<?php

declare(strict_types=1);

namespace App\Console\Commands;

use App\Models\EmailSetting;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\Crypt;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Schema;

class DiagnoseEmail extends Command
{
    protected $signature = 'diagnose:email';

    protected $description = 'Diagnostica configurazione email e credenziali';

    public function handle(): int
    {
        $this->info('=== Diagnostica Email Settings ===');
        $this->newLine();

        // 1. APP_KEY
        $this->section('APP_KEY');
        $appKey = config('app.key');
        if ($appKey && str_starts_with($appKey, 'base64:')) {
            $this->line('APP_KEY: presente e valida ✓');
        } elseif ($appKey) {
            $this->warn('APP_KEY: presente ma non in formato base64 (potrebbe funzionare lo stesso)');
        } else {
            $this->error('APP_KEY: NON IMPOSTATA — crittografia password non funzionerà!');
        }

        // 2. Tabella email_settings
        $this->newLine();
        $this->section('Tabella email_settings');
        if (Schema::hasTable('email_settings')) {
            $this->line('Tabella email_settings: esiste ✓');
            $columns = Schema::getColumnListing('email_settings');
            $this->line('Colonne: ' . implode(', ', $columns));

            $required = ['imap_host', 'imap_username', 'imap_password', 'email_address'];
            $missing = array_diff($required, $columns);
            if ($missing) {
                $this->error('Colonne mancanti: ' . implode(', ', $missing));
            } else {
                $this->line('Colonne richieste presenti ✓');
            }
        } else {
            $this->error('Tabella email_settings NON ESISTE! Esegui: php artisan migrate');
        }

        // 3. Record email_settings
        $this->newLine();
        $this->section('Record email_settings');
        $settings = EmailSetting::first();
        if ($settings) {
            $this->line('Record trovato (ID: ' . $settings->id . ')');
            $this->line('  imap_host: ' . ($settings->imap_host ?: 'VUOTO'));
            $this->line('  imap_username: ' . ($settings->imap_username ?: 'VUOTO'));
            $this->line('  imap_password: ' . ($settings->imap_password ? '[CRITTATO]' : 'VUOTO'));
            $this->line('  email_address: ' . ($settings->email_address ?: 'VUOTO'));
            $this->line('  smtp_host: ' . ($settings->smtp_host ?: 'VUOTO'));

            // Prova decrittazione
            if ($settings->imap_password) {
                try {
                    $decrypted = Crypt::decryptString($settings->imap_password);
                    $this->line('  -> password IMAP decrittata: ' . (strlen($decrypted) > 0 ? 'OK (' . strlen($decrypted) . ' caratteri)' : 'VUOTA'));
                } catch (\Exception $e) {
                    $this->error('  -> ERRORE decrittazione password IMAP: ' . $e->getMessage());
                    $this->warn('    Causa probabile: APP_KEY diversa da quando è stata salvata.');
                }
            }
        } else {
            $this->warn('NESSUN record in email_settings — nessuna configurazione salvata.');
            $this->line('Vai su /impostazioni#email-imap, compila e clicca "Salva Impostazioni Email"');
        }

        // 4. Tabella sender_accounts
        $this->newLine();
        $this->section('Tabella sender_accounts');
        if (Schema::hasTable('sender_accounts')) {
            $this->line('Tabella sender_accounts: esiste ✓');
            $count = DB::table('sender_accounts')->count();
            $this->line('Record presenti: ' . $count);
        } else {
            $this->error('Tabella sender_accounts NON ESISTE!');
        }

        // 5. Log recenti
        $this->newLine();
        $this->section('Errori recenti (storage/logs/laravel.log)');
        $logPath = storage_path('logs/laravel.log');
        if (file_exists($logPath)) {
            $lines = $this->getLastErrorLines($logPath, 20);
            if ($lines) {
                foreach ($lines as $line) {
                    $this->line($line);
                }
            } else {
                $this->line('Nessun errore recente trovato.');
            }
        } else {
            $this->warn('File di log non trovato: ' . $logPath);
        }

        // 6. Estensioni PHP
        $this->newLine();
        $this->section('Estensioni PHP');
        $requiredExts = ['openssl', 'json', 'mbstring', 'pdo', 'fileinfo'];
        foreach ($requiredExts as $ext) {
            if (extension_loaded($ext)) {
                $this->line($ext . ': OK ✓');
            } else {
                $this->error($ext . ': MANCANTE!');
            }
        }

        $this->newLine();
        $this->info('=== Diagnostica completata ===');

        return self::SUCCESS;
    }

    private function section(string $title): void
    {
        $this->line("--- {$title} ---");
    }

    private function getLastErrorLines(string $path, int $maxLines): array
    {
        $lines = [];
        $fp = fopen($path, 'r');
        if (!$fp) {
            return $lines;
        }

        fseek($fp, -1, SEEK_END);
        $pos = ftell($fp);
        $buffer = '';

        while ($pos > 0 && count($lines) < $maxLines) {
            $char = fgetc($fp);
            if ($char === "\n") {
                if (trim($buffer) !== '') {
                    $lines[] = trim($buffer);
                }
                $buffer = '';
            } else {
                $buffer = $char . $buffer;
            }
            $pos--;
            fseek($fp, $pos);
        }

        if (trim($buffer) !== '') {
            $lines[] = trim($buffer);
        }

        fclose($fp);

        return $lines;
    }
}