<?php


namespace Annotation;


use Exception;
use ReflectionAttribute;
use ReflectionClass;
use ReflectionException;
use ReflectionMethod;
use Snowflake\Abstracts\Component;
use Snowflake\Exception\NotFindClassException;
use Snowflake\Exception\NotFindPropertyException;
use Snowflake\Snowflake;

/**
 * Class Annotation
 * @package Annotation
 */
class Annotation extends Component
{

    private array $_annotations = [];


    private array $_classes = [];


    private array $_targets = [];


    private array $_methods = [];


    /**
     * @param array $handler
     * @param $name
     */
    public function addMethodAttribute(array $handler, $name)
    {
        $this->_methods[get_class($handler[0])][$name] = $handler;
    }


    /**
     * @param string $className
     * @return array 根据类名获取注解
     * 根据类名获取注解
     */
    public function getMethods(string $className): array
    {
        return $this->_methods[$className] ?? [];
    }


    /**
     * @param string $path
     * @param string $namespace
     * @param string $alias
     * @return $this
     * @throws ReflectionException|NotFindPropertyException
     */
    public function readControllers(string $path, string $namespace, string $alias = 'root'): static
    {
        return $this->scanDir(glob($path . '*'), $namespace, $alias);
    }


    /**
     * @param string $alias
     * @return array
     */
    public function getAlias(string $alias = 'root'): array
    {
        if (!isset($this->_annotations[$alias])) {
            return [];
        }
        return $this->_annotations[$alias];
    }


    /**
     * @param array $paths
     * @param string $namespace
     * @param string $alias
     * @return $this
     * @throws ReflectionException|NotFindPropertyException
     * @throws NotFindClassException
     */
    private function scanDir(array $paths, string $namespace, string $alias): static
    {
        if (!isset($this->_annotations[$alias])) {
            $this->_annotations[$alias] = [];
        }
        foreach ($paths as $path) {
            $explode = explode('/', $path);

            $explode_pop = array_pop($explode);
            if (is_file($path)) {
                if (!str_contains($path, '.php')) {
                    continue;
                }
                $explode_pop = str_replace('.php', '', $explode_pop);
                $this->getReflect($namespace . '\\' . $explode_pop, $alias);
            } else {
                $this->scanDir(glob($path . '/*'), $namespace . '\\' . $explode_pop, $alias);
            }
        }
        return $this;
    }


    /**
     * @param string $class
     * @param string $alias
     * @return array
     * @throws Exception
     */
    private function getReflect(string $class, string $alias): array
    {
        try {
            $reflect = $this->reflectClass($class);
            var_dump($reflect, $class);
            if (empty($reflect) || !$reflect->isInstantiable()) {
                return [];
            }
            $object = $reflect->newInstance();
            $this->resolveMethod($reflect, $class, $alias, $object);
            return $this->targets($reflect);
        } catch (\Throwable $throwable) {
            $this->addError($throwable);
            return [];
        }
    }


    /**
     * @param ReflectionClass $reflect
     * @param $class
     * @param $alias
     * @param $object
     * @throws NotFindPropertyException
     */
    private function resolveMethod(ReflectionClass $reflect, $class, $alias, $object)
    {
        foreach ($reflect->getMethods(ReflectionMethod::IS_PUBLIC) as $method) {
            if ($method->class != $class) {
                continue;
            }
            $this->resolveAnnotations($method, $alias, $object);
        }
        $this->resolveProperty($reflect, $object);
    }


    /**
     * @param ReflectionClass $reflectionClass
     * @param $object
     * @throws NotFindPropertyException
     */
    private function resolveProperty(ReflectionClass $reflectionClass, $object)
    {
        $property = $reflectionClass->getProperties();
        foreach ($property as $value) {
            if ($value->isStatic()) continue;
            $attributes = $value->getAttributes();
            if (count($attributes) < 1) {
                continue;
            }
            foreach ($attributes as $attribute) {
                /** @var IAnnotation $annotation */
                $annotation = $this->instance($attribute);
                if (empty($annotation)) {
                    continue;
                }
                $annotation = $annotation->execute([$object, $value->getName()]);
                if ($value->isPublic()) {
                    $object->{$value->getName()} = $annotation;
                } else {
                    $name = 'set' . ucfirst($value->getName());
                    if (!method_exists($object, $name)) {
                        throw new NotFindPropertyException('set property need method ' . $name);
                    }
                    $object->$name($annotation);
                }
            }
        }
    }


    /**
     * @param string $class
     * @return ReflectionClass|null
     * @throws ReflectionException
     * @throws NotFindClassException
     */
    private function reflectClass(string $class): ?ReflectionClass
    {
        return Snowflake::getDi()->getReflect($class);
    }


    /**
     * @param ReflectionMethod $method
     * @param $alias
     * @param $object
     * @return array
     */
    private function resolveAnnotations(ReflectionMethod $method, $alias, $object): array
    {
        $attributes = $method->getAttributes();
        if (count($attributes) < 1) {
            return [];
        }

        foreach ($attributes as $attribute) {
            /** @var IAnnotation $class */
            $class = $this->instance($attribute);
            if ($class === null) {
                continue;
            }
            $class->execute([$object, $method->getName()]);
        }

//        $tmp['handler'] = [$object, $method->getName()];
//        $tmp['attributes'] = $names;
//
//        $this->_annotations[$alias][] = $tmp;

        return [];
    }


    /**
     * @param $className
     * @param string $method
     * @return array
     */
    public function getByClass($className, $method = ''): array
    {
        if (!isset($this->_classes[$className])) {
            return [];
        }
        if (empty($method)) {
            return $this->_classes[$className];
        }
        foreach ($this->_classes[$className] as $_method => $class) {
            if ($method == $_method) {
                return [$class];
            }
        }
        return [];
    }


    /**
     * @param ReflectionClass $reflect
     * @return array
     */
    private function targets(ReflectionClass $reflect): array
    {
        $name = $reflect->getName();
        if (!isset($this->_classes[$name])) {
            $this->_classes[$name] = [];
        }
        $attributes = $reflect->getAttributes();
        if (count($attributes) > 0) {
            if (!isset($this->_targets[$name])) {
                $this->_targets[$name] = [];
            }
            foreach ($attributes as $attribute) {
                $class = $this->instance($attribute);
                if ($class === null) {
                    continue;
                }
                $this->_targets[$name][] = $class;
            }
        }
        return [];
    }


    /**
     * @param ReflectionAttribute $attribute
     * @return array|object|null
     */
    private function instance(ReflectionAttribute $attribute): array|object|null
    {
        if (!class_exists($attribute->getName())) {
            return null;
        }
        return $attribute->newInstance();
    }


}