// MOTORS_02 Application

/*
 Electric Motor Inventory example, using a text file by Kip Irvine.
 
 Required background: Two lectures on classes and objects, including
 file streams, constructors.
            
 See the MotorsApp PowerPoint slide show for a list of the following 
 scenarios:

Scenario 1: Manager appends a new motor to the motor inventory file
Scenario 2: The manager views a list of all motors in the 
            motor inventory file
Scenario 3: The manager searches for a motor in the motor
            inventory file using the motor's ID number
Scenario 4: The manager adds a new motor to the inventory file if 
            and only if the motor is not already in the file
Scenario 5: The manager views a list of all motors having a 
            specific voltage. 
*/

#include <iostream>
#include <fstream>        
#include <string>
#include <cmath>   
//#include <curses.h>   
//#include <conio.h>
using namespace std;

#include "motor.h"

const string MOTOR_FILENAME = "motors.txt";

void wait()
{
  cout << "Press any key...";
  getchar();
  cout << endl;
}

//************* PROPOSED UTILITY FUNCTIONS **************

double InputReal()
// Purpose: Input a real number, with error checking
//          for corrupted input
// Returns: A valid double value
{

  return 0;
}

bool OpenInputInventoryFile( ifstream & infile )
// Purpose: Open the Inventory file for input. 
// Receives: infile - the file stream to be opened
// Returns: true if the file was successfully opened, 
//          false otherwise
{

  return true;
} 

bool OpenOutputInventoryFile( ofstream & outfile )
// Purpose: Open the Inventory file for output. 
// Receives: outfile - the file stream to be opened
// Returns: true if the file was successfully opened, 
//          false otherwise
{

  return true;
}

bool AppendMotor( CMotor & aMotor )
// Purpose: Append a motor to the Inventory file
// Returns: true if the operation was successfull, or
//          false if it was not.
{
  

  return true;
}

bool FindMotor( CMotor & aMotor )
// Purpose: Searches for a motor in the inventory file by looking
// for a matching ID number. If one is found, a complete 
// motor object is returned in aMotor.
// Receives: aMotor - a motor containing only an ID number     
// Returns: true if findID matches one of the motor
//          ID numbers in the file; false otherwise
{

  // to be done later


  return false;
}

//********* END OF UTILITY FUNCTIONS *************


void Scenario1()
// Manager appends a new motor to the motor inventory file
{
  cout << "Appending a new motor to the inventory file.\n\n";
  cout << "Enter all motor attributes:\n";

  CMotor M1;
  M1.Input();
  
  ofstream outfile(MOTOR_FILENAME.c_str(), ios::app);
  if( !outfile.is_open())
  {
    cout << "Cannot open " << MOTOR_FILENAME 
         << " in output mode.\n";
    return;
  }

  M1.WriteToFile(outfile);  
}

void Scenario2()
// The manager views a list of all motors in the 
// motor inventory file
{
  ifstream infile(MOTOR_FILENAME.c_str());
  if( !infile.is_open()) 
  {
    cout << "Cannot open " << MOTOR_FILENAME << endl;
    return;
  } 

  system("cls");
  cout << "**** Complete Motor Inventory ****\n\n";
  int lineCount = 0;
  CMotor aMotor;

  while( !infile.eof() )
  {
    aMotor.ReadFromFile(infile);

    // check for blank ID number at end of file:
    if( aMotor.get_ID() != "" )
      aMotor.Display();
  
    lineCount++;
    if( lineCount % 22 == 0 )     // pause every 22 lines
      wait();
  }
}


void Scenario3()
// The manager searches for a motor in the motor
// inventory file using the motor's ID number
{
  ifstream infile(MOTOR_FILENAME.c_str());
  if( !infile.is_open()) 
  {
    cout << "Cannot open " << MOTOR_FILENAME << endl;
    return;
  } 

  system("cls");
  cout << "**** Searching for a Motor ****\n\n";
  
  string findID;
  cout << "Enter the ID number to be found: ";
  cin >> findID;

  CMotor aMotor;
  bool foundMatchingID = false;

  while( !(infile.eof() || foundMatchingID) )
  {
    aMotor.ReadFromFile(infile);

    if( aMotor.get_ID() == findID )
    {
      cout << "A matching motor was found:\n";
      aMotor.Display();
      foundMatchingID = true;
    }
  }  // while

  if( !foundMatchingID )
    cout << "Unable to find a matching motor.\n\n";
}


void Scenario4()
// The manager adds a new motor to the inventory file if 
// and only if the motor is not already in the file
{
  ifstream infile(MOTOR_FILENAME.c_str());
  if( !infile.is_open()) 
  {
    cout << "Cannot open " << MOTOR_FILENAME << endl;
    return;
  } 

  system("cls");
  cout << "**** Adding a New Motor to the Inventory "
          "File ****\n\n";

  CMotor newMotor;
  cout << "Enter all motor attributes:\n";
  newMotor.Input();

  while( !infile.eof() )
  {
    CMotor aMotor;
    aMotor.ReadFromFile(infile);
    if( aMotor.get_ID() == newMotor.get_ID() )
    {
      cout << "The motor ID is already in the file, and "
              "cannot be added.\n";
      return;
    }
  }  // while
  infile.close();  

  // If we arrive here, the motor was not found. We can 
  // append the new motor.

  ofstream outfile(MOTOR_FILENAME.c_str(), ios::app);
  if( !outfile.is_open())
  {
    cout << "Cannot open " << MOTOR_FILENAME 
         << " in output mode.\n";
    return;
  }

  newMotor.WriteToFile(outfile);  
  cout << "The new motor was successfully appended "
          "to the inventory file.\n";
}


void Scenario5()
// The manager views a list of all motors having a 
// specific voltage. 
{
  ifstream infile(MOTOR_FILENAME.c_str());
  if( !infile.is_open()) 
  {
    cout << "Cannot open " << MOTOR_FILENAME << endl;
    return;
  } 

  system("cls");
  cout << "**** Motor Inventory (selective) ****\n\n";

  cout << "Enter two values separated by a space: \n"
    "(1) A motor voltage that will be used to \n"
    "    select motors for display from the Inventory file,\n"
    "(2) A tolerance value (in volts) for accuracy of comparison\n\n"
    "> ";

  double voltage, tolerance;
  while(true)
  {
    cin >> voltage >> tolerance;
    if( cin.fail())
    {
      //      cin.clear();
      cin.ignore(255,'\n');
      cout << "Bad input--try again: ";
    }
    else
      break;
  }


  // Begin searching for motors that match the target
  // voltage.
  
  int lineCount = 0;
  CMotor aMotor;

  while( !infile.eof() )
  {
    aMotor.ReadFromFile(infile);

    // Find the absolute value of the difference between
    // the current motor's voltage and the target voltage.
    // If the difference is within the user-specified limit,
    // assume that we have a matching motor.
    if( fabs(aMotor.get_Voltage() - voltage) <= tolerance )
      aMotor.Display();
  
    lineCount++;
    if( lineCount % 22 == 0 )     // pause every 22 lines
      wait();
  }
}

int menu()
{
  system("cls");
  cout << "***** Motor Inventory: Main Menu *****\n\n"
       << "Select a Scenario:\n\n"
  "1: Manager appends a new motor to the motor inventory file\n"
  "2: The manager views a list of all motors in the\n"
  "   motor inventory file\n"
  "3: The manager searches for a motor in the motor\n"
  "   inventory file using the motor's ID number\n"
  "4: The manager adds a new motor to the inventory file if\n"
  "   and only if the motor is not already in the file\n"
  "5: The manager views a list of all motors having a\n"
  "   specific voltage.\n"
  "9: Quit program\n\n"
  "> ";

  int choice;
  while(true)
  {
    cin >> choice;
    if( cin.fail())
    {
      //      cin.clear();
      cin.ignore(255,'\n');
      cout << "Bad input--try again: ";
    }
    else
      break;
  }
  return choice;
}

int main(void)
{
  while(true)
  {
    int choice = menu();
    switch( choice )
    {
      case 1: Scenario1();
        break;
      case 2: Scenario2();
        break;
      case 3: Scenario3();
        break;
      case 4: Scenario4();
        break;
      case 5: Scenario5();
        break;
      case 9:
        return 0;
    }
    wait();
  }
}