<?php

namespace App\Services;

use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Validator;
use Illuminate\Validation\ValidationException;

class SiteConfigurationService
{
    public function get(): array
    {
        return DB::transaction(fn () => $this->format(DB::table('site_settings')->where('id', 1)->sharedLock()->first()));
    }

    public function save(array $input): array
    {
        $data = Validator::make($input, [
            'translations' => ['present', 'array:zh,en,vi'],
            'translations.*' => ['array:content'],
            'translations.*.content' => ['nullable', 'string', 'max:2000'],
            'domains' => ['present', 'array', 'max:100'],
            'domains.*' => ['required', 'string', 'max:2048'],
        ], [
            'translations.present' => '请提交三语言跑马灯内容', 'translations.array' => '跑马灯仅支持zh/en/vi三种语言',
            'translations.*.array' => '每种语言请提交content对象', 'translations.*.content.string' => '跑马灯内容必须为文本',
            'translations.*.content.max' => '每种语言的跑马灯最多2000个字符',
            'domains.present' => '请提交域名数组', 'domains.array' => '域名必须为数组', 'domains.max' => '域名最多100个',
            'domains.*.required' => '域名不能为空', 'domains.*.string' => '每个域名必须为字符串', 'domains.*.max' => '每个域名最多2048个字符',
        ])->validate();
        if (array_values($data['domains']) !== $data['domains']) {
            throw ValidationException::withMessages(['domains' => '域名必须为顺序数组']);
        }
        $domains = [];
        foreach ($data['domains'] as $index => $domain) {
            $url = $this->domain($domain, $index);
            if (!in_array($url, $domains, true)) $domains[] = $url;
        }
        $translations = [];
        foreach (['zh', 'en', 'vi'] as $language) $translations[$language] = ['content' => trim((string) ($data['translations'][$language]['content'] ?? ''))];
        $payload = ['translations' => $translations, 'domains' => $domains];
        return DB::transaction(function () use ($payload) {
            DB::table('site_settings')->insertOrIgnore(['id' => 1, 'domains' => '[]', 'created_at' => now(), 'updated_at' => now()]);
            $before = $this->format(DB::table('site_settings')->where('id', 1)->lockForUpdate()->first());
            if ($before !== $payload) {
                DB::table('site_settings')->where('id', 1)->update([
                    'domains' => json_encode($payload['domains'], JSON_UNESCAPED_SLASHES | JSON_THROW_ON_ERROR), 'updated_at' => now()]);
                DB::table('site_setting_translations')->where('site_setting_id', 1)->delete();
                foreach ($payload['translations'] as $language => $text) {
                    if ($text['content'] !== '') DB::table('site_setting_translations')->insert([
                        'site_setting_id' => 1, 'language' => $language, 'content' => $text['content']]);
                }
                OperationAuditService::record('site_configuration', 1, 'update', $before, $payload);
            }
            return $payload;
        }, 3);
    }

    private function format(?object $row): array
    {
        $domains = $row ? json_decode($row->domains, true, 512, JSON_THROW_ON_ERROR) : [];
        if (!is_array($domains) || array_values($domains) !== $domains || count(array_filter($domains, 'is_string')) !== count($domains)) {
            throw new \RuntimeException('站点域名配置格式异常');
        }
        $translations = ['zh' => ['content' => ''], 'en' => ['content' => ''], 'vi' => ['content' => '']];
        if ($row) foreach (DB::table('site_setting_translations')->where('site_setting_id', 1)->get(['language', 'content']) as $text) {
            if (isset($translations[$text->language])) $translations[$text->language] = ['content' => (string) $text->content];
        }
        return ['translations' => $translations, 'domains' => $domains];
    }

    private function domain(string $value, int $index): string
    {
        $url = trim($value);
        if (!preg_match('~^[a-z][a-z0-9+.-]*://~i', $url)) $url = 'https://' . $url;
        $parts = parse_url($url);
        if (!filter_var($url, FILTER_VALIDATE_URL) || !$parts
            || !in_array(strtolower($parts['scheme'] ?? ''), ['http', 'https'], true)
            || empty($parts['host']) || isset($parts['user']) || isset($parts['pass'])
            || isset($parts['query']) || isset($parts['fragment'])
            || !in_array($parts['path'] ?? '', ['', '/'], true)
            || (isset($parts['port']) && $parts['port'] < 1)) {
            throw ValidationException::withMessages(['domains.' . $index => '域名仅支持HTTP/HTTPS站点地址，不带账号、路径、查询参数或片段']);
        }
        return strtolower($parts['scheme']) . '://' . strtolower($parts['host']) . (isset($parts['port']) ? ':' . $parts['port'] : '');
    }
}