/*
 * 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.annotation.SuppressLint;
import android.content.Context;
import android.os.Build;
import android.support.v4.view.ViewCompat;
import android.view.Gravity;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.CalendarView;
import android.widget.DatePicker;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;

import org.javarosa.core.model.data.DateData;
import org.javarosa.core.model.data.IAnswerData;
import org.javarosa.form.api.FormEntryPrompt;
import org.joda.time.DateTime;
import org.odk.collect.android.application.Collect;
import org.odk.collect.android.views.ScrollableDatePicker;

import java.lang.reflect.Field;
import java.util.Calendar;
import java.util.Date;

/**
 * Displays a DatePicker widget. DateWidget handles leap years and does not allow dates that do not exist.
 *
 * @author Carl Hartung (carlhartung@gmail.com)
 * @author Yaw Anokwa (yanokwa@gmail.com)
 */
public class DateWidget extends QuestionWidget {

  private ScrollableDatePicker mDatePicker;
  private DatePicker.OnDateChangedListener mDateListener;
  private boolean hideDay = false;
  private boolean hideMonth = false;
  private boolean showCalendar = false;
  private HorizontalScrollView scrollView = null;


  @SuppressLint("NewApi")
  public DateWidget(Context context, FormEntryPrompt prompt) {
    super(context, prompt);

    mDatePicker = new ScrollableDatePicker(getContext());
    mDatePicker.setId(QuestionWidget.newUniqueId());
    mDatePicker.setFocusable(!prompt.isReadOnly());
    mDatePicker.setEnabled(!prompt.isReadOnly());

    hideDayFieldIfNotInFormat(prompt);

    mDateListener = new DatePicker.OnDateChangedListener() {
      @Override
      public void onDateChanged(DatePicker view, int year, int month, int day) {
        if (mPrompt.isReadOnly()) {
          setAnswer();
        } else {
          // TODO support dates <1900 >2100
          // handle leap years and number of days in month
          // http://code.google.com/p/android/issues/detail?id=2081
          Calendar c = Calendar.getInstance();
          c.set(year, month, 1);
          int max = c.getActualMaximum(Calendar.DAY_OF_MONTH);
          // in older versions of android (1.6ish) the datepicker lets you pick bad dates
          // in newer versions, calling updateDate() calls onDatechangedListener(), causing an
          // endless loop.
          if (day > max) {
            if (!(mDatePicker.getDayOfMonth() == day && mDatePicker.getMonth() == month && mDatePicker.getYear() ==
                year)) {
              Collect.getInstance().getActivityLogger().logInstanceAction(DateWidget.this, "onDateChanged", String
                  .format("%1$04d-%2$02d-%3$02d", year, month, max), mPrompt.getIndex());
              mDatePicker.updateDate(year, month, max);
            }
          } else {
            if (!(mDatePicker.getDayOfMonth() == day && mDatePicker.getMonth() == month && mDatePicker.getYear() ==
                year)) {
              Collect.getInstance().getActivityLogger().logInstanceAction(DateWidget.this, "onDateChanged", String
                  .format("%1$04d-%2$02d-%3$02d", year, month, day), mPrompt.getIndex());
              mDatePicker.updateDate(year, month, day);
            }
          }
        }
      }
    };

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
      mDatePicker.setImportantForAccessibility(ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS);
    }

    setGravity(Gravity.LEFT);
    if (showCalendar) {
      scrollView = new HorizontalScrollView(context);
      LinearLayout ll = new LinearLayout(context);
      ll.addView(mDatePicker);
      ll.setPadding(10, 10, 10, 10);
      scrollView.addView(ll);
      addView(scrollView);
    } else {
      addView(mDatePicker);
    }

    // If there's an answer, use it.
    setAnswer();
  }

  /**
   * Shared between DateWidget and DateTimeWidget. There are extra appearance settings that do not apply for dateTime...
   * TODO: move this into utilities or base class?
   *
   * @param prompt
   */
  @SuppressLint("NewApi")
  private void hideDayFieldIfNotInFormat(FormEntryPrompt prompt) {
    String appearance = prompt.getQuestion().getAppearanceAttr();
    if (appearance == null) {
      if (Build.VERSION.SDK_INT >= 11) {
        showCalendar = true;
        this.mDatePicker.setCalendarViewShown(true);
        if (Build.VERSION.SDK_INT >= 12 && Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {
          CalendarView cv = this.mDatePicker.getCalendarView();
          cv.setShowWeekNumber(false);
        }
        this.mDatePicker.setSpinnersShown(true);
        hideDay = true;
        hideMonth = false;
      } else {
        return;
      }
    } else if ("month-year".equals(appearance)) {
      hideDay = true;
      if (Build.VERSION.SDK_INT >= 11) {
        this.mDatePicker.setCalendarViewShown(false);
        this.mDatePicker.setSpinnersShown(true);
      }
    } else if ("year".equals(appearance)) {
      hideMonth = true;
      if (Build.VERSION.SDK_INT >= 11) {
        this.mDatePicker.setCalendarViewShown(false);
        this.mDatePicker.setSpinnersShown(true);
      }
    } else if ("no-calendar".equals(appearance)) {
      if (Build.VERSION.SDK_INT >= 11) {
        this.mDatePicker.setCalendarViewShown(false);
        this.mDatePicker.setSpinnersShown(true);
      }
    } else {
      if (Build.VERSION.SDK_INT >= 11) {
        showCalendar = true;
        this.mDatePicker.setCalendarViewShown(true);
        if (Build.VERSION.SDK_INT >= 12 && Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {
          CalendarView cv = this.mDatePicker.getCalendarView();
          cv.setShowWeekNumber(false);
        }
        this.mDatePicker.setSpinnersShown(true);
        hideDay = true;
        hideMonth = false;
      }
    }

    if (hideMonth || hideDay) {
      for (Field datePickerDialogField : this.mDatePicker.getClass().getDeclaredFields()) {
        if ("mDayPicker".equals(datePickerDialogField.getName()) || "mDaySpinner".equals(datePickerDialogField
            .getName())) {
          datePickerDialogField.setAccessible(true);
          Object dayPicker = new Object();
          try {
            dayPicker = datePickerDialogField.get(this.mDatePicker);
          } catch (Exception e) {
            e.printStackTrace();
          }
          ((View) dayPicker).setVisibility(View.GONE);
        }
        if (hideMonth) {
          if ("mMonthPicker".equals(datePickerDialogField.getName()) || "mMonthSpinner".equals(datePickerDialogField
              .getName())) {
            datePickerDialogField.setAccessible(true);
            Object monthPicker = new Object();
            try {
              monthPicker = datePickerDialogField.get(this.mDatePicker);
            } catch (Exception e) {
              e.printStackTrace();
            }
            ((View) monthPicker).setVisibility(View.GONE);
          }
        }
      }
    }
  }

  private void setAnswer() {

    if (mPrompt.getAnswerValue() != null) {
      DateTime ldt = new DateTime(((Date) ((DateData) mPrompt.getAnswerValue()).getValue()).getTime());
      mDatePicker.init(ldt.getYear(), ldt.getMonthOfYear() - 1, ldt.getDayOfMonth(), mDateListener);
    } else {
      // create date widget with current time as of right now
      clearAnswer();
    }
  }


  /**
   * Resets date to today.
   */
  @Override
  public void clearAnswer() {
    DateTime ldt = new DateTime();
    mDatePicker.init(ldt.getYear(), ldt.getMonthOfYear() - 1, ldt.getDayOfMonth(), mDateListener);
  }


  @Override
  public IAnswerData getAnswer() {
    if (showCalendar) {
      scrollView.clearChildFocus(mDatePicker);
    }
    clearFocus();
    DateTime ldt = new DateTime(mDatePicker.getYear(), (!showCalendar && hideMonth) ? 1 : mDatePicker.getMonth() + 1,
        (!showCalendar && (hideMonth || hideDay)) ? 1 : mDatePicker.getDayOfMonth(), 0, 0);
    // DateTime utc = ldt.withZone(DateTimeZone.forID("UTC"));
    return new DateData(ldt.toDate());
  }


  @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) {
    mDatePicker.setOnLongClickListener(l);
  }


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

}
