<?php

namespace App\Model\Sdf;

use Nette\Utils\FileSystem;
use Nette\Utils\Json;

class SdfCompactExporter
{
    public function __construct(
        private string $scriptPath,
        private string $sdfPassword
    ) {
    }

    /**
     * Přečte SQL Compact .sdf (Windows) nebo hotový JSON export a vrátí tabulky jako pole.
     *
     * @return array{uzivatel: array, zakaznik: array, faktura: array, polozka: array, platba: array, konfigurace: array}
     */
    public function export(string $sdfPath): array
    {
        if (!is_file($sdfPath)) {
            throw new \RuntimeException('SDF soubor nebyl nalezen.');
        }

        $extension = strtolower(pathinfo($sdfPath, PATHINFO_EXTENSION));
        if ($extension === 'json') {
            return $this->normalizeExport(Json::decode(FileSystem::read($sdfPath), forceArrays: true));
        }

        if (!is_file($this->scriptPath)) {
            throw new \RuntimeException('Exportní skript bin/sdf-export.ps1 chybí.');
        }

        $powershell = $this->findPowershell();
        if ($powershell === null) {
            throw new \RuntimeException(
                'Čtení .sdf vyžaduje Windows a PowerShell se SQL Server Compact 4.0. '
                . 'Na Linux serveru nejdřív na Windows spusťte bin/sdf-export.ps1 '
                . 'a nahrajte výsledný .json.'
            );
        }

        $workDir = dirname($sdfPath) . DIRECTORY_SEPARATOR . 'export-' . bin2hex(random_bytes(4));
        FileSystem::createDir($workDir);
        $outFile = $workDir . DIRECTORY_SEPARATOR . 'export.json';

        try {
            $this->runPowershell($powershell, $sdfPath, $outFile);
            $raw = FileSystem::read($outFile);
            return $this->normalizeExport(Json::decode($raw, forceArrays: true));
        } finally {
            FileSystem::delete($workDir);
        }
    }

    /**
     * @return array{uzivatel: array, zakaznik: array, faktura: array, polozka: array, platba: array, konfigurace: array}
     */
    private function normalizeExport(mixed $data): array
    {
        if (!is_array($data)) {
            throw new \RuntimeException('Export SDF nevrátil platná data.');
        }

        $hasTables = isset($data['uzivatel']) || isset($data['zakaznik']) || isset($data['faktura']);
        if (!$hasTables) {
            throw new \RuntimeException(
                'JSON nemá očekávanou strukturu exportu (uzivatel/zakaznik/faktura). '
                . 'Vygenerujte ho přes bin/sdf-export.ps1.'
            );
        }

        return [
            'uzivatel' => $data['uzivatel'] ?? [],
            'zakaznik' => $data['zakaznik'] ?? [],
            'faktura' => $data['faktura'] ?? [],
            'polozka' => $data['polozka'] ?? [],
            'platba' => $data['platba'] ?? [],
            'konfigurace' => $data['konfigurace'] ?? [],
        ];
    }

    private function runPowershell(string $powershell, string $sdfPath, string $outFile): void
    {
        $cmd = sprintf(
            '%s -NoProfile -NonInteractive -ExecutionPolicy Bypass -File %s -SdfPath %s -OutFile %s -Password %s',
            $this->winArg($powershell),
            $this->winArg($this->scriptPath),
            $this->winArg($sdfPath),
            $this->winArg($outFile),
            $this->winArg($this->sdfPassword)
        );

        $descriptor = [
            1 => ['pipe', 'w'],
            2 => ['pipe', 'w'],
        ];
        $process = proc_open($cmd, $descriptor, $pipes, null, null, ['bypass_shell' => false]);
        if (!is_resource($process)) {
            throw new \RuntimeException('Nepodařilo se spustit PowerShell pro čtení SDF.');
        }

        $stdout = stream_get_contents($pipes[1]);
        $stderr = stream_get_contents($pipes[2]);
        fclose($pipes[1]);
        fclose($pipes[2]);
        $code = proc_close($process);

        if ($code !== 0 || !is_file($outFile)) {
            $detail = trim($stderr . "\n" . $stdout);
            throw new \RuntimeException('Export SDF selhal' . ($detail !== '' ? ': ' . $detail : '.'));
        }
    }

    private function findPowershell(): ?string
    {
        if (PHP_OS_FAMILY !== 'Windows') {
            return null;
        }

        $candidates = [
            getenv('SystemRoot') . '\\System32\\WindowsPowerShell\\v1.0\\powershell.exe',
            'C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe',
        ];
        foreach ($candidates as $path) {
            if ($path && is_file($path)) {
                return $path;
            }
        }

        return 'powershell.exe';
    }

    private function winArg(string $value): string
    {
        return '"' . str_replace('"', '\\"', $value) . '"';
    }
}