<?php

namespace App\Model\Facade;

use Nette\Database\Connection;
use Nette\Http\FileUpload;
use Nette\Utils\FileSystem;
use Nette\Utils\Json;

class DatabazeFacade
{
    public function __construct(
        private Connection $masterDb,
        private string $sdfStorageDir
    ) {
    }

    /**
     * Seznam databází z master tabulky LOGIN (jeden login = jedna databáze).
     *
     * @return \stdClass[]
     */
    public function getAll(): array
    {
        $rows = $this->masterDb->fetchAll(
            'SELECT ID, EMAIL, POSLEDNI_PRIHLASENI, AKTIVNI, [DATABASE], [SERVER], FIRMA_ID, IS_ADMIN
             FROM dbo.LOGIN
             ORDER BY [DATABASE], EMAIL'
        );

        $result = [];
        foreach ($rows as $row) {
            $result[] = $this->hydrate($row);
        }

        return $result;
    }

    public function getById(int $id): ?\stdClass
    {
        $row = $this->masterDb->fetch(
            'SELECT ID, EMAIL, POSLEDNI_PRIHLASENI, AKTIVNI, [DATABASE], [SERVER], FIRMA_ID, IS_ADMIN
             FROM dbo.LOGIN
             WHERE ID = ?',
            $id
        );

        return $row ? $this->hydrate($row) : null;
    }

    public function getSdfFilePath(int $loginId): ?string
    {
        $path = $this->sdfPath($loginId);
        return is_file($path) ? $path : null;
    }

    /**
     * @param array<string, mixed> $stats
     */
    public function markSdfImported(int $loginId, array $stats): void
    {
        $meta = $this->readSdfMeta($loginId);
        $meta['importedAt'] = (new \DateTimeImmutable())->format('c');
        $meta['importStats'] = $stats;
        FileSystem::createDir($this->sdfStorageDir);
        FileSystem::write($this->sdfMetaPath($loginId), Json::encode($meta, pretty: true));
    }

    /**
     * Položky selectu: ID => „databáze — e-mail“.
     *
     * @return array<int, string>
     */
    public function getSelectItems(): array
    {
        $items = [];
        foreach ($this->getAll() as $login) {
            $items[(int) $login->ID] = $login->DATABASE . ' — ' . $login->EMAIL;
        }

        return $items;
    }

    /**
     * Uloží nahraný .sdf k loginu.
     */
    public function saveSdf(int $loginId, FileUpload $file): void
    {
        $exists = $this->masterDb->fetchField('SELECT ID FROM dbo.LOGIN WHERE ID = ?', $loginId);
        if (!$exists) {
            throw new \InvalidArgumentException('Vybraná databáze (login) neexistuje.');
        }

        if (!$file->isOk()) {
            throw new \RuntimeException('Soubor se nepodařilo nahrát. Zkontrolujte velikost (limit PHP/upload).');
        }

        $extension = strtolower(pathinfo($file->getUntrustedName(), PATHINFO_EXTENSION));
        if ($extension !== 'sdf') {
            throw new \InvalidArgumentException('Soubor musí mít příponu .sdf.');
        }

        FileSystem::createDir($this->sdfStorageDir);

        $file->move($this->sdfPath($loginId));
        $this->clearSdfImportMeta($loginId);

        $meta = [
            'originalName' => $this->safeOriginalName($file->getUntrustedName()),
            'uploadedAt' => (new \DateTimeImmutable())->format('c'),
            'size' => $file->getSize(),
            'loginId' => $loginId,
        ];

        FileSystem::write($this->sdfMetaPath($loginId), Json::encode($meta, pretty: true));
    }

    /**
     * @return array{originalName?: string, uploadedAt?: string, size?: int}|array{}
     */
    private function readSdfMeta(int $loginId): array
    {
        $sdf = $this->sdfPath($loginId);
        if (!is_file($sdf)) {
            return [];
        }

        $metaFile = $this->sdfMetaPath($loginId);
        $meta = [];
        if (is_file($metaFile)) {
            try {
                $decoded = Json::decode(FileSystem::read($metaFile), forceArrays: true);
                $meta = is_array($decoded) ? $decoded : [];
            } catch (\Throwable) {
                $meta = [];
            }
        }

        $meta['size'] = filesize($sdf) ?: ($meta['size'] ?? null);
        $meta['uploadedAt'] ??= date('c', filemtime($sdf) ?: time());
        $meta['originalName'] ??= $loginId . '.sdf';

        return $meta;
    }

    private function hydrate(object $row): \stdClass
    {
        $item = (object) (array) $row;
        $meta = $this->readSdfMeta((int) $item->ID);
        $item->SDF_SOUBOR = $meta['originalName'] ?? null;
        $item->SDF_NAHRANO = isset($meta['uploadedAt']) ? new \DateTimeImmutable($meta['uploadedAt']) : null;
        $item->SDF_VELIKOST = $meta['size'] ?? null;
        $item->SDF_VELIKOST_TEXT = isset($meta['size']) ? $this->formatBytes((int) $meta['size']) : null;
        $item->SDF_IMPORTOVANO = isset($meta['importedAt']) ? new \DateTimeImmutable($meta['importedAt']) : null;
        return $item;
    }

    private function clearSdfImportMeta(int $loginId): void
    {
        $metaFile = $this->sdfMetaPath($loginId);
        if (!is_file($metaFile)) {
            return;
        }
        try {
            $decoded = Json::decode(FileSystem::read($metaFile), forceArrays: true);
            $meta = is_array($decoded) ? $decoded : [];
        } catch (\Throwable) {
            return;
        }
        unset($meta['importedAt'], $meta['importStats']);
        FileSystem::write($metaFile, Json::encode($meta, pretty: true));
    }

    private function sdfPath(int $loginId): string
    {
        return $this->sdfStorageDir . DIRECTORY_SEPARATOR . $loginId . '.sdf';
    }

    private function sdfMetaPath(int $loginId): string
    {
        return $this->sdfStorageDir . DIRECTORY_SEPARATOR . $loginId . '.json';
    }

    private function formatBytes(int $bytes): string
    {
        if ($bytes < 1024) {
            return $bytes . ' B';
        }
        if ($bytes < 1024 * 1024) {
            return number_format($bytes / 1024, 1, ',', ' ') . ' KB';
        }

        return number_format($bytes / (1024 * 1024), 1, ',', ' ') . ' MB';
    }

    private function safeOriginalName(string $name): string
    {
        $name = str_replace(["\0", "\r", "\n"], '', $name);
        $name = basename($name);

        return $name !== '' ? mb_substr($name, 0, 255) : 'databaze.sdf';
    }
}