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<?php

    namespace Inlm\Mappers;

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


    class DynamicMapper implements IMapper
    {
        /** @var IMapper */
        protected $fallback;

        /** @var array  [tableName => entityClass] */
        protected $tableToEntity;

        /** @var array  [tableName => primaryKey] */
        protected $tablePrimaryKey;

        /** @var array  [entityClass => tableName] */
        protected $entityToTable;

        /** @var array  [repositoryClass => tableName] */
        protected $repositoryToTable;


        public function __construct(IMapper $fallback = NULL)
        {
            $this->fallback = $fallback ? $fallback : new \LeanMapper\DefaultMapper;
        }


        /**
         * @param  string|NULL  table name in database
         * @param  string|NULL
         * @param  string|NULL
         * @param  string|NULL
         * @return static
         */
        public function setMapping($tableName, $entityClass = NULL, $repositoryClass = NULL, $primaryKey = NULL)
        {
            if (isset($this->tableToEntity[$tableName])) {
                throw new DuplicateException("Table '$tableName' is already registered for entity " . $this->tableToEntity[$tableName]);
            }

            if (isset($entityClass, $this->entityToTable[$entityClass])) {
                throw new DuplicateException("Entity $entityClass is already registered for table '{$this->entityToTable[$entityClass]}'");
            }

            if (isset($repositoryClass, $this->repositoryToTable[$repositoryClass])) {
                throw new DuplicateException("Repository $repositoryClass is already registered for table '{$this->repositoryToTable[$repositoryClass]}'");
            }

            if (is_string($entityClass)) {
                $this->tableToEntity[$tableName] = $entityClass;
                $this->entityToTable[$entityClass] = $tableName;
            }

            if (is_string($repositoryClass)) {
                $this->repositoryToTable[$repositoryClass] = $tableName;
            }

            if (is_string($primaryKey)) {
                $this->tablePrimaryKey[$tableName] = $primaryKey;
            }

            return $this;
        }


        /**
         * @inheritdoc
         */
        public function getPrimaryKey($table)
        {
            if (isset($this->tablePrimaryKey[$table])) {
                return $this->tablePrimaryKey[$table];
            }

            return $this->fallback->getPrimaryKey($table);
        }


        /**
         * @inheritdoc
         */
        public function getTable($entityClass)
        {
            if (isset($this->entityToTable[$entityClass])) {
                return $this->entityToTable[$entityClass];
            }

            return $this->fallback->getTable($entityClass);
        }


        /**
         * @inheritdoc
         */
        public function getEntityClass($table, Row $row = NULL)
        {
            if (isset($this->tableToEntity[$table])) {
                return $this->tableToEntity[$table];
            }

            return $this->fallback->getEntityClass($table, $row);
        }


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


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


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


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


        /**
         * @inheritdoc
         */
        public function getTableByRepositoryClass($repositoryClass)
        {
            if (isset($this->repositoryToTable[$repositoryClass])) {
                return $this->repositoryToTable[$repositoryClass];
            }

            return $this->fallback->getTableByRepositoryClass($repositoryClass);
        }


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