import javafx.application.Application;
import javafx.application.Platform;
import javafx.event.ActionEvent;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.scene.text.Text;
import javafx.stage.Stage;

import java.sql.*;

public class StudentTranscriptGUI extends Application {

    private static TextField studentIDField;
    private static TableView<CourseGrade> tableView;

    private static Text response;

    public void start(Stage primaryStage) {
        primaryStage.setTitle("Get a Transcript");

        Label studentIDLabel = new Label("Student ID:");

        tableView = new TableView<>();
        tableView.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);

        TableColumn<CourseGrade, String> course = new TableColumn<>("Course");
        TableColumn<CourseGrade, String> grade = new TableColumn<>("Grade");

        tableView.getColumns().add(course);
        tableView.getColumns().add(grade);
        tableView.setPrefWidth(300);

        //depreciated
        course.impl_setReorderable(false);
        grade.impl_setReorderable(false);

        course.setCellValueFactory(new PropertyValueFactory<>("course"));
        grade.setCellValueFactory(new PropertyValueFactory<>("grade"));

        studentIDField = new TextField();
        studentIDField.setPrefWidth(150);
        studentIDField.setMaxWidth(300);



        Button accept = new Button("Get Transcript");
        accept.setOnAction(this::processAcceptStudent);
        Button quit = new Button("Quit");
        quit.setOnAction(this::quitApp);

        response = new Text("");

        GridPane grid = new GridPane();
        grid.setHgap(10);
        grid.setVgap(10);
        grid.setPadding(new Insets(0, 10, 0, 10));
        GridPane.setHalignment(quit, HPos.RIGHT);

        // Row 1: Buttons
        grid.add(accept, 0, 0);
        grid.add(quit, 2, 0);
        //Row 2: name
        grid.add(studentIDLabel, 0, 1);
        grid.add(studentIDField, 2, 1);
        //Row 3: tableView
        grid.add(tableView, 0, 2, 3, 1);
        //Row 4: response
        grid.add(response, 0, 3, 3, 4);


        Scene scene = new Scene(grid, 300, 300);

        primaryStage.setScene(scene);
        primaryStage.show();
    }


    public void processAcceptStudent(ActionEvent event) {

        Connection connection = openConnection();
        String studentID = studentIDField.getText();
        tableView.getItems().clear();
        try {
            String query = "{CALL studentTranscript(?)}";
            CallableStatement statement = connection.prepareCall(query);
            statement.setString(1, studentID);
            ResultSet rs = statement.executeQuery();
            while(rs.next()) {
                tableView.getItems().add(new CourseGrade(rs.getString(1), rs.getString(2)));
            }
            response.setText("Student transcript request completed.");
            response.setFill(Color.GREEN);
        } catch (SQLException sqlException) {
            response.setFill(Color.RED);
            response.setText(sqlException.getMessage());
        }
        closeConnection(connection);
    }

    @SuppressWarnings("SpellCheckingInspection")
    private static Connection openConnection() {
        final String url =  "jdbc:mysql://cs1103.cs.unb.ca:3306/ishoebot";
        final String user = "ishoebot";
        final String password = "k7FOLH5B";
        Connection conn = null;
        try {
            conn = DriverManager.getConnection(url, user, password);
        }
        catch (Exception exception) {
            response.setFill(Color.RED);
            response.setText("Couldn't open a connection: " + exception.getMessage());
        }
        return conn;
    }

    private static void closeConnection(Connection conn) {
        try {
            conn.close();
        }
        catch (Exception exception) {
            response.setFill(Color.RED);
            response.setText("Couldn't close a connection: " + exception.getMessage());
        }
    }

    public void quitApp(ActionEvent event) {
        Platform.exit();
        System.exit(0);
    }

    @SuppressWarnings("unused")
    public static class CourseGrade {
        private String course;
        private String grade;

        public CourseGrade(String course, String grade) {
            this.course = course;
            this.grade = grade;
        }
        public void setCourse(String course) {
            this.course = course;
        }
        public String getCourse() {
            return course;
        }
        public String getGrade() {
            return grade;
        }
        public void setGrade(String grade) {
            this.grade = grade;
        }
    }

}