kithkin/app/Http/Controllers/CalendarController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Str;
use Illuminate\Support\Facades\DB;
use App\Models\Calendar;
use App\Models\CalendarMeta;
use App\Models\CalendarInstance;

class CalendarController extends Controller
{
    /**
     * list calendars owned by the logged-in user
     */
    public function index()
    {
        $principal = auth()->user()->principal_uri;

        $calendars = Calendar::query()
            ->select('calendars.*', 'ci.displayname as instance_displayname')  // ← add
            ->join('calendarinstances as ci', 'ci.calendarid', '=', 'calendars.id')
            ->where('ci.principaluri', $principal)
            ->orderBy('ci.displayname')
            ->with(['meta'])          // no need to eager-load full instances any more
            ->get();

        return view('calendars.index', compact('calendars'));
    }

    public function create()
    {
        return view('calendars.create');
    }

    /**
     * create sabre calendar + meta
     */
    public function store(Request $request)
    {
        $data = $request->validate([
            'name'        => 'required|string|max:100',
            'description' => 'nullable|string|max:255',
            'timezone'    => 'required|string',
            'color'       => 'nullable|regex:/^#[0-9A-Fa-f]{6}$/',
        ]);

        // update master calendar entry
        $calId = DB::table('calendars')->insertGetId([
            'synctoken'  => 1,
            'components' => 'VEVENT', // or 'VEVENT,VTODO' if you add tasks
        ]);

        // update the calendar instance row
        $instance = CalendarInstance::create([
            'calendarid'   => $calId,
            'principaluri' => auth()->user()->principal_uri,
            'uri'          => Str::uuid(),
            'displayname'  => $data['name'],
            'description'  => $data['description'] ?? null,
            'calendarcolor'=> $data['color'] ?? null,
            'timezone'     => $data['timezone'],
        ]);

        // update calendar meta
        $instance->meta()->create([
            'calendar_id' => $instanceId,
            'color'       => $data['color'] ?? null,
            'created_at'  => now(),
            'updated_at'  => now(),
        ]);

        return redirect()->route('calendars.index');
    }

    /**
     * show calendar details
     */
    public function show(Calendar $calendar)
    {
        $this->authorize('view', $calendar);

        $calendar->load([
            'meta',
            'instances' => fn ($q) => $q->where('principaluri', auth()->user()->principal_uri),
        ]);

        /* grab the single instance for convenience in the view */
        $instance = $calendar->instances->first();
        $caldavUrl = $instance?->caldavUrl();   // null-safe

        /* events + meta, newest first */
        $events = $calendar->events()
            ->with('meta')
            ->orderByDesc('lastmodified')
            ->get();

        return view(
            'calendars.show',
            compact('calendar', 'instance', 'events', 'caldavUrl')
        );
    }

    /**
     * edit calendar page
     */
    public function edit(Calendar $calendar)
    {
        $this->authorize('update', $calendar);

        $calendar->load([
        'meta',
        'instances' => fn ($q) =>
            $q->where('principaluri', auth()->user()->principal_uri),
        ]);

        $instance = $calendar->instances->first();   // may be null but shouldn’t

        return view('calendars.edit', compact('calendar', 'instance'));
    }

    /**
     * update sabre + meta records
     */
    public function update(Request $request, Calendar $calendar)
    {
        $this->authorize('update', $calendar);

        $data = $request->validate([
            'name'        => 'required|string|max:100',
            'description' => 'nullable|string|max:255',
            'timezone'    => 'required|string',
            'color'       => 'nullable|regex:/^#[0-9A-Fa-f]{6}$/',
        ]);

        // update the instance row
        $calendar->instances()
            ->where('principaluri', auth()->user()->principal_uri)
            ->update([
                'displayname' => $data['name'],
                'description' => $data['description'] ?? '',
                'calendarcolor' => $data['color'] ?? null,
                'timezone'    => $data['timezone'],
            ]);

        // bump synctoken on master calendar row
        $calendar->increment('synctoken');

        // update calendar meta (our table)
        $calendar->meta()->updateOrCreate([], [
            'color' => $data['color'] ?? null]
        );

        return redirect()
            ->route('calendars.show', $calendar)
            ->with('toast', __('Calendar saved successfully!'));
    }

    /**
     * delete calendar @todo
     */
    public function destroy(Calendar $calendar)
    {
        $this->authorize('delete', $calendar);
        $calendar->delete();          // cascades to meta via FK
        return redirect()->route('calendars.index');
    }
}