<?php

/**
 * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
 * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
 * SPDX-License-Identifier: AGPL-3.0-only
 */
namespace OC\DB\QueryBuilder\ExpressionBuilder;

use Doctrine\DBAL\Query\Expression\ExpressionBuilder as DoctrineExpressionBuilder;
use OC\DB\ConnectionAdapter;
use OC\DB\QueryBuilder\CompositeExpression;
use OC\DB\QueryBuilder\FunctionBuilder\FunctionBuilder;
use OC\DB\QueryBuilder\Literal;
use OC\DB\QueryBuilder\QueryFunction;
use OC\DB\QueryBuilder\QuoteHelper;
use OCP\DB\QueryBuilder\ICompositeExpression;
use OCP\DB\QueryBuilder\IExpressionBuilder;
use OCP\DB\QueryBuilder\ILiteral;
use OCP\DB\QueryBuilder\IParameter;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\DB\QueryBuilder\IQueryFunction;
use OCP\IDBConnection;
use Psr\Log\LoggerInterface;

class ExpressionBuilder implements IExpressionBuilder {
	/** @var \Doctrine\DBAL\Query\Expression\ExpressionBuilder */
	protected $expressionBuilder;

	/** @var QuoteHelper */
	protected $helper;

	/** @var IDBConnection */
	protected $connection;

	/** @var LoggerInterface */
	protected $logger;

	/** @var FunctionBuilder */
	protected $functionBuilder;

	public function __construct(ConnectionAdapter $connection, IQueryBuilder $queryBuilder, LoggerInterface $logger) {
		$this->connection = $connection;
		$this->logger = $logger;
		$this->helper = new QuoteHelper();
		$this->expressionBuilder = new DoctrineExpressionBuilder($connection->getInner());
		$this->functionBuilder = $queryBuilder->func();
	}

	/**
	 * Creates a conjunction of the given boolean expressions.
	 *
	 * Example:
	 *
	 *     [php]
	 *     // (u.type = ?) AND (u.role = ?)
	 *     $expr->andX('u.type = ?', 'u.role = ?'));
	 *
	 * @param mixed ...$x Optional clause. Defaults = null, but requires
	 *                    at least one defined when converting to string.
	 *
	 * @return \OCP\DB\QueryBuilder\ICompositeExpression
	 */
	public function andX(...$x): ICompositeExpression {
		if (empty($x)) {
			$this->logger->debug('Calling ' . IQueryBuilder::class . '::' . __FUNCTION__ . ' without parameters is deprecated and will throw soon.', ['exception' => new \Exception('No parameters in call to ' . __METHOD__)]);
		}
		return new CompositeExpression(CompositeExpression::TYPE_AND, $x);
	}

	/**
	 * Creates a disjunction of the given boolean expressions.
	 *
	 * Example:
	 *
	 *     [php]
	 *     // (u.type = ?) OR (u.role = ?)
	 *     $qb->where($qb->expr()->orX('u.type = ?', 'u.role = ?'));
	 *
	 * @param mixed ...$x Optional clause. Defaults = null, but requires
	 *                    at least one defined when converting to string.
	 *
	 * @return \OCP\DB\QueryBuilder\ICompositeExpression
	 */
	public function orX(...$x): ICompositeExpression {
		if (empty($x)) {
			$this->logger->debug('Calling ' . IQueryBuilder::class . '::' . __FUNCTION__ . ' without parameters is deprecated and will throw soon.', ['exception' => new \Exception('No parameters in call to ' . __METHOD__)]);
		}
		return new CompositeExpression(CompositeExpression::TYPE_OR, $x);
	}

	/**
	 * Creates a comparison expression.
	 *
	 * @param mixed $x The left expression.
	 * @param string $operator One of the IExpressionBuilder::* constants.
	 * @param mixed $y The right expression.
	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
	 *                         required when comparing text fields for oci compatibility
	 *
	 * @return string
	 */
	public function comparison($x, string $operator, $y, $type = null): string {
		$x = $this->prepareColumn($x, $type);
		$y = $this->prepareColumn($y, $type);
		return $this->expressionBuilder->comparison($x, $operator, $y);
	}

	/**
	 * Creates an equality comparison expression with the given arguments.
	 *
	 * First argument is considered the left expression and the second is the right expression.
	 * When converted to string, it will generated a <left expr> = <right expr>. Example:
	 *
	 *     [php]
	 *     // u.id = ?
	 *     $expr->eq('u.id', '?');
	 *
	 * @param mixed $x The left expression.
	 * @param mixed $y The right expression.
	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
	 *                         required when comparing text fields for oci compatibility
	 *
	 * @return string
	 */
	public function eq($x, $y, $type = null): string {
		$x = $this->prepareColumn($x, $type);
		$y = $this->prepareColumn($y, $type);
		return $this->expressionBuilder->eq($x, $y);
	}

	/**
	 * Creates a non equality comparison expression with the given arguments.
	 * First argument is considered the left expression and the second is the right expression.
	 * When converted to string, it will generated a <left expr> <> <right expr>. Example:
	 *
	 *     [php]
	 *     // u.id <> 1
	 *     $q->where($q->expr()->neq('u.id', '1'));
	 *
	 * @param mixed $x The left expression.
	 * @param mixed $y The right expression.
	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
	 *                         required when comparing text fields for oci compatibility
	 *
	 * @return string
	 */
	public function neq($x, $y, $type = null): string {
		$x = $this->prepareColumn($x, $type);
		$y = $this->prepareColumn($y, $type);
		return $this->expressionBuilder->neq($x, $y);
	}

	/**
	 * Creates a lower-than comparison expression with the given arguments.
	 * First argument is considered the left expression and the second is the right expression.
	 * When converted to string, it will generated a <left expr> < <right expr>. Example:
	 *
	 *     [php]
	 *     // u.id < ?
	 *     $q->where($q->expr()->lt('u.id', '?'));
	 *
	 * @param mixed $x The left expression.
	 * @param mixed $y The right expression.
	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
	 *                         required when comparing text fields for oci compatibility
	 *
	 * @return string
	 */
	public function lt($x, $y, $type = null): string {
		$x = $this->prepareColumn($x, $type);
		$y = $this->prepareColumn($y, $type);
		return $this->expressionBuilder->lt($x, $y);
	}

	/**
	 * Creates a lower-than-equal comparison expression with the given arguments.
	 * First argument is considered the left expression and the second is the right expression.
	 * When converted to string, it will generated a <left expr> <= <right expr>. Example:
	 *
	 *     [php]
	 *     // u.id <= ?
	 *     $q->where($q->expr()->lte('u.id', '?'));
	 *
	 * @param mixed $x The left expression.
	 * @param mixed $y The right expression.
	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
	 *                         required when comparing text fields for oci compatibility
	 *
	 * @return string
	 */
	public function lte($x, $y, $type = null): string {
		$x = $this->prepareColumn($x, $type);
		$y = $this->prepareColumn($y, $type);
		return $this->expressionBuilder->lte($x, $y);
	}

	/**
	 * Creates a greater-than comparison expression with the given arguments.
	 * First argument is considered the left expression and the second is the right expression.
	 * When converted to string, it will generated a <left expr> > <right expr>. Example:
	 *
	 *     [php]
	 *     // u.id > ?
	 *     $q->where($q->expr()->gt('u.id', '?'));
	 *
	 * @param mixed $x The left expression.
	 * @param mixed $y The right expression.
	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
	 *                         required when comparing text fields for oci compatibility
	 *
	 * @return string
	 */
	public function gt($x, $y, $type = null): string {
		$x = $this->prepareColumn($x, $type);
		$y = $this->prepareColumn($y, $type);
		return $this->expressionBuilder->gt($x, $y);
	}

	/**
	 * Creates a greater-than-equal comparison expression with the given arguments.
	 * First argument is considered the left expression and the second is the right expression.
	 * When converted to string, it will generated a <left expr> >= <right expr>. Example:
	 *
	 *     [php]
	 *     // u.id >= ?
	 *     $q->where($q->expr()->gte('u.id', '?'));
	 *
	 * @param mixed $x The left expression.
	 * @param mixed $y The right expression.
	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
	 *                         required when comparing text fields for oci compatibility
	 *
	 * @return string
	 */
	public function gte($x, $y, $type = null): string {
		$x = $this->prepareColumn($x, $type);
		$y = $this->prepareColumn($y, $type);
		return $this->expressionBuilder->gte($x, $y);
	}

	/**
	 * Creates an IS NULL expression with the given arguments.
	 *
	 * @param string|ILiteral|IParameter|IQueryFunction $x The field in string format to be restricted by IS NULL.
	 *
	 * @return string
	 */
	public function isNull($x): string {
		$x = $this->helper->quoteColumnName($x);
		return $this->expressionBuilder->isNull($x);
	}

	/**
	 * Creates an IS NOT NULL expression with the given arguments.
	 *
	 * @param string|ILiteral|IParameter|IQueryFunction $x The field in string format to be restricted by IS NOT NULL.
	 *
	 * @return string
	 */
	public function isNotNull($x): string {
		$x = $this->helper->quoteColumnName($x);
		return $this->expressionBuilder->isNotNull($x);
	}

	/**
	 * Creates a LIKE() comparison expression with the given arguments.
	 *
	 * @param ILiteral|IParameter|IQueryFunction|string $x Field in string format to be inspected by LIKE() comparison.
	 * @param mixed $y Argument to be used in LIKE() comparison.
	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
	 *                         required when comparing text fields for oci compatibility
	 *
	 * @return string
	 */
	public function like($x, $y, $type = null): string {
		$x = $this->helper->quoteColumnName($x);
		$y = $this->helper->quoteColumnName($y);
		return $this->expressionBuilder->like($x, $y);
	}

	/**
	 * Creates a ILIKE() comparison expression with the given arguments.
	 *
	 * @param string $x Field in string format to be inspected by ILIKE() comparison.
	 * @param mixed $y Argument to be used in ILIKE() comparison.
	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
	 *                         required when comparing text fields for oci compatibility
	 *
	 * @return string
	 * @since 9.0.0
	 */
	public function iLike($x, $y, $type = null): string {
		return $this->expressionBuilder->like($this->functionBuilder->lower($x), $this->functionBuilder->lower($y));
	}

	/**
	 * Creates a NOT LIKE() comparison expression with the given arguments.
	 *
	 * @param ILiteral|IParameter|IQueryFunction|string $x Field in string format to be inspected by NOT LIKE() comparison.
	 * @param mixed $y Argument to be used in NOT LIKE() comparison.
	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
	 *                         required when comparing text fields for oci compatibility
	 *
	 * @return string
	 */
	public function notLike($x, $y, $type = null): string {
		$x = $this->helper->quoteColumnName($x);
		$y = $this->helper->quoteColumnName($y);
		return $this->expressionBuilder->notLike($x, $y);
	}

	/**
	 * Creates a IN () comparison expression with the given arguments.
	 *
	 * @param ILiteral|IParameter|IQueryFunction|string $x The field in string format to be inspected by IN() comparison.
	 * @param ILiteral|IParameter|IQueryFunction|string|array $y The placeholder or the array of values to be used by IN() comparison.
	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
	 *                         required when comparing text fields for oci compatibility
	 *
	 * @return string
	 */
	public function in($x, $y, $type = null): string {
		$x = $this->helper->quoteColumnName($x);
		$y = $this->helper->quoteColumnNames($y);
		return $this->expressionBuilder->in($x, $y);
	}

	/**
	 * Creates a NOT IN () comparison expression with the given arguments.
	 *
	 * @param ILiteral|IParameter|IQueryFunction|string $x The field in string format to be inspected by NOT IN() comparison.
	 * @param ILiteral|IParameter|IQueryFunction|string|array $y The placeholder or the array of values to be used by NOT IN() comparison.
	 * @param mixed|null $type one of the IQueryBuilder::PARAM_* constants
	 *                         required when comparing text fields for oci compatibility
	 *
	 * @return string
	 */
	public function notIn($x, $y, $type = null): string {
		$x = $this->helper->quoteColumnName($x);
		$y = $this->helper->quoteColumnNames($y);
		return $this->expressionBuilder->notIn($x, $y);
	}

	/**
	 * Creates a $x = '' statement, because Oracle needs a different check
	 *
	 * @param string|ILiteral|IParameter|IQueryFunction $x The field in string format to be inspected by the comparison.
	 * @return string
	 * @since 13.0.0
	 */
	public function emptyString($x): string {
		return $this->eq($x, $this->literal('', IQueryBuilder::PARAM_STR));
	}

	/**
	 * Creates a `$x <> ''` statement, because Oracle needs a different check
	 *
	 * @param string|ILiteral|IParameter|IQueryFunction $x The field in string format to be inspected by the comparison.
	 * @return string
	 * @since 13.0.0
	 */
	public function nonEmptyString($x): string {
		return $this->neq($x, $this->literal('', IQueryBuilder::PARAM_STR));
	}

	/**
	 * Binary AND Operator copies a bit to the result if it exists in both operands.
	 *
	 * @param string|ILiteral $x The field or value to check
	 * @param int $y Bitmap that must be set
	 * @return IQueryFunction
	 * @since 12.0.0
	 */
	public function bitwiseAnd($x, int $y): IQueryFunction {
		return new QueryFunction($this->connection->getDatabasePlatform()->getBitAndComparisonExpression(
			$this->helper->quoteColumnName($x),
			$y
		));
	}

	/**
	 * Binary OR Operator copies a bit if it exists in either operand.
	 *
	 * @param string|ILiteral $x The field or value to check
	 * @param int $y Bitmap that must be set
	 * @return IQueryFunction
	 * @since 12.0.0
	 */
	public function bitwiseOr($x, int $y): IQueryFunction {
		return new QueryFunction($this->connection->getDatabasePlatform()->getBitOrComparisonExpression(
			$this->helper->quoteColumnName($x),
			$y
		));
	}

	/**
	 * Quotes a given input parameter.
	 *
	 * @param mixed $input The parameter to be quoted.
	 * @param int $type One of the IQueryBuilder::PARAM_* constants
	 *
	 * @return ILiteral
	 */
	public function literal($input, $type = IQueryBuilder::PARAM_STR): ILiteral {
		return new Literal($this->expressionBuilder->literal($input, $type));
	}

	/**
	 * Returns a IQueryFunction that casts the column to the given type
	 *
	 * @param string|IQueryFunction $column
	 * @param mixed $type One of IQueryBuilder::PARAM_*
	 * @psalm-param IQueryBuilder::PARAM_* $type
	 * @return IQueryFunction
	 */
	public function castColumn($column, $type): IQueryFunction {
		return new QueryFunction(
			$this->helper->quoteColumnName($column)
		);
	}

	/**
	 * @param mixed $column
	 * @param mixed|null $type
	 * @return array|IQueryFunction|string
	 */
	protected function prepareColumn($column, $type) {
		return $this->helper->quoteColumnNames($column);
	}
}
