<?php

class Qs_Db_Table extends Zend_Db_Table
{
    protected $_alias;

    public function __construct($config)
    {
        if (is_string($config)) {
            $config = array('name' => Qs_Db::getTableName($config));
        }
        if ($config instanceof Zend_Config) {
            $config = $config->toArray();
        }
        if (!isset($config['name'])) {
            if (null === $this->_alias) {
                throw new Zend_Db_Table_Exception('property _alias is not defined');
            }
            $config['name'] = Qs_Db::getTableName($this->_alias);
        }
        if (!isset($config['db'])) {
            $config['db'] = Qs_Db::getInstance();
        }
        parent::__construct($config);
    }

    public function getPrimary()
    {
        if (null === $this->_primary) {
            $this->_setupPrimaryKey();
        }
        return (array) $this->_primary;
    }

    public function getMetaData()
    {
        $this->_setupMetadata();
        return (array) $this->_metadata;
    }

    public function getName()
    {
        return $this->_name;
    }

    public function insert(array $data)
    {
        $date = date('Y-m-d H:i:s');
        if (!isset($data['added'])) {
            $data['added'] = $date;
        }
        if (!isset($data['changed'])) {
            $data['changed'] = $date;
        }
        $this->unsetUnknownFields($data);
        return parent::insert($data);
    }

    public function update(array $data, $where)
    {
        if (!isset($data['changed'])) {
            $data['changed'] = date('Y-m-d H:i:s');
        }
        $this->unsetUnknownFields($data);
        return parent::update($data, $where);
    }

    public function updateDataByKey(array $data, $key)
    {
        $this->unsetUnknownFields($data);
        if (empty($data)) {
            return false;
        }
        $where = $this->prepareWhere($key);
        return parent::update($data, $where);
    }

    public function updateByKey(array $data, $key)
    {
        if (!isset($data['changed'])) {
            $data['changed'] = date('Y-m-d H:i:s');
        }
        return $this->updateDataByKey($data, $key);
    }

    public function save($data, $key)
    {
        if (($row = $this->findRow($key))) {
            $row->setFromArray($data);
            return $row->save();
        } else {
            $row = $this->createRow($data);
            return $row->save();
        }
    }

    /**
     * Search row by primary key
     * @param $key
     * @param bool $field
     * @param null $default
     * @return null
     */
    public function search($key, $field = null, $default = null)
    {
        if (false === ($row = $this->findRow($key))) {
            return $default;
        }
        return Qs_Array::get($row->toArray(), $field, $default);
    }

    /**
     * Search row using custom filter
     * @param array $filter
     * @param bool $field
     * @param null $default
     * @return array|null
     */
    public function searchBy(array $filter, $field = null, $default = null)
    {
        $select = $this->select(Qs_Db_Table::SELECT_WITH_FROM_PART);
        Qs_Db::filter($select, $filter, $this->_name);
        $select->limit(1);
        $result = $this->_db->fetchRow($select);
        return false === $result ? $result : Qs_Array::get($result, $field, $default);
    }

    /**
     * Search row by primary key
     * @param $key
     * @return bool | Zend_Db_Table_Row
     */

    public function findRow($key)
    {
        /** @var $rowset Zend_Db_Table_Rowset */
        $rowset = call_user_func_array(array($this, 'find'), (array)$key);
        if (count($rowset)) {
            return $rowset->current();
        }
        return false;
    }

    /**
     * Returns associative array
     * @param array|string $columns [OPTIONAL]
     * @param null|array $where [OPTIONAL] Array of conditions compatible with Qs_Db::getWhereSql()
     * @param null|string $order [OPTIONAL] Sorter filed
     * @param null|int $limit [OPTIONAL]
     * @return array
     * @throws Qs_Db_Exception
     */
    public function get4Select($columns = '*', $where = null, $order = null, $limit = null)
    {
        $select = $this->_db->select();
        $meta = $this->info(Zend_Db_Table::METADATA);

        if ('*' == $columns) {
            $columns = array_keys($meta);
            if (in_array('sorter', $columns)) {
                $columns = Qs_Array::excludeValue($columns, 'sorter');
            }
            $columnsCount = count($columns);
            if ($columnsCount) {
                if (count($columns) < 2) {
                    $column = array_pop($columns);
                    $columns['key'] = $column;
                    $columns['value'] = $column;
                } else if (count($columns) > 2) {
                    $columns = array_slice($columns, 0, 2);
                }
            } else {
                throw new Qs_Db_Exception('Wrong columns count');
            }
        }
        $select->from($this->_name, $columns);

        if (null !== $where) {
            $select->where(Qs_Db::getWhereSql($where));
        }

        if (null === $order) { // automatic order initialization
            if (array_key_exists('sorter', $meta)) {
                $order = 'sorter';
            } else if ('*' == $columns) {
                $primary = $this->info(Zend_Db_Table::PRIMARY);
                $fields = Qs_Array::excludeArray($meta, $primary);
                if ($fields) {
                    $order = key($fields);
                } else {
                    $order = $primary;
                }
            } else if (is_array($columns)) {
                $order = next($columns);
            }
        }

        if ($order) { // use $order = false to disable automatic initialization
            $select->order($order);
        }

        if (null !== $limit) {
            $select->limit($limit);
        }

        return (is_array($columns) && count($columns) > 2)
            ? $this->_db->fetchAssoc($select)
            : $this->_db->fetchPairs($select);
    }

    public function deleteByKey($key)
    {
        $where = $this->prepareWhere($key);
        return parent::delete($where);
    }

    public function deleteBy(array $filter)
    {
        $select = $this->select(Qs_Db_Table::SELECT_WITH_FROM_PART);
        Qs_Db::filter($select, $filter, $this->_name);
        $where = $select->getPart(Zend_Db_Select::WHERE);
        $where = implode(' ', $where);
        $where = trim($where);
        if (!$where) {
            throw new Qs_Exception('Delete By: wrong filter');
        }
        return parent::delete($where);
    }

    public function unsetUnknownFields(&$data)
    {
        $metaData = $this->getMetaData();
        $data = array_intersect_key($data, $metaData);
    }

    public function prepareWhere($args, $alias = null)
    {
        if (!is_array($args)) {
            $args = (array)$args;
        }
        $args = array_values($args);
        $this->_setupPrimaryKey();
        $keyNames = array_values((array) $this->_primary);

        if (count($args) < count($keyNames)) {
            // require_once 'Zend/Db/Table/Exception.php';
            throw new Zend_Db_Table_Exception("Too few columns for the primary key");
        }

        if (count($args) > count($keyNames)) {
            // require_once 'Zend/Db/Table/Exception.php';
            throw new Zend_Db_Table_Exception("Too many columns for the primary key");
        }

        $whereList = array();
        $numberTerms = 0;
        foreach ($args as $keyPosition => $keyValues) {
            // Coerce the values to an array.
            // Don't simply typecast to array, because the values
            // might be Zend_Db_Expr objects.
            if (!is_array($keyValues)) {
                $keyValues = array($keyValues);
            }
            if ($numberTerms == 0) {
                $numberTerms = count($keyValues);
            } else if (count($keyValues) != $numberTerms) {
                // require_once 'Zend/Db/Table/Exception.php';
                throw new Zend_Db_Table_Exception("Missing value(s) for the primary key");
            }
            for ($i = 0; $i < count($keyValues); ++$i) {
                if (!isset($whereList[$i])) {
                    $whereList[$i] = array();
                }
                $whereList[$i][$keyPosition] = $keyValues[$i];
            }
        }
        $whereClause = null;
        if (count($whereList)) {
            $whereOrTerms = array();
            foreach ($whereList as $keyValueSets) {
                $whereAndTerms = array();
                foreach ($keyValueSets as $keyPosition => $keyValue) {
                    $type = $this->_metadata[$keyNames[$keyPosition]]['DATA_TYPE'];
                    $tableName = $this->_db->quoteTableAs((null === $alias) ? $this->_name : $alias, null, true);
                    $columnName = $this->_db->quoteIdentifier($keyNames[$keyPosition], true);
                    $whereAndTerms[] = $this->_db->quoteInto(
                        $tableName . '.' . $columnName . ' = ?',
                        $keyValue, $type);
                }
                $whereOrTerms[] = '(' . implode(' AND ', $whereAndTerms) . ')';
            }
            $whereClause = '(' . implode(' OR ', $whereOrTerms) . ')';
        }
        while (substr($whereClause, 0, 1) == '(' && substr($whereClause, -1) == ')') {
            $whereClause = substr($whereClause, 1, -1);
        }
        return $whereClause;
    }
}