/*
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_expand.h"

#include <stdio.h>
#include <stdlib.h>
#include "cli_parser.h"
#include "parse_file.h"
#include "polynomial.h"
#include "array.h"
#include "fields.h"


#define CP_FLAG_NAMESPACE 1
// read command line arguments
int tool_expand_read_args(int argc, const char* argv[], Str_Array* str_args, Meantools_Options* opts){
  // 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
  // no namespace
  (*opts).namespace.length=-1;


  // 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){
	// number of derivatives
	case 'N':
	  flag=CP_FLAG_NAMESPACE;
	  break;
	}
      }
    }
    // namespace
    else if(flag==CP_FLAG_NAMESPACE){
      str_to_char_array((char*)argv[i], &(opts->namespace));
      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);
}


// expand a polynomial
int tool_expand(Str_Array str_args, Meantools_Options opts){
  // index of the entry in the input file
  int arg_index;
  // input polynomial
  Polynomial polynomial;
  // fields table
  Fields_Table fields;
  // preprocessor variables
  Variables variables;

  // parse fields
  if(opts.namespace.length>=0){
    arg_index=find_str_arg_ns("fields", opts.namespace, str_args);
  }
  else{
    arg_index=find_str_arg("fields", str_args);
  }
  if(arg_index<0){
    fprintf(stderr,"error: no fields entry in the configuration file\n");
    exit(-1);
  }
  else{
    parse_input_fields(str_args.strs[arg_index],&fields);
  }

  // parse variables
  // must precede id_table, virtual_fields, identities and input_polynomial
  if(opts.namespace.length>=0){
    arg_index=find_str_arg_ns("preprocessor_variables", opts.namespace, str_args);
  }
  else{
    arg_index=find_str_arg("preprocessor_variables", str_args);
  }
  if(arg_index>=0){
    parse_input_variables(str_args.strs[arg_index],&variables);
  }
  else{
    init_Variables(&variables,1);
  }

  // parse virtual_fields
  if(opts.namespace.length>=0){
    arg_index=find_str_arg_ns("virtual_fields", opts.namespace, str_args);
  }
  else{
    arg_index=find_str_arg("virtual_fields", str_args);
  }
  if(arg_index>=0){
    parse_input_virtual_fields(str_args.strs[arg_index], &fields, variables);
  }

  // parse identities
  if(opts.namespace.length>=0){
    arg_index=find_str_arg_ns("identities", opts.namespace, str_args);
  }
  else{
    arg_index=find_str_arg("identities", str_args);
  }
  if(arg_index>=0){
    parse_input_identities(str_args.strs[arg_index],&fields, variables);
  }

  // parse input polynomial
  if(opts.namespace.length>=0){
    arg_index=find_str_arg_ns("input_polynomial", opts.namespace, str_args);
  }
  else{
    arg_index=find_str_arg("input_polynomial", str_args);
  }
  if(arg_index>=0){
    parse_input_polynomial(str_args.strs[arg_index], &polynomial, fields, variables);
  }
  else{
    fprintf(stderr,"error: no input polynomial entry in the configuration file\n");
    exit(-1);
  }

  // print polynomial
  polynomial_print(polynomial);

  // free memory
  free_Variables(variables);
  free_Fields_Table(fields);
  free_Polynomial(polynomial);

  if(opts.namespace.length>=0){
    free_Char_Array(opts.namespace);
  }
  return(0);
}