/*
 * 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.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TableLayout;
import android.widget.TextView;
import android.widget.Toast;

import org.javarosa.core.model.data.IAnswerData;
import org.javarosa.core.model.data.StringData;
import org.javarosa.form.api.FormEntryPrompt;
import org.odk.collect.android.R;
import org.odk.collect.android.activities.FormEntryActivity;
import org.odk.collect.android.application.Collect;
import org.odk.collect.android.views.ButtonBuilder;

/**
 * Widget that allows user to scan barcodes and add them to the form.
 *
 * @author Yaw Anokwa (yanokwa@gmail.com)
 */
public class BarcodeWidget extends QuestionWidget implements IBinaryWidget {
  private Button mGetBarcodeButton;
  private TextView mStringAnswer;

  public BarcodeWidget(Context context, FormEntryPrompt prompt) {
    super(context, prompt);
    setOrientation(LinearLayout.VERTICAL);

    TableLayout.LayoutParams params = new TableLayout.LayoutParams();
    params.setMargins(7, 5, 7, 5);

    // set button formatting
    final ButtonBuilder barcodeButtonBuilder = new ButtonBuilder(context);
    barcodeButtonBuilder.withParent(this);
    barcodeButtonBuilder.withTextResource(R.string.get_barcode);
    barcodeButtonBuilder.readOnly(prompt.isReadOnly());
    mGetBarcodeButton = barcodeButtonBuilder.build();
    mGetBarcodeButton.setLayoutParams(params);

    // launch barcode capture intent on click
    mGetBarcodeButton.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        Collect.getInstance()
            .getActivityLogger()
            .logInstanceAction(this, "recordBarcode", "click",
                mPrompt.getIndex());
        Intent i = new Intent("com.google.zxing.client.android.SCAN");
        try {
          Collect.getInstance().getFormController()
              .setIndexWaitingForData(mPrompt.getIndex());
          ((Activity) getContext()).startActivityForResult(i,
              FormEntryActivity.BARCODE_CAPTURE);
        } catch (ActivityNotFoundException e) {
          Toast.makeText(
              getContext(),
              getContext().getString(
                  R.string.barcode_scanner_error),
              Toast.LENGTH_SHORT).show();
          Collect.getInstance().getFormController()
              .setIndexWaitingForData(null);
        }
      }
    });

    // set text formatting
    mStringAnswer = new TextView(getContext());
    mStringAnswer.setId(QuestionWidget.newUniqueId());
    mStringAnswer.setTextSize(TypedValue.COMPLEX_UNIT_DIP, mAnswerFontSize);
    mStringAnswer.setGravity(Gravity.CENTER);

    String s = prompt.getAnswerText();
    if (s != null) {
      mGetBarcodeButton.setText(getContext().getString(
          R.string.replace_barcode));
      mStringAnswer.setText(s);
    }
    // finish complex layout
    addView(mGetBarcodeButton);
    addView(mStringAnswer);
  }

  @Override
  public void clearAnswer() {
    mStringAnswer.setText(null);
    mGetBarcodeButton.setText(getContext().getString(R.string.get_barcode));
  }

  @Override
  public IAnswerData getAnswer() {
    String s = mStringAnswer.getText().toString();
    if (s == null || s.equals("")) {
      return null;
    } else {
      return new StringData(s);
    }
  }

  /**
   * Allows answer to be set externally in {@Link FormEntryActivity}.
   */
  @Override
  public void setBinaryData(Object answer) {
    mStringAnswer.setText((String) answer);
    Collect.getInstance().getFormController().setIndexWaitingForData(null);
  }

  @Override
  public void setFocus(Context context) {
    // Hide the soft keyboard if it's showing.
    InputMethodManager inputManager = (InputMethodManager) context
        .getSystemService(Context.INPUT_METHOD_SERVICE);
    inputManager.hideSoftInputFromWindow(this.getWindowToken(), 0);
  }

  @Override
  public boolean isWaitingForBinaryData() {
    return mPrompt.getIndex().equals(
        Collect.getInstance().getFormController()
            .getIndexWaitingForData());
  }

  @Override
  public void cancelWaitingForBinaryData() {
    Collect.getInstance().getFormController().setIndexWaitingForData(null);
  }

  @Override
  public void setOnLongClickListener(OnLongClickListener l) {
    mStringAnswer.setOnLongClickListener(l);
    mGetBarcodeButton.setOnLongClickListener(l);
  }

  @Override
  public void cancelLongPress() {
    super.cancelLongPress();
    mGetBarcodeButton.cancelLongPress();
    mStringAnswer.cancelLongPress();
  }

}
