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<?php

declare(strict_types=1);

namespace Doctrine\ORM\Mapping;

use Doctrine\Deprecations\Deprecation;

use function preg_replace;
use function str_contains;
use function strrpos;
use function strtolower;
use function strtoupper;
use function substr;

use const CASE_LOWER;
use const CASE_UPPER;

/**
 * Naming strategy implementing the underscore naming convention.
 * Converts 'MyEntity' to 'my_entity' or 'MY_ENTITY'.
 *
 * @link    www.doctrine-project.org
 */
class UnderscoreNamingStrategy implements NamingStrategy
{
    private const DEFAULT_PATTERN      = '/(?<=[a-z])([A-Z])/';
    private const NUMBER_AWARE_PATTERN = '/(?<=[a-z0-9])([A-Z])/';

    /** @var int */
    private $case;

    /**
     * @var string
     * @psalm-var non-empty-string
     */
    private $pattern;

    /**
     * Underscore naming strategy construct.
     *
     * @param int $case CASE_LOWER | CASE_UPPER
     */
    public function __construct($case = CASE_LOWER, bool $numberAware = false)
    {
        if (! $numberAware) {
            Deprecation::trigger(
                'doctrine/orm',
                'https://github.com/doctrine/orm/pull/7908',
                'Creating %s without setting second argument $numberAware=true is deprecated and will be removed in Doctrine ORM 3.0.',
                self::class
            );
        }

        $this->case    = $case;
        $this->pattern = $numberAware ? self::NUMBER_AWARE_PATTERN : self::DEFAULT_PATTERN;
    }

    /** @return int CASE_LOWER | CASE_UPPER */
    public function getCase()
    {
        return $this->case;
    }

    /**
     * Sets string case CASE_LOWER | CASE_UPPER.
     * Alphabetic characters converted to lowercase or uppercase.
     *
     * @param int $case
     *
     * @return void
     */
    public function setCase($case)
    {
        $this->case = $case;
    }

    /**
     * {@inheritDoc}
     */
    public function classToTableName($className)
    {
        if (str_contains($className, '\\')) {
            $className = substr($className, strrpos($className, '\\') + 1);
        }

        return $this->underscore($className);
    }

    /**
     * {@inheritDoc}
     */
    public function propertyToColumnName($propertyName, $className = null)
    {
        return $this->underscore($propertyName);
    }

    /**
     * {@inheritDoc}
     */
    public function embeddedFieldToColumnName($propertyName, $embeddedColumnName, $className = null, $embeddedClassName = null)
    {
        return $this->underscore($propertyName) . '_' . $embeddedColumnName;
    }

    /**
     * {@inheritDoc}
     */
    public function referenceColumnName()
    {
        return $this->case === CASE_UPPER ?  'ID' : 'id';
    }

    /**
     * {@inheritDoc}
     *
     * @param string       $propertyName
     * @param class-string $className
     */
    public function joinColumnName($propertyName, $className = null)
    {
        return $this->underscore($propertyName) . '_' . $this->referenceColumnName();
    }

    /**
     * {@inheritDoc}
     */
    public function joinTableName($sourceEntity, $targetEntity, $propertyName = null)
    {
        return $this->classToTableName($sourceEntity) . '_' . $this->classToTableName($targetEntity);
    }

    /**
     * {@inheritDoc}
     */
    public function joinKeyColumnName($entityName, $referencedColumnName = null)
    {
        return $this->classToTableName($entityName) . '_' .
                ($referencedColumnName ?: $this->referenceColumnName());
    }

    private function underscore(string $string): string
    {
        $string = preg_replace($this->pattern, '_$1', $string);

        if ($this->case === CASE_UPPER) {
            return strtoupper($string);
        }

        return strtolower($string);
    }
}