<?php

namespace App\Http\Controllers;

use App\Models\NetworkIpNote;
use App\Models\NetworkSegment;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Artisan;
use Illuminate\Support\Facades\DB;
use Illuminate\View\View;

class NetworkSegmentController extends Controller
{
    public function index(): View
    {
        $segments = NetworkSegment::withCount('scans')
            ->orderBy('name')
            ->get();

        return view('network.segments.index', compact('segments'));
    }

    public function create(): View
    {
        return view('network.segments.create');
    }

    public function store(Request $request): RedirectResponse
    {
        $validated = $request->validate([
            'name'        => ['required', 'string', 'max:100'],
            'subnet'      => ['required', 'string', 'max:50'],
            'vlan_id'     => ['nullable', 'integer', 'min:1', 'max:4094'],
            'active'      => ['boolean'],
            'description' => ['nullable', 'string', 'max:500'],
        ]);

        $validated['active']     = $request->boolean('active', true);
        $validated['created_by'] = auth()->id();

        NetworkSegment::create($validated);

        return redirect()->route('network.segments.index')
            ->with('success', "Segment \"{$validated['name']}\" angelegt.");
    }

    public function show(NetworkSegment $segment): View
    {
        $scans = $segment->scans()->latest()->paginate(20);
        $latestScan = $segment->scans()->latest()->first();

        return view('network.segments.show', compact('segment', 'scans', 'latestScan'));
    }

    public function edit(NetworkSegment $segment): View
    {
        return view('network.segments.edit', compact('segment'));
    }

    public function update(Request $request, NetworkSegment $segment): RedirectResponse
    {
        $validated = $request->validate([
            'name'        => ['required', 'string', 'max:100'],
            'subnet'      => ['required', 'string', 'max:50'],
            'vlan_id'     => ['nullable', 'integer', 'min:1', 'max:4094'],
            'active'      => ['boolean'],
            'description' => ['nullable', 'string', 'max:500'],
        ]);

        $validated['active'] = $request->boolean('active', true);
        $segment->update($validated);

        return redirect()->route('network.segments.index')
            ->with('success', "Segment \"{$segment->name}\" aktualisiert.");
    }

    public function destroy(NetworkSegment $segment): RedirectResponse
    {
        $name = $segment->name;
        $segment->delete();

        return redirect()->route('network.segments.index')
            ->with('success', "Segment \"{$name}\" gelöscht.");
    }

    public function triggerScan(NetworkSegment $segment): RedirectResponse
    {
        if (!$segment->active) {
            return back()->with('error', 'Segment ist inaktiv.');
        }

        // Scan im Hintergrund starten (non-blocking)
        $projectPath = base_path();
        $phpBinary   = PHP_BINARY;
        $cmd = "cd {$projectPath} && {$phpBinary} artisan network:scan {$segment->id} --force > /dev/null 2>&1 &";
        exec($cmd);

        return redirect()->route('network.segments.show', $segment)
            ->with('success', "Scan für \"{$segment->name}\" wurde gestartet. Ergebnisse erscheinen in Kürze.");
    }

    // --- IP-Notiz speichern (Upsert per Segment + IP) ---
    public function saveIpNote(Request $request, NetworkSegment $segment): JsonResponse
    {
        $request->validate([
            'ip_address' => ['required', 'ip'],
            'note'       => ['nullable', 'string', 'max:500'],
        ]);

        NetworkIpNote::updateOrCreate(
            ['segment_id' => $segment->id, 'ip_address' => $request->ip_address],
            [
                'note'       => $request->note,
                'updated_by' => auth()->id(),
                'created_by' => auth()->id(),
            ]
        );

        return response()->json(['ok' => true]);
    }

    // --- Export: Excel (OpenSpout – kein ext-gd, PHP 8.5 kompatibel) ---
    public function exportXlsx(NetworkSegment $segment)
    {
        $hosts = $this->getLatestScanHosts($segment);
        $notes = NetworkIpNote::where('segment_id', $segment->id)
            ->pluck('note', 'ip_address');

        $filename = 'Segment_' . preg_replace('/[^a-zA-Z0-9_-]/', '_', $segment->name)
            . '_' . now()->format('Ymd_Hi') . '.xlsx';
        $tempFile = tempnam(sys_get_temp_dir(), 'net_export_') . '.xlsx';

        $writer = new \OpenSpout\Writer\XLSX\Writer();
        $writer->openToFile($tempFile);

        $writer->addRow(\OpenSpout\Common\Entity\Row::fromValues([
            'IP-Adresse', 'Status', 'Hostname', 'MAC-Adresse', 'Hersteller', 'Ping (ms)', 'Bemerkung',
        ]));

        foreach ($hosts as $host) {
            $writer->addRow(\OpenSpout\Common\Entity\Row::fromValues([
                $host->ip_address,
                $host->status,
                $host->hostname ?? '',
                $host->mac_address ?? '',
                $host->mac_vendor ?? '',
                $host->ping_ms !== null ? (string) $host->ping_ms : '',
                $notes[$host->ip_address] ?? '',
            ]));
        }

        $writer->close();

        return response()->download($tempFile, $filename, [
            'Content-Type' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
        ])->deleteFileAfterSend(true);
    }

    // --- Export: PDF (Browser-Print-View – kein PHP-PDF-Package nötig) ---
    public function exportPdf(NetworkSegment $segment)
    {
        $hosts = $this->getLatestScanHosts($segment);
        $notes = NetworkIpNote::where('segment_id', $segment->id)
            ->pluck('note', 'ip_address');

        return view('network.segments.export-pdf', compact('segment', 'hosts', 'notes'));
    }

    private function getLatestScanHosts(NetworkSegment $segment)
    {
        $latestScan = $segment->scans()->latest()->first();
        if (!$latestScan) {
            return collect();
        }
        return $latestScan->hosts()->orderByRaw('INET_ATON(ip_address)')->get();
    }
}