<?php

namespace App\Vito\Plugins\LiittleCookie\VitoTechnitiumDns\Services;

/**
 * Handles the mapping between Technitium's rData objects (type-specific fields)
 * and the flat content/priority format that Vito expects.
 *
 * Also handles encoding/decoding composite record IDs since Technitium
 * doesn't have a unique record ID — records are identified by domain + type + rData.
 */
class RecordMapper
{
    /**
     * Build a virtual record ID from the record's identifying fields.
     * Technitium has no numeric record IDs, so we encode the full identity.
     */
    public static function encodeRecordId(string $domain, string $type, array $rData): string
    {
        return base64_encode(json_encode([
            'domain' => $domain,
            'type' => $type,
            'rData' => $rData,
        ]));
    }

    /**
     * Decode a virtual record ID back into its components.
     *
     * @return array{domain: string, type: string, rData: array}
     */
    public static function decodeRecordId(string $recordId): array
    {
        $decoded = json_decode(base64_decode($recordId), true);

        if (! $decoded || ! isset($decoded['domain'], $decoded['type'], $decoded['rData'])) {
            throw new \InvalidArgumentException('Invalid record ID format');
        }

        return $decoded;
    }

    /**
     * Extract the human-readable "content" from Technitium's rData object.
     */
    public static function rDataToContent(string $type, array $rData): string
    {
        return match (strtoupper($type)) {
            'A', 'AAAA' => $rData['ipAddress'] ?? '',
            'CNAME' => $rData['cname'] ?? '',
            'MX' => $rData['exchange'] ?? '',
            'NS' => $rData['nameServer'] ?? '',
            'TXT' => $rData['text'] ?? '',
            'SRV' => $rData['target'] ?? '',
            'CAA' => sprintf('%d %s "%s"', $rData['flags'] ?? 0, $rData['tag'] ?? '', $rData['value'] ?? ''),
            'PTR' => $rData['ptrName'] ?? '',
            'SOA' => sprintf(
                '%s %s',
                $rData['primaryNameServer'] ?? '',
                $rData['responsiblePerson'] ?? '',
            ),
            default => json_encode($rData),
        };
    }

    /**
     * Extract the priority from rData, if applicable for this record type.
     */
    public static function rDataToPriority(string $type, array $rData): ?int
    {
        return match (strtoupper($type)) {
            'MX' => isset($rData['preference']) ? (int) $rData['preference'] : null,
            'SRV' => isset($rData['priority']) ? (int) $rData['priority'] : null,
            default => null,
        };
    }

    /**
     * Convert Vito's flat content/type into Technitium API parameters for add/update.
     */
    public static function contentToApiParams(string $type, string $content, ?int $priority = null): array
    {
        return match (strtoupper($type)) {
            'A', 'AAAA' => ['ipAddress' => $content],
            'CNAME' => ['cname' => $content],
            'MX' => array_filter([
                'exchange' => $content,
                'preference' => $priority ?? 10,
            ]),
            'NS' => ['nameServer' => $content],
            'TXT' => ['text' => $content],
            'SRV' => array_filter([
                'target' => $content,
                'priority' => $priority ?? 0,
                'weight' => 0,
                'port' => 0,
            ]),
            'CAA' => self::parseCaaContent($content),
            'PTR' => ['ptrName' => $content],
            default => [],
        };
    }

    /**
     * Build the "old" record parameters needed for a Technitium update call.
     * The API requires specifying the old values to identify which record to update.
     */
    public static function oldRecordParams(string $type, array $rData): array
    {
        $prefix = 'old';

        return match (strtoupper($type)) {
            'A', 'AAAA' => ["{$prefix}IpAddress" => $rData['ipAddress'] ?? ''],
            'CNAME' => ["{$prefix}Cname" => $rData['cname'] ?? ''],
            'MX' => [
                "{$prefix}Exchange" => $rData['exchange'] ?? '',
                "{$prefix}Preference" => $rData['preference'] ?? 10,
            ],
            'NS' => ["{$prefix}NameServer" => $rData['nameServer'] ?? ''],
            'TXT' => ["{$prefix}Text" => $rData['text'] ?? ''],
            'SRV' => [
                "{$prefix}Target" => $rData['target'] ?? '',
                "{$prefix}Priority" => $rData['priority'] ?? 0,
                "{$prefix}Weight" => $rData['weight'] ?? 0,
                "{$prefix}Port" => $rData['port'] ?? 0,
            ],
            'CAA' => [
                "{$prefix}Flags" => $rData['flags'] ?? 0,
                "{$prefix}Tag" => $rData['tag'] ?? '',
                "{$prefix}Value" => $rData['value'] ?? '',
            ],
            'PTR' => ["{$prefix}PtrName" => $rData['ptrName'] ?? ''],
            default => [],
        };
    }

    /**
     * Build the delete parameters from rData.
     * Technitium needs the record data to identify which record to delete.
     */
    public static function deleteParams(string $type, array $rData): array
    {
        return self::contentToApiParams(
            $type,
            self::rDataToContent($type, $rData),
            self::rDataToPriority($type, $rData),
        );
    }

    /**
     * Parse a CAA record content string like: 0 issue "letsencrypt.org"
     */
    private static function parseCaaContent(string $content): array
    {
        if (preg_match('/^(\d+)\s+(\S+)\s+"?([^"]*)"?$/', $content, $matches)) {
            return [
                'flags' => (int) $matches[1],
                'tag' => $matches[2],
                'value' => $matches[3],
            ];
        }

        return ['flags' => 0, 'tag' => 'issue', 'value' => $content];
    }
}