package de.uniluebeck.mi.projmi6.view;

import javafx.beans.binding.Bindings;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.IntegerPropertyBase;
import javafx.collections.FXCollections;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Node;
import javafx.scene.control.*;
import javafx.scene.effect.DropShadow;
import javafx.scene.effect.Effect;
import javafx.scene.layout.*;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;

import java.time.LocalDate;
import java.time.LocalTime;
import java.util.Arrays;
import java.util.stream.IntStream;
import java.time.LocalDateTime;
/**
 * A picker for date and time, composed from a DatePicker and two ComboBoxes. It also has an optional Button to set
 * date and time to the current system time.
 *
 * @author Johannes Oehm
 */
public class DateTimePicker extends HBox {
    private DatePicker datePicker = new DatePicker();
    private NumberTextField hourText = new NumberTextField();
    private NumberTextField minuteText = new NumberTextField();
    private Button btnNow = new Button("Jetzt");

    private Effect invalidValue = new DropShadow(10, Color.RED);


    /**
     * Empty constructor for the FXMLLoader.
     */
    public DateTimePicker(){
        this.setAlignment(Pos.CENTER_LEFT);
        hourText.setOnKeyReleased(event ->{
            if(hourText.getCaretPosition()>=2){
                int hour = Integer.parseInt(hourText.getText());
                if(hour>=0 && hour <= 24){
                    minuteText.requestFocus();
                }
            }
        });
        hourText.setAlignment(Pos.CENTER_RIGHT);
        hourText.setBackground(null);
        hourText.setPadding(Insets.EMPTY);
        hourText.setPromptText("HH");
        HBox.setHgrow(hourText, Priority.ALWAYS);
        minuteText.setBackground(null);
        minuteText.setPadding(Insets.EMPTY);
        minuteText.setPromptText("MM");
        HBox.setHgrow(minuteText, Priority.ALWAYS);

       hourText.effectProperty().bind(Bindings.<Effect>createObjectBinding(()->{
            String text = hourText.getText();
            if(text.isEmpty()){
                return null;
            }

            int value = Integer.parseInt(text);
            if(value>=0&&value<24){
                return null;
            }
            return invalidValue;
        }, hourText.textProperty()));

        minuteText.effectProperty().bind(Bindings.<Effect>createObjectBinding(()->{
            String text = minuteText.getText();
            if(text.isEmpty()){
                return null;
            }

            int value = Integer.parseInt(text);
            if(value>=0&&value<59){
                return null;
            }
            return invalidValue;
        }, minuteText.textProperty()));
        Label colon = new Label(":");

        HBox timePicker = new HBox(hourText, colon,minuteText);
        timePicker.maxHeightProperty().bind(datePicker.heightProperty());
        timePicker.setMinWidth(55);
        timePicker.setMaxWidth(70);
        timePicker.getStyleClass().add("button");

        //Set Now-Button action
        btnNow.setOnAction(event -> setToCurrentDateTime());
        //Make it large enough to read the text
        btnNow.setMinWidth(50);
        btnNow.getStyleClass().add("now-button");

        //Add the subcomponents to the view.
        this.getChildren().addAll(datePicker,timePicker,btnNow);


        this.setSpacing(5);
    }




    /**
     * Setter for the DateTime that is set in the view.
     * @param localDateTime The date to be set in the view.
     */
    public void setDateTime(LocalDateTime localDateTime){
        if(localDateTime==null){
            hourText.setText("");
            minuteText.setText("");
            datePicker.setValue(null);
        }else{
            hourText.setText(Integer.toString(localDateTime.getHour()));
            minuteText.setText(Integer.toString(localDateTime.getMinute()));
            datePicker.setValue(LocalDate.from(localDateTime));
        }
    }

    /**
     * Sets the date set in the view to the current systems time.
     */
    public void setToCurrentDateTime(){
        setDateTime(LocalDateTime.now());
    }


    /**
     * Getter for date and time that is currently set in the view.
     * @return A LocalDateTime object or null, if one or more fields are not set.
     */
    public LocalDateTime getDateTime(){
        if(datePicker.getValue()==null ){
            return  null;
        }
        try{
            int hour = Integer.parseInt( hourText.getText());
            int minute = Integer.parseInt(minuteText.getText());
            if(hour>=24|| hour<0||minute<0||minute>=60){
                return null;
            }
            return LocalDateTime.of(datePicker.getValue(), LocalTime.of(hour, minute));
        }catch (Exception e){
            return  null;
        }
    }

    /**
     * A property for hiding the "Set date and time to now"-Button.
     * @return A BooleanProperty, true if the button is visible.
     */
    public BooleanProperty nowButtonVisiblePropety(){
        return btnNow.visibleProperty();
    }

    /**
     * Setter for the {@link DateTimePicker#nowButtonVisiblePropety}.
     * @param visible When set to true, the button will be shown.
     */
    public void setNowButtonVisible(boolean visible){
        btnNow.setVisible(visible);
    }

    /**
     * Getter for the {@link DateTimePicker#nowButtonVisiblePropety}.
     * @return true if the now-Button is visible, false otherwise.
     */
    public boolean isNowButtonVisible(){
        return btnNow.isVisible();
    }


}