# frozen_string_literal: true

require_relative '../../const/number'

# :nodoc:
module Zakuro
  # :nodoc:
  module Version
    # :nodoc:
    module Daien
      # :nodoc:
      module Lunar
        #
        # Adjustment 補正値情報
        #
        module Adjustment
          # 『歴代天文律暦等志彙編　七』中華書房 p.2230
          #
          # 遠/近の地点での中間
          #
          # @return [Hash<Integer>] 遠/近の地点での中間
          DAY_LIMIT = {
            7 => 2701,
            14 => 2363,
            21 => 2024,
            28 => 1686
          }.freeze

          #
          # Row 行情報
          #
          class Row
            # @return [Integer] 入暦（1-14）
            attr_reader :day
            # @return [Range] 小余範囲
            attr_reader :range
            # @return [Value] 補正値
            attr_reader :value

            #
            # 初期化
            #
            # @param [Integer] day 入暦（1-14）
            # @param [Range] range 小余範囲
            # @param [Value] value 補正値
            #
            def initialize(day:, range:, value:)
              @day = day
              @range = range
              @value = value
            end

            # :reek:ControlParameter

            #
            # 一致するか
            #
            # @param [Integer] day 入暦（1-14）
            # @param [Integer] minute 小余
            #
            # @return [True] 一致
            # @return [False] 不一致
            #
            def match?(day:, minute:)
              inner_day = @day
              return false unless inner_day == day

              return false unless range.include?(minute: minute)

              true
            end

            #
            # 分母を返す
            #
            # @return [Integer] 分母
            #
            def denominator
              range.denominator
            end
          end

          #
          # Range 小余範囲
          #
          class Range
            # @return [Integer] 下限
            MIN = 0
            # @return [Integer] 上限
            MAX = Const::Number::Cycle::DAY

            # @return [Integer] 下限
            attr_reader :min
            # @return [Integer] 上限
            attr_reader :max

            #
            # 初期化
            #
            # @param [Integer] min 下限
            # @param [Integer] max 上限
            #
            def initialize(min: MIN, max: MAX)
              @min = min
              @max = max
            end

            #
            # 含まれるか
            #
            # @param [Integer] minute 小余
            #
            # @return [True] 含まれる
            # @return [False] 含まれない
            #
            def include?(minute:)
              minute >= min && minute <= max
            end

            #
            # 分母を返す
            #
            # @return [Integer] 分母
            #
            def denominator
              max - min
            end
          end

          #
          # Value 補正値
          #
          class Value
            # @return [Integer] 増減率
            attr_reader :per
            # @return [Integer] 遅速積
            attr_reader :stack

            #
            # 初期化
            #
            # @param [Integer] per 増減率
            # @param [Integer] stack 遅速積
            #
            def initialize(per:, stack:)
              @per = per
              @stack = stack
            end

            #
            # 文字化
            #
            # @return [String] 文字
            #
            def to_s
              "per:#{per}, stack:#{stack}"
            end
          end

          # rubocop:disable Layout/LineLength

          # 『歴代天文律暦等志彙編　七』中華書房 p.2228-2230
          #
          # @note 7日、14日、21日、28日の小余は DAY_LIMIT を参照のこと
          #
          # @return [Array<Row>] 月の補正値情報
          #
          LIST = [
            Row.new(day: 1, range: Range.new, value: Value.new(per: +297, stack: 0)),
            Row.new(day: 2, range: Range.new, value: Value.new(per: +259, stack: +297)),
            Row.new(day: 3, range: Range.new, value: Value.new(per: +220, stack: +556)),
            Row.new(day: 4, range: Range.new, value: Value.new(per: +180, stack: +776)),
            Row.new(day: 5, range: Range.new, value: Value.new(per: +139, stack: +956)),
            Row.new(day: 6, range: Range.new, value: Value.new(per: +97, stack: +1095)),
            Row.new(day: 7, range: Range.new(max: DAY_LIMIT[7]), value: Value.new(per: +48, stack: +1192)),
            Row.new(day: 7, range: Range.new(min: DAY_LIMIT[7]), value: Value.new(per: -6, stack: +1240)), # stack: +1192 + 48
            Row.new(day: 8, range: Range.new, value: Value.new(per: -64, stack: +1234)),
            Row.new(day: 9, range: Range.new, value: Value.new(per: -106, stack: +1170)),
            Row.new(day: 10, range: Range.new, value: Value.new(per: -148, stack: +1064)),
            Row.new(day: 11, range: Range.new, value: Value.new(per: -189, stack: +916)),
            Row.new(day: 12, range: Range.new, value: Value.new(per: -229, stack: +727)),
            Row.new(day: 13, range: Range.new, value: Value.new(per: -267, stack: +498)),
            Row.new(day: 14, range: Range.new(max: DAY_LIMIT[14]), value: Value.new(per: -231, stack: +231)),
            Row.new(day: 14, range: Range.new(min: DAY_LIMIT[14]), value: Value.new(per: -66, stack: 0)), # stack: +232 - 231
            Row.new(day: 15, range: Range.new, value: Value.new(per: -289, stack: -66)),
            Row.new(day: 16, range: Range.new, value: Value.new(per: -250, stack: -355)),
            Row.new(day: 17, range: Range.new, value: Value.new(per: -211, stack: -605)),
            Row.new(day: 18, range: Range.new, value: Value.new(per: -171, stack: -816)),
            Row.new(day: 19, range: Range.new, value: Value.new(per: -130, stack: -987)),
            Row.new(day: 20, range: Range.new, value: Value.new(per: -87, stack: -1117)),
            Row.new(day: 21, range: Range.new(max: DAY_LIMIT[21]), value: Value.new(per: -36, stack: -1204)),
            Row.new(day: 21, range: Range.new(min: DAY_LIMIT[21]), value: Value.new(per: +18, stack: -1240)), # stack: -1204 - 36
            Row.new(day: 22, range: Range.new, value: Value.new(per: +73, stack: -1222)),
            Row.new(day: 23, range: Range.new, value: Value.new(per: +116, stack: -1149)),
            Row.new(day: 24, range: Range.new, value: Value.new(per: +157, stack: -1033)),
            Row.new(day: 25, range: Range.new, value: Value.new(per: +198, stack: -876)),
            Row.new(day: 26, range: Range.new, value: Value.new(per: +237, stack: -678)),
            Row.new(day: 27, range: Range.new, value: Value.new(per: +276, stack: -441)),
            Row.new(day: 28, range: Range.new(max: DAY_LIMIT[28]), value: Value.new(per: +165, stack: -165))
          ].freeze
          # rubocop:enable Layout/LineLength

          class << self
            #
            # 月軌道の補正に必要な基本値を引き当てる
            #
            # @param [True, False] forward 進（遠地点より数える）/退（近地点より数える）
            # @param [Integer] day 大余
            # @param [Integer] minute 小余
            #
            # @return [Row] 補正値
            #
            # @raise [ArgumentError] 引数エラー
            #
            def specify(day:, minute:)
              LIST.each do |row|
                # NOTE: 範囲が重複している場合、最初に引き当てたほうを優先する
                return row if row.match?(day: day, minute: minute)
              end

              raise ArgumentError.new, "invalid parameter: #{day}/#{minute}"
            end

            # :reek:ControlParameter

            #
            # 小余の下げ幅を求める
            #
            # @param [Integer] day 大余
            # @param [Integer] minute 小余
            #
            # @return [Integer] 小余の下げ幅
            #
            def minus_minute(day:, minute:)
              limit = DAY_LIMIT.fetch(day, -1)
              # 該当なし
              return minute if limit == -1

              return minute unless minute > limit

              minute - limit
            end
          end
        end
      end
    end
  end
end