#include <iostream>
#include <stdlib.h>
#include <windows.h>
using namespace std;

void tutorial(){
    system("cls");
    cout<<"Welcome To This User-Friendly Tutorial!\n";
    cout<<"To Use This Machine, You Want To Type Your Order In The Console By Typing Its Order Index.\n";
    cout<<"For Example, wanting To Print Your Bill, Input '2'.\n";
    cout<<"It's Pretty Simple, If You Need Further Assistance, Don't Hesitate To Call Our Staff By Inputting '3'.\n"<<flush;
    system("pause");
    system("cls");
}

void customerMenu(){
    cout<<"Welcome to the Customer Menu, What Would You Like To Do?\n";
    cout<<"1. Start Ordering\n";
    cout<<"2. Print Bill\n";
    cout<<"3. Need Assistance?\n";
    cout<<"4. Exit\n";
    cout<<"5. Go To Staff Menu\n";
}

void staffMenu(){
    cout<<"Welcome Back Staff, What Would You Like To Do?\n";
    cout<<"1. Check Number Of Cups Sold\n";
    cout<<"2. Amount Of Coffee Sold\n";
    cout<<"3. Amount Of Money Earned\n";
    cout<<"4. Exit\n";
    cout<<"5. Go To Customer Menu\n";
}

void buyCoffe(int &small, int &medium, int &large){
    int cupOrder = 0, cupAmount = 0;
    do{
	    cout<<" ------------------------------------- \n";
	    cout<<"| 1. Small Cup  (9 Oz)  ---- $1.75    |\n";
	    cout<<"| 2. Medium Cup (12 Oz) ---- $1.90    |\n";
	    cout<<"| 3. Large Cup  (15 Oz) ---- $2.00    |\n";
	    cout<<"| 4. Go Back                          |\n";
	    cout<<" ------------------------------------- \n";
        cout<<"Which Size Would You Like To Order?\n";
        cin>>cupOrder;
        if(cupOrder == 1){
            cout<<"How Much Small Cup Would You Like? (Press '0' to go back)\n";
            do{
                cin>>cupAmount;
                if(cupAmount > 0){
                    cout<<"We Have Added "<<cupAmount<<" Small Cups To Your Bill.\n";
                    small += cupAmount;
                    system("pause");
                    system("cls");
                }
                else if(cupAmount < 0){
                    cout<<"We Don't Serve Negative Amounts..\n";
                    cout<<"Please Input The Amount Again: \n";
                }
            }while(cupAmount < 0);
        }
        else if(cupOrder == 2){
            cout<<"How Much Medium Cup Would You Like? (Press '0' to go back)\n";
            do{
                cin>>cupAmount;
                if(cupAmount > 0){
                    cout<<"We Have Added "<<cupAmount<<" Medium Cups To Your Bill.\n";
                    medium += cupAmount;
                    system("pause");
                    system("cls");
                }
                else if(cupAmount < 0){
                    cout<<"We Don't Serve Negative Amounts..\n";
                    cout<<"Please Input The Amount Again: \n";
                }
            }while(cupAmount < 0);
        }
        else if(cupOrder == 3){
            cout<<"How Much Large Cup Would You Like? (Press '0' to go back)\n";
            do{
                cin>>cupAmount;
                if(cupAmount > 0){
                    cout<<"We Have Added "<<cupAmount<<" Large Cups To Your Bill.\n";
                    large += cupAmount;
                    system("pause");
                    system("cls");
                }
                else if(cupAmount < 0){
                    cout<<"We Don't Serve Negative Amounts..\n";
                    cout<<"Please Input The Amount Again: \n";
                }
            }while(cupAmount < 0);
        }
        else if(cupOrder < 1 || cupOrder > 4){
            cout<<"Please Input One Of These Numbers (1/2/3/4)\n";
            system("cls");
        }
        else{
            cout<<"Going Back To Main Menu...\n";
            Sleep(700);
            system("cls");
        }
    }while(cupOrder != 4);
}

void printBill(int small, int medium, int large){
    const double smallCup = 1.75, mediumCup = 1.90, largeCup = 2.00;
    double totalSmall, totalMedium, totalLarge;

    totalSmall = small * smallCup;
    totalMedium = medium * mediumCup;
    totalLarge = large * largeCup;

    if(small > 0 || medium > 0 || large > 0){
        cout<<"--------------------------------------\n";
        cout<<"\t\tYour Bill\t\t\n";
        if(totalSmall > 0){
            cout<<"Small Cup ($1.75)\tx"<<small<<"\t$"<<totalSmall<<endl;
        }
        if(totalMedium > 0){
            cout<<"Medium Cup ($1.90)\tx"<<medium<<"\t$"<<totalMedium<<endl;
        }
        if(totalLarge > 0){
            cout<<"Large Cup ($2.00)\tx"<<large<<"\t$"<<totalLarge<<endl;
        }
        cout<<"                                       \n";
        cout<<"Total: \t\t\t\t$"<<totalSmall+totalMedium+totalLarge<<endl;
        cout<<"--------------------------------------\n";
    }
    else{
        system("cls");
        cout<<"There Is Nothing In Your Order List\n";
        cout<<"Going Back To Menu..."<<flush;
        system("pause");
    }
}

void cupSold(int &small, int &medium, int &large){
    cout<<"Total Amount Of Small Cup Sold: "<<small<<endl;
    cout<<"Total Amount Of Medium Cup Sold: "<<medium<<endl;
    cout<<"Total Amount Of Large Cup Sold: "<<large<<endl;
    cout<<"Total Amount Cup Sold: "<<small+medium+large<<endl;
}

void coffeSold(int &small, int &medium, int &large){
    const int smallVol = 9, mediumVol = 12, largeVol = 15;
    cout<<"Total Volume Of Small Coffee Sold: "<<smallVol*small<<" Oz"<<endl;
    cout<<"Total Volume Of Medium Coffee Sold: "<<mediumVol*medium<<" Oz"<<endl;
    cout<<"Total Volume Of Large Coffee Sold: "<<largeVol*large<<" Oz"<<endl;
    cout<<"Total Volume Coffee Sold: "<<smallVol*small+mediumVol*medium+largeVol*large<<" Oz"<<endl;
}

void moneyEarned(int &small, int &medium, int &large){
    const double smallCup = 1.75, mediumCup = 1.90, largeCup = 2.00;
    cout<<"Total Money Earned From Small Cup: $"<<small*smallCup<<endl;
    cout<<"Total Money Earned From Medium Cup: $"<<medium*mediumCup<<endl;
    cout<<"Total Money Earned From Large Cup: $"<<large*largeCup<<endl;
    cout<<"Total Money Earned: $"<<small*smallCup+medium*mediumCup+large*largeCup<<endl;
}

int main(){
    int menuOrder = 0, staffOrder = 0, smallCup = 0, mediumCup = 0, largeCup = 0;
    string uiAns = "idk", tutAns;

    cout<<"Welcome To J's Coffee Self-Service Machine!!\n";
 	cout<<"Do You Want to Read The Tutorial On How to Use This Machine? (y/n)";cin>>tutAns;
	system("cls");

    do{
    	if(tutAns == "y" || tutAns == "Y"){
            tutorial();
	        break;
	        }
	    else if(tutAns == "n" || tutAns == "N"){
	        break;
	    }
	    else{
	    	cout<<"I Didn't Quite Catch That...\n";
	        system("pause");
	        system("cls");
	    }
	}while(tutAns != "y" || tutAns != "Y" || tutAns != "n" || tutAns != "N");

    do{
        do{
	        if(uiAns == "y" || uiAns == "Y"){

	            do{
	                customerMenu();
	                cin>>menuOrder;
	                system("cls");
	                if(menuOrder == 1){
	                    buyCoffe(smallCup, mediumCup, largeCup);
	                }
	                else if(menuOrder == 2){
	                    printBill(smallCup, mediumCup, largeCup);
	                    cout<<"Redirecting To Main Menu...";
	                    system("pause");
	                    system("cls");
	                }
	                else if(menuOrder == 3){
	                    cout<<"We Are Contacting Available Staffs...\n";
	                    cout<<"Please Wait Until Our Staff Come To Assist You...\n";
	                    system("pause");
	                    system("cls");
	                }
	                else if(menuOrder == 4){
	                    cout<<"Thank You For Using J's Coffee Self-Service Machine!\n";
	                    cout<<"We Hope To See You Soon...\n";
	                    cout<<"Have A Nice Day!\n";
	                    Sleep(800);
	                    return 0;
	                }
	                else if(menuOrder == 5){
	                	menuOrder = 4;
	                	uiAns = "n";
	                	break;
					}
	                else{
	                    cout<<"Your Input Was Not Understood, Please Input The Numbers (1/2/3/4).";
	                }
	            }while(menuOrder != 4);
	        }
	        else if(uiAns == "n" || uiAns == "N"){
	        	system("cls");
	            do{
	                staffMenu();
	                cin>>staffOrder;
	                system("cls");
	                if(staffOrder == 1){
	                	system("cls");
	                    cupSold(smallCup, mediumCup, largeCup);
	                    system("pause");
	                    system("cls");
	                }
	                else if(staffOrder == 2){
	                	system("cls");
	                    coffeSold(smallCup, mediumCup, largeCup);
	                    system("pause");
	                    system("cls");
	                }
	                else if(staffOrder == 3){
	                	system("cls");
	                    moneyEarned(smallCup, mediumCup, largeCup);
	                    system("pause");
	                    system("cls");
	                }
	                else if(staffOrder == 4){
	                    cout<<"Thank You For Using J's Coffee Self-Service Machine!\n";
	                    cout<<"We Hope To See You Soon...\n";
	                    cout<<"Have A Nice Day!\n";
	                    Sleep(800);
	                    return 0;
	                }
	                else if(staffOrder == 5){
	                	staffOrder == 4;
	                	uiAns = "y";
	                	break;
					}
	                else{
	                    cout<<"Your Input Was Not Understood, Please Input The Numbers (1/2/3/4).\n";
	                }
	            }while(staffOrder != 4);
	        }
	        else{
	        	cout<<"Are You A Customer? (y/n)";cin>>uiAns;
	        	system("cls");
	        }
		}while(uiAns != "this is the end");
    }while(uiAns != "y" || uiAns != "Y" || uiAns != "n" || uiAns != "N");

}