OGrazingPigs.cpp

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//
// OGrazingPigs.cpp
//
/*
*******************************************************************************************************
Copyright (c) 2011, Christopher John Topping, University of Aarhus
All rights reserved.
 
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the following disclaimer in the documentation and/or other materials provided with the distribution.
 
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
 
#include "../../Landscape/ls.h"
#include "../../Landscape/cropprogs/OGrazingPigs.h"
 
bool OGrazingPigs::Do( Farm *a_farm, LE *a_field, FarmEvent *a_ev )
{
  m_farm  = a_farm;
  m_field = a_field;
  m_ev    = a_ev;
 
  bool done = false;
 
  switch ( m_ev->m_todo )
  {
  case ogp_start:
  {
      // Set up the date management stuff
      m_last_date=g_date->DayInYear(2,11);
      m_field->SetMDates(0,0,g_date->DayInYear(2,11));
      m_field->SetMDates(1,0,g_date->DayInYear(2,11));
 
      // This is a nasty one because it runs one year from when it starts, less one
      // month
      // So if the next crop is an autumn one - then it will push the year on one
      // We cannot allow this - the rotation will be out of sync. So only spring crops
      // can follow this
      if ((m_ev->m_startday>g_date->DayInYear(1, 7)) && m_ev->m_startday<g_date->DayInYear(1, 11)) // This allows pigs to follow pigs
      {
          g_msg->Warn( WARN_BUG, "GrazingPigs::Do(): "
                 "Autumn Crop Following Grazing Pigs is not allowed!!!", "" );
          exit( 1 );
      }
      if ( ! m_ev->m_first_year )
      {
        int today=g_date->Date();
        // Are we before July 1st?
        int d1 = g_date->OldDays() + g_date->DayInYear( 1,7 );
        if (today < d1)
        {
          // Yes, too early. We assumme this is because the last crop was late
          g_msg->Warn( WARN_BUG, "GrazingPigs::Do(): "
                "Crop start attempt between 1st Jan & 1st July", "" );
          exit( 1 );
        }
        else
        {
          d1 = g_date->OldDays() + m_first_date; // Add 365 for spring crop
          if (today > d1)
          {
            // Yes too late - should not happen - raise an error
            g_msg->Warn( WARN_BUG, "GrazingPigs::Do(): "
               "Crop start attempt after last possible start date", "" );
            exit( 1 );
          }
        }
      }
      // OK so if we reach here it is after 1/7 and before 1,11
 
      m_field->SetLastSownVeg( m_field->GetVegType() ); //Force last sown, needed for goose habitat classification
 
      int d1=g_date->OldDays() + m_first_date;
      PGP_FIRST_PIGS_IN_DATE=d1+334; // 31 days less than one year
      PGP_LAST_PIGS_IN_DATE=d1+355;  //  just less than one year later (So not near the max before 1,11)
      SimpleEvent( d1, ogp_pigs_out, false );
      break;
  }
  case ogp_pigs_out:
  {
    if (!m_farm->PigsOut( m_field, 0.0,
         PGP_LAST_PIGS_IN_DATE - g_date->Date())) {
      SimpleEvent( g_date->Date() + 1, ogp_pigs_out, true );
      break;
    }
    SimpleEvent( g_date->Date() + 1, ogp_pigs_are_out_forced, false );
    break;
 
  case ogp_pigs_are_out_forced:
    // Keep the pigs out there
    m_farm->PigsAreOutForced( m_field, 0.0, 0 );
    // PGP_FIRST_PIGS_IN_DATE specifies the first day the pigs may come home.
    // However this event type forces them to stay out. Thus we want to
    // abandon this chain of events one day before PGP_FIRST_PIGS_IN_DATE.
    if ( g_date->Date() < PGP_FIRST_PIGS_IN_DATE - 1 )
    {
      SimpleEvent( g_date->Date() + 1, ogp_pigs_are_out_forced, false );
      break;
        }
    SimpleEvent( g_date->Date() + 1, ogp_pigs_are_out, false );
  }
  break;
 
  case ogp_pigs_are_out:
    // Start testing for taking the pigs home.
    // PigsAreOut() returns false if it is not time to stop grazing
    if (!m_farm->PigsAreOut( m_field, 0.0,
         PGP_LAST_PIGS_IN_DATE - g_date->Date())) {
        // --FN--
      SimpleEvent( g_date->Date() + 1, ogp_pigs_are_out, true );
      break;
    }
    done=true;
    break;
 
  default:
    g_msg->Warn( WARN_BUG, "OGrazingPigs::Do(): "
         "Unknown event type! ", "" );
    exit( 1 );
  }
 
  return done;
}