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<?php

namespace Faker\ORM\Doctrine;

use Doctrine\Common\Persistence\Mapping\ClassMetadata;
use Doctrine\Common\Persistence\ObjectManager;

/**
 * Service class for populating a table through a Doctrine Entity class.
 */
class EntityPopulator
{
    /**
     * @var ClassMetadata
     */
    protected $class;
    /**
     * @var array
     */
    protected $columnFormatters = [];
    /**
     * @var array
     */
    protected $modifiers = [];

    public function __construct(ClassMetadata $class)
    {
        $this->class = $class;
    }

    /**
     * @return string
     */
    public function getClass()
    {
        return $this->class->getName();
    }

    public function setColumnFormatters($columnFormatters)
    {
        $this->columnFormatters = $columnFormatters;
    }

    /**
     * @return array
     */
    public function getColumnFormatters()
    {
        return $this->columnFormatters;
    }

    public function mergeColumnFormattersWith($columnFormatters)
    {
        $this->columnFormatters = array_merge($this->columnFormatters, $columnFormatters);
    }

    public function setModifiers(array $modifiers)
    {
        $this->modifiers = $modifiers;
    }

    /**
     * @return array
     */
    public function getModifiers()
    {
        return $this->modifiers;
    }

    public function mergeModifiersWith(array $modifiers)
    {
        $this->modifiers = array_merge($this->modifiers, $modifiers);
    }

    /**
     * @return array
     */
    public function guessColumnFormatters(\Faker\Generator $generator)
    {
        $formatters = [];
        $nameGuesser = new \Faker\Guesser\Name($generator);
        $columnTypeGuesser = new ColumnTypeGuesser($generator);

        foreach ($this->class->getFieldNames() as $fieldName) {
            if ($this->class->isIdentifier($fieldName) || !$this->class->hasField($fieldName)) {
                continue;
            }

            $size = $this->class->fieldMappings[$fieldName]['length'] ?? null;

            if ($formatter = $nameGuesser->guessFormat($fieldName, $size)) {
                $formatters[$fieldName] = $formatter;

                continue;
            }

            if ($formatter = $columnTypeGuesser->guessFormat($fieldName, $this->class)) {
                $formatters[$fieldName] = $formatter;

                continue;
            }
        }

        foreach ($this->class->getAssociationNames() as $assocName) {
            if ($this->class->isCollectionValuedAssociation($assocName)) {
                continue;
            }

            $relatedClass = $this->class->getAssociationTargetClass($assocName);

            $unique = $optional = false;

            if ($this->class instanceof \Doctrine\ORM\Mapping\ClassMetadata) {
                $mappings = $this->class->getAssociationMappings();

                foreach ($mappings as $mapping) {
                    if ($mapping['targetEntity'] == $relatedClass) {
                        if ($mapping['type'] == \Doctrine\ORM\Mapping\ClassMetadata::ONE_TO_ONE) {
                            $unique = true;
                            $optional = $mapping['joinColumns'][0]['nullable'] ?? false;

                            break;
                        }
                    }
                }
            } elseif ($this->class instanceof \Doctrine\ODM\MongoDB\Mapping\ClassMetadata) {
                $mappings = $this->class->associationMappings;

                foreach ($mappings as $mapping) {
                    if ($mapping['targetDocument'] == $relatedClass) {
                        if ($mapping['type'] == \Doctrine\ODM\MongoDB\Mapping\ClassMetadata::ONE && $mapping['association'] == \Doctrine\ODM\MongoDB\Mapping\ClassMetadata::REFERENCE_ONE) {
                            $unique = true;
                            $optional = $mapping['nullable'] ?? false;

                            break;
                        }
                    }
                }
            }

            $index = 0;
            $formatters[$assocName] = static function ($inserted) use ($relatedClass, &$index, $unique, $optional, $generator) {
                if (isset($inserted[$relatedClass])) {
                    if ($unique) {
                        $related = null;

                        if (isset($inserted[$relatedClass][$index]) || !$optional) {
                            $related = $inserted[$relatedClass][$index];
                        }

                        ++$index;

                        return $related;
                    }

                    return $generator->randomElement($inserted[$relatedClass]);
                }

                return null;
            };
        }

        return $formatters;
    }

    /**
     * Insert one new record using the Entity class.
     *
     * @param bool $generateId
     *
     * @return EntityPopulator
     */
    public function execute(ObjectManager $manager, $insertedEntities, $generateId = false)
    {
        $obj = $this->class->newInstance();

        $this->fillColumns($obj, $insertedEntities);
        $this->callMethods($obj, $insertedEntities);

        if ($generateId) {
            $idsName = $this->class->getIdentifier();

            foreach ($idsName as $idName) {
                $id = $this->generateId($obj, $idName, $manager);
                $this->class->reflFields[$idName]->setValue($obj, $id);
            }
        }

        $manager->persist($obj);

        return $obj;
    }

    private function fillColumns($obj, $insertedEntities)
    {
        foreach ($this->columnFormatters as $field => $format) {
            if (null !== $format) {
                // Add some extended debugging information to any errors thrown by the formatter
                try {
                    $value = is_callable($format) ? $format($insertedEntities, $obj) : $format;
                } catch (\InvalidArgumentException $ex) {
                    throw new \InvalidArgumentException(sprintf(
                        'Failed to generate a value for %s::%s: %s',
                        get_class($obj),
                        $field,
                        $ex->getMessage()
                    ));
                }
                // Try a standard setter if it's available, otherwise fall back on reflection
                $setter = sprintf('set%s', ucfirst($field));

                if (is_callable([$obj, $setter])) {
                    $obj->$setter($value);
                } else {
                    $this->class->reflFields[$field]->setValue($obj, $value);
                }
            }
        }
    }

    private function callMethods($obj, $insertedEntities)
    {
        foreach ($this->getModifiers() as $modifier) {
            $modifier($obj, $insertedEntities);
        }
    }

    /**
     * @return int|null
     */
    private function generateId($obj, $column, ObjectManager $manager)
    {
        /** @var \Doctrine\Common\Persistence\ObjectRepository $repository */
        $repository = $manager->getRepository(get_class($obj));
        $result = $repository->createQueryBuilder('e')
                ->select(sprintf('e.%s', $column))
                ->getQuery()
                ->execute();
        $ids = array_map('current', $result->toArray());

        $id = null;

        do {
            $id = mt_rand();
        } while (in_array($id, $ids, false));

        return $id;
    }
}