<?php

declare(strict_types=1);

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

namespace TYPO3\CMS\Extbase\Validation\Validator;

use Psr\Http\Message\ServerRequestInterface;
use TYPO3\CMS\Core\Http\UploadedFile;
use TYPO3\CMS\Core\Type\File\FileInfo;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Extbase\Error\Result;
use TYPO3\CMS\Extbase\Persistence\ObjectStorage;
use TYPO3\CMS\Extbase\Utility\LocalizationUtility;
use TYPO3\CMS\Extbase\Validation\Error;
use TYPO3\CMS\Extbase\Validation\Exception\InvalidValidationOptionsException;

/**
 * Abstract validator. Mother af most validators.
 */
abstract class AbstractValidator implements ValidatorInterface
{
    /**
     * Specifies whether this validator accepts empty values.
     *
     * If this is TRUE, the validators isValid() method is not called in case of an empty value
     * Note: A value is considered empty if it is NULL or an empty string!
     * By default, all validators except for NotEmpty and the Composite Validators accept empty values.
     *
     * @var bool
     */
    protected $acceptsEmptyValues = true;

    /**
     * Contains an array of property names used for translation handling of error messages.
     */
    protected array $translationOptions = ['message'];

    /**
     * This contains the supported options, their default values, types and descriptions.
     *
     * @var array
     */
    protected $supportedOptions = [];

    protected array $options = [];
    protected Result $result;
    protected ?ServerRequestInterface $request = null;

    public function setOptions(array $options): void
    {
        $this->initializeDefaultOptions($options);
        $this->initializeTranslationOptions($options);
    }

    /**
     * @todo: Add to ValidatorInterface in TYPO3 v14
     */
    public function setRequest(?ServerRequestInterface $request): void
    {
        $this->request = $request;
    }

    /**
     * Checks if the given value is valid according to the validator, and returns
     * the error messages object which occurred.
     *
     * @param mixed $value The value that should be validated
     */
    public function validate(mixed $value): Result
    {
        $this->result = new Result();
        if ($this->acceptsEmptyValues === false || $this->isEmpty($value) === false) {
            $this->isValid($value);
        }
        return $this->result;
    }

    /**
     * Check if $value is valid. If it is not valid, needs to add an error to result.
     */
    abstract protected function isValid(mixed $value): void;

    /**
     * Creates a new validation error object and adds it to $this->result
     *
     * @param string $message The error message
     * @param int $code The error code (a unix timestamp)
     * @param array $arguments Arguments to be replaced in message
     * @param string $title title of the error
     */
    protected function addError(string $message, int $code, array $arguments = [], string $title = ''): void
    {
        $this->result->addError(new Error($message, $code, $arguments, $title));
    }

    /**
     * Creates a new validation error object for a property and adds it to the proper sub result of $this->result
     *
     * @param string|array $propertyPath The property path (string or array)
     * @param string $message The error message
     * @param int $code The error code (a unix timestamp)
     * @param array $arguments Arguments to be replaced in message
     * @param string $title Title of the error
     */
    protected function addErrorForProperty(string|array $propertyPath, string $message, int $code, array $arguments = [], string $title = ''): void
    {
        $propertyPath = is_array($propertyPath) ? implode('.', $propertyPath) : $propertyPath;
        $error = new Error($message, $code, $arguments, $title);
        $this->result->forProperty($propertyPath)->addError($error);
    }

    /**
     * Returns the options of this validator
     */
    public function getOptions(): array
    {
        return $this->options;
    }

    /**
     * @todo: Add to ValidatorInterface in TYPO3 v14
     */
    public function getRequest(): ?ServerRequestInterface
    {
        return $this->request;
    }

    /**
     * TRUE if the given $value is NULL or an empty string ('')
     */
    final protected function isEmpty(mixed $value): bool
    {
        return $value === null || $value === '';
    }

    /**
     * Translates an error message using LocalizationUtility::translate() method. If the translate key does not
     * start with 'LLL:' and if no extension name is provided, the original translate key is returned.
     */
    protected function translateErrorMessage(
        string $translateKey,
        string $extensionName = '',
        array $arguments = []
    ): string {
        if ($extensionName === '' && !str_starts_with($translateKey, 'LLL:')) {
            return $translateKey;
        }

        return LocalizationUtility::translate(
            $translateKey,
            $extensionName,
            $arguments
        ) ?? '';
    }

    /**
     * Initialize default options.
     * @throws InvalidValidationOptionsException
     */
    protected function initializeDefaultOptions(array $options): void
    {
        // check for options given but not supported
        if (($unsupportedOptions = array_diff_key($options, $this->supportedOptions)) !== []) {
            throw new InvalidValidationOptionsException('Unsupported validation option(s) found: ' . implode(', ', array_keys($unsupportedOptions)), 1379981890);
        }
        // check for required options being set
        array_walk(
            $this->supportedOptions,
            static function (array $supportedOptionData, string $supportedOptionName, array $options): void {
                if (isset($supportedOptionData[3]) && $supportedOptionData[3] === true && !array_key_exists($supportedOptionName, $options)) {
                    throw new InvalidValidationOptionsException('Required validation option not set: ' . $supportedOptionName, 1379981891);
                }
            },
            $options
        );
        // merge with default values
        $this->options = array_merge(
            array_map(
                static fn(array $value): mixed => $value[0],
                $this->supportedOptions
            ),
            $options
        );
    }

    /**
     * Ensures that the provided value is either an instance of UploadedFile or an ObjectStorage containing only
     * UploadedFile instances.
     */
    protected function ensureFileUploadTypes(mixed $value): void
    {
        if ($value instanceof UploadedFile) {
            return;
        }

        if ($value instanceof ObjectStorage) {
            foreach ($value as $uploadedFile) {
                if (!$uploadedFile instanceof UploadedFile) {
                    throw new \InvalidArgumentException('Value to validate must be an ObjectStorage of TYPO3\\CMS\\Core\\Http\\UploadedFile', 1722763902);
                }
            }
            return;
        }

        throw new \InvalidArgumentException('Value to validate must be a TYPO3\\CMS\\Core\\Http\\UploadedFile', 1712057926);
    }

    protected function getFileInfo(string $filePath): FileInfo
    {
        return GeneralUtility::makeInstance(FileInfo::class, $filePath);
    }

    /**
     * Initializes all registered translation options with custom translation options from the given options array
     */
    protected function initializeTranslationOptions(array $options): void
    {
        foreach ($this->translationOptions as $translationOption) {
            if (property_exists($this, $translationOption)) {
                $this->$translationOption = $options[$translationOption] ?? $this->$translationOption;
            }
        }
    }
}