<?php

namespace App\Jobs;

use App\Enums\RoomStateChange;
use App\Events\RoomStateChanged;
use App\Models\Player;
use App\Models\Room;
use App\Services\Rooms\RoomRealtimeStateService;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Queue\Queueable;
use Illuminate\Support\Facades\DB;

class RemoveAbsentPlayers implements ShouldQueue
{
    use Queueable;

    public function handle(RoomRealtimeStateService $realtimeState): void
    {
        $cutoff = now()->subHour();

        Player::query()
            ->where(function ($query) use ($cutoff): void {
                $query->where('last_seen_at', '<=', $cutoff)
                    ->orWhere(function ($query) use ($cutoff): void {
                        $query->whereNull('last_seen_at')
                            ->where('created_at', '<=', $cutoff);
                    });
            })
            ->select(['id', 'room_id'])
            ->chunkById(100, function ($players) use ($cutoff, $realtimeState): void {
                foreach ($players as $player) {
                    $result = DB::transaction(function () use ($player, $cutoff): ?array {
                        $room = Room::withTrashed()
                            ->lockForUpdate()
                            ->find($player->room_id);

                        if ($room === null) {
                            return null;
                        }

                        $currentPlayer = $room->players()
                            ->lockForUpdate()
                            ->find($player->id);

                        if ($currentPlayer === null) {
                            return null;
                        }

                        $lastActivity = $currentPlayer->last_seen_at ?? $currentPlayer->created_at;

                        if ($lastActivity === null || $lastActivity->greaterThan($cutoff)) {
                            return null;
                        }

                        $currentPlayer->delete();
                        $roomDeleted = false;

                        if ($room->owner_id === null && ! $room->trashed()) {
                            if (! $room->players()->exists()) {
                                $room->delete();
                                $roomDeleted = true;
                            } elseif (! $room->players()->where('is_moderator', true)->exists()) {
                                $successor = $room->players()
                                    ->where(function ($query) use ($cutoff): void {
                                        $query->where('last_seen_at', '>', $cutoff)
                                            ->orWhere(function ($query) use ($cutoff): void {
                                                $query->whereNull('last_seen_at')
                                                    ->where('created_at', '>', $cutoff);
                                            });
                                    })
                                    ->orderBy('created_at')
                                    ->orderBy('id')
                                    ->first();

                                $successor?->update(['is_moderator' => true]);
                            }
                        }

                        $room->update([
                            'state_version' => $room->state_version + 1,
                        ]);

                        return [$room, $roomDeleted];
                    });

                    if ($result === null) {
                        continue;
                    }

                    [$room, $roomDeleted] = $result;

                    if ($roomDeleted) {
                        RoomStateChanged::dispatch(
                            $room->id,
                            $room->state_version,
                            RoomStateChange::RoomDeleted,
                        );
                    } elseif (! $room->trashed()) {
                        RoomStateChanged::dispatch(
                            $room->id,
                            $room->state_version,
                            RoomStateChange::PlayerKicked,
                            $realtimeState->for($room),
                            $player->id,
                        );
                    }
                }
            });
    }
}