<?php

/**

 * Meta API: WP_Meta_Query class

 *

 * @package WordPress

 * @subpackage Meta

 * @since 4.4.0

 */

/**

 * Core class used to implement meta queries for the Meta API.

 *

 * Used for generating SQL clauses that filter a primary query according to metadata keys and values.

 *

 * WP_Meta_Query is a helper that allows primary query classes, such as WP_Query and WP_User_Query,

 *

 * to filter their results by object metadata, by generating `JOIN` and `WHERE` subclauses to be attached

 * to the primary SQL query string.

 *

 * @since 3.2.0

 */

class WP_Meta_Query {

	/**

	 * Array of metadata queries.

	 *

	 * See WP_Meta_Query::__construct() for information on meta query arguments.

	 *

	 * @since 3.2.0

	 * @var array

	 */

	public $queries = array();

	/**

	 * The relation between the queries. Can be one of 'AND' or 'OR'.

	 *

	 * @since 3.2.0

	 * @var string

	 */

	public $relation;

	/**

	 * Database table to query for the metadata.

	 *

	 * @since 4.1.0

	 * @var string

	 */

	public $meta_table;

	/**

	 * Column in meta_table that represents the ID of the object the metadata belongs to.

	 *

	 * @since 4.1.0

	 * @var string

	 */

	public $meta_id_column;

	/**

	 * Database table that where the metadata's objects are stored (eg $wpdb->users).

	 *

	 * @since 4.1.0

	 * @var string

	 */

	public $primary_table;

	/**

	 * Column in primary_table that represents the ID of the object.

	 *

	 * @since 4.1.0

	 * @var string

	 */

	public $primary_id_column;

	/**

	 * A flat list of table aliases used in JOIN clauses.

	 *

	 * @since 4.1.0

	 * @var array

	 */

	protected $table_aliases = array();

	/**

	 * A flat list of clauses, keyed by clause 'name'.

	 *

	 * @since 4.2.0

	 * @var array

	 */

	protected $clauses = array();

	/**

	 * Whether the query contains any OR relations.

	 *

	 * @since 4.3.0

	 * @var bool

	 */

	protected $has_or_relation = false;

	/**

	 * Constructor.

	 *

	 * @since 3.2.0

	 * @since 4.2.0 Introduced support for naming query clauses by associative array keys.

	 * @since 5.1.0 Introduced `$compare_key` clause parameter, which enables LIKE key matches.

	 * @since 5.3.0 Increased the number of operators available to `$compare_key`. Introduced `$type_key`,

	 *              which enables the `$key` to be cast to a new data type for comparisons.

	 *

	 * @param array $meta_query {

	 *     Array of meta query clauses. When first-order clauses or sub-clauses use strings as

	 *     their array keys, they may be referenced in the 'orderby' parameter of the parent query.

	 *

	 *     @type string $relation Optional. The MySQL keyword used to join the clauses of the query.

	 *                            Accepts 'AND' or 'OR'. Default 'AND'.

	 *     @type array  ...$0 {

	 *         Optional. An array of first-order clause parameters, or another fully-formed meta query.

	 *

	 *         @type string|string[] $key         Meta key or keys to filter by.

	 *         @type string          $compare_key MySQL operator used for comparing the $key. Accepts:

	 *                                            - '='

	 *                                            - '!='

	 *                                            - 'LIKE'

	 *                                            - 'NOT LIKE'

	 *                                            - 'IN'

	 *                                            - 'NOT IN'

	 *                                            - 'REGEXP'

	 *                                            - 'NOT REGEXP'

	 *                                            - 'EXISTS' (alias of '=')

	 *                                            - 'NOT EXISTS' (alias of '!=')

	 *                                            Default is 'IN' when `$key` is an array, '=' otherwise.

	 *         @type string          $type_key    MySQL data type that the meta_key column will be CAST to for

	 *                                            comparisons. Accepts 'BINARY' for case-sensitive regular expression

	 *                                            comparisons. Default is ''.

	 *         @type string|string[] $value       Meta value or values to filter by.

	 *         @type string          $compare     MySQL operator used for comparing the $value. Accepts:

	 *                                            - '!='

	 *                                            - '>'

	 *                                            - '>='

	 *                                            - '<'

	 *                                            - '<='

	 *                                            - 'LIKE'

	 *                                            - 'NOT LIKE'

	 *                                            - 'IN'

	 *                                            - 'NOT IN'

	 *                                            - 'BETWEEN'

	 *                                            - 'NOT BETWEEN'

	 *                                            - 'REGEXP'

	 *                                            - 'NOT REGEXP'

	 *                                            - 'RLIKE'

	 *                                            - 'EXISTS'

	 *                                            - 'NOT EXISTS'

	 *                                            Default is 'IN' when `$value` is an array, '=' otherwise.

	 *         @type string          $type        MySQL data type that the meta_value column will be CAST to for

	 *                                            comparisons. Accepts:

	 *                                            - 'NUMERIC'

	 *                                            - 'BINARY'

	 *                                            - 'CHAR'

	 *                                            - 'DATE'

	 *                                            - 'DATETIME'

	 *                                            - 'DECIMAL'

	 *                                            - 'SIGNED'

	 *                                            - 'TIME'

	 *                                            - 'UNSIGNED'

	 *                                            Default is 'CHAR'.

	 *     }

	 * }

	 */

	public function __construct( $meta_query = false ) {

		if ( ! $meta_query ) {

			return;

		}

		if ( isset( $meta_query['relation'] ) && 'OR' === strtoupper( $meta_query['relation'] ) ) {

			$this->relation = 'OR';

		} else {

			$this->relation = 'AND';

		}

		$this->queries = $this->sanitize_query( $meta_query );

	}

	/**

	 *

	 * Eliminates empty items and ensures that a 'relation' is set.

	 *

	 * @since 4.1.0

	 *

	 * @param array $queries Array of query clauses.

	 * @return array Sanitized array of query clauses.

	 */

	public function sanitize_query( $queries ) {

		$clean_queries = array();

		if ( ! is_array( $queries ) ) {

			return $clean_queries;

		}

		foreach ( $queries as $key => $query ) {

			if ( 'relation' === $key ) {

				$relation = $query;

			} elseif ( ! is_array( $query ) ) {

				continue;

				// First-order clause.

			} elseif ( $this->is_first_order_clause( $query ) ) {

				if ( isset( $query['value'] ) && array() === $query['value'] ) {

					unset( $query['value'] );

				}

				$clean_queries[ $key ] = $query;

				// Otherwise, it's a nested query, so we recurse.

			} else {

				$cleaned_query = $this->sanitize_query( $query );

				if ( ! empty( $cleaned_query ) ) {

					$clean_queries[ $key ] = $cleaned_query;

				}

			}

		}

		if ( empty( $clean_queries ) ) {

			return $clean_queries;

		}

		// Sanitize the 'relation' key provided in the query.

		if ( isset( $relation ) && 'OR' === strtoupper( $relation ) ) {

			$clean_queries['relation'] = 'OR';

			$this->has_or_relation     = true;

			/*

			* If there is only a single clause, call the relation 'OR'.

			* This value will not actually be used to join clauses, but it

			* simplifies the logic around combining key-only queries.

			*/

		} elseif ( 1 === count( $clean_queries ) ) {

			$clean_queries['relation'] = 'OR';

			// Default to AND.

		} else {

			$clean_queries['relation'] = 'AND';

		}

		return $clean_queries;

	}

	/**

	 *

	 * A first-order meta query clause is one that has either a 'key' or

	 * a 'value' array key.

	 *

	 * @since 4.1.0

	 *

	 * @param array $query Meta query arguments.

	 * @return bool Whether the query clause is a first-order clause.

	 */

	protected function is_first_order_clause( $query ) {

		return isset( $query['key'] ) || isset( $query['value'] );

	}

	/**

	 * Constructs a meta query based on 'meta_*' query vars

	 *

	 * @since 3.2.0

	 *

	 */

	public function parse_query_vars( $qv ) {

		$meta_query = array();

		/*

		 * For orderby=meta_value to work correctly, simple query needs to be

		 * first (so that its table join is against an unaliased meta table) and

		 * needs to be its own clause (so it doesn't interfere with the logic of

		 * the rest of the meta_query).

		 */

		$primary_meta_query = array();

		foreach ( array( 'key', 'compare', 'type', 'compare_key', 'type_key' ) as $key ) {

			if ( ! empty( $qv[ "meta_$key" ] ) ) {

				$primary_meta_query[ $key ] = $qv[ "meta_$key" ];

			}

		}

		// WP_Query sets 'meta_value' = '' by default.

		if ( isset( $qv['meta_value'] ) && '' !== $qv['meta_value'] && ( ! is_array( $qv['meta_value'] ) || $qv['meta_value'] ) ) {

			$primary_meta_query['value'] = $qv['meta_value'];

		}

		$existing_meta_query = isset( $qv['meta_query'] ) && is_array( $qv['meta_query'] ) ? $qv['meta_query'] : array();

		if ( ! empty( $primary_meta_query ) && ! empty( $existing_meta_query ) ) {

			$meta_query = array(

				'relation' => 'AND',

				$primary_meta_query,

				$existing_meta_query,

			);

		} elseif ( ! empty( $primary_meta_query ) ) {

			$meta_query = array(

				$primary_meta_query,

			);

		} elseif ( ! empty( $existing_meta_query ) ) {

			$meta_query = $existing_meta_query;

		}

		$this->__construct( $meta_query );

	}

	/**

	 *

	 * @since 3.7.0

	 *

	 * @param string $type MySQL type to cast meta_value.

	 * @return string MySQL type.

	 */

	public function get_cast_for_type( $type = '' ) {

		if ( empty( $type ) ) {

			return 'CHAR';

		}

		$meta_type = strtoupper( $type );

		if ( ! preg_match( '/^(?:BINARY|CHAR|DATE|DATETIME|SIGNED|UNSIGNED|TIME|NUMERIC(?:\(\d+(?:,\s?\d+)?\))?|DECIMAL(?:\(\d+(?:,\s?\d+)?\))?)$/', $meta_type ) ) {

			return 'CHAR';

		}

		if ( 'NUMERIC' === $meta_type ) {

			$meta_type = 'SIGNED';

		}

		return $meta_type;

	}

	/**

	 * Generates SQL clauses to be appended to a main query.

	 *

	 * @since 3.2.0

	 *

	 * @param string $type              Type of meta. Possible values include but are not limited

	 *                                  to 'post', 'comment', 'blog', 'term', and 'user'.

	 * @param string $primary_table     Database table where the object being filtered is stored (eg wp_users).

	 * @param string $primary_id_column ID column for the filtered object in $primary_table.

	 * @param object $context           Optional. The main query object that corresponds to the type, for

	 *                                  example a `WP_Query`, `WP_User_Query`, or `WP_Site_Query`.

	 * @return string[]|false {

	 *     Array containing JOIN and WHERE SQL clauses to append to the main query,

	 *     or false if no table exists for the requested meta type.

	 *

	 *     @type string $join  SQL fragment to append to the main JOIN clause.

	 *     @type string $where SQL fragment to append to the main WHERE clause.

	 * }

	 */

	public function get_sql( $type, $primary_table, $primary_id_column, $context = null ) {

		$meta_table = _get_meta_table( $type );

		if ( ! $meta_table ) {

			return false;

		}

		$this->table_aliases = array();

		$this->meta_table     = $meta_table;

		$this->meta_id_column = sanitize_key( $type . '_id' );

		$this->primary_table     = $primary_table;

		$this->primary_id_column = $primary_id_column;

		$sql = $this->get_sql_clauses();

		/*

		 * If any JOINs are LEFT JOINs (as in the case of NOT EXISTS), then all JOINs should

		 * be LEFT. Otherwise posts with no metadata will be excluded from results.

		 */

			$sql['join'] = str_replace( 'INNER JOIN', 'LEFT JOIN', $sql['join'] );

		}

		/**

		 * Filters the meta query's generated SQL.

		 *

		 * @since 3.1.0

		 *

		 * @param string[] $sql               Array containing the query's JOIN and WHERE clauses.

		 * @param array    $queries           Array of meta queries.

		 * @param string   $type              Type of meta. Possible values include but are not limited

		 *                                    to 'post', 'comment', 'blog', 'term', and 'user'.

		 * @param string   $primary_table     Primary table.

		 * @param string   $primary_id_column Primary column ID.

		 * @param object   $context           The main query object that corresponds to the type, for

		 *                                    example a `WP_Query`, `WP_User_Query`, or `WP_Site_Query`.

		 */

		return apply_filters_ref_array( 'get_meta_sql', array( $sql, $this->queries, $type, $primary_table, $primary_id_column, $context ) );

	}

	/**

	 *

	 * Called by the public WP_Meta_Query::get_sql(), this method is abstracted

	 * out to maintain parity with the other Query classes.

	 *

	 * @since 4.1.0

	 *

	 * @return string[] {

	 *     Array containing JOIN and WHERE SQL clauses to append to the main query.

	 *

	 *     @type string $join  SQL fragment to append to the main JOIN clause.

	 *     @type string $where SQL fragment to append to the main WHERE clause.

	 * }

	 */

	protected function get_sql_clauses() {

		/*

		 * $queries are passed by reference to get_sql_for_query() for recursion.

		 * To keep $this->queries unaltered, pass a copy.

		 */

		$queries = $this->queries;

		$sql     = $this->get_sql_for_query( $queries );

		if ( ! empty( $sql['where'] ) ) {

			$sql['where'] = ' AND ' . $sql['where'];

		}

		return $sql;

	}

	/**

	 *

	 * If nested subqueries are found, this method recurses the tree to

	 * produce the properly nested SQL.

	 *

	 * @since 4.1.0

	 *

	 * @param array $query Query to parse (passed by reference).

	 * @param int   $depth Optional. Number of tree levels deep we currently are.

	 *                     Used to calculate indentation. Default 0.

	 * @return string[] {

	 *     Array containing JOIN and WHERE SQL clauses to append to a single query array.

	 *

	 *     @type string $join  SQL fragment to append to the main JOIN clause.

	 *     @type string $where SQL fragment to append to the main WHERE clause.

	 * }

	 */

	protected function get_sql_for_query( &$query, $depth = 0 ) {

		$sql_chunks = array(