<?php

namespace App\Services\Publishing;

use App\Enums\PlatformEnum;
use App\Exceptions\PublishException;
use App\Models\Article;
use App\Models\ArticlePublication;
use App\Models\Keyword;
use App\Models\PlatformChannel;
use App\Models\PlatformChannelPost;
use App\Models\Route;
use App\Models\RouteArticle;
use App\Modules\Lemmy\Services\LemmyPublisher;
use App\Services\Log\LogSaver;
use Exception;
use Illuminate\Support\Collection;
use RuntimeException;

class ArticlePublishingService
{
    public function __construct(private LogSaver $logSaver) {}

    /**
     * Factory seam to create publisher instances (helps testing without network calls)
     */
    protected function makePublisher(mixed $account): LemmyPublisher
    {
        return new LemmyPublisher($account);
    }

    /**
     * Publish an article to the channel specified by a route_article record.
     *
     * @param  array<string, mixed>  $extractedData
     *
     * @throws PublishException
     */
    public function publishRouteArticle(RouteArticle $routeArticle, array $extractedData): ?ArticlePublication
    {
        $article = $routeArticle->article;
        $channel = $routeArticle->platformChannel;

        if (! $channel) {
            throw new PublishException($article, PlatformEnum::LEMMY, new RuntimeException('ROUTE_ARTICLE_MISSING_CHANNEL'));
        }

        if (! $channel->relationLoaded('platformInstance')) {
            $channel->load(['platformInstance', 'activePlatformAccounts']);
        }

        $account = $channel->activePlatformAccounts()->first();

        if (! $account) {
            $this->logSaver->warning('No active account for channel', $channel, [
                'article_id' => $article->id,
                'route_article_id' => $routeArticle->id,
            ]);

            return null;
        }

        return $this->publishToChannel($article, $extractedData, $channel, $account);
    }

    /**
     * @deprecated Use publishRouteArticle() instead. Kept for PublishApprovedArticleListener compatibility.
     *
     * @param  array<string, mixed>  $extractedData
     * @return Collection<int, ArticlePublication>
     *
     * @throws PublishException
     */
    public function publishToRoutedChannels(Article $article, array $extractedData): Collection
    {
        $feed = $article->feed;

        $activeRoutes = Route::where('feed_id', $feed->id)
            ->where('is_active', true)
            ->get();

        $keywordsByChannel = Keyword::where('feed_id', $feed->id)
            ->where('is_active', true)
            ->get()
            ->groupBy('platform_channel_id');

        $matchingRoutes = $activeRoutes->filter(function (Route $route) use ($extractedData, $keywordsByChannel) {
            $keywords = $keywordsByChannel->get($route->platform_channel_id, collect());
            if ($keywords->isEmpty()) {
                return true;
            }

            $articleContent = ($extractedData['full_article'] ?? '').
                ' '.($extractedData['title'] ?? '').
                ' '.($extractedData['description'] ?? '');

            foreach ($keywords as $keyword) {
                if (stripos($articleContent, $keyword->keyword) !== false) {
                    return true;
                }
            }

            return false;
        });

        return $matchingRoutes->map(function (Route $route) use ($article, $extractedData) {
            $channel = PlatformChannel::with(['platformInstance', 'activePlatformAccounts'])->find($route->platform_channel_id);
            $account = $channel?->activePlatformAccounts()->first();

            if (! $account) {
                $this->logSaver->warning('No active account for channel', $channel, [
                    'article_id' => $article->id,
                    'route_priority' => $route->priority,
                ]);

                return null;
            }

            return $this->publishToChannel($article, $extractedData, $channel, $account);
        })->filter();
    }

    /**
     * @param  array<string, mixed>  $extractedData
     */
    private function publishToChannel(Article $article, array $extractedData, PlatformChannel $channel, mixed $account): ?ArticlePublication
    {
        try {
            // Check if this URL or title was already posted to this channel
            $title = $extractedData['title'] ?? $article->title;
            if (PlatformChannelPost::duplicateExists(
                $channel->platformInstance->platform,
                (string) $channel->channel_id,
                $article->url,
                $title
            )) {
                $this->logSaver->info('Skipping duplicate: URL or title already posted to channel', $channel, [
                    'article_id' => $article->id,
                    'url' => $article->url,
                    'title' => $title,
                ]);

                return null;
            }

            $publisher = $this->makePublisher($account);
            $postData = $publisher->publishToChannel($article, $extractedData, $channel);

            $publication = ArticlePublication::create([
                'article_id' => $article->id,
                'post_id' => $postData['post_view']['post']['id'],
                'platform_channel_id' => $channel->id,
                'published_by' => $account->username,
                'published_at' => now(),
                'platform' => $channel->platformInstance->platform->value,
                'publication_data' => $postData,
            ]);

            $this->logSaver->info('Published to channel', $channel, [
                'article_id' => $article->id,
            ]);

            return $publication;
        } catch (Exception $e) {
            $this->logSaver->warning('Failed to publish to channel', $channel, [
                'article_id' => $article->id,
                'error' => $e->getMessage(),
            ]);

            return null;
        }
    }
}