#ifndef BOARD_H
#define BOARD_H

#include <QtCore/QDateTime>
#include <QtCore/QHash>
#include <QtCore/QPair>
#include <QtCore/QRegExp>
#include <QtCore/QSet>
#include <QtCore/QTimer>
#include <QtCore/QQueue>
#include <QtCore/QUrl>
#include <QtCore/QVariant>
#include <QtSql/QSqlDatabase>

class Action;
class XmlRpcInterface;

class Board : public QObject
{
	Q_OBJECT
	Q_PROPERTY(bool busy READ busy NOTIFY busyChanged)
	Q_PROPERTY(bool loggedIn READ loggedIn NOTIFY loggedInChanged)
	Q_PROPERTY(int rootForumId READ rootForumId CONSTANT)
	Q_ENUMS(TopicType)
	Q_FLAGS(DateTimePrecisionOptions)

public:
	explicit Board(QObject *parent = 0);
	Board(const QUrl& url, const QString& username, const QString& password, QObject *parent = 0);
    ~Board();

	enum TopicType {
		Normal = 0,
		Sticky = 1,
		Announcement = 2
	};

	enum DateTimePrecisionOption {
		ShowTime = 1 << 0,
		RelativeTime = 1 << 1,   // "n second(s) ago" instead of "Today HH:MM"
		TodayYesterday = 1 << 2, // "Today", "Yesterday" and "Today HH:MM" if ShowTime
		RelativeDate = 1 << 3    // "n week(s) ago", incompatible with ShowTime
	};
	Q_DECLARE_FLAGS(DateTimePrecisionOptions, DateTimePrecisionOption)

	static const QLatin1String CURRENT_DB_VERSION;

	bool busy() const;

	void enqueueAction(Action* action);

	QSqlDatabase database();
	XmlRpcInterface *service();

	int rootForumId() const;

	// Configuration table
	Q_INVOKABLE QString getConfig(const QString& key) const;
	void setConfig(const QString& key, const QString &value);

	// Login/logout stuff
	QVariant getLoginInfo(const QString& key) const;
	bool loggedIn() const;
	void login(const QString& username, const QString& password);
	void logout();

	// Other functions that query the database
	int getTopicForumId(int topicId);

	// Posting stuff
	Q_INVOKABLE void newTopic(int forumId, const QString& subject, const QString& text);
	Q_INVOKABLE void replyToTopic(int topicId, const QString& text);

	// BBCode-related helper functions
	QString removeHtml(QString text) const;
	QString removeBbcode(QString text) const;
	QString bbcodeToRichText(QString text) const;
	QString parseSmilies(QString text) const;

	Q_INVOKABLE QString formatDateTime(const QDateTime& dateTime, DateTimePrecisionOptions precision) const;

public slots:
	void cancelAllActions();

	// These functions wrap emitting the signals below
	void notifyConfigChanged(const QString& key = QString());
	void notifyForumsChanged();
	void notifyForumChanged(int forumId);
	void notifyForumTopicsChanged(int forumId, Board::TopicType type, int start, int end);
	void notifyForumTopicChanged(int forumId, int topicId);
	void notifyTopicPostsChanged(int topicId, int start, int end);
	void notifyTopicPostsUnread(int topicId, int position);
	void notifyLogin(const QMap<QString, QVariant>& info);
	void notifyLogout();

	// Functions for marking posts as read
	void markTopicAsRead(int topicId);

signals:
	void busyChanged();
	void loggedInChanged();
	void configChanged(const QString& key);
	void forumsChanged();
	void forumChanged(int forumId);
	void forumTopicsChanged(int forumId, Board::TopicType type, int start, int end);
	void forumTopicChanged(int forumId, int topicId);
	void topicPostsChanged(int topicId, int start, int end);
	void topicPostsUnread(int topicId, int position);

private:
	static QString createSlug(const QUrl& url);
	static QString getDbPathFor(const QString& slug);
	static QString getTempDbPathFor(const QString& slug);
	int dbSize() const;
	bool checkCompatibleDb();
	bool initializeDb();
	bool eraseDb();
	bool cleanDb();
	bool removeFromActionQueue(Action *action);
	void executeActionFromQueue();
	void initializeBbCode();
	void initializeSmilies();
	void fetchConfigIfOutdated();
	void fetchForumsIfOutdated();
	void updateForumReadState(int forumId);

private slots:
	void handleActionFinished(Action *action);
	void handleActionError(Action *action, const QString& message);

private:
	QUrl _url;
	QString _slug;
	QSqlDatabase _db;
	XmlRpcInterface *_iface;
	/** The queue of pending actions. The first one is currently being run. */
	QQueue<Action*> _queue;
	/** Configuration cache */
	mutable QHash<QString, QString> _config;
	/** Login information, which is obviously not persistent. */
	QMap<QString, QVariant> _loginInfo;
	/** Bbcodes list and their HTML replacements for quick-and-dirty parsing. */
	QList< QPair<QRegExp, QString> > _bbcodes;
	/** List of smilies and their replacements. */
	QHash<QString, QString> _smilies;
	/** A regular expression that matches every possibly smilie. */
	QRegExp _smilieRegexp;
};

Q_DECLARE_OPERATORS_FOR_FLAGS(Board::DateTimePrecisionOptions)

inline bool Board::busy() const
{
	return !_queue.empty();
}

inline bool Board::loggedIn() const
{
	return !_loginInfo.empty();
}

inline int Board::rootForumId() const
{
	return 0;
}

inline QSqlDatabase Board::database()
{
	return _db;
}

inline XmlRpcInterface * Board::service()
{
	return _iface;
}

#endif // BOARD_H