Entities.php

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<?php

namespace Elgg\Database;

use Doctrine\DBAL\Query\Expression\CompositeExpression;
use Elgg\Database\Clauses\AnnotationWhereClause;
use Elgg\Database\Clauses\EntityWhereClause;
use Elgg\Database\Clauses\MetadataWhereClause;
use Elgg\Database\Clauses\RelationshipWhereClause;
use Elgg\Exceptions\DomainException;
use Elgg\Exceptions\LogicException;

class Entities extends Repository {

    public function count() {
        $qb = Select::fromTable(EntityTable::TABLE_NAME, EntityTable::DEFAULT_JOIN_ALIAS);

        $count_expr = $this->options->distinct ? "DISTINCT {$qb->getTableAlias()}.guid" : '*';
        $qb->select("COUNT({$count_expr}) AS total");

        $qb = $this->buildQuery($qb);

        $result = _elgg_services()->db->getDataRow($qb);

        if (empty($result)) {
            return 0;
        }
        
        return (int) $result->total;
    }

    public function calculate($function, $property, $property_type = null) {
        if (!in_array(strtolower($function), QueryBuilder::CALCULATIONS)) {
            throw new DomainException("'{$function}' is not a valid numeric function");
        }

        if (!isset($property_type)) {
            if (in_array($property, \ElggEntity::PRIMARY_ATTR_NAMES)) {
                $property_type = 'attribute';
            } else {
                $property_type = 'metadata';
            }
        }

        $qb = Select::fromTable(EntityTable::TABLE_NAME, EntityTable::DEFAULT_JOIN_ALIAS);

        switch ($property_type) {
            case 'attribute':
                if (!in_array($property, \ElggEntity::PRIMARY_ATTR_NAMES)) {
                    throw new DomainException("'{$property}' is not a valid attribute");
                }

                $qb->addSelect("{$function}({$qb->getTableAlias()}.{$property}) AS calculation");
                break;

            case 'metadata':
                $alias = $qb->joinMetadataTable($qb->getTableAlias(), 'guid', $property, 'inner', MetadataTable::DEFAULT_JOIN_ALIAS);
                $qb->addSelect("{$function}({$alias}.value) AS calculation");
                break;

            case 'annotation':
                $alias = $qb->joinAnnotationTable($qb->getTableAlias(), 'guid', $property, 'inner', AnnotationsTable::DEFAULT_JOIN_ALIAS);
                $qb->addSelect("{$function}({$alias}.value) AS calculation");
                break;
        }

        $qb = $this->buildQuery($qb);

        $result = _elgg_services()->db->getDataRow($qb);

        // do not cast data as calculations could be used as int, float or string
        return $result->calculation;
    }

    public function get($limit = null, $offset = null, $callback = null) {
        $qb = Select::fromTable(EntityTable::TABLE_NAME, EntityTable::DEFAULT_JOIN_ALIAS);

        $distinct = $this->options->distinct ? 'DISTINCT ' : '';
        $qb->select("{$distinct}{$qb->getTableAlias()}.*");

        $this->expandInto($qb, $qb->getTableAlias());

        $qb = $this->buildQuery($qb);

        // add default ordering
        $original_order = elgg_extract('order_by', $this->options->__original_options);
        if (empty($this->options->order_by) && $original_order !== false) {
            $qb->addOrderBy("{$qb->getTableAlias()}.time_created", 'desc');
            // also add order by guid, to rely less on internals of MySQL fallback ordering
            $qb->addOrderBy("{$qb->getTableAlias()}.guid", 'desc');
        }

        if ($limit > 0) {
            $qb->setMaxResults((int) $limit);
            $qb->setFirstResult((int) $offset);
        }

        $options = $this->options->getArrayCopy();

        $options['limit'] = (int) $limit;
        $options['offset'] = (int) $offset;
        $options['callback'] = $callback ?: $this->options->callback;
        if (!isset($options['callback'])) {
            $options['callback'] = [_elgg_services()->entityTable, 'rowToElggStar'];
        }

        unset($options['count']);

        return _elgg_services()->entityTable->fetch($qb, $options);
    }
    
    public function getDates(): array {
        $qb = Select::fromTable(EntityTable::TABLE_NAME, EntityTable::DEFAULT_JOIN_ALIAS);

        $qb->select("DISTINCT EXTRACT(YEAR_MONTH FROM FROM_UNIXTIME({$qb->getTableAlias()}.time_created)) AS yearmonth");

        $this->expandInto($qb, $qb->getTableAlias());

        $qb = $this->buildQuery($qb);

        $options = $this->options->getArrayCopy();
        unset($options['count']);
        
        $options['callback'] = false;
        
        $results = _elgg_services()->entityTable->fetch($qb, $options);
        
        if (empty($results)) {
            return [];
        }
    
        return array_map(function ($e) {
            return $e->yearmonth;
        }, $results);
    }

    public function execute() {
        if ($this->options->annotation_calculation) {
            $clauses = $this->options->annotation_name_value_pairs;
            if (count($clauses) > 1 && $this->options->annotation_name_value_pairs_operator !== 'OR') {
                throw new LogicException('Annotation calculation can not be performed on multiple annotation name value pairs merged with AND');
            }

            $clause = array_shift($clauses);

            return $this->calculate($this->options->annotation_calculation, $clause->names, 'annotation');
        } else if ($this->options->metadata_calculation) {
            $clauses = $this->options->metadata_name_value_pairs;
            if (count($clauses) > 1 && $this->options->metadata_name_value_pairs_operator !== 'OR') {
                throw new LogicException('Metadata calculation can not be performed on multiple metadata name value pairs merged with AND');
            }

            $clause = array_shift($clauses);

            return $this->calculate($this->options->metadata_calculation, $clause->names, 'metadata');
        } else if ($this->options->count) {
            return $this->count();
        } else if ($this->options->batch) {
            return $this->batch($this->options->limit, $this->options->offset, $this->options->callback);
        } else {
            return $this->get($this->options->limit, $this->options->offset, $this->options->callback);
        }
    }

    protected function buildQuery(QueryBuilder $qb) {
        $ands = [];

        foreach ($this->options->joins as $join) {
            $join->prepare($qb, $qb->getTableAlias());
        }

        foreach ($this->options->wheres as $where) {
            $ands[] = $where->prepare($qb, $qb->getTableAlias());
        }

        $ands[] = $this->buildEntityClause($qb);
        $ands[] = $this->buildPairedMetadataClause($qb, $this->options->metadata_name_value_pairs, $this->options->metadata_name_value_pairs_operator);
        $ands[] = $this->buildPairedMetadataClause($qb, $this->options->search_name_value_pairs, 'OR');
        $ands[] = $this->buildPairedAnnotationClause($qb, $this->options->annotation_name_value_pairs, $this->options->annotation_name_value_pairs_operator);
        $ands[] = $this->buildPairedRelationshipClause($qb, $this->options->relationship_pairs);

        $ands = $qb->merge($ands);

        if (!empty($ands)) {
            $qb->andWhere($ands);
        }

        return $qb;
    }

    protected function buildEntityClause(QueryBuilder $qb) {
        return EntityWhereClause::factory($this->options)->prepare($qb, $qb->getTableAlias());
    }

    protected function buildPairedMetadataClause(QueryBuilder $qb, $clauses, $boolean = 'AND') {
        $parts = [];

        foreach ($clauses as $clause) {
            if ($clause instanceof MetadataWhereClause) {
                if (strtoupper($boolean) === 'OR' || count($clauses) === 1) {
                    $joined_alias = $qb->joinMetadataTable($qb->getTableAlias(), 'guid', null, 'inner', MetadataTable::DEFAULT_JOIN_ALIAS);
                } else {
                    $joined_alias = $qb->joinMetadataTable($qb->getTableAlias(), 'guid', $clause->names);
                }
                
                $parts[] = $clause->prepare($qb, $joined_alias);
            }
        }

        return $qb->merge($parts, $boolean);
    }

    protected function buildPairedAnnotationClause(QueryBuilder $qb, $clauses, $boolean = 'AND') {
        $parts = [];

        foreach ($clauses as $clause) {
            if (strtoupper($boolean) === 'OR' || count($clauses) === 1) {
                $joined_alias = $qb->joinAnnotationTable($qb->getTableAlias(), 'guid', null, 'inner', AnnotationsTable::DEFAULT_JOIN_ALIAS);
            } else {
                $joined_alias = $qb->joinAnnotationTable($qb->getTableAlias(), 'guid', $clause->names);
            }
            
            $parts[] = $clause->prepare($qb, $joined_alias);
        }

        return $qb->merge($parts, $boolean);
    }

    protected function buildPairedRelationshipClause(QueryBuilder $qb, $clauses, $boolean = 'AND') {
        $parts = [];

        foreach ($clauses as $clause) {
            if (strtoupper($boolean) === 'OR' || count($clauses) === 1) {
                $joined_alias = $qb->joinRelationshipTable($qb->getTableAlias(), $clause->join_on, null, $clause->inverse, 'inner', RelationshipsTable::DEFAULT_JOIN_ALIAS);
            } else {
                $joined_alias = $qb->joinRelationshipTable($qb->getTableAlias(), $clause->join_on, $clause->names, $clause->inverse);
            }
            
            $parts[] = $clause->prepare($qb, $joined_alias);
        }

        return $qb->merge($parts, $boolean);
    }
}