<?php
/*
 *  $Id$
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the LGPL. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\ORM\Persisters;

use Doctrine\ORM\ORMException;

/**
 * The joined subclass persister maps a single entity instance to several tables in the
 * database as it is defined by the <tt>Class Table Inheritance</tt> strategy.
 *
 * @author Roman Borschel <roman@code-factory.org>
 * @license http://www.opensource.org/licenses/lgpl-license.php LGPL
 * @link www.doctrine-project.org
 * @since 2.0
 * @see http://martinfowler.com/eaaCatalog/classTableInheritance.html
 */
class JoinedSubclassPersister extends AbstractEntityInheritancePersister
{
    /**
     * Map that maps column names to the table names that own them.
     * This is mainly a temporary cache, used during a single request.
     */
    private $_owningTableMap = array();

    /**
     * {@inheritdoc}
     */
    protected function _getDiscriminatorColumnTableName()
    {
        if ($this->_class->name == $this->_class->rootEntityName) {
            return $this->_class->table['name'];
        } else {
            return $this->_em->getClassMetadata($this->_class->rootEntityName)->table['name'];
        }
    }

    /**
     * This function finds the ClassMetadata instance in an inheritance hierarchy
     * that is responsible for enabling versioning.
     *
     * @return Doctrine\ORM\Mapping\ClassMetadata
     */
    private function _getVersionedClassMetadata()
    {
        if (isset($this->_class->fieldMappings[$this->_class->versionField]['inherited'])) {
            $definingClassName = $this->_class->fieldMappings[$this->_class->versionField]['inherited'];
            return $this->_em->getClassMetadata($definingClassName);
        }
        return $this->_class;
    }

    /**
     * Gets the name of the table that owns the column the given field is mapped to.
     *
     * @param string $fieldName
     * @return string
     * @override
     */
    public function getOwningTable($fieldName)
    {
        if ( ! isset($this->_owningTableMap[$fieldName])) {
            if (isset($this->_class->associationMappings[$fieldName])) {
                if (isset($this->_class->inheritedAssociationFields[$fieldName])) {
                    $this->_owningTableMap[$fieldName] = $this->_em->getClassMetadata(
                        $this->_class->inheritedAssociationFields[$fieldName]
                        )->table['name'];
                } else {
                    $this->_owningTableMap[$fieldName] = $this->_class->table['name'];
                }
            } else if (isset($this->_class->fieldMappings[$fieldName]['inherited'])) {
                $this->_owningTableMap[$fieldName] = $this->_em->getClassMetadata(
                    $this->_class->fieldMappings[$fieldName]['inherited']
                    )->table['name'];
            } else {
                $this->_owningTableMap[$fieldName] = $this->_class->table['name'];
            }
        }

        return $this->_owningTableMap[$fieldName];
    }

    /**
     * {@inheritdoc}
     */
    public function executeInserts()
    {
        if ( ! $this->_queuedInserts) {
            return;
        }

        if ($this->_class->isVersioned) {
            $versionedClass = $this->_getVersionedClassMetadata();
        }

        $postInsertIds = array();
        $idGen = $this->_class->idGenerator;
        $isPostInsertId = $idGen->isPostInsertGenerator();

        // Prepare statement for the root table
        $rootClass = $this->_class->name == $this->_class->rootEntityName ?
                $this->_class : $this->_em->getClassMetadata($this->_class->rootEntityName);
        $rootPersister = $this->_em->getUnitOfWork()->getEntityPersister($rootClass->name);
        $rootTableName = $rootClass->table['name'];
        $rootTableStmt = $this->_conn->prepare($rootPersister->getInsertSQL());

        // Prepare statements for sub tables.
        $subTableStmts = array();
        if ($rootClass !== $this->_class) {
            $subTableStmts[$this->_class->table['name']] = $this->_conn->prepare($this->getInsertSQL());
        }
        foreach ($this->_class->parentClasses as $parentClassName) {
            $parentClass = $this->_em->getClassMetadata($parentClassName);
            $parentTableName = $parentClass->table['name'];
            if ($parentClass !== $rootClass) {
                $parentPersister = $this->_em->getUnitOfWork()->getEntityPersister($parentClassName);
                $subTableStmts[$parentTableName] = $this->_conn->prepare($parentPersister->getInsertSQL());
            }
        }

        // Execute all inserts. For each entity:
        // 1) Insert on root table
        // 2) Insert on sub tables
        foreach ($this->_queuedInserts as $entity) {
            $insertData = $this->_prepareInsertData($entity);

            // Execute insert on root table
            $paramIndex = 1;
            foreach ($insertData[$rootTableName] as $columnName => $value) {
                $rootTableStmt->bindValue($paramIndex++, $value, $this->_columnTypes[$columnName]);
            }
            $rootTableStmt->execute();

            if ($isPostInsertId) {
                $id = $idGen->generate($this->_em, $entity);
                $postInsertIds[$id] = $entity;
            } else {
                $id = $this->_em->getUnitOfWork()->getEntityIdentifier($entity);
            }

            // Execute inserts on subtables.
            // The order doesn't matter because all child tables link to the root table via FK.
            foreach ($subTableStmts as $tableName => $stmt) {
                $data = isset($insertData[$tableName]) ? $insertData[$tableName] : array();
                $paramIndex = 1;
                foreach ((array) $id as $idVal) {
                    $stmt->bindValue($paramIndex++, $idVal);
                }
                foreach ($data as $columnName => $value) {
                    $stmt->bindValue($paramIndex++, $value, $this->_columnTypes[$columnName]);
                }
                $stmt->execute();
            }
        }

        $rootTableStmt->closeCursor();
        foreach ($subTableStmts as $stmt) {
            $stmt->closeCursor();
        }

        if (isset($versionedClass)) {
            $this->_assignDefaultVersionValue($versionedClass, $entity, $id);
        }

        $this->_queuedInserts = array();

        return $postInsertIds;
    }

    /**
     * {@inheritdoc}
     */
    public function update($entity)
    {
        $updateData = $this->_prepareUpdateData($entity);

        if ($isVersioned = $this->_class->isVersioned) {
            $versionedTable = $this->_getVersionedClassMetadata()->table['name'];
        }

        if ($updateData) {
            foreach ($updateData as $tableName => $data) {
                $this->_updateTable($entity, $tableName, $data, $isVersioned && $versionedTable == $tableName);
            }
            // Make sure the table with the version column is updated even if no columns on that
            // table were affected.
            if ($isVersioned && ! isset($updateData[$versionedTable])) {
                $this->_updateTable($entity, $versionedTable, array(), true);
            }
        }
    }

    /**
     * {@inheritdoc}
     */
    public function delete($entity)
    {
        $id = array_combine(
            $this->_class->getIdentifierColumnNames(),
            $this->_em->getUnitOfWork()->getEntityIdentifier($entity)
        );

        // If the database platform supports FKs, just
        // delete the row from the root table. Cascades do the rest.
        if ($this->_platform->supportsForeignKeyConstraints()) {
            $this->_conn->delete($this->_em->getClassMetadata($this->_class->rootEntityName)
                    ->getQuotedTableName($this->_platform), $id);
        } else {
            // Delete from all tables individually, starting from this class' table up to the root table.
            $this->_conn->delete($this->_class->getQuotedTableName($this->_platform), $id);
            foreach ($this->_class->parentClasses as $parentClass) {
                $this->_conn->delete($this->_em->getClassMetadata($parentClass)->getQuotedTableName($this->_platform), $id);
            }
        }
    }

    /**
     * {@inheritdoc}
     */
    protected function _getSelectEntitiesSQL(array &$criteria, $assoc = null, $orderBy = null)
    {
        $idColumns = $this->_class->getIdentifierColumnNames();
        $baseTableAlias = $this->_getSQLTableAlias($this->_class);

        if ($this->_selectColumnListSql === null) {
            // Add regular columns
            $columnList = '';
            foreach ($this->_class->fieldMappings as $fieldName => $mapping) {
                if ($columnList != '') $columnList .= ', ';
                $columnList .= $this->_getSelectColumnSQL($fieldName,
                isset($mapping['inherited']) ? $this->_em->getClassMetadata($mapping['inherited']) : $this->_class);
            }

            // Add foreign key columns
            foreach ($this->_class->associationMappings as $assoc) {
                if ($assoc->isOwningSide && $assoc->isOneToOne()) {
                    $tableAlias = isset($this->_class->inheritedAssociationFields[$assoc->sourceFieldName]) ?
                    $this->_getSQLTableAlias($this->_em->getClassMetadata($this->_class->inheritedAssociationFields[$assoc->sourceFieldName]))
                    : $baseTableAlias;
                    foreach ($assoc->targetToSourceKeyColumns as $srcColumn) {
                        $columnAlias = $srcColumn . $this->_sqlAliasCounter++;
                        $columnList .= ", $tableAlias.$srcColumn AS $columnAlias";
                        $resultColumnName = $this->_platform->getSQLResultCasing($columnAlias);
                        if ( ! isset($this->_resultColumnNames[$resultColumnName])) {
                            $this->_resultColumnNames[$resultColumnName] = $srcColumn;
                        }
                    }
                }
            }

            // Add discriminator column (DO NOT ALIAS THIS COLUMN, see StandardEntityPersister#_processSQLResultInheritanceAware).
            $discrColumn = $this->_class->discriminatorColumn['name'];
            if ($this->_class->rootEntityName == $this->_class->name) {
                $columnList .= ", $baseTableAlias.$discrColumn";
            } else {
                $columnList .= ', ' . $this->_getSQLTableAlias($this->_em->getClassMetadata($this->_class->rootEntityName))
                        . ".$discrColumn";
            }

            $resultColumnName = $this->_platform->getSQLResultCasing($discrColumn);
            $this->_resultColumnNames[$resultColumnName] = $discrColumn;
        }

        // INNER JOIN parent tables
        $joinSql = '';
        foreach ($this->_class->parentClasses as $parentClassName) {
            $parentClass = $this->_em->getClassMetadata($parentClassName);
            $tableAlias = $this->_getSQLTableAlias($parentClass);
            $joinSql .= ' INNER JOIN ' . $parentClass->getQuotedTableName($this->_platform) . ' ' . $tableAlias . ' ON ';
            $first = true;
            foreach ($idColumns as $idColumn) {
                if ($first) $first = false; else $joinSql .= ' AND ';
                $joinSql .= $baseTableAlias . '.' . $idColumn . ' = ' . $tableAlias . '.' . $idColumn;
            }
        }

        // OUTER JOIN sub tables
        foreach ($this->_class->subClasses as $subClassName) {
            $subClass = $this->_em->getClassMetadata($subClassName);
            $tableAlias = $this->_getSQLTableAlias($subClass);

            if ($this->_selectColumnListSql === null) {
                // Add subclass columns
                foreach ($subClass->fieldMappings as $fieldName => $mapping) {
                    if (isset($mapping['inherited'])) {
                        continue;
                    }
                    $columnList .= ', ' . $this->_getSelectColumnSQL($fieldName, $subClass);
                }

                // Add join columns (foreign keys)
                foreach ($subClass->associationMappings as $assoc2) {
                    if ($assoc2->isOwningSide && $assoc2->isOneToOne() && ! isset($subClass->inheritedAssociationFields[$assoc2->sourceFieldName])) {
                        foreach ($assoc2->targetToSourceKeyColumns as $srcColumn) {
                            $columnAlias = $srcColumn . $this->_sqlAliasCounter++;
                            $columnList .= ', ' . $tableAlias . ".$srcColumn AS $columnAlias";
                            $resultColumnName = $this->_platform->getSQLResultCasing($columnAlias);
                            if ( ! isset($this->_resultColumnNames[$resultColumnName])) {
                                $this->_resultColumnNames[$resultColumnName] = $srcColumn;
                            }
                        }
                    }
                }
            }

            // Add LEFT JOIN
            $joinSql .= ' LEFT JOIN ' . $subClass->getQuotedTableName($this->_platform) . ' ' . $tableAlias . ' ON ';
            $first = true;
            foreach ($idColumns as $idColumn) {
                if ($first) $first = false; else $joinSql .= ' AND ';
                $joinSql .= $baseTableAlias . '.' . $idColumn . ' = ' . $tableAlias . '.' . $idColumn;
            }
        }

        $conditionSql = '';
        foreach ($criteria as $field => $value) {
            if ($conditionSql != '') $conditionSql .= ' AND ';
            if (isset($this->_class->fieldMappings[$field]['inherited'])) {
                $conditionSql .= $this->_getSQLTableAlias($this->_em->getClassMetadata($this->_class->fieldMappings[$field]['inherited'])) . '.';
            } else {
                $conditionSql .= $baseTableAlias . '.';
            }
            if (isset($this->_class->columnNames[$field])) {
                $conditionSql .= $this->_class->getQuotedColumnName($field, $this->_platform);
            } else if ($assoc !== null) {
                $conditionSql .= $field;
            } else {
                throw ORMException::unrecognizedField($field);
            }
            $conditionSql .= ' = ?';
        }

        $orderBySql = '';
        if ($orderBy !== null) {
            $orderBySql = $this->_getCollectionOrderBySQL($orderBy, $baseTableAlias);
        }

        if ($this->_selectColumnListSql === null) {
            $this->_selectColumnListSql = $columnList;
        }

        return 'SELECT ' . $this->_selectColumnListSql
                . ' FROM ' . $this->_class->getQuotedTableName($this->_platform) . ' ' . $baseTableAlias
                . $joinSql
                . ($conditionSql != '' ? ' WHERE ' . $conditionSql : '') . $orderBySql;
    }
    
    /** Ensure this method is never called. This persister overrides _getSelectEntitiesSQL directly. */
    protected function _getSelectColumnListSQL()
    {
        throw new \BadMethodCallException("Illegal invocation of ".__METHOD__." on JoinedSubclassPersister.");
    }
    
    /** {@inheritdoc} */
    protected function _getInsertColumnList()
    {
        // Identifier columns must always come first in the column list of subclasses.
        $columns = $this->_class->parentClasses ? $this->_class->getIdentifierColumnNames() : array();

        foreach ($this->_class->reflFields as $name => $field) {
            if (isset($this->_class->fieldMappings[$name]['inherited']) && ! isset($this->_class->fieldMappings[$name]['id'])
                    || isset($this->_class->inheritedAssociationFields[$name])
                    || ($this->_class->isVersioned && $this->_class->versionField == $name)) {
                continue;
            }

            if (isset($this->_class->associationMappings[$name])) {
                $assoc = $this->_class->associationMappings[$name];
                if ($assoc->isOneToOne() && $assoc->isOwningSide) {
                    foreach ($assoc->targetToSourceKeyColumns as $sourceCol) {
                        $columns[] = $sourceCol;
                    }
                }
            } else if ($this->_class->name != $this->_class->rootEntityName ||
                    ! $this->_class->isIdGeneratorIdentity() || $this->_class->identifier[0] != $name) {
                $columns[] = $this->_class->getQuotedColumnName($name, $this->_platform);
            }
        }

        // Add discriminator column if it is the topmost class.
        if ($this->_class->name == $this->_class->rootEntityName) {
            $columns[] = $this->_class->discriminatorColumn['name'];
        }

        return $columns;
    }

    /**
     * Gets the SQL to select a collection of entities in a many-many association.
     *
     * @param ManyToManyMapping $manyToMany
     * @param array $criteria
     * @return string
     */
    protected function _getSelectManyToManyEntityCollectionSQL($manyToMany, array &$criteria)
    {
        // @todo
        throw new \BadMethodCallException("Not yet implemented, see http://www.doctrine-project.org/jira/browse/DDC-342");
    }
}