<?php

namespace App\Http\Middleware;

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

class SetTenant
{
    /**
     * Handle an incoming request.
     * Resolve the tenant from the subdomain, store in session, and share with views.
     */
    public function handle(Request $request, Closure $next): Response
    {
        $host = $request->getHost();
        $parts = explode('.', $host);

        // Skip for the main domain (e.g., Vernova.test or www.Vernova.test)
        $mainDomain = config('Vernova.main_domain', env('APP_DOMAIN'));

        if ($mainDomain && ($host === $mainDomain || $host === 'www.' . $mainDomain)) {
            // Even on main domain, try to set tenant from authenticated user
            $this->setTenantFromUser();
            return $next($request);
        }

        // Try to resolve tenant from subdomain
        if (count($parts) > 2 || (count($parts) === 2 && $parts[1] === $mainDomain)) {
            $subdomain = $parts[0];

            // Skip 'www' subdomain
            if ($subdomain === 'www') {
                $this->setTenantFromUser();
                return $next($request);
            }

            $tenant = Tenant::where('slug', $subdomain)
                ->where('is_active', true)
                ->first();

            if (!$tenant) {
                abort(404, 'Tenant not found.');
            }

            session(['tenant_id' => $tenant->id]);
            session(['tenant' => $tenant]);

            // Share tenant with all views
            view()->share('currentTenant', $tenant);

            return $next($request);
        }

        // Try to get tenant from session if already set
        $tenantId = session('tenant_id');

        if ($tenantId) {
            $tenant = Tenant::find($tenantId);

            if ($tenant && $tenant->is_active) {
                view()->share('currentTenant', $tenant);
                return $next($request);
            }
        }

        // Try to resolve tenant from domain directly
        $tenant = Tenant::where('domain', $host)
            ->where('is_active', true)
            ->first();

        if ($tenant) {
            session(['tenant_id' => $tenant->id]);
            session(['tenant' => $tenant]);
            view()->share('currentTenant', $tenant);

            return $next($request);
        }

        // Fallback: try to set tenant from authenticated user
        $this->setTenantFromUser();

        return $next($request);
    }

    /**
     * Set tenant from the currently authenticated user.
     * This is a fallback for localhost/XAMPP environments where
     * subdomain-based tenant resolution doesn't work.
     */
    protected function setTenantFromUser(): void
    {
        // Only if tenant_id is not already in session
        if (session('tenant_id')) {
            $tenant = Tenant::find(session('tenant_id'));
            if ($tenant && $tenant->is_active) {
                view()->share('currentTenant', $tenant);
                return;
            }
        }

        $user = Auth::user();

        if ($user && $user->tenant_id) {
            $tenant = Tenant::find($user->tenant_id);

            if ($tenant && $tenant->is_active) {
                session(['tenant_id' => $tenant->id]);
                session(['tenant' => $tenant]);
                view()->share('currentTenant', $tenant);
            }
        }
    }
}