<?php

namespace App\Http\Controllers;

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

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

        $principalUri = $request->user()->uri;
        $source = rtrim(trim($data['source']), '/');
        $desc = 'Remote feed: '.$source;

        /* if they already subscribed to this exact feed, don’t create duplicates */
        if (Subscription::where('principaluri', $principalUri)->where('source', $source)->exists()) {
            return Redirect::route('calendar.index')->with('toast', [
                'message' => __('You are already subscribed to that calendar.'),
                'type'    => 'info',
            ]);
        }

        $sub = DB::transaction(function () use ($request, $data, $principalUri, $source, $desc) {

            /* check if a mirror instance already exists */
            $existingInstance = CalendarInstance::where('principaluri', $principalUri)
                ->where('description', $desc)
                ->first();


            /* create the calendarsubscriptions record */
            $sub = Subscription::create([
                'uri'           => (string) Str::uuid(),
                'principaluri'  => $principalUri,
                'source'        => $source,
                'displayname'   => $data['displayname'] ?: $source,
                'calendarcolor' => $data['color'] ?? '#1a1a1a',
                'refreshrate'   => 'P1D',
                'lastmodified'  => now()->timestamp,
            ]);

            // choose the calendar container
            if ($existingInstance) {
                $calId = $existingInstance->calendarid;

                // keep the mirror instance’s user-facing bits up to date
                $existingInstance->update([
                    'displayname'   => $sub->displayname,
                    'calendarcolor' => $sub->calendarcolor,
                    'timezone'      => config('app.timezone', 'UTC'),
                ]);
            } else {
                // create new empty calendar container
                $calId = Calendar::create([
                    'synctoken'  => 1,
                    'components' => 'VEVENT',
                ])->id;

                // create mirror calendarinstance row
                CalendarInstance::create([
                    'calendarid'    => $calId,
                    'principaluri'  => $sub->principaluri,
                    'uri'           => Str::uuid(),
                    'displayname'   => $sub->displayname,
                    'description'   => $desc,
                    'calendarcolor' => $sub->calendarcolor,
                    'timezone'      => config('app.timezone', 'UTC'),
                ]);
            }

            // upsert our calendar_meta entry by calendar_id (since that’s your pk)
            CalendarMeta::updateOrCreate(
                ['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 $sub;
        });

        // sync immediately so events appear without waiting for the */10 dispatcher
        SyncSubscription::dispatch($sub)->afterCommit();

        return redirect()
            ->route('calendar.index')
            ->with('toast', [
                'message' => __('Subscription added! Syncing events now...'),
                'type'    => 'success',
            ]);
    }

    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!'));
    }
}