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<?php

declare(strict_types = 1);

namespace Spameri\ElasticQuery\Query;

/**

* @see https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-mlt-query.html

class MoreLikeThis implements \Spameri\ElasticQuery\Query\LeafQueryInterface

{

/**

* @param array<int, string> $fields

* @param array<int, string|array<string, mixed>> $like Texts or doc refs (['_index' => ..., '_id' => ...]).

* @param array<int, string|array<string, mixed>> $unlike

* @param array<int, string> $stopWords

public function __construct(

private array $fields,

private array $like,

private array $unlike = [],

private int|null $minTermFreq = null,

private int|null $maxQueryTerms = null,

private int|string|null $minimumShouldMatch = null,

private float|null $boostTerms = null,

private bool|null $include = null,

private int|null $minDocFreq = null,

private int|null $maxDocFreq = null,

private int|null $minWordLength = null,

private int|null $maxWordLength = null,

private array $stopWords = [],

private string|null $analyzer = null,

private float $boost = 1.0,

private bool|null $failOnUnsupportedField = null,

)

{

if ($fields === []) {

throw new \Spameri\ElasticQuery\Exception\InvalidArgumentException(

'MoreLikeThis query requires at least one field.',

);

}

if ($like === []) {

throw new \Spameri\ElasticQuery\Exception\InvalidArgumentException(

'MoreLikeThis query requires at least one like value.',

);

}

public function key(): string

{

return 'more_like_this_' . \implode('-', $this->fields);

}

/**

* @return array<string, array<string, mixed>>

public function toArray(): array

{

$body = [

'fields' => $this->fields,

'like' => $this->like,

'boost' => $this->boost,

];

if ($this->unlike !== []) {

$body['unlike'] = $this->unlike;

}

if ($this->minTermFreq !== null) {

$body['min_term_freq'] = $this->minTermFreq;

}

if ($this->maxQueryTerms !== null) {

$body['max_query_terms'] = $this->maxQueryTerms;

}

if ($this->minimumShouldMatch !== null) {

$body['minimum_should_match'] = $this->minimumShouldMatch;

}

if ($this->boostTerms !== null) {

$body['boost_terms'] = $this->boostTerms;

}

if ($this->include !== null) {

$body['include'] = $this->include;

}

if ($this->minDocFreq !== null) {

$body['min_doc_freq'] = $this->minDocFreq;

}

if ($this->maxDocFreq !== null) {

$body['max_doc_freq'] = $this->maxDocFreq;

}

if ($this->minWordLength !== null) {

$body['min_word_length'] = $this->minWordLength;

}

if ($this->maxWordLength !== null) {

$body['max_word_length'] = $this->maxWordLength;

}

if ($this->stopWords !== []) {

$body['stop_words'] = $this->stopWords;

}

if ($this->analyzer !== null) {

$body['analyzer'] = $this->analyzer;

}

if ($this->failOnUnsupportedField !== null) {

$body['fail_on_unsupported_field'] = $this->failOnUnsupportedField;

}

return [

'more_like_this' => $body,

];

}

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