/*
 * Copyright (C) 2013 The Android Open Source 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.gallery3d.ingest.data;

import android.annotation.TargetApi;
import android.os.Build;

import java.text.DateFormat;
import java.util.Calendar;

/**
 * Represents a date (year, month, day)
 */
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
public class SimpleDate implements Comparable<SimpleDate> {
  public int month; // MM
  public int day; // DD
  public int year; // YYYY
  private long timestamp;
  private String mCachedStringRepresentation;

  public SimpleDate() {
  }

  public SimpleDate(long timestamp) {
    setTimestamp(timestamp);
  }

  private static Calendar sCalendarInstance = Calendar.getInstance();

  public void setTimestamp(long timestamp) {
    synchronized (sCalendarInstance) {
      // TODO(georgescu): find a more efficient way to convert a timestamp to a date?
      sCalendarInstance.setTimeInMillis(timestamp);
      this.day = sCalendarInstance.get(Calendar.DATE);
      this.month = sCalendarInstance.get(Calendar.MONTH);
      this.year = sCalendarInstance.get(Calendar.YEAR);
      this.timestamp = timestamp;
      mCachedStringRepresentation =
          DateFormat.getDateInstance(DateFormat.SHORT).format(timestamp);
    }
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + day;
    result = prime * result + month;
    result = prime * result + year;
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (!(obj instanceof SimpleDate)) {
      return false;
    }
    SimpleDate other = (SimpleDate) obj;
    if (year != other.year) {
      return false;
    }
    if (month != other.month) {
      return false;
    }
    if (day != other.day) {
      return false;
    }
    return true;
  }

  @Override
  public int compareTo(SimpleDate other) {
    int yearDiff = this.year - other.getYear();
    if (yearDiff != 0) {
      return yearDiff;
    } else {
      int monthDiff = this.month - other.getMonth();
      if (monthDiff != 0) {
        return monthDiff;
      } else {
        return this.day - other.getDay();
      }
    }
  }

  public int getDay() {
    return day;
  }

  public int getMonth() {
    return month;
  }

  public int getYear() {
    return year;
  }

  @Override
  public String toString() {
    if (mCachedStringRepresentation == null) {
      mCachedStringRepresentation =
          DateFormat.getDateInstance(DateFormat.SHORT).format(timestamp);
    }
    return mCachedStringRepresentation;
  }
}