# Title: Simple Mahjong tag for Jekyll
# Author: smwlover
# Syntax: {% mahjong cardName %}
#
# Examples:
# {% mahjong 1m %} 表示一万
# {% mahjong 5!s %} 表示红五索（日麻中的红宝牌）
# {% mahjong 3$p %} 表示横置的三饼（日麻中吃、碰、杠的横置）
# 字牌用数字1-7加j表示。其中1-4分别对应东、南、西、北，5-7则对应白、发、中。
# 暗牌用数字0加m、s、p或j中的任何一个都可以表示。

module Jekyll
  class MahjongTag < Liquid::Tag
    def initialize(tag_name, markup, tokens)
        @curFlag = -1 #m, s, p或j对应0, 1, 2, 3
        @cardNumber = -1 #牌的编号
        @isAkaDora = false #是否是红宝牌
        @isRotated = false #是否是横置的牌
        @successful = true #解析是否成功
        @path = "" #存储解析的结果

        str = "#{markup}".strip
        strLen = str.size
        strReversed = str.reverse
        count = 0
        while count < strLen do
            curChar = strReversed[count]
            if count == 0
                if curChar == "m"
                    @curFlag = 0
                elsif curChar == "s"
                    @curFlag = 1
                elsif curChar == "p"
                    @curFlag = 2
                elsif curChar == "j"
                    @curFlag = 3
                else
                    @path = "缺少m、p、s、j标签"
                    @successful = false
                    break
                end
            else
                if @cardNumber >= 0 #如果重复声明了牌的编号
                    @path = "重复声明了牌的编号"
                    @successful = false
                    break
                end
                if curChar == "$"
                    @isRotated = true
                elsif curChar == "!"
                    @isAkaDora = true
                else
                    @cardNumber = curChar.getbyte(0) - 48
                    if @curFlag == 3 && (@cardNumber < 0 || @cardNumber > 7)
                        @path = "j标签对应的编号只能为0到7"
                        @successful = false
                        break
                    elsif @cardNumber < 0 || @cardNumber > 9
                        @path = "m、p、s标签对应的编号只能为0到9"
                        @successful = false
                        break
                    elsif @isAkaDora && (@cardNumber != 5 || @curFlag == 3) #红宝牌必须是五索、五万、五饼。
                        @path = "红宝牌必须是五万、五饼、五索"
                        @successful = false
                        break
                    elsif @isRotated && @cardNumber == 0 #暗牌不能横置
                        @path = "暗牌不能横置"
                        @successful = false
                        break
                    end
                end
            end
            count = count + 1
        end
        if @cardNumber == -1 || @curFlag == -1
            @successful = false
        end
        if @successful
            getPath()
        end
        super
    end

    def render(context)
        if @successful
            "<img class=\"mahjong\" src=\"#{@path}\"/>"
        else
            "<strong>错误：#{@path}</strong>"
        end
    end

    def getPath()
        direction = "tate"
        name = ""
        if @isRotated
            direction = "yoko"
        end
        if @isAkaDora
            if @curFlag == 0
                name = "aka5m"
            elsif @curFlag == 1
                name = "aka5s"
            elsif @curFlag == 2
                name = "aka5p"
            end
        elsif @cardNumber == 0
            name = "back"
        else
            name = "#{@cardNumber + 9 * @curFlag}"
        end
        @path = "/images/mahjong/#{direction}/#{name}.png"
    end
  end
end

Liquid::Template.register_tag('mahjong', Jekyll::MahjongTag)

.mahjong{
    border: 0px;
    border-radius: 0px;
    box-shadow: none;
    vertical-align: middle;
}