<?php
declare(strict_types=1);


namespace HttpServer\Route;


use Annotation\Route\Middleware;
use Closure;
use HttpServer\Abstracts\HttpService;
use HttpServer\Controller;
use HttpServer\Http\Request;
use Exception;

use HttpServer\HttpFilter;
use HttpServer\IInterface\After;
use HttpServer\IInterface\Interceptor;
use HttpServer\IInterface\Limits;
use HttpServer\Route\Dispatch\Dispatch;
use JetBrains\PhpStorm\Pure;
use ReflectionException;
use Snowflake\Core\Json;
use Snowflake\Event;
use Snowflake\Exception\ComponentException;
use Snowflake\Exception\NotFindClassException;
use Snowflake\Snowflake;
use Throwable;
use validator\Validator;
use function Input;

/**
 * Class Node
 * @package Snowflake\Snowflake\Route
 */
class Node extends HttpService
{

    public string $path = '';
    public int $index = 0;
    public string $method = '';

    /** @var Node[] $childes */
    public array $childes = [];

    public array $group = [];

    private string $_error = '';

    public array $rules = [];

    /** @var ?Closure|?array */
    public Closure|array|null $handler;
    public string $htmlSuffix = '.html';
    public bool $enableHtmlSuffix = false;
    public array $namespace = [];
    public array $middleware = [];

    /** @var array|Closure */
    public Closure|array $callback = [];

    private string $_alias = '';

    private array $_interceptors = [];
    private array $_after = [];
    private array $_limits = [];

    /**
     * @param $handler
     * @return Node
     * @throws
     */
    public function bindHandler($handler): static
    {
        if (is_string($handler) && str_contains($handler, '@')) {
            list($controller, $action) = explode('@', $handler);
            if (!empty($this->namespace)) {
                $controller = implode('\\', $this->namespace) . '\\' . $controller;
            }
            $this->handler = $this->getReflect($controller, $action);
        } else if ($handler != null && !is_callable($handler, true)) {
            $this->_error = 'Controller is con\'t exec.';
        } else if ($handler instanceof Closure) {
            $this->handler = $handler;
        } else {
            [$controller, $action] = $this->handler = $handler;
            if (!($controller instanceof Controller)) {
                return $this;
            }
            $this->annotationInject(get_class($controller), $action);
        }
        if (!empty($this->handler)) {
            $this->callback = Reduce::reduce($this->createDispatch(), $this->annotation());
        }
        return $this;
    }


    /**
     * @return Closure
     */
    public function createDispatch(): Closure
    {
        return function () {
            return Dispatch::create($this->handler, func_get_args())->dispatch();
        };
    }


    /**
     * @return array
     */
    protected function annotation(): array
    {
        $middleWares = $this->getMiddleWares();
        $middleWares = $this->annotation_limit($this, $middleWares);
        $middleWares = $this->annotation_interceptor($this, $middleWares);
        return $middleWares;
    }


    /**
     * @param Node $node
     * @param $middleWares
     * @return array
     */
    protected function annotation_interceptor(Node $node, $middleWares = []): array
    {
        if (!$node->hasInterceptor()) {
            return $middleWares;
        }
        foreach ($node->getInterceptor() as $item) {
            $middleWares[] = $item;
        }
        return $middleWares;
    }


    /**
     * @param Node $node
     * @param $middleWares
     * @return array
     */
    protected function annotation_limit(Node $node, $middleWares = []): array
    {
        if (!$node->hasLimits()) {
            return $middleWares;
        }
        foreach ($node->getLimits() as $item) {
            $middleWares[] = $item;
        }
        return $middleWares;
    }


    /**
     * @return bool
     */
    #[Pure] public function hasInterceptor(): bool
    {
        return count($this->_interceptors) > 0;
    }


    /**
     * @return bool
     */
    #[Pure] public function hasLimits(): bool
    {
        return count($this->_limits) > 0;
    }


    /**
     * @param null $response
     * @return mixed
     */
    public function afterDispatch($response = null): mixed
    {
        if (is_object($this->_after[0])) {
            return call_user_func($this->_after, \request(), $response);
        }
        foreach ($this->_after as $value) {
            call_user_func($value, \request(), $response);
        }
        return $this->_after;
    }


    /**
     * @return array
     */
    public function getInterceptor(): array
    {
        return $this->_interceptors;
    }


    /**
     * @return array
     */
    public function getAfters(): array
    {
        return $this->_after;
    }


    /**
     * @return bool
     */
    #[Pure] public function hasAfter(): bool
    {
        return count($this->_after) > 0;
    }


    /**
     * @return array
     */
    public function getLimits(): array
    {
        return $this->_limits;
    }

    /**
     * @param $request
     * @return bool
     */
    public function methodAllow(Request $request): bool
    {
        if ($this->method == $request->getMethod()) {
            return true;
        }
        return $this->method == 'any';
    }

    /**
     * @return bool
     * @throws Exception
     */
    public function checkSuffix(): bool
    {
        if ($this->enableHtmlSuffix) {
            $url = request()->getUri();
            $nowLength = strlen($this->htmlSuffix);
            if (strpos($url, $this->htmlSuffix) !== strlen($url) - $nowLength) {
                return false;
            }
        }
        return $this->checkRule();
    }

    /**
     * @return bool
     * @throws Exception
     */
    private function checkRule(): bool
    {
        if (empty($this->rules)) {
            return true;
        }
        foreach ($this->rules as $rule) {
            if (!isset($rule['class'])) {
                $rule['class'] = Filter::class;
            }
            /** @var Filter $object */
            $object = Snowflake::createObject($rule);
            if (!$object->handler()) {
                return false;
            }
        }
        return true;
    }

    /**
     * @param string $controller
     * @param string $action
     * @return null|array
     * @throws Exception
     */
    private function getReflect(string $controller, string $action): ?array
    {
        try {
            $reflect = Snowflake::getDi()->getReflect($controller);
            if (empty($reflect)) {
                throw new Exception($controller . ' Class is con\'t Instantiable.');
            }
            if (!empty($action) && !$reflect->hasMethod($action)) {
                throw new Exception('method ' . $action . ' not exists at ' . $controller . '.');
            }

            $this->annotationInject($reflect->getName(), $action);

            return [$reflect->newInstance(), $action];
        } catch (Throwable $exception) {
            $this->_error = $exception->getMessage();
            $this->addError($exception, 'router');
            return null;
        }
    }


    /**
     * @param Closure|array|string $handler
     * @throws Exception
     */
    public function addInterceptor(Closure|string|array $handler)
    {
        if (!is_array($handler) || is_object($handler[0])) {
            $handler = [$handler];
        }
        foreach ($handler as $closure) {
            if (in_array($closure, $this->_interceptors)) {
                continue;
            }
            $this->_interceptors[] = $closure;
        }
    }


    /**
     * @param string $className
     * @param string $action
     * @return Node
     * @throws Exception
     */
    public function annotationInject(string $className, string $action): Node
    {
        $annotation = annotation()->getMethods($className, $action);
        if (empty($annotation)) {
            return $this;
        }
        foreach ($annotation as $name => $attribute) {
            if ($attribute instanceof \Annotation\Route\Interceptor) {
                $this->addInterceptor($attribute->interceptor);
            }
            if ($attribute instanceof \Annotation\Route\After) {
                $this->addAfter($attribute->after);
            }
            if ($attribute instanceof Middleware) {
                $this->addMiddleware($attribute->middleware);
            }
            if ($attribute instanceof \Annotation\Route\Limits) {
                $this->addLimits($attribute->limits);
            }
        }
        return $this;
    }


    /**
     * @param Closure|array|string $handler
     * @throws Exception
     */
    public function addAfter(Closure|string|array $handler)
    {
        if (!is_array($handler) || is_object($handler[0])) {
            $handler = [$handler];
        }
        foreach ($handler as $closure) {
            if (in_array($closure, $this->_after)) {
                continue;
            }
            $this->_after[] = $closure;
        }
    }


    /**
     * @param Closure|array|string $handler
     * @throws Exception
     */
    public function addLimits(Closure|string|array $handler)
    {
        if (!is_array($handler) || is_object($handler[0])) {
            $handler = [$handler];
        }
        foreach ($handler as $closure) {
            if (in_array($closure, $this->_limits)) {
                continue;
            }
            $this->_limits[] = $closure;
        }
    }


    /**
     * @return string
     * 错误信息
     */
    public function getError(): string
    {
        return $this->_error;
    }

    /**
     * @param Node $node
     * @param string $field
     * @return Node
     */
    public function addChild(Node $node, string $field): Node
    {
        $field = (string)$field;
        /** @var Node $oLod */
        $oLod = $this->childes[$field] ?? null;
        if (!empty($oLod)) {
            $node = $oLod;
        }
        $this->childes[$field] = $node;
        return $this->childes[$field];
    }


    /**
     * @param string $search
     * @return Node|null
     */
    public function findNode(string $search): ?Node
    {
        if (empty($this->childes)) {
            return null;
        }

        if (isset($this->childes[$search])) {
            return $this->childes[$search];
        }

        $_searchMatch = '/<(\w+)?:(.+)?>/';
        foreach ($this->childes as $key => $val) {
            if (preg_match($_searchMatch, (string)$key, $match)) {
                Input()->addGetParam($match[1] ?? '--', $search);
                return $this->childes[$key];
            }
        }
        return null;
    }


    /**
     * @param string $alias
     * @return $this
     * 别称
     */
    public function alias(string $alias): static
    {
        $this->_alias = $alias;
        return $this;
    }


    /**
     * @return string
     */
    public function getAlias(): string
    {
        return $this->_alias;
    }


    /**
     * @param array|Closure|string $class
     * @return Node
     * @throws ReflectionException
     * @throws NotFindClassException
     * @throws Exception
     */
    public function addMiddleware(Closure|array $class): static
    {
        if (empty($class)) return $this;
        foreach ($class as $closure) {
            if (in_array($closure, $this->middleware)) {
                continue;
            }
            $this->middleware[] = $closure;
        }
        return $this;
    }


    /**
     * @return array
     */
    public function getMiddleWares(): array
    {
        return $this->middleware;
    }


    /**
     * @return mixed
     * @throws Exception
     */
    public function dispatch(): mixed
    {
        if (empty($this->callback)) {
            return Json::to(404, $this->errorMsg());
        }
        return $this->httpFilter(...func_get_args());
    }


    /**
     * @return mixed
     * @throws Exception
     */
    private function httpFilter(): mixed
    {
        try {
            if ($this->handler instanceof Closure) {
                return $this->runWith(...func_get_args());
            }

            /** @var HttpFilter $filter */
            $filter = Snowflake::app()->get('filter');
            $validator = $filter->check(get_class($this->handler[0]), $this->handler[1]);
            if (!($validator instanceof Validator)) {
                return $this->runWith(...func_get_args());
            }

            if (!$validator->validation()) {
                return Json::to(401, $validator->getError());
            }
            return $this->runWith(...func_get_args());
        } catch (Throwable $throwable) {
            $this->addError($throwable, 'throwable');
            return Json::to(401, $throwable->getMessage());
        }
    }


    /**
     * @return mixed
     * @throws Exception
     */
    private function runWith(): mixed
    {
        $requestParams = func_get_args();
        if (func_num_args() > 0) {
            return call_user_func($this->callback, ...$requestParams);
        } else {
            return call_user_func($this->callback, \request());
        }
    }


    /**
     * @return string
     */
    private function errorMsg(): string
    {
        return $this->_error ?? 'Page not found.';
    }

}