1/*
2 * Copyright (C) 2006 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.calendar;
18
19import android.content.Context;
20import android.content.res.Resources;
21import android.text.format.DateUtils;
22import android.text.format.Time;
23import android.util.TimeFormatException;
24
25import com.android.calendarcommon2.EventRecurrence;
26
27import java.util.Calendar;
28
29public class EventRecurrenceFormatter
30{
31
32    private static int[] mMonthRepeatByDayOfWeekIds;
33    private static String[][] mMonthRepeatByDayOfWeekStrs;
34
35    public static String getRepeatString(Context context, Resources r, EventRecurrence recurrence,
36            boolean includeEndString) {
37        String endString = "";
38        if (includeEndString) {
39            StringBuilder sb = new StringBuilder();
40            if (recurrence.until != null) {
41                try {
42                    Time t = new Time();
43                    t.parse(recurrence.until);
44                    final String dateStr = DateUtils.formatDateTime(context,
45                            t.toMillis(false), DateUtils.FORMAT_NUMERIC_DATE);
46                    sb.append(r.getString(R.string.endByDate, dateStr));
47                } catch (TimeFormatException e) {
48                }
49            }
50
51            if (recurrence.count > 0) {
52                sb.append(r.getQuantityString(R.plurals.endByCount, recurrence.count,
53                        recurrence.count));
54            }
55            endString = sb.toString();
56        }
57
58        // TODO Implement "Until" portion of string, as well as custom settings
59        int interval = recurrence.interval <= 1 ? 1 : recurrence.interval;
60        switch (recurrence.freq) {
61            case EventRecurrence.DAILY:
62                return r.getQuantityString(R.plurals.daily, interval, interval) + endString;
63            case EventRecurrence.WEEKLY: {
64                if (recurrence.repeatsOnEveryWeekDay()) {
65                    return r.getString(R.string.every_weekday) + endString;
66                } else {
67                    String string;
68
69                    int dayOfWeekLength = DateUtils.LENGTH_MEDIUM;
70                    if (recurrence.bydayCount == 1) {
71                        dayOfWeekLength = DateUtils.LENGTH_LONG;
72                    }
73
74                    StringBuilder days = new StringBuilder();
75
76                    // Do one less iteration in the loop so the last element is added out of the
77                    // loop. This is done so the comma is not placed after the last item.
78
79                    if (recurrence.bydayCount > 0) {
80                        int count = recurrence.bydayCount - 1;
81                        for (int i = 0 ; i < count ; i++) {
82                            days.append(dayToString(recurrence.byday[i], dayOfWeekLength));
83                            days.append(", ");
84                        }
85                        days.append(dayToString(recurrence.byday[count], dayOfWeekLength));
86
87                        string = days.toString();
88                    } else {
89                        // There is no "BYDAY" specifier, so use the day of the
90                        // first event.  For this to work, the setStartDate()
91                        // method must have been used by the caller to set the
92                        // date of the first event in the recurrence.
93                        if (recurrence.startDate == null) {
94                            return null;
95                        }
96
97                        int day = EventRecurrence.timeDay2Day(recurrence.startDate.weekDay);
98                        string = dayToString(day, DateUtils.LENGTH_LONG);
99                    }
100                    return r.getQuantityString(R.plurals.weekly, interval, interval, string)
101                            + endString;
102                }
103            }
104            case EventRecurrence.MONTHLY: {
105                if (recurrence.bydayCount == 1) {
106                    int weekday = recurrence.startDate.weekDay;
107                    // Cache this stuff so we won't have to redo work again later.
108                    cacheMonthRepeatStrings(r, weekday);
109                    int dayNumber = (recurrence.startDate.monthDay - 1) / 7;
110                    StringBuilder sb = new StringBuilder();
111                    sb.append(r.getString(R.string.monthly));
112                    sb.append(" (");
113                    sb.append(mMonthRepeatByDayOfWeekStrs[weekday][dayNumber]);
114                    sb.append(")");
115                    sb.append(endString);
116                    return sb.toString();
117                }
118                return r.getString(R.string.monthly) + endString;
119            }
120            case EventRecurrence.YEARLY:
121                return r.getString(R.string.yearly_plain) + endString;
122        }
123
124        return null;
125    }
126
127    private static void cacheMonthRepeatStrings(Resources r, int weekday) {
128        if (mMonthRepeatByDayOfWeekIds == null) {
129            mMonthRepeatByDayOfWeekIds = new int[7];
130            mMonthRepeatByDayOfWeekIds[0] = R.array.repeat_by_nth_sun;
131            mMonthRepeatByDayOfWeekIds[1] = R.array.repeat_by_nth_mon;
132            mMonthRepeatByDayOfWeekIds[2] = R.array.repeat_by_nth_tues;
133            mMonthRepeatByDayOfWeekIds[3] = R.array.repeat_by_nth_wed;
134            mMonthRepeatByDayOfWeekIds[4] = R.array.repeat_by_nth_thurs;
135            mMonthRepeatByDayOfWeekIds[5] = R.array.repeat_by_nth_fri;
136            mMonthRepeatByDayOfWeekIds[6] = R.array.repeat_by_nth_sat;
137        }
138        if (mMonthRepeatByDayOfWeekStrs == null) {
139            mMonthRepeatByDayOfWeekStrs = new String[7][];
140        }
141        if (mMonthRepeatByDayOfWeekStrs[weekday] == null) {
142            mMonthRepeatByDayOfWeekStrs[weekday] =
143                    r.getStringArray(mMonthRepeatByDayOfWeekIds[weekday]);
144        }
145    }
146
147    /**
148     * Converts day of week to a String.
149     * @param day a EventRecurrence constant
150     * @return day of week as a string
151     */
152    private static String dayToString(int day, int dayOfWeekLength) {
153        return DateUtils.getDayOfWeekString(dayToUtilDay(day), dayOfWeekLength);
154    }
155
156    /**
157     * Converts EventRecurrence's day of week to DateUtil's day of week.
158     * @param day of week as an EventRecurrence value
159     * @return day of week as a DateUtil value.
160     */
161    private static int dayToUtilDay(int day) {
162        switch (day) {
163        case EventRecurrence.SU: return Calendar.SUNDAY;
164        case EventRecurrence.MO: return Calendar.MONDAY;
165        case EventRecurrence.TU: return Calendar.TUESDAY;
166        case EventRecurrence.WE: return Calendar.WEDNESDAY;
167        case EventRecurrence.TH: return Calendar.THURSDAY;
168        case EventRecurrence.FR: return Calendar.FRIDAY;
169        case EventRecurrence.SA: return Calendar.SATURDAY;
170        default: throw new IllegalArgumentException("bad day argument: " + day);
171        }
172    }
173}
174