<?php

declare(strict_types=1);
namespace App\Services\Freenode;

use App\Models\CrawlFreenode;
use App\Models\SiteMap;
use RuntimeException;

final class Pipeline
{
    public static function enabled(): bool { return config('freenode.engine', 'legacy') === 'v2'; }

    public static function store(): ReleaseStore
    {
        return new ReleaseStore(storage_path('app/freenode-v2'), public_path('freenode/merge'));
    }

    public static function prepare(): array
    {
        $sources = [];
        $cycle = strtotime(date('Y-m-d').' '.sprintf('%02d', intdiv((int) date('H'), 6) * 6).':00:00');
        foreach (CrawlFreenode::where('status', 1)->get() as $source) {
            if (!preg_match('/^[a-zA-Z0-9_-]+$/D', $source->name)) throw new RuntimeException('invalid_source_name');
            $row = ['name' => $source->name];
            foreach (json_decode($source->file_real ?? '[]', true, 512, JSON_THROW_ON_ERROR) as $format => $file) {
                if (!in_array($format, ['v2ray', 'clash'], true)) continue;
                if (!preg_match('/^'.date('Ymd').'-(v2ray\.txt|clash\.yaml)$/D', $file)) throw new RuntimeException('stale_source_date:'.$source->name);
                $path = public_path('freenode/from/'.$source->name.'/'.$file);
                if (!is_file($path) || filemtime($path) < $cycle) throw new RuntimeException('stale_source_cycle:'.$source->name);
                $row[$format] = file_get_contents($path);
            }
            if (!isset($row['v2ray'], $row['clash'])) throw new RuntimeException('incomplete_source:'.$source->name);
            $sources[] = $row;
        }
        $sites = [];
        foreach (SiteMap::whereIn('group_code', ['fn_a', 'fn_b'])->where('status', 1)->get() as $site) {
            $config = json_decode($site->config ?? '[]', true, 512, JSON_THROW_ON_ERROR);
            $sites[] = ['code' => $site->code, 'clients' => $config['freenode_client'] ?? []];
        }
        if (!$sources || !$sites) throw new RuntimeException('no_enabled_sources_or_sites');
        $sites[] = ['code' => '_admin', 'clients' => ['v2ray', 'clash', 'singbox']];
        $clashTemplate = \Symfony\Component\Yaml\Yaml::parseFile(public_path('freenode/template/clash.txt'));
        $validator = new NativeValidator(config('freenode.singbox_binary'), config('freenode.mihomo_binary'), $clashTemplate);
        $result = (new Builder())->build($sources, $sites, $validator);
        return self::store()->stage($result, date('Y-m-d'), (float) config('freenode.minimum_ratio', 0.5));
    }
}