//
// VMime library (http://vmime.sourceforge.net)
// Copyright (C) 2002-2004 Vincent Richard <vincent@vincent-richard.net>
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of
// the License, or (at your option) any later version.
//
// This program 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//

#ifndef VMIME_MESSAGING_FOLDER_HPP_INCLUDED
#define VMIME_MESSAGING_FOLDER_HPP_INCLUDED


#include <vector>

#include "../types.hpp"
#include "../dateTime.hpp"
#include "progressionListener.hpp"
#include "message.hpp"
#include "../message.hpp"
#include "events.hpp"
#include "../utility/path.hpp"
#include "../utility/stream.hpp"


namespace vmime {
namespace messaging {


class store;


/** Abstract representation of a folder in a message store.
  */

class folder
{
protected:

	folder(const folder&) { }
	folder() { }

public:

	virtual ~folder() { }

	/** Type used for fully qualified path name of a folder.
	  */
	typedef vmime::utility::path path;


	/** Open mode.
	  */
	enum Modes
	{
		MODE_READ_ONLY,    /**< Read-only mode (no modification to folder or messages is possible). */
		MODE_READ_WRITE    /**< Full access mode (read and write). */
	};

	/** Folder types.
	  */
	enum Types
	{
		TYPE_CONTAINS_FOLDERS  = (1 << 0),   /**< Folder can contain folders. */
		TYPE_CONTAINS_MESSAGES = (1 << 1),   /**< Folder can contain messages. */

		TYPE_UNDEFINED = 9999                /**< Used internally (this should not be returned
		                                          by the type() function). */
	};

	/** Folder flags.
	  */
	enum Flags
	{
		FLAG_CHILDREN = (1 << 0),   /**< Folder contains subfolders. */
		FLAG_NO_OPEN  = (1 << 1),   /**< Folder cannot be open. */

		FLAG_UNDEFINED = 9999       /**< Used internally (this should not be returned
		                                 by the type() function). */
	};

	/** Return the type of this folder.
	  *
	  * @return folder type (see folder::Types)
	  */
	virtual const int getType() = 0;

	/** Return the flags of this folder.
	  *
	  * @return folder flags (see folder::Flags)
	  */
	virtual const int getFlags() = 0;

	/** Return the mode in which the folder has been open.
	  *
	  * @return folder opening mode (see folder::Modes)
	  */
	virtual const int getMode() const = 0;

	/** Return the name of this folder.
	  *
	  * @return folder name
	  */
	virtual const folder::path::component getName() const = 0;

	/** Return the fully qualified path name of this folder.
	  *
	  * @return absolute path of the folder
	  */
	virtual const folder::path getFullPath() const = 0;

	/** Open this folder.
	  *
	  * @param mode open mode (see folder::Modes)
	  * @param failIfModeIsNotAvailable if set to false and if the requested mode
	  * is not available, a more restricted mode will be selected automatically.
	  * If set to true and if the requested mode is not available, the opening
	  * will fail.
	  */
	virtual void open(const int mode, bool failIfModeIsNotAvailable = false) = 0;

	/** Close this folder.
	  *
	  * @param expunge if set to true, deleted messages are expunged
	  */
	virtual void close(const bool expunge) = 0;

	/** Create this folder.
	  *
	  * @param type folder type (see folder::Types)
	  */
	virtual void create(const int type) = 0;

	/** Test whether this folder exists.
	  *
	  * @return true if the folder exists, false otherwise
	  */
	virtual const bool exists() = 0;

	/** Test whether this folder is open.
	  *
	  * @return true if the folder is open, false otherwise
	  */
	virtual const bool isOpen() const = 0;

	/** Get a new reference to a message in this folder.
	  *
	  * @param num message sequence number
	  * @return a new object referencing the specified message
	  */
	virtual message* getMessage(const int num) = 0;

	/** Get new references to messages in this folder.
	  *
	  * @param from sequence number of the first message to get
	  * @param to sequence number of the last message to get
	  * @return new objects referencing the specified messages
	  */
	virtual std::vector <message*> getMessages(const int from = 1, const int to = -1) = 0;

	/** Get new references to messages in this folder.
	  *
	  * @param nums sequence numbers of the messages to delete
	  * @return new objects referencing the specified messages
	  */
	virtual std::vector <message*> getMessages(const std::vector <int>& nums) = 0;

	/** Return the number of messages in this folder.
	  *
	  * @return number of messages in the folder
	  */
	virtual const int getMessageCount() = 0;

	/** Get a new reference to a sub-folder in this folder.
	  *
	  * @param name sub-folder name
	  * @return a new object referencing the specified folder
	  */
	virtual folder* getFolder(const folder::path::component& name) = 0;

	/** Get the list of all sub-folders in this folder.
	  *
	  * @param recursive if set to true, all the descendant are returned.
	  * If set to false, only the direct children are returned.
	  * @return list of sub-folders
	  */
	virtual std::vector <folder*> getFolders(const bool recursive = false) = 0;

	/** Rename (move) this folder to another location.
	  *
	  * @param newPath new path of the folder
	  */
	virtual void rename(const folder::path& newPath) = 0;

	/** Remove a message in this folder.
	  *
	  * @param num sequence number of the message to delete
	  */
	virtual void deleteMessage(const int num) = 0;

	/** Remove one or more messages from this folder.
	  *
	  * @param from sequence number of the first message to delete
	  * @param to sequence number of the last message to delete
	  */
	virtual void deleteMessages(const int from = 1, const int to = -1) = 0;

	/** Remove one or more messages from this folder.
	  *
	  * @param nums sequence numbers of the messages to delete
	  */
	virtual void deleteMessages(const std::vector <int>& nums) = 0;

	/** Change the flags for one or more messages in this folder.
	  *
	  * @param from sequence number of the first message to modify
	  * @param to sequence number of the last message to modify
	  * @param flags set of flags (see message::Flags)
	  * @param mode indicate how to treat old and new flags (see message::FlagsModes)
	  */
	virtual void setMessageFlags(const int from, const int to, const int flags, const int mode = message::FLAG_MODE_SET) = 0;

	/** Change the flags for one or more messages in this folder.
	  *
	  * @param nums sequence numbers of the messages to modify
	  * @param flags set of flags (see message::Flags)
	  * @param mode indicate how to treat old and new flags (see message::FlagsModes)
	  */
	virtual void setMessageFlags(const std::vector <int>& nums, const int flags, const int mode = message::FLAG_MODE_SET) = 0;

	/** Add a message to this folder.
	  *
	  * @param msg message to add (data: header + body)
	  * @param flags flags for the new message
	  * @param date date/time for the new message (if NULL, the current time is used)
	  * @param progress progression listener, or NULL if not used
	  */
	virtual void addMessage(vmime::message* msg, const int flags = message::FLAG_UNDEFINED, vmime::datetime* date = NULL, progressionListener* progress = NULL) = 0;

	/** Add a message to this folder.
	  *
	  * @param is message to add (data: header + body)
	  * @param size size of the message to add (in bytes)
	  * @param flags flags for the new message
	  * @param date date/time for the new message (if NULL, the current time is used)
	  * @param progress progression listener, or NULL if not used
	  */
	virtual void addMessage(utility::inputStream& is, const int size, const int flags = message::FLAG_UNDEFINED, vmime::datetime* date = NULL, progressionListener* progress = NULL) = 0;

	/** Copy a message from this folder to another folder.
	  *
	  * @param dest destination folder path
	  * @param num sequence number of the message to copy
	  */
	virtual void copyMessage(const folder::path& dest, const int num) = 0;

	/** Copy messages from this folder to another folder.
	  *
	  * @param dest destination folder path
	  * @param from sequence number of the first message to copy
	  * @param to sequence number of the last message to copy
	  */
	virtual void copyMessages(const folder::path& dest, const int from = 1, const int to = -1) = 0;

	/** Copy messages from this folder to another folder.
	  *
	  * @param dest destination folder path
	  * @param nums sequence numbers of the messages to copy
	  */
	virtual void copyMessages(const folder::path& dest, const std::vector <int>& nums) = 0;

	/** Request folder status without opening it.
	  *
	  * @param count will receive the number of messages in the folder
	  * @param unseen will receive the number of unseen messages in the folder
	  */
	virtual void status(int& count, int& unseen) = 0;

	/** Expunge deleted messages.
	  */
	virtual void expunge() = 0;

	/** Return a new folder objet referencing the parent folder of this folder.
	  *
	  * @return parent folder object
	  */
	virtual folder* getParent() = 0;

	/** Return a reference to the store to which this folder belongs.
	  *
	  * @return the store object to which this folder is attached
	  */
	virtual const store* getStore() const = 0;

	/** Return a reference to the store to which this folder belongs.
	  *
	  * @return the store object to which this folder is attached
	  */
	virtual store* getStore() = 0;

	/** Possible fetchable objects.
	  */
	enum FetchOptions
	{
		FETCH_ENVELOPE = (1 << 0),       /**< Fetch sender, recipients, date, subject. */
		FETCH_STRUCTURE = (1 << 1),      /**< Fetch structure (body parts). */
		FETCH_CONTENT_INFO = (1 << 2),   /**< Fetch top-level content type. */
		FETCH_FLAGS = (1 << 3),          /**< Fetch message flags. */
		FETCH_SIZE = (1 << 4),           /**< Fetch message size (exact or estimated). */
		FETCH_FULL_HEADER = (1 << 5),    /**< Fetch full RFC-[2]822 header. */
		FETCH_UID = (1 << 6),            /**< Fetch unique identifier (protocol specific). */

		FETCH_CUSTOM = (1 << 16)         /**< Reserved for future use. */
	};

	/** Fetch objects for the specified messages.
	  *
	  * @param msg list of message sequence numbers
	  * @param options objects to fetch (combination of folder::FetchOptions flags)
	  * @param progress progression listener, or NULL if not used
	  */
	virtual void fetchMessages(std::vector <message*>& msg, const int options, progressionListener* progress = NULL) = 0;

	/** Fetch objects for the specified message.
	  *
	  * @param msg the message
	  * @param options objects to fetch (combination of folder::FetchOptions flags)
	  */
	virtual void fetchMessage(message* msg, const int options) = 0;

	/** Return the list of fetchable objects supported by
	  * the underlying protocol (see folder::FetchOptions).
	  *
	  * @return list of supported fetchable objects
	  */
	virtual const int getFetchCapabilities() const = 0;

	// Event listeners
	void addMessageChangedListener(events::messageChangedListener* l);
	void removeMessageChangedListener(events::messageChangedListener* l);

	void addMessageCountListener(events::messageCountListener* l);
	void removeMessageCountListener(events::messageCountListener* l);

	void addFolderListener(events::folderListener* l);
	void removeFolderListener(events::folderListener* l);

protected:

	void notifyMessageChanged(const events::messageChangedEvent& event);
	void notifyMessageCount(const events::messageCountEvent& event);
	void notifyFolder(const events::folderEvent& event);

private:

	std::list <events::messageChangedListener*> m_messageChangedListeners;
	std::list <events::messageCountListener*> m_messageCountListeners;
	std::list <events::folderListener*> m_folderListeners;
};


} // messaging
} // vmime


#endif // VMIME_MESSAGING_FOLDER_HPP_INCLUDED