ( $groupId ) {
                $group = MessageGroups::getGroup( $groupId );
                $label = $group ? $group->getLabel() : $groupId;
            }
        }
 
        // Indicator that the last value is not full
        if ( $end === null ) {
            // Warning: do not user array_splice, which does not preserve numerical keys
            $last = end( $data );
            $key = key( $data );
            unset( $data[$key] );
            $data[ "$key*" ] = $last;
        }
 
        return [ $labels, $data ];
    }
 
    private function getStatsProvider( string $type, TranslationStatsGraphOptions $opts ): TranslationStatsInterface {
        $specs = $this->getGraphSpecifications();
        return $this->objectFactory->createObject(
            $specs[$type],
            [
                'allowClassName' => true,
                'extraArgs' => [ $opts ],
            ]
        );
    }
 
    private static function roundTimestampToCutoff(
        string $scale, int $cutoff, string $direction = 'earlier'
    ): int {
        $dir = $direction === 'earlier' ? -1 : 1;
 
        /* Ensure that the first item in the graph has full data even
        * if it doesn't align with the given 'days' boundary */
        if ( $scale === 'hours' ) {
            $cutoff += self::roundingAddition( $cutoff, 3600, $dir );
        } elseif ( $scale === 'days' ) {
            $cutoff += self::roundingAddition( $cutoff, 86400, $dir );
        } elseif ( $scale === 'weeks' ) {
            /* Here we assume that week starts on monday, which does not
            * always hold true. Go Xwards day by day until we are on monday */
            while ( date( 'D', $cutoff ) !== 'Mon' ) {
                $cutoff += $dir * 86400;
            }
            // Round to nearest day
            $cutoff -= ( $cutoff % 86400 );
        } elseif ( $scale === 'months' ) {
            // Go Xwards/ day by day until we are on the first day of the month
            while ( date( 'j', $cutoff ) !== '1' ) {
                $cutoff += $dir * 86400;
            }
            // Round to nearest day
            $cutoff -= ( $cutoff % 86400 );
        } elseif ( $scale === 'years' ) {
            // Go Xwards/ day by day until we are on the first day of the year
            while ( date( 'z', $cutoff ) !== '0' ) {
                $cutoff += $dir * 86400;
            }
            // Round to nearest day
            $cutoff -= ( $cutoff % 86400 );
        }
 
        return $cutoff;
    }
 
    private static function roundingAddition( int $ts, int $amount, int $dir ): int {
        if ( $dir === -1 ) {
            return -1 * ( $ts % $amount );
        } else {
            return $amount - ( $ts % $amount );
        }
    }
 
    private static function getIncrement( string $scale ): int {
        $increment = 3600 * 24;
        if ( $scale === 'years' ) {
            $increment = 3600 * 24 * 350;
        } elseif ( $scale === 'months' ) {
            /* We use increment to fill up the values. Use number small enough
             * to ensure we hit each month */
            $increment = 3600 * 24 * 15;
        } elseif ( $scale === 'weeks' ) {
            $increment = 3600 * 24 * 7;
        } elseif ( $scale === 'hours' ) {
            $increment = 3600;
        }
 
        return $increment;
    }
}