module Handler.Upload where

import Import as I
import Data.Time
import qualified Data.Text as T
import qualified System.FilePath as FP
import qualified Filesystem.Path as FSP
import Filesystem.Path.CurrentOS
import Graphics.ImageMagick.MagickWand
import Control.Monad.Trans.Resource
import Foreign
import Foreign.C.Types
import Foreign.C.String
import Helper

data TempMedium = TempMedium
  { tempMediumTitle :: Text
  , tempMediumFile :: FileInfo
  , tempMediumTime :: UTCTime
  , tempMediumOwner :: UserId
  , tempMediumDesc :: Textarea
  , tempMediumTags :: [Text]
  , tempMediumAlbum :: AlbumId
  }

getUploadR :: Handler Html
getUploadR = do
  msu <- lookupSession "userId"
  case msu of
    Just tempUserId -> do
      userId <- lift $ pure $ getUserIdFromText tempUserId
      (uploadWidget, enctype) <- generateFormPost (uploadForm userId)
      defaultLayout $ do
        setTitle "Eidolon :: Upload Medium"
        $(widgetFile "upload")
    Nothing -> do
      setMessage "You need to be logged in"
      redirect $ LoginR

postUploadR :: Handler Html
postUploadR = do
  msu <- lookupSession "userId"
  case msu of
    Just tempUserId -> do
      userId <- lift $ pure $ getUserIdFromText tempUserId
      ((result, uploadWidget), enctype) <- runFormPost (uploadForm userId)
      case result of
        FormSuccess temp -> do
          fil <- return $ tempMediumFile temp
          case (fileContentType fil) `elem` acceptedTypes of
            True -> do
              path <- writeOnDrive fil userId (tempMediumAlbum temp)
              thumbPath <- generateThumb path userId (tempMediumAlbum temp)
              inAlbumId <- return $ tempMediumAlbum temp
              medium <- return $ Medium
                (tempMediumTitle temp)
                ('/' : path)
                ('/' : thumbPath)
                (tempMediumTime temp)
                (tempMediumOwner temp)
                (tempMediumDesc temp)
                (tempMediumTags temp)
                inAlbumId
              mId <- runDB $ I.insert medium
              inAlbum <- runDB $ getJust inAlbumId
              newMediaList <- return $ mId : (albumContent inAlbum)
              runDB $ update inAlbumId [AlbumContent =. newMediaList]
              setMessage "Image succesfully uploaded"
              redirect $ HomeR
            _ -> do
              setMessage "This filetype is not supported"
              redirect $ UploadR
        _ -> do
          setMessage "There was an error uploading the file"
          redirect $ UploadR
    Nothing -> do
      setMessage "You need to be logged in"
      redirect $ LoginR

getDirectUploadR :: AlbumId -> Handler Html
getDirectUploadR albumId = do
  tempAlbum <- runDB $ get albumId
  case tempAlbum of -- does the requested album exist
    Just album -> do
      ownerId <- return $ albumOwner album
      owner <- runDB $ getJust ownerId
      ownerName <- return $ userName owner
      msu <- lookupSession "userId"
      case msu of -- is anybody logged in
        Just tempUserId -> do
          userId <- return $ getUserIdFromText tempUserId
          presence <- return (userId == ownerId)
          case presence of -- is the owner present
            True -> do
              (dUploadWidget, enctype) <- generateFormPost $ dUploadForm userId albumId
              defaultLayout $ do
                setTitle $ toHtml ("Eidolon :: Upload medium to " `T.append` (albumTitle album))
                $(widgetFile "dUpload")
            False -> do
              setMessage "You must own this album to upload"
              redirect $ AlbumR albumId
        Nothing -> do
          setMessage "You must be logged in to upload"
          redirect $ LoginR
    Nothing -> do
      setMessage "This album does not exist"
      redirect $ HomeR

postDirectUploadR :: AlbumId -> Handler Html
postDirectUploadR albumId = do
  tempAlbum <- runDB $ get albumId
  case tempAlbum of -- does the album exist
    Just album -> do
      ownerId <- return $ albumOwner album
      owner <- runDB $ getJust ownerId
      ownerName <- return $ userName owner
      msu <- lookupSession "userId"
      case msu of -- is anybody logged in
        Just tempUserId -> do
          userId <- return $ getUserIdFromText tempUserId
          presence <- return (userId == ownerId)
          case presence of -- is the logged in user the owner
            True -> do
              ((result, dUploadWidget), enctype) <- runFormPost (dUploadForm userId albumId)
              case result of
                FormSuccess temp -> do
                  fil <- return $ tempMediumFile temp
                  case (fileContentType fil) `elem` acceptedTypes of
                    True -> do
                      path <- writeOnDrive fil userId albumId
                      thumbPath <- generateThumb path ownerId albumId
                      medium <- return $ Medium
                        (tempMediumTitle temp)
                        ('/' : path)
                        ('/' : thumbPath)
                        (tempMediumTime temp)
                        (tempMediumOwner temp)
                        (tempMediumDesc temp)
                        (tempMediumTags temp)
                        albumId
                      mId <- runDB $ insert medium
                      inAlbum <- runDB $ getJust albumId
                      newMediaList <- return $ mId : (albumContent inAlbum)
                      runDB $ update albumId [AlbumContent =. newMediaList]
                      setMessage "Image successfully uploaded"
                      redirect $ AlbumR albumId
                    _ -> do
                      setMessage "This filetype is not supported"
                      redirect $ DirectUploadR albumId
                _ -> do
                  setMessage "There was an error uploading the file"
                  redirect $ DirectUploadR albumId
            False -> do -- owner is not present
              setMessage "You must own this album to upload"
              redirect $ AlbumR albumId
        Nothing -> do
          setMessage "You must be logged in to upload"
          redirect $ AlbumR albumId
    Nothing -> do
      setMessage "This Album does not exist"
      redirect $ AlbumR albumId

generateThumb :: FP.FilePath -> UserId -> AlbumId -> Handler FP.FilePath
generateThumb path userId albumId = do
  newName <- return $ (FP.takeBaseName path) ++ "_thumb" ++ (FP.takeExtension path)
  newPath <- return $ "static" FP.</> "data"
    FP.</> (T.unpack $ extractKey userId)
    FP.</> (T.unpack $ extractKey albumId)
    FP.</> newName
  liftIO $ withMagickWandGenesis $ do
    (_ , w) <- magickWand
    readImage w (decodeString path)
    w1 <- getImageWidth w
    h1 <- getImageHeight w
    h2 <- return 220
    w2 <- return $ floor (((fromIntegral w1) / (fromIntegral h1)) * (fromIntegral h2))
    resizeImage w w2 h2 lanczosFilter 1
    setImageCompressionQuality w 95
    writeImage w (Just (decodeString newPath))
  return newPath

writeOnDrive :: FileInfo -> UserId -> AlbumId -> Handler FP.FilePath
writeOnDrive fil userId albumId = do
  filen <- return $ fileName fil
  path <- return $ "static" FP.</> "data"
    FP.</> (T.unpack $ extractKey userId)
    FP.</> (T.unpack $ extractKey albumId)
    FP.</> (T.unpack filen)
  liftIO $ fileMove fil path
  return path

uploadForm :: UserId -> Form TempMedium
uploadForm userId = renderDivs $ TempMedium
  <$> areq textField "Title" Nothing
  <*> areq fileField "Select file" Nothing
  <*> lift (liftIO getCurrentTime)
  <*> pure userId
  <*> areq textareaField "Description" Nothing
  <*> areq tagField "Enter tags" Nothing
  <*> areq (selectField albums) "Album" Nothing
  where
--    albums :: GHandler App App (OptionList AlbumId)
    albums = do
      entities <- runDB $ selectList [AlbumOwner ==. userId] [Desc AlbumTitle]
      optionsPairs $ I.map (\alb -> (albumTitle $ entityVal alb, entityKey alb)) entities

dUploadForm :: UserId -> AlbumId -> Form TempMedium
dUploadForm userId albumId = renderDivs $ TempMedium
  <$> areq textField "Title" Nothing
  <*> areq fileField "Select file" Nothing
  <*> lift (liftIO getCurrentTime)
  <*> pure userId
  <*> areq textareaField "Description" Nothing
  <*> areq tagField "Enter tags" Nothing
  <*> pure albumId