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<?php

/*
 +--------------------------------------------------------------------------+
 | This file is part of the Kolab Web Admin Panel                           |
 |                                                                          |
 | Copyright (C) 2011-2014, Kolab Systems AG                                |
 |                                                                          |
 | This program is free software: you can redistribute it and/or modify     |
 | it under the terms of the GNU Affero General Public License as published |
 | by the Free Software Foundation, either version 3 of the License, or     |
 | (at your option) any later version.                                      |
 |                                                                          |
 | This program is distributed in the hope that it will be useful,          |
 | but WITHOUT ANY WARRANTY; without even the implied warranty of           |
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the             |
 | GNU Affero General Public License for more details.                      |
 |                                                                          |
 | You should have received a copy of the GNU Affero General Public License |
 | along with this program. If not, see <http://www.gnu.org/licenses/>      |
 +--------------------------------------------------------------------------+
 | Author: Aleksander Machniak <machniak@kolabsys.com>                      |
 +--------------------------------------------------------------------------+
*/

/**
 * Database independent query interface
 */
class SQL_oracle extends SQL
{
    public $db_provider = 'oracle';

    /**
     * Connects to database
     */
    protected function connect()
    {
        if (!$this->conn && !$this->conn_tried) {
            Log::debug("SQL: Connecting to " . $this->sql_uri);

            $this->conn_tried = true;

            $dsn = self::parse_dsn($this->sql_uri);

            // Get database specific connection options
            $dsn_options = $this->dsn_options($dsn);

            $function = $this->db_pconn ? 'oci_pconnect' : 'oci_connect';

            if (!function_exists($function)) {
                $this->db_error     = true;
                $this->db_error_msg = 'OCI8 extension not loaded. See http://php.net/manual/en/book.oci8.php';

                Log::error($this->db_error_msg);
                return;
            }

            // connect
            $dbh = @$function($dsn['username'], $dsn['password'], $dsn_options['database'], $dsn_options['charset']);

            if (!$dbh) {
                $error              = oci_error();
                $this->db_error     = true;
                $this->db_error_msg = $error['message'];

                Log::error($this->db_error_msg);
                return;
            }

            // configure session
            $this->conn_configure($dsn, $dbh);

            $this->conn = $dbh;
        }

        return $this->conn;
    }

    /**
     * Driver-specific configuration of database connection
     *
     * @param array $dsn DSN for DB connections
     * @param PDO   $dbh Connection handler
     */
    protected function conn_configure($dsn, $dbh)
    {
        $init_queries = array(
            "ALTER SESSION SET nls_date_format = 'YYYY-MM-DD'",
            "ALTER SESSION SET nls_timestamp_format = 'YYYY-MM-DD HH24:MI:SS'",
        );

        foreach ($init_queries as $query) {
            $stmt = oci_parse($dbh, $query);
            oci_execute($stmt);
        }
    }

    /**
     * Execute a SQL query with limits
     *
     * @param string $query   SQL query to execute
     * @param array  $params  Values to be inserted in query
     * @param int    $offset  Offset for LIMIT statement
     * @param int    $numrows Number of rows for LIMIT statement
     *
     * @return resource|bool Query handle or False on error
     */
    public function query($query, $params = array(), $offset = null, $numrows = null)
    {
        if (!$this->connect()) {
            return $this->last_result = false;
        }

        $query = ltrim($query);

        if ($numrows || $offset) {
            $query = $this->set_limit($query, $numrows, $offset);
        }

        // replace self::DEFAULT_QUOTE with driver-specific quoting
        $query = $this->query_parse($query);

        // Because in Roundcube we mostly use queries that are
        // executed only once, we will not use prepared queries
        $pos  = 0;
        $idx  = 0;
        $args = array();

        if (count($params)) {
            while ($pos = strpos($query, '?', $pos)) {
                if ($query[$pos+1] == '?') {  // skip escaped '?'
                    $pos += 2;
                }
                else {
                    $val = $this->quote($params[$idx++]);

                    // long strings are not allowed inline, need to be parametrized
                    if (strlen($val) > 4000) {
                        $key = ':param' . (count($args) + 1);
                        $args[$key] = $params[$idx-1];
                        $val = $key;
                    }

                    unset($params[$idx-1]);
                    $query = substr_replace($query, $val, $pos, 1);
                    $pos += strlen($val);
                }
            }
        }

        // replace escaped '?' back to normal, see self::quote()
        $query = str_replace('??', '?', $query);
        $query = rtrim($query, " \t\n\r\0\x0B;");

        // log query
        Log::debug('SQL: ' . $query);

        // destroy reference to previous result
        $this->last_result  = null;
        $this->db_error_msg = null;

        // prepare query
        $result = @oci_parse($this->conn, $query);
        $mode   = $this->in_transaction ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;

        if ($result) {
            foreach ($args as $param => $arg) {
                oci_bind_by_name($result, $param, $args[$param], -1, SQLT_LNG);
            }
        }

        // execute query
        if (!$result || !@oci_execute($result, $mode)) {
            $result = $this->handle_error($query, $result);
        }

        return $this->last_result = $result;
    }

    /**
     * Helper method to handle DB errors.
     * This by default logs the error but could be overriden by a driver implementation
     *
     * @param string Query that triggered the error
     * @return mixed Result to be stored and returned
     */
    protected function handle_error($query, $result = null)
    {
        $error = oci_error(is_resource($result) ? $result : $this->conn);

        // @TODO: Find error codes for key errors
        if (empty($this->options['ignore_key_errors']) || !in_array($error['code'], array('23000', '23505'))) {
            $this->db_error = true;
            $this->db_error_msg = sprintf('[%s] %s', $error['code'], $error['message']);

            Log::error($this->db_error_msg . " (SQL Query: $query)");
        }

        return false;
    }

    /**
     * Get last inserted record ID
     *
     * @param string $table Table name (to find the incremented sequence)
     *
     * @return mixed ID or false on failure
     */
    public function insert_id($table = null)
    {
        $sequence = $this->quote_identifier($this->sequence_name($table));
        $result   = $this->query("SELECT $sequence.currval FROM dual");
        $result   = $this->fetch_array($result);

        return $result[0] ?: false;
    }

    /**
     * Get number of affected rows for the last query
     *
     * @param mixed $result Optional query handle
     *
     * @return int Number of (matching) rows
     */
    public function affected_rows($result = null)
    {
        if ($result || ($result === null && ($result = $this->last_result))) {
            return oci_num_rows($result);
        }

        return 0;
    }

    /**
     * Get an associative array for one row
     * If no query handle is specified, the last query will be taken as reference
     *
     * @param mixed $result Optional query handle
     *
     * @return mixed Array with col values or false on failure
     */
    public function fetch_assoc($result = null)
    {
        return $this->_fetch_row($result, OCI_ASSOC);
    }

    /**
     * Get an index array for one row
     * If no query handle is specified, the last query will be taken as reference
     *
     * @param mixed $result Optional query handle
     *
     * @return mixed Array with col values or false on failure
     */
    public function fetch_array($result = null)
    {
        return $this->_fetch_row($result, OCI_NUM);
    }

    /**
     * Get col values for a result row
     *
     * @param mixed $result Optional query handle
     * @param int   $mode   Fetch mode identifier
     *
     * @return mixed Array with col values or false on failure
     */
    protected function _fetch_row($result, $mode)
    {
        if ($result || ($result === null && ($result = $this->last_result))) {
            return oci_fetch_array($result, $mode + OCI_RETURN_NULLS + OCI_RETURN_LOBS);
        }

        return false;
    }

    /**
     * Formats input so it can be safely used in a query
     * PDO_OCI does not implement quote() method
     *
     * @param mixed  $input Value to quote
     * @param string $type  Type of data (integer, bool, ident)
     *
     * @return string Quoted/converted string for use in query
     */
    public function quote($input, $type = null)
    {
        // handle int directly for better performance
        if ($type == 'integer' || $type == 'int') {
            return intval($input);
        }

        if (is_null($input)) {
            return 'NULL';
        }

        if ($type == 'ident') {
            return $this->quote_identifier($input);
        }

        switch ($type) {
        case 'bool':
        case 'integer':
            return intval($input);
        default:
            return "'" . strtr($input, array(
                    '?' => '??',
                    "'" => "''",
                    SQL::DEFAULT_QUOTE => SQL::DEFAULT_QUOTE . SQL::DEFAULT_QUOTE
            )) . "'";
        }
    }

    /**
     * Return correct name for a specific database sequence
     *
     * @param string $table Table name
     *
     * @return string Translated sequence name
     */
    protected function sequence_name($table)
    {
        // Note: we support only one sequence per table
        // Note: The sequence name must be <table_name>_seq
        return $table . '_seq';
    }

    /**
     * Return SQL statement for case insensitive LIKE
     *
     * @param string $column Field name
     * @param string $value  Search value
     *
     * @return string SQL statement to use in query
     */
    public function ilike($column, $value)
    {
        return 'UPPER(' . $this->quote_identifier($column) . ') LIKE UPPER(' . $this->quote($value) . ')';
    }

    /**
     * Return SQL function for current time and date
     *
     * @param int $interval Optional interval (in seconds) to add/subtract
     *
     * @return string SQL function to use in query
     */
    public function now($interval = 0)
    {
        if ($interval) {
            $interval = intval($interval);
            return "current_timestamp + INTERVAL '$interval' SECOND";
        }

        return "current_timestamp";
    }

    /**
     * Adds TOP (LIMIT,OFFSET) clause to the query
     *
     * @param string $query  SQL query
     * @param int    $limit  Number of rows
     * @param int    $offset Offset
     *
     * @return string SQL query
     */
    protected function set_limit($query, $limit = 0, $offset = 0)
    {
        $limit  = intval($limit);
        $offset = intval($offset);
        $end    = $offset + $limit;

        // @TODO: Oracle 12g has better OFFSET support

        if (!$offset) {
            $query = "SELECT * FROM ($query) a WHERE rownum <= $end";
        }
        else {
            $query = "SELECT * FROM (SELECT a.*, rownum as rn FROM ($query) a WHERE rownum <= $end) b WHERE rn > $offset";
        }

        return $query;
    }

    /**
     * Returns connection options from DSN array
     */
    protected function dsn_options($dsn)
    {
        $params = array();

        if ($dsn['hostspec']) {
            $host = $dsn['hostspec'];
            if ($dsn['port']) {
                $host .= ':' . $dsn['port'];
            }

            $params['database'] = $host . '/' . $dsn['database'];
        }

        $params['charset'] = 'UTF8';

        return $params;
    }

    /**
     * Start transaction
     *
     * @return bool True on success, False on failure
     */
    public function startTransaction()
    {
        if (!$this->connect()) {
            return $this->last_result = false;
        }

        Log::debug('BEGIN TRANSACTION');

        return $this->last_result = $this->in_transaction = true;
    }

    /**
     * Commit transaction
     *
     * @return bool True on success, False on failure
     */
    public function endTransaction()
    {
        if (!$this->connect()) {
            return $this->last_result = false;
        }

        Log::debug('COMMIT TRANSACTION');

        if ($result = @oci_commit($this->conn)) {
            $this->in_transaction = true;
        }
        else {
            $this->handle_error('COMMIT');
        }

        return $this->last_result = $result;
    }

    /**
     * Rollback transaction
     *
     * @return bool True on success, False on failure
     */
    public function rollbackTransaction()
    {
        if (!$this->connect()) {
            return $this->last_result = false;
        }

        Log::debug('ROLLBACK TRANSACTION');

        if ($result = @oci_rollback($this->conn)) {
            $this->in_transaction = false;
        }
        else {
            $this->handle_error('ROLLBACK');
        }

        return $this->last_result = $this->conn->rollBack();
    }
}