<?php

namespace Nette\Schema;

use Nette;

/**
 * Schema validator.
 */
final class Processor
{
    use Nette\SmartObject;

    /** @var array */
    public $onNewContext = [];

    /** @var Context|null */
    private $context;

    /** @var bool */
    private $skipDefaults;

    public function skipDefaults(bool $value = true)
    {
        $this->skipDefaults = $value;
    }

    /**
     * Normalizes and validates data. Result is a clean completed data.
     * @return mixed
     * @throws ValidationException
     */
    public function process(Schema $schema, $data)
    {
        $this->createContext();
        $data = $schema->normalize($data, $this->context);
        $this->throwsErrors();
        $data = $schema->complete($data, $this->context);
        $this->throwsErrors();
        return $data;
    }

    /**
     * Normalizes and validates and merges multiple data. Result is a clean completed data.
     * @return mixed
     * @throws ValidationException
     */
    public function processMultiple(Schema $schema, array $dataset)
    {
        $this->createContext();
        $flatten = null;
        $first = true;
        foreach ($dataset as $data) {
            $data = $schema->normalize($data, $this->context);
            $this->throwsErrors();
            $flatten = $first ? $data : $schema->merge($data, $flatten);
            $first = false;
        }

        $data = $schema->complete($flatten, $this->context);
        $this->throwsErrors();
        return $data;
    }

    /**
     * @return string[]
     */
    public function getWarnings(): array
    {
        $res = [];
        foreach ($this->context->warnings as $message) {
            $res[] = $message->toString();
        }

        return $res;
    }

    private function throwsErrors(): void
    {
        if ($this->context->errors) {
            throw new ValidationException(null, $this->context->errors);
        }
    }

    private function createContext()
    {
        $this->context = new Context;
        $this->context->skipDefaults = $this->skipDefaults;
        $this->onNewContext($this->context);
    }
}
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