/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.apache.myfaces.tobago.model;
  
  import java.text.DecimalFormat;
  import java.text.SimpleDateFormat;
  import java.util.Calendar;
  
  public class CalendarModel {
  
    private DateModel[][] calendarArray;
    private int firstDayOffset;
  
    public CalendarModel(Calendar calendar) {
  //    int weekCount = CalendarUtils.weekCount(calendar);
      int weekCount = 6; // switching off dynamic weekCount!
      calendarArray = new DateModel[weekCount][7];
      Calendar c = (Calendar) calendar.clone();
      c.clear(Calendar.DAY_OF_MONTH);
      c.set(Calendar.DAY_OF_MONTH, 1);
      // assert c.isLenient() : "'add -x days' may not work in a non-lenient calendar";
      firstDayOffset = firstDayOffset(c);
      c.add(Calendar.DAY_OF_WEEK, -firstDayOffset);
      for (int week = 0; week < weekCount; ++week) {
        for (int day = 0; day < 7; ++day) {
          calendarArray[week][day] = new DateModel(c);
          c.add(Calendar.DAY_OF_MONTH, 1);
        }
      }
    }
  
    public int getWeekCount() {
      return calendarArray.length;
    }
  
    public int getMonth() {
      return calendarArray[0][firstDayOffset].getMonth();
    }
  
    public int getYear() {
      return calendarArray[0][firstDayOffset].getYear();
    }
  
    public DateModel getDate(int week, int day) {
      return calendarArray[week][day];
    }
  
    private int firstDayOffset(Calendar calendar) {
      Calendar c = (Calendar) calendar.clone();
      c.clear(Calendar.DAY_OF_MONTH);
      c.set(Calendar.DAY_OF_MONTH, 1);
      int day = c.get(Calendar.DAY_OF_WEEK);
      int firstDayOfWeek = c.getFirstDayOfWeek();
      // Fails: assertEquals((1+7-3)%7, (1-3)%7);
      return (day + 7 - firstDayOfWeek) % 7;
    }
  
    public String toString() {
      StringBuilder buffer = new StringBuilder();
      buffer.append("Month: ").append(getMonth()).append("\n");
      int weekCount = getWeekCount();
      DecimalFormat format = new DecimalFormat("00");
      SimpleDateFormat dateFormat = new SimpleDateFormat("E");
      for (int day = 0; day < 7; ++day) {
        DateModel date = getDate(0, day);
        String dayName = dateFormat.format(date.getCalendar().getTime());
        buffer.append(dayName.substring(0, 2)).append(" ");
      }
      buffer.append("\n");
      for (int week = 0; week < weekCount; ++week) {
        for (int day = 0; day < 7; ++day) {
          DateModel date = getDate(week, day);
          buffer.append(format.format(date.getDay())).append(" ");
        }
        buffer.append("\n");
      }
      return buffer.toString();
    }
  
  }