<?php

namespace App\Http\Controllers\Admin;

use App\Enums\GoogleService;
use App\Http\Controllers\Controller;
use App\Models\EmailAttachment;
use App\Models\EmailFolder;
use App\Models\EmailSetting;
use App\Models\Firma;
use App\Models\SenderAccount;
use App\Services\GoogleOAuthService;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Crypt;
use Illuminate\Support\Facades\Storage;
use Symfony\Component\Mime\Address;
use Symfony\Component\Mime\Email;

class EmailSettingsController extends Controller
{
    public function index()
    {
        $this->authorizeWrite('settings');
        $settings = EmailSetting::first() ?? new EmailSetting();
        $senderAccounts = SenderAccount::orderBy('email_address')->get();
        $googleStatus = app(GoogleOAuthService::class)->getConnectionStatus();
        $firme = $settings->exists ? $settings->firme : collect();
        return view('admin.email-settings.index', compact('settings', 'senderAccounts', 'googleStatus', 'firme'));
    }

    public function save(Request $request)
    {
        $this->authorizeWrite('settings');
        $validated = $request->validate([
            'imap_host' => 'required|string|max:255',
            'imap_port' => 'required|integer|min:1|max:65535',
            'imap_encryption' => 'nullable|in:ssl,tls,none',
            'imap_username' => 'required|string|max:255',
            'imap_password' => 'nullable|string',
            'smtp_host' => 'nullable|string|max:255',
            'smtp_port' => 'nullable|integer|min:1|max:65535',
            'smtp_encryption' => 'nullable|in:ssl,tls,none',
            'smtp_username' => 'nullable|string|max:255',
            'smtp_password' => 'nullable|string',
            'email_address' => 'required|email',
            'email_name' => 'nullable|string|max:255',
            'from_email' => 'nullable|email|max:255',
            'from_name' => 'nullable|string|max:255',
            'reply_to' => 'nullable|email',
            'sync_interval_minutes' => 'nullable|integer|min:1|max:60',
            'is_active' => 'boolean',
            'signature' => 'nullable|string',
            'signature_enabled' => 'boolean',
            'auth_method' => 'nullable|in:password,oauth',
            'google_oauth_connection_id' => 'nullable|integer|exists:google_oauth_connections,id',
        ]);

        if (!empty($validated['imap_password'])) {
            $validated['imap_password'] = Crypt::encryptString($validated['imap_password']);
        } else {
            unset($validated['imap_password']);
        }
        if (!empty($validated['smtp_password'])) {
            $validated['smtp_password'] = Crypt::encryptString($validated['smtp_password']);
        } else {
            unset($validated['smtp_password']);
        }

        $saved = EmailSetting::updateOrCreate(
            ['id' => $request->id ?? 1],
            $validated
        );

        $verify = EmailSetting::find($saved->id);

        $allGood = $verify &&
            $verify->imap_host === $validated['imap_host'] &&
            $verify->email_address === $validated['email_address'];

        $allGood = $allGood &&
            (!array_key_exists('signature', $validated) || $verify->signature === $validated['signature']) &&
            (!array_key_exists('signature_enabled', $validated) || (bool)$verify->signature_enabled === (bool)$validated['signature_enabled']);

        if ($allGood) {
            return back()->with('success', 'Impostazioni email salvate e verificate nel database.');
        } else {
            return back()->with('error', 'Errore nel salvataggio: i dati non sono stati salvati correttamente.');
        }
    }

    public function testConnection(Request $request)
    {
        $this->authorizeWrite('settings');
        $settings = EmailSetting::first();

        if (!$settings) {
            return response()->json(['success' => false, 'message' => 'Configurazione non trovata.']);
        }

        if (empty($settings->imap_host) || empty($settings->email_address)) {
            return response()->json(['success' => false, 'message' => 'Prima salva le impostazioni.']);
        }

        try {
            $result = $settings->testConnection();
            return response()->json($result);
        } catch (\Exception $e) {
            $msg = $e->getMessage();
            if (strpos($msg, 'Undefined property') !== false) {
                $msg = 'Impossibile connettersi al server IMAP. Verifica host, porta, encryption e credenziali.';
            }
            return response()->json(['success' => false, 'message' => 'Errore: ' . $msg]);
        }
    }

    public function testSmtp(Request $request)
    {
        $this->authorizeWrite('settings');
        $request->validate([
            'email' => 'required|email',
        ]);

        $settings = EmailSetting::first();

        if (!$settings) {
            return response()->json(['success' => false, 'message' => 'Configurazione non trovata.']);
        }

        try {
            $mailer = $settings->getSmtpMailer();

            if ($mailer === null) {
                return response()->json(['success' => false, 'message' => 'Impossibile creare il mailer SMTP. Verifica la configurazione.']);
            }

            $smtpUser = $settings->smtp_username ?: $settings->email_address;
            $fromName = $settings->getEffectiveFromName();
            $replyToEmail = $settings->from_email ?: $smtpUser;

            $email = (new Email())
                ->from(Address::create($smtpUser, $fromName))
                ->to($request->email)
                ->subject('Test Configurazione SMTP - Glastree')
                ->text('Test email da Glastree - Configurazione SMTP funziona!');

            if ($replyToEmail !== $smtpUser) {
                $email->replyTo(Address::create($replyToEmail, $fromName));
            }

            $mailer->send($email);

            \Illuminate\Support\Facades\Log::info('Test SMTP ok', ['to' => $request->email, 'from' => $settings->email_address]);

            return response()->json(['success' => true, 'message' => 'Email di test inviata a ' . $request->email]);
        } catch (\Exception $e) {
            \Illuminate\Support\Facades\Log::error('Test SMTP failed', ['error' => $e->getMessage()]);
            return response()->json(['success' => false, 'message' => 'Errore invio: ' . $e->getMessage()]);
        }
    }

    public function syncNow()
    {
        $this->authorizeWrite('settings');
        $settings = EmailSetting::getActive();

        if (!$settings) {
            return back()->with('error', 'Nessuna configurazione email attiva.');
        }

        try {
            app(\App\Http\Controllers\EmailController::class)->syncEmails();
            $settings->update(['last_sync_at' => now()]);
            return back()->with('success', 'Sincronizzazione completata.');
        } catch (\Exception $e) {
            return back()->with('error', 'Errore sync: ' . $e->getMessage());
        }
    }

    public function senderStore(Request $request)
    {
        $this->authorizeWrite('settings');
        $data = $request->validate([
            'email_address' => 'required|email|max:255|unique:sender_accounts,email_address',
            'email_name' => 'nullable|string|max:255',
            'smtp_host' => 'nullable|string|max:255',
            'smtp_port' => 'nullable|integer|min:1|max:65535',
            'smtp_encryption' => 'nullable|in:tls,ssl,none',
            'smtp_username' => 'nullable|string|max:255',
            'smtp_password' => 'nullable|string',
            'reply_to' => 'nullable|email|max:255',
            'verify_email' => 'nullable|email|max:255',
            'note' => 'nullable|string|max:500',
            'is_active' => 'boolean',
            'auth_method' => 'nullable|in:password,oauth',
            'google_oauth_connection_id' => 'nullable|integer|exists:google_oauth_connections,id',
        ]);

        if (!empty($data['smtp_password'])) {
            $data['smtp_password'] = Crypt::encryptString($data['smtp_password']);
        } else {
            unset($data['smtp_password']);
        }

        $sender = SenderAccount::create($data);

        return back()->with('success', 'Mittente "' . $sender->email_address . '" creato con successo.');
    }

    public function senderUpdate(Request $request, int $id)
    {
        $this->authorizeWrite('settings');
        $sender = SenderAccount::findOrFail($id);

        $data = $request->validate([
            'email_address' => 'required|email|max:255|unique:sender_accounts,email_address,' . $id,
            'email_name' => 'nullable|string|max:255',
            'smtp_host' => 'nullable|string|max:255',
            'smtp_port' => 'nullable|integer|min:1|max:65535',
            'smtp_encryption' => 'nullable|in:tls,ssl,none',
            'smtp_username' => 'nullable|string|max:255',
            'smtp_password' => 'nullable|string',
            'reply_to' => 'nullable|email|max:255',
            'verify_email' => 'nullable|email|max:255',
            'note' => 'nullable|string|max:500',
            'is_active' => 'boolean',
            'auth_method' => 'nullable|in:password,oauth',
            'google_oauth_connection_id' => 'nullable|integer|exists:google_oauth_connections,id',
        ]);

        if (!empty($data['smtp_password'])) {
            $data['smtp_password'] = Crypt::encryptString($data['smtp_password']);
        } else {
            unset($data['smtp_password']);
        }

        $sender->update($data);

        return back()->with('success', 'Mittente "' . $sender->email_address . '" aggiornato.');
    }

    public function senderDestroy(int $id)
    {
        $this->authorizeDelete('settings');
        $sender = SenderAccount::findOrFail($id);
        $sender->delete();

        if (request()->expectsJson()) {
            return response()->json(['success' => true, 'message' => 'Mittente eliminato.']);
        }

        return back()->with('success', 'Mittente eliminato.');
    }

    public function destroy(): RedirectResponse
    {
        $this->authorizeDelete('settings');

        EmailAttachment::chunk(100, function ($attachments) {
            foreach ($attachments as $attachment) {
                if ($attachment->file_path && Storage::exists($attachment->file_path)) {
                    Storage::delete($attachment->file_path);
                }
            }
        });

        EmailFolder::whereIn('type', ['inbox', 'sent', 'drafts', 'trash', 'archive', 'starred'])->each(function ($folder) {
            $folder->delete();
        });

        $settings = EmailSetting::first();
        if ($settings) {
            $settings->delete();
        }

        return redirect('/impostazioni/email')->with('success', 'Configurazione email eliminata. Messaggi, cartelle e allegati rimossi completamente.');
    }

    public function senderTestSmtp(Request $request, int $id)
    {
        $this->authorizeWrite('settings');
        $request->validate(['email' => 'required|email']);

        $sender = SenderAccount::findOrFail($id);

        try {
            $sender->sendEmail(
                $request->email,
                'Test Configurazione SMTP - ' . config('app.name'),
                'Test email da ' . config('app.name') . ' - Configurazione SMTP mittente "' . $sender->email_address . '" funziona!'
            );

            return response()->json(['success' => true, 'message' => 'Email di test inviata a ' . $request->email]);
        } catch (\Exception $e) {
            return response()->json(['success' => false, 'message' => 'Errore invio: ' . $e->getMessage()]);
        }
    }

    public function firmaStore(Request $request)
    {
        $this->authorizeWrite('settings');
        $data = $request->validate([
            'nome' => 'required|string|max:255',
            'contenuto_html' => 'nullable|string',
            'is_default' => 'boolean',
        ]);

        $settings = EmailSetting::getActive();
        if (!$settings) {
            return redirect('/impostazioni/email')->with('error', 'Account email non configurato.');
        }

        $firma = $settings->firme()->create($data);

        if ($data['is_default'] ?? false) {
            $settings->firme()->where('id', '!=', $firma->id)->update(['is_default' => false]);
        }

        return redirect('/impostazioni/email#firme')->with('success', 'Firma "' . $firma->nome . '" creata.');
    }

    public function firmaUpdate(Request $request, int $id)
    {
        $this->authorizeWrite('settings');
        $data = $request->validate([
            'nome' => 'required|string|max:255',
            'contenuto_html' => 'nullable|string',
            'is_default' => 'boolean',
        ]);

        $firma = Firma::findOrFail($id);
        $firma->update($data);

        if ($data['is_default'] ?? false) {
            Firma::where('email_setting_id', $firma->email_setting_id)
                ->where('id', '!=', $firma->id)
                ->update(['is_default' => false]);
        }

        return redirect('/impostazioni/email#firme')->with('success', 'Firma "' . $firma->nome . '" aggiornata.');
    }

    public function firmaSetDefault(int $id)
    {
        $this->authorizeWrite('settings');
        $firma = Firma::findOrFail($id);
        Firma::where('email_setting_id', $firma->email_setting_id)->update(['is_default' => false]);
        $firma->update(['is_default' => true]);
        return redirect('/impostazioni/email#firme')->with('success', 'Firma "' . $firma->nome . '" impostata come predefinita.');
    }

    public function firmaDestroy(int $id)
    {
        $this->authorizeWrite('settings');
        $firma = Firma::findOrFail($id);
        $nome = $firma->nome;
        $firma->delete();
        return redirect('/impostazioni/email#firme')->with('success', 'Firma "' . $nome . '" eliminata.');
    }
}