package java6310.lesson01;

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class test extends Application {

    private TextField inputField;
    private ComboBox<String> fromBaseComboBox;
    private ComboBox<String> toBaseComboBox;
    private TextField outputField;
    private Button convertButton;

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("进制转换工具");

        Label inputLabel = new Label("输入数值：");
        inputField = new TextField();

        Label fromBaseLabel = new Label("原进制：");
        fromBaseComboBox = new ComboBox<>(FXCollections.observableArrayList("2", "8", "10", "16"));
        fromBaseComboBox.getSelectionModel().selectFirst();

        Label toBaseLabel = new Label("目标进制：");
        toBaseComboBox = new ComboBox<>(FXCollections.observableArrayList("2", "8", "10", "16"));
        toBaseComboBox.getSelectionModel().selectFirst();

        convertButton = new Button("转换");
        convertButton.setOnAction(event -> {
            convert();
        });

        Label outputLabel = new Label("转换结果：");
        outputField = new TextField();
        outputField.setEditable(false);

        VBox layout = new VBox(10);
        layout.setPadding(new Insets(10));
        layout.getChildren().addAll(inputLabel, inputField, fromBaseLabel, fromBaseComboBox, toBaseLabel, toBaseComboBox, convertButton, outputLabel, outputField);

        Scene scene = new Scene(layout, 300, 250);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void convert() {
        String inputValue = inputField.getText();
        int fromBase = Integer.parseInt(fromBaseComboBox.getValue());
        int toBase = Integer.parseInt(toBaseComboBox.getValue());

        int decimalValue = convertToDecimal(inputValue, fromBase);
        String result = convertFromDecimal(decimalValue, toBase);

        outputField.setText(result);
    }

    private int convertToDecimal(String value, int base) {
        int decimalValue = 0;
        int power = 0;
        for (int i = value.length() - 1; i >= 0; i--) {
            char digit = value.charAt(i);
            int digitValue;
            if (digit >= '0' && digit <= '9') {
                digitValue = digit - '0';
            } else if (digit >= 'A' && digit <= 'F') {
                digitValue = digit - 'A' + 10;
            } else {
                return 0;
            }
            decimalValue += digitValue * Math.pow(base, power);
            power++;
        }
        return decimalValue;
    }

    private String convertFromDecimal(int decimalValue, int base) {
        if (decimalValue == 0) {
            return "0";
        }
        StringBuilder result = new StringBuilder();
        while (decimalValue > 0) {
            int remainder = decimalValue % base;
            char digit;
            if (remainder < 10) {
                digit = (char) ('0' + remainder);
            } else {
                digit = (char) ('A' + remainder - 10);
            }
            result.insert(0, digit);
            decimalValue /= base;
        }
        return result.toString();
    }

    public static void main(String[] args) {
        launch(args);
    }
}