<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Http\Resources\PublicDocumentCollectionResource;
use App\Http\Resources\PublicDocumentResource;
use App\Models\Document;
use Illuminate\Http\Request;

class PublicDocumentController extends Controller
{
    /**
     * List public documents for external site consumption.
     */
    public function index(Request $request)
    {
        $query = Document::query()
            ->with(['category', 'currentVersion.uploadedBy'])
            ->where('status', 'active')
            ->where('access_level', 'public')
            ->whereNotNull('current_version_id')
            ->orderByDesc('updated_at');

        if ($request->filled('search')) {
            $search = trim((string) $request->input('search'));
            $query->where(function ($q) use ($search) {
                $q->where('title', 'like', "%{$search}%")
                    ->orWhere('description', 'like', "%{$search}%")
                    ->orWhere('document_number', 'like', "%{$search}%");
            });
        }

        if ($request->filled('category')) {
            $category = (string) $request->input('category');

            if (ctype_digit($category)) {
                $query->where('document_category_id', (int) $category);
            } else {
                $query->whereHas('category', function ($q) use ($category) {
                    $q->where('slug', $category);
                });
            }
        }

        $perPage = min(max($request->integer('per_page', 100), 1), 500);

        return PublicDocumentCollectionResource::collection(
            $query->paginate($perPage)->withQueryString()
        );
    }

    /**
     * Show a single public document with version history.
     */
    public function show(string $uuid)
    {
        $document = Document::query()
            ->with([
                'category',
                'currentVersion.uploadedBy',
                'versions.uploadedBy',
                'versions.document',
                'createdBy',
                'lastUpdatedBy',
            ])
            ->where('public_uuid', $uuid)
            ->where('status', 'active')
            ->where('access_level', 'public')
            ->whereNotNull('current_version_id')
            ->firstOrFail();

        $related = Document::query()
            ->with(['category', 'currentVersion.uploadedBy'])
            ->where('status', 'active')
            ->where('access_level', 'public')
            ->whereNotNull('current_version_id')
            ->where('id', '!=', $document->id)
            ->where('document_category_id', $document->document_category_id)
            ->orderByDesc('updated_at')
            ->limit(4)
            ->get();

        return response()->json([
            'data' => new PublicDocumentResource($document),
            'related' => PublicDocumentCollectionResource::collection($related),
        ]);
    }
}