/*
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.
*/

/*
numkondo

Compute the flow of a flow equation numerically

*/


#include <stdio.h>
#include <stdlib.h>

// pre-compiler definitions
#include "definitions.cpp"

// rccs
#include "rcc.h"
#include "rcc_mpfr.h"
// grouped representation of polynomials
#include "grouped_polynomial.h"
// command line parser
#include "cli_parser.h"
// parse input file
#include "parse_file.h"
// numerical flow
#include "flow.h"
#include "flow_mpfr.h"
// arrays
#include "array.h"

// read cli arguments
int read_args_numkondo(int argc,const char* argv[], Str_Array* str_args, Numkondo_Options* opts);
// print usage message
int print_usage_numkondo();
// compute flow
int numflow(Str_Array str_args, Numkondo_Options opts);


int main (int argc, const char* argv[]){
  // string arguments
  Str_Array str_args;
  // options
  Numkondo_Options opts;

  // read command-line arguments
  read_args_numkondo(argc,argv,&str_args,&opts);

  numflow(str_args, opts);

  //free memory
  free_Str_Array(str_args);
  return(0);
}


// parse command-line arguments
#define CP_FLAG_NITER 1
#define CP_FLAG_RCCS 2
#define CP_FLAG_MPFR_PREC 3
#define CP_FLAG_MPFR_EXP 4
int read_args_numkondo(int argc,const char* argv[], Str_Array* str_args, Numkondo_Options* opts){
  int i;
  // temporary long int
  long int tmp_lint;
  // pointers
  char* ptr;
  // file to read the polynomial from in flow mode
  const char* file="";
  // flag that indicates what argument is being read
  int flag=0;
  // whether a file was specified on the command-line
  int exists_file=0;

  // defaults
  // display entire flow
  (*opts).display_mode=DISPLAY_NUMERICAL;
  // default niter
  (*opts).niter=100;
  // 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=1;i<argc;i++){
    // flag
    if(argv[i][0]=='-'){
      for(ptr=((char*)argv[i])+1;*ptr!='\0';ptr++){
	switch(*ptr){
	// final step: display the final step of the integration with maximal precision
	case 'F':
	  (*opts).display_mode=DISPLAY_FINAL;
	  break;
	// niter
	case 'N':
	  flag=CP_FLAG_NITER;
	  break;
	// initial condition
	case 'I':
	  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;
	// print version
	case 'v':
	  printf("numkondo " VERSION "\n");
	  exit(1);
	  break;
	}
      }
    }
    // if the niter flag is up
    else if (flag==CP_FLAG_NITER){
      // read niter
      sscanf(argv[i],"%d",&((*opts).niter));
      // reset flag
      flag=0;
    }
    // init condition
    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);
}

// print usage message
int print_usage_numkondo(){
  printf("\nusage:\n   numkondo [-F] [-N niter] [-I initial_condition] [-P precision] [-E exponent_range] <filename>\n\n");
  return(0);
}


// numerical computation of the flow
int numflow(Str_Array str_args, Numkondo_Options opts){
  // index of the entry in the input file
  int arg_index;
  // list of rccs
  Labels labels;
  // initial condition
  RCC init_cd;
  RCC_mpfr init_cd_mpfr;
  // flow equation
  Grouped_Polynomial flow_equation;
  // whether or not to use mpfr floats
  int mpfr_flag=0;
  // postprocess flow equation
  Grouped_Polynomial postprocess_flow_equation;

  // 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 labels
  arg_index=find_str_arg("labels", str_args);
  if(arg_index<0){
    fprintf(stderr,"error: no labels entry in the configuration file\n");
    exit(-1);
  }
  else{
    parse_labels(str_args.strs[arg_index], &labels);
  }

  // parse flow equation
  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);
  }

  // parse postprocess operation
  arg_index=find_str_arg("postprocess_operation", str_args);
  if(arg_index>=0){
    char_array_to_Grouped_Polynomial(str_args.strs[arg_index], &postprocess_flow_equation);
  }
  else{
    init_Grouped_Polynomial(&postprocess_flow_equation,1);
  }


  // initial conditions
  // 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){
      fprintf(stderr,"error: no initial condition in the configuration file or on the command line\n");
      exit(-1);
    }
    else{
      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,&init_cd);
  }
  else{
    prepare_init_mpfr(flow_equation.indices,flow_equation.length,&init_cd_mpfr);
  }

  // read rccs from string
  if(opts.eval_rccstring.length!=-1){
    parse_init_cd(opts.eval_rccstring, &init_cd, &init_cd_mpfr, mpfr_flag);
    free_Char_Array(opts.eval_rccstring);
  }

  if(mpfr_flag==0){
    numerical_flow(flow_equation, init_cd, postprocess_flow_equation, labels, opts.niter, opts.display_mode);
    free_RCC(init_cd);
  }
  else{
    numerical_flow_mpfr(flow_equation, init_cd_mpfr, postprocess_flow_equation, labels, opts.niter, opts.display_mode);
    free_RCC_mpfr(init_cd_mpfr);
  }


  // free memory
  free_Labels(labels);
  free_Grouped_Polynomial(postprocess_flow_equation);
  free_Grouped_Polynomial(flow_equation);
  return(0);
}