#include <iostream>
#include <iomanip>
#include <cmath>
#include <string>
#include <fstream>
 
using namespace std;
 
 
struct member													// This structure is made for the member
{
	string member_name;											// Each member will have a member's name
	string member_pass;											// password and
	double balance;												// balance
};																// This will make things easier for organizing the data
 
 
struct item														// This structure is made for the items
{
	int id;														// Each item will have an id
	char name[100];												// name and
	double price;												// price
};																// This will make things easier for organizing the data 
 
 
//After making the structures then we initialize the needed variables as types of the structures 
item personal_cars[20];											// Initialize personal cars	variable						
item rent_cars[10];												// Initialize rent cars variable
item cart[10];													// Initialize cart variable
member members[20];												// Initialize members variable
 
 
//Initializing these global variables to 0 is necesary each time the program is run
int position=0;													// Position is a counter that will stop at the user that logs in
int size=0;														// Size will determine the position of the item, i.e if size is at 3 then there are 3 items in cart
int counter=0;													// Counter will count the total number of members
fstream log_member;												// Initializes file for both reading and writing
 
 
//These are the user defined functions
void intro();
void start();
void login();
void new_member();
void options();
void view_account();
void view_cart();
void add_to_cart(char);
void check_out();
void drop();
void order();
void logout();
void display_items(char);
void Add_to_balance();
void receipt(double total);
void update();
 
 
 
//*********************************************************************************************************************
 
//##############################              MAIN FUNCTION          ##################################################
 
int main()
{
	intro();
    start();
    options();
 
    system("PAUSE");    
    return 0;
}
 
//##############################              END MAIN              ###################################################
 
//*********************************************************************************************************************
 
 
 
//The start function Prints out the Welcome screen and gives the user his first choices in the program
//The choices chosen are other functions thenselves
 
void intro()
{
	cout <<endl;
	cout << "  ***************************************************************************" <<endl;
	cout << "  *                     <<<Welcome to SMW Company>>>                        *\n" <<endl;
	cout << "  *  This program takes your to buy a car that you are looking for          *" << endl;
	cout << "  *  and returns the answer to the screen. If an illegal operator is        *" << endl;
	cout << "  *  selected, an error message will be displayed. Be careful which         *" <<endl;
	cout << "  *  number you select because the program depends on you for input.        *" <<endl;
	cout << "  *  The only error check function it has, is for unacceptable opreators.   *" <<endl;
	cout << "  *  Acceptable operators are : (1 , 2 , 3 and 4). The character c sets     *" <<endl;
	cout << "  *  the value stored to ZERO. ENJOY YOUR PROGRAM !!!!!!                    *" <<endl;
	cout << "  ***************************************************************************" <<endl;
	cout <<endl;
}
 
 
 
void start()
{
	char choice;
 
	cout<<"\n\n1. New Account Sign Up\n2. Login\n"<<endl;
    cin >> choice;
 
	if(choice=='1')
		new_member();
	else if(choice=='2')
		login();
	else
	{
		cout<<"Invalid input"<<endl;
		start();
	}
}
 
 
//The new user function as implied in the name adds a new user to the record
 
void new_member()
{
     fstream log_member;										//Initializing file
     log_member.open ("members.txt");							// opening a file
 
     int i=0;													//Loop used to read all existing members into memory
 
 
	 while(log_member>>members[i].member_name && log_member>>members[i].member_pass && log_member>>members[i].balance)
	 {
      i++;
     }
 
     //20 is the max number of members, so if i is >= 20 then that means there is no more space, but hopefully not :)
	 if(i<20)
     {
	  cout<<"Enter new Username (Max 12 Characters) : ";
      cin >> members[i].member_name;
 
      cout<<"Enter new Password (Max 10 Characters) : ";
      cin >> members[i].member_pass;
 
	  members[i].balance=0;										//Initializes new user balance to RM 0
	  position=i;
      counter=position;
 
      log_member.close();
	 }
 
	 else
	 {
		 cout<<"Maximum limit of members reached"<<endl;
	 }
 
 
}
 
 
//Login function logs in an existing member by reading the member name and password, 
//and then checking it with existing member names and passwords
 
void login()
{
	fstream log_member;											//Initilizing and opening a file
	char member_name[12],password[10];							//Initializing arrays to store member name and password
	position = -1;
 
	cout<<"Member's name : ";
	cin >> member_name;
	cout<<"Password      : ";
	cin >> password;
 
	log_member.open("members.txt");
 
	//This loops reads throuhg all existing member names and pasword sets,
	//and if any set mathces the one entered then it allocates to variable position
	//and then continues the loop till it reads all
 
	for (int i = 0; log_member>>members[i].member_name && log_member>>members[i].member_pass && log_member>>members[i].balance; i++)
	{
		if(members[i].member_name == member_name && members[i].member_pass == password)
		{
			position = i;
		}
		else
		{
			position = position;
		}
	}
 
	if(position>=0)												//This checks to see if the member has been found
	{
		log_member.close();
	}
	else														//This alerts the user that the details he/she entered were not found
	{
		cout<<"Incorrect username or password!"<<endl;			//cout<<"Position: "<< position <<endl;
 
		log_member.close();
		start();
	}
 
	log_member.close();
}
 
 
void options()													//Options functions comes after login and it gives the member his next options
{
	char option;
 
	cout<<"\n\nWelcome to your account "<<members[position].member_name<<endl;
	cout<<"\nChoose an option :"<<endl;
	cout<<"\n1. View Account Summary\n2. Order\n3. View Shopping Cart\n4. Logout\n"<<endl;
	cin >> option; 
 
    switch (option)												//Switch is used to select his chosen option 
	{
		case '1':
			view_account();
			break;
		case '2':
			order();
			break;
		case '3':
			view_cart();
			break;
		case '4':
			logout();
			break;
		default:
			cout<<"Invalid input"<<endl;
			options();
	}
}
 
 
//View account function gives the member some options to look into his/her account details like balance, Add_to_balance money and loging out
 
void view_account()
{
	char option;
 
	cout<<"\n1. Balance\n2. Add to my balance\n3. Return to Previous Menu\n4. Logout"<<endl;
	cin >> option;
 
	switch (option)
	{
		case '1':
			{
				cout<<"\nYour Available Balance is RM "<< members[position].balance <<endl;
				view_account();
			}
			break;
		case '2':
			{
				Add_to_balance();
			}
			break;
		case '3':
			{
				options();
			}
			break;
		case '4':
			{
				logout();
			}
			break;
		default:
			{
				view_account();
			}
	}
}
 
 
//Add_to_balance function adds money to the member existing balance
//We assume the member has a valid third party bank account
//So all that is need to be done is to specify the amount and add to
//his/her balance
 
void Add_to_balance()
{
	float Add_to_balancement=0;
 
	cout<<"The amount : ";
	cin>>Add_to_balancement;
 
	members[position].balance += Add_to_balancement;
 
	cout<<"The Add_to_balancement has been successful added :)"<<endl;
	cout<<members[position].member_name<<" current balance is RM "<< members[position].balance <<endl;
 
	view_account();
}
 
 
void order()
{
	//Gives member options to choose whic list to view
 
	char option, choice;
	cout<<"\nChoose which list you would like to view"<<endl;
	cout<<"\n1. Buy car\n2. Rent car\n3. Return to Previous Menu"<<endl;
	cin >> option;
 
	//The option chosen is passed to another function used to display the items
 
	display_items(option);
 
	cout<<"1.Add item to the order\n2.Retun to previous menu"<<endl;
	cin >> choice;
 
	if (choice == '1')
	{
		//Option chosen passed on to another function to add to cart
		add_to_cart(option);
	}
	else
	{
		//Directs to the view the list option
		order();
	}
 
	//After a member adds a item then he/she is immediately shown his/her cart
	view_cart();
}
 
 
//view_cart function shows the member his/her cart
 
void view_cart()
{
	char choice;
	cout<<"\n"<<members[position].member_name<<" item(s) :\n"<<endl;
	cout<<"**********************************************************************"<<endl;
	cout<<"ID"<<"\t\t"<<" Item Name"<<"\t\t\t"<<"Price"<<endl;
	cout<<"**********************************************************************"<<endl;
 
 
	for (int i = 0; i < size; i++)								//This loop prints out all items in cart
	{
		cout<<cart[i].id<<"\t\t"<<cart[i].name<<"\t\t"<<cart[i].price<<endl;
	}
 
	//More options avaliable since use may want to check out right away
	cout<<"\n1.Checkout Item(s)\n2.Drop item(s)\n3.Add item(s)\n4.Return to previous menu"<<endl;
	cin >> choice;
 
	switch (choice)
	{
		case '1':
			check_out();
			break;
		case '2':
			drop();
			break;
		case '3':
			order();
			break;
		case '4':
			options();
			break;
		default:
			cout<<"Invalid input"<<endl;
			view_cart();
	}
}
 
 
//Drop function drops last item added, since we are storing added items to cart in arrays
//we have only enough knowledge to drop the last one entered
 
void drop()
{
	//Since variable 'size' it what we use to store the number of elements in the cart array
	//all we need to to is rollback one step in order to remove the last item 
     size -= 1;
     cout<<"You last item has been dropped succesfully :)"<<endl;
     options();
}
 
//Display items function displays the items the member wants, 
//the function is passed a value which it acts on to show the required item 
 
void display_items(char option)
{
      switch (option)
     {
            case '1':
				{
					//Initializes file for reading n writing
					ifstream personal_cars_file ("personal cars.txt");
 
					for(int i=0; i<20; i++)						//loops through the whole file
					{
						//Stores the first value before a space in the line as 'id'
						personal_cars_file>>personal_cars[i].id;
 
						//Stores the next after the space as name until it reaches a tab
						personal_cars_file.get(personal_cars[i].name, 100 ,'\t');
 
						//Then stores the next as price
						personal_cars_file>>personal_cars[i].price;
 
						//It then prints out what it just read to the screen
						cout<<personal_cars[i].id<<"\t"<<personal_cars[i].name<<"\t"<<personal_cars[i].price<<endl;
					}
					personal_cars_file.close();					//Closes the file
				}
				break;
 
			//Same as above happens on the rest, exept it does it with different files
			case '2':
				{
					int days;
 
					cout<<"How many day(s) you want to rent the car?"<<endl;
					cin>>days;
 
					fstream rent_cars_file ("rent_cars.txt");
 
					for(int i=0; i<10; i++)
					{
						rent_cars_file>>rent_cars[i].id;
						rent_cars_file.get(rent_cars[i].name, 100 ,'\t');
						rent_cars_file>>rent_cars[i].price;
						cout<<rent_cars[i].id<<"\t"<<rent_cars[i].name<<"\t"<<(rent_cars[i].price)*days<<endl;
					}
 
					rent_cars_file.close();
				}
				break;
 
			case '3':
				options();
				break;
 
            default:
				{
					cout<<"\nInvalid Input"<<endl;
					order();
				}
	  }
}
 
 
void add_to_cart(char option)									//This function adds a selected item to the cart
{																//It is passed a value which determines which list the member is refereing to
	int id;
 
	//The if statement is a validity checker that check if the cart is full or not
	if (size < 10)
	{
		switch (option)
		{
			case '1':
				{
					cout<<"Enter the item ID: ";
					cin >> id;
 
 
					cart[size] = personal_cars[id-1];			//This maps the selected item to the cart
					size++;
					cout<<"Your item has been added to "<<members[position].member_name<<" cart successfully :)"<<endl;
				}
				break;
			case '2':
				{
					cout<<"Enter the item ID: ";
					cin >> id;
 
					cart[size] = rent_cars[id-1];
					size++;
					cout<<"Your item has been added to "<<members[position].member_name<<" cart successfully :)"<<endl;
				}
				break;
			default:
				cout<<"Invalid input"<<endl;
				order();
		}
	}
 
	//This means the cart is full so it alerts the member
	else
	{
		cout<<"Cart full"<<endl;
		order();
	}
}
 
//Checkout is like buying the item(s)
void check_out()
{
	char choice;
	double total = 0;
 
 
	for (int i = 0; i < size; i++)								//This loop sums the total of the item(s) added to the cart
	{
		total += cart[i].price;
	}
 
	if ( total > members[position].balance)						//This statement checks whether the member has enouhgh balance
	{
		cout<<"\n\nSorry you have insufficient funds to continue the transaction"<<endl;
		cout<<"\n\n1.Add_to_balance\n2.Drop last item\n3.Order\n4.Logout"<<endl;
		cin >> choice;
 
		switch (choice)
		{
			case '1':
				Add_to_balance();
				break;
			case '2':
				drop();
				break;
			case '3':
				order();
				break;
			case '4':
				logout();
				break;
			default:
				cout<<"Invalid input"<<endl;
				check_out();
		}
	}
	else
	{
		members[position].balance -= total;						//It deducts the total sum of the items from his/her balance
 
		cout<<members[position].member_name<<" cart have been checked out successfully :)"<<endl;
 
		cout<<"The remaining balance is   : "<< members[position].balance <<endl;
 
		receipt(total);
		update();
		size=0;
		counter=0;
		position=0;
 
		for (int i = 0; i < size; i++)
		{
			cart[i].id=('0');
		}
		main();
	}
 
}
 
//Update function writes all the edited information of the member back to the text file
 
void update()
{
	fstream log_member;
	log_member.open ("members.txt");
 
	//Loop used to get to the member info
	for (int i = 0; i <= position; i++)
	{
		log_member<< members[i].member_name <<" ";
		log_member<< members[i].member_pass <<" ";
		log_member<< members[i].balance <<" ";
	}
	log_member.close();
}
 
void receipt(double total)
{
	cout<<"\nPrinting "<<members[position].member_name<<" receipt.."<<endl;
	cout<<"***********************************************************************"<<endl;
	cout<<"\t\t\tSMW Company\n";
	cout<<"\t\t  TEL: +60173784877"<<endl;
	cout<<"\t\t    IIUM, Gombak"<<endl;
	cout<<"----------------------------------------------------------------------"<<endl;
	cout<<"ID"<<"\t\t"<<" Car Name"<<"\t\t\t"<<"Price"<<endl;
	cout<<"----------------------------------------------------------------------"<<endl;
 
	for (int i = 0; i < size; i++)
	{
		cout<<cart[i].id<<"\t\t"<<cart[i].name<<"\t\t"<<cart[i].price<<endl;
	}
 
	cout<<"***********************************************************************"<<endl;
	cout<<"Cart Total\t\t\t\t"<<total<<endl;
	cout<<"Tax 2%\t\t\t\t\t"<<(total*2)/100<<endl;
 
	cout<<"Total\t\t\t\t\t"<<(total)+((total*2)/100)<<endl;
 
	cout<<"\t\tTHANK YOU "<<members[position].member_name<<"\n\tIT WAS OUR PLEASURE SERVING YOU\n";
}
 
//Logout finally updates the member info and then exits the program
 
void logout()
{
	update();
	size=0;
	counter=0;
	position=0;
 
	for (int i = 0; i < size; i++)
	{
		cart[i].id=('0');
	}
 
	cout<<"\nYou have succesfully logged out\n\n\n\n"<<endl;
	main();
}