/*
  dmp.h

  Copyright (c) 2020 Kevin Matz (kevin.matz@gmail.com)

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/
#pragma once

#include <cstdint>
#include <memory>
#include <vector>
#include "acn/pdu.h"

// Architecture for Control Networks – Device Management Protocol
namespace ACN::DMP {

/**
 * @brief 5.1.4 Address and Data Types
 */
enum data_type {
  SINGLE = 0b00, //!< Non-range address, Single data item
  RANGE  = 0b01, //!< Range address, Single data item
  ARRAY  = 0b10, //!< Range address, Array of equal size data items
  SERIES = 0b11  //!< Range address, Series of mixed size data items
};


/**
 * @brief The address_length enum
 */
enum address_length {
  ONE  = 0b00, // 0
  TWO  = 0b01, // 1
  FOUR = 0b10, // 2
  ZERO = 0b11  // 3 (reserved)
};


/**
 * @brief address_width
 * @param l
 * @return
 */
inline unsigned int address_width(const address_length& l)
{
  switch (l) {
    case ONE:  return 1;
    case TWO:  return 2;
    case FOUR: return 4;
    default:   return 0;
    }
}


/**
 * @brief The address_type struct
 */
struct address_type
    : PDU::pdu_header
{
  union {
    uint8_t byte           = 0;
    struct __attribute__((packed)) {
      address_length width : 2;   // A1, A0
      uint8_t   x_reserved : 2;   // X1, X0
      data_type type       : 2;   // D1, D0
      bool      relative   : 1;   // R
      bool      z_reserved : 1;   // Z
    };
  };

  size_t streamSize()           const override { return 1; }
  void   iStream(PDU::Stream s)       override { *s >> byte; }
  void   oStream(PDU::Stream s) const override { *s << byte; }
};


/**
 * @brief 5.1.5 The range struct
 */
/// TODO: maybe template this struct based on address_length
struct range
    : PDU::pdu_stream_object
{
  range(const data_type t, const address_length l)
    : type_(t)
    , length_(l)
  {};
  uint32_t address   = 0;
  uint32_t incriment = 0;
  uint32_t count     = 0;

  size_t streamSize() const override;
  void   iStream(PDU::Stream) override;
  void   oStream(PDU::Stream) const override;

private:
  const data_type type_;
  const address_length length_;
  uint32_t read_(PDU::Stream);
  void     write_(PDU::Stream, const uint32_t&) const;
};


/**
 * @brief set_property
 */
typedef std::pair<range, std::vector<uint8_t>> address_data_pair;


/**
 * @brief The address_pair_list struct
 */
struct address_pair_list
    : PDU::pdu_data
{
  address_pair_list(const address_type* t) : type_(t) {};
  std::vector<address_data_pair> properties;

  size_t streamSize() const override;
  void   iStream(PDU::Stream) override;
  void   oStream(PDU::Stream) const override;

private:
  const address_type* type_;
};


/**
 * @brief The address_list struct
 */
struct address_list
    : PDU::pdu_data
{
  address_list(const address_type* t) : type_(t) {};
  std::vector<range> addresses;

  size_t streamSize() const override;
  void   iStream(PDU::Stream) override;
  void   oStream(PDU::Stream) const override;

private:
  const address_type* type_;
};


/**
 * @brief 7 Response Messages
 */
enum failure_reason {
  NONSPECIFIC  = 1, //!< Non-specific or non-DMP reason.
  NOT_PROPERTY = 2, //!< The address does not correspond to a property.
  WRITE_ONLY   = 3, //!< The property’s value may not be read.
  NOT_WRITABLE = 4, //!< The property’s value may not be written.
  DATA_ERROR   = 5, //!< The data does not correspond to the property.
  SUBSCIRPTION_NOT_SUPPORTED = 10, //!< Subscriptions on the specified property are not supported by the device.
  NO_SUBSCRIPTIONS_SUPPORTED = 11, //!< Subscriptions not supported on any property.
  INSUFFICIENT_RESOURCES = 12, //!< The component cannot support more subscriptions due to resource limitations
  UNAVAILABLE  = 13 //!< The property’s value is not available due to restrictions imposed by device specific functionality (e.g., access permission mechanisms).
};


/**
 * @brief 13.1 Protocol Codes
 */
static const uint32_t DMP_PROTOCOL_ID   = 2; //!< protocol vector

// 13.2 Message Codes
static const uint8_t GET_PROPERTY       = 1;
static const uint8_t SET_PROPERTY       = 2;
static const uint8_t GET_PROPERTY_REPLY = 3;
static const uint8_t EVENT              = 4;
static const uint8_t SUBSCRIBE          = 7;
static const uint8_t UNSUBSCRIBE        = 8;
static const uint8_t GET_PROPERTY_FAIL  = 9;
static const uint8_t SET_PROPERTY_FAIL  = 10;
static const uint8_t SUBSCRIBE_ACCEPT   = 12;
static const uint8_t SUBSCRIBE_REJECT   = 13;
static const uint8_t SYNC_EVENT         = 17;


/**
 * @brief The DMP::Pdu class
 */
class Pdu
  : public PDU::Pdu
{
public:
  Pdu();
  void iStream(PDU::Stream) override;
};


} // ACN::DMP