package application;

import java.util.ArrayList;

import javafx.application.Application;

import javafx.geometry.Pos;

import javafx.stage.Stage;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.control.TextField;

import javafx.scene.input.MouseEvent;

import javafx.scene.layout.BorderPane;

import javafx.scene.layout.GridPane;

import javafx.scene.layout.HBox;

import javafx.scene.text.Text;

public class Main extends Application {

private double width = 700;

private double height = 600;

ArrayList<Person> personList = new ArrayList<Person>();

ArrayList<Person> payPerson = new ArrayList<Person>();

ArrayList<Person> receivePerson = new ArrayList<Person>();

public Scene solutionPage(Stage stage) {

double transferAmount = 0.0;

for(int i = 0 ; i<payPerson.size() ; i++) {

payPerson.get(i).balance = MainActivity.average - payPerson.get(i).totalPaid;

System.out.println("pay: " + payPerson.get(i).name + " balance " + payPerson.get(i).balance);

}

for(int i = 0 ; i<receivePerson.size() ; i++) {

receivePerson.get(i).balance = receivePerson.get(i).totalPaid - MainActivity.average;

System.out.println("receive: " + receivePerson.get(i).name + " balance " + receivePerson.get(i).balance);

transferAmount += receivePerson.get(i).balance;

}

System.out.println(transferAmount);

ArrayList<Text> solution = new ArrayList<Text>();

int i = 0;

int j = 0;

while(transferAmount>0) {

if(payPerson.get(i).balance == receivePerson.get(j).balance) {

Text t = new Text(payPerson.get(i).name + " need to pay " + receivePerson.get(j).name + " RM" + receivePerson.get(j).balance);

solution.add(t);

transferAmount -= receivePerson.get(j).balance;

i++;

j++;

}

else if(payPerson.get(i).balance > receivePerson.get(j).balance) {

Text t = new Text(payPerson.get(i).name + " need to pay " + receivePerson.get(j).name + " RM" + receivePerson.get(j).balance);

payPerson.get(i).balance -= receivePerson.get(j).balance;

System.out.println(payPerson.get(i).balance);

transferAmount -= receivePerson.get(j).balance;

solution.add(t);

j++;

}

else if(payPerson.get(i).balance < receivePerson.get(j).balance) {

Text t = new Text(payPerson.get(i).name + " need to pay " + receivePerson.get(j).name + " RM" + payPerson.get(j).balance);

receivePerson.get(i).balance -= payPerson.get(j).balance;

transferAmount -= payPerson.get(j).balance;

solution.add(t);

i++;

}

}

GridPane grid = new GridPane();

for(int k = 0 ; k< solution.size() ; k++) {

grid.add(solution.get(k), 0, k);

}

BorderPane pane = new BorderPane();

pane.setCenter(grid);

Scene scene = new Scene(pane, width, height);

return scene;

}

public Scene totalSpentPage(Stage stage) {

HBox header = new HBox();

GridPane grid = new GridPane();

ArrayList<TextField> field = new ArrayList<TextField>();

for(int i = 0 ; i<personList.size() ; i++) {

Text label = new Text("How much " + personList.get(i).name + " pay: ");

TextField fields = new TextField();

field.add(fields);

grid.add(label, 0, i);

grid.add(fields, 1, i);

}

Button submit = new Button("submit");

grid.add(submit, 1, personList.size());

submit.addEventHandler(MouseEvent.MOUSE_CLICKED, (e)->{

for(int i = 0 ; i<personList.size() ; i++) {

personList.get(i).totalPaid = Double.parseDouble(field.get(i).getText());

MainActivity.totalSpent += Double.parseDouble(field.get(i).getText());

}

MainActivity.average = MainActivity.totalSpent/MainActivity.peopleCount;

for(int i = 0 ; i<personList.size() ; i++) {

if(personList.get(i).totalPaid == MainActivity.average) {

continue;

}

else if(personList.get(i).totalPaid > MainActivity.average) {

receivePerson.add(personList.get(i));

}

else {

payPerson.add(personList.get(i));

}

}

for(int i = 0 ; i<payPerson.size() ; i++) {

System.out.println("pay: " + payPerson.get(i).name);

}

for(int i = 0 ; i<receivePerson.size() ; i++) {

System.out.println("receive" + receivePerson.get(i).name);

}

stage.setScene(solutionPage(stage));

});

BorderPane pane = new BorderPane();

pane.setTop(header);

pane.setCenter(grid);

Scene scene = new Scene(pane, width, height);

return scene;

}

public Scene addNamePage(Stage stage) {

HBox header = new HBox();

header.getChildren().add(new Text("Add name"));

GridPane grid = new GridPane();

ArrayList<TextField> field = new ArrayList<TextField>();

for(int i = 0 ; i<personList.size() ; i++) {

Text labelName = new Text("Name " + (i+1));

TextField nameField = new TextField();

field.add(nameField);

grid.add(labelName, 0, i);

grid.add(nameField, 1, i);

}

Button submit = new Button("submit");

grid.add(submit, 1, personList.size());

submit.addEventHandler(MouseEvent.MOUSE_CLICKED, (e)->{

for(int i = 0 ; i<personList.size() ; i++) {

personList.get(i).name = field.get(i).getText();

System.out.println(personList.get(i).name);

}

stage.setScene(totalSpentPage(stage));

});

BorderPane pane = new BorderPane();

pane.setTop(header);

pane.setCenter(grid);

Scene scene = new Scene(pane, width, height);

return scene;

}

public Scene mainPage(Stage stage) {

Text personText = new Text("How many people: ");

TextField numPersonField = new TextField();

Button submitButton = new Button("submit");

submitButton.addEventHandler(MouseEvent.MOUSE_CLICKED, (e)->{

MainActivity.peopleCount = Integer.parseInt(numPersonField.getText());

System.out.println(MainActivity.peopleCount);

for(int i = 0 ; i<MainActivity.peopleCount ; i++) {

Person p = new Person();

personList.add(p);

}

stage.setScene(addNamePage(stage));

});

HBox header = new HBox();

header.getChildren().add(new Text("Home"));

GridPane grid = new GridPane();

grid.setAlignment(Pos.CENTER);

grid.add(personText, 0, 0);

grid.add(numPersonField, 0, 1);

grid.add(submitButton, 0, 2);

BorderPane pane = new BorderPane();

pane.setTop(header);

pane.setCenter(grid);

Scene scene = new Scene(pane, width, height);

return scene;

}

@Override

public void start(Stage stage) {

stage.setScene(mainPage(stage));

stage.setTitle("bill calculator");

stage.show();

}

public static void main(String[] args) {

launch(args);

}

}