// WriteToFile Example
// Source code file: ActivityMain.java
// Write to a file in Internal Storage.
// Write string in EditText widget to file.
// Then read from file and display it in a TextView widget.

package it372.smiths.writetofile;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class MainActivity extends AppCompatActivity {
    private EditText edtxtInput;
    private TextView txtDisplay;
    private String demoFile = "demofile.txt";
    private File file;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        edtxtInput = findViewById(R.id.edt_input);
        txtDisplay = findViewById(R.id.txt_display);
        file = new File(getFilesDir( ), demoFile);
    }

    public void onClickWrite(View view) {
        try {
            FileWriter fw = new FileWriter(file, true);
            BufferedWriter bw = new BufferedWriter(fw);
            String data = edtxtInput.getText( ).toString( );
            bw.write(data + "\n");
            bw.close( );
            fw.close( );
        }
        catch (IOException e) {
            txtDisplay.setText("Could not write to file.");
            return;
        }
    }

    public void onClickRead(View view) {

        String line, output = "";
        Scanner scanner = null;
        try {
            scanner = new Scanner(file);
        }
        catch (FileNotFoundException e) {
            txtDisplay.setText("Could not read from file.");
            return;
        }
        while (scanner.hasNextLine( )) {
            output += scanner.nextLine( ) + "\n";
        }
        scanner.close( );
        txtDisplay.setText(output);
    }

    public void onClickDelete(View view) {
        boolean result = file.delete( );
        if (result) {
            txtDisplay.setText("File deleted.");
        }
        else {
            txtDisplay.setText("File not deleted.");
        }
    }
}