# frozen_string_literal: true

module BCDice
  module GameSystem
    class Ryutama < Base
      # ゲームシステムの識別子
      ID = 'Ryutama'

      # ゲームシステム名
      NAME = 'りゅうたま'

      # ゲームシステム名の読みがな
      SORT_KEY = 'りゆうたま'

      # ダイスボットの使い方
      HELP_MESSAGE = <<~INFO_MESSAGE_TEXT
        ・判定
        　Rx,y>=t（x,y：使用する能力値、t：目標値）
        　1ゾロ、クリティカルも含めて判定結果を表示します
        　能力値１つでの判定は Rx>=t で行えます
        例）R8,6>=13
      INFO_MESSAGE_TEXT

      register_prefix('R')

      def initialize(command)
        super(command)
        @validDiceTypes = [20, 12, 10, 8, 6, 4, 2]
      end

      def eval_game_system_specific_command(command)
        debug('eval_game_system_specific_command begin')

        unless command =~ /^R(\d+)(,(\d+))?([+\-\d]+)?(>=(\d+))?/
          debug('unmatched!')
          return ''
        end
        debug('matched')

        dice1 = Regexp.last_match(1).to_i
        dice2 = Regexp.last_match(3).to_i
        modifyString = Regexp.last_match(4)
        difficulty = Regexp.last_match(6)

        dice1, dice2 = getDiceType(dice1, dice2)
        if dice1 == 0
          return ''
        end

        modifyString ||= ''
        modify = ArithmeticEvaluator.eval(modifyString)
        difficulty = getDiffculty(difficulty)

        value1 = getRollValue(dice1)
        value2 = getRollValue(dice2)
        total = value1 + value2 + modify

        result = getResultText(value1, value2, dice1, dice2, difficulty, total)
        unless result.empty?
          result = " ＞ #{result}"
        end

        value1Text = "#{value1}(#{dice1})"
        value2Text = (value2 == 0 ? "" : "+#{value2}(#{dice2})")
        modifyText = getModifyString(modify)

        baseText = getBaseText(dice1, dice2, modify, difficulty)
        output = "(#{baseText}) ＞ #{value1Text}#{value2Text}#{modifyText} ＞ #{total}#{result}"
        return output
      end

      def getDiceType(dice1, dice2)
        debug('getDiceType begin')

        if dice2 != 0
          if isValidDiceOne(dice1)
            return dice1, dice2
          else
            return 0, 0
          end
        end

        if isValidDice(dice1, dice2)
          return dice1, dice2
        end

        diceBase = dice1

        dice1 = diceBase / 10
        dice2 = diceBase % 10

        if isValidDice(dice1, dice2)
          return dice1, dice2
        end

        dice1 = diceBase / 100
        dice2 = diceBase % 100

        if isValidDice(dice1, dice2)
          return dice1, dice2
        end

        if isValidDiceOne(diceBase)
          return diceBase, 0
        end

        return 0, 0
      end

      def isValidDice(dice1, dice2)
        return isValidDiceOne(dice1) &&
               isValidDiceOne(dice2)
      end

      def isValidDiceOne(dice)
        @validDiceTypes.include?(dice)
      end

      def getDiffculty(difficulty)
        unless difficulty.nil?
          difficulty = difficulty.to_i
        end

        return difficulty
      end

      def getRollValue(dice)
        return 0 if dice == 0

        value = @randomizer.roll_once(dice)
        return value
      end

      def getResultText(value1, value2, dice1, dice2, difficulty, total)
        if isFamble(value1, value2)
          return "１ゾロ【１ゾロポイント＋１】"
        end

        if isCritical(value1, value2, dice1, dice2)
          return "クリティカル成功"
        end

        if difficulty.nil?
          return ''
        end

        if total >= difficulty
          return "成功"
        end

        return "失敗"
      end

      def isFamble(value1, value2)
        return (value1 == 1) && (value2 == 1)
      end

      def isCritical(value1, value2, dice1, dice2)
        return false if value2 == 0

        if (value1 == 6) && (value2 == 6)
          return true
        end

        if (value1 == dice1) && (value2 == dice2)
          return true
        end

        return false
      end

      def getBaseText(dice1, dice2, modify, difficulty)
        baseText = "R#{dice1}"

        if dice2 != 0
          baseText += ",#{dice2}"
        end

        baseText += getModifyString(modify)

        unless difficulty.nil?
          baseText += ">=#{difficulty}"
        end

        return baseText
      end

      def getModifyString(modify)
        if modify > 0
          return "+" + modify.to_s
        elsif modify < 0
          return modify.to_s
        end

        return ''
      end
    end
  end
end
