/************************************************************************
Program Name: Eclipse.cpp
Programmed by: Mark Cruz
School: Princess Anne High School
Program Language used: C++
Computer Used: Compaq Deskpro and Sony Vaio 
Purpose: To create and maintain a running parts inventory for an automobile.
Date: March 12, 2003
************************************************************************/

#include <iostream.h>
#include <iomanip.h>
#include <ctype.h>                 // Declares toupper(ch)
#include <fstream.h>
#include "apvector.h"
#include "apstring.h"

struct parts						// This defines the data type for the array
{
	int partNumber;
	int quantity;
	apstring descrip;
};


int Find (const apvector<parts> &inventory, int partNumber); //User doesn't see, makes sure partnumber exists
void Show (const apvector<parts> &inventory, int partNumber); //Displays information on current part
void Add (apvector<parts> &inventory, int partNumber, int quant, apstring description); //adds part to inventory
void Remove (apvector<parts> &inventory, int partNumber, int quantity1); //Removes part from inventory
void List (const apvector<parts> &inventory); //Displays the current inventory
int quantity1;

int main()

{
    apvector<parts> inventory(1);   // Array of items 
	apstring filename;
    char choice, answer;
    int partNumber, quant, i=0, n=0, h;
	apstring description;
	ofstream outfile;
	ifstream infile, infile1, infile2, infile3;
	infile.open ("inventory.txt");

	infile >> inventory[i].partNumber;
	while(infile)
	{
		infile>>inventory[i].quantity>>inventory[i].descrip;
		inventory.resize(inventory.length()+1);
		i++;
		infile >> inventory[i].partNumber;
		
	}
	inventory.resize(inventory.length()-1);

	infile.close();
	


cout << "\n";
cout << "*****************************************************************************\n";
cout << "                          W E L C O M E   T O\n\n";
cout << "                                  T H E\n\n";
cout << "               E C L I P S E   I N V E N T O R Y   P R O G R A M\n";
cout << "*****************************************************************************\n";

    for(;;) {  // Repeat (until break)

        // Show the menu and prompt:

        cout << "\n"  // Output a blank line
			 "Hello! Please enter the letter in parenthesis to.......\n"
			 "\t (E)xecute the command to SHOW the information for a SINGLE ITEM\n"     // '\t' is tab
			 "\t (C)redits\n"
             "\t (L)ist the current inventory\n"
             "\t (I)nitiate the procedure to ADD AN ITEM from the inventory\n"
		     "\t (P)urge a quantity of an item from your inventory\n"
             "\t (S)ave and exit the program to doing better and greater things\n"
	         "\t (E)xecute the command to SHOW the information for a SINGLE ITEM\n\n"
        	
			 "Please Enter Your Next Choice : ";



     

        cin >> choice;             // Read one char.
        cin.ignore(80, '\n');   // Skip remaining input (up to 80
                                //   chars) to the end of the line.
        choice = toupper(choice);     // Convert letter to upper case
                                //   to allow lower case input
                                //   for commands (for convenience).

       

     if (choice == 'S')
                            

		{
			cout << "Hey! Do you wanna save before exiting????\n ";
			cout <<" Please Enter: (Y) for Yes or (N) for No  \n";
		
			cin >> answer;

			answer=toupper(answer); //again we change the input to an uppercase for simplicity

			if (answer == 'Y')
			{
				outfile.open("inventory.txt");
				for (h=0; h< inventory.length(); h++)
				{
					outfile << inventory[h].partNumber << " "<< inventory[h].quantity<< " "<<inventory[h].descrip <<endl;
				}

				outfile.close();
				return 0;
			}

			else if (answer == 'N')
			{
				return 0;
			}
		}




        cout << "\n\n****************************************\n\n";




        

        switch (choice)
		{

            case 'E':           // Show the info for one part

            cout << "Part Number: ";
            cin >> partNumber;
            Show(inventory, partNumber);
            break;

			case 'C':           // Show the Credits
		cout << "\n\n";
		cout << "*****************************************************************************\n";
		cout << "*                         Eclipse Inventory Program                         *\n";
		cout << "*                               Programmed by   					    	 *\n";
		cout << "*               Mark Cruz for International Baccalaureate, 2003             *\n";
		cout << "*****************************************************************************\n";
			break;

			case 'L':           // List inventory 

            List(inventory);
            break;

			case 'I':           // Add inventory item 

            cout << "Part Number: ";
            cin >> partNumber;
			cout << "Description: " ;
			cin >> description;
			cout << "Quantity: ";
			cin >> quant;
            Add(inventory, partNumber, quant, description);
			
            break;

			case 'P':           // Remove inventory item 

            cout << "Part Number: ";
            cin >> partNumber;
			cout << "How many items do you wish to remove? " ;
			cin >> quantity1;
			Remove(inventory, partNumber, quantity1);
            break;

		

        }

        cout << "****************************************\n";
    }

    return 0;
}


int Find (const apvector<parts> &inventory, int partNumber)

// Finds the part number, partNumber, in the inventory array.
// Returns its index if found, -1 otherwise.

{
    int i, nItems;
	nItems = inventory.length();

    for (i = 0;   i < nItems;  i++)
        if (inventory[i].partNumber == partNumber)
            return i;
    return -1;
}

//****************************************************************

void Show (const apvector<parts> &inventory, int partNumber)

// Displays inventory information for the given part number.

{
    int i;
	i = Find(inventory, partNumber);
	if (i <= - 1)
		cout <<"Sorry. That part could not be found. Please try again.\n";
	else
	{
		cout << "Part Number: " << partNumber << endl;
		cout << "Quantity: " << inventory[i].quantity << endl; 
		cout << "Description: " << inventory[i].descrip << endl;
	}

}

//****************************************************************

void Add (apvector<parts> &inventory, int partNumber, int quant, apstring description)

// Adds the new inventory item with the specified part number,
//   partNumber, to the inventory list.
//   Checks whether partNumber is already in the list.

{
	int i, nItems;
	apstring tDescrip;

	i = Find(inventory, partNumber);
	if (i>=0)	
	{
	cout << "That Item is already in the inventory. The quantity will be added to existing amount. \n";
	
			inventory[i].quantity=inventory[i].quantity+quant;

		cout << "Your new item total is: "<< inventory[i].quantity <<  ". " << endl;
		cout << endl;
	}
	else
	{
		nItems = inventory.length();
	inventory.resize(nItems+1);

	inventory[nItems].partNumber = partNumber;
	inventory[nItems].quantity = quant;
	inventory[nItems].descrip = description;
	cout << "Your Item(s) have been added to the inventory!\n";
    }
}


//****************************************************************

void Remove (apvector<parts> &inventory, int partNumber, int quantity1)

{
    int i =Find(inventory, partNumber);

    if (i < 0)
        cout << "Sorry! Part not found!!\n";

    else if (inventory[i].quantity<quantity1)
	{
		cout<< "Sorry, you don't have that many items in stock!\n";
		cout<< "Please order more!!\n";
		
	}
	else 
	{	
		inventory[i].quantity=inventory[i].quantity-quantity1;		
        cout << quantity1<< " item(s) removed from the inventory.\n";
    }
}

//****************************************************************

void List (const apvector<parts> &inventory)

// Displays the inventory list.

{
   int i;
   cout << "Items in the inventory: "<<endl;
   cout << "Part Number" << setw(10) << "Quantity" << setw(17) << "Description" << endl;

   for (i=0; i < inventory.length(); i++)
   {
	   cout << setw(5) << inventory[i].partNumber << setw(13) << inventory[i].quantity << setw(17) << inventory[i].descrip << endl;
   }
   if (i==0) // if there is nothing in the list
	   cout << "Sorry! No parts were found.";
   cout << endl;
}