<?php

namespace Ulmus\Attribute\Property;

use Ulmus\Attribute\Attribute;
use Ulmus\Query;

#[\Attribute(\Attribute::TARGET_PROPERTY | \Attribute::IS_REPEATABLE)]
class Where {
    public function __construct(
        public string|\Stringable|array $field,
        public mixed $value = null,
        public string $operator = Query\Where::OPERATOR_EQUAL,
        public string $condition = Query\Where::CONDITION_AND,
        public string|\Stringable|array|null $fieldValue = null,
        public null|array|\Closure $generateValue = null,
    ) {
        $this->field = Attribute::handleArrayField($field);
        $this->fieldValue = Attribute::handleArrayField($fieldValue);
    }

    public function getValue(/* null|EntityInterface */ $entity = null) : mixed
    {
        if ($this->generateValue) {
            if ($entity) {
                return call_user_func_array($this->generateValue, [ $entity ]);
            }
            else {
                throw new \Exception(sprintf("Could not generate value from non-instanciated entity for field %s.", (string) $this->field));
            }
        }
        elseif ($this->fieldValue && $entity) {
            throw new \Exception(sprintf("Field value, from %s, could not be included in query since the entity is already loaded; it is meant to be used with a OneToOne relation loaded within a join.", (string) $this->fieldValue));
        }

        return $this->fieldValue ?? $this->value;
    }
}