<?php

namespace App\Services\Admin\Log;

use App\Repositories\Admin\Log\MemberPasswdModifyLogRepository;

final class MemberPasswdModifyLogService
{
    public function __construct(
        private readonly MemberPasswdModifyLogRepository $repo,
    ) {}

    public function indexData(array $query = []): array
    {
        $filters = [
            'date_from' => $this->safeDate($query['date_from'] ?? ''),
            'date_to'   => $this->safeDate($query['date_to'] ?? ''),

            'state'     => $this->safeEnum($query['state'] ?? '', ['S','E']),  // S 직접, E 찾기
            'mem_no'    => $this->safeInt($query['mem_no'] ?? null),

            'type'      => $this->safeStr($query['type'] ?? '', 40),          // 신포맷 type
            'email'     => $this->safeStr($query['email'] ?? '', 80),         // 구포맷 user_email
            'ip'        => $this->safeIpPrefix($query['ip'] ?? ''),           // remote_addr or auth_key contains
            'q'         => $this->safeStr($query['q'] ?? '', 120),            // info 전체 like
        ];

        if ($filters['date_from'] && $filters['date_to']) {
            if (strcmp($filters['date_from'], $filters['date_to']) > 0) {
                [$filters['date_from'], $filters['date_to']] = [$filters['date_to'], $filters['date_from']];
            }
        }

        $page = $this->repo->paginate($filters, 30);

        $items = [];
        foreach ($page->items() as $it) {
            $r = is_array($it) ? $it : (array)$it;

            $infoRaw = (string)($r['info'] ?? '');
            $infoArr = $this->decodeJson($infoRaw);

            $state = (string)($r['state'] ?? '');
            $memNo = (int)($infoArr['mem_no'] ?? 0);

            $type = trim((string)($infoArr['type'] ?? ''));
            $eventType = $type !== '' ? $type : ($state === 'E' ? '비밀번호찾기 변경' : '비밀번호변경');

            $eventTime = trim((string)($infoArr['redate'] ?? ''));
            if ($eventTime === '') $eventTime = (string)($r['rgdate'] ?? '');

            $ip = trim((string)($infoArr['remote_addr'] ?? ''));
            if ($ip === '') {
                $ip = $this->extractIpFromAuthKey((string)($infoArr['auth_key'] ?? '')) ?: '';
            }

            $email = trim((string)($infoArr['user_email'] ?? ''));
            if ($email === '') $email = trim((string)($infoArr['email'] ?? ''));

            $agent = trim((string)($infoArr['agent'] ?? ''));

            $items[] = array_merge($r, [
                'info_arr' => $infoArr,

                'mem_no_int' => $memNo,
                'mem_link'   => $memNo > 0 ? ('/members/' . $memNo) : null,

                'state_label' => $state === 'E' ? '비번찾기' : '직접변경',
                'state_badge' => $state === 'E' ? 'badge--warn' : 'badge--ok',

                'event_type' => $eventType,
                'event_time' => $eventTime,

                'ip_norm'    => $ip,
                'email_norm' => $email,
                'agent_norm' => $agent,

                // 펼침용(구포맷 핵심 필드)
                'auth_key' => (string)($infoArr['auth_key'] ?? ''),
                'auth_effective_time' => (string)($infoArr['auth_effective_time'] ?? ''),

                // raw pretty
                'info_pretty' => $this->prettyJson($infoArr, $infoRaw),
            ]);
        }

        return [
            'filters' => $filters,
            'page'    => $page,
            'items'   => $items,

            'stateMap' => [
                'S' => '직접변경',
                'E' => '비번찾기',
            ],
        ];
    }

    private function decodeJson(string $raw): array
    {
        $raw = trim($raw);
        if ($raw === '') return [];
        $arr = json_decode($raw, true);
        return is_array($arr) ? $arr : [];
    }

    private function prettyJson(array $arr, string $fallbackRaw): string
    {
        if (!empty($arr)) {
            return (string)json_encode($arr, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        }
        return $fallbackRaw;
    }

    private function extractIpFromAuthKey(string $authKey): ?string
    {
        $authKey = trim($authKey);
        if ($authKey === '') return null;

        // auth_key 끝에 "1.85.101.111" 같은 IP가 붙는 케이스 대응 (마지막 매치 사용)
        if (preg_match_all('/(\d{1,3}(?:\.\d{1,3}){3})/', $authKey, $m) && !empty($m[1])) {
            return (string)end($m[1]);
        }
        return null;
    }

    private function safeStr(mixed $v, int $max): string
    {
        $s = trim((string)$v);
        if ($s === '') return '';
        if (mb_strlen($s) > $max) $s = mb_substr($s, 0, $max);
        return $s;
    }

    private function safeEnum(mixed $v, array $allowed): string
    {
        $s = trim((string)$v);
        return in_array($s, $allowed, true) ? $s : '';
    }

    private function safeInt(mixed $v): ?int
    {
        if ($v === null || $v === '') return null;
        if (!is_numeric($v)) return null;
        $n = (int)$v;
        return $n >= 0 ? $n : null;
    }

    private function safeDate(mixed $v): ?string
    {
        $s = trim((string)$v);
        if ($s === '') return null;
        return preg_match('/^\d{4}-\d{2}-\d{2}$/', $s) ? $s : null;
    }

    private function safeIpPrefix(mixed $v): string
    {
        $s = trim((string)$v);
        if ($s === '') return '';
        return preg_match('/^[0-9.]+$/', $s) ? $s : '';
    }
}