//===================================================================================================================
//
// file :        Pipe.h
//
// description :    Include file for the Pipe class.
//
// project :        TANGO
//
// author(s) :        E.Taurel
//
// Copyright (C) :      2014,2015
//                        European Synchrotron Radiation Facility
//                      BP 220, Grenoble 38043
//                      FRANCE
//
// This file is part of Tango.
//
// Tango is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Tango 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License along with Tango.
// If not, see <http://www.gnu.org/licenses/>.
//
//
//===================================================================================================================

#ifndef _PIPE_H
#define _PIPE_H

#include <tango/common/tango_const.h>
#include <tango/client/DevicePipe.h>
#include <tango/server/attribute.h>
#include <tango/server/classpipe.h>

#include <cstdarg>
#include <string>
#include <vector>

namespace Tango
{
class UserDefaultPipeProp;

enum PipeSerialModel
{
    PIPE_NO_SYNC = 0,
    PIPE_BY_KERNEL,
    PIPE_BY_USER
};

/**
 * This class is a class representing a pipe in the TANGO device server pattern. It is an abstract class.
 * It is the root class for all pipe related classes.
 *
 *
 * @headerfile tango.h
 * @ingroup Server
 */

class Pipe
{
  public:
    /**@name Constructors
     * Miscellaneous constructors */
    //@{
    /**
     * Constructs a newly allocated Pipe object.
     *
     * The default constructor
     */
    Pipe() :
        ext(new PipeExt)
    {
    }

    /**
     * Constructs a newly allocated Pipe object from its
     * name and its display level
     *
     * @param     name    The pipe name
     * @param    level    The pipe display level
     * @param    pwt        The pipe R/W type (default to READ)
     *
     */
    Pipe(const std::string &name, Tango::DispLevel level, PipeWriteType pwt = PIPE_READ);

    //@}

    /**@name Destructor
     * Only one destructor is defined for this class */
    //@{
    /**
     * The object desctructor.
     */
    virtual ~Pipe() { }

    //@}

    /**@name Miscellaneous methods */
    //@{

    //@}

    /**@name Get/Set object members.
     * These methods allows the external world to get/set Pipe instance
     * data members
     */
    //@{
    /**
     * Return the pipe name.
     *
     * @return The pipe name
     */
    std::string &get_name()
    {
        return name;
    }

    /**
     * Set the pipe name.
     *
     * @param new_name The new pipe name
     */
    void set_name(const std::string &new_name)
    {
        name = new_name;
    }

    /**
     * Set default attribute properties
     *
     * @param    prop    The user default property class
     */
    void set_default_properties(const UserDefaultPipeProp &prop);

    /**
     * Return the pipe name in lower case letters.
     *
     * @return The pipe name
     */
    std::string &get_lower_name()
    {
        return lower_name;
    }

    /**
     * Return the root data blob name.
     *
     * @return The data blob name
     */
    const std::string &get_root_blob_name()
    {
        return the_blob.get_name();
    }

    /**
     * Set the root data blob name.
     *
     * @param [in] name The root data blob name
     */
    void set_root_blob_name(const std::string &name)
    {
        the_blob.set_name(name);
    }

    /**
     * Return the pipe description.
     *
     * @return The pipe description
     */
    std::string &get_desc()
    {
        return desc;
    }

    /**
     * Return the pipe label.
     *
     * @return The pipe label
     */
    std::string &get_label()
    {
        return label;
    }

    /**
     * Return the pipe display level.
     *
     * @return The pipe display level
     */
    Tango::DispLevel get_disp_level()
    {
        return disp_level;
    }

    /**
     * Get the pipe writable type (RO/RW).
     *
     * @return The pipe write type.
     */
    Tango::PipeWriteType get_writable()
    {
        return writable;
    }

    /**
     * Set pipe serialization model
     *
     * This method allows the user to choose the pipe serialization model.
     *
     * @param [in] ser_model The new serialisation model. The serialization model must be
     * one of PIPE_BY_KERNEL, PIPE_BY_USER or PIPE_NO_SYNC
     */
    void set_pipe_serial_model(PipeSerialModel ser_model);

    /**
     * Get pipe serialization model
     *
     * Get the pipe serialization model
     *
     * @return The pipe serialization model
     */
    PipeSerialModel get_pipe_serial_model()
    {
        return pipe_serial_model;
    }

    /**
     * Set pipe user mutex
     *
     * This method allows the user to give to the pipe object the pointer to
     * the omni_mutex used to protect its buffer. The mutex has to be locked when passed
     * to this method. The Tango kernel will unlock it when the data will be transferred
     * to the client.
     *
     * @param [in] mut_ptr The user mutex pointer
     */
    void set_user_pipe_mutex(omni_mutex *mut_ptr)
    {
        user_pipe_mutex = mut_ptr;
    }

//@}

/**@name Inserting data into a DevicePipe
 */
//@{
#ifdef GEN_DOC
    /**
     * Insert data into a device pipe
     *
     * Inserting data into a Pipe instance is simlar to inserting data into a DevicePipeBlob class instance.
     * See doc of DevicePipeBlob class insertion methods (DevicePipeBlob::operator<<) to get a complete documentation on
     * how to insert data into a Pipe object
     *
     * @param [in] datum The data to be inserted into the Pipe object
     * @exception WrongData if requested
     */
    Pipe &operator<<(short &datum);
#endif
    /**
     * Set blob data element number
     *
     * Set the blob data element number
     *
     * @param [in] nb The blob data element number
     */
    void set_data_elt_nb(size_t nb)
    {
        the_blob.set_data_elt_nb(nb);
    }

    /**
     * Set blob data element number and names
     *
     * Set the blob data element number and names. The data element number is the number of names in the input
     * parameter.
     *
     * @param [in] names The blob data element names
     */
    void set_data_elt_names(const std::vector<std::string> &names)
    {
        the_blob.set_data_elt_names(names);
    }

    /**
     * Get blob data element number
     *
     * Get the blob data element number
     *
     * @return The blob data element number
     */
    size_t get_data_elt_nb()
    {
        return the_blob.get_data_elt_nb();
    }

    //@}

    /**@name Exception and error related methods methods
     */
    //@{
    /**
     * Set exception flag
     *
     * It's a method which allows the user to switch on/off exception throwing when trying to insert/extract data from a
     * Pipe object. The following flags are supported :
     * @li @b isempty_flag - throw a WrongData exception (reason = API_EmptyDataElement) if user
     *       tries to extract data from one empty blob data element. By default, this flag
     *       is set
     * @li @b wrongtype_flag - throw a WrongData exception (reason = API_IncompatibleArgumentType) if user
     *       tries to extract data with a type different than the type used for insertion. By default, this flag
     *       is set
     * @li @b notenoughde_flag - throw a WrongData exception (reason = API_PipeWrongArg) if user
     *       tries to extract data from a DevicePipeBlob for a data element which does not exist. By default, this flag
     *       is set
     * @li @b blobdenamenotset_flag - Throw a WrongData exception (reason = API_PipeNoDataElement) if user tries to
     *       insert data into the blob while the name or number of data element has not been set with methods
     *       set_data_elt_nb() or set_data_elt_names()
     * @li @b mixing_flag - Throw a WrongData exception (reason = API_NotSupportedFeature) if user tries to mix
     *          insertion/extraction method (<< or >>) with operator[]
     *
     * @param [in] fl The exception flag
     */
    void exceptions(std::bitset<DevicePipeBlob::numFlags> fl)
    {
        the_blob.exceptions(fl);
    }

    /**
     * Get exception flag
     *
     * Returns the whole exception flags.
     * The following is an example of how to use these exceptions related methods
     * @code
     * Pipe pi;
     *
     * std::bitset<DevicePipeBlob::numFlags> bs = pi.exceptions();
     * TANGO_LOG << "bs = " << bs << std::endl;
     *
     * pi.set_exceptions(DevicePipeBlob::wrongtype_flag);
     * bs = pi.exceptions();
     *
     * TANGO_LOG << "bs = " << bs << std::endl;
     * @endcode
     *
     * @return The exception flag
     */
    std::bitset<DevicePipeBlob::numFlags> exceptions()
    {
        return the_blob.exceptions();
    }

    /**
     * Reset one exception flag
     *
     * Resets one exception flag
     *
     * @param [in] fl The exception flag
     */
    void reset_exceptions(DevicePipeBlob::except_flags fl)
    {
        the_blob.reset_exceptions(fl);
    }

    /**
     * Set one exception flag
     *
     * Sets one exception flag. See DevicePipeBlob::exceptions() for a usage example.
     *
     * @param [in] fl The exception flag
     */
    void set_exceptions(DevicePipeBlob::except_flags fl)
    {
        the_blob.set_exceptions(fl);
    }

    /**
     * Check insertion/extraction success
     *
     * Allow the user to check if insertion/extraction into/from Pipe instance was successfull. This
     * method has to be used when exceptions are disabled.
     *
     * @return True if insertion/extraction has failed
     */
    bool has_failed()
    {
        return the_blob.has_failed();
    }

    /**
     * Get instance insertion/extraction state
     *
     * Allow the user to find out what was the reason of insertion/extraction into/from Pipe failure. This
     * method has to be used when exceptions are disabled.
     * Here is an example of how methods has_failed() and state() could be used
     * @code
     * Pipe dpb = ....
     *
     * std::bitset<DevicePipeBlob::numFlags> bs;
     * bs.reset();
     * dpb.exceptions(bs);
     *
     * DevLong dl;
     * dpb >> dl;
     *
     * if (dpb.has_failed() == true)
     * {
     *    std::bitset<DevicePipeBlob::numFlags> bs_err = dpb.state();
     *    if (dpb.test(DevicePipeBlob::isempty_flag) == true)
     *        .....
     * }
     * @endcode
     *
     * @return The error bit set.
     */
    std::bitset<DevicePipeBlob::numFlags> state()
    {
        return the_blob.state();
    }

    //@}

    /**@name set_value methods.
     * Methods to set the value of the data blob to be transported by the pipe
     */
    //@{

    //@}

    /// @privatesection
    virtual bool is_allowed(DeviceImpl *dev, PipeReqType)
    {
        (void) dev;
        return true;
    }

    virtual void read(DeviceImpl *) { }

    Pipe &operator[](const std::string &);

    bool get_value_flag()
    {
        return value_flag;
    }

    void set_value_flag(bool val)
    {
        value_flag = val;
    }

    void set_time();

    Tango::TimeVal &get_when()
    {
        return when;
    }

    void set_returned_data_ptr(DevPipeData *_p)
    {
        ret_data = _p;
    }

    void set_label(const std::string &_lab)
    {
        label = _lab;
    }

    void set_desc(const std::string &_desc)
    {
        desc = _desc;
    }

    bool is_label_lib_default()
    {
        return label == name;
    }

    bool is_desc_lib_default()
    {
        return desc == DescNotSpec;
    }

    void set_upd_properties(const PipeConfig &, DeviceImpl *);
    void set_properties(const Tango::PipeConfig &, DeviceImpl *, std::vector<Attribute::AttPropDb> &);
    void upd_database(std::vector<Attribute::AttPropDb> &, const std::string &);

    std::vector<PipeProperty> &get_user_default_properties()
    {
        return user_def_prop;
    }

    void set_one_str_prop(const char *,
                          const CORBA::String_member &,
                          std::string &,
                          std::vector<Attribute::AttPropDb> &,
                          std::vector<PipeProperty> &,
                          std::vector<PipeProperty> &,
                          const char *);
    bool prop_in_list(const char *, std::string &, size_t, std::vector<PipeProperty> &);

    DevicePipeBlob &get_blob()
    {
        return the_blob;
    }

    omni_mutex *get_pipe_mutex()
    {
        return &pipe_mutex;
    }

    omni_mutex *get_user_pipe_mutex()
    {
        return user_pipe_mutex;
    }

    void fire_event(DeviceImpl *, DevFailed *);
    void fire_event(DeviceImpl *, DevicePipeBlob *, bool);
    void fire_event(DeviceImpl *, DevicePipeBlob *, const TangoTimestamp &, bool);

    void set_event_subscription(time_t _t)
    {
        event_subscription = _t;
    }

    bool is_pipe_event_subscribed() const;

    friend class EventSupplier;
    friend class ZmqEventSupplier;

  protected:
    /**@name Class data members */
    //@{
    /**
     * The pipe name
     */
    std::string name;
    /**
     * The pipe name in lower case
     */
    std::string lower_name;
    /**
     * The pipe description
     */
    std::string desc;
    /**
     * The pipe label
     */
    std::string label;
    /**
     * The pipe display level
     */
    Tango::DispLevel disp_level;
    /**
     * The pipe R/W type
     */
    Tango::PipeWriteType writable;
    //@}

    DevicePipeBlob the_blob;

  private:
    class PipeExt
    {
      public:
        PipeExt() { }
    };

    std::unique_ptr<PipeExt> ext; // Class extension

    bool value_flag;              // Flag set when pipe value is set
    Tango::TimeVal when;          // Date associated to the pipe
    Tango::DevPipeData *ret_data; // Pointer for read data

    std::vector<std::string> pe_out_names; // Data elements name
    int rec_count;                         // Data elements ctr

    PipeSerialModel pipe_serial_model; // Flag for attribute serialization model

    omni_mutex pipe_mutex;       // Mutex to protect the pipe shared data buffer
    omni_mutex *user_pipe_mutex; // Ptr for user mutex in case he manages exclusion

    time_t event_subscription;               // Last time() a subscription was made
    std::vector<PipeProperty> user_def_prop; // User default properties
};

template <typename T>
Pipe &operator<<(Pipe &, T &);

template <typename T>
Pipe &operator<<(Pipe &, T *);

template <typename T>
Pipe &operator<<(Pipe &, DataElement<T> &);

//
// Throw exception if pointer is null
//

#define PIPE_CHECK_PTR(A, B, C)                                                      \
    if(A == nullptr)                                                                 \
    {                                                                                \
        std::stringstream o;                                                         \
        o << "Data pointer for pipe " << B << ", data element " << C << " is NULL!"; \
        TANGO_THROW_EXCEPTION(API_PipeOptProp, o.str());                             \
    }                                                                                \
    else                                                                             \
        (void) 0

//
// Some inline methods
//

//+------------------------------------------------------------------------------------------------------------------
//
// method :
//        Pipe::prop_in_list
//
// description :
//        Search for a property in a list
//        A similar method exists in Attribute class!!
//
// args:
//        in :
//            - prop_name : The property name
//          - list_size : The size list
//          - list : The list
//      out :
//            - prop_str : String initialized with prop. value (if found)
//
//------------------------------------------------------------------------------------------------------------------

inline bool
    Pipe::prop_in_list(const char *prop_name, std::string &prop_str, size_t list_size, std::vector<PipeProperty> &list)
{
    bool ret = false;

    if(list_size != 0)
    {
        size_t i;
        for(i = 0; i < list_size; i++)
        {
            if(list[i].get_name() == prop_name)
            {
                break;
            }
        }
        if(i != list_size)
        {
            prop_str = list[i].get_value();
            ret = true;
        }
    }

    return ret;
}

} // namespace Tango

#endif // _PIPE_H
