#include "Datafile.h"
#include "Bucketfile.h"
#include "Directoryfile.h"
#include "Hash.h"
#include "Directory.h"
#include "Bucket.h"



#include <fstream>
#include <iostream>
#include <string>
#include <iomanip>     // for setw, setiosflags, etc...
using namespace std;

const int number_length = 8;
const int lastname_length = 10;
const int firstname_length = 10;
const int credits_length = 3;
const int CGPA_length = 4;

int i=0;
int key=-1;
int depth=-1;

// set the record size, which is the sum of the lengths
// of the student number field, the name field, and 
// extra end-of-line characters 
const int recsize = number_length + lastname_length + firstname_length + credits_length + CGPA_length + 2;


// read a student from a istream 
void readDatafile(int, istream&, Datafile&);
// write a student in the ostream
void writeDatafile(ostream&, Datafile);


// main method
int main(int argc, char* argv[])
{
	//check if the use of command line arguments are correct	
  if ((argc == 5)&&(strcmp(argv[2], "EHdirectory.txt")==0)&&(strcmp(argv[3], "EHbuckets.txt")==0)&&(strcmp(argv[4], "log.txt")==0)) 
  { 
  Datafile datafile;				  // a student

  fstream input;                      // input stream
  fstream output_directory;           // output stream
  fstream output_bucket;              // output stream

  fstream output_log;                 // output stream


  char inputname[40];                 // input filename
  char directory_fileName[40];        // output filename
  char bucket_fileName[40];           // output filename

  char log_file[40];                  // output log.txt


  strcpy(inputname,argv[1]);

  strcpy(directory_fileName, argv[2]);

  strcpy(bucket_fileName,argv[3]);
  strcpy(log_file,argv[4]);



  
   
	// open the input file
	input.open(inputname, ios::in);

	// Check to make sure that we could open the files properly!
    if (input.fail()) {
    cerr << "Could not open file ";
    cerr << inputname;
    cerr << ".\n";
    return 1;
  }

    int result;
	Directory Dir(5);
	result = Dir.Create(directory_fileName,bucket_fileName,log_file);
	if(result ==0)
	{
	  cout<<"Please delete EHdirectory.txt and EHbucket.txt and log.txt"<<endl;
	  return 0;
	}

 // show the input file name
	cout << "input file name:" << inputname << endl;
	cout << "output file name:" << directory_fileName << " " << bucket_fileName<< " " << log_file << endl;

    // open the files
	result = Dir.Open(directory_fileName,bucket_fileName,log_file);

	

  // read students from input and
  // write them in the output
  while(!input.eof()) {
    readDatafile(i,input,datafile);
    key = datafile.getNumber();
	result = Dir.Insert(datafile.getNumber(),i);

	i++;
  }	
  


  cout << endl << "Program completed successfully !!" << endl;
  cout << "Check output file out." << endl << endl;

  
  input.close();
  Dir.Close();
  return 0;

  }
  
  else 

  if ((argc == 3)&&(strcmp(argv[2], "EHdirectory.txt")==0)) 
  { 
  Datafile datafile;				  // a student

  fstream input;                      // input stream
  fstream input_directory;            // input stream
  fstream input_bucket;              // output stream

  fstream output_log;                 // output stream


  char inputname[40];                 // input filename
  char directory_fileName[40];        // output filename
  char bucket_fileName[40];           // output filename
  long int studentNum=0;
  int address=-1;
  int recAddress=-1;

  char log_file[40];                  // output log.txt

  strcpy(inputname,argv[1]);

  strcpy(directory_fileName, argv[2]);

  strcpy(bucket_fileName,"EHbuckets.txt");
  strcpy(log_file,"log.txt");

    while(studentNum!=-1) {


    // show the input 
	cout << "input student number please:"<<endl;
    cin  >> studentNum;
    if (studentNum==-1)
	{
	return 0;
	break;
	}
   
	// open the input file
	input.open(inputname, ios::in);

	// Check to make sure that we could open the files properly!
    if (input.fail()) {
    cerr << "Could not open file ";
    cerr << inputname;
    cerr << ".\n";
    return 1;
  }

    // open the files

	Directoryfile directoryfile;
    input_directory.open(directory_fileName, ios::in);
   // Check to make sure that we could open the files properly!
    if (input_directory.fail()) {
    cerr << "Could not open file ";
    cerr << directory_fileName;
    cerr << ".\n";
    return 1;
    }
    directoryfile.readDirectoryfile(0,input_directory);
    depth=directoryfile.getKey();
	address=hash(studentNum, depth);
    directoryfile.readDirectoryfile(address+1,input_directory);
	recAddress=directoryfile.getKey();

    Bucketfile theBucket;
	input_bucket.open(bucket_fileName, ios::in);
	// Check to make sure that we could open the files properly!
    if (input_bucket.fail()) {
    cerr << "Could not open file ";
    cerr << bucket_fileName;
    cerr << ".\n";
    return 1;
    }
    theBucket.readBucketfile(recAddress,input_bucket);
	if (studentNum==0)
	{	
        cout<<"No such record in Index,please check it out"<<endl;
	}
    else if (studentNum==theBucket.getKeys0())
	{	cout<<"the student number is:"<<theBucket.getKeys0()<<endl;
        cout<<"Its RRN is:"<<theBucket.getRecAddr0()<<endl;
		readDatafile(theBucket.getRecAddr0(),input,datafile);
	    cout<<"The Name of the student is: "<<datafile.getLastName()<<" "<<datafile.getFirstName()<<endl;
	    cout<<"The Total credits finished by the student is:"<<datafile.getCredits()<<endl;
		cout<<"The CGPA of the student is: "<<datafile.getCGPA()<<endl;

	}
	else if (studentNum==theBucket.getKeys1())
	{	cout<<"the student number is:"<<theBucket.getKeys1()<<endl;
        cout<<"Its RRN is:"<<theBucket.getRecAddr1()<<endl;
		readDatafile(theBucket.getRecAddr1(),input,datafile);
	    cout<<"The Name of the student is: "<<datafile.getLastName()<<" "<<datafile.getFirstName()<<endl;
	    cout<<"The Total credits finished by the student is:"<<datafile.getCredits()<<endl;
		cout<<"The CGPA of the student is: "<<datafile.getCGPA()<<endl;
	}
	else if (studentNum==theBucket.getKeys2())
	{	cout<<"the student number is:"<<theBucket.getKeys2()<<endl;
        cout<<"Its RRN is:"<<theBucket.getRecAddr2()<<endl;
		readDatafile(theBucket.getRecAddr2(),input,datafile);
	    cout<<"The Name of the student is: "<<datafile.getLastName()<<" "<<datafile.getFirstName()<<endl;
	    cout<<"The Total credits finished by the student is:"<<datafile.getCredits()<<endl;
		cout<<"The CGPA of the student is: "<<datafile.getCGPA()<<endl;
	}
	else if (studentNum==theBucket.getKeys3())
	{	cout<<"the student number is:"<<theBucket.getKeys3()<<endl;
        cout<<"Its RRN is:"<<theBucket.getRecAddr3()<<endl;
		readDatafile(theBucket.getRecAddr3(),input,datafile);
	    cout<<"The Name of the student is: "<<datafile.getLastName()<<" "<<datafile.getFirstName()<<endl;
	    cout<<"The Total credits finished by the student is:"<<datafile.getCredits()<<endl;
		cout<<"The CGPA of the student is: "<<datafile.getCGPA()<<endl;
	}
	else if (studentNum==theBucket.getKeys4())
	{	cout<<"the student number is:"<<theBucket.getKeys4()<<endl;
        cout<<"Its RRN is:"<<theBucket.getRecAddr4()<<endl;
		readDatafile(theBucket.getRecAddr4(),input,datafile);
	    cout<<"The Name of the student is: "<<datafile.getLastName()<<" "<<datafile.getFirstName()<<endl;
	    cout<<"The Total credits finished by the student is:"<<datafile.getCredits()<<endl;
		cout<<"The CGPA of the student is: "<<datafile.getCGPA()<<endl;
	}
	else
	{	
        cout<<"No such record in Index,please check it out"<<endl;
	}
    input_directory.close();
    input_bucket.close();
    input.close();
  
	}

  }

  else
  
  {
   // show the message of correct use of command line
	cout << "\n Usage For create: " << argv[0] << " <student_filename>"<< " <EHdirectory.txt>"<<" <EHbuckets.txt>" <<" <log.txt>\n";
	cout << "\n Usage For search: " << argv[0] << " <student_filename>"<< " <EHdirectory.txt>\n";

	return 1;
  }

}

 //read a student from a istream 
void readDatafile(int rrn, istream& input, Datafile& s)
{
  string number_str;
  string lastname_str;
  string firstname_str;
  string credits_str;
  string CGPA_str;


  long int number;
  int credits;
  int credits_term=0;

  float CGPA;
 

  string line;

  // seek to the appropriate student
  s.InputPositioningByRRN(rrn, input);

  // read in a line from fine
  getline(input,line,'\n');

  // get the number and last name and first name and credits and CGPA strings
  number_str = line.substr(0,number_length);
  lastname_str = line.substr(number_length,number_length);
  firstname_str = line.substr(number_length+lastname_length,lastname_length);
  credits_str = line.substr(number_length+lastname_length+firstname_length,credits_length);
  CGPA_str = line.substr(number_length+lastname_length+firstname_length+credits_length,CGPA_length);

  // convert the number string into a long int.
  number = atol((number_str.c_str()));

  // convert the credits string into a int.
  credits = atoi((credits_str.c_str()));

  // convert the CGPA string into a float
  CGPA = (float)atof((CGPA_str.c_str()));

  // set number and lastname and firstname and credits and CGPA for student s
  s.setNumber(number);
  s.setLastName(lastname_str);
  s.setFirstName(firstname_str);
  s.setCredits(credits);
  s.setCredits_term(credits_term);
  s.setCGPA(CGPA);


}