package de.hhn.it.pp.javafx.controllers;

import java.io.IOException;
import java.net.URL;
import java.time.LocalDate;
import java.time.ZoneId;
import java.util.Date;
import java.util.EventObject;
import java.util.List;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import de.hhn.it.pp.components.lgs.LinearSystem;
import de.hhn.it.pp.components.reminder.IdGenerator;
import de.hhn.it.pp.components.reminder.Priority;
import de.hhn.it.pp.components.reminder.ReminderImpl;
import de.hhn.it.pp.components.reminder.Task;
import de.hhn.it.pp.javafx.Main;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.DatePicker;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
//import models.TaskModel;
import javafx.scene.Node;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ReminderMainController implements Initializable {

    public ObservableList<Task> listTaskData = FXCollections.observableArrayList();

    @FXML
    private Button btnDelete;

    @FXML
    private Button btnEdit;

    @FXML
    public ListView<Task> viewTaskList;

    @FXML
    private Label lbReminder;

    @FXML
    private Button btnNewTask;

    @FXML
    private Label lbDescription;

    @FXML
    private Label lbDeadline;

    @FXML
    private DatePicker pickerDeadline;

    @FXML
    private TextField fldDescription;

    @FXML
    private ComboBox<Priority> ddPriority;

    @FXML
    private Label lbPriority;

    @FXML
    private Label lbTitle;

    @FXML
    private Button btnCancel;

    @FXML
    private DatePicker pickerReminderDate;

    @FXML
    private Button btnSave;

    @FXML
    private Label lbReminderDate;

    @FXML
    private TextField fldTitle;

    @FXML
    private BorderPane BorderPaneCreationWindow;

    public Main main;

    private ReminderImpl reminder = new ReminderImpl();

    public Stage prevStage;

    private boolean isMainView;

    private static final Logger logger = LoggerFactory.getLogger(ReminderMainController.class);

    public void setPrevStage(Stage stage) {
        this.prevStage = stage;
    }

    @FXML
    // btnNewTask.setOnAction(new EventHandler<ActionEvent>() {
    // scene.addEventFilter(MouseEvent.MOUSE_PRESSED, new EventHandler<MouseEvent>()
    // {
    // @Overrite
    public void btnNewTaskClicked(ActionEvent event) throws IOException {

        try {
            isMainView=false;

            Node node = (Node) event.getSource();
            Stage stage = (Stage) node.getScene().getWindow();

            Parent root = FXMLLoader.load(getClass().getResource("/fxml/ReminderTaskCreationWindow.fxml"));

            // create a new scene with root and set the stage
            Scene scene = new Scene(root);
            stage.setScene(scene);
            // ddPriority = new ComboBox<>();
            // ddPriority.getItems().addAll(Priority.values());
            stage.show();
        } catch (IOException | RuntimeException e) {
            logger.error("Es ist ein Fehler beim Laden des zweiten Screens aufgetreten: ", e);
        }

    }

    @FXML
    public void btnEditClicked(ActionEvent event) {

        try {
            isMainView=false;

            Node node = (Node) event.getSource();
            Stage stage = (Stage) node.getScene().getWindow();

            Parent root = FXMLLoader.load(getClass().getResource("/fxml/ReminderTaskCreationWindow.fxml"));

            // create a new scene with root and set the stage
            Scene scene = new Scene(root);
            stage.setScene(scene);
            stage.show();
        } catch (IOException | RuntimeException e) {
            logger.error("Es ist ein Fehler beim Laden des zweiten Screens aufgetreten: ", e);
        }
    }

    @FXML
    void btnSaveClicked(ActionEvent event) {

        LocalDate localDate = pickerDeadline.getValue();
        Date deadline = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
        Date reminderDate = null;
        if (pickerReminderDate.getValue() != null) {
            localDate = pickerReminderDate.getValue();
            reminderDate = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
        }

        if (validateReminderDate(reminderDate, deadline)) {
            reminder.createTask(fldTitle.getText(), fldDescription.getText(), deadline, ddPriority.getValue(),
                    reminderDate);

            for (Task task : reminder.getAllTasks()) {
                listTaskData.add(task);
            }

            Date today = new Date();

            if (reminderDate != null) {

                if (reminderDate.compareTo(today) <= 0) {
                    logger.info("Reminder date is today / overdue");
                    Alert alert = new Alert(AlertType.INFORMATION);
                    alert.setTitle("Reminder");
                    alert.setHeaderText(null);
                    alert.setContentText("Don't forget " + fldTitle.getText() + " on " + deadline + "!");
                    alert.showAndWait();
                }
            }
            try {
                isMainView=true;

                Node node = (Node) event.getSource();
                Stage stage = (Stage) node.getScene().getWindow();

                Parent root = FXMLLoader.load(getClass().getResource("/fxml/ReminderMainWindow.fxml"));

                // create a new scene with root and set the stage
                Scene scene = new Scene(root);
                stage.setScene(scene);
                stage.show();

            } catch (IOException | RuntimeException e) {
                logger.error("Es ist ein Fehler beim Laden des ersten Screens aufgetreten: ", e);
            }

        }

    }

    public boolean validateReminderDate(Date reminderDate, Date deadline) {
        if (reminderDate != null) {

            if (reminderDate.after(deadline)) {
                Alert alert = new Alert(AlertType.ERROR);
                alert.setTitle("Cannot Save");
                alert.setHeaderText(null);
                alert.setContentText("Reminder Date can't be set after Deadline!");
                alert.showAndWait();
                return false;
            } else {
                return true;
            }
        }
        return true;
    }

    @FXML
    public void btnDeleteClicked() {
        try {
            isMainView=true;

            Integer taskId = viewTaskList.getSelectionModel().getSelectedItem().getId();
            logger.debug("Selected taskId: " + taskId);

            viewTaskList.getItems().remove(viewTaskList.getSelectionModel().getSelectedItem());
            viewTaskList.refresh();
        } catch (NullPointerException e) {
            logger.error("Exception @removeItem: " + e);
        }
    }

    @FXML
    void btnCancelClicked(ActionEvent event) {
        try {
            isMainView=true;

            Node node = (Node) event.getSource();
            Stage stage = (Stage) node.getScene().getWindow();

            Parent root = FXMLLoader.load(getClass().getResource("/fxml/ReminderMainWindow.fxml"));

            // create a new scene with root and set the stage
            Scene scene = new Scene(root);
            stage.setScene(scene);
            stage.show();
        } catch (IOException | RuntimeException e) {
            logger.error("Es ist ein Fehler beim Laden des ersten Screens aufgetreten: ", e);
        }
    }

    public void setMain(Main main) {
        this.main = main;
    }

    @Override
    public void initialize(URL arg0, ResourceBundle arg1) {
//      if(viewTaskList != null) {
//          viewTaskList.setItems(this.listTaskData);
//      // if (viewTaskList == null) {
//      // createDummyData("Arzttermin");
//      // }
//      }
    }

    // public void createDummyData(String title) {
    //// reminder.createTask(title, null, new Date(), null, null);
    //// for (Task task : reminder.getAllTasks()) {
    //// listTaskData.add(task);
    //// }
    ////
    //// // either uncomment next if cond. OR write proper method call (check main
    //// // screen...)
    //// if (viewTaskList != null) {
    //// viewTaskList.setItems(listTaskData);
    //// }
    // }

}