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<?php

namespace Greg\Orm\Dialect;

use Greg\Orm\Model;

class SqlDialect implements SqlDialectStrategy

{

/**

* @var string

*/

protected $quoteNameWith = '`';

/**

* @var string

*/

protected $nameRegex = '[a-z0-9_\.\*]+';

/**

* @var string

*/

protected $dateFormat = 'Y-m-d';

/**

* @var string

*/

protected $timeFormat = 'H:i:s';

/**

* @var string

*/

protected $dateTimeFormat = 'Y-m-d H:i:s';

/**

* @param string $name

*

* @return string

*/

public function quoteTable(string $name): string

{

if (preg_match('#^(' . $this->nameRegex . ')$#i', $name)) {

return static::quoteName($name);

}

return static::quote($name);

}

/**

* @param string $name

*

* @return string

*/

public function quoteName(string $name): string

{

$sql = explode('.', $name);

$sql = array_map(function ($part) {

return $part !== '*' ? $this->quoteNameWith . $part . $this->quoteNameWith : $part;

}, $sql);

$sql = implode('.', $sql);

return $sql;

}

/**

* @param string $sql

*

* @return string

*/

public function quote(string $sql): string

{

return preg_replace_callback('#".*\!' . $this->nameRegex . '.*"|\!(' . $this->nameRegex . ')#i', function ($matches) {

return isset($matches[1]) ? static::quoteName($matches[1]) : $matches[0];

}, $sql);

}

/**

* @param $name

*

* @return array

*/

public function parseTable($name): array

{

if ($name instanceof Model) {

return [$name->alias(), $name->name()];

}

if (is_array($name)) {

return [key($name), current($name)];

}

if (is_scalar($name)) {

return static::parseName($name);

}

return [null, $name];

}

/**

* @param string $name

*

* @return array

*/

public function parseName(string $name): array

{

preg_match('#^(.*?)(?:\s+(?:as\s+)?([a-z0-9_]+))?$#i', $name, $matches);

return [$matches[2] ?? null, $matches[1]];

}

/**

* @param array $values

* @param string $delimiter

*

* @return string

*/

public function concat(array $values, string $delimiter = ''): string

{

if ($delimiter) {

return implode(' + ' . $delimiter . ' + ', $values);

}

return implode(' + ', $values);

}

/**

* @param string $sql

* @param int $limit

*

* @return string

*/

public function limit(string $sql, int $limit): string

{

return ($sql ? $sql . ' ' : '') . 'LIMIT ' . $limit;

}

/**

* @param string $sql

* @param int $limit

*

* @return string

*/

public function offset(string $sql, int $limit): string

{

return ($sql ? $sql . ' ' : '') . 'OFFSET ' . $limit;

}

/**

* @param string $sql

*

* @return string

*/

public function lockForUpdate(string $sql): string

{

return $sql;

}

/**

* @param string $sql

*

* @return string

*/

public function lockForShare(string $sql): string

{

return $sql;

}

/**

* @param string $time

*

* @return string

*/

public function dateString(string $time): string

{

return date($this->dateFormat, ctype_digit($time) ? $time : strtotime($time));

}

/**

* @param string $time

*

* @return string

*/

public function timeString(string $time): string

{

return date($this->timeFormat, ctype_digit($time) ? $time : strtotime($time));

}

/**

* @param string $time

*

* @return string

*/

public function dateTimeString(string $time): string

{

return date($this->dateTimeFormat, ctype_digit($time) ? $time : strtotime($time));

}

/**

* @param string $column

* @param string|null $alias

*

* @return string

*/

public function count(string $column = '*', string $alias = null): string

{

if ($alias) {

$alias = $this->quoteName($alias);

}

return 'COUNT(' . $this->quoteName($column) . ')' . ($alias ? ' AS ' . $alias : '');

}

/**

* @param string $column

* @param string|null $alias

*

* @return string

*/

public function selectCount(string $column = '*', string $alias = null): string

{

return 'SELECT ' . $this->count($column, $alias);

}

/**

* @param string $column

* @param string|null $alias

*

* @return string

*/

public function max(string $column, string $alias = null): string

{

if ($alias) {

$alias = $this->quoteName($alias);

}

return 'MAX(' . $this->quoteName($column) . ')' . ($alias ? ' AS ' . $alias : '');

}

public function selectMax(string $column, string $alias = null): string

{

return 'SELECT ' . $this->max($column, $alias);

}

/**

* @param string $column

* @param string|null $alias

*

* @return string

*/

public function min(string $column, string $alias = null): string

{

if ($alias) {

$alias = $this->quoteName($alias);

}

return 'MIN(' . $this->quoteName($column) . ')' . ($alias ? ' AS ' . $alias : '');

}

public function selectMin(string $column, string $alias = null): string

{

return 'SELECT ' . $this->min($column, $alias);

}

/**

* @param string $column

* @param string|null $alias

*

* @return string

*/

public function avg(string $column, string $alias = null): string

{

if ($alias) {

$alias = $this->quoteName($alias);

}

return 'AVG(' . $this->quoteName($column) . ')' . ($alias ? ' AS ' . $alias : '');

}

public function selectAvg(string $column, string $alias = null): string

{

return 'SELECT ' . $this->avg($column, $alias);

}

/**

* @param string $column

* @param string|null $alias

*

* @return string

*/

public function sum(string $column, string $alias = null): string

{

if ($alias) {

$alias = $this->quoteName($alias);

}

return 'SUM(' . $this->quoteName($column) . ')' . ($alias ? ' AS ' . $alias : '');

}

public function selectSum(string $column, string $alias = null): string

{

return 'SELECT ' . $this->sum($column, $alias);

}

public function selectAll(string $from): string

{

return 'SELECT * FROM `' . $from . '`';

}

}