require "../handler"
require "../views/html/page"

class Guff::Handlers::BlogHandler < Guff::Handler
  ROUTES = [{
    list: false,
    blog: true,
    re: %r{
      ^/

      # match YYYY/MM/DD/SLUG.html
      (?<year>\d{4})
      /
      (?<month>\d{2})
      /
      (?<day>\d{2})
      /
      (?<slug>[a-z0-9._-]+)
      \.html

      $
    }x,
  }, {
    list: true,
    blog: true,
    re: %r{
      ^/

      # match YYYY/MM/DD
      (?<year>\d{4})
      /
      (?<month>\d{2})
      /
      (?<day>\d{2})
      /?

      $
    }x,
  }, {
    list: true,
    blog: true,
    re: %r{
      ^/

      # match YYYY/MM
      (?<year>\d{4})
      /
      (?<month>\d{2})
      /?

      $
    }x,
  }, {
    list: true,
    blog: true,
    re: %r{
      ^/

      # match YYYY
      (?<year>\d{4})
      /?

      $
    }x,
  }, {
    list: false,
    blog: false,
    re: %r{
      ^/

      # match slug
      (?<slug>[a-z0-9._-]+)
      \.html

      $
    }x,
  }, {
    list: true,
    blog: true,
    re: %r{
      # match index
      ^/$
    }x,
  }]

  def call(context : HTTP::Server::Context)
    path = context.request.path || ""

    call_next(context) unless ROUTES.reduce(false) do |matched, route|
      unless matched
        if md = (route[:re] as Regex).match(path)
          # log blog route match
          puts "blog: route = %s, md = %s" % [
            route.to_s,
            md.to_s
          ]

          # search for matching posts
          posts = @models.post.get_posts(
            filters:  get_filters(md),
            tags:     [["foo"]],
          )

          if posts.size > 0
            # mark as matched
            matched = true

            # draw result
            draw(context, route, posts)
          end
        end
      end

      matched
    end
  end

  FILTERS = {
    year:   "year",
    month:  "month",
    day:    "day",
    slug:   "slug",
  }

  private def get_filters(md) : Hash(Symbol, String)
    FILTERS.reduce({} of Symbol => String) do |r, k, s|
      r[k] = md[s] if md[s]?
      r
    end
  end

  private def draw(context, route, posts)
    # create page
    page = PageHTMLView.new("Posts", posts.rows.map { |post| post.to_s }.join)

    # render page
    context.response.content_type =  page.content_type
    context.response.puts page
  end
end