<?php
/**
 * ownCloud - Addressbook
 *
 * @author Jakob Sack
 * @copyright 2011 Jakob Sack mail@jakobsack.de
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library 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 library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
/*
 *
 * The following SQL statement is just a help for developers and will not be
 * executed!
 *
 * CREATE TABLE contacts_addressbooks (
 * id INT(11) UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT,
 * userid VARCHAR(255) NOT NULL,
 * displayname VARCHAR(255),
 * uri VARCHAR(100),
 * description TEXT,
 * ctag INT(11) UNSIGNED NOT NULL DEFAULT '1'
 * );
 *
 */
/**
 * This class manages our addressbooks.
 */
class OC_Contacts_Addressbook {
	/**
	 * @brief Returns the list of addressbooks for a specific user.
	 * @param string $uid
	 * @param boolean $active Only return addressbooks with this $active state, default(=false) is don't care
	 * @return array or false.
	 */
	public static function all($uid, $active=false) {
		$values = array($uid);
		$active_where = '';
		if ($active) {
			$active_where = ' AND active = ?';
			$values[] = 1;
		}
		try {
			$stmt = OCP\DB::prepare( 'SELECT * FROM *PREFIX*contacts_addressbooks WHERE userid = ? ' . $active_where . ' ORDER BY displayname' );
			$result = $stmt->execute($values);
		} catch(Exception $e) {
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.' exception: '.$e->getMessage(), OCP\Util::ERROR);
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.' uid: '.$uid, OCP\Util::DEBUG);
			return false;
		}

		$addressbooks = array();
		while( $row = $result->fetchRow()) {
			$addressbooks[] = $row;
		}
		$addressbooks = array_merge($addressbooks, OCP\Share::getItemsSharedWith('addressbook', OC_Share_Backend_Addressbook::FORMAT_ADDRESSBOOKS));
		if(!$active && !count($addressbooks)) {
			self::addDefault($uid);
		}
		return $addressbooks;
	}

	/**
	 * @brief Get active addressbook IDs for a user.
	 * @param integer $uid User id. If null current user will be used.
	 * @return array
	 */
	public static function activeIds($uid = null) {
		if(is_null($uid)) {
			$uid = OCP\USER::getUser();
		}
		$activeaddressbooks = self::all($uid, true);
		$ids = array();
		foreach($activeaddressbooks as $addressbook) {
			$ids[] = $addressbook['id'];
		}
		return $ids;
	}

	/**
	 * @brief Returns the list of active addressbooks for a specific user.
	 * @param string $uid
	 * @return array
	 */
	public static function active($uid) {
		return self::all($uid, true);
	}

	/**
	 * @brief Returns the list of addressbooks for a principal (DAV term of user)
	 * @param string $principaluri
	 * @return array
	 */
	public static function allWherePrincipalURIIs($principaluri){
		$uid = self::extractUserID($principaluri);
		return self::all($uid);
	}

	/**
	 * @brief Gets the data of one address book
	 * @param integer $id
	 * @return associative array or false.
	 */
	public static function find($id) {
		try {
			$stmt = OCP\DB::prepare( 'SELECT * FROM *PREFIX*contacts_addressbooks WHERE id = ?' );
			$result = $stmt->execute(array($id));
		} catch(Exception $e) {
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', exception: '.$e->getMessage(), OCP\Util::ERROR);
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', id: '.$id, OCP\Util::DEBUG);
			return false;
		}

		return $result->fetchRow();
	}

	/**
	 * @brief Adds default address book
	 * @return $id ID of the newly created addressbook or false on error.
	 */
	public static function addDefault($uid = null) {
		if(is_null($uid)) {
			$uid = OCP\USER::getUser();
		}
		$id = self::add($uid, 'Contacts', 'Default Address Book');
		if($id !== false) {
			self::setActive($id, true);
		}
		return $id;
	}
	
	/**
	 * @brief Creates a new address book
	 * @param string $userid
	 * @param string $name
	 * @param string $description
	 * @return insertid
	 */
	public static function add($uid,$name,$description='') {
		try {
			$stmt = OCP\DB::prepare( 'SELECT uri FROM *PREFIX*contacts_addressbooks WHERE userid = ? ' );
			$result = $stmt->execute(array($uid));
		} catch(Exception $e) {
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.' exception: '.$e->getMessage(), OCP\Util::ERROR);
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.' uid: '.$uid, OCP\Util::DEBUG);
			return false;
		}
		$uris = array();
		while($row = $result->fetchRow()){
			$uris[] = $row['uri'];
		}

		$uri = self::createURI($name, $uris );
		try {
			$stmt = OCP\DB::prepare( 'INSERT INTO *PREFIX*contacts_addressbooks (userid,displayname,uri,description,ctag) VALUES(?,?,?,?,?)' );
			$result = $stmt->execute(array($uid,$name,$uri,$description,1));
		} catch(Exception $e) {
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', exception: '.$e->getMessage(), OCP\Util::ERROR);
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', uid: '.$uid, OCP\Util::DEBUG);
			return false;
		}

		return OCP\DB::insertid('*PREFIX*contacts_addressbooks');
	}

	/**
	 * @brief Creates a new address book from the data sabredav provides
	 * @param string $principaluri
	 * @param string $uri
	 * @param string $name
	 * @param string $description
	 * @return insertid or false
	 */
	public static function addFromDAVData($principaluri,$uri,$name,$description) {
		$uid = self::extractUserID($principaluri);

		try {
			$stmt = OCP\DB::prepare('INSERT INTO *PREFIX*contacts_addressbooks (userid,displayname,uri,description,ctag) VALUES(?,?,?,?,?)');
			$result = $stmt->execute(array($uid,$name,$uri,$description,1));
		} catch(Exception $e) {
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', exception: '.$e->getMessage(), OCP\Util::ERROR);
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', uid: '.$uid, OCP\Util::DEBUG);
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', uri: '.$uri, OCP\Util::DEBUG);
			return false;
		}

		return OCP\DB::insertid('*PREFIX*contacts_addressbooks');
	}

	/**
	 * @brief Edits an addressbook
	 * @param integer $id
	 * @param string $name
	 * @param string $description
	 * @return boolean
	 */
	public static function edit($id,$name,$description) {
		// Need these ones for checking uri
		$addressbook = self::find($id);

		if(is_null($name)) {
			$name = $addressbook['name'];
		}
		if(is_null($description)) {
			$description = $addressbook['description'];
		}

		try {
			$stmt = OCP\DB::prepare('UPDATE *PREFIX*contacts_addressbooks SET displayname=?,description=?, ctag=ctag+1 WHERE id=?');
			$result = $stmt->execute(array($name,$description,$id));
		} catch(Exception $e) {
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', exception: '.$e->getMessage(), OCP\Util::ERROR);
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', id: '.$id, OCP\Util::DEBUG);
			return false;
		}

		return true;
	}

	/**
	 * @brief Activates an addressbook
	 * @param integer $id
	 * @param boolean $active
	 * @return boolean
	 */
	public static function setActive($id,$active) {
		$sql = 'UPDATE *PREFIX*contacts_addressbooks SET active = ? WHERE id = ?';
		OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', id: '.$id.', active: '.intval($active), OCP\Util::ERROR);
		try {
			$stmt = OCP\DB::prepare($sql);
			$stmt->execute(array(intval($active), $id));
			return true;
		} catch(Exception $e) {
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', exception for '.$id.': '.$e->getMessage(), OCP\Util::ERROR);
			return false;
		}
	}

	/**
	 * @brief Checks if an addressbook is active.
	 * @param integer $id ID of the address book.
	 * @return boolean
	 */
	public static function isActive($id) {
		$sql = 'SELECT active FROM *PREFIX*contacts_addressbooks WHERE id = ?';
		try {
			$stmt = OCP\DB::prepare( $sql );
			$result = $stmt->execute(array($id));
			$row = $result->fetchRow();
			return (bool)$row['active'];
		} catch(Exception $e) {
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', exception: '.$e->getMessage(), OCP\Util::ERROR);
		}
	}

	/**
	 * @brief removes an address book
	 * @param integer $id
	 * @return boolean
	 */
	public static function delete($id) {
		self::setActive($id, false);
		try {
			$stmt = OCP\DB::prepare( 'DELETE FROM *PREFIX*contacts_addressbooks WHERE id = ?' );
			$stmt->execute(array($id));
		} catch(Exception $e) {
			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', exception for '.$id.': '.$e->getMessage(), OCP\Util::ERROR);
			return false;
		}
		
		$cards = OC_Contacts_VCard::all($id);
		foreach($cards as $card){
			OC_Contacts_VCard::delete($card['id']);
		}

		return true;
	}

	/**
	 * @brief Updates ctag for addressbook
	 * @param integer $id
	 * @return boolean
	 */
	public static function touch($id) {
		$stmt = OCP\DB::prepare( 'UPDATE *PREFIX*contacts_addressbooks SET ctag = ctag + 1 WHERE id = ?' );
		$stmt->execute(array($id));

		return true;
	}

	/**
	 * @brief Creates a URI for Addressbook
	 * @param string $name name of the addressbook
	 * @param array  $existing existing addressbook URIs
	 * @return string new name
	 */
	public static function createURI($name,$existing) {
		$name = str_replace(' ', '_', strtolower($name));
		$newname = $name;
		$i = 1;
		while(in_array($newname, $existing)) {
			$newname = $name.$i;
			$i = $i + 1;
		}
		return $newname;
	}

	/**
	 * @brief gets the userid from a principal path
	 * @return string
	 */
	public static function extractUserID($principaluri) {
		list($prefix, $userid) = Sabre_DAV_URLUtil::splitPath($principaluri);
		return $userid;
	}
}