<?php
declare(strict_types=1);

namespace GamesShop\Importer;

use Doctrine\ORM\EntityManagerInterface;
use Exception;
use GamesShop\Entities\Account\User;
use GamesShop\Entities\Games\Game;
use GamesShop\Entities\Games\Key;
use GamesShop\Entities\Games\KeyAttribute;
use GamesShop\Entities\Games\Store;
use PhpOffice\PhpSpreadsheet\IOFactory;

final class GameImporter
{
    private const HEADER_ROW_INDEX = 1;

    private const STORE_ADDITIONAL_CASES = [
        'epic' => Store::EPICGAMES,
        'ea' => Store::ORIGIN,
        'eaplay' => Store::ORIGIN,
        'ubisoft' => Store::UPLAY,
        'activision' => Store::BATTLENET
    ];

    public function __construct(
        private readonly EntityManagerInterface $entityManager,
    ) { }

    /**
     * @param string $path
     * @return ImportColumnInterpretation[]
     */
    public function interpret(string $path): array {
        $spreadsheet = IOFactory::load($path);

        $worksheet = $spreadsheet->getSheet(0);
        $result = [];
        foreach ($worksheet->getColumnIterator() as $column) {
            $columnIndex = $column->getColumnIndex();

            $value = $worksheet->getCell(sprintf('%s%d', $columnIndex, self::HEADER_ROW_INDEX))->getValueString();

            if (empty(trim($value))) {
                continue;
            }

            $guessedAttribute = $this->guessAttribute($value);
            $result[] = new ImportColumnInterpretation(
                $columnIndex,
                $value,
                $guessedAttribute
            );
        }
        return $result;
    }

    private function guessAttribute(string $value): KeyAttribute|null {
        $value = trim($value);
        $value = strtolower($value);
        $value = str_replace(' ', '_', $value);

        $attribute = match($value) {
            'key' => KeyAttribute::KEY,
            'name', 'game_name', 'game' => KeyAttribute::GAME_NAME,
            'from' => KeyAttribute::FROM,
            'store', 'for' => KeyAttribute::STORE,
            default => null
        };

        return $attribute;
    }

    /**
     * @param string[] $columnDefinitions
     */
    public function import(string $path, array $columnDefinitions, User $contributedUser): array {
        $spreadsheet = IOFactory::load($path);

        $worksheet = $spreadsheet->getSheet(0);

        $totalRows = 0;
        $addedAmount = 0;

        foreach ($worksheet->getRowIterator(self::HEADER_ROW_INDEX + 1) as $row) {
            $totalRows++;
            $values = [
                'name' => null,
                'key' => null,
                'from' => null,
                'store' => null,
                'store_link' => null
            ];

            foreach ($columnDefinitions as $columnIndex => $attribute) {
                $value = $worksheet->getCell(sprintf('%s%d', $columnIndex, $row->getRowIndex()))->getValueString();

                switch(KeyAttribute::from($attribute)) {
                    case KeyAttribute::NONE:
                        break;
                    case KeyAttribute::GAME_NAME:
                        $values['name'] = $value;
                        break;
                    case KeyAttribute::KEY:
                        $values['key'] = $value;
                        break;
                    case KeyAttribute::FROM:
                        $values['from'] = $value;
                        break;
                    case KeyAttribute::STORE:
                        $store = $this->interpretStore($value);
                        $values['store'] = $store;
                        if ($store === Store::EXTERNAL) {
                            $values['store_link'] = $value;
                        }
                        break;
                }
            }

            if ($values['key'] === null || $values['name'] === null || $values['store'] === null) {
                continue;
            }

            $game = $this->entityManager->getRepository(Game::class)->findOneBy([ 'name' => $values['name'] ]);
            if ($game === null) {
                $game = new Game($values['name']);
            }

            $key = new Key(
                $game,
                $contributedUser,
                $values['key'],
                $values['store'],
                $values['store_link'],
                $values['from'],
            );

            $this->entityManager->persist($game);
            $this->entityManager->persist($key);
            $addedAmount++;
        }

        $this->entityManager->flush();

        return [$totalRows, $addedAmount];
    }

    private function interpretStore(string $storeString): Store {
        $storeString = trim($storeString);
        $storeString = strtolower($storeString);
        $storeString = str_replace(' ', '', $storeString);

        $triedConversion = Store::tryFrom($storeString);
        if ($triedConversion !== null) {
            return $triedConversion;
        }

        if (array_key_exists($storeString, self::STORE_ADDITIONAL_CASES)) {
            return self::STORE_ADDITIONAL_CASES[$storeString];
        }

        return Store::EXTERNAL;
    }
}