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<?php
/*
* 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 MIT license. For more information, see
* <http://www.doctrine-project.org>.
*/

namespace Doctrine\DBAL\Platforms;

use Doctrine\DBAL\Schema\TableDiff,
    Doctrine\DBAL\Schema\Table;

/**
* PostgreSqlPlatform.
*
* @since 2.0
* @author Roman Borschel <roman@code-factory.org>
* @author Lukas Smith <smith@pooteeweet.org> (PEAR MDB2 library)
* @author Benjamin Eberlei <kontakt@beberlei.de>
* @todo Rename: PostgreSQLPlatform
*/
class PostgreSqlPlatform extends AbstractPlatform
{
    /**
* {@inheritDoc}
*/
    public function getSubstringExpression($value, $from, $length = null)
    {
        if ($length === null) {
            return 'SUBSTR(' . $value . ', ' . $from . ')';
        }

        return 'SUBSTR(' . $value . ', ' . $from . ', ' . $length . ')';
    }

    /**
* {@inheritDoc}
*/
    public function getNowExpression()
    {
        return 'LOCALTIMESTAMP(0)';
    }

    /**
* {@inheritDoc}
*/
    public function getRegexpExpression()
    {
        return 'SIMILAR TO';
    }

    /**
* {@inheritDoc}
*/
    public function getLocateExpression($str, $substr, $startPos = false)
    {
        if ($startPos !== false) {
            $str = $this->getSubstringExpression($str, $startPos);

            return 'CASE WHEN (POSITION('.$substr.' IN '.$str.') = 0) THEN 0 ELSE (POSITION('.$substr.' IN '.$str.') + '.($startPos-1).') END';
        }

        return 'POSITION('.$substr.' IN '.$str.')';
    }

    /**
* {@inheritDoc}
*/
    public function getDateDiffExpression($date1, $date2)
    {
        return '(DATE(' . $date1 . ')-DATE(' . $date2 . '))';
    }

    /**
* {@inheritDoc}
*/
    public function getDateAddDaysExpression($date, $days)
    {
        return "(" . $date ." + (" . $days . " || ' day')::interval)";
    }

    /**
* {@inheritDoc}
*/
    public function getDateSubDaysExpression($date, $days)
    {
        return "(" . $date ." - (" . $days . " || ' day')::interval)";
    }

    /**
* {@inheritDoc}
*/
    public function getDateAddMonthExpression($date, $months)
    {
        return "(" . $date ." + (" . $months . " || ' month')::interval)";
    }

    /**
* {@inheritDoc}
*/
    public function getDateSubMonthExpression($date, $months)
    {
        return "(" . $date ." - (" . $months . " || ' month')::interval)";
    }

    /**
* {@inheritDoc}
*/
    public function supportsSequences()
    {
        return true;
    }

    /**
* {@inheritDoc}
*/
    public function supportsSchemas()
    {
        return true;
    }

    /**
* {@inheritDoc}
*/
    public function supportsIdentityColumns()
    {
        return true;
    }

    /**
* {@inheritDoc}
*/
    public function supportsCommentOnStatement()
    {
        return true;
    }

    /**
* {@inheritDoc}
*/
    public function prefersSequences()
    {
        return true;
    }

    public function getListDatabasesSQL()
    {
        return 'SELECT datname FROM pg_database';
    }

    public function getListSequencesSQL($database)
    {
        return "SELECT
c.relname, n.nspname AS schemaname
FROM
pg_class c, pg_namespace n
WHERE relkind = 'S' AND n.oid = c.relnamespace AND
(n.nspname NOT LIKE 'pg_%' AND n.nspname != 'information_schema')";
    }

    public function getListTablesSQL()
    {
        return "SELECT tablename AS table_name, schemaname AS schema_name
FROM pg_tables WHERE schemaname NOT LIKE 'pg_%' AND schemaname != 'information_schema' AND tablename != 'geometry_columns' AND tablename != 'spatial_ref_sys'";
    }

    /**
* {@inheritDoc}
*/
    public function getListViewsSQL($database)
    {
        return 'SELECT viewname, definition FROM pg_views';
    }

    public function getListTableForeignKeysSQL($table, $database = null)
    {
        return "SELECT r.conname, pg_catalog.pg_get_constraintdef(r.oid, true) as condef
FROM pg_catalog.pg_constraint r
WHERE r.conrelid =
(
SELECT c.oid
FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n
WHERE " .$this->getTableWhereClause($table) ." AND n.oid = c.relnamespace
)
AND r.contype = 'f'";
    }

    public function getCreateViewSQL($name, $sql)
    {
        return 'CREATE VIEW ' . $name . ' AS ' . $sql;
    }

    public function getDropViewSQL($name)
    {
        return 'DROP VIEW '. $name;
    }

    public function getListTableConstraintsSQL($table)
    {
        return "SELECT
relname
FROM
pg_class
WHERE oid IN (
SELECT indexrelid
FROM pg_index, pg_class
WHERE pg_class.relname = '$table'
AND pg_class.oid = pg_index.indrelid
AND (indisunique = 't' OR indisprimary = 't')
)";
    }

    /**
* {@inheritDoc}
*
* @license New BSD License
* @link http://ezcomponents.org/docs/api/trunk/DatabaseSchema/ezcDbSchemaPgsqlReader.html
*/
    public function getListTableIndexesSQL($table, $currentDatabase = null)
    {
        return "SELECT relname, pg_index.indisunique, pg_index.indisprimary,
pg_index.indkey, pg_index.indrelid
FROM pg_class, pg_index
WHERE oid IN (
SELECT indexrelid
FROM pg_index si, pg_class sc, pg_namespace sn
WHERE " . $this->getTableWhereClause($table, 'sc', 'sn')." AND sc.oid=si.indrelid AND sc.relnamespace = sn.oid
) AND pg_index.indexrelid = oid";
    }

    /**
* @param string $table
* @param string $classAlias
* @param string $namespaceAlias
*
* @return string
*/
    private function getTableWhereClause($table, $classAlias = 'c', $namespaceAlias = 'n')
    {
        $whereClause = $namespaceAlias.".nspname NOT IN ('pg_catalog', 'information_schema', 'pg_toast') AND ";
        if (strpos($table, ".") !== false) {
            list($schema, $table) = explode(".", $table);
            $schema = "'" . $schema . "'";
        } else {
            $schema = "ANY(string_to_array((select setting from pg_catalog.pg_settings where name = 'search_path'),','))";
        }
        $whereClause .= "$classAlias.relname = '" . $table . "' AND $namespaceAlias.nspname = $schema";

        return $whereClause;
    }

    public function getListTableColumnsSQL($table, $database = null)
    {
        return "SELECT
a.attnum,
a.attname AS field,
t.typname AS type,
format_type(a.atttypid, a.atttypmod) AS complete_type,
(SELECT t1.typname FROM pg_catalog.pg_type t1 WHERE t1.oid = t.typbasetype) AS domain_type,
(SELECT format_type(t2.typbasetype, t2.typtypmod) FROM pg_catalog.pg_type t2
WHERE t2.typtype = 'd' AND t2.typname = format_type(a.atttypid, a.atttypmod)) AS domain_complete_type,
a.attnotnull AS isnotnull,
(SELECT 't'
FROM pg_index
WHERE c.oid = pg_index.indrelid
AND pg_index.indkey[0] = a.attnum
AND pg_index.indisprimary = 't'
) AS pri,
(SELECT pg_attrdef.adsrc
FROM pg_attrdef
WHERE c.oid = pg_attrdef.adrelid
AND pg_attrdef.adnum=a.attnum
) AS default,
(SELECT pg_description.description
FROM pg_description WHERE pg_description.objoid = c.oid AND a.attnum = pg_description.objsubid
) AS comment
FROM pg_attribute a, pg_class c, pg_type t, pg_namespace n
WHERE ".$this->getTableWhereClause($table, 'c', 'n') ."
AND a.attnum > 0
AND a.attrelid = c.oid
AND a.atttypid = t.oid
AND n.oid = c.relnamespace
ORDER BY a.attnum";
    }

    /**
* {@inheritDoc}
*/
    public function getCreateDatabaseSQL($name)
    {
        return 'CREATE DATABASE ' . $name;
    }

    /**
* {@inheritDoc}
*/
    public function getAdvancedForeignKeyOptionsSQL(\Doctrine\DBAL\Schema\ForeignKeyConstraint $foreignKey)
    {
        $query = '';

        if ($foreignKey->hasOption('match')) {
            $query .= ' MATCH ' . $foreignKey->getOption('match');
        }

        $query .= parent::getAdvancedForeignKeyOptionsSQL($foreignKey);

        if ($foreignKey->hasOption('deferrable') && $foreignKey->getOption('deferrable') !== false) {
            $query .= ' DEFERRABLE';
        } else {
            $query .= ' NOT DEFERRABLE';
        }

        if ($foreignKey->hasOption('feferred') && $foreignKey->getOption('feferred') !== false) {
            $query .= ' INITIALLY DEFERRED';
        } else {
            $query .= ' INITIALLY IMMEDIATE';
        }

        return $query;
    }

    /**
* {@inheritDoc}
*/
    public function getAlterTableSQL(TableDiff $diff)
    {
        $sql = array();
        $commentsSQL = array();
        $columnSql = array();

        foreach ($diff->addedColumns as $column) {
            if ($this->onSchemaAlterTableAddColumn($column, $diff, $columnSql)) {
                continue;
            }

            $query = 'ADD ' . $this->getColumnDeclarationSQL($column->getQuotedName($this), $column->toArray());
            $sql[] = 'ALTER TABLE ' . $diff->name . ' ' . $query;
            if ($comment = $this->getColumnComment($column)) {
                $commentsSQL[] = $this->getCommentOnColumnSQL($diff->name, $column->getName(), $comment);
            }
        }

        foreach ($diff->removedColumns as $column) {
            if ($this->onSchemaAlterTableRemoveColumn($column, $diff, $columnSql)) {
                continue;
            }

            $query = 'DROP ' . $column->getQuotedName($this);
            $sql[] = 'ALTER TABLE ' . $diff->name . ' ' . $query;
        }

        foreach ($diff->changedColumns as $columnDiff) {
            /** @var $columnDiff \Doctrine\DBAL\Schema\ColumnDiff */
            if ($this->onSchemaAlterTableChangeColumn($columnDiff, $diff, $columnSql)) {
                continue;
            }

            $oldColumnName = $columnDiff->oldColumnName;
            $column = $columnDiff->column;

            if ($columnDiff->hasChanged('type')) {
                $type = $column->getType();

                // here was a server version check before, but DBAL API does not support this anymore.
                $query = 'ALTER ' . $oldColumnName . ' TYPE ' . $type->getSqlDeclaration($column->toArray(), $this);
                $sql[] = 'ALTER TABLE ' . $diff->name . ' ' . $query;
            }

            if ($columnDiff->hasChanged('default')) {
                $query = 'ALTER ' . $oldColumnName . ' SET ' . $this->getDefaultValueDeclarationSQL($column->toArray());
                $sql[] = 'ALTER TABLE ' . $diff->name . ' ' . $query;
            }

            if ($columnDiff->hasChanged('notnull')) {
                $query = 'ALTER ' . $oldColumnName . ' ' . ($column->getNotNull() ? 'SET' : 'DROP') . ' NOT NULL';
                $sql[] = 'ALTER TABLE ' . $diff->name . ' ' . $query;
            }

            if ($columnDiff->hasChanged('autoincrement')) {
                if ($column->getAutoincrement()) {
                    // add autoincrement
                    $seqName = $diff->name . '_' . $oldColumnName . '_seq';

                    $sql[] = "CREATE SEQUENCE " . $seqName;
                    $sql[] = "SELECT setval('" . $seqName . "', (SELECT MAX(" . $oldColumnName . ") FROM " . $diff->name . "))";
                    $query = "ALTER " . $oldColumnName . " SET DEFAULT nextval('" . $seqName . "')";
                    $sql[] = "ALTER TABLE " . $diff->name . " " . $query;
                } else {
                    // Drop autoincrement, but do NOT drop the sequence. It might be re-used by other tables or have
                    $query = "ALTER " . $oldColumnName . " " . "DROP DEFAULT";
                    $sql[] = "ALTER TABLE " . $diff->name . " " . $query;
                }
            }

            if ($columnDiff->hasChanged('comment') && $comment = $this->getColumnComment($column)) {
                $commentsSQL[] = $this->getCommentOnColumnSQL($diff->name, $column->getName(), $comment);
            }

            if ($columnDiff->hasChanged('length')) {
                $query = 'ALTER ' . $column->getName() . ' TYPE ' . $column->getType()->getSqlDeclaration($column->toArray(), $this);
                $sql[] = 'ALTER TABLE ' . $diff->name . ' ' . $query;
            }
        }

        foreach ($diff->renamedColumns as $oldColumnName => $column) {
            if ($this->onSchemaAlterTableRenameColumn($oldColumnName, $column, $diff, $columnSql)) {
                continue;
            }

            $sql[] = 'ALTER TABLE ' . $diff->name . ' RENAME COLUMN ' . $oldColumnName . ' TO ' . $column->getQuotedName($this);
        }

        $tableSql = array();

        if ( ! $this->onSchemaAlterTable($diff, $tableSql)) {
            if ($diff->newName !== false) {
                $sql[] = 'ALTER TABLE ' . $diff->name . ' RENAME TO ' . $diff->newName;
            }

            $sql = array_merge($sql, $this->_getAlterTableIndexForeignKeySQL($diff), $commentsSQL);
        }

        return array_merge($sql, $tableSql, $columnSql);
    }

    /**
* {@inheritDoc}
*/
    public function getCreateSequenceSQL(\Doctrine\DBAL\Schema\Sequence $sequence)
    {
        return 'CREATE SEQUENCE ' . $sequence->getQuotedName($this) .
               ' INCREMENT BY ' . $sequence->getAllocationSize() .
               ' MINVALUE ' . $sequence->getInitialValue() .
               ' START ' . $sequence->getInitialValue();
    }

    /**
* {@inheritDoc}
*/
    public function getAlterSequenceSQL(\Doctrine\DBAL\Schema\Sequence $sequence)
    {
        return 'ALTER SEQUENCE ' . $sequence->getQuotedName($this) .
               ' INCREMENT BY ' . $sequence->getAllocationSize();
    }

    /**
* {@inheritDoc}
*/
    public function getDropSequenceSQL($sequence)
    {
        if ($sequence instanceof \Doctrine\DBAL\Schema\Sequence) {
            $sequence = $sequence->getQuotedName($this);
        }
        return 'DROP SEQUENCE ' . $sequence;
    }

    /**
* {@inheritDoc}
*/
    public function getDropForeignKeySQL($foreignKey, $table)
    {
        return $this->getDropConstraintSQL($foreignKey, $table);
    }

    /**
* {@inheritDoc}
*/
    protected function _getCreateTableSQL($tableName, array $columns, array $options = array())
    {
        $queryFields = $this->getColumnDeclarationListSQL($columns);

        if (isset($options['primary']) && ! empty($options['primary'])) {
            $keyColumns = array_unique(array_values($options['primary']));
            $queryFields .= ', PRIMARY KEY(' . implode(', ', $keyColumns) . ')';
        }

        $query = 'CREATE TABLE ' . $tableName . ' (' . $queryFields . ')';

        $sql[] = $query;

        if (isset($options['indexes']) && ! empty($options['indexes'])) {
            foreach ($options['indexes'] as $index) {
                $sql[] = $this->getCreateIndexSQL($index, $tableName);
            }
        }

        if (isset($options['foreignKeys'])) {
            foreach ((array) $options['foreignKeys'] as $definition) {
                $sql[] = $this->getCreateForeignKeySQL($definition, $tableName);
            }
        }

        return $sql;
    }

    /**
* {@inheritDoc}
*
* Postgres wants boolean values converted to the strings 'true'/'false'.
*/
    public function convertBooleans($item)
    {
        if (is_array($item)) {
            foreach ($item as $key => $value) {
                if (is_bool($value) || is_numeric($item)) {
                    $item[$key] = ($value) ? 'true' : 'false';
                }
            }
        } else {
           if (is_bool($item) || is_numeric($item)) {
               $item = ($item) ? 'true' : 'false';
           }
        }

        return $item;
    }

    public function getSequenceNextValSQL($sequenceName)
    {
        return "SELECT NEXTVAL('" . $sequenceName . "')";
    }

    /**
* {@inheritDoc}
*/
    public function getSetTransactionIsolationSQL($level)
    {
        return 'SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL '
                . $this->_getTransactionIsolationLevelSQL($level);
    }

    /**
* {@inheritDoc}
*/
    public function getBooleanTypeDeclarationSQL(array $field)
    {
        return 'BOOLEAN';
    }

    /**
* {@inheritDoc}
*/
    public function getIntegerTypeDeclarationSQL(array $field)
    {
        if ( ! empty($field['autoincrement'])) {
            return 'SERIAL';
        }

        return 'INT';
    }

    /**
* {@inheritDoc}
*/
    public function getBigIntTypeDeclarationSQL(array $field)
    {
        if ( ! empty($field['autoincrement'])) {
            return 'BIGSERIAL';
        }
        return 'BIGINT';
    }

    /**
* {@inheritDoc}
*/
    public function getSmallIntTypeDeclarationSQL(array $field)
    {
        return 'SMALLINT';
    }

    /**
* {@inheritDoc}
*/
    public function getGuidTypeDeclarationSQL(array $field)
    {
        return 'UUID';
    }

    /**
* {@inheritDoc}
*/
    public function getDateTimeTypeDeclarationSQL(array $fieldDeclaration)
    {
        return 'TIMESTAMP(0) WITHOUT TIME ZONE';
    }

    /**
* {@inheritDoc}
*/
    public function getDateTimeTzTypeDeclarationSQL(array $fieldDeclaration)
    {
        return 'TIMESTAMP(0) WITH TIME ZONE';
    }

    /**
* {@inheritDoc}
*/
    public function getDateTypeDeclarationSQL(array $fieldDeclaration)
    {
        return 'DATE';
    }

    /**
* {@inheritDoc}
*/
    public function getTimeTypeDeclarationSQL(array $fieldDeclaration)
    {
        return 'TIME(0) WITHOUT TIME ZONE';
    }

    /**
* {@inheritDoc}
*/
    protected function _getCommonIntegerTypeDeclarationSQL(array $columnDef)
    {
        return '';
    }

    /**
* {@inheritDoc}
*/
    protected function getVarcharTypeDeclarationSQLSnippet($length, $fixed)
    {
        return $fixed ? ($length ? 'CHAR(' . $length . ')' : 'CHAR(255)')
                : ($length ? 'VARCHAR(' . $length . ')' : 'VARCHAR(255)');
    }

    /**
* {@inheritDoc}
*/
    public function getClobTypeDeclarationSQL(array $field)
    {
        return 'TEXT';
    }

    /**
* {@inheritDoc}
*/
    public function getName()
    {
        return 'postgresql';
    }

    /**
* {@inheritDoc}
*
* PostgreSQL returns all column names in SQL result sets in lowercase.
*/
    public function getSQLResultCasing($column)
    {
        return strtolower($column);
    }

    /**
* {@inheritDoc}
*/
    public function getDateTimeTzFormatString()
    {
        return 'Y-m-d H:i:sO';
    }

    /**
* {@inheritDoc}
*/
    public function getEmptyIdentityInsertSQL($quotedTableName, $quotedIdentifierColumnName)
    {
        return 'INSERT INTO ' . $quotedTableName . ' (' . $quotedIdentifierColumnName . ') VALUES (DEFAULT)';
    }

    /**
* {@inheritDoc}
*/
    public function getTruncateTableSQL($tableName, $cascade = false)
    {
        return 'TRUNCATE '.$tableName.' '.(($cascade)?'CASCADE':'');
    }

    /**
* {@inheritDoc}
*/
    public function getReadLockSQL()
    {
        return 'FOR SHARE';
    }

    /**
* {@inheritDoc}
*/
    protected function initializeDoctrineTypeMappings()
    {
        $this->doctrineTypeMapping = array(
            'smallint' => 'smallint',
            'int2' => 'smallint',
            'serial' => 'integer',
            'serial4' => 'integer',
            'int' => 'integer',
            'int4' => 'integer',
            'integer' => 'integer',
            'bigserial' => 'bigint',
            'serial8' => 'bigint',
            'bigint' => 'bigint',
            'int8' => 'bigint',
            'bool' => 'boolean',
            'boolean' => 'boolean',
            'text' => 'text',
            'varchar' => 'string',
            'interval' => 'string',
            '_varchar' => 'string',
            'char' => 'string',
            'bpchar' => 'string',
            'date' => 'date',
            'datetime' => 'datetime',
            'timestamp' => 'datetime',
            'timestamptz' => 'datetimetz',
            'time' => 'time',
            'timetz' => 'time',
            'float' => 'float',
            'float4' => 'float',
            'float8' => 'float',
            'double' => 'float',
            'double precision' => 'float',
            'real' => 'float',
            'decimal' => 'decimal',
            'money' => 'decimal',
            'numeric' => 'decimal',
            'year' => 'date',
            'uuid' => 'guid',
            'bytea' => 'blob',
        );
    }

    /**
* {@inheritDoc}
*/
    public function getVarcharMaxLength()
    {
        return 65535;
    }

    /**
* {@inheritDoc}
*/
    protected function getReservedKeywordsClass()
    {
        return 'Doctrine\DBAL\Platforms\Keywords\PostgreSQLKeywords';
    }

    /**
* {@inheritDoc}
*/
    public function getBlobTypeDeclarationSQL(array $field)
    {
        return 'BYTEA';
    }
}
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