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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;

use LeanMapper\Exception\InvalidStateException;

/**
 * Default IMapper implementation
 *
 * @author Vojtěch Kohout
 */
class DefaultMapper implements IMapper
{

    /** @var string */
    protected $defaultEntityNamespace = 'Model\Entity';

    /** @var string */
    protected $relationshipTableGlue = '_';


    /*
     * @inheritdoc
     */
    public function getPrimaryKey($table)
    {
        return 'id';
    }

    /*
     * @inheritdoc
     */
    public function getTable($entityClass)
    {
        return strtolower($this->trimNamespace($entityClass));
    }

    /*
     * @inheritdoc
     */
    public function getEntityClass($table, Row $row = null)
    {
        return ($this->defaultEntityNamespace !== null ? $this->defaultEntityNamespace . '\\' : '') . ucfirst($table);
    }

    /*
     * @inheritdoc
     */
    public function getColumn($entityClass, $field)
    {
        return $field;
    }

    /*
     * @inheritdoc
     */
    public function getEntityField($table, $column)
    {
        return $column;
    }

    /*
     * @inheritdoc
     */
    public function getRelationshipTable($sourceTable, $targetTable)
    {
        return $sourceTable . $this->relationshipTableGlue . $targetTable;
    }

    /*
     * @inheritdoc
     */
    public function getRelationshipColumn($sourceTable, $targetTable)
    {
        return $targetTable . '_' . $this->getPrimaryKey($targetTable);
    }

    /*
     * @inheritdoc
     */
    public function getTableByRepositoryClass($repositoryClass)
    {
        $matches = array();
        if (preg_match('#([a-z0-9]+)repository$#i', $repositoryClass, $matches)) {
            return strtolower($matches[1]);
        }
        throw new InvalidStateException('Cannot determine table name.');
    }

    /*
     * @inheritdoc
     */
    public function getImplicitFilters($entityClass, Caller $caller = null)
    {
        return array();
    }

    /**
     * Trims namespace part from fully qualified class name
     *
     * @param $class
     * @return string
     */
    protected function trimNamespace($class)
    {
        $class = explode('\\', $class);
        return end($class);
    }

}