<?php

namespace App\Services;

use Illuminate\Support\Facades\Artisan;

class SystemFixService
{
    private array $results = [];

    public function checkAndFixAll(): array
    {
        $this->results = [];

        $this->checkPhpExtensions();
        $this->checkDatabase();
        $this->fixPermissions();
        $this->checkDiskSpace();
        $this->clearOldCaches();

        return $this->results;
    }

    private function checkPhpExtensions(): void
    {
        $requiredExtensions = ['pdo_mysql', 'curl', 'json', 'mbstring', 'xml', 'zip', 'bcmath'];
        $missing = [];

        foreach ($requiredExtensions as $ext) {
            if (! extension_loaded($ext)) {
                $missing[] = $ext;
            }
        }

        if ($missing === []) {
            $this->results[] = ['item' => 'PHP Extensions', 'status' => 'ok', 'message' => 'Alle vereiste extensies geïnstalleerd'];
        } else {
            $this->results[] = ['item' => 'PHP Extensions', 'status' => 'warning', 'message' => 'Ontbrekend: ' . implode(', ', $missing) . ' — installeer via: sudo apt install php-' . implode(' php-', $missing)];
        }
    }

    private function checkDatabase(): void
    {
        try {
            $host = setting('emulator_database_host', '127.0.0.1');
            $port = setting('emulator_database_port', '3306');
            $name = setting('emulator_database_name', config('database.connections.mysql.database', ''));
            $username = setting('emulator_database_username', config('database.connections.mysql.username', ''));
            $password = setting('emulator_database_password', config('database.connections.mysql.password', ''));

            if (empty($name) || empty($username)) {
                $this->results[] = ['item' => 'Emulator Database', 'status' => 'warning', 'message' => 'Niet geconfigureerd'];
                $this->autoFixEmulatorDatabase();

                return;
            }

            $validationErrors = $this->validateDatabaseInputs($host, $port, $name, $username);
            if ($validationErrors !== []) {
                $this->results[] = ['item' => 'Emulator Database', 'status' => 'error', 'message' => implode(', ', $validationErrors)];

                return;
            }

            try {
                $pdo = new \PDO(
                    "mysql:host={$host};port={$port};charset=utf8mb4",
                    $username,
                    $password,
                    [\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION, \PDO::ATTR_TIMEOUT => 5],
                );

                $pdo->exec("USE `{$name}`");
                $pdo->query('SELECT 1');
                $this->results[] = ['item' => 'Emulator Database', 'status' => 'ok', 'message' => "Verbonden met {$name}"];
            } catch (\PDOException $e) {
                $this->results[] = ['item' => 'Emulator Database', 'status' => 'error', 'message' => $e->getMessage()];
            }
        } catch (\Exception $e) {
            $this->results[] = ['item' => 'Emulator Database', 'status' => 'error', 'message' => $e->getMessage()];
        }
    }

    private function validateDatabaseInputs(string $host, string $port, string $name, string $username): array
    {
        $errors = [];

        if ($host === '' || $host === '0') {
            $errors[] = 'Host is leeg';
        } elseif (! filter_var($host, FILTER_VALIDATE_IP) && ! preg_match('/^[a-zA-Z0-9.-]+$/', $host)) {
            $errors[] = 'Ongeldige host';
        }

        if ($port === '' || $port === '0') {
            $errors[] = 'Port is leeg';
        } elseif (! is_numeric($port) || $port < 1 || $port > 65535) {
            $errors[] = 'Ongeldige port';
        }

        if ($name === '' || $name === '0') {
            $errors[] = 'Database naam is leeg';
        } elseif (! preg_match('/^\w+$/', $name)) {
            $errors[] = 'Ongeldige database naam';
        }

        if ($username === '' || $username === '0') {
            $errors[] = 'Gebruikersnaam is leeg';
        } elseif (! preg_match('/^\w+$/', $username)) {
            $errors[] = 'Ongeldige gebruikersnaam';
        }

        return $errors;
    }

    private function autoFixEmulatorDatabase(): void
    {
        $host = config('database.connections.mysql.host', '127.0.0.1');
        $port = config('database.connections.mysql.port', '3306');
        $name = config('database.connections.mysql.database', '');
        $username = config('database.connections.mysql.username', '');
        $password = config('database.connections.mysql.password', '');

        if (empty($name) || empty($username)) {
            $this->results[] = ['item' => 'Emulator Database Fix', 'status' => 'warning', 'message' => 'Kon geen geldige database vinden'];

            return;
        }

        $settings = app(SettingsService::class);
        $settings->set('emulator_database_host', $host);
        $settings->set('emulator_database_port', (string) $port);
        $settings->set('emulator_database_name', $name);
        $settings->set('emulator_database_username', $username);
        $settings->set('emulator_database_password', $password);

        $this->results[] = ['item' => 'Emulator Database Fix', 'status' => 'fixed', 'message' => "Automatisch gefixt: {$name}@{$host}"];
    }

    private function fixPermissions(): void
    {
        $directories = [
            storage_path(),
            storage_path('logs'),
            storage_path('framework'),
            storage_path('framework/cache'),
            storage_path('framework/sessions'),
            storage_path('framework/views'),
            bootstrap_path('cache'),
        ];

        $fixed = false;
        foreach ($directories as $dir) {
            if (! is_dir($dir)) {
                @mkdir($dir, 0775, true);
                $fixed = true;
            }

            if (is_writable($dir)) {
                continue;
            }

            @chmod($dir, 0775);
            $fixed = true;
        }

        $this->results[] = ['item' => 'Permissions', 'status' => $fixed ? 'fixed' : 'ok', 'message' => $fixed ? 'Permissions gefixt' : 'Al correct geconfigureerd'];
    }

    private function checkDiskSpace(): void
    {
        $total = disk_total_space('/');
        $free = disk_free_space('/');

        if ($total === false || $free === false) {
            $this->results[] = ['item' => 'Disk Space', 'status' => 'warning', 'message' => 'Kon schijfruimte niet bepalen'];

            return;
        }

        $usagePercent = (int) ((($total - $free) / $total) * 100);

        if ($usagePercent >= 90) {
            $this->results[] = ['item' => 'Disk Space', 'status' => 'error', 'message' => "Schijf {$usagePercent}% vol!"];
        } elseif ($usagePercent >= 75) {
            $this->results[] = ['item' => 'Disk Space', 'status' => 'warning', 'message' => "Schijf {$usagePercent}% gebruikt"];
        } else {
            $this->results[] = ['item' => 'Disk Space', 'status' => 'ok', 'message' => "Schijf {$usagePercent}% gebruikt"];
        }
    }

    private function clearOldCaches(): void
    {
        Artisan::call('cache:clear');
        Artisan::call('view:clear');
        Artisan::call('config:clear');

        $this->results[] = ['item' => 'Cache Cleanup', 'status' => 'fixed', 'message' => 'Caches opgeruimd'];
    }
}