aboutsummaryrefslogtreecommitdiffstats
path: root/actionview/lib/action_view/helpers/date_helper.rb
blob: ae993f9aa2052f18be2b9e6955f6cbd2d7d64712 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
# frozen_string_literal: true

require "date"
require "action_view/helpers/tag_helper"
require "active_support/core_ext/array/extract_options"
require "active_support/core_ext/date/conversions"
require "active_support/core_ext/hash/slice"
require "active_support/core_ext/object/acts_like"
require "active_support/core_ext/object/with_options"

module ActionView
  module Helpers #:nodoc:
    # = Action View Date Helpers
    #
    # The Date Helper primarily creates select/option tags for different kinds of dates and times or date and time
    # elements. All of the select-type methods share a number of common options that are as follows:
    #
    # * <tt>:prefix</tt> - overwrites the default prefix of "date" used for the select names. So specifying "birthday"
    #   would give \birthday[month] instead of \date[month] if passed to the <tt>select_month</tt> method.
    # * <tt>:include_blank</tt> - set to true if it should be possible to set an empty date.
    # * <tt>:discard_type</tt> - set to true if you want to discard the type part of the select name. If set to true,
    #   the <tt>select_month</tt> method would use simply "date" (which can be overwritten using <tt>:prefix</tt>) instead
    #   of \date[month].
    module DateHelper
      MINUTES_IN_YEAR = 525600
      MINUTES_IN_QUARTER_YEAR = 131400
      MINUTES_IN_THREE_QUARTERS_YEAR = 394200

      # Reports the approximate distance in time between two Time, Date or DateTime objects or integers as seconds.
      # Pass <tt>include_seconds: true</tt> if you want more detailed approximations when distance < 1 min, 29 secs.
      # Distances are reported based on the following table:
      #
      #   0 <-> 29 secs                                                             # => less than a minute
      #   30 secs <-> 1 min, 29 secs                                                # => 1 minute
      #   1 min, 30 secs <-> 44 mins, 29 secs                                       # => [2..44] minutes
      #   44 mins, 30 secs <-> 89 mins, 29 secs                                     # => about 1 hour
      #   89 mins, 30 secs <-> 23 hrs, 59 mins, 29 secs                             # => about [2..24] hours
      #   23 hrs, 59 mins, 30 secs <-> 41 hrs, 59 mins, 29 secs                     # => 1 day
      #   41 hrs, 59 mins, 30 secs  <-> 29 days, 23 hrs, 59 mins, 29 secs           # => [2..29] days
      #   29 days, 23 hrs, 59 mins, 30 secs <-> 44 days, 23 hrs, 59 mins, 29 secs   # => about 1 month
      #   44 days, 23 hrs, 59 mins, 30 secs <-> 59 days, 23 hrs, 59 mins, 29 secs   # => about 2 months
      #   59 days, 23 hrs, 59 mins, 30 secs <-> 1 yr minus 1 sec                    # => [2..12] months
      #   1 yr <-> 1 yr, 3 months                                                   # => about 1 year
      #   1 yr, 3 months <-> 1 yr, 9 months                                         # => over 1 year
      #   1 yr, 9 months <-> 2 yr minus 1 sec                                       # => almost 2 years
      #   2 yrs <-> max time or date                                                # => (same rules as 1 yr)
      #
      # With <tt>include_seconds: true</tt> and the difference < 1 minute 29 seconds:
      #   0-4   secs      # => less than 5 seconds
      #   5-9   secs      # => less than 10 seconds
      #   10-19 secs      # => less than 20 seconds
      #   20-39 secs      # => half a minute
      #   40-59 secs      # => less than a minute
      #   60-89 secs      # => 1 minute
      #
      #   from_time = Time.now
      #   distance_of_time_in_words(from_time, from_time + 50.minutes)                                # => about 1 hour
      #   distance_of_time_in_words(from_time, 50.minutes.from_now)                                   # => about 1 hour
      #   distance_of_time_in_words(from_time, from_time + 15.seconds)                                # => less than a minute
      #   distance_of_time_in_words(from_time, from_time + 15.seconds, include_seconds: true)         # => less than 20 seconds
      #   distance_of_time_in_words(from_time, 3.years.from_now)                                      # => about 3 years
      #   distance_of_time_in_words(from_time, from_time + 60.hours)                                  # => 3 days
      #   distance_of_time_in_words(from_time, from_time + 45.seconds, include_seconds: true)         # => less than a minute
      #   distance_of_time_in_words(from_time, from_time - 45.seconds, include_seconds: true)         # => less than a minute
      #   distance_of_time_in_words(from_time, 76.seconds.from_now)                                   # => 1 minute
      #   distance_of_time_in_words(from_time, from_time + 1.year + 3.days)                           # => about 1 year
      #   distance_of_time_in_words(from_time, from_time + 3.years + 6.months)                        # => over 3 years
      #   distance_of_time_in_words(from_time, from_time + 4.years + 9.days + 30.minutes + 5.seconds) # => about 4 years
      #
      #   to_time = Time.now + 6.years + 19.days
      #   distance_of_time_in_words(from_time, to_time, include_seconds: true)                        # => about 6 years
      #   distance_of_time_in_words(to_time, from_time, include_seconds: true)                        # => about 6 years
      #   distance_of_time_in_words(Time.now, Time.now)                                               # => less than a minute
      #
      # With the <tt>scope</tt> option, you can define a custom scope for Rails
      # to look up the translation.
      #
      # For example you can define the following in your locale (e.g. en.yml).
      #
      #   datetime:
      #     distance_in_words:
      #       short:
      #         about_x_hours:
      #           one: 'an hour'
      #           other: '%{count} hours'
      #
      # See https://github.com/svenfuchs/rails-i18n/blob/master/rails/locale/en.yml
      # for more examples.
      #
      # Which will then result in the following:
      #
      #   from_time = Time.now
      #   distance_of_time_in_words(from_time, from_time + 50.minutes, scope: 'datetime.distance_in_words.short') # => "an hour"
      #   distance_of_time_in_words(from_time, from_time + 3.hours, scope: 'datetime.distance_in_words.short')    # => "3 hours"
      def distance_of_time_in_words(from_time, to_time = 0, options = {})
        options = {
          scope: :'datetime.distance_in_words'
        }.merge!(options)

        from_time = normalize_distance_of_time_argument_to_time(from_time)
        to_time = normalize_distance_of_time_argument_to_time(to_time)
        from_time, to_time = to_time, from_time if from_time > to_time
        distance_in_minutes = ((to_time - from_time) / 60.0).round
        distance_in_seconds = (to_time - from_time).round

        I18n.with_options locale: options[:locale], scope: options[:scope] do |locale|
          case distance_in_minutes
          when 0..1
            return distance_in_minutes == 0 ?
                   locale.t(:less_than_x_minutes, count: 1) :
                   locale.t(:x_minutes, count: distance_in_minutes) unless options[:include_seconds]

            case distance_in_seconds
            when 0..4   then locale.t :less_than_x_seconds, count: 5
            when 5..9   then locale.t :less_than_x_seconds, count: 10
            when 10..19 then locale.t :less_than_x_seconds, count: 20
            when 20..39 then locale.t :half_a_minute
            when 40..59 then locale.t :less_than_x_minutes, count: 1
            else             locale.t :x_minutes,           count: 1
            end

          when 2...45           then locale.t :x_minutes,      count: distance_in_minutes
          when 45...90          then locale.t :about_x_hours,  count: 1
            # 90 mins up to 24 hours
          when 90...1440        then locale.t :about_x_hours,  count: (distance_in_minutes.to_f / 60.0).round
            # 24 hours up to 42 hours
          when 1440...2520      then locale.t :x_days,         count: 1
            # 42 hours up to 30 days
          when 2520...43200     then locale.t :x_days,         count: (distance_in_minutes.to_f / 1440.0).round
            # 30 days up to 60 days
          when 43200...86400    then locale.t :about_x_months, count: (distance_in_minutes.to_f / 43200.0).round
            # 60 days up to 365 days
          when 86400...525600   then locale.t :x_months,       count: (distance_in_minutes.to_f / 43200.0).round
          else
            from_year = from_time.year
            from_year += 1 if from_time.month >= 3
            to_year = to_time.year
            to_year -= 1 if to_time.month < 3
            leap_years = (from_year > to_year) ? 0 : (from_year..to_year).count { |x| Date.leap?(x) }
            minute_offset_for_leap_year = leap_years * 1440
            # Discount the leap year days when calculating year distance.
            # e.g. if there are 20 leap year days between 2 dates having the same day
            # and month then the based on 365 days calculation
            # the distance in years will come out to over 80 years when in written
            # English it would read better as about 80 years.
            minutes_with_offset = distance_in_minutes - minute_offset_for_leap_year
            remainder                   = (minutes_with_offset % MINUTES_IN_YEAR)
            distance_in_years           = (minutes_with_offset.div MINUTES_IN_YEAR)
            if remainder < MINUTES_IN_QUARTER_YEAR
              locale.t(:about_x_years,  count: distance_in_years)
            elsif remainder < MINUTES_IN_THREE_QUARTERS_YEAR
              locale.t(:over_x_years,   count: distance_in_years)
            else
              locale.t(:almost_x_years, count: distance_in_years + 1)
            end
          end
        end
      end

      # Like <tt>distance_of_time_in_words</tt>, but where <tt>to_time</tt> is fixed to <tt>Time.now</tt>.
      #
      #   time_ago_in_words(3.minutes.from_now)                 # => 3 minutes
      #   time_ago_in_words(3.minutes.ago)                      # => 3 minutes
      #   time_ago_in_words(Time.now - 15.hours)                # => about 15 hours
      #   time_ago_in_words(Time.now)                           # => less than a minute
      #   time_ago_in_words(Time.now, include_seconds: true) # => less than 5 seconds
      #
      #   from_time = Time.now - 3.days - 14.minutes - 25.seconds
      #   time_ago_in_words(from_time)      # => 3 days
      #
      #   from_time = (3.days + 14.minutes + 25.seconds).ago
      #   time_ago_in_words(from_time)      # => 3 days
      #
      # Note that you cannot pass a <tt>Numeric</tt> value to <tt>time_ago_in_words</tt>.
      #
      def time_ago_in_words(from_time, options = {})
        distance_of_time_in_words(from_time, Time.now, options)
      end

      alias_method :distance_of_time_in_words_to_now, :time_ago_in_words

      # Returns a set of select tags (one for year, month, and day) pre-selected for accessing a specified date-based
      # attribute (identified by +method+) on an object assigned to the template (identified by +object+).
      #
      # ==== Options
      # * <tt>:use_month_numbers</tt> - Set to true if you want to use month numbers rather than month names (e.g.
      #   "2" instead of "February").
      # * <tt>:use_two_digit_numbers</tt> - Set to true if you want to display two digit month and day numbers (e.g.
      #   "02" instead of "February" and "08" instead of "8").
      # * <tt>:use_short_month</tt>   - Set to true if you want to use abbreviated month names instead of full
      #   month names (e.g. "Feb" instead of "February").
      # * <tt>:add_month_numbers</tt>  - Set to true if you want to use both month numbers and month names (e.g.
      #   "2 - February" instead of "February").
      # * <tt>:use_month_names</tt>   - Set to an array with 12 month names if you want to customize month names.
      #   Note: You can also use Rails' i18n functionality for this.
      # * <tt>:month_format_string</tt> - Set to a format string. The string gets passed keys +:number+ (integer)
      #   and +:name+ (string). A format string would be something like "%{name} (%<number>02d)" for example.
      #   See <tt>Kernel.sprintf</tt> for documentation on format sequences.
      # * <tt>:date_separator</tt>    - Specifies a string to separate the date fields. Default is "" (i.e. nothing).
      # * <tt>:time_separator</tt>    - Specifies a string to separate the time fields. Default is "" (i.e. nothing).
      # * <tt>:datetime_separator</tt>- Specifies a string to separate the date and time fields. Default is "" (i.e. nothing).
      # * <tt>:start_year</tt>        - Set the start year for the year select. Default is <tt>Date.today.year - 5</tt> if
      #   you are creating new record. While editing existing record, <tt>:start_year</tt> defaults to
      #   the current selected year minus 5.
      # * <tt>:end_year</tt>          - Set the end year for the year select. Default is <tt>Date.today.year + 5</tt> if
      #   you are creating new record. While editing existing record, <tt>:end_year</tt> defaults to
      #   the current selected year plus 5.
      # * <tt>:year_format</tt>       - Set format of years for year select. Lambda should be passed.
      # * <tt>:discard_day</tt>       - Set to true if you don't want to show a day select. This includes the day
      #   as a hidden field instead of showing a select field. Also note that this implicitly sets the day to be the
      #   first of the given month in order to not create invalid dates like 31 February.
      # * <tt>:discard_month</tt>     - Set to true if you don't want to show a month select. This includes the month
      #   as a hidden field instead of showing a select field. Also note that this implicitly sets :discard_day to true.
      # * <tt>:discard_year</tt>      - Set to true if you don't want to show a year select. This includes the year
      #   as a hidden field instead of showing a select field.
      # * <tt>:order</tt>             - Set to an array containing <tt>:day</tt>, <tt>:month</tt> and <tt>:year</tt> to
      #   customize the order in which the select fields are shown. If you leave out any of the symbols, the respective
      #   select will not be shown (like when you set <tt>discard_xxx: true</tt>. Defaults to the order defined in
      #   the respective locale (e.g. [:year, :month, :day] in the en locale that ships with Rails).
      # * <tt>:include_blank</tt>     - Include a blank option in every select field so it's possible to set empty
      #   dates.
      # * <tt>:default</tt>           - Set a default date if the affected date isn't set or is +nil+.
      # * <tt>:selected</tt>          - Set a date that overrides the actual value.
      # * <tt>:disabled</tt>          - Set to true if you want show the select fields as disabled.
      # * <tt>:prompt</tt>            - Set to true (for a generic prompt), a prompt string or a hash of prompt strings
      #   for <tt>:year</tt>, <tt>:month</tt>, <tt>:day</tt>, <tt>:hour</tt>, <tt>:minute</tt> and <tt>:second</tt>.
      #   Setting this option prepends a select option with a generic prompt  (Day, Month, Year, Hour, Minute, Seconds)
      #   or the given prompt string.
      # * <tt>:with_css_classes</tt>  - Set to true or a hash of strings. Use true if you want to assign generic styles for
      #   select tags. This automatically set classes 'year', 'month', 'day', 'hour', 'minute' and 'second'. A hash of
      #   strings for <tt>:year</tt>, <tt>:month</tt>, <tt>:day</tt>, <tt>:hour</tt>, <tt>:minute</tt>, <tt>:second</tt>
      #   will extend the select type with the given value. Use +html_options+ to modify every select tag in the set.
      # * <tt>:use_hidden</tt>         - Set to true if you only want to generate hidden input tags.
      #
      # If anything is passed in the +html_options+ hash it will be applied to every select tag in the set.
      #
      # NOTE: Discarded selects will default to 1. So if no month select is available, January will be assumed.
      #
      #   # Generates a date select that when POSTed is stored in the article variable, in the written_on attribute.
      #   date_select("article", "written_on")
      #
      #   # Generates a date select that when POSTed is stored in the article variable, in the written_on attribute,
      #   # with the year in the year drop down box starting at 1995.
      #   date_select("article", "written_on", start_year: 1995)
      #
      #   # Generates a date select that when POSTed is stored in the article variable, in the written_on attribute,
      #   # with the year in the year drop down box starting at 1995, numbers used for months instead of words,
      #   # and without a day select box.
      #   date_select("article", "written_on", start_year: 1995, use_month_numbers: true,
      #                                     discard_day: true, include_blank: true)
      #
      #   # Generates a date select that when POSTed is stored in the article variable, in the written_on attribute,
      #   # with two digit numbers used for months and days.
      #   date_select("article", "written_on", use_two_digit_numbers: true)
      #
      #   # Generates a date select that when POSTed is stored in the article variable, in the written_on attribute
      #   # with the fields ordered as day, month, year rather than month, day, year.
      #   date_select("article", "written_on", order: [:day, :month, :year])
      #
      #   # Generates a date select that when POSTed is stored in the user variable, in the birthday attribute
      #   # lacking a year field.
      #   date_select("user", "birthday", order: [:month, :day])
      #
      #   # Generates a date select that when POSTed is stored in the article variable, in the written_on attribute
      #   # which is initially set to the date 3 days from the current date
      #   date_select("article", "written_on", default: 3.days.from_now)
      #
      #   # Generates a date select that when POSTed is stored in the article variable, in the written_on attribute
      #   # which is set in the form with today's date, regardless of the value in the Active Record object.
      #   date_select("article", "written_on", selected: Date.today)
      #
      #   # Generates a date select that when POSTed is stored in the credit_card variable, in the bill_due attribute
      #   # that will have a default day of 20.
      #   date_select("credit_card", "bill_due", default: { day: 20 })
      #
      #   # Generates a date select with custom prompts.
      #   date_select("article", "written_on", prompt: { day: 'Select day', month: 'Select month', year: 'Select year' })
      #
      #   # Generates a date select with custom year format.
      #   date_select("article", "written_on", year_format: ->(year) { "Heisei #{year - 1988}" })
      #
      # The selects are prepared for multi-parameter assignment to an Active Record object.
      #
      # Note: If the day is not included as an option but the month is, the day will be set to the 1st to ensure that
      # all month choices are valid.
      def date_select(object_name, method, options = {}, html_options = {})
        Tags::DateSelect.new(object_name, method, self, options, html_options).render
      end

      # Returns a set of select tags (one for hour, minute and optionally second) pre-selected for accessing a
      # specified time-based attribute (identified by +method+) on an object assigned to the template (identified by
      # +object+). You can include the seconds with <tt>:include_seconds</tt>. You can get hours in the AM/PM format
      # with <tt>:ampm</tt> option.
      #
      # This method will also generate 3 input hidden tags, for the actual year, month and day unless the option
      # <tt>:ignore_date</tt> is set to +true+. If you set the <tt>:ignore_date</tt> to +true+, you must have a
      # +date_select+ on the same method within the form otherwise an exception will be raised.
      #
      # If anything is passed in the html_options hash it will be applied to every select tag in the set.
      #
      #   # Creates a time select tag that, when POSTed, will be stored in the article variable in the sunrise attribute.
      #   time_select("article", "sunrise")
      #
      #   # Creates a time select tag with a seconds field that, when POSTed, will be stored in the article variables in
      #   # the sunrise attribute.
      #   time_select("article", "start_time", include_seconds: true)
      #
      #   # You can set the <tt>:minute_step</tt> to 15 which will give you: 00, 15, 30, and 45.
      #   time_select 'game', 'game_time', { minute_step: 15 }
      #
      #   # Creates a time select tag with a custom prompt. Use <tt>prompt: true</tt> for generic prompts.
      #   time_select("article", "written_on", prompt: { hour: 'Choose hour', minute: 'Choose minute', second: 'Choose seconds' })
      #   time_select("article", "written_on", prompt: { hour: true }) # generic prompt for hours
      #   time_select("article", "written_on", prompt: true) # generic prompts for all
      #
      #   # You can set :ampm option to true which will show the hours as: 12 PM, 01 AM .. 11 PM.
      #   time_select 'game', 'game_time', { ampm: true }
      #
      # The selects are prepared for multi-parameter assignment to an Active Record object.
      #
      # Note: If the day is not included as an option but the month is, the day will be set to the 1st to ensure that
      # all month choices are valid.
      def time_select(object_name, method, options = {}, html_options = {})
        Tags::TimeSelect.new(object_name, method, self, options, html_options).render
      end

      # Returns a set of select tags (one for year, month, day, hour, and minute) pre-selected for accessing a
      # specified datetime-based attribute (identified by +method+) on an object assigned to the template (identified
      # by +object+).
      #
      # If anything is passed in the html_options hash it will be applied to every select tag in the set.
      #
      #   # Generates a datetime select that, when POSTed, will be stored in the article variable in the written_on
      #   # attribute.
      #   datetime_select("article", "written_on")
      #
      #   # Generates a datetime select with a year select that starts at 1995 that, when POSTed, will be stored in the
      #   # article variable in the written_on attribute.
      #   datetime_select("article", "written_on", start_year: 1995)
      #
      #   # Generates a datetime select with a default value of 3 days from the current time that, when POSTed, will
      #   # be stored in the trip variable in the departing attribute.
      #   datetime_select("trip", "departing", default: 3.days.from_now)
      #
      #   # Generate a datetime select with hours in the AM/PM format
      #   datetime_select("article", "written_on", ampm: true)
      #
      #   # Generates a datetime select that discards the type that, when POSTed, will be stored in the article variable
      #   # as the written_on attribute.
      #   datetime_select("article", "written_on", discard_type: true)
      #
      #   # Generates a datetime select with a custom prompt. Use <tt>prompt: true</tt> for generic prompts.
      #   datetime_select("article", "written_on", prompt: { day: 'Choose day', month: 'Choose month', year: 'Choose year' })
      #   datetime_select("article", "written_on", prompt: { hour: true }) # generic prompt for hours
      #   datetime_select("article", "written_on", prompt: true) # generic prompts for all
      #
      # The selects are prepared for multi-parameter assignment to an Active Record object.
      def datetime_select(object_name, method, options = {}, html_options = {})
        Tags::DatetimeSelect.new(object_name, method, self, options, html_options).render
      end

      # Returns a set of HTML select-tags (one for year, month, day, hour, minute, and second) pre-selected with the
      # +datetime+. It's also possible to explicitly set the order of the tags using the <tt>:order</tt> option with
      # an array of symbols <tt>:year</tt>, <tt>:month</tt> and <tt>:day</tt> in the desired order. If you do not
      # supply a Symbol, it will be appended onto the <tt>:order</tt> passed in. You can also add
      # <tt>:date_separator</tt>, <tt>:datetime_separator</tt> and <tt>:time_separator</tt> keys to the +options+ to
      # control visual display of the elements.
      #
      # If anything is passed in the html_options hash it will be applied to every select tag in the set.
      #
      #   my_date_time = Time.now + 4.days
      #
      #   # Generates a datetime select that defaults to the datetime in my_date_time (four days after today).
      #   select_datetime(my_date_time)
      #
      #   # Generates a datetime select that defaults to today (no specified datetime)
      #   select_datetime()
      #
      #   # Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
      #   # with the fields ordered year, month, day rather than month, day, year.
      #   select_datetime(my_date_time, order: [:year, :month, :day])
      #
      #   # Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
      #   # with a '/' between each date field.
      #   select_datetime(my_date_time, date_separator: '/')
      #
      #   # Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
      #   # with a date fields separated by '/', time fields separated by '' and the date and time fields
      #   # separated by a comma (',').
      #   select_datetime(my_date_time, date_separator: '/', time_separator: '', datetime_separator: ',')
      #
      #   # Generates a datetime select that discards the type of the field and defaults to the datetime in
      #   # my_date_time (four days after today)
      #   select_datetime(my_date_time, discard_type: true)
      #
      #   # Generate a datetime field with hours in the AM/PM format
      #   select_datetime(my_date_time, ampm: true)
      #
      #   # Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
      #   # prefixed with 'payday' rather than 'date'
      #   select_datetime(my_date_time, prefix: 'payday')
      #
      #   # Generates a datetime select with a custom prompt. Use <tt>prompt: true</tt> for generic prompts.
      #   select_datetime(my_date_time, prompt: { day: 'Choose day', month: 'Choose month', year: 'Choose year' })
      #   select_datetime(my_date_time, prompt: { hour: true }) # generic prompt for hours
      #   select_datetime(my_date_time, prompt: true) # generic prompts for all
      def select_datetime(datetime = Time.current, options = {}, html_options = {})
        DateTimeSelector.new(datetime, options, html_options).select_datetime
      end

      # Returns a set of HTML select-tags (one for year, month, and day) pre-selected with the +date+.
      # It's possible to explicitly set the order of the tags using the <tt>:order</tt> option with an array of
      # symbols <tt>:year</tt>, <tt>:month</tt> and <tt>:day</tt> in the desired order.
      # If the array passed to the <tt>:order</tt> option does not contain all the three symbols, all tags will be hidden.
      #
      # If anything is passed in the html_options hash it will be applied to every select tag in the set.
      #
      #   my_date = Time.now + 6.days
      #
      #   # Generates a date select that defaults to the date in my_date (six days after today).
      #   select_date(my_date)
      #
      #   # Generates a date select that defaults to today (no specified date).
      #   select_date()
      #
      #   # Generates a date select that defaults to the date in my_date (six days after today)
      #   # with the fields ordered year, month, day rather than month, day, year.
      #   select_date(my_date, order: [:year, :month, :day])
      #
      #   # Generates a date select that discards the type of the field and defaults to the date in
      #   # my_date (six days after today).
      #   select_date(my_date, discard_type: true)
      #
      #   # Generates a date select that defaults to the date in my_date,
      #   # which has fields separated by '/'.
      #   select_date(my_date, date_separator: '/')
      #
      #   # Generates a date select that defaults to the datetime in my_date (six days after today)
      #   # prefixed with 'payday' rather than 'date'.
      #   select_date(my_date, prefix: 'payday')
      #
      #   # Generates a date select with a custom prompt. Use <tt>prompt: true</tt> for generic prompts.
      #   select_date(my_date, prompt: { day: 'Choose day', month: 'Choose month', year: 'Choose year' })
      #   select_date(my_date, prompt: { hour: true }) # generic prompt for hours
      #   select_date(my_date, prompt: true) # generic prompts for all
      def select_date(date = Date.current, options = {}, html_options = {})
        DateTimeSelector.new(date, options, html_options).select_date
      end

      # Returns a set of HTML select-tags (one for hour and minute).
      # You can set <tt>:time_separator</tt> key to format the output, and
      # the <tt>:include_seconds</tt> option to include an input for seconds.
      #
      # If anything is passed in the html_options hash it will be applied to every select tag in the set.
      #
      #   my_time = Time.now + 5.days + 7.hours + 3.minutes + 14.seconds
      #
      #   # Generates a time select that defaults to the time in my_time.
      #   select_time(my_time)
      #
      #   # Generates a time select that defaults to the current time (no specified time).
      #   select_time()
      #
      #   # Generates a time select that defaults to the time in my_time,
      #   # which has fields separated by ':'.
      #   select_time(my_time, time_separator: ':')
      #
      #   # Generates a time select that defaults to the time in my_time,
      #   # that also includes an input for seconds.
      #   select_time(my_time, include_seconds: true)
      #
      #   # Generates a time select that defaults to the time in my_time, that has fields
      #   # separated by ':' and includes an input for seconds.
      #   select_time(my_time, time_separator: ':', include_seconds: true)
      #
      #   # Generate a time select field with hours in the AM/PM format
      #   select_time(my_time, ampm: true)
      #
      #   # Generates a time select field with hours that range from 2 to 14
      #   select_time(my_time, start_hour: 2, end_hour: 14)
      #
      #   # Generates a time select with a custom prompt. Use <tt>:prompt</tt> to true for generic prompts.
      #   select_time(my_time, prompt: { day: 'Choose day', month: 'Choose month', year: 'Choose year' })
      #   select_time(my_time, prompt: { hour: true }) # generic prompt for hours
      #   select_time(my_time, prompt: true) # generic prompts for all
      def select_time(datetime = Time.current, options = {}, html_options = {})
        DateTimeSelector.new(datetime, options, html_options).select_time
      end

      # Returns a select tag with options for each of the seconds 0 through 59 with the current second selected.
      # The <tt>datetime</tt> can be either a +Time+ or +DateTime+ object or an integer.
      # Override the field name using the <tt>:field_name</tt> option, 'second' by default.
      #
      #   my_time = Time.now + 16.seconds
      #
      #   # Generates a select field for seconds that defaults to the seconds for the time in my_time.
      #   select_second(my_time)
      #
      #   # Generates a select field for seconds that defaults to the number given.
      #   select_second(33)
      #
      #   # Generates a select field for seconds that defaults to the seconds for the time in my_time
      #   # that is named 'interval' rather than 'second'.
      #   select_second(my_time, field_name: 'interval')
      #
      #   # Generates a select field for seconds with a custom prompt. Use <tt>prompt: true</tt> for a
      #   # generic prompt.
      #   select_second(14, prompt: 'Choose seconds')
      def select_second(datetime, options = {}, html_options = {})
        DateTimeSelector.new(datetime, options, html_options).select_second
      end

      # Returns a select tag with options for each of the minutes 0 through 59 with the current minute selected.
      # Also can return a select tag with options by <tt>minute_step</tt> from 0 through 59 with the 00 minute
      # selected. The <tt>datetime</tt> can be either a +Time+ or +DateTime+ object or an integer.
      # Override the field name using the <tt>:field_name</tt> option, 'minute' by default.
      #
      #   my_time = Time.now + 10.minutes
      #
      #   # Generates a select field for minutes that defaults to the minutes for the time in my_time.
      #   select_minute(my_time)
      #
      #   # Generates a select field for minutes that defaults to the number given.
      #   select_minute(14)
      #
      #   # Generates a select field for minutes that defaults to the minutes for the time in my_time
      #   # that is named 'moment' rather than 'minute'.
      #   select_minute(my_time, field_name: 'moment')
      #
      #   # Generates a select field for minutes with a custom prompt. Use <tt>prompt: true</tt> for a
      #   # generic prompt.
      #   select_minute(14, prompt: 'Choose minutes')
      def select_minute(datetime, options = {}, html_options = {})
        DateTimeSelector.new(datetime, options, html_options).select_minute
      end

      # Returns a select tag with options for each of the hours 0 through 23 with the current hour selected.
      # The <tt>datetime</tt> can be either a +Time+ or +DateTime+ object or an integer.
      # Override the field name using the <tt>:field_name</tt> option, 'hour' by default.
      #
      #   my_time = Time.now + 6.hours
      #
      #   # Generates a select field for hours that defaults to the hour for the time in my_time.
      #   select_hour(my_time)
      #
      #   # Generates a select field for hours that defaults to the number given.
      #   select_hour(13)
      #
      #   # Generates a select field for hours that defaults to the hour for the time in my_time
      #   # that is named 'stride' rather than 'hour'.
      #   select_hour(my_time, field_name: 'stride')
      #
      #   # Generates a select field for hours with a custom prompt. Use <tt>prompt: true</tt> for a
      #   # generic prompt.
      #   select_hour(13, prompt: 'Choose hour')
      #
      #   # Generate a select field for hours in the AM/PM format
      #   select_hour(my_time, ampm: true)
      #
      #   # Generates a select field that includes options for hours from 2 to 14.
      #   select_hour(my_time, start_hour: 2, end_hour: 14)
      def select_hour(datetime, options = {}, html_options = {})
        DateTimeSelector.new(datetime, options, html_options).select_hour
      end

      # Returns a select tag with options for each of the days 1 through 31 with the current day selected.
      # The <tt>date</tt> can also be substituted for a day number.
      # If you want to display days with a leading zero set the <tt>:use_two_digit_numbers</tt> key in +options+ to true.
      # Override the field name using the <tt>:field_name</tt> option, 'day' by default.
      #
      #   my_date = Time.now + 2.days
      #
      #   # Generates a select field for days that defaults to the day for the date in my_date.
      #   select_day(my_date)
      #
      #   # Generates a select field for days that defaults to the number given.
      #   select_day(5)
      #
      #   # Generates a select field for days that defaults to the number given, but displays it with two digits.
      #   select_day(5, use_two_digit_numbers: true)
      #
      #   # Generates a select field for days that defaults to the day for the date in my_date
      #   # that is named 'due' rather than 'day'.
      #   select_day(my_date, field_name: 'due')
      #
      #   # Generates a select field for days with a custom prompt. Use <tt>prompt: true</tt> for a
      #   # generic prompt.
      #   select_day(5, prompt: 'Choose day')
      def select_day(date, options = {}, html_options = {})
        DateTimeSelector.new(date, options, html_options).select_day
      end

      # Returns a select tag with options for each of the months January through December with the current month
      # selected. The month names are presented as keys (what's shown to the user) and the month numbers (1-12) are
      # used as values (what's submitted to the server). It's also possible to use month numbers for the presentation
      # instead of names -- set the <tt>:use_month_numbers</tt> key in +options+ to true for this to happen. If you
      # want both numbers and names, set the <tt>:add_month_numbers</tt> key in +options+ to true. If you would prefer
      # to show month names as abbreviations, set the <tt>:use_short_month</tt> key in +options+ to true. If you want
      # to use your own month names, set the <tt>:use_month_names</tt> key in +options+ to an array of 12 month names.
      # If you want to display months with a leading zero set the <tt>:use_two_digit_numbers</tt> key in +options+ to true.
      # Override the field name using the <tt>:field_name</tt> option, 'month' by default.
      #
      #   # Generates a select field for months that defaults to the current month that
      #   # will use keys like "January", "March".
      #   select_month(Date.today)
      #
      #   # Generates a select field for months that defaults to the current month that
      #   # is named "start" rather than "month".
      #   select_month(Date.today, field_name: 'start')
      #
      #   # Generates a select field for months that defaults to the current month that
      #   # will use keys like "1", "3".
      #   select_month(Date.today, use_month_numbers: true)
      #
      #   # Generates a select field for months that defaults to the current month that
      #   # will use keys like "1 - January", "3 - March".
      #   select_month(Date.today, add_month_numbers: true)
      #
      #   # Generates a select field for months that defaults to the current month that
      #   # will use keys like "Jan", "Mar".
      #   select_month(Date.today, use_short_month: true)
      #
      #   # Generates a select field for months that defaults to the current month that
      #   # will use keys like "Januar", "Marts."
      #   select_month(Date.today, use_month_names: %w(Januar Februar Marts ...))
      #
      #   # Generates a select field for months that defaults to the current month that
      #   # will use keys with two digit numbers like "01", "03".
      #   select_month(Date.today, use_two_digit_numbers: true)
      #
      #   # Generates a select field for months with a custom prompt. Use <tt>prompt: true</tt> for a
      #   # generic prompt.
      #   select_month(14, prompt: 'Choose month')
      def select_month(date, options = {}, html_options = {})
        DateTimeSelector.new(date, options, html_options).select_month
      end

      # Returns a select tag with options for each of the five years on each side of the current, which is selected.
      # The five year radius can be changed using the <tt>:start_year</tt> and <tt>:end_year</tt> keys in the
      # +options+. Both ascending and descending year lists are supported by making <tt>:start_year</tt> less than or
      # greater than <tt>:end_year</tt>. The <tt>date</tt> can also be substituted for a year given as a number.
      # Override the field name using the <tt>:field_name</tt> option, 'year' by default.
      #
      #   # Generates a select field for years that defaults to the current year that
      #   # has ascending year values.
      #   select_year(Date.today, start_year: 1992, end_year: 2007)
      #
      #   # Generates a select field for years that defaults to the current year that
      #   # is named 'birth' rather than 'year'.
      #   select_year(Date.today, field_name: 'birth')
      #
      #   # Generates a select field for years that defaults to the current year that
      #   # has descending year values.
      #   select_year(Date.today, start_year: 2005, end_year: 1900)
      #
      #   # Generates a select field for years that defaults to the year 2006 that
      #   # has ascending year values.
      #   select_year(2006, start_year: 2000, end_year: 2010)
      #
      #   # Generates a select field for years with a custom prompt. Use <tt>prompt: true</tt> for a
      #   # generic prompt.
      #   select_year(14, prompt: 'Choose year')
      def select_year(date, options = {}, html_options = {})
        DateTimeSelector.new(date, options, html_options).select_year
      end

      # Returns an HTML time tag for the given date or time.
      #
      #   time_tag Date.today  # =>
      #     <time datetime="2010-11-04">November 04, 2010</time>
      #   time_tag Time.now  # =>
      #     <time datetime="2010-11-04T17:55:45+01:00">November 04, 2010 17:55</time>
      #   time_tag Date.yesterday, 'Yesterday'  # =>
      #     <time datetime="2010-11-03">Yesterday</time>
      #   time_tag Date.today, pubdate: true  # =>
      #     <time datetime="2010-11-04" pubdate="pubdate">November 04, 2010</time>
      #   time_tag Date.today, datetime: Date.today.strftime('%G-W%V') # =>
      #     <time datetime="2010-W44">November 04, 2010</time>
      #
      #   <%= time_tag Time.now do %>
      #     <span>Right now</span>
      #   <% end %>
      #   # => <time datetime="2010-11-04T17:55:45+01:00"><span>Right now</span></time>
      def time_tag(date_or_time, *args, &block)
        options  = args.extract_options!
        format   = options.delete(:format) || :long
        content  = args.first || I18n.l(date_or_time, format: format)

        content_tag("time".freeze, content, options.reverse_merge(datetime: date_or_time.iso8601), &block)
      end

      private

        def normalize_distance_of_time_argument_to_time(value)
          if value.is_a?(Numeric)
            Time.at(value)
          elsif value.respond_to?(:to_time)
            value.to_time
          else
            raise ArgumentError, "#{value.inspect} can't be converted to a Time value"
          end
        end
    end

    class DateTimeSelector #:nodoc:
      include ActionView::Helpers::TagHelper

      DEFAULT_PREFIX = "date".freeze
      POSITION = {
        year: 1, month: 2, day: 3, hour: 4, minute: 5, second: 6
      }.freeze

      AMPM_TRANSLATION = Hash[
        [[0, "12 AM"], [1, "01 AM"], [2, "02 AM"], [3, "03 AM"],
         [4, "04 AM"], [5, "05 AM"], [6, "06 AM"], [7, "07 AM"],
         [8, "08 AM"], [9, "09 AM"], [10, "10 AM"], [11, "11 AM"],
         [12, "12 PM"], [13, "01 PM"], [14, "02 PM"], [15, "03 PM"],
         [16, "04 PM"], [17, "05 PM"], [18, "06 PM"], [19, "07 PM"],
         [20, "08 PM"], [21, "09 PM"], [22, "10 PM"], [23, "11 PM"]]
      ].freeze

      def initialize(datetime, options = {}, html_options = {})
        @options      = options.dup
        @html_options = html_options.dup
        @datetime     = datetime
        @options[:datetime_separator] ||= " &mdash; "
        @options[:time_separator]     ||= " : "
      end

      def select_datetime
        order = date_order.dup
        order -= [:hour, :minute, :second]
        @options[:discard_year]   ||= true unless order.include?(:year)
        @options[:discard_month]  ||= true unless order.include?(:month)
        @options[:discard_day]    ||= true if @options[:discard_month] || !order.include?(:day)
        @options[:discard_minute] ||= true if @options[:discard_hour]
        @options[:discard_second] ||= true unless @options[:include_seconds] && !@options[:discard_minute]

        set_day_if_discarded

        if @options[:tag] && @options[:ignore_date]
          select_time
        else
          [:day, :month, :year].each { |o| order.unshift(o) unless order.include?(o) }
          order += [:hour, :minute, :second] unless @options[:discard_hour]

          build_selects_from_types(order)
        end
      end

      def select_date
        order = date_order.dup

        @options[:discard_hour]     = true
        @options[:discard_minute]   = true
        @options[:discard_second]   = true

        @options[:discard_year]   ||= true unless order.include?(:year)
        @options[:discard_month]  ||= true unless order.include?(:month)
        @options[:discard_day]    ||= true if @options[:discard_month] || !order.include?(:day)

        set_day_if_discarded

        [:day, :month, :year].each { |o| order.unshift(o) unless order.include?(o) }

        build_selects_from_types(order)
      end

      def select_time
        order = []

        @options[:discard_month]    = true
        @options[:discard_year]     = true
        @options[:discard_day]      = true
        @options[:discard_second] ||= true unless @options[:include_seconds]

        order += [:year, :month, :day] unless @options[:ignore_date]

        order += [:hour, :minute]
        order << :second if @options[:include_seconds]

        build_selects_from_types(order)
      end

      def select_second
        if @options[:use_hidden] || @options[:discard_second]
          build_hidden(:second, sec) if @options[:include_seconds]
        else
          build_options_and_select(:second, sec)
        end
      end

      def select_minute
        if @options[:use_hidden] || @options[:discard_minute]
          build_hidden(:minute, min)
        else
          build_options_and_select(:minute, min, step: @options[:minute_step])
        end
      end

      def select_hour
        if @options[:use_hidden] || @options[:discard_hour]
          build_hidden(:hour, hour)
        else
          options         = {}
          options[:ampm]  = @options[:ampm] || false
          options[:start] = @options[:start_hour] || 0
          options[:end]   = @options[:end_hour] || 23
          build_options_and_select(:hour, hour, options)
        end
      end

      def select_day
        if @options[:use_hidden] || @options[:discard_day]
          build_hidden(:day, day || 1)
        else
          build_options_and_select(:day, day, start: 1, end: 31, leading_zeros: false, use_two_digit_numbers: @options[:use_two_digit_numbers])
        end
      end

      def select_month
        if @options[:use_hidden] || @options[:discard_month]
          build_hidden(:month, month || 1)
        else
          month_options = []
          1.upto(12) do |month_number|
            options = { value: month_number }
            options[:selected] = "selected" if month == month_number
            month_options << content_tag("option".freeze, month_name(month_number), options) + "\n"
          end
          build_select(:month, month_options.join)
        end
      end

      def select_year
        if !@datetime || @datetime == 0
          val = "1"
          middle_year = Date.today.year
        else
          val = middle_year = year
        end

        if @options[:use_hidden] || @options[:discard_year]
          build_hidden(:year, val)
        else
          options                     = {}
          options[:start]             = @options[:start_year] || middle_year - 5
          options[:end]               = @options[:end_year] || middle_year + 5
          options[:step]              = options[:start] < options[:end] ? 1 : -1
          options[:leading_zeros]     = false
          options[:max_years_allowed] = @options[:max_years_allowed] || 1000

          if (options[:end] - options[:start]).abs > options[:max_years_allowed]
            raise ArgumentError, "There are too many years options to be built. Are you sure you haven't mistyped something? You can provide the :max_years_allowed parameter."
          end

          build_select(:year, build_year_options(val, options))
        end
      end

      private
        %w( sec min hour day month year ).each do |method|
          define_method(method) do
            case @datetime
            when Hash then @datetime[method.to_sym]
            when Numeric then @datetime
            when nil then nil
            else @datetime.send(method)
            end
          end
        end

        # If the day is hidden, the day should be set to the 1st so all month and year choices are
        # valid. Otherwise, February 31st or February 29th, 2011 can be selected, which are invalid.
        def set_day_if_discarded
          if @datetime && @options[:discard_day]
            @datetime = @datetime.change(day: 1)
          end
        end

        # Returns translated month names, but also ensures that a custom month
        # name array has a leading +nil+ element.
        def month_names
          @month_names ||= begin
            month_names = @options[:use_month_names] || translated_month_names
            month_names.unshift(nil) if month_names.size < 13
            month_names
          end
        end

        # Returns translated month names.
        #  => [nil, "January", "February", "March",
        #           "April", "May", "June", "July",
        #           "August", "September", "October",
        #           "November", "December"]
        #
        # If <tt>:use_short_month</tt> option is set
        #  => [nil, "Jan", "Feb", "Mar", "Apr", "May", "Jun",
        #           "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
        def translated_month_names
          key = @options[:use_short_month] ? :'date.abbr_month_names' : :'date.month_names'
          I18n.translate(key, locale: @options[:locale])
        end

        # Looks up month names by number (1-based):
        #
        #   month_name(1) # => "January"
        #
        # If the <tt>:use_month_numbers</tt> option is passed:
        #
        #   month_name(1) # => 1
        #
        # If the <tt>:use_two_month_numbers</tt> option is passed:
        #
        #   month_name(1) # => '01'
        #
        # If the <tt>:add_month_numbers</tt> option is passed:
        #
        #   month_name(1) # => "1 - January"
        #
        # If the <tt>:month_format_string</tt> option is passed:
        #
        #   month_name(1) # => "January (01)"
        #
        # depending on the format string.
        def month_name(number)
          if @options[:use_month_numbers]
            number
          elsif @options[:use_two_digit_numbers]
            "%02d" % number
          elsif @options[:add_month_numbers]
            "#{number} - #{month_names[number]}"
          elsif format_string = @options[:month_format_string]
            format_string % { number: number, name: month_names[number] }
          else
            month_names[number]
          end
        end

        # Looks up year names by number.
        #
        #   year_name(1998) # => 1998
        #
        # If the <tt>:year_format</tt> option is passed:
        #
        #   year_name(1998) # => "Heisei 10"
        def year_name(number)
          if year_format_lambda = @options[:year_format]
            year_format_lambda.call(number)
          else
            number
          end
        end

        def date_order
          @date_order ||= @options[:order] || translated_date_order
        end

        def translated_date_order
          date_order = I18n.translate(:'date.order', locale: @options[:locale], default: [])
          date_order = date_order.map(&:to_sym)

          forbidden_elements = date_order - [:year, :month, :day]
          if forbidden_elements.any?
            raise StandardError,
              "#{@options[:locale]}.date.order only accepts :year, :month and :day"
          end

          date_order
        end

        # Build full select tag from date type and options.
        def build_options_and_select(type, selected, options = {})
          build_select(type, build_options(selected, options))
        end

        # Build select option HTML from date value and options.
        #  build_options(15, start: 1, end: 31)
        #  => "<option value="1">1</option>
        #      <option value="2">2</option>
        #      <option value="3">3</option>..."
        #
        # If <tt>use_two_digit_numbers: true</tt> option is passed
        #  build_options(15, start: 1, end: 31, use_two_digit_numbers: true)
        #  => "<option value="1">01</option>
        #      <option value="2">02</option>
        #      <option value="3">03</option>..."
        #
        # If <tt>:step</tt> options is passed
        #  build_options(15, start: 1, end: 31, step: 2)
        #  => "<option value="1">1</option>
        #      <option value="3">3</option>
        #      <option value="5">5</option>..."
        def build_options(selected, options = {})
          options = {
            leading_zeros: true, ampm: false, use_two_digit_numbers: false
          }.merge!(options)

          start         = options.delete(:start) || 0
          stop          = options.delete(:end) || 59
          step          = options.delete(:step) || 1
          leading_zeros = options.delete(:leading_zeros)

          select_options = []
          start.step(stop, step) do |i|
            value = leading_zeros ? sprintf("%02d", i) : i
            tag_options = { value: value }
            tag_options[:selected] = "selected" if selected == i
            text = options[:use_two_digit_numbers] ? sprintf("%02d", i) : value
            text = options[:ampm] ? AMPM_TRANSLATION[i] : text
            select_options << content_tag("option".freeze, text, tag_options)
          end

          (select_options.join("\n") + "\n").html_safe
        end

        # Build select option HTML for year.
        # If <tt>year_format</tt> option is not passed
        #  build_year_options(1998, start: 1998, end: 2000)
        #  => "<option value="1998" selected="selected">1998</option>
        #      <option value="1999">1999</option>
        #      <option value="2000">2000</option>"
        #
        # If <tt>year_format</tt> option is passed
        #  build_year_options(1998, start: 1998, end: 2000, year_format: ->year { "Heisei #{ year - 1988 }" })
        #  => "<option value="1998" selected="selected">Heisei 10</option>
        #      <option value="1999">Heisei 11</option>
        #      <option value="2000">Heisei 12</option>"
        def build_year_options(selected, options = {})
          start = options.delete(:start)
          stop = options.delete(:end)
          step = options.delete(:step)

          select_options = []
          start.step(stop, step) do |value|
            tag_options = { value: value }
            tag_options[:selected] = "selected" if selected == value
            text = year_name(value)
            select_options << content_tag("option".freeze, text, tag_options)
          end

          (select_options.join("\n") + "\n").html_safe
        end

        # Builds select tag from date type and HTML select options.
        #  build_select(:month, "<option value="1">January</option>...")
        #  => "<select id="post_written_on_2i" name="post[written_on(2i)]">
        #        <option value="1">January</option>...
        #      </select>"
        def build_select(type, select_options_as_html)
          select_options = {
            id: input_id_from_type(type),
            name: input_name_from_type(type)
          }.merge!(@html_options)
          select_options[:disabled] = "disabled" if @options[:disabled]
          select_options[:class] = css_class_attribute(type, select_options[:class], @options[:with_css_classes]) if @options[:with_css_classes]

          select_html = "\n".dup
          select_html << content_tag("option".freeze, "", value: "") + "\n" if @options[:include_blank]
          select_html << prompt_option_tag(type, @options[:prompt]) + "\n" if @options[:prompt]
          select_html << select_options_as_html

          (content_tag("select".freeze, select_html.html_safe, select_options) + "\n").html_safe
        end

        # Builds the css class value for the select element
        #  css_class_attribute(:year, 'date optional', { year: 'my-year' })
        #  => "date optional my-year"
        def css_class_attribute(type, html_options_class, options) # :nodoc:
          css_class = \
            case options
            when Hash
              options[type.to_sym]
            else
              type
            end

          [html_options_class, css_class].compact.join(" ")
        end

        # Builds a prompt option tag with supplied options or from default options.
        #  prompt_option_tag(:month, prompt: 'Select month')
        #  => "<option value="">Select month</option>"
        def prompt_option_tag(type, options)
          prompt = \
            case options
            when Hash
              default_options = { year: false, month: false, day: false, hour: false, minute: false, second: false }
              default_options.merge!(options)[type.to_sym]
            when String
              options
            else
              I18n.translate(:"datetime.prompts.#{type}", locale: @options[:locale])
            end

          prompt ? content_tag("option".freeze, prompt, value: "") : ""
        end

        # Builds hidden input tag for date part and value.
        #  build_hidden(:year, 2008)
        #  => "<input id="post_written_on_1i" name="post[written_on(1i)]" type="hidden" value="2008" />"
        def build_hidden(type, value)
          select_options = {
            type: "hidden",
            id: input_id_from_type(type),
            name: input_name_from_type(type),
            value: value
          }.merge!(@html_options.slice(:disabled))
          select_options[:disabled] = "disabled" if @options[:disabled]

          tag(:input, select_options) + "\n".html_safe
        end

        # Returns the name attribute for the input tag.
        #  => post[written_on(1i)]
        def input_name_from_type(type)
          prefix = @options[:prefix] || ActionView::Helpers::DateTimeSelector::DEFAULT_PREFIX
          prefix += "[#{@options[:index]}]" if @options.has_key?(:index)

          field_name = @options[:field_name] || type.to_s
          if @options[:include_position]
            field_name += "(#{ActionView::Helpers::DateTimeSelector::POSITION[type]}i)"
          end

          @options[:discard_type] ? prefix : "#{prefix}[#{field_name}]"
        end

        # Returns the id attribute for the input tag.
        #  => "post_written_on_1i"
        def input_id_from_type(type)
          id = input_name_from_type(type).gsub(/([\[\(])|(\]\[)/, "_").gsub(/[\]\)]/, "")
          id = @options[:namespace] + "_" + id if @options[:namespace]

          id
        end

        # Given an ordering of datetime components, create the selection HTML
        # and join them with their appropriate separators.
        def build_selects_from_types(order)
          select = "".dup
          first_visible = order.find { |type| !@options[:"discard_#{type}"] }
          order.reverse_each do |type|
            separator = separator(type) unless type == first_visible # don't add before first visible field
            select.insert(0, separator.to_s + send("select_#{type}").to_s)
          end
          select.html_safe
        end

        # Returns the separator for a given datetime component.
        def separator(type)
          return "" if @options[:use_hidden]

          case type
          when :year, :month, :day
            @options[:"discard_#{type}"] ? "" : @options[:date_separator]
          when :hour
            (@options[:discard_year] && @options[:discard_day]) ? "" : @options[:datetime_separator]
          when :minute, :second
            @options[:"discard_#{type}"] ? "" : @options[:time_separator]
          end
        end
    end

    class FormBuilder
      # Wraps ActionView::Helpers::DateHelper#date_select for form builders:
      #
      #   <%= form_for @person do |f| %>
      #     <%= f.date_select :birth_date %>
      #     <%= f.submit %>
      #   <% end %>
      #
      # Please refer to the documentation of the base helper for details.
      def date_select(method, options = {}, html_options = {})
        @template.date_select(@object_name, method, objectify_options(options), html_options)
      end

      # Wraps ActionView::Helpers::DateHelper#time_select for form builders:
      #
      #   <%= form_for @race do |f| %>
      #     <%= f.time_select :average_lap %>
      #     <%= f.submit %>
      #   <% end %>
      #
      # Please refer to the documentation of the base helper for details.
      def time_select(method, options = {}, html_options = {})
        @template.time_select(@object_name, method, objectify_options(options), html_options)
      end

      # Wraps ActionView::Helpers::DateHelper#datetime_select for form builders:
      #
      #   <%= form_for @person do |f| %>
      #     <%= f.datetime_select :last_request_at %>
      #     <%= f.submit %>
      #   <% end %>
      #
      # Please refer to the documentation of the base helper for details.
      def datetime_select(method, options = {}, html_options = {})
        @template.datetime_select(@object_name, method, objectify_options(options), html_options)
      end
    end
  end
end