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<?php

/**
 * This file is part of the Lean Mapper library (http://www.leanmapper.com)
 *
 * Copyright (c) 2013 Vojtěch Kohout (aka Tharos)
 *
 * For the full copyright and license information, please view the file
 * license-mit.txt that was distributed with this source code.
 */

namespace LeanMapper\Reflection;

use LeanMapper\Exception\InvalidStateException;
use LeanMapper\IMapper;
use ReflectionMethod;

/**
 * Entity reflection
 *
 * @author Vojtěch Kohout
 */
class EntityReflection extends \ReflectionClass
{

    /** @var IMapper */
    private $mapper;

    /** @var Property[] */
    private $properties;

    /** @var array */
    private $getters;

    /** @var array */
    private $setters;

    /** @var array */
    private $aliases;

    /** @var string */
    private $docComment;

    /** @var array */
    private $internalGetters = array('getData', 'getRowData', 'getModifiedRowData', 'getCurrentReflection', 'getReflection', 'getHasManyRowDifferences', 'getEntityClass');


    /**
     * @param mixed $argument
     * @param IMapper|null $mapper
     */
    public function __construct($argument, IMapper $mapper = null)
    {
        parent::__construct($argument);
        $this->mapper = $mapper;
        $this->parseProperties();
        $this->initGettersAndSetters();
    }

    /**
     * Gets requested entity's property
     *
     * @param string $name
     * @return Property|null
     */
    public function getEntityProperty($name)
    {
        return isset($this->properties[$name]) ? $this->properties[$name] : null;
    }

    /**
     * Gets array of all entity's properties
     *
     * @return Property[]
     */
    public function getEntityProperties()
    {
        return $this->properties;
    }

    /**
     * Gets Aliases instance relevant to current class
     *
     * @return Aliases
     */
    public function getAliases()
    {
        if ($this->aliases === null) {
            $this->aliases = AliasesParser::parseSource(file_get_contents($this->getFileName()), $this->getNamespaceName());
        }
        return $this->aliases;
    }

    /**
     * Gets parent entity's reflection
     *
     * @return self|null
     */
    public function getParentClass()
    {
        return ($reflection = parent::getParentClass()) ? new self($reflection->getName()) : null;
    }

    /**
     * Gets doc comment of current class
     *
     * @return string
     */
    public function getDocComment()
    {
        if ($this->docComment === null) {
            $this->docComment = parent::getDocComment();
        }
        return $this->docComment;
    }

    /**
     * Gets requested getter's reflection
     *
     * @param string $name
     * @return ReflectionMethod|null
     */
    public function getGetter($name)
    {
        return isset($this->getters[$name]) ? $this->getters[$name] : null;
    }

    /**
     * Gets array of getter's reflections
     *
     * @return ReflectionMethod[]
     */
    public function getGetters()
    {
        return $this->getters;
    }

    /**
     * Gets requested setter's reflection
     *
     * @param string $name
     * @return ReflectionMethod|null
     */
    public function getSetter($name)
    {
        return isset($this->setters[$name]) ? $this->setters[$name] : null;
    }

    ////////////////////
    ////////////////////

    /**
     * @throws InvalidStateException
     */
    private function parseProperties()
    {
        $this->properties = array();
        $annotationTypes = array('property', 'property-read');
        $columns = array();
        foreach ($this->getFamilyLine() as $member) {
            foreach ($annotationTypes as $annotationType) {
                foreach (AnnotationsParser::parseAnnotationValues($annotationType, $member->getDocComment()) as $definition) {
                    $property = PropertyFactory::createFromAnnotation($annotationType, $definition, $this, $this->mapper);
                    // collision check
                    $column = $property->getColumn();
                    if ($column !== null and $property->isWritable()) {
                        if (isset($columns[$column])) {
                            throw new InvalidStateException("Mapping collision on property '{$property->getName()}' (column '$column'). Please fix mapping or make chosen properties read only (using property-read).");
                        }
                        $columns[$column] = true;
                    }
                    $this->properties[$property->getName()] = $property;
                }
            }
        }
    }

    private function initGettersAndSetters()
    {
        $this->getters = $this->setters = array();
        foreach ($this->getMethods(ReflectionMethod::IS_PUBLIC) as $method) {
            $name = $method->getName();
            if (strlen($name) > 3) {
                $prefix = substr($name, 0, 3);
                if ($prefix === 'get') {
                    $this->getters[$name] = $method;
                } elseif ($prefix === 'set') {
                    $this->setters[$name] = $method;
                }
            }
        }
        $this->getters = array_diff_key($this->getters, array_flip($this->internalGetters));
    }

    /**
     * @return self[]
     */
    private function getFamilyLine()
    {
        $line = array($member = $this);
        while ($member = $member->getParentClass()) {
            if ($member->name === 'LeanMapper\Entity') break;
            $line[] = $member;
        }
        return array_reverse($line);
    }

}