#####################################################
# 微信公众号帐号管理 （带参二维码获得）
# Created by zhangmingxin
# Date: 2018-05-18
# Wechat number: zmx119966
####################################################

class WxApi
  module Account
    ###
    # 获取临时场景带惨二维码，30天有效
    # @param <int> sceneid -- 场景值ID，临时二维码时为32位非0整型，永久二维码时最大值为100000（目前参数只支持1--100000）
    # @return <string> url -- 二维码网址
    #
    def get_qrscene(sceneid)
      access_token = get_access_token()

      # 获取ticket
      uri = URI.parse("#{prefix}/cgi-bin/qrcode/create?access_token=#{access_token}")
      post_data = {
          'expire_seconds' => 2592000,
          'action_name' => 'QR_SCENE',
          'action_info' => {'scene' => {'scene_id' => sceneid}}}
      http = Net::HTTP.new(uri.host, uri.port)
      http.use_ssl = true
      http.verify_mode = OpenSSL::SSL::VERIFY_NONE
      request = Net::HTTP::Post.new("/cgi-bin/qrcode/create?access_token=#{access_token}")
      request.add_field('Content-Type', 'application/json')
      request.body = post_data.to_json
      response = http.request(request)
      content = JSON.parse(response.body)
      ticket = content['ticket']

      # 通过ticket换取二维码
      "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=#{ticket}"
    end

    ###
    # 获取永久二维码
    # @param <int> sceneid -- 场景值ID，临时二维码时为32位非0整型，永久二维码时最大值为100000（目前参数只支持1--100000）
    # @return <string> url -- 二维码网址
    #
    def get_qrsrtscene(sceneid)
      access_token = get_access_token()

      # 获取ticket
      uri = URI.parse("#{prefix}/cgi-bin/qrcode/create?access_token=#{access_token}")
      post_data = {
          'action_name' => 'QR_LIMIT_STR_SCENE',
          'action_info' => {'scene' => {'scene_id' => sceneid}}}
      http = Net::HTTP.new(uri.host, uri.port)
      http.use_ssl = true
      http.verify_mode = OpenSSL::SSL::VERIFY_NONE
      request = Net::HTTP::Post.new("/cgi-bin/qrcode/create?access_token=#{access_token}")
      request.add_field('Content-Type', 'application/json')
      request.body = post_data.to_json
      response = http.request(request)
      content = JSON.parse(response.body)
      ticket = content['ticket']

      # 通过ticket换取二维码
      "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=#{ticket}"
    end

    ###
    # 保存带参数二维码到指定位置
    # @param <string> path -- 例如： "#{Rails.root}/public/qrcode"
    # @param <string> filename -- 文件名，可选参数，默认不填写则使用时间戳+随机数的方式命名
    #
    # @return <string> path -- 二维码的保存路径
    def save_qrcode(path, *filename)
      # 判断是否需要新建文件
      unless File.exist?(path)
        FileUtils.makedirs(path)
      end

      if filename
        path = "#{path}/#{filename}"
      else
        path = "#{path}/#{Time.now.to_i.to_s}_#{rand 1000.9999}"
      end

      File.open(path, 'wb') do |f|
        f.write(HTTParty.get(url).body)
      end

      path
    end

    ###
    # @param <string> longurl -- 需要被压缩的url
    #
    # @return <json> shorturl -- 返回短链接 {"errcode":0,"errmsg":"ok","short_url":"http:\/\/w.url.cn\/s\/AvCo6Ih"}
    # if false
    # @return {"errcode":40013,"errmsg":"invalid appid"}
    #
    def get_shorturl(longurl)
      access_token = get_access_token()
      uri = URI.parse("#{prefix}/cgi-bin/shorturl?access_token=#{access_token}")
      post_data = {action: "long2short", long_url: longurl}
      http = Net::HTTP.new(uri.host, uri.port)
      http.use_ssl = true
      http.verify_mode = OpenSSL::SSL::VERIFY_NONE
      request = Net::HTTP::Post.new("/cgi-bin/shorturl?access_token=#{access_token}")
      request.add_field('Content-Type', 'application/json')
      request.body = post_data.to_json
      response = http.request(request)

      JSON.parse(response.body)
    end
  end
end