module Panda.Model.Comment where

-- env
import Panda.Helper.Env hiding (match, title, body)
import Prelude hiding ((.), (/), (^), id, readFile, writeFile)
import qualified Panda.Config.Global as G
import Panda.Type.Reader
import qualified Panda.Model.Post as Post
import System.Directory
import Panda.Helper.StateHelper

data Comment = Comment
  { uid    :: String     -- comment/08-09-04 blog title
  , author :: String
  , body   :: String
  , author_email :: String
  , author_link    :: String
  }
  deriving (Show, Eq)

instance Resource Comment where
  resource_title = uid >>> spaced_url
  
instance Markable Comment where
  markup x  = render_to_html Markdown (x.body)

instance Datable Comment where
  date x  = x.uid.split "/".last.default_parse_date

-- CRUD
list_for post_id = do
  has_comments <- doesDirectoryExist d
  if has_comments
    then ls d ^ rsort ^ map (G.comment_id / r /) >>= mapM (from_utf8 >>> get)
    else return []
  where
    d = (G.comment_uri / r)
    r = post_id.id_to_resource.to_utf8

get id = do
  xs <- (G.flat_uri / id.to_utf8) .readFile ^ lines
  let author = xs.first
  let author_email = ""
  let author_link = xs.drop 2.first
  let body = xs.drop 4.unlines
  return $ Comment id author body author_email author_link

create h = do
  let author      = at "author"
  let author_link = at "author_link"
  -- let author_email = at "author_email"
  let body        = at "comment"
  let post_id     = at "post_id"

  timestamp <- ( getClockTime >>= toCalendarTime ) ^ format_date G.comment_date_format
  let comment_path = post_id_to_uid post_id .to_utf8
  createDirectoryIfMissing True comment_path
  
  let uid = comment_path / timestamp
  let content = [author, author_link, body].join "\n\n"
  writeFile uid content
  
  where at s = h.lookup s .fromJust

-- extra
from_post_id x = Comment (post_id_to_uid x) "" "" "" ""

post_id_to_uid x = G.flat_uri / G.comment_id / x.split "/" .last
uid_to_post_id x = G.post_id / x.split "/" .last

fill_comment_size x = do
  size <- x.Post.uid.list_for ^ length 
  return $ x { Post.comment_size = size }