<?php

declare(strict_types=1);

namespace ProxyManager\ProxyGenerator\Util;

use ReflectionClass;
use ReflectionProperty;

/**
 * DTO containing the list of all non-static proxy properties and utility methods to access them
 * in various formats/collections
 *
 * @author Marco Pivetta <ocramius@gmail.com>
 * @license MIT
 */
final class Properties
{
    /**
     * @var array|\ReflectionProperty[]
     */
    private $properties;

    /**
     * @param ReflectionProperty[] $properties
     */
    private function __construct(array $properties)
    {
        $this->properties = $properties;
    }

    public static function fromReflectionClass(ReflectionClass $reflection) : self
    {
        $class      = $reflection;
        $properties = [];

        do {
            $properties = array_merge(
                $properties,
                array_values(array_filter(
                    $class->getProperties(),
                    function (ReflectionProperty $property) use ($class) : bool {
                        return $class->getName() === $property->getDeclaringClass()->getName()
                            && ! $property->isStatic();
                    }
                ))
            );
        } while ($class = $class->getParentClass());

        return new self($properties);
    }

    /**
     * @param string[] $excludedProperties
     */
    public function filter(array $excludedProperties) : self
    {
        $properties = $this->getInstanceProperties();

        foreach ($excludedProperties as $propertyName) {
            unset($properties[$propertyName]);
        }

        return new self($properties);
    }

    /**
     * @return ReflectionProperty[] indexed by the property internal visibility-aware name
     */
    public function getPublicProperties() : array
    {
        $publicProperties = [];

        foreach ($this->properties as $property) {
            if ($property->isPublic()) {
                $publicProperties[$property->getName()] = $property;
            }
        }

        return $publicProperties;
    }

    /**
     * @return ReflectionProperty[] indexed by the property internal visibility-aware name (\0*\0propertyName)
     */
    public function getProtectedProperties() : array
    {
        $protectedProperties = [];

        foreach ($this->properties as $property) {
            if ($property->isProtected()) {
                $protectedProperties["\0*\0" . $property->getName()] = $property;
            }
        }

        return $protectedProperties;
    }

    /**
     * @return ReflectionProperty[] indexed by the property internal visibility-aware name (\0ClassName\0propertyName)
     */
    public function getPrivateProperties() : array
    {
        $privateProperties = [];

        foreach ($this->properties as $property) {
            if ($property->isPrivate()) {
                $declaringClass = $property->getDeclaringClass()->getName();

                $privateProperties["\0" . $declaringClass . "\0" . $property->getName()] = $property;
            }
        }

        return $privateProperties;
    }

    /**
     * @return ReflectionProperty[] indexed by the property internal visibility-aware name (\0*\0propertyName)
     */
    public function getAccessibleProperties() : array
    {
        return array_merge($this->getPublicProperties(), $this->getProtectedProperties());
    }

    /**
     * @return ReflectionProperty[][] indexed by class name and property name
     */
    public function getGroupedPrivateProperties() : array
    {
        $propertiesMap = [];

        foreach ($this->getPrivateProperties() as $property) {
            $class = & $propertiesMap[$property->getDeclaringClass()->getName()];

            $class[$property->getName()] = $property;
        }

        return $propertiesMap;
    }

    /**
     * @return ReflectionProperty[] indexed by the property internal visibility-aware name (\0*\0propertyName)
     */
    public function getInstanceProperties() : array
    {
        return array_merge($this->getAccessibleProperties(), $this->getPrivateProperties());
    }
}