<?php

namespace App\Services;

use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Str;

class ClaudeCodeNewsService
{
    private const CACHE_KEY = 'claude_code_releases';

    private const CACHE_TTL = 3600; // 1시간

    private const API_URL = 'https://api.github.com/repos/anthropics/claude-code/releases';

    /**
     * GitHub Releases 목록 조회 (캐싱, 한국어 번역 포함)
     */
    public function getReleases(int $perPage = 20): array
    {
        return Cache::remember(self::CACHE_KEY, self::CACHE_TTL, function () use ($perPage) {
            return $this->fetchFromGitHub($perPage);
        });
    }

    /**
     * 캐시 클리어
     */
    public function clearCache(): void
    {
        Cache::forget(self::CACHE_KEY);
    }

    /**
     * GitHub API에서 릴리즈 정보 가져오기 + 한국어 번역
     */
    private function fetchFromGitHub(int $perPage): array
    {
        try {
            $response = Http::withHeaders([
                'Accept' => 'application/vnd.github.v3+json',
                'User-Agent' => 'SAM-MNG-App',
            ])->timeout(10)->get(self::API_URL, [
                'per_page' => $perPage,
            ]);

            if (! $response->successful()) {
                return [];
            }

            return collect($response->json())
                ->map(function ($release) {
                    $body = $release['body'] ?? '';
                    $bodyKo = $this->translateToKorean($body);

                    return [
                        'id' => $release['id'],
                        'tag_name' => $release['tag_name'],
                        'name' => $release['name'] ?? $release['tag_name'],
                        'body_html' => Str::markdown($body),
                        'body_html_ko' => Str::markdown($bodyKo),
                        'published_at' => $release['published_at'],
                        'author' => $release['author']['login'] ?? 'unknown',
                        'author_avatar' => $release['author']['avatar_url'] ?? '',
                        'html_url' => $release['html_url'],
                        'prerelease' => $release['prerelease'] ?? false,
                        'draft' => $release['draft'] ?? false,
                    ];
                })
                ->toArray();
        } catch (\Exception $e) {
            report($e);

            return [];
        }
    }

    /**
     * 영문 마크다운을 한국어로 번역 (코드 블록 보호)
     */
    private function translateToKorean(string $text): string
    {
        if (empty(trim($text))) {
            return '';
        }

        // 코드 블록/인라인 코드를 플레이스홀더로 보호
        $protected = [];
        $safe = preg_replace_callback('/```[\s\S]*?```|`[^`\n]+`/', function ($match) use (&$protected) {
            $key = 'ZXCBLK'.count($protected).'QWE';
            $protected[$key] = $match[0];

            return $key;
        }, $text);

        // 번역
        if (mb_strlen($safe) <= 4000) {
            $translated = $this->callGoogleTranslate($safe);
        } else {
            $translated = $this->translateLongText($safe);
        }

        // 코드 블록 복원
        foreach ($protected as $key => $code) {
            $translated = str_replace($key, $code, $translated);
        }

        return $translated;
    }

    /**
     * 긴 텍스트를 단락 단위로 분할 번역
     */
    private function translateLongText(string $text): string
    {
        $parts = preg_split('/(\n\n+)/', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
        $chunks = [];
        $current = '';

        foreach ($parts as $part) {
            if (mb_strlen($current.$part) > 4000 && $current !== '') {
                $chunks[] = $current;
                $current = $part;
            } else {
                $current .= $part;
            }
        }
        if ($current !== '') {
            $chunks[] = $current;
        }

        $result = '';
        foreach ($chunks as $chunk) {
            $result .= $this->callGoogleTranslate($chunk);
        }

        return $result;
    }

    /**
     * Google Translate API 호출
     */
    private function callGoogleTranslate(string $text): string
    {
        try {
            $response = Http::timeout(5)
                ->get('https://translate.googleapis.com/translate_a/single', [
                    'client' => 'gtx',
                    'sl' => 'en',
                    'tl' => 'ko',
                    'dt' => 't',
                    'q' => $text,
                ]);

            if (! $response->successful()) {
                return $text;
            }

            $result = $response->json();
            $translated = '';

            if (is_array($result) && isset($result[0]) && is_array($result[0])) {
                foreach ($result[0] as $segment) {
                    if (is_array($segment) && isset($segment[0])) {
                        $translated .= $segment[0];
                    }
                }
            }

            return $translated !== '' ? $translated : $text;
        } catch (\Exception $e) {
            return $text;
        }
    }
}