<?php
declare(strict_types=1);

namespace Fendx\Web\Scanner;

use ReflectionClass;
use ReflectionMethod;
use ReflectionException;
use Fendx\Core\Annotation\Controller;
use Fendx\Web\Annotation\GetRoute;
use Fendx\Web\Annotation\PostRoute;
use Fendx\Web\Route\Router;

final class RouteScanner
{
    private Router $router;
    private array $controllers = [];

    public function __construct(Router $router)
    {
        $this->router = $router;
    }

    public function scan(string $scanPath): void
    {
        $this->scanControllers($scanPath);
        $this->registerRoutes();
    }

    private function scanControllers(string $path): void
    {
        if (!is_dir($path)) {
            return;
        }

        $files = glob($path . '/**/*.php');
        
        foreach ($files as $file) {
            $this->scanControllerFile($file);
        }
    }

    private function scanControllerFile(string $file): void
    {
        $className = $this->getClassNameFromFile($file);
        
        if ($className === null || class_exists($className) === false) {
            return;
        }

        try {
            $reflection = new ReflectionClass($className);
            
            // 检查是否有Controller注解
            $controllerAttributes = $reflection->getAttributes(Controller::class);
            if (empty($controllerAttributes)) {
                return;
            }

            $controllerAttribute = $controllerAttributes[0]->newInstance();
            $prefix = $controllerAttribute->prefix;

            // 扫描方法上的路由注解
            $this->scanControllerMethods($className, $reflection, $prefix);
            
        } catch (ReflectionException $e) {
            error_log("Failed to scan controller $className: " . $e->getMessage());
        }
    }

    private function scanControllerMethods(string $className, ReflectionClass $reflection, string $prefix): void
    {
        $methods = $reflection->getMethods(ReflectionMethod::IS_PUBLIC);
        
        foreach ($methods as $method) {
            if ($method->getName() === '__construct') {
                continue;
            }

            $this->scanMethodRoutes($className, $method, $prefix);
        }
    }

    private function scanMethodRoutes(string $className, ReflectionMethod $method, string $prefix): void
    {
        // 扫描GetRoute注解
        $getRouteAttributes = $method->getAttributes(GetRoute::class);
        foreach ($getRouteAttributes as $attribute) {
            $routeAttribute = $attribute->newInstance();
            $path = $prefix . $routeAttribute->path;
            $this->controllers[] = [
                'method' => 'GET',
                'path' => $path,
                'controller' => $className,
                'action' => $method->getName()
            ];
        }

        // 扫描PostRoute注解
        $postRouteAttributes = $method->getAttributes(PostRoute::class);
        foreach ($postRouteAttributes as $attribute) {
            $routeAttribute = $attribute->newInstance();
            $path = $prefix . $routeAttribute->path;
            $this->controllers[] = [
                'method' => 'POST',
                'path' => $path,
                'controller' => $className,
                'action' => $method->getName()
            ];
        }
    }

    private function registerRoutes(): void
    {
        foreach ($this->controllers as $route) {
            $handler = [$route['controller'], $route['action']];
            
            switch ($route['method']) {
                case 'GET':
                    $this->router->get($route['path'], $handler);
                    break;
                case 'POST':
                    $this->router->post($route['path'], $handler);
                    break;
                case 'PUT':
                    $this->router->put($route['path'], $handler);
                    break;
                case 'DELETE':
                    $this->router->delete($route['path'], $handler);
                    break;
            }
        }
    }

    private function getClassNameFromFile(string $file): ?string
    {
        $content = file_get_contents($file);
        
        if (preg_match('/namespace\s+([^;]+);/', $content, $matches)) {
            $namespace = trim($matches[1]);
            $className = basename($file, '.php');
            return $namespace . '\\' . $className;
        }

        return null;
    }

    public function getRoutes(): array
    {
        return $this->controllers;
    }
}