<?php

namespace App\Http\Middleware;

use App\Domain\DomainContext;
use App\Services\DomainService;
use App\Services\Util;
use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Config;
use Illuminate\Support\Facades\Session;

/**
 * Enhanced Domain Resolver Middleware
 * 
 * This middleware replaces the current Subdomain middleware with a more
 * robust, maintainable solution that properly handles all domain types.
 */
class DomainResolver
{
    private DomainService $domainService;
    
    public function __construct(DomainService $domainService)
    {
        $this->domainService = $domainService;
    }
    
    /**
     * Handle an incoming request
     */
    public function handle(Request $request, Closure $next)
    {
        // Parse the domain from the request
        $host = $request->getHost();
        $domainInfo = $this->domainService->parseDomain($host);
        
        // Create domain context
        $context = $this->createDomainContext($request, $domainInfo);
        
        // Handle unknown domains
        if ($context->isUnknownDomain()) {
            return $this->handleUnknownDomain($request, $context);
        }
        
        // Set up the application context
        $this->setupApplicationContext($request, $context);
        
        // Store context in the application container
        app()->instance('domain.context', $context);
        
        return $next($request);
    }
    
    /**
     * Create domain context from parsed domain information
     */
    private function createDomainContext(Request $request, array $domainInfo): DomainContext
    {
        $userShop = null;
        
        // Load user shop for user-shop domains
        if ($domainInfo['type'] === 'user-shop' && $domainInfo['subdomain']) {
            $userShop = $this->domainService->getUserShop($domainInfo['subdomain']);
            
            // If user shop is invalid, mark as unknown
            if (!$userShop) {
                $domainInfo['type'] = 'unknown';
            }
        }
        
        // Handle main-shop domain with default shop
        if ($domainInfo['type'] === 'main-shop') {
            $userShop = $this->domainService->getDefaultUserShop();
        }
        
        return DomainContext::fromDomainInfo($domainInfo, $userShop);
    }
    
    /**
     * Handle unknown or invalid domains
     */
    private function handleUnknownDomain(Request $request, DomainContext $context)
    {
        // Log the invalid domain attempt
        \Log::warning('Unknown domain accessed', [
            'host' => $request->getHost(),
            'domain_info' => $context->toArray(),
            'user_agent' => $request->userAgent(),
            'ip' => $request->ip()
        ]);
        
        // Redirect to main domain
        $mainUrl = $this->domainService->buildUrl('main');
        return redirect($mainUrl, 301);
    }
    
    /**
     * Set up application context based on domain
     */
    private function setupApplicationContext(Request $request, DomainContext $context): void
    {
        switch ($context->type) {
            case 'user-shop':
                $this->setupUserShopContext($request, $context);
                break;
                
            case 'main-shop':
                $this->setupMainShopContext($request, $context);
                break;
                
            case 'crm':
                $this->setupCrmContext($request, $context);
                break;
                
            case 'portal':
                $this->setupPortalContext($request, $context);
                break;
                
            case 'checkout':
                $this->setupCheckoutContext($request, $context);
                break;
                
            case 'main':
                $this->setupMainContext($request, $context);
                break;
        }
        
        // Set up common configurations
        $this->setupCommonContext($request, $context);
    }
    
    /**
     * Set up context for user shop domains
     */
    private function setupUserShopContext(Request $request, DomainContext $context): void
    {
        if (!$context->userShop) {
            return;
        }
        
        // Set up session data (maintaining compatibility with current implementation)
        Session::put('user_shop', $context->userShop);
        Session::put('user_shop_domain', $context->fullDomain);
        
        // Set dynamic URL configuration
        Config::set('app.url', $context->fullDomain);
        
        // Set route prefix for utilities (maintaining compatibility)
        Util::setPostRoute('user/');
        
        // Remove subdomain parameter from route (maintaining compatibility)
        if ($request->route() && $request->route()->hasParameter('subdomain')) {
            $request->route()->forgetParameter('subdomain');
        }
    }
    
    /**
     * Set up context for main shop domain (mivita.shop)
     */
    private function setupMainShopContext(Request $request, DomainContext $context): void
    {
        if (!$context->userShop) {
            return;
        }
        
        // Set up session data similar to user shops
        Session::put('user_shop', $context->userShop);
        Session::put('user_shop_domain', $context->fullDomain);
        
        // Set dynamic URL configuration
        Config::set('app.url', $context->fullDomain);
        
        // Set route prefix
        Util::setPostRoute('user/');
    }
    
    /**
     * Set up context for CRM domain (my.mivita.care)
     */
    private function setupCrmContext(Request $request, DomainContext $context): void
    {
        // Set up CRM-specific configurations
        Config::set('app.url', $context->fullDomain);
        
        // Set session domain for cross-subdomain compatibility
        Config::set('session.domain', '.' . $context->domain . $context->tld);
    }
    
    /**
     * Set up context for portal domain (in.mivita.care)
     */
    private function setupPortalContext(Request $request, DomainContext $context): void
    {
        // Set up portal-specific configurations
        Config::set('app.url', $context->fullDomain);
        
        // Set session domain for cross-subdomain compatibility
        Config::set('session.domain', '.' . $context->domain . $context->tld);
    }
    
    /**
     * Set up context for checkout domain (checkout.mivita.care)
     */
    private function setupCheckoutContext(Request $request, DomainContext $context): void
    {
        // Set up checkout-specific configurations
        Config::set('app.url', $context->fullDomain);
        
        // Set session domain for cross-subdomain compatibility
        Config::set('session.domain', '.' . $context->domain . $context->tld);
    }
    
    /**
     * Set up context for main domain (mivita.care)
     */
    private function setupMainContext(Request $request, DomainContext $context): void
    {
        // Set up main domain configurations
        Config::set('app.url', $context->fullDomain);
    }
    
    /**
     * Set up common context configurations
     */
    private function setupCommonContext(Request $request, DomainContext $context): void
    {
        // Set up view namespace if applicable
        if ($namespace = $context->getViewNamespace()) {
            // This could be used by view composers or other components
            Config::set('view.domain_namespace', $namespace);
        }
        
        // Set up any domain-specific cache prefixes
        if ($context->isUserShopDomain()) {
            Config::set('cache.prefix', config('cache.prefix') . '_' . $context->getUserShopSlug());
        }
        
        // Set up CSRF token domain
        if (in_array($context->type, ['crm', 'portal', 'checkout'])) {
            Config::set('session.same_site', 'lax');
        }
    }
    
    /**
     * Validate that the domain is properly configured for this request
     */
    private function validateDomainConfiguration(DomainContext $context): bool
    {
        $errors = $this->domainService->validateConfiguration();
        
        if (!empty($errors)) {
            \Log::error('Domain configuration errors', [
                'errors' => $errors,
                'context' => $context->toArray()
            ]);
            return false;
        }
        
        return true;
    }
}