<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */

declare(strict_types=1);

namespace Nette\Schema\Elements;

use Nette;
use Nette\Schema\Context;
use Nette\Schema\Helpers;
use Nette\Schema\Schema;


final class AnyOf implements Schema
{
    use Base;

    private array $set;


    public function __construct(mixed ...$set)
    {
        if (!$set) {
            throw new Nette\InvalidStateException('The enumeration must not be empty.');
        }

        $this->set = $set;
    }


    public function firstIsDefault(): self
    {
        $this->default = $this->set[0];
        return $this;
    }


    public function nullable(): self
    {
        $this->set[] = null;
        return $this;
    }


    public function dynamic(): self
    {
        $this->set[] = new Type(Nette\Schema\DynamicParameter::class);
        return $this;
    }


    /********************* processing ****************d*g**/


    public function normalize(mixed $value, Context $context): mixed
    {
        return $this->doNormalize($value, $context);
    }


    public function merge(mixed $value, mixed $base): mixed
    {
        if (is_array($value) && isset($value[Helpers::PreventMerging])) {
            unset($value[Helpers::PreventMerging]);
            return $value;
        }

        return Helpers::merge($value, $base);
    }


    public function complete(mixed $value, Context $context): mixed
    {
        $isOk = $context->createChecker();
        $value = $this->findAlternative($value, $context);
        $isOk() && $value = $this->doTransform($value, $context);
        return $isOk() ? $value : null;
    }


    private function findAlternative(mixed $value, Context $context): mixed
    {
        $expecteds = $innerErrors = [];
        foreach ($this->set as $item) {
            if ($item instanceof Schema) {
                $dolly = new Context;
                $dolly->path = $context->path;
                $res = $item->complete($item->normalize($value, $dolly), $dolly);
                if (!$dolly->errors) {
                    $context->warnings = array_merge($context->warnings, $dolly->warnings);
                    return $res;
                }

                foreach ($dolly->errors as $error) {
                    if ($error->path !== $context->path || empty($error->variables['expected'])) {
                        $innerErrors[] = $error;
                    } else {
                        $expecteds[] = $error->variables['expected'];
                    }
                }
            } else {
                if ($item === $value) {
                    return $value;
                }

                $expecteds[] = Nette\Schema\Helpers::formatValue($item);
            }
        }

        if ($innerErrors) {
            $context->errors = array_merge($context->errors, $innerErrors);
        } else {
            $context->addError(
                'The %label% %path% expects to be %expected%, %value% given.',
                Nette\Schema\Message::TypeMismatch,
                [
                    'value' => $value,
                    'expected' => implode('|', array_unique($expecteds)),
                ],
            );
        }

        return null;
    }


    public function completeDefault(Context $context): mixed
    {
        if ($this->required) {
            $context->addError(
                'The mandatory item %path% is missing.',
                Nette\Schema\Message::MissingItem,
            );
            return null;
        }

        if ($this->default instanceof Schema) {
            return $this->default->completeDefault($context);
        }

        return $this->default;
    }
}

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