diff --git a/ChangeLog.md b/ChangeLog.md
new file mode 100644
--- /dev/null
+++ b/ChangeLog.md
@@ -0,0 +1,5 @@
+# Revision history for fluffy
+
+## 0.1.0.0  -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+              GNU GENERAL PUBLIC LICENSE
+                Version 3, 29 June 2007
+
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+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+              END OF TERMS AND CONDITIONS
+
+     How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/data/prelude.js b/data/prelude.js
new file mode 100644
--- /dev/null
+++ b/data/prelude.js
@@ -0,0 +1,1 @@
+console.log("fluffy-engine prelude.js loaded\n");
diff --git a/fluffy.cabal b/fluffy.cabal
new file mode 100644
--- /dev/null
+++ b/fluffy.cabal
@@ -0,0 +1,50 @@
+-- Initial fluffy.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                fluffy
+version:             0.1.0.71
+synopsis:            A simple web application as a online practice website for XDU SE 2017 fall SPM.
+description:         A simple web application as a online practice website for XDU SE 2017 fall SPM.
+license:             GPL-3
+license-file:        LICENSE
+author:              Johann Lee
+maintainer:          qinka@live.com
+copyright:           Copyright (C) 2017 Johann Lee <me@qinka.pro>
+category:            Web
+build-type:          Simple
+extra-source-files:  ChangeLog.md
+cabal-version:       >=1.10
+
+data-dir:            data
+data-files:          prelude.js
+
+executable fluffy
+  main-is:             Main.hs
+  other-modules:       Paths_fluffy
+  other-extensions:    ViewPatterns
+                     , MultiWayIf
+                     , OverloadedStrings
+                     , QuasiQuotes
+                     , TemplateHaskell
+                     , TypeFamilies
+                     , RecordWildCards
+  build-depends:       base >= 4  && < 5
+                     , yesod-core
+                     , yesod-static
+                     , text
+                     , bytestring >= 0.10
+                     , MonadRandom
+                     , aeson >= 1.2
+                     , resource-pool >= 0.2
+                     , time >= 1.8
+                     , cmdargs >= 0.10
+                     , postgresql-simple >= 0.5
+                     , uuid-types >= 1.0
+  hs-source-dirs:      src
+  default-language:    Haskell2010
+
+source-repository head
+  type: git
+  location: https://github.com/Qinka/fluffy-engine.git
+  branch: master
+  subdir: fluffy 
diff --git a/src/Main.hs b/src/Main.hs
new file mode 100644
--- /dev/null
+++ b/src/Main.hs
@@ -0,0 +1,455 @@
+{-# LANGUAGE ViewPatterns      #-}
+{-# LANGUAGE MultiWayIf        #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes       #-}
+{-# LANGUAGE TemplateHaskell   #-}
+{-# LANGUAGE TypeFamilies      #-}
+{-# LANGUAGE RecordWildCards   #-}
+
+
+module Main where
+
+import           Control.Monad
+import           Control.Monad.Random
+import           Data.Aeson
+import qualified Data.ByteString       as B hiding (pack, unpack)
+import qualified Data.ByteString.Char8 as B (pack, unpack)
+import           Data.Char
+import           Data.Maybe
+import           Data.Pool
+import qualified Data.Text             as T
+import qualified Data.Text.Encoding    as TE
+import           Data.Time
+import           Database.PostgreSQL.Simple
+import           Database.PostgreSQL.Simple.FromRow
+import           Database.PostgreSQL.Simple.SqlQQ
+import           Database.PostgreSQL.Simple.Types
+import           System.Environment
+import           Yesod.Core
+import           Yesod.Core.Json
+import           Yesod.Core.Content
+import           Paths_fluffy
+import           Yesod.Static
+
+
+-- Site
+data Fluffy = Fluffy
+              { fluffyConnectionPool :: Pool Connection
+              , fluffyStatic         :: Static
+              }
+
+-- True or False
+data TrueOrFalse = TrueOrFalse
+                   { tofId :: Int
+                   , tofBody :: T.Text
+                   , tofAnswer :: Bool
+                   , tofRationale :: Maybe T.Text
+                   , tofDifficulty :: Maybe T.Text
+                   , tofReference :: Maybe Int
+                   , tofLearningObjectives :: Maybe T.Text
+                   , tofNationalStandards :: Maybe T.Text
+                   , tofTopics :: Maybe T.Text
+                   , tofKeyWords :: [T.Text]
+                   }
+                   deriving (Show,Eq)
+
+-- Gap filling
+data GapFilling = GapFilling
+                  { gfId :: Int
+                  , gfBody :: T.Text
+                  , gfAnswer :: T.Text
+                  , gfDifficulty :: Maybe T.Text
+                  , gfReference :: Maybe Int
+                  , gfLearningObjectives :: Maybe T.Text
+                  , gfNationalStandards :: Maybe T.Text
+                  , gfTopics :: Maybe T.Text
+                  , gfKeyWords :: [T.Text]
+                  }
+                  deriving (Show,Eq)
+
+-- Multiple Choice
+data MultipleChoice = MultipleChoice
+                    { mcId :: Int
+                    , mcBody :: T.Text
+                    , mcAnswer :: Int
+                    , mcChoices :: [T.Text]
+                    }
+                    deriving (Show,Eq)
+
+instance FromRow TrueOrFalse where
+  fromRow = TrueOrFalse
+    <$> field
+    <*> field
+    <*> field
+    <*> field
+    <*> field
+    <*> field
+    <*> field
+    <*> field
+    <*> field
+    <*> (fromPGArray <$> field)
+
+instance FromRow GapFilling where
+  fromRow = GapFilling
+    <$> field
+    <*> field
+    <*> field
+    <*> field
+    <*> field
+    <*> field
+    <*> field
+    <*> field
+    <*> (fromPGArray <$> field)
+
+instance FromRow MultipleChoice where
+  fromRow = MultipleChoice
+    <$> field
+    <*> field
+    <*> field
+    <*> (fromPGArray <$> field)
+
+
+mkYesod "Fluffy" [parseRoutes|
+/                            HomeR              GET
+/true-or-false/#Int          TrueOrFalseR       GET
+/gap-filling/#Int            GapFillingR        GET
+/multiple-choice/#Int        MultipleChoiceR    GET
+/static                      StaticR            Static fluffyStatic
+/.clean-history              CleanHistory       GET
+|]
+
+instance Yesod Fluffy where
+  makeSessionBackend site = pure <$> defaultClientSessionBackend (7 * 24 * 60)  "client_session_key.aes"
+  defaultLayout widget = do
+    pc <- widgetToPageContent widget
+    withUrlRenderer
+      [hamlet|
+              $doctype 5
+              <html>
+                <head>
+                  <title> #{pageTitle pc}
+                  <meta charset=utf-8>
+                  <meta name=viewport content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no">
+                  <script src=/static/prelude.js>
+                  ^{pageHead pc}
+                <body>
+                  <div id=fluffybody>
+                    ^{pageBody pc}
+              |]
+
+-- home page
+getHomeR :: Handler Html
+getHomeR = do
+  goal  <- fromMaybe 0 . fmap (read . T.unpack) <$> lookupSession "goal"
+  total <- fromMaybe 0 . fmap (read . T.unpack) <$> lookupSession "total"
+  defaultLayout $ do
+    setTitle "Fluffy Engine"
+    pageAbove Nothing Nothing goal total
+    [whamlet|
+            <div class=fehead>
+              <h1> Fluffy Engine
+              <p> Hi
+            <div class=tofl>
+              <a href=@{TrueOrFalseR 1}> Go to True or False
+            <div class=gfl>
+              <a href=@{GapFillingR 1}> Go to Gap Filling
+            <div class=mcl>
+              <a href=@{MultipleChoiceR 1}> Go to Multiple Choice
+           |]
+
+data TOFRes = TOFProb
+            | TOFForm Bool
+            deriving (Show,Eq)
+
+getTrueOrFalseR :: Int -> Handler Html
+getTrueOrFalseR i = do
+  answer <- lookupGetParam "answer"
+  cp  <- fluffyConnectionPool <$> getYesod
+  qrt <- liftIO $ withResource cp $ \c -> do
+    query c [sql|
+                SELECT key_id, key_body, key_answer, key_rationale, key_difficulty,
+                       key_references, key_learning_objectives, key_national_standards,
+                       key_topics, key_words
+                FROM table_true_or_false
+                WHERE key_id = ?
+                |]
+      (Only i)
+  when (null qrt) notFound
+  let TrueOrFalse{..} = head qrt
+  goal'  <- fromMaybe 0 . fmap (read . T.unpack) <$> lookupSession "goal"
+  total' <- fromMaybe 0 . fmap (read . T.unpack) <$> lookupSession "total"
+  (goal, total, con) <- 
+    case answer of
+      Just x -> do
+        let rt = (x == "t") == tofAnswer
+            goal  = goal'  + (if rt then 1 else 0)
+            total = total' + 1
+        return (goal, total, TOFForm rt)
+      Nothing -> return (goal', total', TOFProb)
+  let last = if i > 0 then TrueOrFalseR (i-1) else HomeR
+      next = TrueOrFalseR (i+1)
+  setSession "goal" $ T.pack $ show $ goal
+  setSession "total" $ T.pack $ show $ total
+  defaultLayout $ do
+    setTitle $ toHtml $ T.pack $ "True or False: " ++ show i
+    pageAbove (Just last) (Just next) goal total
+    [whamlet|
+            <div class=tofhead>
+              <h3> True or False
+            <div class=tofpb>
+              <h2> Problem
+              <p> #{tofBody}
+            |]
+    case con of
+      TOFProb ->
+        [whamlet|
+                <div class=tofform>
+                  <form>
+                    <div class=toftrue>
+                      <input type=radio name=answer value=t checked> True
+                    <div class=toffalse>
+                      <input type=radio name=answer value=f>         False
+                    <div class=tofcheck>
+                      <input type=submit value=Check>
+                |]
+      TOFForm rt ->
+        [whamlet|
+                <div class=tofans>
+                  <h3> Answer #{show rt}
+                  <p> #{show tofAnswer}
+                $maybe ra <- tofRationale
+                  <div class=tofrationale>
+                    <h3> Rationale
+                    <p> #{ra}
+                $maybe d <- tofDifficulty
+                  <div class=tofdifficulty>
+                    <h3> Difficluty
+                    <p> #{d}
+                $maybe r <- tofReference
+                  <div class=tofref>
+                    <h3> Reference
+                    <p> p.#{show r}
+                $maybe l <- tofLearningObjectives
+                  <div class=toflo>
+                    <h3> Learning Objectives
+                    <p> #{l}
+                $maybe n <- tofNationalStandards
+                  <div class=tofns>
+                    <h3> National Standards
+                    <p> #{n}
+                $if not (null tofKeyWords)
+                  <div class=tofkw>
+                    <h3> Key Words
+                    <ul>
+                    $forall kw <- tofKeyWords
+                      <li> #{kw}
+                $if not (null tofTopics)
+                  <div class=toftopic>
+                    <h3> Topics
+                    <ul>
+                    $forall t <- tofTopics
+                      <li> #{t}
+               |]
+
+
+data GFRes = GFProb
+           | GFForm Bool
+           deriving (Show,Eq)
+
+getGapFillingR :: Int -> Handler Html
+getGapFillingR i = do
+  answer <- lookupGetParam "answer"
+  cp  <- fluffyConnectionPool <$> getYesod
+  qrt <- liftIO $ withResource cp $ \c -> do
+    query c [sql|
+                SELECT key_id, key_body, key_answer, key_difficulty,
+                       key_references, key_learning_objectives, key_national_standards,
+                       key_topics, key_words
+                FROM table_gap_filling
+                WHERE key_id = ?
+                |]
+      (Only i)
+  when (null qrt) notFound
+  let GapFilling{..} = head qrt
+  goal'  <- fromMaybe 0 . fmap (read . T.unpack) <$> lookupSession "goal"
+  total' <- fromMaybe 0 . fmap (read . T.unpack) <$> lookupSession "total"
+  (goal, total, con) <- 
+    case answer of
+      Just x' -> do
+        let x = T.reverse . T.dropWhile (==' ') . T.reverse $ T.dropWhile (== ' ') x'
+            rt = x `elem` T.lines gfAnswer
+            goal  = goal'  + (if rt then 1 else 0)
+            total = total' + 1
+        return (goal, total,GFForm rt)
+      Nothing -> return (goal', total', GFProb)
+  let last = if i > 0 then GapFillingR (i-1) else HomeR
+      next = GapFillingR (i+1)
+  setSession "goal" $ T.pack $ show $ goal
+  setSession "total" $ T.pack $ show $ total
+  defaultLayout $ do
+    setTitle $ toHtml $ T.pack $ "Gap Filling: " ++ show i
+    pageAbove (Just last) (Just next) goal total
+    [whamlet|
+            <div class=gfhead>
+              <h3> Gap Filling
+            <div class=gfpb>
+              <h2> Problem
+              <p> #{gfBody}
+            |]
+    case con of
+      GFProb ->
+        [whamlet|
+                <div class=gfform>
+                  <form>
+                    <div class=gfinput>
+                      <input type=text name=answer  autocomplete=off>
+                    <div class=gfcheck>
+                      <input type=submit value=Check>
+                |]
+      GFForm rt ->
+        [whamlet|
+                <div class=gfans>
+                  <h3> Answer #{show rt}
+                  <p> #{show gfAnswer}
+                $maybe d <- gfDifficulty
+                  <div class=gfdiff>
+                    <h3> Difficluty
+                    <p> #{d}
+                $maybe r <- gfReference
+                  <div class=gfref>
+                    <h3> Reference
+                    <p> p.#{show r}
+                $maybe l <- gfLearningObjectives
+                  <div class=gflo>
+                    <h3> Learning Objectives
+                    <p> #{l}
+                $maybe n <- gfNationalStandards
+                  <div class=gfns>
+                    <h3> National Standards
+                    <p> #{n}
+                $if not (null gfKeyWords)
+                  <div class=gfkw>
+                    <h3> Key Words
+                    <ul>
+                    $forall kw <- gfKeyWords
+                      <li> #{kw}
+                $if not (null gfTopics)
+                  <div class=gftopic>
+                    <h3> Topics
+                    <ul>
+                    $forall t <- gfTopics
+                      <li> #{t}
+                |]
+
+data MCRes = MCProb
+           | MCForm Bool
+           deriving (Show,Eq)
+
+getMultipleChoiceR :: Int -> Handler Html
+getMultipleChoiceR i =  do
+  answer <- lookupGetParam "answer"
+  cp  <- fluffyConnectionPool <$> getYesod
+  qrt <- liftIO $ withResource cp $ \c -> do
+    query c [sql|
+                SELECT key_id, key_body, key_answer, key_choices
+                FROM table_multiple_choice
+                WHERE key_id = ?
+                |]
+      (Only i)
+  when (null qrt) notFound
+  let MultipleChoice{..} = head qrt
+      toId  = T.pack . show
+      toAns = T.pack . pure . chr . (+ ord 'A')
+      mixAns = zip [0..]
+  goal'  <- fromMaybe 0 . fmap (read . T.unpack) <$> lookupSession "goal"
+  total' <- fromMaybe 0 . fmap (read . T.unpack) <$> lookupSession "total"
+  (goal, total, con) <- 
+    case answer of
+      Just x' -> do
+        let x = read $ T.unpack x'
+            rt = x == mcAnswer
+            goal  = goal'  + (if rt then 1 else 0)
+            total = total' + 1
+        return (goal, total, MCForm rt)
+      Nothing -> return (goal', total', MCProb)
+  setSession "goal" $ T.pack $ show $ goal
+  setSession "total" $ T.pack $ show $ total
+  let last = if i > 0 then MultipleChoiceR (i-1) else HomeR
+      next = MultipleChoiceR (i+1)
+  defaultLayout $ do
+    setTitle $ toHtml $ T.pack $ "Multiple Choice: " ++ show i
+    pageAbove (Just last) (Just next) goal total
+    [whamlet|
+            <div class=mchead>
+              <h3> Multiple Choice
+            <div class=mcpb>
+              <h2> Problem
+              <p> #{mcBody}
+            |]
+    case con of
+      MCProb ->
+        [whamlet|
+                <div class=mcform>
+                  <form>
+                    <div class=mccs>
+                      $forall (l,c) <- mixAns mcChoices
+                        <p> <input type=radio name=answer value=#{toId l}> #{toAns l}: #{c}
+                    <div class=mcchecked>
+                      <input type=submit value=Check>
+                |]
+      MCForm rt -> 
+        [whamlet|
+                <div class=mcans>
+                  <h3> Answer #{show rt}
+                  <p> #{toAns mcAnswer}
+                <div class=mcchoices>
+                  <h3> Choices
+                  <ul>
+                    $forall (l,c) <- mixAns mcChoices
+                      <li> #{toAns l}: #{c}
+                |]
+
+
+getCleanHistory :: Handler Html
+getCleanHistory = do
+  deleteSession "goal"
+  deleteSession "total"
+  redirect HomeR
+
+main :: IO ()
+main = do
+  port':dbHost' <- getArgs
+  let dbHost = unwords dbHost'
+      port   = read port'
+  pgPool <-
+    createPool
+    (connectPostgreSQL $ B.pack dbHost)
+    close
+    100
+    1000
+    200
+  s <- getDataDir >>= static
+  warp port $ Fluffy pgPool s
+
+
+pageAbove :: (a ~ Route Fluffy, b ~ Route Fluffy)
+          => Maybe a -- ^ last page
+          -> Maybe b -- ^ next page
+          -> Int     -- ^ goal
+          -> Int     -- ^ total
+          -> WidgetT Fluffy IO ()
+pageAbove l n g t=
+  [whamlet|
+          <div class=navbutton>
+            $maybe ll <- l
+              <div class=lastbutton>
+                <a href=@{ll}> Last
+            $maybe nn <- n
+              <div class=nextbutton>
+                <a href=@{nn}> Next
+            <div class=cleanbutton>
+              <a href=@{CleanHistory}> Clean History
+          <div class=gthead>
+            <h3> Goal / Total
+            <p> #{show g} / #{show t}
+          |]
