<?php

namespace App\Http\Controllers;

use App\Enums\RoomStateChange;
use App\Events\RoomStateChanged;
use App\Http\Requests\JoinRoomRequest;
use App\Models\Player;
use App\Models\Room;
use Illuminate\Http\RedirectResponse;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;

class RoomPlayerController extends Controller
{
    public function join(JoinRoomRequest $request): RedirectResponse
    {
        $validated = $request->validated();
        $user = $request->user();

        [$room, $player] = DB::transaction(function () use ($request, $validated, $user): array {
            $room = Room::query()
                ->where('join_code', $validated['join_code'])
                ->lockForUpdate()
                ->firstOrFail();

            if ($room->isClosed()) {
                throw ValidationException::withMessages([
                    'join_code' => 'Dieser Raum ist geschlossen.',
                ]);
            }

            $player = $this->existingPlayer($request, $room);

            if ($player === null) {
                $player = $room->players()->create([
                    'user_id' => $user?->id,
                    'name' => $validated['player_name'],
                    'is_moderator' => false,
                    'last_seen_at' => now(),
                ]);
            } else {
                $player->update(['last_seen_at' => now()]);
            }

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

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

        $request->session()->put(
            "room_players.{$room->id}",
            $player->id,
        );

        RoomStateChanged::dispatch(
            $room->id,
            $room->state_version,
            RoomStateChange::PlayerJoined,
        );

        return to_route('room.show', $room);
    }

    private function existingPlayer(JoinRoomRequest $request, Room $room): ?Player
    {
        if ($request->user() !== null) {
            return $room->players()
                ->where('user_id', $request->user()->id)
                ->first();
        }

        $playerId = $request->session()->get("room_players.{$room->id}");

        return is_numeric($playerId)
            ? $room->players()->find((int) $playerId)
            : null;
    }
}