defmodule LineMessage.Message do

  def text(txt), do: text([], txt)
  def text(messages, txt) do
    messages ++ [%{
		    type: "text",
		    text: txt
		}]
  end

  def image(origin_url, preview_url), do: image([], origin_url, preview_url)
  def image(messages, origin_url, preview_url) do
    messages ++ [%{
		    type: "image",
		    originContentUrl: origin_url,
		    previewImageUrl: preview_url
		}]
  end

  def video(origin_url, preview_url), do: video([], origin_url, preview_url)
  def video(messages, origin_url, preview_url) do
    messages ++ [%{
		    type: "video",
		    originContentUrl: origin_url,
		    previewImageUrl: preview_url
		}]
  end

  def audio(origin_url, duration), do: image([], origin_url, duration)
  def audio(messages, origin_url, duration) do
    messages ++ [%{
		    type: "audio",
		    originContentUrl: origin_url,
		    duration: duration
		}]
  end

  def location(title, address, latitude, longitude) do
    location([], title, address, latitude, longitude)
  end
  def location(messages, title, address, latitude, longitude) do
    messages ++ [%{
		    type: "location",
		    title: title,
		    address: address,
		    latitude: latitude,
		    longitude: longitude
		}]
  end

  def sticker(package_id, sticker_id), do: sticker([], package_id, sticker_id)
  def sticker(messages, package_id, sticker_id) do
    messages ++ [%{
		   type: "sticker",
		   packageId: package_id,
		   stickerId: sticker_id
	       }]
  end

  def imagemap(alt_text, base_content = %{url: _, height: _, width: _}, actions) do
    imagemap([], alt_text, base_content, actions)
  end
  def imagemap(messages, alt_text, %{url: url, height: base_height, width: base_width}, actions)
  when is_list(actions) do
    messages ++ [%{
		    type: "imagemap",
		    baseUrl: url,
		    altText: alt_text,
		    baseSize: %{
		      height: base_height,
		      width: base_width
		    },
		    actions: actions
		 }]
  end

  defmodule Template do

    def button(alt_text, content = %{image: _, title: _, text: _, actions: _}) do
      button([], alt_text, content)
    end
    def button(messages, alt_text, %{image: image, title: title, text: text, actions: actions}) do
      template(messages, alt_text, %{
	    type: "buttons",
	    thumbnailImageUrl: image,
	    title: title,
	    text: text,
	    actions: actions
	       })
    end

    def confirm(alt_text, content = %{text: _, actions: _}) do
      confirm([], alt_text, content)
    end
    def confirm(messages, alt_text, %{text: text, actions: actions}) do
      template(messages, alt_text, %{
	    type: "confirm",
	    text: text,
	    actions: actions
	       })
    end

    defp template(messages, alt_text, temp) do
      messages ++ [%{
		     type: "template",
		     altText: alt_text,
		     template: temp
		  }]      
    end
  end
  
end