<?php

namespace App\Services;

use App\Models\Article;
use App\Models\QuickReply;
use Illuminate\Contracts\Pagination\LengthAwarePaginator;
use Illuminate\Support\Facades\DB;

class AdminArticleService
{
    public function paginate(int $perPage = 10, ?string $search = null): LengthAwarePaginator
    {
        $search = $search !== null ? trim($search) : '';

        $numericSearch = ltrim($search, '#');

        return Article::query()
            ->with('quickReplies')
            ->when($search !== '', function ($query) use ($numericSearch, $search): void {
                $like = "%{$search}%";

                $query->where(function ($query) use ($numericSearch, $like): void {
                    $query
                        ->where('title', 'ilike', $like)
                        ->orWhere('content', 'ilike', $like)
                        ->orWhere('source_url', 'ilike', $like)
                        ->orWhere('source_article_id', 'ilike', $like);

                    if (ctype_digit($numericSearch)) {
                        $query->orWhere('id', (int) $numericSearch);
                    }
                });
            })
            ->latest()
            ->paginate($perPage);
    }

    public function create(string $title, string $content, ?string $note = null, array $allowedActions = []): Article
    {
        return Article::query()->create([
            'title' => trim($title),
            'content' => trim($content),
            'note' => $note !== null && trim($note) !== '' ? trim($note) : null,
            'allowed_actions' => $this->sanitizeAllowedActions($allowedActions),
            'status' => 'published',
            'is_ai_draft' => false,
        ]);
    }

    public function deleteById(int $articleId): bool
    {
        return (bool) Article::query()->whereKey($articleId)->delete();
    }

    public function findById(int $articleId): ?Article
    {
        return Article::query()->find($articleId);
    }

    public function updateContent(int $articleId, string $title, string $content): bool
    {
        $article = Article::query()->find($articleId);
        if ($article === null) {
            return false;
        }

        $article->title = trim($title);
        $article->content = trim($content);
        $article->save();

        return true;
    }

    public function updateMetadata(int $articleId, ?string $note, array $allowedActions, array $quickReplyIds = []): bool
    {
        $article = Article::query()->find($articleId);
        if ($article === null) {
            return false;
        }

        DB::transaction(function () use ($article, $note, $allowedActions, $quickReplyIds): void {
            $article->note = $note !== null && trim($note) !== '' ? trim($note) : null;
            $article->allowed_actions = $this->sanitizeAllowedActions($allowedActions);
            $article->save();
            $article->quickReplies()->sync($this->existingQuickReplyIds($quickReplyIds));
        });

        return true;
    }

    public function approveDraft(int $articleId): bool
    {
        $article = Article::query()->find($articleId);
        if ($article === null) {
            return false;
        }

        $article->status = 'published';
        $article->is_ai_draft = false;
        $article->save();

        return true;
    }

    private function sanitizeAllowedActions(array $allowedActions): array
    {
        return array_values(array_intersect(array_unique($allowedActions), ['domain_inf']));
    }

    private function existingQuickReplyIds(array $quickReplyIds): array
    {
        $ids = array_values(array_unique(array_filter(
            array_map(static fn ($id) => (int) $id, $quickReplyIds),
            static fn ($id) => $id > 0
        )));

        if ($ids === []) {
            return [];
        }

        return QuickReply::query()
            ->whereIn('id', $ids)
            ->pluck('id')
            ->map(static fn ($id) => (int) $id)
            ->all();
    }
}