<?php
class ext_dialtone {
	static function records($sort_field='pk_extension', $sort_order='asc', $items_per_page=0, $page_number=1) {
    	$pdo = database::pdo();

		/* Calculate the $limit / $offset based on $items_per_page / $page_number */
		if ($items_per_page == 0) {
			$limit  = 9999;
			$offset = 0;
		} else {
			$limit  = $items_per_page;
			$offset = ($page_number-1) * $items_per_page;
		}

		/* Run the sql query */
		$query = $pdo->prepare('SELECT * FROM ext_dialtone LIMIT :limit OFFSET :offset');
		// TODO: Implemente sorting 
		// $query = $pdo->prepare('SELECT * FROM ext_dialtone ORDER BY :sort_field LIMIT :limit OFFSET :offset');
		// $query->bindValue(':sort_field', $sort_field, PDO::PARAM_STR);
		// $query->bindValue(':sort_order', $sort_order, PDO::PARAM_STR);
		$query->bindParam(':limit'     , $limit     , PDO::PARAM_INT);
		$query->bindParam(':offset'    , $offset    , PDO::PARAM_INT);
		$query->execute();
		if ($query->errorCode() != '00000') {
			$error = $query->errorInfo();
			throw new Exception($error[2]);
		}

		$ret = $query->fetchAll(PDO::FETCH_ASSOC);
		return $ret;
	}

	static function retrive($pk_extension) {
		$pdo = database::pdo();

		$extension = extensions::retrive($pk_extension);
		
		/* Get general information about this dialtone */
		$query = $pdo->prepare("SELECT * FROM ext_dialtone WHERE pk_extension=:pk_extension	LIMIT 1	");
		$query->bindParam(':pk_extension', $pk_extension, PDO::PARAM_INT);
		$query->execute();
		if ($query->errorCode() != '00000') {
			$error = $query->errorInfo();
			throw new Exception($error[2]);
		}
		$ret = $query->fetch(PDO::FETCH_ASSOC);

		/* If we have no results at the last query, return a null array */
		if (empty($ret)) {
			return null;
		}
		$ret = array_merge($extension, $ret);

		return $ret;
	}

	static function save($data) {
		$pdo = database::pdo();
		
		/* set a flag if this is a newly created extension */
		if ($data['pk_extension'] == "") {
			$create_new = true;
		}

		/* force type to dialtone */
		$data['type'] = 'dialtone';
		
		/* triger a save on the extensions tables */
		$data['pk_extension'] = extensions::save($data);
		
		/* create a record in the ext_dialtone table if this is a newly created extension */
		if ($create_new) {
			$query = $pdo->prepare("INSERT INTO ext_dialtone(pk_extension) VALUES(:pk_extension)");
			$query->bindParam(':pk_extension', $data['pk_extension'], PDO::PARAM_INT);
			$query->execute();
			if ($query->errorCode() != '00000') {
				$error = $query->errorInfo();
				throw new Exception($error[2]);
			}
		}

		/* update the dialtone password */
		$query = $pdo->prepare("UPDATE ext_dialtone SET password = :password WHERE pk_extension = :pk_extension");
		$query->bindParam(':password'    , $data['password']   , PDO::PARAM_STR);
		$query->bindParam(':pk_extension', $data['pk_extension'], PDO::PARAM_INT);
		$query->execute();
		if ($query->errorCode() != '00000') {
			$error = $query->errorInfo();
			throw new Exception($error[2]);
		}

		return $data['pk_extension'];
	}

	static function validate($data) {
		$errors = array();

		/* validate first against the extensions table */
		$errors = extensions::validate($data);

		/* if a password was supplied for this dialtone, check if is valid */
		if(!empty($data['password'])){
			if(! preg_match('/^[0-9]{3,10}$/', $data['password'])) {
				$errors['password']['invalid'] = true;
			}
		}
		
		return $errors;
	}

	static function generate() {
		$ret = extensions::generate();

		return $ret;
	}

	static function delete($pk_extension) {
		$pdo = database::pdo();
		
		/* Delete from the extensions table */
		extensions::delete($pk_extension);

		/* Delete entry from the dialtone extensions table */
		$query = $pdo->prepare("DELETE FROM ext_dialtone WHERE pk_extension = :pk_extension");
		$query->bindParam(':pk_extension', $pk_extension, PDO::PARAM_INT);
		$query->execute();
		if ($query->errorCode() != '00000') {
			$error = $query->errorInfo();
			throw new Exception($error[2]);
		}
	}
}