class Nengo

# File lib/nengo.rb, line 16
def initialize(year = nil)
  year = year.nil? ? current_year_seireki : year
  @jidai_data = load_jidai_data
  set_by_seireki(year)
end

# File lib/nengo.rb, line 31
def current_year_seireki
  Time.now.year
end

# File lib/nengo.rb, line 104
def eto_first_three(year_seireki)
  case year_seireki
  when 1
    58
  when 2
    59
  when 3
    60
  else
    raise "入力された年が無効です"
  end
end

# File lib/nengo.rb, line 78
def get_animal_eto(year_rel)
  year_animal = year_rel == 10 ? year_rel : (year_rel % 10) + 1
  animal_list_eto = JSON.parse(File.read(ANIMAL_LIST_ETO_PATH))
  year_animal = animal_list_eto.select { |hash| hash["id"] == year_animal }.first
  year_animal
end

# File lib/nengo.rb, line 59
def get_data_eto(year_seireki)
  data_eto = {}
  year_rel = get_year_eto(year_seireki)
  data_eto[:year_rel] = year_rel
  data_eto[:animal] = get_animal_eto(year_rel)
  data_eto[:element] = get_element_eto(year_rel)
  data_eto
end

# File lib/nengo.rb, line 53
def get_data_nengo(year_seireki)
  data_nengo = @jidai_data.select { |jidai| jidai["begin_yr"] <= year_seireki && jidai["end_yr"] >= year_seireki }.first
  data_nengo["year_rel"] = year_seireki - data_nengo["begin_yr"] + 1
  data_nengo
end

# File lib/nengo.rb, line 85
def get_element_eto(year_rel)
  year_element = year_rel == 12 ? year_rel : year_rel % 12
  element_list_eto = JSON.parse(File.read(ELEMENT_LIST_ETO_PATH))
  element_list_eto.select { |hash| hash["id"] == year_element }.first
end

# File lib/nengo.rb, line 95
def get_koki(year_seireki)
  year_seireki + 660
end

# File lib/nengo.rb, line 91
def get_nenrei(year_seireki)
  current_year_seireki - year_seireki
end

# File lib/nengo.rb, line 68
def get_year_eto(year_seireki)
  if year_seireki >= 4
    (year_seireki - 3) % 60
  elsif year_seireki < 0
    60 - ((year_seireki + 2) % 60)
  else
    eto_first_three(year_seireki)
  end
end

# File lib/nengo.rb, line 99
def nengo_to_seireki(data_nengo)
  current_jidai = @jidai_data.select { |jidai_hash| jidai_hash["name"] == data_nengo[:jidai] }.first
  current_jidai["begin_yr"].to_i + data_nengo[:year_rel] - 1
end

# File lib/nengo.rb, line 47
def set_by_koki(koki)
  @year_seireki = koki - 660
  set_by_seireki(@year_seireki)
  true
end

# File lib/nengo.rb, line 35
def set_by_nengo(nengo_data)
  @year_seireki = nengo_to_seireki(nengo_data)
  set_by_seireki(@year_seireki)
  true
end

# File lib/nengo.rb, line 41
def set_by_nenrei(nenrei)
  @year_seireki = current_year_seireki - nenrei
  set_by_seireki(@year_seireki)
  true
end

# File lib/nengo.rb, line 22
def set_by_seireki(year_seireki)
  @year_seireki = year_seireki
  @data_nengo = get_data_nengo(@year_seireki)
  @nenrei = get_nenrei(@year_seireki)
  @data_eto = get_data_eto(@year_seireki)
  @year_koki = get_koki(@year_seireki)
  true
end

# File lib/nengo.rb, line 118
def load_jidai_data
  jidai_data_file = File.read(JIDAI_DATA_PATH)
  JSON.parse(jidai_data_file)
end