#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <conio.h>

using namespace std;
/*
* Node Declaration
*/

class Register{
	public:
		string ic, password;
};

class Login{
	public:
		string inputIC, inputPass;
};

struct customer
{
	int priority;
	int age;
	string name;
	string address;
	string ic;
	string tele_num;
	customer *link;
	
		customer(int age,string name, string address, string ic, string tele_num)
		{
			this->age = age;
			this->name = name;
			this->address = address;
			this->ic = ic;
			this->tele_num = tele_num;
		}
		customer(){
			
		}
};

class Queue
{
	private:
		customer *front;
		customer *temp1;
		int prioritytemp=1;

	public:
		
		Queue()
		{
			front = NULL;
		}


	//set priority for the latest registered customer
	void setpriority()
	{
		customer *q;
		int priority,choice;
		
		cout << "The latest registered customer is " << temp1->name << endl;
		
		cout << "Are you sure you want to set priority for this customer? (1)YES  (0)NO" << endl;  //COMFIRMATION TO SET FOR THIS CUSTOMER
		cin >> choice;
		
		
		if(choice == 1){
			cout<<"\nENTER THE PRIORITY NUMBER YOU WANT THE CUSTOMER TO BE SET : "; //ADMIN DECLARE PRIORITY FOR LATEST REGISTERED CUSTOMER  
			cin>>priority;
			temp1->priority = priority;
	
			if (front == NULL || priority < front->priority) //TO SET WHEN priority entered is less than front->priority
			{
				temp1->link = front;
				front = temp1;
			}
			else  //TO SET WHEN priority entered is larger than front->priority
			{
				q = front;
				while (q->link != NULL && q->link->priority <= priority)
					q=q->link;
				temp1->link = q->link;
				q->link = temp1;
			}
		}else if (choice == 0){
			
		}else{
			cout << "INVALID INPUT" << endl;
		}
	
	}

	bool dequeue()
	{
		customer *tmp=new customer;
		
		if(front == NULL){   // ERROR MESSAGE IF NULL IN QUEUE
			cout<<"THERE IS NO CUSTOMER IN THE QUEUE"<<endl;
			return false;
		}

		else  //TO CALL OUT CUSTOMER AND DEQUEUE
		{
			int choice;
			tmp = front;
			
			cout<<"Mr/Mrs " <<tmp->name<<" Please Come Forward To Get Your Vaccine!"<<endl;
			
			
			front = front->link;
			free(tmp);
			return true;
		}
	}
	
	//customer enqueue
	void cEnqueue()
	{
	   string n, ic, address, hp;
	   int a;
		customer *newNode = new customer;
	   
	   cin.ignore();
	   cout << "\nPlease Enter your Name            : ";
	   getline(cin, n);
	   cout << "\nPlease Enter your IC              : ";
	   getline(cin, ic);
	   cout << "\nPlease Enter your Age             : ";
	   cin >> a;
	   cin.ignore();
	   cout << "\nPlease Enter your Address         : ";
	   getline(cin, address);
	   cout << "\nPlease Enter your Contact Number  : ";
	   cin >> hp;
	   
	   newNode->name = n;
	   newNode->ic = ic;
	   newNode->age = a;
	   newNode->address = address;
	   newNode->tele_num = hp;
	   newNode->priority = prioritytemp;
	   prioritytemp++;
	   
	   temp1 = newNode;
   
	   if (front == NULL) {     //queue is empty
	      front = newNode;
	      front->link = NULL;
	   } else {              //queue not empty
	      customer *temp=front;
	      
	      while(temp->link!=NULL)
	      {
	      	temp = temp->link;
		  }
		temp->link = newNode;
		newNode->link = NULL;
		}	
	}
	
	//customer cancel vaccine registration
	void remove(string IC) {
	   customer *curr = front;
	   customer *prev = NULL;
	   
	   if (front == NULL) {
	      cout<<"Record not found"<<endl;
	      return;
	   }
	
		while (curr && curr->ic != IC) { 
		 prev = curr;   
		 curr = curr->link; 
		}
		
		if(curr==NULL)
		{
			cout << "Record not found" << endl;
	   		cout<<endl;
	   		return;
		}
		if (curr) {  
			 if (prev) {
			  cout << curr->name << " " << "is deleted from vaccine registration."<< endl;
			  prev->link = curr->link; 
			  delete curr;  
			  return;
			}
			else 
			 { //front node
			 cout << curr->name << " " << "is deleted from vaccine registration."<< endl;
			 front = curr->link;   
			 delete curr;   
			 return;
			}
		}
	}

	//Display the registration details of specific customer
	void display(string IC) {
	   customer *temp = front;
	   
	   cout<<"\nRegistration Details: " << endl;
	   
	   while (temp != NULL) {
	   	  if(temp->ic==IC)
	   	  {
	   	  	cout << "\nName      : "<< temp->name << "\n\nIC Number : " << temp->ic << "\n\nAge       : " 
				 << temp->age << "\n\nAddress   : " << temp->address << "\n\nContact   : " << temp->tele_num << endl;
	   	  	return;
	      }
	      else
	      {
	      	temp = temp->link;
		  }
	   }
	   cout << "Record not found" << endl;
	   cout<<endl;
	}
	
	//Display all registration details of customer
	void displayList()
	{
		customer *temp = front;
		customer *rear = NULL;
   		if ((front == NULL) && (rear == NULL)) 
		{
			cout<<"====================    LIST OF VACCINE DEPENDENTS    ===================="<<endl;
			cout<<"--------------------------------------------------------------------------"<<endl << endl;
        	cout<<"There are no patient appointments for Vaccination"<<endl;
        	return;
   		}
   		
		    cout<<"====================    LIST OF VACCINE DEPENDENTS    ===================="<<endl;
			cout<<"--------------------------------------------------------------------------"<<endl;
		    cout<< endl << endl;
		    
   			while (temp != NULL) 
			{
      		cout << "- " << temp->name << ", " << temp->ic << ", " << temp->age << ", " << temp->address << ", " << temp->tele_num << endl;
      		temp = temp->link;
   			}
   		cout<<endl;
	}
	
	//search for specific patient
	void search(string IC) {
	   customer *temp = front;
	   
	   cout << endl << endl;
	   cout<<"====================    SEARCH FOR VACCINE DEPENDENTS     ===================="<<endl;
	   cout<<"------------------------------------------------------------------------------"<<endl;
	   
	   while (temp != NULL) {
	   	  if(temp->ic==IC)
	   	  {
	   	  	cout << "\nName      : "<< temp->name << "\n\nIC Number : " << temp->ic << "\n\nAge       : " 
				 << temp->age << "\n\nAddress   : " << temp->address << "\n\nContact   : " << temp->tele_num << endl;
	   	  	return;
	      }
	      else
	      {
	      	temp = temp->link;
		  }
	   }
	   cout << "Record not found" << endl;
	   cout<<endl;
	}
};
//DECLARATION OF CUSTOMER NODE
class counterNode{
	public:
		int counterNo;
		string vaccinetype;
		int status;
		counterNode *next;
		counterNode *prev;
};

string status(int status){
	if(status==1){
		return "PATIENT INSIDE";
	}
	else if(status==0){
		return "AVAILABLE";
	}
	else{
		return "DEFAULT";
	}
}

//DECLARATION OF COUNTERNODE
class counter{
	private:
		counterNode *head;
		
	public:
		counter(){
			head=NULL;
		}
		
		void insertCounter(int counterNo,int vaccinetype){  //INSERT A NEW COUNTER
			int currIndex=0;
			counterNode *currNode=head;
			counterNode *prevNode=NULL;
				while(currNode && counterNo > currNode->counterNo){
					prevNode=currNode;
					currNode=currNode->next;
					currIndex++;	
				}	
			counterNode *newNode=new counterNode;
			newNode->counterNo=counterNo;
			if (vaccinetype == 1){
				newNode->vaccinetype="Pfizer BioNTech";
			}
			else if (vaccinetype == 2){
				newNode->vaccinetype="Sinovac CoronaVac";
			}
			else if (vaccinetype == 3){
				newNode->vaccinetype="Oxford AstraZeneca";
			}
			newNode->status=0;
			if (currIndex==0){
				newNode->next=head;
				head=newNode;
			}
			else{
				newNode->next=prevNode->next;
				prevNode->next=newNode;
			}
		}
		
		void deleteCounter(int cn){ //DELETE A COUNTER
			counterNode* prevNode = NULL;
			counterNode* currNode = head;
			int currIndex = 1;
			while (currNode && currNode->counterNo != cn) {
				prevNode = currNode;
				currNode = currNode->next;
				currIndex++;
			}
			if (currNode) {
				if (prevNode) {
					prevNode->next = currNode->next;
					delete currNode;
				}
				else {
					head = currNode->next;
					delete currNode;
				}
				cout<<"YOU SUCCESSFULLY DELETE COUNTER # :"<<cn<<endl;
	        }
	        else{
	        	cout<<"COUNTER #("<<cn<<") DOES NOT EXIST."<<endl;	
			}
		}
		bool toCounter(int cn){ //TO ASSIGN CUSTOMER TO THIS COUNTER
			counterNode *newNode=new counterNode;
			newNode=findCounter(cn);
			if(!newNode){
				cout<<"COUNTER # "<<cn<<" CANNOT BE FOUND\n"<<endl;
				return false;
			}
			else{
				if(newNode->status==0){
					newNode->status=1;
					cout<<"COUNTER # "<<cn<<" IS AVAILABLE\n\n"<<endl;
					return true;
				}
				else{
					cout<<"COUNTER # "<<cn<<" IS NOT AVAILABLE\n\n"<<endl;
					return false;
				}
			}
		} 
		
		bool updateCounter(int cn){ // to UPDATE THE COUNTER AS AVAILABLE WHEN NO MORE PATIENT INSIDE
			counterNode *newNode=new counterNode;
			newNode=findCounter(cn);
			if(!newNode){
				cout<<"COUNTER # "<<cn<<" CANNOT BE FOUND"<<endl;
				return false;
			}
			else{
				if(newNode->status==1){
					newNode->status=0;
					cout<<"COUNTER # "<<cn<<" IS SUCCESSFULLY UPDATED"<<endl;
					return true;
				}
			}
		}
		
		counterNode* findCounter(int cn){		//TO CHECK IF COUNTER EXIST	
			counterNode* currNode = head;
			int currIndex = 1;
			while (currNode && currNode->counterNo != cn) {
			currNode = currNode->next;
			currIndex++;
			}
			if (currNode)
				return currNode;
			else
			return 0;
		}
		
		void displayCounter() // TO DISPLAY COUNTERS
		{
			counterNode* currNode = head; 
			cout<<"====================    COUNTERS IN THIS PPV    ===================="<<endl;
			cout<<"--------------------------------------------------------------------"<<endl;
			cout<<"COUNTER #\tVACCINE TYPE\tSTATUS"<<endl;
			
			
			while (currNode != NULL){ 
				cout <<currNode->counterNo<<"\t"
					 <<currNode->vaccinetype<<"\t\t"
					 <<status(currNode->status)<<"\t"
					 << endl; 
				currNode = currNode->next; 
			} 
		}
};

int main()
{
	int ch; 			//choice for customer menu
	Queue pq;
	counter c;
	//INSERT PRE-DEFAULT COUNTERS
	c.insertCounter(1001,1);
	c.insertCounter(1002,2);
	c.insertCounter(1003,3);

	
	Register newUser;
	int choice;
	
	mainmenu:
	 system("CLS");
	   cout<<"========================================================\n"
		   <<"=    Welcome to our VACCINE QUEUE SIMULATION SYSTEM    =\n"
		   <<"========================================================\n";
	   cout<<"=                  (1) Admin                           ="<<endl;
	   cout<<"=                  (2) Customer                        ="<<endl;
	   cout<<"=                  (3) Exit                            ="<<endl;
	   cout<<"========================================================"<<endl;
	   cout<<"Enter your choice :"<<endl;
	   cin >> choice;
   
   if(choice==1)
   {
   		admin:
		system("CLS");
		   cout<<"========================================================\n"
			   <<"=  	     VACCINE QUEUE SIMULATION SYSTEM           =\n"
			   <<"=   		        (ADMIN)                        =\n"
			   <<"========================================================\n";
		   cout<<"=                  (1) Create account                  ="<<endl;
		   cout<<"=                  (2) Login                           ="<<endl;
		   cout<<"=                  (3) Exit                            ="<<endl;
		   cout<<"========================================================"<<endl;
		   cout<<"Enter your choice :"<<endl;
		   cin>>ch;
				
		   if(ch==1)
		   {
		   		system("CLS");
		   		//register
		   		cout << "CREATE YOUR ACCOUNT" << endl;
		   		cout << "-------------------" << endl;
		   		cout << "\nEnter your ic number: ";
		   		cin >> newUser.ic;
		   		cout << "\nEnter your desired passsword: ";
		   		cin >> newUser.password;
		   		
		   		cout << "\n\nSuccessfully Create your Account!. Please Login." << endl;
		   		cout << "====================================================" << endl << endl;
		   		
		   		goto loginadmin;
		   }
		   else if(ch==2)
		   {
		   		system("CLS");
		   		goto loginadmin;
		   }
		   else{
		   		exit(0);
		   }
		   
		   	loginadmin: 
		  	Login newLogin;
		   	cout << "IC: ";
		   	cin >> newLogin.inputIC;
		   	cout << "Password: ";
		   	cin >> newLogin.inputPass;
		   		
		   	if(newLogin.inputIC == newUser.ic && newLogin.inputPass == newUser.password){
		   		cout << "\nSuccessfully Login!";
			adm:
			system("CLS");
			cout<<"========================================================\n"
				<<"=            VACCINE QUEUE SIMULATION SYSTEM           =\n"
				<<"========================================================\n";
		   cout<<"=                  (1) ADD COUNTER                        ="<<endl;
		   cout<<"=                  (2) DELETE COUNTER                     ="<<endl;
		   cout<<"=                  (3) DISPLAY COUNTER                    ="<<endl;
		   cout<<"=                  (4) CALL CUSTOMER TO COUNTER           ="<<endl;
		   cout<<"=                  (5) SET PRIORITY FOR ELDERLY           ="<<endl;
		   cout<<"=                  (6) UPDATE COUNTER (NO PATIENT INSIDE) ="<<endl; 
		   cout<<"=                  (7) DISPLAY ALL PATIENT                ="<<endl; 
		   cout<<"=                  (8) SEARCH FOR PATIENT                 ="<<endl; 
		   cout<<"=                  (9) EXIT                               ="<<endl;
		   cout<<"========================================================"<<endl;
		   cout<<"Enter your choice :"<<endl;
		   cin>>ch;
		   
		   int cn;
		   int vt;
		   if(ch==1) // OPTION 1
		   {
			   	system("CLS");
			   	int control = 1;
			   	do{
			   		cout<<"\nENTER THE COUNTER # YOU WANT TO ADD : ";
			   		cin>>cn;
			   		
			   		cout<<"\nENTER THE VACCINE TYPE FOR THIS COUNTER (1)PFIZER (2)SINOVAC (3)AZ : ";
			   		cin>>vt;
			   		
			   		if(!c.findCounter(cn)){
						c.insertCounter(cn,vt);
						cout<<"YOU SUCCESSFULLY ADD COUNTER # ("<<cn<<") TO THE LIST"<<endl;
					}
					else{
						cout<<"COUNTER # "<<cn<<" EXISTED.  ENTER OTHER COUNTER #."<<endl;
					}
					cout<<"DO YOU WANT TO CONTINUE TO ADD MORE COUNTER ( 1-YES, 0-NO ) :";
					cin>>control;
		
				}while(control==1);
		   }
		   else if(ch==2) // OPTION 2
		   {
		   		system("CLS");
		   		int control=1;
				do{
					cout<<"\nENTER THE COUNTER # YOU WANT TO DELETE : ";
					cin>>cn;
					
					if(c.findCounter(cn)){
						c.deleteCounter(cn);
					}
					else{
						cout<<"COUNTER CANNOT BE FOUND! ENTER OTHER COUNTER #."<<endl;
					}
					
					cout<<"DO YOU WANT TO CONTINUE TO DELETE MORE COUNTER( 1-YES, 0-NO ) : ";
					cin>>control;
				}while(control==1);
		   }
		   else if(ch==3) // OPTION 3
		   {	
		   		system("CLS");
				c.displayCounter();
		   }
		   else if(ch==4) // OPTION 4
		   {	
		   		system("CLS");
		   		int control = 1;
		   		do{
		   			cout<<"\nENTER THE COUNTER # YOU WANT THE CUSTOMER TO GO : ";
					cin>>cn;
					bool to=c.toCounter(cn);
					
					if(to){
						bool dq = pq.dequeue();
						if(dq){
							cout << "Please proceed to Counter #" << cn << endl; 
						}
					}
					cout<<"DO YOU WANT TO CALL THE NEXT CUSTOMER( 1-YES, 0-NO ) :";
					cin>>control;
				}while(control==1);
		   }
		    else if(ch==5) // OPTION 5
		   {	
		   		system("CLS");

				pq.setpriority();
		   }
			else if(ch==6) // OPTION 6
		   {	
		   		system("CLS");

				system("CLS");
		   		int control=1;
				do{
					cout<<"\nENTER THE COUNTER # YOU WANT TO UPDATE : ";
					cin>>cn;
					
					if(c.findCounter(cn)){
						c.updateCounter(cn);
					}
					else{
						cout<<"COUNTER CANNOT BE FOUND! ENTER OTHER COUNTER #."<<endl;
					}
					
					cout<<"DO YOU WANT TO CONTINUE TO UPDATE MORE COUNTER( 1-YES, 0-NO ) : ";
					cin>>control;
				}while(control==1);
		   }
		   else if(ch==7) // OPTION 7
		   {
   				system("CLS");
				pq.displayList();	
	       }
	       else if(ch==8) // OPTION 8
		   {
				string ic="";
   				system("CLS");
   				cout << "Please Enter your IC: ";
   				cin >> ic;
				pq.search(ic);
	       }
		   else if(ch==9) // OPTION 9
		   {
		   		system("CLS");
				cout<<"Thank you for using our system, see you next time"<<endl;
				getch();
				system("CLS");
				goto mainmenu;
		   }
		   else // INVALID OPTION
		   {
		   	system("CLS");
		   	cout<<"Invalid choice"<<endl;
		   }
		   
			cout << endl << "Press any key to continue..." ;
		    getch();
		   goto adm;		
					}
					else{
						cout << "\nLogin failed!";
						goto admin;
					}
   }
   else if(choice==2) //CUSTOMER SIGN IN PAGE
   {
   		customer:
   		system("CLS");
   		cout<<"========================================================\n"
			<<"=  	     VACCINE QUEUE SIMULATION SYSTEM           =\n"
			<<"=   		        (Customer)                     =\n"
			<<"========================================================\n";
		cout<<"=                  (1) Create account                  ="<<endl;
		cout<<"=                  (2) Login                           ="<<endl;
		cout<<"=                  (3) Exit                            ="<<endl;
		cout<<"========================================================"<<endl;
		cout<<"Enter your choice :"<<endl;
		cin>>ch;
				
		if(ch==1) //OPTION 1
	   {
		   	system("CLS");
	   		//register
	   		cout << "CREATE YOUR ACCOUNT" << endl;
	   		cout << "-------------------" << endl;
			cout << "\nEnter your ic number: ";
			cin >> newUser.ic;
	   		cout << "\nEnter your desired passsword: ";
	   		cin >> newUser.password;
	   		
	   		cout << "\n\nSuccessfully Create your Account!. Please Login." << endl;
	   		cout << "====================================================" << endl << endl;
		   		
	   		goto logincustomer;
		   }
		   else if(ch==2) // OPTION 2
		   {
		   		system("CLS");
		   		goto logincustomer;
		   }
		   else{
		   		exit(0);
		   }
		   
		   	logincustomer: 
		  	Login newLogin;
		   	cout << "IC: ";
		   	cin >> newLogin.inputIC;
		   	cout << "Password: ";
		   	cin >> newLogin.inputPass;
		   		
		   	if(newLogin.inputIC == newUser.ic && newLogin.inputPass == newUser.password){
		   		cout << "\nSuccessfully Login!";
				 goto cust;		
			}
			else{
				cout << "\nLogin failed!";
				goto customer;
			}
   }	
	else if(choice==3)
	{
		system("CLS");
		cout<<"Thank you for using our system, see you next time"<<endl;
		return 0;
	}
	else
	{
   		cout<<"Invalid choice"<<endl;
   		cout << endl << "Press any key to continue..." ;
   		getch();
   		goto mainmenu;
	}
	
   /*Customer Menu*/
   cust:
   system("CLS");
   cout<<"========================================================\n"
	   <<"=    Welcome to our VACCINE QUEUE SIMULATION SYSTEM    =\n"
	   <<"========================================================\n";
   cout<<"=                  (1) Register                        ="<<endl;
   cout<<"=                  (2) Cancel                          ="<<endl;
   cout<<"=                  (3) Display                         ="<<endl;
   cout<<"=                  (4) Exit                            ="<<endl;
   cout<<"========================================================"<<endl;
   cout<<"Enter your choice :"<<endl;
   cin>>ch;
   
   if(ch==1)			//If ch which is customer choice is 1, customer will go to cEnqueue operation
   {
   	system("CLS");
   	pq.cEnqueue();
   }
   else if(ch==2)		//Option 2-Cancel required customer enter the ic before go to remove to cancel the registration
   {
   	string ic="";
   	system("CLS");
   	cout << "Please Enter your IC: ";
   	cin >> ic;
	pq.remove(ic);
   }
   else if(ch==3)		//Option 3-Display required customer enter the ic to display the corresponding details
   {
   	string ic="";
   	system("CLS");
   	cout << "Please Enter your IC: ";
   	cin >> ic;
	pq.display(ic);
   }
   else if(ch==4)		//Customer will be redirect to main menu if enter 4-Exit
   {
   	system("CLS");
	cout<<"Thank you for using our system, see you next time"<<endl;
	getch();
	system("CLS");
	goto mainmenu;
   }
   else					//Invalid choice message will be come out if customer enter wrong option number
   {
   	system("CLS");
   	cout<<"Invalid choice"<<endl;
   	goto cust;
   }
   
	cout << endl << "Press any key to continue..." ;	
    getch();
	goto cust;			//Bring customer to customer menu
	

return 0;
}