<?php

declare(strict_types=1);

namespace App\Http\Controllers;

use App\Models\CalendarioConnessione;
use App\Services\CalDavService;
use App\Services\GoogleCalendarSyncService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;

class CalendarioConnessioneController extends Controller
{
    public function store(Request $request): RedirectResponse
    {
        $this->authorizeWrite('settings');

        $data = $request->validate([
            'nome' => 'required|string|max:255',
            'tipo' => 'required|in:google_calendar,caldav',
            'sync_direction' => 'nullable|in:import,export,bidirectional',
            'sync_interval_minutes' => 'nullable|integer|min:5|max:1440',
            'is_active' => 'boolean',
            'config' => 'nullable|array',
        ]);

        $maxOrdine = CalendarioConnessione::max('ordine') ?? 0;

        $connessione = new CalendarioConnessione();
        $connessione->nome = $data['nome'];
        $connessione->tipo = $data['tipo'];
        $connessione->sync_direction = $data['sync_direction'] ?? 'bidirectional';
        $connessione->sync_interval_minutes = $data['sync_interval_minutes'] ?? 60;
        $connessione->is_active = $request->boolean('is_active', true);
        $connessione->stato = 'disconnesso';
        $connessione->ordine = $maxOrdine + 1;
        $connessione->encryptAndSetConfig($data['config'] ?? []);
        $connessione->save();

        return redirect('/impostazioni#calendario')->with('success', 'Connessione calendario "' . $connessione->nome . '" creata.');
    }

    public function update(Request $request, int $id): RedirectResponse
    {
        $this->authorizeWrite('settings');

        $connessione = CalendarioConnessione::findOrFail($id);

        $data = $request->validate([
            'nome' => 'required|string|max:255',
            'tipo' => 'required|in:google_calendar,caldav',
            'sync_direction' => 'nullable|in:import,export,bidirectional',
            'sync_interval_minutes' => 'nullable|integer|min:5|max:1440',
            'is_active' => 'boolean',
            'config' => 'nullable|array',
        ]);

        $connessione->nome = $data['nome'];
        $connessione->tipo = $data['tipo'];
        $connessione->sync_direction = $data['sync_direction'] ?? 'bidirectional';
        $connessione->sync_interval_minutes = $data['sync_interval_minutes'] ?? 60;
        $connessione->is_active = $request->boolean('is_active', true);

        if (!empty($data['config'])) {
            $connessione->encryptAndSetConfig($data['config']);
        }

        $connessione->save();

        return redirect('/impostazioni#calendario')->with('success', 'Connessione calendario "' . $connessione->nome . '" aggiornata.');
    }

    public function destroy(int $id): JsonResponse
    {
        $this->authorizeDelete('settings');
        $connessione = CalendarioConnessione::findOrFail($id);
        $connessione->delete();

        return response()->json(['success' => true, 'message' => 'Connessione calendario eliminata.']);
    }

    public function test(int $id): JsonResponse
    {
        $this->authorizeWrite('settings');
        $connessione = CalendarioConnessione::findOrFail($id);

        $result = match ($connessione->tipo) {
            'caldav' => app(CalDavService::class)->testConnection($connessione),
            'google_calendar' => app(GoogleCalendarSyncService::class)->testConnection($connessione),
            default => ['success' => false, 'message' => 'Tipo sconosciuto'],
        };

        if ($result['success']) {
            $connessione->update(['stato' => 'connesso', 'last_error_at' => null, 'last_error_message' => null]);
        } else {
            $connessione->update(['stato' => 'errore', 'last_error_at' => now(), 'last_error_message' => $result['message'] ?? 'Errore sconosciuto']);
        }

        return response()->json($result);
    }

    public function sync(int $id): RedirectResponse
    {
        $this->authorizeWrite('settings');
        $connessione = CalendarioConnessione::findOrFail($id);

        $result = match ($connessione->tipo) {
            'caldav' => app(CalDavService::class)->syncEvents($connessione),
            'google_calendar' => app(GoogleCalendarSyncService::class)->syncEvents($connessione),
            default => ['success' => false, 'imported' => 0, 'exported' => 0, 'errors' => ['Tipo sconosciuto']],
        };

        $connessione->update(['last_sync_at' => now()]);

        if ($result['success']) {
            $msg = 'Sincronizzazione completata: ' . $result['imported'] . ' importati, ' . $result['exported'] . ' esportati.';
            $connessione->update(['stato' => 'connesso']);
            return redirect('/impostazioni#calendario')->with('success', $msg);
        }

        $errorMsg = implode('; ', $result['errors']);
        $connessione->update(['stato' => 'errore', 'last_error_at' => now(), 'last_error_message' => $errorMsg]);

        return redirect('/impostazioni#calendario')->with('error', 'Errore sync: ' . $errorMsg);
    }

    public function syncAll(): JsonResponse
    {
        $this->authorizeWrite('settings');

        $connections = CalendarioConnessione::where('is_active', true)->get();
        $results = [];

        foreach ($connections as $connessione) {
            $result = match ($connessione->tipo) {
                'caldav' => app(CalDavService::class)->syncEvents($connessione),
                'google_calendar' => app(GoogleCalendarSyncService::class)->syncEvents($connessione),
                default => ['success' => false, 'imported' => 0, 'exported' => 0, 'errors' => ['Tipo sconosciuto']],
            };

            $connessione->update(['last_sync_at' => now()]);

            if ($result['success']) {
                $connessione->update(['stato' => 'connesso']);
            } else {
                $errorMsg = implode('; ', $result['errors']);
                $connessione->update(['stato' => 'errore', 'last_error_at' => now(), 'last_error_message' => $errorMsg]);
            }

            $results[] = [
                'id' => $connessione->id,
                'nome' => $connessione->nome,
                'success' => $result['success'],
                'imported' => $result['imported'],
                'exported' => $result['exported'],
                'errors' => $result['errors'],
            ];
        }

        $totalImported = array_sum(array_column($results, 'imported'));
        $totalExported = array_sum(array_column($results, 'exported'));
        $hasErrors = in_array(false, array_column($results, 'success'), true);

        return response()->json([
            'success' => !$hasErrors,
            'results' => $results,
            'total_imported' => $totalImported,
            'total_exported' => $totalExported,
            'connections' => count($results),
        ]);
    }

    public function reorder(Request $request): JsonResponse
    {
        $this->authorizeWrite('settings');
        $order = $request->input('order', []);
        foreach ($order as $index => $id) {
            CalendarioConnessione::where('id', $id)->update(['ordine' => $index]);
        }
        return response()->json(['success' => true]);
    }
}