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#!/usr/bin/awk
#
# See ../README.md
#
#
# Run as: awk -f ch-1.awk < input-file
#
#
# We're reading years from standard input, one year per line, outputting
# years from the sexagenary cycle [1]. This is slightly more than what
# the challenge ask; the challenge asks to output the heavenly stem [2],
# and the earthly branch [3]. But we also output its Yin/Yang.
#
# [1] https://en.wikipedia.org/wiki/Sexagenary_cycle
# [2] https://en.wikipedia.org/wiki/Heavenly_Stems
# [3] https://en.wikipedia.org/wiki/Earthly_Branches
#
#
# Each of the cycles have been rotated so the first entry corresponds to
# the year 0 in the Proleptic Gregorian calendar. (We're using the
# convention of having a year 0, as per ISO 8601).
# That way, we can just mod the year with the number of entries, without
# first having to subtract something from the year.
#
# The heavenly stems last for 2 years, so we just duplicate the entries.
#
BEGIN {
yin_yang [ 0] = "Yang"
yin_yang [ 1] = "Yin"
yin_yang_size = 2
heavenly_stems [ 0] = "Metal"
heavenly_stems [ 1] = "Metal"
heavenly_stems [ 2] = "Water"
heavenly_stems [ 3] = "Water"
heavenly_stems [ 4] = "Wood"
heavenly_stems [ 5] = "Wood"
heavenly_stems [ 6] = "Fire"
heavenly_stems [ 7] = "Fire"
heavenly_stems [ 8] = "Earth"
heavenly_stems [ 9] = "Earth"
heavenly_stems_size = 10
earthly_branches [ 0] = "Monkey"
earthly_branches [ 1] = "Rooster"
earthly_branches [ 2] = "Dog"
earthly_branches [ 3] = "Pig"
earthly_branches [ 4] = "Rat"
earthly_branches [ 5] = "Ox"
earthly_branches [ 6] = "Tiger"
earthly_branches [ 7] = "Rabbit"
earthly_branches [ 8] = "Dragon"
earthly_branches [ 9] = "Snake"
earthly_branches [10] = "Horse"
earthly_branches [11] = "Goat"
earthly_branches_size = 12
}
{
print yin_yang [$1 % yin_yang_size], \
heavenly_stems [$1 % heavenly_stems_size], \
earthly_branches [$1 % earthly_branches_size]
}
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