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<?php

namespace Mautic\CoreBundle\Helper;

use Mautic\CoreBundle\Helper\ListParser\ArrayListParser;
use Mautic\CoreBundle\Helper\ListParser\BarListParser;
use Mautic\CoreBundle\Helper\ListParser\Exception\FormatNotSupportedException;
use Mautic\CoreBundle\Helper\ListParser\JsonListParser;
use Mautic\CoreBundle\Helper\ListParser\ListParserInterface;
use Mautic\CoreBundle\Helper\ListParser\ValueListParser;
use Mautic\CoreBundle\Translation\Translator;

abstract class AbstractFormFieldHelper
{
    /**
     * Json encoded format.
     */
    public const FORMAT_JSON = 'json';

    /**
     * Bar format value1|value2.
     */
    public const FORMAT_BAR = 'bar';

    /**
     * Simple value => label array.
     */
    public const FORMAT_SIMPLE_ARRAY = 'simple_array';

    /**
     * Array [['value' => 'value', 'label' => 'label'] ..].
     */
    public const FORMAT_ARRAY = 'array';

    /**
     * @var string
     */
    protected $translationKeyPrefix;

    /**
     * @var Translator
     */
    protected $translator;

    /**
     * @return mixed
     */
    abstract public function setTranslationKeyPrefix();

    /**
     * @return mixed
     */
    abstract public function getTypes();

    public function __construct()
    {
        $this->setTranslationKeyPrefix();
    }

    public function setTranslator(Translator $translator): void
    {
        $this->translator = $translator;
    }

    /**
     * @param array $customFields
     *
     * @return array
     */
    public function getChoiceList($customFields = [])
    {
        $choices = [];

        foreach ($this->getTypes() as $v => $type) {
            $choices[$this->translator->transConditional("mautic.core.type.{$v}", "{$this->translationKeyPrefix}{$v}")] = $v;
        }

        foreach ($customFields as $v => $f) {
            $choices[$this->translator->trans($f['label'])] = $v;
        }

        ksort($choices);

        return $choices;
    }

    /**
     * Format a string into an array.
     *
     * @param mixed $list                      List to parse
     * @param bool  $removeEmpty               @deprecated Kept for BC with method signature
     * @param bool  $deprecatedIgnoreNumerical @deprecated Flag was introduced to support boolean choice lists; use parseBooleanList instead
     *
     * @return array
     */
    public static function parseList($list, $removeEmpty = true, $deprecatedIgnoreNumerical = false)
    {
        if ($deprecatedIgnoreNumerical) {
            // BC support for support
            return static::parseBooleanList($list);
        }

        return static::parseChoiceList(
            self::parseListsWithParsers(
                $list,
                [
                    new JsonListParser(),
                    new BarListParser(),
                    new ValueListParser(),
                    new ArrayListParser(),
                ]
            )
        );
    }

    /**
     * Same as parseList method above but it will return labels as keys.
     *
     * @param mixed $list
     *
     * @return mixed[]
     */
    public static function parseListForChoices($list): array
    {
        return static::parseChoiceList(
            self::parseListsWithParsers(
                $list,
                [
                    new JsonListParser(),
                    new BarListParser(),
                    new ValueListParser(),
                    new ArrayListParser(),
                ]
            ),
            true
        );
    }

    /**
     * @param mixed $list
     *
     * @return mixed[]
     */
    public static function parseBooleanList($list): array
    {
        return static::parseChoiceList(
            self::parseListsWithParsers(
                $list,
                [
                    new JsonListParser(),
                    new BarListParser(),
                    new ValueListParser(),
                ]
            )
        );
    }

    /**
     * @return mixed[]|string
     */
    public static function formatList($format, $choices)
    {
        switch ($format) {
            case self::FORMAT_JSON:
                return json_encode($choices);
            case self::FORMAT_BAR:
                return implode('|', $choices);
            case self::FORMAT_SIMPLE_ARRAY:
                if (isset($choices[0]) && isset($choices[0]['label'])) {
                    $array = [];

                    foreach ($choices as $choice) {
                        $array[$choice['value']] = $choice['label'];
                    }

                    return $array;
                }

                return $choices;
            case self::FORMAT_ARRAY:
                $array = [];
                foreach ($choices as $value => $label) {
                    $array[] = [
                        'label' => $label,
                        'value' => $value,
                    ];
                }

                return $array;
        }
    }

    protected static function parseChoiceList(array $list, bool $labelsAsKeys = false)
    {
        $choices = [];
        foreach ($list as $value => $label) {
            if (is_array($label) && array_key_exists('value', $label)) {
                $value = $label['value'];
                $label = $label['label'];

                if ('' === $value || null === $value) {
                    // Value is empty which can't work as a key
                    continue;
                }

                $choices = self::appendChoice($choices, $label, $value, $labelsAsKeys);

                continue;
            }

            if (('' === $label || null === $label) && ('' === $value || null === $value)) {
                // Both label and value are empty which can't work as choices
                continue;
            }

            if (is_array($label)) {
                // Process the label as an array as this is likely an option group
                $key = trim(html_entity_decode($value, ENT_QUOTES));

                $choices[$key] = static::parseChoiceList($label);
                continue;
            }

            $choices = self::appendChoice($choices, $label, $value, $labelsAsKeys);
        }

        return $choices;
    }

    /**
     * @param mixed[] $choices
     *
     * @return mixed[]
     */
    private static function appendChoice(array $choices, string $label, string $value, bool $labelsAsKeys = false): array
    {
        $label = trim(html_entity_decode($label, ENT_QUOTES));
        $value = trim(html_entity_decode($value, ENT_QUOTES));

        if ($labelsAsKeys) {
            $choices[$label] = $value;
        } else {
            $choices[$value] = $label;
        }

        return $choices;
    }

    /**
     * @param mixed                 $list
     * @param ListParserInterface[] $parsers
     *
     * @return mixed[]
     */
    private static function parseListsWithParsers($list, array $parsers): array
    {
        foreach ($parsers as $parser) {
            try {
                $list = $parser->parse($list);
            } catch (FormatNotSupportedException) {
                continue;
            }
        }

        return $list;
    }
}