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//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef Patternist_XsdStateMachine_H
#define Patternist_XsdStateMachine_H

#include "qnamepool_p.h"

#include <QtCore/QHash>
#include <QtCore/QSet>
#include <QtCore/QTextStream>

class QIODevice;

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short A state machine used for evaluation.
     *
     * @ingroup Patternist_schema
     * @author Tobias Koenig <tobias.koenig@trolltech.com>
     */
    template <typename TransitionType>
    class XsdStateMachine
    {
        public:
            typedef qint32 StateId;

            /**
             * Describes the type of state.
             */
            enum StateType
            {
                StartState,     ///< The state the machine will start with.
                StartEndState,  ///< The state the machine will start with, can be end state as well.
                InternalState,  ///< Any state that is not start or end state.
                EndState        ///< Any state where the machine is allowed to stop.
            };

            /**
             * Creates a new state machine object.
             */
            XsdStateMachine();

            /**
             * Creates a new state machine object.
             *
             * The name pool to use for accessing object names.
             */
            XsdStateMachine(const NamePool::Ptr &namePool);

            /**
             * Adds a new state of the given @p type to the state machine.
             *
             * @return The id of the new state.
             */
            StateId addState(StateType type);

            /**
             * Adds a new @p transition to the state machine.
             *
             * @param start The start state.
             * @param transition The transition to come from the start to the end state.
             * @param end The end state.
             */
            void addTransition(StateId start, TransitionType transition, StateId end);

            /**
             * Adds a new epsilon @p transition to the state machine.
             *
             * @param start The start state.
             * @param end The end state.
             */
            void addEpsilonTransition(StateId start, StateId end);

            /**
             * Resets the machine to the start state.
             */
            void reset();

            /**
             * Removes all states and transitions from the state machine.
             */
            void clear();

            /**
             * Continues execution of the machine with the given input @p transition.
             *
             * @return @c true if the transition was successfull, @c false otherwise.
             */
            bool proceed(TransitionType transition);

            /**
             * Returns the list of transitions that are reachable from the current
             * state.
             */
            QList<TransitionType> possibleTransitions() const;

            /**
             * Continues execution of the machine with the given @p input.
             *
             * @note To use this method, inputEqualsTransition must be implemented
             *       to find the right transition to use.
             *
             * @return @c true if the transition was successfull, @c false otherwise.
             */
            template <typename InputType>
            bool proceed(InputType input);

            /**
             * Returns whether the given @p input matches the given @p transition.
             */
            template <typename InputType>
            bool inputEqualsTransition(InputType input, TransitionType transition) const;

            /**
             * Returns whether the machine is in an allowed end state.
             */
            bool inEndState() const;

            /**
             * Returns the last transition that was taken.
             */
            TransitionType lastTransition() const;

            /**
             * Returns the start state of the machine.
             */
            StateId startState() const;

            /**
             * This method should be redefined by template specialization for every
             * concret TransitionType.
             */
            QString transitionTypeToString(TransitionType type) const;

            /**
             * Outputs the state machine in DOT format to the given
             * output @p device.
             */
            bool outputGraph(QIODevice *device, const QString &graphName) const;

            /**
             * Returns a DFA that is equal to the NFA of the state machine.
             */
            XsdStateMachine<TransitionType> toDFA() const;

            /**
             * Returns the information of all states of the state machine.
             */
            QHash<StateId, StateType> states() const;

            /**
             * Returns the information of all transitions of the state machine.
             */
            QHash<StateId, QHash<TransitionType, QVector<StateId> > > transitions() const;

        private:
            /**
             * Returns the DFA state for the given @p nfaStat from the given @p stateTable.
             * If there is no corresponding DFA state yet, a new one is created.
             */
            StateId dfaStateForNfaState(QSet<StateId> nfaState, QList< QPair< QSet<StateId>, StateId> > &stateTable, XsdStateMachine<TransitionType> &dfa) const;

            /**
             * Returns the set of all states that can be reached from the set of @p input states
             * by the epsilon transition.
             */
            QSet<StateId> epsilonClosure(const QSet<StateId> &input) const;

            /**
             * Returns the set of all states that can be reached from the set of given @p states
             * by the given @p input.
             */
            QSet<StateId> move(const QSet<StateId> &states, TransitionType input) const;

            NamePool::Ptr                                             m_namePool;
            QHash<StateId, StateType>                                 m_states;
            QHash<StateId, QHash<TransitionType, QVector<StateId> > > m_transitions;
            QHash<StateId, QVector<StateId> >                         m_epsilonTransitions;
            StateId                                                   m_currentState;
            qint32                                                    m_counter;
            TransitionType                                            m_lastTransition;
    };

    #include "qxsdstatemachine.cpp"
}

QT_END_NAMESPACE

QT_END_HEADER

#endif