/*
 * EasyWave - A realtime tsunami simulation program with GPU support.
 * Copyright (C) 2014  Andrey Babeyko, Johannes Spazier
 * GFZ German Research Centre for Geosciences (http://www.gfz-potsdam.de)
 *
 * Parts of this program (especially the GPU extension) were developed
 * within the context of the following publicly funded project:
 * - TRIDEC, EU 7th Framework Programme, Grant Agreement 258723
 *   (http://www.tridec-online.eu)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <utilits.h>
#include "easywave.h"

//#define SSHMAX_TO_SINGLE_FILE 0

static int MaxPOIs;
int NPOIs;
static char **idPOI;
long *idxPOI;
static int *flagRunupPOI;
static int NtPOI;
static int *timePOI;
static float **sshPOI;


int ewLoadPOIs()
{
  FILE *fp,*fpFit,*fpAcc,*fpRej;
  int ierr,line;
  int i,j,i0,j0,imin,imax,jmin,jmax,flag,it,n;
  int rad,nmin,itype;
  char record[256],buf[256],id[64];
  double lon,lat,d2,d2min,lenLon,lenLat,depth;
  double POIdistMax,POIdepthMin,POIdepthMax;

  CNode& Node = *gNode;

  // if POIs file is not specified
  if( Par.filePOIs == NULL ) return 0;

  Log.print("Loading POIs from %s", Par.filePOIs );

  MaxPOIs = utlGetNumberOfRecords( Par.filePOIs ); if( !MaxPOIs ) return Err.post( "Empty POIs file" );

  idPOI = new char*[MaxPOIs]; if( !idPOI ) return Err.post( Err.msgAllocateMem() );
  idxPOI = new long[MaxPOIs]; if( !idxPOI ) return Err.post( Err.msgAllocateMem() );
  flagRunupPOI = new int[MaxPOIs]; if( !flagRunupPOI ) return Err.post( Err.msgAllocateMem() );
  sshPOI = new float*[MaxPOIs]; if( !sshPOI ) return Err.post( Err.msgAllocateMem() );

  // read first record and get idea about the input type
  fp = fopen( Par.filePOIs, "rt" );
  line = 0; utlReadNextRecord( fp, record, &line );
  itype = sscanf( record, "%s %s %s", buf, buf, buf );
  fclose( fp );

  if( itype == 2 ) { // poi-name and grid-index

    fp = fopen( Par.filePOIs, "rt" );
    line = NPOIs = 0;
    while( utlReadNextRecord( fp, record, &line ) != EOF ) {

      i = sscanf( record, "%s %d", id, &nmin );
      if( i != 2 ) {
        Log.print( "! Bad POI record: %s", record );
        continue;
      }
      idPOI[NPOIs] = strdup(id);
      idxPOI[NPOIs] = nmin;
      flagRunupPOI[NPOIs] = 1;
      NPOIs++;
    }

    fclose( fp );
    Log.print( "%d POIs of %d loaded successfully; %d POIs rejected", NPOIs, MaxPOIs, (MaxPOIs-NPOIs) );
  }
  else if( itype == 3 ) { // poi-name and coordinates

    if( Par.poiReport ) {
      fpAcc = fopen( "poi_accepted.lst", "wt" );
      fprintf( fpAcc, "ID lon lat   lonIJ latIJ depthIJ   dist[km]\n" );
      fpRej = fopen( "poi_rejected.lst", "wt" );
    }

    lenLat = My_PI*Re/180;

    fp = fopen( Par.filePOIs, "rt" );
    line = NPOIs = 0;
    while( utlReadNextRecord( fp, record, &line ) != EOF ) {

      i = sscanf( record, "%s %lf %lf %d", id, &lon, &lat, &flag );
      if( i == 3 )
        flag = 1;
      else if( i == 4 )
        ;
      else {
        Log.print( "! Bad POI record: %s", record );
        if( Par.poiReport ) fprintf( fpRej, "%s\n", record );
        continue;
      }

      // find the closest water grid node. Local distances could be treated as cartesian (2 min cell distortion at 60 degrees is only about 2 meters or 0.2%)
      i0 = (int)((lon - LonMin)/DLon) + 1;
      j0 = (int)((lat - LatMin)/DLat) + 1;
      if( i0<1 || i0>NLon || j0<1 || j0>NLat ) {
        Log.print( "!POI out of grid: %s", record );
        if( Par.poiReport ) fprintf( fpRej, "%s\n", record );
        continue;
      }
      lenLon = lenLat * R6[j0];

      for( nmin=-1,rad=0; rad<NLon && rad<NLat; rad++ ) {

        d2min = RealMax;

        imin = i0-rad; if( imin < 1 ) imin = 1;
        imax = i0+rad+1; if( imax > NLon ) imax = NLon;
        jmin = j0-rad; if( jmin < 1 ) jmin = 1;
        jmax = j0+rad+1; if( jmax > NLat ) jmax = NLat;
        for( i=imin; i<=imax; i++ )
          for( j=jmin; j<=jmax; j++ ) {
            if( i != imin && i != imax && j != jmin && j != jmax ) continue;
            n = idx(j,i);
            depth = Node(n, iD);
            if( depth < Par.poiDepthMin || depth > Par.poiDepthMax ) continue;
            d2 = pow( lenLon*(lon-getLon(i)), 2. ) + pow( lenLat*(lat-getLat(j)), 2. );
            if( d2 < d2min ) { d2min = d2; nmin = n; }
          }

        if( nmin > 0 ) break;
      }

      if( sqrt(d2min) > Par.poiDistMax ) {
        Log.print( "! Closest water node too far: %s", record );
        if( Par.poiReport ) fprintf( fpRej, "%s\n", record );
        continue;
      }

      idPOI[NPOIs] = strdup(id);
      idxPOI[NPOIs] = nmin;
      flagRunupPOI[NPOIs] = flag;
      NPOIs++;
      i = nmin/NLat + 1;
      j = nmin - (i-1)*NLat + 1;
      if( Par.poiReport ) fprintf( fpAcc, "%s %.4f %.4f   %.4f %.4f %.1f   %.3f\n", id, lon, lat, getLon(i), getLat(j), Node(nmin, iD), sqrt(d2min)/1000 );
    }

    fclose( fp );
    Log.print( "%d POIs of %d loaded successfully; %d POIs rejected", NPOIs, MaxPOIs, (MaxPOIs-NPOIs) );
    if( Par.poiReport ) {
      fclose( fpAcc );
      fclose( fpRej );
    }
  }

  // if mareograms
  if( Par.poiDt ) {
    NtPOI = Par.timeMax/Par.poiDt + 1;

    timePOI = new int[NtPOI];
    for( it=0; it<NtPOI; it++ ) timePOI[it] = -1;

    for( n=0; n<NPOIs; n++ ) {
      sshPOI[n] = new float[NtPOI];
      for( it=0; it<NtPOI; it++ ) sshPOI[n][it] = 0.;
    }
  }

  return 0;
}


int ewSavePOIs()
{
  int it,n;
  double ampFactor;

  CNode& Node = *gNode;

  if( !NPOIs ) return 0;

  it = Par.time / Par.poiDt;

  timePOI[it] = Par.time;

  for( n=0; n<NPOIs; n++ ) {

    if( flagRunupPOI[n] )
      ampFactor = pow( Node(idxPOI[n], iD), 0.25 );
    else
      ampFactor = 1.;

    sshPOI[n][it] = ampFactor * Node(idxPOI[n], iH);
  }

  return 0;
}


int ewDumpPOIs()
{
  FILE *fp;
  char buf[64];
  int n,it;
  double ampFactor,dbuf;

  CNode& Node = *gNode;

  if( !NPOIs ) return 0;

  if( Par.poiDt ) {  // Time series
    sprintf( buf, "%s.poi.ssh", Par.modelName );
    fp = fopen( buf, "wt" );

    fprintf( fp, "Minute" );
    for( n=0; n<NPOIs; n++ )
      fprintf( fp, "   %s", idPOI[n] );
    fprintf( fp, "\n" );

    for( it=0; (timePOI[it] != -1 && it < NtPOI); it++ ) {
      fprintf( fp, "%6.2f", (double)timePOI[it]/60 );
      for( n=0; n<NPOIs; n++ )
        fprintf( fp, " %7.3f", sshPOI[n][it] );
      fprintf( fp, "\n" );
    }

    fclose( fp );
  }

  // EAT EWH
  sprintf( buf, "%s.poi.summary", Par.modelName );
  fp = fopen( buf, "wt" );

  fprintf( fp, "ID ETA EWH\n" );

  for( n=0; n<NPOIs; n++ ) {
    fprintf( fp, "%s", idPOI[n] );
    dbuf = Node(idxPOI[n], iTime)/60;
    if( dbuf < 0. ) dbuf = -1.;
    fprintf( fp, " %6.2f", dbuf );

    if( flagRunupPOI[n] )
      ampFactor = pow(Node(idxPOI[n], iD), 0.25);
    else
      ampFactor = 1;

    fprintf( fp, " %6.3f\n", (ampFactor * Node(idxPOI[n], iHmax)) );
  }

  fclose( fp );

  return 0;
}