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<?php

    namespace Inlm\Mappers;

    use LeanMapper\Caller;
    use LeanMapper\IMapper;
    use LeanMapper\Row;


    class PrefixMapper implements IMapper
    {
        /** @var string */
        protected $prefix;

        /** @var IMapper */
        protected $fallback;

        /** @var int */
        protected $prefixLength;


        /**
         * @param  string|NULL
         */
        public function __construct($prefix = '', IMapper $fallback = NULL)
        {
            $this->prefix = (string) $prefix;
            $this->prefixLength = strlen($prefix);
            $this->fallback = $fallback ? $fallback : new \LeanMapper\DefaultMapper;
        }


        /**
         * @inheritdoc
         */
        public function getPrimaryKey($table)
        {
            return $this->fallback->getPrimaryKey($this->removePrefix($table));
        }


        /**
         * @inheritdoc
         */
        public function getTable($entityClass)
        {
            return $this->prefix . $this->fallback->getTable($entityClass);
        }


        /**
         * @inheritdoc
         */
        public function getEntityClass($table, Row $row = NULL)
        {
            return $this->fallback->getEntityClass($this->removePrefix($table), $row);
        }


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


        /**
         * @inheritdoc
         */
        public function getEntityField($table, $column)
        {
            return $this->fallback->getEntityField($this->removePrefix($table), $column);
        }


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


        /**
         * @inheritdoc
         */
        public function getRelationshipColumn($sourceTable, $targetTable)
        {
            return $this->fallback->getRelationshipColumn($this->removePrefix($sourceTable), $this->removePrefix($targetTable));
        }


        /**
         * @inheritdoc
         */
        public function getTableByRepositoryClass($repositoryClass)
        {
            return $this->prefix . $this->fallback->getTableByRepositoryClass($repositoryClass);
        }


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


        /**
         * @param  string
         * @return string
         */
        protected function removePrefix($table)
        {
            if ($this->prefix !== '' && strncmp($this->prefix, $table, $this->prefixLength) === 0) {
                return substr($table, $this->prefixLength);
            }

            return $table;
        }
    }