<?php

namespace App\Http\Controllers;

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

class SubscriptionController extends Controller
{
    public function index()
    {
        $subs = Subscription::where(
            'principaluri',
            auth()->user()->principal_uri
        )->get();

        return view('subscription.index', compact('subs'));
    }

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

    public function store(Request $request)
    {
        $data = $request->validate([
            'source'        => 'required|url',
            'displayname'   => 'nullable|string|max:255',
            'color'         => 'nullable|regex:/^#[0-9A-Fa-f]{6}$/',
            'refreshrate'   => 'nullable|string|max:10',
        ]);

        DB::transaction(function () use ($request, $data) {

            /* add entry into calendarsubscriptions  first */
            $sub = Subscription::create([
                'uri'           => Str::uuid(),
                'principaluri'  => 'principals/'.$request->user()->email,
                'source'        => $data['source'],
                'displayname'   => $data['displayname'] ?: $data['source'],
                'calendarcolor' => $data['color'] ?? '#1a1a1a',
                'refreshrate'   => 'P1D',
                'lastmodified'  => now()->timestamp,
            ]);

            /* create the empty "shadow" calendar container */
            $calId = Calendar::create([
                'synctoken'  => 1,
                'components' => 'VEVENT',
            ])->id;

            /* create the calendarinstance row attached to the user */
            CalendarInstance::create([
                'calendarid'    => $calId,
                'principaluri'  => $sub->principaluri,
                'uri'           => Str::uuid(),
                'displayname'   => $sub->displayname,
                'description'   => 'Remote feed: '.$sub->source,
                'calendarcolor' => $sub->calendarcolor,
                'timezone'      => config('app.timezone', 'UTC'),
            ]);

            /* create our calendar_meta entry */
            CalendarMeta::create([
                'calendar_id'     => $calId,
                'subscription_id' => $sub->id,
                'title'           => $sub->displayname,
                'color'           => $sub->calendarcolor,
                'color_fg'        => contrast_text_color($sub->calendarcolor),
                'is_shared'       => true,
                'is_remote'       => true,
            ]);
        });

        return redirect()
            ->route('calendar.index')
            ->with('toast', __('Subscription added!'));
    }

    public function edit(Subscription $subscription)
    {
        $this->authorize('update', $subscription);
        return view('subscription.edit', ['subscription' => $subscription]);
    }

    public function update(Request $request, Subscription $subscription)
    {
        $this->authorize('update', $subscription);

        $data = $request->validate([
            'displayname'      => 'nullable|string|max:255',
            'calendarcolor'    => 'nullable|regex:/^#[0-9A-Fa-f]{6}$/',
            'refreshrate'      => 'nullable|string|max:10',
            'striptodos'       => 'sometimes|boolean',
            'stripalarms'      => 'sometimes|boolean',
            'stripattachments' => 'sometimes|boolean',
        ]);

        // update calendarsubscriptions record
        $subscription->update($data);

        // update corresponding calendar_meta record
        $subscription->meta()->updateOrCreate(
            [], // no “where” clause → look at subscription_id FK
            [
                'title'     => $subscription->displayname,
                'color'     => $subscription->calendarcolor ?? '#1a1a1a',
                'color_fg'  => contrast_text_color(
                                  $subscription->calendarcolor ?? '#1a1a1a'
                              ),
                'updated_at'=> now(),
            ]
        );

        return back()->with('toast', __('Subscription updated!'));
    }

    public function destroy(Subscription $subscription)
    {
        $this->authorize('delete', $subscription);
        $subscription->delete();

        return back()->with('toast', __('Subscription removed!'));
    }
}