<?php

namespace App\Http\Controllers;

use App\Models\SummaryRequest;
use Illuminate\Http\Request;

class SummaryRequestController extends Controller
{
    public function __construct()
    {
        $this->middleware('auth');
    }

    /** List the current user's requests */
    public function index(Request $request)
    {
        $requests = SummaryRequest::where('user_id', $request->user()->id)
            ->orderByDesc('created_at')
            ->paginate(12);

        return view('requests.index', [
            'requests' => $requests,
        ]);
    }

    /** Show the create form */
    public function create(Request $request)
    {
        $prefill = [
            'gutenberg' => $request->query('gutenberg'),
            'title' => $request->query('title'),
        ];
        return view('requests.create', $prefill);
    }

    /** Store the request */
    public function store(Request $request)
    {
        $data = $request->validate([
            'gutenberg' => 'required|string|max:255', // can be URL or ID
            'title' => 'nullable|string|max:255',
            'notes' => 'nullable|string|max:2000',
        ]);

        $gutenbergId = $this->parseGutenbergId($data['gutenberg']);
        if (!$gutenbergId) {
            return back()->withErrors(['gutenberg' => 'Please provide a valid Project Gutenberg URL or numeric ID.'])->withInput();
        }

        $requestModel = SummaryRequest::firstOrCreate([
            'user_id' => $request->user()->id,
            'gutenberg_id' => $gutenbergId,
        ], [
            'title' => $data['title'] ?? null,
            'notes' => $data['notes'] ?? null,
            'status' => 'pending',
        ]);

        // If already exists, update title/notes to latest provided
        if (!$requestModel->wasRecentlyCreated) {
            $requestModel->update([
                'title' => $data['title'] ?? $requestModel->title,
                'notes' => $data['notes'] ?? $requestModel->notes,
            ]);
        }

        return redirect()->route('requests.index')->with('success', 'Your summary request has been submitted. We will process it soon.');
    }

    private function parseGutenbergId(string $input): ?int
    {
        $input = trim($input);
        // If pure number
        if (ctype_digit($input)) {
            return (int) $input;
        }

        // Try to extract from URL
        $patterns = [
            '/gutenberg\.org\/(?:ebooks|etext)\/(\d+)/i', // https://www.gutenberg.org/ebooks/1342
            '/gutenberg\.org\/(?:files)\/(\d+)\//i',      // https://www.gutenberg.org/files/1342/1342-h/1342-h.htm
        ];
        foreach ($patterns as $pattern) {
            if (preg_match($pattern, $input, $m)) {
                return (int) $m[1];
            }
        }
        return null;
    }
}