// %pacpus:license{
// This file is part of the PACPUS framework distributed under the
// CECILL-C License, Version 1.0.
// %pacpus:license}
/// @file
/// @author  Gerald Dhermobez <firstname.surname@utc.fr>
/// @author  Marek Kurdej <firstname.surname@utc.fr>
/// @author  Samuel Gosselin <firstname.surname@utc.fr>
/// @author  Julien Moras <firstname.surname@utc.fr>
/// @date    February, 2006
/// @version $Id: ComponentBase.h 76 2013-01-10 17:05:10Z kurdejma $
/// @copyright Copyright (c) UTC/CNRS Heudiasyc 2006 - 2013. All rights reserved.
/// @brief Generic ComponentBase class. This is an abstract class.
///
/// Detailed description.
/// @todo        - see if some methods can be private with ComponentManager
///              friendship
///              - include the copy of Xml node in param here
///              - see if there is a possibility to avoid the constraint
///              on parameters in the constructor of derived class

#ifndef DEF_PACPUS_COMPONENTBASE_H
#define DEF_PACPUS_COMPONENTBASE_H

#include <Pacpus/kernel/ComponentManager.h>
#include <Pacpus/kernel/InputOutputBase.h>
// InputOutputInterface.h must be included, otherwise we could not use addInput, addOutput template methods
#include <Pacpus/kernel/InputOutputInterface.h>
#include <Pacpus/kernel/PacpusLibConfig.h>
#include <Pacpus/kernel/XmlComponentConfig.h>

#include <QString>
#include <QMap>

#include <boost/program_options/options_description.hpp>
#include <boost/program_options/value_semantic.hpp>
#include <string>

class QWidget;

namespace boost {
namespace program_options {
    class options_description_easy_init;
}
}

namespace pacpus {

class ComponentManager;

class InputInterfaceBase;
class OutputInterfaceBase;

template <typename T, class C>
class InputInterface;
template <typename T, class C>
class OutputInterface;

using ::boost::program_options::value;

/// @brief Base class of a Pacpus component.
class PACPUSLIB_API ComponentBase
{
    friend class ComponentManager;

public:
    /// Enumeration of the state that can take a component, the three last states suppose
    /// that the component is started.
    enum COMPONENT_STATE {
        STOPPED,
        NOT_MONITORED,
        MONITOR_OK,
        MONITOR_NOK
    };

    /// Resulting state of a component after its configuration.
    enum COMPONENT_CONFIGURATION {
        CONFIGURED_OK,
        NOT_CONFIGURED,
        CONFIGURATION_DELAYED,
        CONFIGURED_FAILED
    };

    /// Ctor of ComponentBase.
    /// @param name Name of your component.
    ComponentBase(const QString & name);

    /// Dtor of ComponentBase.
    virtual ~ComponentBase();

    /// Returns the state of the component.
    /// @return Value of the current state.
    COMPONENT_STATE getState();

    /// Checks whether the component if configurer or not.
    /// @return @b true if the component is configured, otherwise @b false.
    bool isConfigured() const;

    /// Returns the name of the component.
    /// @return Name of the component.
    QString getName() const;
    
    /// @returns @b true if the component has been started and is active (working)
    bool isActive() const;

protected:
    /// Changes the state of the component.
    /// @param state New component state.
    void setState(COMPONENT_STATE state);

    /// Called when the component starts, you must override this function.
    virtual void startActivity() = 0;

    /// Called when the component stops, you must override this function.
    virtual void stopActivity() = 0;

    /// Called by the ComponentManager, it configure the component thanks a XML node.
    /// @param config Component's XML node.
    /// @return State of the configuration.
    /// @todo FIXME: 'config' should be const, but it will be a breaking change
    /// old stuff.
    virtual COMPONENT_CONFIGURATION configureComponent(XmlComponentConfig config) = 0;

    // virtual QString getType() = 0;

    /// @todo FIXME: should be pure virtual, but it will be a breaking change
    virtual void addInputs() {}
    virtual void addOutputs() {}

    /// Returns an object permitting to add component parameters.
    ::boost::program_options::options_description_easy_init addParameters();
    
protected:
    typedef QMap<QString, InputInterfaceBase *> InputsMap;
    typedef QMap<QString, OutputInterfaceBase *> OutputsMap;

    // TODO: use std::function<void (const DataType &)>
    // TODO: use std::mem_fun<void (const DataType &)>
    template <typename DataType, class ComponentType, typename Function>
    void addInput(const char * name, Function function)
    {
        typedef InputInterface<DataType, ComponentType> InputType;
        InputType * connection = new InputType(name, dynamic_cast<ComponentType *>(this), function);
        inputs().insert(name, connection);
    }

    template <typename DataType, class ComponentType>
    void addOutput(const char * name)
    {
        typedef OutputInterface<DataType, ComponentType> OutputType;
        OutputType * connection = new OutputType(name, dynamic_cast<ComponentType *>(this));
        outputs().insert(name, connection);
    }
    
    /// @todo DOC
    InputInterfaceBase * getInput(QString name) const;

    /// @todo DOC
    OutputInterfaceBase * getOutput(QString name) const;

    template <typename DataType, class ComponentType>
    InputInterface<DataType, ComponentType> *
        getTypedInput(const char * name) const
    {
        return dynamic_cast<InputInterface<DataType, ComponentType> *>(getInput(name));
    }

    template <typename DataType, class ComponentType>
    OutputInterface<DataType, ComponentType> *
        getTypedOutput(const char * name) const
    {
        return dynamic_cast<OutputInterface<DataType, ComponentType> *>(getOutput(name));
    }

    void setActive(bool isActive);
    bool isRecording() const;
    void setRecording(bool isRecording);

    InputsMap & inputs();
    const InputsMap & inputs() const;
    OutputsMap & outputs();
    const OutputsMap & outputs() const;

    COMPONENT_CONFIGURATION configurationState() const;
    void setConfigurationState(COMPONENT_CONFIGURATION state);

    const XmlComponentConfig xmlParameters() const;

protected:
    std::string mName;
    std::string mTypeName;
    
    /// Whether to display or not the graphical interface (GUI)
    bool hasGui() const;
    bool isOutputVerbose() const;
    int getVerbosityLevel() const;
    
private:
    /// Called by ComponentManager to handle parameters
    /// @throws
    void parseParameters(const XmlComponentConfig & cfg);

    /// called by the ComponentManager to start the component
    int startComponent();

    /// called by the ComponentManager to stop the component
    int stopComponent();

private:
    bool mHasGui;
    bool mVerbose;
    int mVerbosityLevel;

    boost::program_options::options_description mOptionsDescription;

    /// The XML node that is got in the configureComponent method
    XmlComponentConfig param;

    /// the name of the component. It is this one in the XML config file
    QString m_componentName;
    
    /// is the component active?
    volatile bool m_isActive;

    /// is the component is recording data?
    bool mIsRecording;

    /// a pointer to the manager of components
    ComponentManager * m_manager;

    InputsMap m_inputs;
    OutputsMap m_outputs;

    /// a pointer to an optional widget
    QWidget * m_ui;

    /// store the state of the component
    COMPONENT_STATE m_componentState;

    /// is the component configured (ie configureComponent method was called)
    COMPONENT_CONFIGURATION m_configurationState;
};

} // pacpus

#endif // DEF_PACPUS_COMPONENTBASE_H