/*
事務腳本模式: 類似于thinkphp中的model層，或者說就是操作數據庫的類。
個人覺得實踐中使用起來還是挺簡單方便的，就是SQL語句寫死了的話，靈活性就不夠。
示例代碼如下：

*/

namespace woo\process;

abstract class Base{
  static $DB;         //pdo對象
  static $stmts = array(); //sql語句句柄
  
  function __construct (){
    $dsn = \woo\base\ApplicationRegistry::getDSN();
    if(is_null($dsn)){
      throw new \woo\base\AppException("No DSN");
    }
    self::$DB = new PDO($dsn);
    self::$DB->setAttribute(\PDO::ATTR_ERRMODE,\PDO::ERRMODE_EXCEPTION);
  }
  
  function prepareStatement($stmt_s){  //緩存sql語句句柄
    if(isset(self::$stmts($stmt_s)){
      return self::$stmts[$stmt_s];
    }
    $stmt_handle = self::$DB->prepare($stmt_s);
    self::$stmts[$stmt_s] = $stmt_handle;
    return $stmt_handle;
  }
  
  protected function doStatement($stmt_s,$values_a){  //執行sql并獲取一個語句資源
    $sth = $this->prepareStatement($stmt_s);
    $sth->closeCursor();
    $db_result = $sth->execute($values_a);
    return $sth;
  }
}

//這個類就是向數據庫中寫入一些數據，比較簡單沒什么好多說的
class VenueManager extends Base{
  static $add_venue = "INSERT INTO venue (name) values(?)";
  static $add_space = "INSERT INTO space (name,venue) values(?,?)";
  static $check_slot = "SELECT id,name FROM event WHERE space = ? AND (start+duration)>? AND start <?";
  static $add_event = "INSERT INTO event (name,space,start,duration) values(?,?,?,?)";
  
  function addVenue($name,$space_array){
    $ret = array();
    $ret['venue'] = array($name);
    $this->doStatement(self::$add_venue,$ret['venue']);
    $v_id = self::$DB->lastInsertId();
    $ret['spaces'] = array();
    foreach($space_array as $space_name){
      $values = array($space_name,$v_id);
      $this->doStatement(self::$add_space,$values);
      $s_id = self::$DB->lastInsertId();
      array_unshift($values,$s_id);
      $ret['spaces'][] = $values;
    }
    return $ret;
  }
  
  function bookEvent ($space_id,$name,$time,$duration){
    $values = array($space_id,$time,($time+$duration));
    $stmt = $this->doStatement(self::$check_slot,$values,false);
    if($result = $stmt->fetch()){
      throw new \woo\base\AppException("double booked! try again");
    }
    $this->doStatement(self::$add_event,array($name,$space_id,$time,$duration));
  }
}

//客戶端,使用起來還是比較簡便的
$venue = new VenueManager();
$venue->addVenue('test',array('test1','test2','test3'));