<?php

namespace App\Http\Controllers;

use App\Models\Assegnazione;
use Illuminate\Contracts\View\View;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\Storage;
use Symfony\Component\HttpFoundation\StreamedResponse;

class AssignmentPdfController extends Controller
{
    public function viewer(Request $request, Assegnazione $assignment, string $code): View
    {
        $this->validateAccess($assignment, $code);

        if ($expired = $this->linkScaduto($assignment)) {
            return $expired;
        }

        $pdfUrl = route('assignments.pdf.file', [
            'assignment' => $assignment->id,
            'code'       => $code,
        ]);

        return view('assignments.pdf-viewer', [
            'assignment'      => $assignment,
            'pdfUrl'          => $pdfUrl,
            'showDownload'    => (bool) \App\Models\Setting::getValue('pdf_viewer_show_download', true),
        ]);
    }

    public function file(Request $request, Assegnazione $assignment, string $code): StreamedResponse|View
    {
        $this->validateAccess($assignment, $code);

        if ($expired = $this->linkScaduto($assignment)) {
            return $expired;
        }

        $pdfPath = $assignment->territorio?->pdf_path;
        abort_unless($pdfPath && Storage::disk('public')->exists($pdfPath), 404);

        return Storage::disk('public')->response(
            $pdfPath,
            'territorio-' . $assignment->territorio?->numero . '.pdf',
            [
                'Content-Type'        => 'application/pdf',
                'Content-Disposition' => 'inline; filename="territorio-' . $assignment->territorio?->numero . '.pdf"',
            ]
        );
    }

    protected function validateAccess(Assegnazione $assignment, string $code): void
    {
        abort_unless($assignment->pdf_access_code && hash_equals($assignment->pdf_access_code, $code), 404);
        abort_unless($assignment->is_aperta, 403);
        abort_unless($assignment->territorio?->pdf_path, 404);
    }

    protected function linkScaduto(Assegnazione $assignment): ?View
    {
        if (auth()->check()) {
            return null;
        }

        $ttlMonths = max(1, (int) \App\Models\Setting::getValue('assignment_link_ttl_hours', 1));

        if ($assignment->assigned_at->copy()->addMonths($ttlMonths)->isPast()) {
            return view('assignments.link-scaduto', [
                'numero' => $assignment->territorio?->numero,
            ]);
        }

        return null;
    }
}