/*
Copyright 2015-2022 Ian Jauslin

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

#include "meantools_eval.h"

#include <stdio.h>
#include <stdlib.h>
#include <mpfr.h>
#include "parse_file.h"
#include "cli_parser.h"
#include "grouped_polynomial.h"
#include "array.h"
#include "rcc.h"
#include "rcc_mpfr.h"


#define CP_FLAG_RCCS 1
#define CP_FLAG_MPFR_PREC 2
#define CP_FLAG_MPFR_EXP 3
// read command line arguments
int tool_eval_read_args(int argc, const char* argv[], Str_Array* str_args, Meantools_Options* opts){
  // temporary long int
  long int tmp_lint;
  // file to read the polynomial from in flow mode
  const char* file="";
  // whether a file was specified on the command-line
  int exists_file=0;
  // flag
  int flag=0;
  int i;
  char* ptr;

  // defaults
  // mark rccstring so that it can be recognized whether it has been set or not
  (*opts).eval_rccstring.length=-1;
  // no mpfr
  (*opts).mpfr_prec=0;
  (*opts).mpfr_emax=0;

  // loop over arguments
  for(i=2;i<argc;i++){
    // flag
    if(argv[i][0]=='-'){
      for(ptr=((char*)argv[i])+1;*ptr!='\0';ptr++){
	switch(*ptr){
	// evaluate string
	case 'R':
	  flag=CP_FLAG_RCCS;
	  break;
	// mpfr precision
	case 'P':
	  flag=CP_FLAG_MPFR_PREC;
	  break;
	// mpfr emax
	case 'E':
	  flag=CP_FLAG_MPFR_EXP;
	  break;
	}
      }
    }
    // rccs
    else if(flag==CP_FLAG_RCCS){
      str_to_char_array((char*)argv[i], &((*opts).eval_rccstring));
      flag=0;
    }
    // mpfr precision
    else if(flag==CP_FLAG_MPFR_PREC){
      sscanf(argv[i],"%ld",&tmp_lint);
      (*opts).mpfr_prec=(mpfr_prec_t)tmp_lint;
      flag=0;
    }
    // mpfr emax
    else if(flag==CP_FLAG_MPFR_EXP){
      sscanf(argv[i],"%ld",&tmp_lint);
      (*opts).mpfr_emax=(mpfr_exp_t)tmp_lint;
      flag=0;
    }
    // read file name from command-line
    else{
      file=argv[i];
      exists_file=1;
    }
  }

  read_config_file(str_args, file, 1-exists_file);

  return(0);
}


// evaluate a flow equation on a vector of rccs
int tool_eval(Str_Array str_args, Meantools_Options opts){
  // index of the entry in the input file
  int arg_index;
  // rccs
  RCC rccs;
  RCC_mpfr rccs_mpfr;
  // flow equation
  Grouped_Polynomial flow_equation;
  // whether or not to use mpfr floats
  int mpfr_flag=0;

  // set mpfr defaults
  if(opts.mpfr_prec!=0){
    mpfr_set_default_prec(opts.mpfr_prec);
    mpfr_flag=1;
  }
  if(opts.mpfr_emax!=0){
    mpfr_set_emax(opts.mpfr_emax);
    mpfr_flag=1;
  }

  // parse flow equation
  // if there is a unique argument, assume it is the flow equation
  if(str_args.length==1){
    char_array_to_Grouped_Polynomial(str_args.strs[0], &flow_equation);
  }
  else{
    arg_index=find_str_arg("flow_equation", str_args);
    if(arg_index<0){
      fprintf(stderr,"error: no flow equation entry in the configuration file\n");
      exit(-1);
    }
    else{
      char_array_to_Grouped_Polynomial(str_args.strs[arg_index], &flow_equation);
    }

    // rccs
    // check they were not specified on the command line
    if(opts.eval_rccstring.length==-1){
      arg_index=find_str_arg("initial_condition", str_args);
      if(arg_index>=0){
	char_array_cpy(str_args.strs[arg_index],&(opts.eval_rccstring));
      }
    }
  }

  // initialize the rccs
  if(mpfr_flag==0){
    prepare_init(flow_equation.indices,flow_equation.length,&rccs);
  }
  else{
    prepare_init_mpfr(flow_equation.indices,flow_equation.length,&rccs_mpfr);
  }
  // read rccs from string
  if(opts.eval_rccstring.length!=-1){
    parse_init_cd(opts.eval_rccstring, &rccs, &rccs_mpfr, mpfr_flag);
    free_Char_Array(opts.eval_rccstring);
  }

  // evaluate
  if(mpfr_flag==0){
    evaleq(rccs, rccs, flow_equation);
    RCC_print(rccs);
    free_RCC(rccs);
  }
  else{
    evaleq_mpfr(rccs_mpfr, rccs_mpfr, flow_equation);
    RCC_mpfr_print(rccs_mpfr);
    free_RCC_mpfr(rccs_mpfr);
  }


  // free memory
  free_Grouped_Polynomial(flow_equation);
  return(0);
}