/*
 * Copyright (C) 2009 University of Washington
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package org.odk.collect.android.widgets;

import android.content.Context;
import android.text.InputFilter;
import android.text.InputType;
import android.text.method.DigitsKeyListener;

import org.javarosa.core.model.data.DecimalData;
import org.javarosa.core.model.data.IAnswerData;
import org.javarosa.form.api.FormEntryPrompt;

import java.text.NumberFormat;

/**
 * A widget that restricts values to floating point numbers.
 *
 * @author Carl Hartung (carlhartung@gmail.com)
 */
public class DecimalWidget extends StringWidget {

  private Double getDoubleAnswerValue() {
    IAnswerData dataHolder = mPrompt.getAnswerValue();
    Double d = null;
    if (dataHolder != null) {
      Object dataValue = dataHolder.getValue();
      if (dataValue != null) {
        if (dataValue instanceof Integer) {
          d = Double.valueOf(((Integer) dataValue).intValue());
        } else {
          d = (Double) dataValue;
        }
      }
    }
    return d;
  }

  public DecimalWidget(Context context, FormEntryPrompt prompt, boolean readOnlyOverride) {
    super(context, prompt, readOnlyOverride, true);

    // formatting
    mAnswer.setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL);

    // needed to make long readonly text scroll
    mAnswer.setHorizontallyScrolling(false);
    mAnswer.setSingleLine(false);

    // only numbers are allowed
    mAnswer.setKeyListener(new DigitsKeyListener(true, true));

    // only 15 characters allowed
    InputFilter[] fa = new InputFilter[1];
    fa[0] = new InputFilter.LengthFilter(15);
    mAnswer.setFilters(fa);

    Double d = getDoubleAnswerValue();

    NumberFormat nf = NumberFormat.getNumberInstance();
    nf.setMaximumFractionDigits(15);
    nf.setMaximumIntegerDigits(15);
    nf.setGroupingUsed(false);
    if (d != null) {
      // truncate to 15 digits max...
      String dString = nf.format(d);
      d = Double.parseDouble(dString.replace(',', '.'));
      mAnswer.setText(d.toString());
    }

    // disable if read only
    if (prompt.isReadOnly()) {
      setBackgroundDrawable(null);
      setFocusable(false);
      setClickable(false);
    }

    setupChangeListener();
  }


  @Override
  public IAnswerData getAnswer() {
    clearFocus();
    String s = mAnswer.getText().toString();
    if (s == null || s.equals("")) {
      return null;
    } else {
      try {
        return new DecimalData(Double.valueOf(s).doubleValue());
      } catch (Exception NumberFormatException) {
        return null;
      }
    }
  }

}
