/*
 * 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.graphics.Color;
import android.util.TypedValue;
import android.view.inputmethod.InputMethodManager;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.LinearLayout;
import android.widget.RadioButton;

import org.javarosa.core.model.SelectChoice;
import org.javarosa.core.model.data.IAnswerData;
import org.javarosa.core.model.data.SelectOneData;
import org.javarosa.core.model.data.helper.Selection;
import org.javarosa.form.api.FormEntryCaption;
import org.javarosa.form.api.FormEntryPrompt;
import org.javarosa.xpath.expr.XPathFuncExpr;
import org.odk.collect.android.application.Collect;
import org.odk.collect.android.external.ExternalDataUtil;
import org.odk.collect.android.external.ExternalSelectChoice;
import org.odk.collect.android.views.MediaLayout;

import java.util.ArrayList;
import java.util.Vector;

/**
 * SelectOneWidgets handles select-one fields using radio buttons.
 *
 * @author Carl Hartung (carlhartung@gmail.com)
 * @author Yaw Anokwa (yanokwa@gmail.com)
 */
public class SelectOneWidget extends QuestionWidget implements
    OnCheckedChangeListener {

  Vector<SelectChoice> mItems; // may take a while to compute
  ArrayList<RadioButton> buttons;

  public SelectOneWidget(Context context, FormEntryPrompt prompt) {
    super(context, prompt);

    // SurveyCTO-added support for dynamic select content (from .csv files)
    XPathFuncExpr xPathFuncExpr = ExternalDataUtil.getSearchXPathExpression(prompt.getAppearanceHint());
    if (xPathFuncExpr != null) {
      mItems = ExternalDataUtil.populateExternalChoices(prompt, xPathFuncExpr);
    } else {
      mItems = prompt.getSelectChoices();
    }
    buttons = new ArrayList<RadioButton>();

    // Layout holds the vertical list of buttons
    LinearLayout buttonLayout = new LinearLayout(context);

    String s = null;
    if (prompt.getAnswerValue() != null) {
      s = ((Selection) prompt.getAnswerValue().getValue()).getValue();
    }

    if (mItems != null) {
      for (int i = 0; i < mItems.size(); i++) {
        RadioButton r = new RadioButton(getContext());
        r.setText(prompt.getSelectChoiceText(mItems.get(i)));
        r.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
        r.setTag(Integer.valueOf(i));
        r.setId(QuestionWidget.newUniqueId());
        r.setEnabled(!prompt.isReadOnly());
        r.setTextColor(Color.parseColor("#757575"));
        r.setFocusable(!prompt.isReadOnly());

        buttons.add(r);

        if (mItems.get(i).getValue().equals(s)) {
          r.setChecked(true);
        }

        r.setOnCheckedChangeListener(this);

        String audioURI = null;
        audioURI = prompt.getSpecialFormSelectChoiceText(mItems.get(i),
            FormEntryCaption.TEXT_FORM_AUDIO);

        String imageURI;
        if (mItems.get(i) instanceof ExternalSelectChoice) {
          imageURI = ((ExternalSelectChoice) mItems.get(i)).getImage();
        } else {
          imageURI = prompt.getSpecialFormSelectChoiceText(mItems.get(i), FormEntryCaption.TEXT_FORM_IMAGE);
        }

        String videoURI = null;
        videoURI = prompt.getSpecialFormSelectChoiceText(mItems.get(i),
            "video");

        String bigImageURI = null;
        bigImageURI = prompt.getSpecialFormSelectChoiceText(
            mItems.get(i), "big-image");

        MediaLayout mediaLayout = new MediaLayout(getContext());
        mediaLayout.setAVT(prompt.getIndex(), "." + Integer.toString(i), r, audioURI, imageURI,
            videoURI, bigImageURI);

        // if (i != mItems.size() - 1) {
        // // Last, add the dividing line (except for the last element)
        // ImageView divider = new ImageView(getContext());
        // divider.setBackgroundResource(android.R.drawable.divider_horizontal_bright);
        // mediaLayout.addDivider(divider);
        // }
        buttonLayout.addView(mediaLayout);
      }
    }
    buttonLayout.setOrientation(LinearLayout.VERTICAL);

    // The buttons take up the right half of the screen
    LayoutParams buttonParams = new LayoutParams(LayoutParams.FILL_PARENT,
        LayoutParams.WRAP_CONTENT);
    //buttonParams.bottomMargin = getResources().getDimensionPixelOffset(R.dimen.radio_group_bottom_margin);
    buttonParams.setMarginStart(4);
    addView(buttonLayout, buttonParams);
  }

  @Override
  public void clearAnswer() {
    for (RadioButton button : this.buttons) {
      if (button.isChecked()) {
        button.setChecked(false);
        return;
      }
    }
  }

  @Override
  public IAnswerData getAnswer() {
    int i = getCheckedId();
    if (i == -1) {
      return null;
    } else {
      SelectChoice sc = mItems.elementAt(i);
      return new SelectOneData(new Selection(sc));
    }
  }

  @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);
  }

  public int getCheckedId() {
    for (int i = 0; i < buttons.size(); ++i) {
      RadioButton button = buttons.get(i);
      if (button.isChecked()) {
        return i;
      }
    }
    return -1;
  }

  @Override
  public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    if (!isChecked) {
      // If it got unchecked, we don't care.
      return;
    }

    for (RadioButton button : buttons) {
      if (button.isChecked() && !(buttonView == button)) {
        button.setChecked(false);
      }
    }

    Collect.getInstance().getActivityLogger().logInstanceAction(this, "onCheckedChanged",
        mItems.get((Integer) buttonView.getTag()).getValue(), mPrompt.getIndex());
  }

  @Override
  public void setOnLongClickListener(OnLongClickListener l) {
    for (RadioButton r : buttons) {
      r.setOnLongClickListener(l);
    }
  }

  @Override
  public void cancelLongPress() {
    super.cancelLongPress();
    for (RadioButton button : this.buttons) {
      button.cancelLongPress();
    }
  }

}
