<?php

namespace App\Services\Admin\Log;

use App\Repositories\Admin\Log\MemberLoginLogRepository;
use Illuminate\Support\Facades\Schema;

final class MemberLoginLogService
{
    public function __construct(
        private readonly MemberLoginLogRepository $repo,
    ) {}

    public function indexData(array $query = []): array
    {
        $currentYear = (int)date('Y');
        $years = $this->availableYears(2018, $currentYear);

        $year = (int)($query['year'] ?? $currentYear);
        if (!in_array($year, $years, true)) {
            // 테이블 없거나 허용 범위 밖이면 최신년도 fallback
            $year = !empty($years) ? max($years) : $currentYear;
        }

        $filters = [
            'year'      => $year,
            'date_from' => $this->safeDate($query['date_from'] ?? ''),
            'date_to'   => $this->safeDate($query['date_to'] ?? ''),

            'mem_no'    => $this->safeInt($query['mem_no'] ?? null),

            'sf'        => $this->safeEnum($query['sf'] ?? '', ['s','f']), // 성공/실패
            'conn'      => $this->safeEnum($query['conn'] ?? '', ['1','2']), // pc/mobile

            'ip4'       => $this->safeIpPrefix($query['ip4'] ?? ''),
            'ip4_c'     => $this->safeIpPrefix($query['ip4_c'] ?? ''),

            'error_code'=> $this->safeStr($query['error_code'] ?? '', 10),

            'platform'  => $this->safeStr($query['platform'] ?? '', 30),
            'browser'   => $this->safeStr($query['browser'] ?? '', 40),
        ];

        // 기간 역전 방지
        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 = $this->repo->paginateByYear($year, $filters, 30);

        // 화면 가공(라벨/링크 등)
        $items = [];
        foreach ($page->items() as $it) {
            $r = is_array($it) ? $it : (array)$it;

            $sf = (string)($r['sf'] ?? 's');
            $conn = (string)($r['conn'] ?? '1');

            $items[] = array_merge($r, [
                'sf_label' => $sf === 'f' ? '실패' : '성공',
                'sf_badge' => $sf === 'f' ? 'badge--bad' : 'badge--ok',

                'conn_label' => $conn === '2' ? 'M' : 'PC',
                'conn_badge' => $conn === '2' ? 'badge--mvno' : 'badge--muted',

                'mem_no_int' => (int)($r['mem_no'] ?? 0),
                'mem_link'   => ((int)($r['mem_no'] ?? 0) > 0) ? ('/members/' . (int)$r['mem_no']) : null,

                // 실패가 아니면 에러코드 화면에서 비워도 됨(뷰에서 처리)
            ]);
        }

        return [
            'years'   => $years,
            'filters' => $filters,
            'page'    => $page,
            'items'   => $items,
        ];
    }

    private function availableYears(int $from, int $to): array
    {
        $out = [];
        for ($y = $from; $y <= $to; $y++) {
            $t = 'mem_login_' . $y;
            if (Schema::hasTable($t)) $out[] = $y;
        }
        // 없으면 그냥 범위라도 반환(운영/개발에서 초기 셋업 대비)
        return !empty($out) ? $out : [$to];
    }

    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 : '';
    }
}