<?php

declare(strict_types=1);

namespace JsonSchema;

/**
 * @method static DraftIdentifiers DRAFT_3()
 * @method static DraftIdentifiers DRAFT_4()
 * @method static DraftIdentifiers DRAFT_6()
 * @method static DraftIdentifiers DRAFT_7()
 * @method static DraftIdentifiers DRAFT_2019_09()
 * @method static DraftIdentifiers DRAFT_2020_12()
 */
class DraftIdentifiers extends Enum
{
    public const DRAFT_3 = 'http://json-schema.org/draft-03/schema#';
    public const DRAFT_4 = 'http://json-schema.org/draft-04/schema#';
    public const DRAFT_6 = 'http://json-schema.org/draft-06/schema#';
    public const DRAFT_7 = 'http://json-schema.org/draft-07/schema#';
    public const DRAFT_2019_09 = 'https://json-schema.org/draft/2019-09/schema';
    public const DRAFT_2020_12 = 'https://json-schema.org/draft/2020-12/schema';

    /** @var array<DraftIdentifiers::DRAFT_*, string> */
    private const MAPPING = [
        self::DRAFT_3 => 'draft03',
        self::DRAFT_4 => 'draft04',
        self::DRAFT_6 => 'draft06',
        self::DRAFT_7 => 'draft07',
        self::DRAFT_2019_09 => 'draft2019-09',
        self::DRAFT_2020_12 => 'draft2020-12',
    ];

    private const FALLBACK_MAPPING = [
        'draft3' => self::DRAFT_3,
        'draft4' => self::DRAFT_4,
        'draft6' => self::DRAFT_6,
        'draft7' => self::DRAFT_7,
    ];

    public function toConstraintName(): string
    {
        return self::MAPPING[$this->getValue()];
    }

    public static function fromConstraintName(string $name): DraftIdentifiers
    {
        $reverseMap = array_flip(self::MAPPING);
        if (!array_key_exists($name, $reverseMap)) {
            if (array_key_exists($name, self::FALLBACK_MAPPING)) {
                return DraftIdentifiers::byValue(self::FALLBACK_MAPPING[$name]);
            }
            throw new \InvalidArgumentException("$name is not a valid constraint name.");
        }

        return DraftIdentifiers::byValue($reverseMap[$name]);
    }

    public function withoutFragment(): string
    {
        return rtrim($this->getValue(), '#');
    }
}