#ifndef LOCAL_TIME_CUSTOM_TIME_ZONE_HPP__

#define LOCAL_TIME_CUSTOM_TIME_ZONE_HPP__

/* Copyright (c) 2003-2005 CrystalClear Software, Inc.

 * Subject to the Boost Software License, Version 1.0. 

 * (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)

 * Author: Jeff Garland, Bart Garst

 * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $

 */

#include "boost/date_time/time_zone_base.hpp"

#include "boost/date_time/time_zone_names.hpp"

#include "boost/date_time/posix_time/posix_time.hpp"

#include "boost/date_time/local_time/dst_transition_day_rules.hpp"

#include "boost/date_time/string_convert.hpp"

//#include "boost/date_time/special_defs.hpp"

#include "boost/shared_ptr.hpp"

namespace boost {

namespace local_time {

  //typedef boost::date_time::time_zone_names time_zone_names;

  typedef boost::date_time::dst_adjustment_offsets<boost::posix_time::time_duration> dst_adjustment_offsets;

  //typedef boost::date_time::time_zone_base<boost::posix_time::ptime> time_zone;

  typedef boost::shared_ptr<dst_calc_rule> dst_calc_rule_ptr;

  //! A real time zone

  template<class CharT>

  class custom_time_zone_base : public date_time::time_zone_base<posix_time::ptime,CharT> {

  public:

    typedef boost::posix_time::time_duration time_duration_type;

    typedef date_time::time_zone_base<posix_time::ptime,CharT> base_type;

    typedef typename base_type::string_type string_type;

    typedef typename base_type::stringstream_type stringstream_type;

    typedef date_time::time_zone_names_base<CharT> time_zone_names;

    typedef CharT char_type;

    custom_time_zone_base(const time_zone_names& zone_names,   

                     const time_duration_type& utc_offset,

                     const dst_adjustment_offsets& dst_shift,

                     boost::shared_ptr<dst_calc_rule> calc_rule) :

      zone_names_(zone_names),

      base_utc_offset_(utc_offset),

      dst_offsets_(dst_shift),

      dst_calc_rules_(calc_rule)

    {};

    virtual ~custom_time_zone_base() {};

    virtual string_type dst_zone_abbrev() const

    {

      return zone_names_.dst_zone_abbrev();

    }

    virtual string_type std_zone_abbrev() const

    {

      return zone_names_.std_zone_abbrev();

    }

    virtual string_type dst_zone_name() const

    {

      return zone_names_.dst_zone_name();

    }

    virtual string_type std_zone_name() const

    {

      return zone_names_.std_zone_name();

    }

    //! True if zone uses daylight savings adjustments

    virtual bool has_dst() const

    {

      return (dst_calc_rules_); //if calc_rule is set the tz has dst

    }

    //! Local time that DST starts -- NADT if has_dst is false

    virtual posix_time::ptime dst_local_start_time(gregorian::greg_year y) const

    {

      gregorian::date d(gregorian::not_a_date_time);

      if (dst_calc_rules_) {

        d = dst_calc_rules_->start_day(y);

      }

      return posix_time::ptime(d, dst_offsets_.dst_start_offset_);

    }

    //! Local time that DST ends -- NADT if has_dst is false

    virtual posix_time::ptime dst_local_end_time(gregorian::greg_year y) const

    {

      gregorian::date d(gregorian::not_a_date_time);

      if (dst_calc_rules_) {

        d = dst_calc_rules_->end_day(y);

      }

      return posix_time::ptime(d, dst_offsets_.dst_end_offset_);

    }

    //! Base offset from UTC for zone (eg: -07:30:00)

    virtual time_duration_type base_utc_offset() const

    {

      return base_utc_offset_;

    }

    //! Adjustment forward or back made while DST is in effect

    virtual time_duration_type dst_offset() const

    {

      return dst_offsets_.dst_adjust_;

    }

    //! Returns a POSIX time_zone string for this object

    virtual string_type to_posix_string() const

    {

      // std offset dst [offset],start[/time],end[/time] - w/o spaces

      stringstream_type ss;

      ss.fill('0');

      boost::shared_ptr<dst_calc_rule> no_rules;

      // std

      ss << std_zone_abbrev();

      // offset

      if(base_utc_offset().is_negative()) {

        // inverting the sign guarantees we get two digits

        ss << '-' << std::setw(2) << base_utc_offset().invert_sign().hours();

      }

      else {

        ss << '+' << std::setw(2) << base_utc_offset().hours();

      }

      if(base_utc_offset().minutes() != 0 || base_utc_offset().seconds() != 0) {

        ss << ':' << std::setw(2) << base_utc_offset().minutes();

        if(base_utc_offset().seconds() != 0) {

          ss << ':' << std::setw(2) << base_utc_offset().seconds();

        }

      }

      if(dst_calc_rules_ != no_rules) {

        // dst

        ss << dst_zone_abbrev();

        // dst offset

        if(dst_offset().is_negative()) {

          // inverting the sign guarantees we get two digits

          ss << '-' << std::setw(2) << dst_offset().invert_sign().hours();

        }

        else {

          ss << '+' << std::setw(2) << dst_offset().hours();

        }

        if(dst_offset().minutes() != 0 || dst_offset().seconds() != 0) {

          ss << ':' << std::setw(2) << dst_offset().minutes();

          if(dst_offset().seconds() != 0) {

            ss << ':' << std::setw(2) << dst_offset().seconds();

          }

        }

        // start/time

        ss << ',' << date_time::convert_string_type<char, char_type>(dst_calc_rules_->start_rule_as_string()) << '/'

           << std::setw(2) << dst_offsets_.dst_start_offset_.hours() << ':'

           << std::setw(2) << dst_offsets_.dst_start_offset_.minutes();

        if(dst_offsets_.dst_start_offset_.seconds() != 0) {

          ss << ':' << std::setw(2) << dst_offsets_.dst_start_offset_.seconds();

        }

        // end/time

        ss << ',' << date_time::convert_string_type<char, char_type>(dst_calc_rules_->end_rule_as_string()) << '/'

           << std::setw(2) << dst_offsets_.dst_end_offset_.hours() << ':'

           << std::setw(2) << dst_offsets_.dst_end_offset_.minutes();

        if(dst_offsets_.dst_end_offset_.seconds() != 0) {

          ss << ':' << std::setw(2) << dst_offsets_.dst_end_offset_.seconds();

        }

      }

      return ss.str();

    }

  private:

    time_zone_names zone_names_;

    bool has_dst_;

    time_duration_type base_utc_offset_;

    dst_adjustment_offsets dst_offsets_;

    boost::shared_ptr<dst_calc_rule> dst_calc_rules_;

  };

  typedef custom_time_zone_base<char> custom_time_zone;

} }//namespace

#endif