//*******************************************************
// MessageFolder Object: Keeps a folder of CMessage objects
// AUTHOR: Chris Wild
// DATE: July 25, 1997
// Revised: January 17, 1999
//*******************************************************
#ifndef MESSAGEFOLDER_H
#define MESSAGEFOLDER_H
#include "Message.h"
#include "ListMsgs.h"
#include <windows.h>
typedef int msgID;

const int NULL_ID = 0;
class CMsgFolder
{
public:
	
	//************* constructors and destructors
	CMsgFolder();	// default
	// opens (or creates a folder called "folderName" in current directory
	CMsgFolder(const char* folderName);
	// Writes out open messages and folder information
	~CMsgFolder();
	
	// Puts a message in the folder
	bool PostMsg(const CMessage& msg);
	
	// PRE: message with "messageID" exists
	// gets message with ID "messageId"
	// returns true if successful else false
	bool GetMsg(msgID messageId, CMessage & thisMsg) const;
	
	// PRE: message with "messageID" exists
	// topic points to a string big enough to hold topic string
	// POST: if exists, returns true and topic of this message
	//	else returns false
	bool GetMsgTopic(msgID messageId, char* topic) const;
	
	// PRE: message with "messageID" exists
	// POST: deletes this message (renumbering messages)
	// Deletes message with msgID "messageID"
    // removes from MsgList and deletes Message file
	// returns false if 1) no folder open
	// 2) message does not exists in list
	// 3) file cannot be deleted
	// returns true is successfull

	bool DeleteMsg(msgID messageID);
	
	// POST: returns the number of messages in this folder
	int NumMsgs() const;

	// POST: Closes this folder making it undefined
	// returns false if problem closing folder else true
	bool CloseMsgFolder();

	// POST: Open folder with "folderName"
	// Will close previously open folder first
	// returns true is opened successfully else false
	bool OpenMsgFolder(const char* folderName);
private:
	char* folderName; // name of folder directory
	HANDLE messages; // handle to open message folder
	CListMsgs msgList;	// list of available messages
	int nextMsgNum;	// unique number for next message 
	bool verifyFolder(const char*); // opens(creates) message folder
};

#endif