<?php namespace MapGuesser\Controller;

use DateTime;
use MapGuesser\Interfaces\Request\IRequest;
use MapGuesser\Util\Geo\Position;
use MapGuesser\Response\JsonContent;
use MapGuesser\Interfaces\Response\IContent;
use MapGuesser\Multi\MultiConnector;
use MapGuesser\PersistentData\PersistentDataManager;
use MapGuesser\Repository\MultiRoomRepository;
use MapGuesser\Repository\PlaceRepository;

class GameFlowController
{
    const NUMBER_OF_ROUNDS = 5;
    const MAX_SCORE = 1000;

    private IRequest $request;

    private PersistentDataManager $pdm;

    private MultiConnector $multiConnector;

    private MultiRoomRepository $multiRoomRepository;

    private PlaceRepository $placeRepository;

    public function __construct(IRequest $request)
    {
        $this->request = $request;
        $this->pdm = new PersistentDataManager();
        $this->multiConnector = new MultiConnector();
        $this->multiRoomRepository = new MultiRoomRepository();
        $this->placeRepository = new PlaceRepository();
    }

    public function initialData(): IContent
    {
        $mapId = (int) $this->request->query('mapId');
        $session = $this->request->session();

        if (!($state = $session->get('state')) || $state['mapId'] !== $mapId) {
            return new JsonContent(['error' => 'no_session_found']);
        }

        if (!isset($state['currentRound']) || $state['currentRound'] == -1 || $state['currentRound'] >= static::NUMBER_OF_ROUNDS) {
            $this->startNewGame($state, $mapId);
            $session->set('state', $state);
        }

        $response = [];

        $last = $state['rounds'][$state['currentRound']];
        $response['place'] = [
            'panoId' => $last['panoId'],
            'pov' => $last['pov']->toArray()
        ];

        $response['history'] = [];
        for ($i = 0; $i < $state['currentRound']; ++$i) {
            $round = $state['rounds'][$i];
            $response['history'][] = [
                'position' => $round['position']->toArray(),
                'guessPosition' => $round['guessPosition']->toArray(),
                'distance' => $round['distance'],
                'score' => $round['score']
            ];
        }

        return new JsonContent($response);
    }

    public function multiInitialData(): IContent
    {
        $roomId = $this->request->query('roomId');
        $session = $this->request->session();

        if (!($multiState = $session->get('multiState')) || $multiState['roomId'] !== $roomId) {
            return new JsonContent(['error' => 'no_session_found']);
        }

        $room = $this->multiRoomRepository->getByRoomId($roomId);
        $state = $room->getStateArray();
        $members = $room->getMembersArray();

        if ($members['owner'] !== $multiState['token']) {
            return new JsonContent(['error' => 'not_owner_of_room']);
        }

        if ($state['currentRound'] == -1 || $state['currentRound'] >= static::NUMBER_OF_ROUNDS - 1) {
            $this->startNewGame($state, $state['mapId']);
            $room->setStateArray($state);
            $room->setUpdatedDate(new DateTime());
            $this->pdm->saveToDb($room);
        }

        $places = [];
        foreach ($state['rounds'] as $round) {
            $places[] = [
                'position' => $round['position']->toArray(),
                'panoId' => $round['panoId'],
                'pov' => $round['pov']->toArray()
            ];
        }

        $this->multiConnector->sendMessage('start_game', ['roomId' => $roomId, 'places' => $places]);

        return new JsonContent(['ok' => true]);
    }

    public function guess(): IContent
    {
        $mapId = (int) $this->request->query('mapId');
        $session = $this->request->session();

        if (!($state = $session->get('state')) || $state['mapId'] !== $mapId) {
            return new JsonContent(['error' => 'no_session_found']);
        }

        $last = $state['rounds'][$state['currentRound']];
        $guessPosition = new Position((float) $this->request->post('lat'), (float) $this->request->post('lng'));
        $result = $this->evalueteGuess($last['position'], $guessPosition, $state['area']);

        $last['guessPosition'] = $guessPosition;
        $last['distance'] = $result['distance'];
        $last['score'] = $result['score'];

        $response = [
            'result' => [
                'position' => $last['position']->toArray(),
                'distance' => $result['distance'],
                'score' => $result['score']
            ]
        ];

        $state['rounds'][$state['currentRound']] = $last;
        $state['currentRound'] += 1;
        if ($state['currentRound'] < static::NUMBER_OF_ROUNDS) {
            $next = $state['rounds'][$state['currentRound']];

            $response['place'] = [
                'panoId' => $next['panoId'],
                'pov' => $next['pov']->toArray()
            ];
        }

        $session->set('state', $state);

        return new JsonContent($response);
    }

    public function multiGuess(): IContent
    {
        $roomId = $this->request->query('roomId');
        $session = $this->request->session();

        if (!($multiState = $session->get('multiState')) || $multiState['roomId'] !== $roomId) {
            return new JsonContent(['error' => 'no_session_found']);
        }

        $room = $this->multiRoomRepository->getByRoomId($roomId);
        $state = $room->getStateArray();

        $last = $state['rounds'][$state['currentRound']];
        $guessPosition = new Position((float) $this->request->post('lat'), (float) $this->request->post('lng'));
        $result = $this->evalueteGuess($last['position'], $guessPosition, $state['area']);

        $this->multiConnector->sendMessage('guess', [
            'roomId' => $roomId,
            'token' => $multiState['token'],
            'guess' => $guessPosition->toArray(),
            'distance' => $result['distance'],
            'score' => $result['score']
        ]);

        $response = [
            'result' => [
                'position' => $last['position']->toArray(),
                'distance' => $result['distance'],
                'score' => $result['score']
            ]
        ];

        return new JsonContent($response);
    }

    public function multiNextRound(): IContent
    {
        $roomId = $this->request->query('roomId');
        $session = $this->request->session();

        if (!($multiState = $session->get('multiState')) || $multiState['roomId'] !== $roomId) {
            return new JsonContent(['error' => 'no_session_found']);
        }

        $room = $this->multiRoomRepository->getByRoomId($roomId);
        $state = $room->getStateArray();
        $members = $room->getMembersArray();

        if ($members['owner'] !== $multiState['token']) {
            return new JsonContent(['error' => 'not_owner_of_room']);
        }

        $state['currentRound'] += 1;
        if ($state['currentRound'] < static::NUMBER_OF_ROUNDS) {
            $this->multiConnector->sendMessage('next_round', ['roomId' => $roomId, 'currentRound' => $state['currentRound']]);
        }

        $room->setStateArray($state);
        $room->setUpdatedDate(new DateTime());
        $this->pdm->saveToDb($room);

        return new JsonContent(['ok' => true]);
    }

    private function evalueteGuess(Position $realPosition, Position $guessPosition, float $area)
    {
        $distance = $this->calculateDistance($realPosition, $guessPosition);
        $score = $this->calculateScore($distance, $area);

        return ['distance' => $distance, 'score' => $score];
    }

    private function startNewGame(array &$state, int $mapId): void
    {
        $places = $this->placeRepository->getRandomNForMapWithValidPano($mapId, static::NUMBER_OF_ROUNDS);

        $state['rounds'] = [];
        $state['currentRound'] = 0;

        foreach ($places as $place) {
            $state['rounds'][] = [
                'placeId' => $place->getId(),
                'position' => $place->getPosition(),
                'panoId' => $place->getPanoIdCached(),
                'pov' => $place->getPov()
            ];
        }
    }

    private function calculateDistance(Position $realPosition, Position $guessPosition): float
    {
        return $realPosition->calculateDistanceTo($guessPosition);
    }

    private function calculateScore(float $distance, float $area): int
    {
        $goodness = 1.0 - ($distance / (sqrt($area) * 1000));

        return (int) round(pow(static::MAX_SCORE, $goodness));
    }
}