module Jkf::Parser
  # Intersection of KIF and KI2
  module Kifuable
    protected

    # initialboard : (" " nonls nl)? ("+" nonls nl)? ikkatsuline+ ("+" nonls nl)?
    def parse_initialboard
      s0 = s1 = @current_pos
      if match_space != :failed
        parse_nonls
        s2 = parse_nl
        @current_pos = s1 if s2 == :failed
      else
        @current_pos = s1
      end
      s2 = @current_pos
      if match_str("+") != :failed
        parse_nonls
        @current_pos = s2 if parse_nl == :failed
      else
        @current_pos = s2
      end
      s4 = parse_ikkatsuline
      if s4 != :failed
        s3 = []
        while s4 != :failed
          s3 << s4
          s4 = parse_ikkatsuline
        end
      else
        s3 = :failed
      end
      if s3 != :failed
        s4 = @current_pos
        if match_str("+") != :failed
          parse_nonls
          @current_pos = s4 if parse_nl == :failed
        else
          @current_pos = s4
        end
        @reported_pos = s0
        transform_initialboard(s3)
      else
        @current_pos = s0
        :failed
      end
    end

    # ikkatsuline : "|" masu:masu+ "|" nonls! nl
    def parse_ikkatsuline
      s0 = @current_pos
      if match_str("|") != :failed
        s3 = parse_masu
        if s3 != :failed
          s2 = []
          while s3 != :failed
            s2 << s3
            s3 = parse_masu
          end
        else
          s2 = :failed
        end
        if s2 != :failed
          if match_str("|") != :failed
            s4 = parse_nonls!
            if s4 != :failed
              if parse_nl != :failed
                @reported_pos = s0
                s0 = s2
              else
                @current_pos = s0
                s0 = :failed
              end
            else
              @current_pos = s0
              s0 = :failed
            end
          else
            @current_pos = s0
            s0 = :failed
          end
        else
          @current_pos = s0
          s0 = :failed
        end
      else
        @current_pos = s0
        s0 = :failed
      end

      s0
    end

    # masu : teban piece | " ・"
    def parse_masu
      s0 = @current_pos
      s1 = parse_teban
      if s1 != :failed
        s2 = parse_piece
        if s2 != :failed
          @reported_pos = s0
          s0 = { "color" => s1, "kind" => s2 }
        else
          @current_pos = s0
          s0 = :failed
        end
      else
        @current_pos = s0
        s0 = :failed
      end
      if s0 == :failed
        s0 = @current_pos
        s1 = match_str(" ・")
        if s1 != :failed
          @reported_pos = s0
          s1 = {}
        end
        s0 = s1
      end

      s0
    end

    # teban : (" " | "+" | "^") | ("v" | "V")
    def parse_teban
      s0 = @current_pos
      s1 = match_space
      if s1 == :failed
        s1 = match_str("+")
        s1 = match_str("^") if s1 == :failed
      end
      if s1 != :failed
        @reported_pos = s0
        s1 = 0
      end
      s0 = s1
      if s0 == :failed
        s0 = @current_pos
        s1 = match_str("v")
        s1 = match_str("V") if s1 == :failed
        if s1 != :failed
          @reported_pos = s0
          s1 = 1
        end
        s0 = s1
      end
      s0
    end

    # pointer : "&" nonls nl
    def parse_pointer
      s0 = @current_pos
      s1 = match_str("&")
      if s1 != :failed
        s2 = parse_nonls
        s3 = parse_nl
        if s3 != :failed
          s0 = [s1, s2, s3]
        else
          @current_pos = s0
          s0 = :failed
        end
      else
        @current_pos = s0
        s0 = :failed
      end
      s0
    end

    # num : [１２３４５６７８９]
    def parse_num
      s0 = @current_pos
      s1 = match_regexp(/^[１２３４５６７８９]/)
      if s1 != :failed
        @reported_pos = s0
        s1 = zen2n(s1)
      end
      s1
    end

    # numkan : [一二三四五六七八九]
    def parse_numkan
      s0 = @current_pos
      s1 = match_regexp(/^[一二三四五六七八九]/)
      if s1 != :failed
        @reported_pos = s0
        s1 = kan2n(s1)
      end
      s1
    end

    # piece : "成"? [歩香桂銀金角飛王玉と杏圭全馬竜龍]
    def parse_piece
      s0 = @current_pos
      s1 = match_str("成")
      s1 = "" if s1 == :failed
      s2 = match_regexp(/^[歩香桂銀金角飛王玉と杏圭全馬竜龍]/)
      if s2 != :failed
        @reported_pos = s0
        kind2csa(s1 + s2)
      else
        @current_pos = s0
        :failed
      end
    end

    # result : "まで" [0-9]+ "手" (
    #            "で" (turn "手の" (result_toryo | result_illegal)) |
    #            result_timeup | result_chudan | result_jishogi |
    #            result_sennichite | result_tsumi | result_fuzumi
    #          ) nl
    def parse_result
      s0 = @current_pos
      if match_str("まで") != :failed
        s2 = match_digits!
        if s2 != :failed
          if match_str("手") != :failed
            s4 = @current_pos
            if match_str("で") != :failed
              if parse_turn != :failed
                if match_str("手の") != :failed
                  s8 = parse_result_toryo
                  s8 = parse_result_illegal if s8 == :failed
                  s4 = if s8 != :failed
                         @reported_pos = s4
                         s8
                       else
                         @current_pos = s4
                         :failed
                       end
                else
                  @current_pos = s4
                  s4 = :failed
                end
              else
                @current_pos = s4
                s4 = :failed
              end
            else
              @current_pos = s4
              s4 = :failed
            end
            if s4 == :failed
              s4 = parse_result_timeup
              if s4 == :failed
                s4 = parse_result_chudan
                if s4 == :failed
                  s4 = parse_result_jishogi
                  if s4 == :failed
                    s4 = parse_result_sennichite
                    if s4 == :failed
                      s4 = parse_result_tsumi
                      s4 = parse_result_fuzumi if s4 == :failed
                    end
                  end
                end
              end
            end
            if s4 != :failed
              if parse_nl != :failed || eos?
                @reported_pos = s0
                s4
              else
                @current_pos = s0
                :failed
              end
            else
              @current_pos = s0
              :failed
            end
          else
            @current_pos = s0
            :failed
          end
        else
          @current_pos = s0
          :failed
        end
      else
        @current_pos = s0
        :failed
      end
    end

    # result_toryo : "勝ち"
    def parse_result_toryo
      s0 = @current_pos
      s1 = match_str("勝ち")
      if s1 != :failed
        @reported_pos = s0
        "TORYO"
      else
        @current_pos = s0
        :failed
      end
    end

    # result_illegal : "反則" ("勝ち" | "負け")
    def parse_result_illegal
      s0 = @current_pos
      if match_str("反則") != :failed
        s10 = @current_pos
        s11 = match_str("勝ち")
        if s11 != :failed
          @reported_pos = s10
          s11 = "ILLEGAL_ACTION"
        end
        s10 = s11
        if s10 == :failed
          s10 = @current_pos
          s11 = match_str("負け")
          if s11 != :failed
            @reported_pos = s10
            s11 = "ILLEGAL_MOVE"
          end
          s10 = s11
        end
        if s10 != :failed
          @reported_pos = s0
          s10
        else
          @current_pos = s0
          :failed
        end
      else
        @current_pos = s0
        :failed
      end
    end

    # result_timeup : "で時間切れにより" turn "手の勝ち"
    def parse_result_timeup
      s0 = @current_pos
      if match_str("で時間切れにより") != :failed
        if parse_turn != :failed
          if match_str("手の勝ち") != :failed
            @reported_pos = s0
            "TIME_UP"
          else
            @current_pos = s0
            :failed
          end
        else
          @current_pos = s0
          :failed
        end
      else
        @current_pos = s0
        :failed
      end
    end

    # result_chudan : "で中断"
    def parse_result_chudan
      s0 = @current_pos
      s1 = match_str("で中断")
      if s1 != :failed
        @reported_pos = s0
        "CHUDAN"
      else
        @current_pos = s0
        :failed
      end
    end

    # result_jishogi : "で持将棋"
    def parse_result_jishogi
      s0 = @current_pos
      s1 = match_str("で持将棋")
      if s1 != :failed
        @reported_pos = s0
        "JISHOGI"
      else
        @current_pos = s0
        :failed
      end
    end

    # result_sennichite : "で千日手"
    def parse_result_sennichite
      s0 = @current_pos
      s1 = match_str("で千日手")
      if s1 != :failed
        @reported_pos = s0
        "SENNICHITE"
      else
        @current_pos = s0
        :failed
      end
    end

    # result_tsumi : "で"? "詰" "み"?
    def parse_result_tsumi
      s0 = @current_pos
      match_str("で")
      if match_str("詰") != :failed
        match_str("み")
        @reported_pos = s0
        "TSUMI"
      else
        @current_pos = s0
        :failed
      end
    end

    # result_fuzumi : "で不詰"
    def parse_result_fuzumi
      s0 = @current_pos
      s1 = match_str("で不詰")
      if s1 != :failed
        @reported_pos = s0
        "FUZUMI"
      else
        @current_pos = s0
        :failed
      end
    end

    # skipline : "#" nonls newline
    def parse_skipline
      s0 = @current_pos
      s1 = match_str("#")
      if s1 != :failed
        s2 = parse_nonls
        s3 = parse_newline
        s0 = if s3 != :failed
               [s1, s2, s3]
             else
               @current_pos = s0
               :failed
             end
      else
        @current_pos = s0
        s0 = :failed
      end
      s0
    end

    # whitespace : " " | "\t"
    def parse_whitespace
      match_regexp(/^[ \t]/)
    end

    # newline : whitespace* ("\n" | "\r" "\n"?)
    def parse_newline
      s0 = @current_pos
      s1 = []
      s2 = parse_whitespace
      while s2 != :failed
        s1 << s2
        s2 = parse_whitespace
      end
      s2 = match_str("\n")
      if s2 == :failed
        s2 = @current_pos
        s3 = match_str("\r")
        s2 = if s3 != :failed
               s4 = match_str("\n")
               s4 = nil if s4 == :failed
               [s3, s4]
             else
               @current_pos = s2
               :failed
             end
      end
      if s2 != :failed
        [s1, s2]
      else
        @current_pos = s0
        :failed
      end
    end

    # nl : newline+ skipline*
    def parse_nl
      s0 = @current_pos
      s2 = parse_newline
      if s2 != :failed
        s1 = []
        while s2 != :failed
          s1 << s2
          s2 = parse_newline
        end
      else
        s1 = :failed
      end
      if s1 != :failed
        s2 = []
        s3 = parse_skipline
        while s3 != :failed
          s2 << s3
          s3 = parse_skipline
        end
        [s1, s2]
      else
        @current_pos = s0
        :failed
      end
    end

    # nonl : 
    def parse_nonl
      match_regexp(/^[^\r\n]/)
    end

    # nonls : nonl*
    def parse_nonls
      stack = []
      matched = parse_nonl
      while matched != :failed
        stack << matched
        matched = parse_nonl
      end
      stack
    end

    # nonls! : nonl+
    def parse_nonls!
      matched = parse_nonls
      if matched.empty?
        :failed
      else
        matched
      end
    end

    # transform header-data to jkf
    def transform_root_header_data(ret)
      if ret["header"]["手番"]
        ret["initial"]["data"]["color"] = "下先".include?(ret["header"]["手番"]) ? 0 : 1
        ret["header"].delete("手番")
      else
        ret["initial"]["data"]["color"] = 0
      end
      ret["initial"]["data"]["hands"] = [
        make_hand(ret["header"]["先手の持駒"] || ret["header"]["下手の持駒"]),
        make_hand(ret["header"]["後手の持駒"] || ret["header"]["上手の持駒"])
      ]
      %w(先手の持駒 下手の持駒 後手の持駒 上手の持駒).each do |key|
        ret["header"].delete(key)
      end
    end

    # transfrom forks to jkf
    def transform_root_forks(forks, moves)
      fork_stack = [{ "te" => 0, "moves" => moves }]
      forks.each do |f|
        now_fork = f
        _fork = fork_stack.pop
        _fork = fork_stack.pop while _fork["te"] > now_fork["te"]
        move = _fork["moves"][now_fork["te"] - _fork["te"]]
        move["forks"] ||= []
        move["forks"] << now_fork["moves"]
        fork_stack << _fork
        fork_stack << now_fork
      end
    end

    # transform initialboard to jkf
    def transform_initialboard(lines)
      board = []
      9.times do |i|
        line = []
        9.times do |j|
          line << lines[j][8 - i]
        end
        board << line
      end
      { "preset" => "OTHER", "data" => { "board" => board } }
    end

    # zenkaku number to number
    def zen2n(s)
      "０１２３４５６７８９".index(s)
    end

    # kanji number to number (1)
    def kan2n(s)
      "〇一二三四五六七八九".index(s)
    end

    # kanji number to number (2)
    def kan2n2(s)
      case s.length
      when 1
        "〇一二三四五六七八九十".index(s)
      when 2
        "〇一二三四五六七八九十".index(s[1]) + 10
      else
        raise "21以上の数値に対応していません"
      end
    end

    # kanji piece-type to csa
    def kind2csa(kind)
      if kind[0] == "成"
        {
          "香" => "NY",
          "桂" => "NK",
          "銀" => "NG"
        }[kind[1]]
      else
        {
          "歩" => "FU",
          "香" => "KY",
          "桂" => "KE",
          "銀" => "GI",
          "金" => "KI",
          "角" => "KA",
          "飛" => "HI",
          "玉" => "OU",
          "王" => "OU",
          "と" => "TO",
          "杏" => "NY",
          "圭" => "NK",
          "全" => "NG",
          "馬" => "UM",
          "竜" => "RY",
          "龍" => "RY"
        }[kind]
      end
    end

    # preset string to jkf
    def preset2str(preset)
      {
        "平手" => "HIRATE",
        "香落ち" => "KY",
        "右香落ち" => "KY_R",
        "角落ち" => "KA",
        "飛車落ち" => "HI",
        "飛香落ち" => "HIKY",
        "二枚落ち" => "2",
        "三枚落ち" => "3",
        "四枚落ち" => "4",
        "五枚落ち" => "5",
        "左五枚落ち" => "5_L",
        "六枚落ち" => "6",
        "八枚落ち" => "8",
        "十枚落ち" => "10",
        "その他" => "OTHER"
      }[preset.gsub(/\s/, "")]
    end
  end
end