class APIHelper

# File lib/ecpay_invoice/helper.rb, line 12
def initialize
    active_merc_info = @@conf_xml.xpath('/Conf/MercProfile').text
    @op_mode = @@conf_xml.xpath('/Conf/OperatingMode').text
    @contractor_stat = @@conf_xml.xpath('/Conf/IsProjectContractor').text
    merc_info = @@conf_xml.xpath("/Conf/MerchantInfo/MInfo[@name=\"#{active_merc_info}\"]")
    @ignore_payment = []
    @@conf_xml.xpath('/Conf/IgnorePayment//Method').each {|t| @ignore_payment.push(t.text)}
    if merc_info != []
        @merc_id = merc_info[0].xpath('./MerchantID').text.freeze
        @hkey = merc_info[0].xpath('./HashKey').text.freeze
        @hiv = merc_info[0].xpath('./HashIV').text.freeze

    else
        raise "Specified merchant setting name (#{active_merc_info}) not found."
    end
end

# File lib/ecpay_invoice/helper.rb, line 77
def encode_special_param!(params, target_arr)
    if params.is_a?(Hash)
        target_arr.each do |n|
            if params.keys.include?(n)
                val = self.urlencode_dot_net(params[n])
                params[n] = val
            end
        end
    end
end

# File lib/ecpay_invoice/helper.rb, line 90
def gen_chk_mac_value(params, mode: 1)
    if params.is_a?(Hash)
        # raise exception if param contains CheckMacValue, HashKey, HashIV
        sec = ['CheckMacValue', 'HashKey', 'HashIV']
        sec.each do |pa|
            if params.keys.include?(pa)
                raise "Parameters shouldn't contain #{pa}"
            end
        end

        raw = params.sort_by{|key,val|key.downcase}.map!{|key,val| "#{key}=#{val}"}.join('&')
        raw = self.urlencode_dot_net(["HashKey=#{@hkey}", raw, "HashIV=#{@hiv}"].join("&"), case_tr: 'DOWN')
        p raw


        case mode
        when 0
        chksum = Digest::MD5.hexdigest(raw)
        when 1
        chksum = Digest::SHA256.hexdigest(raw)
        else
            raise "Unexpected hash mode."
        end
        return chksum.upcase!
    else
        raise "Data recieved is not a Hash."
    end
end

# File lib/ecpay_invoice/helper.rb, line 148
def gen_html_post_form(act:, id:, parameters:, input_typ:'hidden', submit: true)
    f = Nokogiri::HTML::Builder.new do |doc|
        doc.form(method: 'post', action: act, id: id) {
            parameters.map{|key,val|
            doc.input(type: input_typ, name: key, id: key, value: val)
            }
            if submit == true
                doc.script(type: 'text/javascript').text("document.getElementById(\"#{id}\").submit();")
            end
        }
    end
    return f.to_html
end

# File lib/ecpay_invoice/helper.rb, line 41
def get_curr_unixtime()
    return Time.now.to_i
end

# File lib/ecpay_invoice/helper.rb, line 37
def get_ignore_pay()
    return @ignore_payment 
end

# File lib/ecpay_invoice/helper.rb, line 29
def get_mercid()
    return @merc_id
end

# File lib/ecpay_invoice/helper.rb, line 33
def get_op_mode()
    return @op_mode
end

# File lib/ecpay_invoice/helper.rb, line 120
def http_request(method:, url:, payload:)

    target_url = URI.parse(url)

    case method
    when 'GET'
      target_url.query = URI.encode_www_form(payload)
      res = Net::HTTP.get_response(target_url)
    when 'POST'
      res = Net::HTTP.post_form(target_url, payload)
    else
      raise ArgumentError, "Only GET & POST method are avaliable."
    end
    return res.body
    # if res == Net::HTTPOK
    #     return res
    # else
    #     raise "#{res.message}, #{res}"
    # end

    # when Net::HTTPClientError, Net::HTTPInternalServerError
    #   raise Net::HTTPError.new(http_response.message, http_response)
    # else
    #   raise Net::HTTPError.new("Unexpected HTTP response.", http_response)
    # end
end

# File lib/ecpay_invoice/helper.rb, line 45
def is_contractor?()
    if @contractor_stat == 'N'
        return false
    elsif @contractor_stat == 'Y'
        return true
    else
        raise "Unknown [IsProjectContractor] configuration."
    end
end

# File lib/ecpay_invoice/helper.rb, line 55
def urlencode_dot_net(raw_data, case_tr:'DOWN')
    if raw_data.is_a?(String)
        encoded_data = CGI.escape(raw_data)
        case case_tr
        when 'KEEP'
            # Do nothing
        when 'UP'
            encoded_data.upcase!
        when 'DOWN'
            encoded_data.downcase!
        end
        # Process encoding difference between .NET & CGI
        encoded_data.gsub!('%21', '!')
        encoded_data.gsub!('%2a', '*')
        encoded_data.gsub!('%28', '(')
        encoded_data.gsub!('%29', ')')
        return encoded_data
    else
        raise "Data recieved is not a string."
    end
end