#pragma once
#include <chrono>
#include <list>
#include <string>
#include <exception>

/* header definitions are based on
 * Development and Implementation of a New Trigger and
 * Data Acquisition System for the HADES Detector (2012)
 * by Jan Michel
 * chapter 5.1
 */


class TrbBridgeTrbNetHeaderException : public std::exception {
public:
   explicit TrbBridgeTrbNetHeaderException(const std::string& what_arg = "") : _what(what_arg) {}
   virtual const char* what() const throw() {return _what.c_str();}
    
private:
   std::string _what;
};

struct TrbBridgeTrbNetEventHeader {
   uint32_t size; /**< size in bytes incl header and padding (should by dividable by 8 but not enforced here */
   uint16_t triggerType;
   uint32_t eventNumberPerFile; /**< i-th event in hld file */
   std::time_t timestamp;
   uint32_t runNumber; /**< random run number that all events in an hld file share */
   
   bool swappedEndianess;
   
   /**
    * Adds padding (if necessary) and sets size.
    * @return size of padding required in bytes
    */
   size_t setSizeWithPadding(size_t sizeWoPadding);
   
   
   /**
    * Write values defined above into buffer.
    * 
    * @param buffer Destination to write to; require >=32 bytes of space
    */
   void writeToBuffer(uint32_t *buffer) const;
   
   /**
    * Load values defined above from buffer
    *
    * @param buffer Pointer to first word of header
    */ 
   void loadFromBuffer(const uint32_t* buffer);
   
   /**
    * synonym for loadFromBuffer.
    */
   TrbBridgeTrbNetEventHeader operator<<(const uint32_t* buffer);
};

uint32_t* operator<<(uint32_t* buffer, const TrbBridgeTrbNetEventHeader & evtHdr);


struct TrbBridgeTrbNetSubEventHeader {
   uint32_t size; /**< size in bytes incl header and padding (should by dividable by 8 but not enforced here */
   uint16_t subEventId; /**< "endpoint id" */
   uint32_t triggerNumber; /**< sequential trigger number generated by CTS */
   uint8_t  triggerCode; /**< random trigger code generated by CTS */
   uint8_t  triggerType; /**< not specified, but GbE and CBMNet bridge include it never-the-less */
   
   bool swappedEndianess;
   
   /**
    * Write values defined above into buffer.
    * 
    * @param buffer Destination to write to; require >=16 bytes of space
    */
   void writeToBuffer(uint32_t *buffer) const;
   
   /**
    * Load values defined above from buffer
    *
    * @param buffer Pointer to first word of header
    */ 
   void loadFromBuffer(const uint32_t* buffer);
   
   /**
    * synonym for loadFromBuffer.
    */
   TrbBridgeTrbNetSubEventHeader operator<<(const uint32_t* buffer);
};

uint32_t* operator<<(uint32_t* buffer, const TrbBridgeTrbNetSubEventHeader & subEvtHdr);

struct TrbBridgeTrbNetSubSubEventHeader {
   uint16_t  subSubEventId;
   uint16_t  size; /**< size in bytes incl. header */
   uint32_t* payload;
   
   TrbBridgeTrbNetSubSubEventHeader(unsigned int ssEvtId=0, unsigned int size=0, uint32_t* payload=0);
   
   /**
    * Searches for all sub-sub-events with-in an sub-event
    * @param subEventHeader
    * @param buffer Pointer to the first word of the sub-event (i.e. the header)
    * @return list of sub-sub-events found
    */
   static std::list<TrbBridgeTrbNetSubSubEventHeader> extractSubSubEvents(const TrbBridgeTrbNetSubEventHeader & subEventHeader, uint32_t* buffer) throw (TrbBridgeTrbNetHeaderException);
};