require 'microformats'
require 'redcarpet/render_strip'
require 'webmention'

class BlogsController < ApplicationController
  skip_before_action :verify_authenticity_token, only: [:webmention]

  def summary
    @blogs = Blog.where(published: true).order(published_at: :desc).paginate(page: params[:page], per_page: 10)
    if not params[:page]
      @main_page = true
    end
  end

  def index
    @blogs = Blog.where(published: true).order(published_at: :desc)

    respond_to do |format|
      format.html
      format.atom
    end
  end

  def show
    @blog = Blog.find_by_slug(params[:slug])

    raise ActiveRecord::RecordNotFound unless @blog
    raise ActiveRecord::RecordNotFound unless @blog.published

    @prev = @blog.prev
    @next = @blog.next

    body = Redcarpet::Markdown.new(Redcarpet::Render::StripDown).render(@blog.body)

    set_meta_tags(og: {
      title: @blog.title,
      type: "article",
      description: (body.length <= 300 ? body : body[0..299]),
      url: blog_url(@blog, host: "www.fourisland.com"),
      article: {
        published_time: @blog.published_at.iso8601,
        modified_time: @blog.updated_at.iso8601
      }
    })
  end

  def upvote
    @blog = Blog.find_by_slug(params[:slug])

    raise ActiveRecord::RecordNotFound unless @blog
    raise ActiveRecord::RecordNotFound unless @blog.published

    respond_to do |format|
      if @blog.upvote! request.remote_ip
        format.html do
          flash[:notice] = "You have upvoted the blog post \"#{@blog.title}\"."
          redirect_to @blog
        end
        format.js { render "voted" }
        format.xml { head :ok }
      else
        format.html do
          flash[:notice] = "You have already voted on the blog post \"#{@blog.title}\"."
          redirect_to @blog
        end
        format.xml { render :xml => { :error => "Someone from your IP address has already voted on this blog post."} }
      end
    end
  end

  def downvote
    @blog = Blog.find_by_slug(params[:slug])

    raise ActiveRecord::RecordNotFound unless @blog
    raise ActiveRecord::RecordNotFound unless @blog.published

    respond_to do |format|
      if @blog.downvote! request.remote_ip
        format.html do
          flash[:notice] = "You have downvoted the blog post \"#{@blog.title}\"."
          redirect_to @blog
        end
        format.js { render "voted" }
        format.xml { head :ok }
      else
        format.html do
          flash[:notice] = "You have already voted on the blog post \"#{@blog.title}\"."
          redirect_to @blog
        end
        format.xml { render :xml => { :error => "Someone from your IP address has already voted on this blog post."} }
      end
    end
  end

  def webmention
    @blog = Blog.find_by_slug(params[:slug])

    raise ActiveRecord::RecordNotFound unless @blog
    raise ActiveRecord::RecordNotFound unless @blog.published

    permalink = url_for(@blog)

    target = params[:target]
    unless target == permalink
      render json: { error: "Incorrect target for webmention endpoint (#{target} != #{permalink})." }
      return
    end

    source = params[:source]
    verification = Webmention.verify_webmention(source, target)
    unless verification.verified?
      render json: { error: "Webmention could not be verified." }
      return
    end

    response = Webmention::Request.get(source)
    parsed = Microformats.parse(response.body.to_s)

    if parsed.entry.properties.to_hash.include?("like-of") and parsed.entry.like_of(:all).map(&:to_s).include? permalink
      @blog.like!(parsed.entry.author.url, parsed.entry.author.name)
    end

    head :ok
  end

end