/*
 * 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.Typeface;
import android.support.v4.content.ContextCompat;
import android.support.v7.widget.AppCompatCheckBox;
import android.util.TypedValue;
import android.view.inputmethod.InputMethodManager;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.LinearLayout;

import org.javarosa.core.model.SelectChoice;
import org.javarosa.core.model.data.IAnswerData;
import org.javarosa.core.model.data.SelectMultiData;
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.R;
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;

/**
 * SelctMultiWidget handles multiple selection fields using checkboxes.
 *
 * @author Carl Hartung (carlhartung@gmail.com)
 * @author Yaw Anokwa (yanokwa@gmail.com)
 */
public class SelectMultiWidget extends QuestionWidget {
  private boolean mCheckboxInit = true;
  Vector<SelectChoice> mItems;

  private ArrayList<CheckBox> mCheckboxes;


  @SuppressWarnings("unchecked")
  public SelectMultiWidget(Context context, FormEntryPrompt prompt) {
    super(context, prompt);
    mPrompt = prompt;
    mCheckboxes = new ArrayList<>();

    // 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();
    }

    setOrientation(LinearLayout.VERTICAL);

    Vector<Selection> ve = new Vector<>();
    if (prompt.getAnswerValue() != null) {
      ve = (Vector<Selection>) prompt.getAnswerValue().getValue();
    }

    if (mItems != null) {
      for (int i = 0; i < mItems.size(); i++) {
        // no checkbox group so id by answer + offset
        AppCompatCheckBox c = new AppCompatCheckBox(getContext());
        c.setTag(i);
        c.setId(QuestionWidget.newUniqueId());
        c.setText(prompt.getSelectChoiceText(mItems.get(i)));
        c.setTextSize(TypedValue.COMPLEX_UNIT_PX, getResources().getDimension(R.dimen.answer_text));
        c.setFocusable(!prompt.isReadOnly());
        c.setEnabled(!prompt.isReadOnly());
        c.setTypeface(null, Typeface.NORMAL);
        c.setTextColor(ContextCompat.getColor(context, R.color.primary_text));

        for (int vi = 0; vi < ve.size(); vi++) {
          // match based on value, not key
          if (mItems.get(i).getValue().equals(ve.elementAt(vi).getValue())) {
            c.setChecked(true);
            break;
          }

        }
        mCheckboxes.add(c);
        // when clicked, check for readonly before toggling
        c.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
          @Override
          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (!mCheckboxInit && mPrompt.isReadOnly()) {
              if (buttonView.isChecked()) {
                buttonView.setChecked(false);
                Collect.getInstance().getActivityLogger().logInstanceAction(this, "onItemClick.deselect",
                    mItems.get((Integer) buttonView.getTag()).getValue(), mPrompt.getIndex());
              } else {
                buttonView.setChecked(true);
                Collect.getInstance().getActivityLogger().logInstanceAction(this, "onItemClick.select",
                    mItems.get((Integer) buttonView.getTag()).getValue(), mPrompt.getIndex());
              }
            }
          }
        });

        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), c, audioURI, imageURI, videoURI, bigImageURI);
        addView(mediaLayout);
      }
    }

    mCheckboxInit = false;

  }


  @Override
  public void clearAnswer() {
    for (CheckBox c : mCheckboxes) {
      if (c.isChecked()) {
        c.setChecked(false);
      }
    }
  }


  @Override
  public IAnswerData getAnswer() {
    Vector<Selection> vc = new Vector<>();
    for (int i = 0; i < mCheckboxes.size(); ++i) {
      CheckBox c = mCheckboxes.get(i);
      if (c.isChecked()) {
        vc.add(new Selection(mItems.get(i)));
      }
    }

    if (vc.size() == 0) {
      return null;
    } else {
      return new SelectMultiData(vc);
    }

  }


  @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 void setOnLongClickListener(OnLongClickListener l) {
    for (CheckBox c : mCheckboxes) {
      c.setOnLongClickListener(l);
    }
  }


  @Override
  public void cancelLongPress() {
    super.cancelLongPress();
    for (CheckBox c : mCheckboxes) {
      c.cancelLongPress();
    }
  }

}
