package com.test;

import android.content.Context;
import android.text.Editable;
import android.text.InputFilter;
import android.text.InputType;
import android.text.TextWatcher;
import android.text.method.NumberKeyListener;
import android.util.AttributeSet;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.Toast;

public class CustomEditText extends EditText {

    private int lengthOld = 0;

    public CustomEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initialize();
    }

    public CustomEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        initialize();
    }

    public CustomEditText(Context context) {
        super(context);
        initialize();
    }

    public void initialize() {

        int maxLength = 8;
        InputFilter[] FilterArray = new InputFilter[1];
        FilterArray[0] = new InputFilter.LengthFilter(maxLength);
        this.setFilters(FilterArray);
        this.setKeyListener(keylistenerText);
        this.addTextChangedListener(new TextWatcher()
        {
                public void  afterTextChanged (Editable s)
                {
                    String textCurrent = s.toString();
                    int lengthNew = textCurrent.length();

                    // erasing...
                    if (lengthOld > lengthNew) {
                        if (lengthNew == 4) {
                            s.delete(3, 4);
                            lengthNew--;
                        }
                    // typing...
                    } else{
                        if (lengthNew < 3) {
                            String textCurrentUp = textCurrent.toUpperCase();
                            if (!textCurrentUp.equals(textCurrent)) {
                                // uppercase
                                CustomEditText.this.setText(textCurrentUp);
                                CustomEditText.this.setSelection(lengthNew);
                            }
                        } else if (lengthNew == 3 || (lengthNew == 4 && textCurrent.charAt(3) != '-')) {
                            // inserts the dash and switches to numerical
                            Toast.makeText(CustomEditText.this.getContext(), "Now enter only numbers", Toast.LENGTH_SHORT).show();
                            CustomEditText.this.setInputType(InputType.TYPE_CLASS_TEXT);
                            s.insert(3, "-");
                            lengthNew++;
                            CustomEditText.this.setSelection(lengthNew);
                        } else if (lengthNew >= 8) {
                            // remove the keyboard
                            InputMethodManager imm = (InputMethodManager) CustomEditText.this.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
                            imm.hideSoftInputFromWindow(CustomEditText.this.getWindowToken(), 0);
                        }
                    }
                    // change the type of character
                    if (lengthNew > 3) {
                        CustomEditText.this.setKeyListener(keylistenerNumber);
                    } else {
                        CustomEditText.this.setKeyListener(keylistenerText);
                    }
                    lengthOld = lengthNew;
                }

                public void  beforeTextChanged  (CharSequence s, int start, int count, int after)
                {
                }

                public void  onTextChanged  (CharSequence s, int start, int before, int count)
                {
                }
        });
    }

    private final KeylistenerNumber keylistenerNumber = new KeylistenerNumber();
    private final KeylistenerText keylistenerText = new KeylistenerText();

    private class KeylistenerNumber extends NumberKeyListener {

        public int getInputType() {
          return InputType.TYPE_CLASS_NUMBER | InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS;
        }

        @Override
        protected char[] getAcceptedChars() {
          return new char[] {'0','1','2','3','4','5','6','7','8','9'};
        }
    }

    private class KeylistenerText extends NumberKeyListener {

        public int getInputType() {
            return InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_FLAG_CAP_CHARACTERS | InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS;
        }

        @Override
        protected char[] getAcceptedChars() {
            return new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
                    'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c',
                    'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
                    't', 'u', 'v', 'w', 'x', 'y', 'z' };
        }
    }

}