<?php

namespace App\Http\Controllers;

use App\Models\Setting;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Symfony\Component\Process\Process;

class SystemStatusController extends Controller
{
    public function __invoke(Request $request): JsonResponse
    {
        $user = $request->user();
        if (!$user || !$user->roles()->where('name', 'ROLE_ADMIN')->exists()) {
            return response()->json(['message' => 'Forbidden'], 403);
        }

        $phpDefaultPath = $this->resolveBinary('php');
        $phpConfiguredPath = trim((string) Setting::where('key', 'system.php_binary')->value('value'));
        $phpSelectedPath = $phpConfiguredPath ?: (PHP_BINARY ?: $phpDefaultPath);
        $phpSelectedOk = (bool) $phpSelectedPath;
        $phpSelectedVersion = $phpSelectedPath
            ? ($this->resolvePhpVersion($phpSelectedPath) ?? PHP_VERSION)
            : PHP_VERSION;
        $minVersions = $this->resolveMinVersions();
        $composerPath = $this->resolveBinary('composer');
        $nodePath = $this->resolveBinary('node');
        $npmPath = $this->resolveBinary('npm');
        $tarPath = $this->resolveBinary('tar');
        $rsyncPath = $this->resolveBinary('rsync');
        $procFunctions = [
            'proc_open',
            'proc_get_status',
            'proc_close',
        ];
        $disabledFunctions = array_filter(array_map('trim', explode(',', (string) ini_get('disable_functions'))));
        $disabledLookup = array_fill_keys($disabledFunctions, true);
        $procFunctionStatus = [];
        foreach ($procFunctions as $function) {
            $procFunctionStatus[$function] = function_exists($function) && !isset($disabledLookup[$function]);
        }

        return response()->json([
            'php' => PHP_VERSION,
            'php_default' => $phpDefaultPath,
            'php_configured' => $phpConfiguredPath ?: null,
            'php_selected_path' => $phpSelectedPath,
            'php_selected_ok' => $phpSelectedOk,
            'php_selected_version' => $phpSelectedVersion,
            'min_versions' => $minVersions,
            'composer' => $composerPath,
            'composer_version' => $this->resolveBinaryVersion($composerPath, ['--version']),
            'node' => $nodePath,
            'node_version' => $this->resolveBinaryVersion($nodePath, ['--version']),
            'npm' => $npmPath,
            'npm_version' => $this->resolveBinaryVersion($npmPath, ['--version']),
            'tar' => $tarPath,
            'tar_version' => $this->resolveBinaryVersion($tarPath, ['--version']),
            'rsync' => $rsyncPath,
            'rsync_version' => $this->resolveBinaryVersion($rsyncPath, ['--version']),
            'proc_functions' => $procFunctionStatus,
            'storage_writable' => is_writable(storage_path()),
            'updates_writable' => is_writable(storage_path('app/updates')) || @mkdir(storage_path('app/updates'), 0755, true),
        ]);
    }

    private function resolveBinary(string $name): ?string
    {
        $process = new Process(['sh', '-lc', "command -v {$name}"]);
        $process->setTimeout(5);
        $process->run();

        if (!$process->isSuccessful()) {
            return null;
        }

        $output = trim($process->getOutput());
        return $output !== '' ? $output : null;
    }

    private function resolvePhpVersion(string $path): ?string
    {
        $process = new Process([$path, '-r', 'echo PHP_VERSION;']);
        $process->setTimeout(5);
        $process->run();

        if (!$process->isSuccessful()) {
            return null;
        }

        $output = trim($process->getOutput());
        return $output !== '' ? $output : null;
    }

    private function resolveBinaryVersion(?string $path, array $args): ?string
    {
        if (!$path) {
            return null;
        }

        $process = new Process(array_merge([$path], $args));
        $process->setTimeout(5);
        $process->run();

        if (!$process->isSuccessful()) {
            return null;
        }

        $output = trim($process->getOutput());
        if ($output === '') {
            return null;
        }

        $line = strtok($output, "\n") ?: $output;
        if (preg_match('/(\\d+\\.\\d+(?:\\.\\d+)?)/', $line, $matches)) {
            return $matches[1];
        }

        return null;
    }

    private function resolveMinVersions(): array
    {
        $composerJson = $this->readJson(base_path('composer.json'));
        $packageJson = $this->readJson(base_path('package.json'));

        $php = $composerJson['require']['php'] ?? null;
        $node = $packageJson['engines']['node'] ?? null;
        $npm = $packageJson['engines']['npm'] ?? null;
        $composer = $composerJson['require']['composer-runtime-api'] ?? null;

        return [
            'php' => is_string($php) ? $php : null,
            'node' => is_string($node) ? $node : null,
            'npm' => is_string($npm) ? $npm : null,
            'composer' => is_string($composer) ? $composer : null,
        ];
    }

    private function readJson(string $path): array
    {
        if (!is_file($path)) {
            return [];
        }

        $contents = file_get_contents($path);
        if ($contents === false) {
            return [];
        }

        $data = json_decode($contents, true);
        return is_array($data) ? $data : [];
    }
}