/*
 * Copyright (C) 2011 The Android Open Source Project
 * Copyright (C) 2013 Android Open Kang Project
 *
 * 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 com.android.dialer.callstats;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.Spinner;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.Calendar;

import com.android.dialer.R;

/**
 * Alertdialog with two date pickers - one for a start and one for an end date.
 * Used to filter the callstats query.
 */
public class DoubleDatePickerDialog extends AlertDialog
    implements OnClickListener, OnDateChangedListener, OnItemSelectedListener {

  private static final String TAG = "DoubleDatePickerDialog";

  public interface OnDateSetListener {
    void onDateSet(long from, long to);
  }

  public static class Fragment extends DialogFragment implements OnDateSetListener {
    private DoubleDatePickerDialog mDialog;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
      mDialog = new DoubleDatePickerDialog(getActivity(), this);
      return mDialog;
    }

    @Override
    public void onStart() {
      final Bundle args = getArguments();
      final long from = args.getLong("from", -1);
      final long to = args.getLong("to", -1);

      if (from != -1) {
          mDialog.setValues(from, to);
      } else {
          mDialog.resetPickers();
      }
      super.onStart();
    }

    @Override
    public void onDateSet(long from, long to) {
      ((DoubleDatePickerDialog.OnDateSetListener) getActivity()).onDateSet(from, to);
    }

    public static Bundle createArguments(long from, long to) {
      final Bundle args = new Bundle();
      args.putLong("from", from);
      args.putLong("to", to);
      return args;
    }
  }

  private interface QuickSelection {
    void adjustStartDate(Calendar date);
  }

  private static final int[] QUICKSELECTION_ENTRIES = new int[] {
    R.string.date_qs_currentmonth,
    R.string.date_qs_currentquarter,
    R.string.date_qs_currentyear,
    R.string.date_qs_lastweek,
    R.string.date_qs_lastmonth,
    R.string.date_qs_lastquarter,
    R.string.date_qs_lastyear
  };

  private static final QuickSelection[] QUICKSELECTIONS = new QuickSelection[] {
    new QuickSelection() {
      @Override
      public void adjustStartDate(Calendar date) {
          date.set(Calendar.DAY_OF_MONTH, 1);
      }
    },
    new QuickSelection() {
      @Override
      public void adjustStartDate(Calendar date) {
        final int currentMonth = date.get(Calendar.MONTH);
        date.set(Calendar.MONTH, currentMonth - (currentMonth % 3));
        date.set(Calendar.DAY_OF_MONTH, 1);
      }
    },
    new QuickSelection() {
      @Override
      public void adjustStartDate(Calendar date) {
        date.set(Calendar.MONTH, 0);
        date.set(Calendar.DAY_OF_MONTH, 1);
      }
    },
    new QuickSelection() {
      @Override
      public void adjustStartDate(Calendar date) {
        date.add(Calendar.WEEK_OF_YEAR, -1);
      }
    },
    new QuickSelection() {
      @Override
      public void adjustStartDate(Calendar date) {
        date.add(Calendar.MONTH, -1);
      }
    },
    new QuickSelection() {
      @Override
      public void adjustStartDate(Calendar date) {
        date.add(Calendar.MONTH, -3);
      }
    },
    new QuickSelection() {
      @Override
      public void adjustStartDate(Calendar date) {
        date.add(Calendar.YEAR, -1);
      }
    },
  };

  private static final String YEAR = "year";
  private static final String MONTH = "month";
  private static final String DAY = "day";

  private final Spinner mQuickSelSpinner;
  private final DatePicker mDatePickerFrom;
  private final DatePicker mDatePickerTo;
  private final OnDateSetListener mCallBack;
  private Button mOkButton;
  private int mQuickSelSelection = -1;

  public DoubleDatePickerDialog(final Context context, OnDateSetListener callBack) {
    super(context);

    mCallBack = callBack;

    setTitle(R.string.call_stats_filter_picker_title);
    setButton(BUTTON_NEGATIVE, context.getString(android.R.string.cancel), this);
    setButton(BUTTON_POSITIVE, context.getString(android.R.string.ok), this);
    setIcon(0);

    LayoutInflater inflater =
        (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = inflater.inflate(R.layout.double_date_picker_dialog, null);
    setView(view);

    mDatePickerFrom = (DatePicker) view.findViewById(R.id.date_picker_from);
    mDatePickerTo = (DatePicker) view.findViewById(R.id.date_picker_to);

    ArrayList<CharSequence> quickSelEntries = new ArrayList<CharSequence>();
    for (int entryId : QUICKSELECTION_ENTRIES) {
      quickSelEntries.add(context.getString(entryId));
    }
    ArrayAdapter<CharSequence> quickSelAdapter = new ArrayAdapter<CharSequence>(
        context, android.R.layout.simple_spinner_item, android.R.id.text1, quickSelEntries) {
      @Override
      public View getView(int position, View convertView, android.view.ViewGroup parent) {
        final TextView v = (TextView) super.getView(position, convertView, parent);
        v.setText(context.getString(R.string.date_quick_selection));
        return v;
      }
    };
    quickSelAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    mQuickSelSpinner = (Spinner) view.findViewById(R.id.date_quick_selection);
    mQuickSelSpinner.setOnItemSelectedListener(this);
    mQuickSelSpinner.setAdapter(quickSelAdapter);

    resetPickers();
  }

  @Override
  protected void onStart() {
    super.onStart();
    mOkButton = getButton(DialogInterface.BUTTON_POSITIVE);
    updateOkButtonState();
  }

  @Override
  public void onClick(DialogInterface dialog, int which) {
    switch (which) {
      case BUTTON_POSITIVE:
        tryNotifyDateSet();
        break;
      case BUTTON_NEGATIVE:
        break;
    }
  }

  @Override
  public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
    if (mQuickSelSelection >= 0) {
      QuickSelection sel = QUICKSELECTIONS[pos];
      Calendar from = Calendar.getInstance();
      long millisTo = from.getTimeInMillis();
      sel.adjustStartDate(from);
      long millisFrom = from.getTimeInMillis();

      setValues(millisFrom, millisTo);
    }
    mQuickSelSelection = pos;
  }

  @Override
  public void onNothingSelected(AdapterView<?> parent) {
  }

  public void onDateChanged(DatePicker view, int year, int month, int day) {
    view.init(year, month, day, this);
    updateOkButtonState();
  }

  public void setValues(long millisFrom, long millisTo) {
    setPicker(mDatePickerFrom, millisFrom);
    setPicker(mDatePickerTo, millisTo);
    updateOkButtonState();
  }

  public void resetPickers() {
    long millis = System.currentTimeMillis();
    setPicker(mDatePickerFrom, millis);
    setPicker(mDatePickerTo, millis);
    updateOkButtonState();
  }

  private void setPicker(DatePicker picker, long millis) {
    Calendar c = Calendar.getInstance();
    c.setTimeInMillis(millis);

    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);

    picker.init(year, month, day, this);
  }

  private long getMillisForPicker(DatePicker picker, boolean endOfDay) {
    Calendar c = Calendar.getInstance();
    c.set(Calendar.YEAR, picker.getYear());
    c.set(Calendar.MONTH, picker.getMonth());
    c.set(Calendar.DAY_OF_MONTH, picker.getDayOfMonth());
    c.set(Calendar.HOUR_OF_DAY, 0);
    c.set(Calendar.MINUTE, 0);
    c.set(Calendar.SECOND, 0);

    long millis = c.getTimeInMillis();
    if (endOfDay) {
      millis += 24L * 60L * 60L * 1000L - 1L;
    }

    return millis;
  }

  private void updateOkButtonState() {
    if (mOkButton != null) {
      long millisFrom = getMillisForPicker(mDatePickerFrom, false);
      long millisTo = getMillisForPicker(mDatePickerTo, true);
      mOkButton.setEnabled(millisFrom < millisTo);
    }
  }

  private void tryNotifyDateSet() {
    if (mCallBack != null) {
      mDatePickerFrom.clearFocus();
      mDatePickerTo.clearFocus();

      long millisFrom = getMillisForPicker(mDatePickerFrom, false);
      long millisTo = getMillisForPicker(mDatePickerTo, true);

      mCallBack.onDateSet(millisFrom, millisTo);
    }
  }

  // users like to play with it, so save the state and don't reset each time
  @Override
  public Bundle onSaveInstanceState() {
    Bundle state = super.onSaveInstanceState();
    state.putInt("F_" + YEAR, mDatePickerFrom.getYear());
    state.putInt("F_" + MONTH, mDatePickerFrom.getMonth());
    state.putInt("F_" + DAY, mDatePickerFrom.getDayOfMonth());
    state.putInt("T_" + YEAR, mDatePickerTo.getYear());
    state.putInt("T_" + MONTH, mDatePickerTo.getMonth());
    state.putInt("T_" + DAY, mDatePickerTo.getDayOfMonth());
    return state;
  }

  @Override
  public void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    int fyear = savedInstanceState.getInt("F_" + YEAR);
    int fmonth = savedInstanceState.getInt("F_" + MONTH);
    int fday = savedInstanceState.getInt("F_" + DAY);
    int tyear = savedInstanceState.getInt("T_" + YEAR);
    int tmonth = savedInstanceState.getInt("T_" + MONTH);
    int tday = savedInstanceState.getInt("T_" + DAY);
    mDatePickerFrom.init(fyear, fmonth, fday, this);
    mDatePickerTo.init(tyear, tmonth, tday, this);
  }
}