<?php

namespace App\Http\Controllers;

use App\Events\EventParticipationCancelled;
use App\Models\Event;
use App\Models\Notification;
use App\Mail\EventParticipationCancelledMail;
use App\Models\Task;
use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;
use Illuminate\Support\Facades\Gate;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Mail;
use Carbon\Carbon;


class EventsController extends Controller
{
    public function create(Request $request): JsonResponse
    {


        if (Gate::denies('create', Event::class)) {
            return response()->json(['message' => 'Forbidden'], 403);
        }

        try {

            Event::create([
                "name" => $request['name'],
                "description" => $request['description'],
                "start" => $request['start'],
                "end" => $request['end'],
            ]);

            return response()->json(['message' => 'Event created']);

        } catch (\Exception $e) {
            Log::info($e->getMessage());
            return response()->json(['message' => "Server error"], 500);
        }

    }

    public function update(Request $request, int $id): JsonResponse {

        if (Gate::denies('update', Event::class)) {
            return response()->json(['message' => 'Forbidden'], 403);
        }

        try {

            $event = Event::find($id);

            $event->name = $request['name'];
            $event->description = $request['description'];
            $event->start = $request['start'];
            $event->end = $request['end'];
            $event->save();

            return response()->json(["message" => "Event updated"]);

        } catch (\Exception $e) {
            Log::info($e->getMessage());
            return response()->json(['message' => "Server error"], 500);
        }
    }

    public function getEvents(Request $request): JsonResponse {
        try {
            $events = Event::with('tasks')->get();

            return response()->json(['data' => $events]);

        } catch (\Exception $e) {
            Log::info($e->getMessage());
            return response()->json(['message' => "Server error"], 500);
        }
    }


    public function delete(Request $request, int $id): JsonResponse {

        if (Gate::denies('delete', Event::class)) {
            return response()->json(['message' => 'Forbidden'], 403);
        }

        try {
            $event = Event::with('tasks.users')->find($id);

            if (!$event) {
                return response()->json(['message' => 'Event not found'], 404);
            }

            $participants = $event->tasks->flatMap(function ($task) {
                return $task->users;
            })->unique('id');


            if (Carbon::now()->lessThanOrEqualTo($event->end)) {
                $notification = Notification::create([
                    'content' => "L'événement '{$event->name}' a été supprimé. Vous n'y participez donc plus."
                ]);
                $notification->users()->attach($participants->pluck('id'));

                foreach ($participants as $user) {
                    broadcast(new EventParticipationCancelled(
                        $user->id,
                        $event,
                        $notification->id,
                    ));

                    $data = [
                        'name' => $user->name,
                        'lastname' => $user->lastname,
                        'eventName' => $event->name,
                        'start' => $event->start,
                        'end' => $event->end,
                    ];
                    Mail::to($user->email)->send(new EventParticipationCancelledMail($data));
                }
            }

            $event->delete();
            return response()->json(["message" => "Event deleted and participants notified"]);
        } catch (\Exception $e) {
            Log::error("Event delete error: " . $e->getMessage());
            return response()->json(['message' => "Server error"], 500);
        }
    }

    public function getEvent(Request $request, int $id): JsonResponse {
        try {

            $event = Event::find($id);
            return response()->json([
                "id" => $event->id,
                "name" => $event->name,
                "description" => $event->description,
                "start" => $event->start,
                "end" => $event->end,
                "created_at" => $event->created_at,
                "updated_at" => $event->updated_at,
                "tasks" => $event->tasks,
            ]);
        } catch (\Exception $e) {
            Log::info($e->getMessage());
            return response()->json(['message' => "Server error"], 500);
        }
    }

    public function isUserAssigned(Request $request, int $id): JsonResponse
    {
        try {
            $task = Task::findOrFail($id);

            $isAssigned = $task->users()
                ->where('users.id', $request->user()->id)
                ->exists();

            return response()->json([
                'assigned' => $isAssigned
            ], 200);

        } catch (\Exception $e) {
            Log::error($e->getMessage());

            return response()->json([
                'message' => 'Server error'
            ], 500);
        }
    }
}