/*ExampleFSMcode*/
/*Reasdsstringfromkeyboard*/
/*
RunsFSMoneachcharacterofthe
string(callingfunctionPro)
until#characterisfound
*/
// ostream constructor
#include <iostream>
#include <fstream>
#include<iostream>
#include<string>
#include <vector>

using namespace std;
string state;
vector<string> vectors;
vector<int> lineSize;
string Token = "";
int lines = 0;
int length = 0;
int lengthCount = 0;
int line = 0;
int skip = 0;
int longness = 0;
string filename = "test.txt";
bool stop = false;

//currentFSMstate
/*DescribesanFSMwithfourstates:s0,s1,s2ands3*/
/*s3isanacceptingstate*/
/*returns1ifFSMisinacceptingstate*/
void printskeletoncode(){//prints top and main for function, they stay constant
	  std::filebuf fb;
  fb.open ("Generated_FSM.cpp",std::ios::app);
  std::ostream os(&fb);
  os <<"int main(){\n";
  os <<" string input;\n";
  os <<"int string_accepted = 0;\n";
  os <<"state = \"s0\"; //starting state\n";
  os <<"while ( 1 ){ \n";
  os <<"if( string_accepted == 1){break;}\n";
  os <<"cout<<\"enter input string:\";\n";
  os <<"cin>>input;\n";
  os <<"cout<<input<<endl;\n";
  os <<"string_accepted = Proc(input);\n";
  os <<" cout<<\"Input is \"<<input<<\" state is \"<<state<<endl;\n";
  os <<"}\n";
  os <<" cout<<\" accepted = \"<<string_accepted<<endl;\n";
  os <<"} \n";

  os <<"\n";

  fb.close();
}

char testChar(char char1, char char2){
if(char1 == ',' && char2 == ','){

	return ',';

	}

	if(char1 == ':' && char2 == ':'){

	return ':';

	}

	return ' ';

}



void ProcessChar(char in_char){//used for making inputs into tokens which can be printed into custom code

if(state == "s0"){

	if(in_char != ',' && in_char != ':' && in_char != '#' && in_char != '\n' && in_char != ' '){

		 Token +=(in_char);

		 }
	else{

		state = "s1";

		}

		lengthCount++;

}
if(lengthCount == length){state = "s1";}

 if(state == "s1"){


		if(Token != ""){

			vectors.push_back(Token);
			longness++;

			}

		Token="";state= "s0";

}
}


void readFile(string filename){
	ifstream infile;
	infile.open(filename);
	string a;

	while(getline(infile,a)){
		state="s0";
		longness = 0;

		length = (int)a.length();
		lengthCount = 0;
		for(int i = 0; i< (int)a.length(); i++){
			if(i>0){
				if(testChar(a.at(i-1),a.at(i)) != ' '){
					cout<<"Too Many "<<testChar(a.at(i),a.at(i+1))<<" Program Shutting Down"<<endl;
					throw std::exception();
				}
			}

			ProcessChar(a.at(i));

			}

			lineSize.push_back(longness);
			lines++;

		//call break string method
		}
		infile.close();
	}
void printMethod(){

  std::filebuf fb;
  fb.open ("Generated_FSM.cpp",std::ios::out);
  std::ostream os(&fb);
    os <<"/*Example FSM code*/\n";
  os <<"/*Reasds string from keyboard*/\n";
  os <<"/*\n";
  os <<"Runs FSM on each character of the \n";
  os <<"string (calling function Pro) \n";
  os <<"until # character is found\n";
  os <<"*/\n";
  os <<"#include <iostream>\n";
  os <<"#include <string>\n";
  os <<"\n";
  os <<"using namespace std;\n";
  os <<"\n";
  os <<"string state;  // current FSM state\n";
  os <<"\n";
  os <<"/*Describes an FSM with four states: s0, s1,s2 and s3 */\n";
  os <<"/* s3 is an accepting state*/\n";
  os <<"/*returns 1 if FSM is in accepting state*/\n";
  os <<"\n";
    os <<" int Proc(string input){\n";

int size = lineSize.at(line);

	  os <<"if(state==\""<<vectors.at(0)<<"\"){"<<"\n";
	  os <<"if(input=="<<'"'<<vectors.at(1)<<"\"){state=\""<<vectors.at(2)<<"\";}"<<"\n";//prints given output line, inserts tokens

	for(int i = 3; i < size; i +=2){

		os <<"else if(input=="<<'"'<<vectors.at(i)<<"\"){state=\""<<vectors.at(i+1)<<"\";}"<<"\n";//prints given output line, inserts tokens

	}

	os <<"}"<<"\n";
	line = 0;

	for(int o = 1; o < lines-1; o++){

		size = lineSize.at(o);
		skip = 0;

		for(int x = 0; x <= line; x++){

			skip += lineSize.at(x);

			}

		os <<"else if(state==\""<<vectors.at(skip)<<"\"){"<<"\n";
		os <<"if(input=="<<'"'<<vectors.at(skip+1)<<"\"){state=\""<<vectors.at(skip+2)<<"\";}"<<"\n";

		for(int y = 3; y < size; y=y+2){

			os <<"else if(input=="<<'"'<<vectors.at(skip+y)<<"\"){state=\""<<vectors.at(skip+y+1)<<"\";}"<<"\n";//prints given output line, inserts tokens
		}

		os <<"}"<<"\n";
		line++;
}

skip = 0;

for(int x = 0; x<=line; x++){
		skip += lineSize.at(x);

}

os <<"if(state==\""<<vectors.at(skip)<<"\"){"<<"\n";
	os<<"cout<<\"Accepted\"<<endl; \n";
	os<<"return 1;";
	os <<"}"<<"\n";
	os<<"return 0; \n";
	os <<"}"<<"\n";
	fb.close();//close file
	}


int main(){
	readFile(filename);
	printMethod();
	printskeletoncode();
}