<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\App;
use Symfony\Component\HttpFoundation\Response;

class SetLocale
{
    /**
     * Handle an incoming request.
     * Set the application locale based on priority:
     * user preference > tenant preference > session > browser > config default.
     */
    public function handle(Request $request, Closure $next): Response
    {
        $locale = null;
        $calendar = null;

        // 1. Session preference (highest priority - user just changed it)
        $locale = session('locale');
        $calendar = session('calendar');

        // 2. Authenticated user preference (database stored preference)
        if (!$locale && $request->user()) {
            $locale = $request->user()->getLocale();
            $calendar = $request->user()->getCalendar();
        }

        // 3. Tenant preference
        if (!$locale && session('tenant_id')) {
            $tenant = \App\Models\Tenant::find(session('tenant_id'));
            if ($tenant) {
                $locale = $locale ?? $tenant->default_locale;
                $calendar = $calendar ?? $tenant->default_calendar;
            }
        }

        // 4. Browser preference
        if (!$locale) {
            $browserLang = substr($request->getPreferredLanguage(), 0, 2);
            $supportedLocales = config('projectra.supported_locales', ['fa', 'en']);
            if (in_array($browserLang, $supportedLocales)) {
                $locale = $browserLang;
            }
        }

        // 5. Config default (lowest priority)
        if (!$locale) {
            $locale = config('projectra.default_locale', 'fa');
        }

        if (!$calendar) {
            $calendar = config('projectra.default_calendar', 'jalali');
        }

        // Set the application locale
        App::setLocale($locale);

        // Store in session for subsequent requests
        session(['locale' => $locale, 'calendar' => $calendar]);

        // Share locale, direction, and calendar with all views
        $rtlLocales = config('projectra.rtl_locales', ['fa', 'ar', 'he']);
        $direction = in_array($locale, $rtlLocales) ? 'rtl' : 'ltr';

        view()->share([
            'currentLocale' => $locale,
            'currentDirection' => $direction,
            'currentCalendar' => $calendar,
        ]);

        return $next($request);
    }
}