From b3dd410bb4ed093b74fe349d3a51a5767c76f952 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Sun, 19 May 2019 22:19:15 +0200
Subject: Direct message service basics

---
 src/Main.hs | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 92 insertions(+), 12 deletions(-)

(limited to 'src/Main.hs')

diff --git a/src/Main.hs b/src/Main.hs
index 2a4dc4e..35f5a23 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -1,9 +1,12 @@
 module Main (main) where
 
-import Control.Concurrent.Chan
+import Control.Concurrent
 import Control.Exception
 import Control.Monad
 
+import Data.List
+import Data.Maybe
+import qualified Data.Text as T
 import qualified Data.Text.IO as T
 
 import System.Environment
@@ -11,16 +14,30 @@ import System.IO
 import System.IO.Error
 
 import Identity
+import Message
 import Network
 import PubKey
 import Storage
 
 
-main :: IO ()
-main = do
-    [bhost] <- getArgs
-    st <- openStorage "test"
-    idhead <- catchJust (guard . isDoesNotExistError) (loadHead st "identity") $ \_ -> do
+data Erebos = Erebos
+    { erbIdentity :: Stored Identity
+    , erbMessages :: StoredList DirectMessageThread
+    }
+
+instance Storable Erebos where
+    store' erb = storeRec $ do
+        storeRef "id" $ erbIdentity erb
+        storeZRef "dmsgs" $ erbMessages erb
+
+    load' = loadRec $ Erebos
+        <$> loadRef "id"
+        <*> loadZRef "dmsgs"
+
+
+loadErebosHead :: Storage -> IO Head
+loadErebosHead st = do
+    catchJust (guard . isDoesNotExistError) (loadHead st "erebos") $ \_ -> do
         putStr "Name: "
         hFlush stdout
         name <- T.getLine
@@ -31,14 +48,77 @@ main = do
         (_devSecretMsg, devPublicMsg) <- generateKeys st
 
         owner <- wrappedStore st =<< sign secret =<< wrappedStore st (emptyIdentity public publicMsg) { idName = Just name }
-        base <- signAdd devSecret =<< sign secret =<<
+        identity <- wrappedStore st =<< signAdd devSecret =<< sign secret =<<
             wrappedStore st (emptyIdentity devPublic devPublicMsg) { idOwner = Just owner }
 
-        Right h <- replaceHead base (Left (st, "identity"))
+        msgs <- emptySList st
+        let erebos = Erebos
+                { erbIdentity = identity
+                , erbMessages = msgs
+                }
+
+        Right h <- replaceHead erebos (Left (st, "erebos"))
         return h
-    let sidentity = wrappedLoad (headRef idhead) :: Stored Identity
-    print $ fromStored sidentity
 
-    chan <- peerDiscovery bhost sidentity
-    void $ forever $ print =<< readChan chan
+updateErebosHead_ :: Storage -> (Stored Erebos -> IO (Stored Erebos)) -> IO ()
+updateErebosHead_ st f = updateErebosHead st (fmap (,()) . f)
+
+updateErebosHead :: Storage -> (Stored Erebos -> IO (Stored Erebos, a)) -> IO a
+updateErebosHead st f = do
+    erebosHead <- loadHead st "erebos"
+    (erebos, x) <- f $ wrappedLoad (headRef erebosHead)
+    Right _ <- replaceHead erebos (Right erebosHead)
+    return x
+
+main :: IO ()
+main = do
+    [bhost] <- getArgs
+    st <- openStorage "test"
+    erebosHead <- loadErebosHead st
+    let serebos = wrappedLoad (headRef erebosHead) :: Stored Erebos
+        self = erbIdentity $ fromStored serebos
+    print $ fromStored self
+
+    (chanPeer, chanSvc) <- startServer bhost $ erbIdentity $ fromStored serebos
+
+    void $ forkIO $ void $ forever $ do
+        peer@Peer { peerAddress = DatagramAddress addr } <- readChan chanPeer
+        print addr
+        putStrLn $ maybe "<noid>" show $ peerIdentity peer
+        if | Just powner <- finalOwner <$> peerIdentity peer
+           , _:_ <- peerChannels peer
+           -> do
+               msg <- updateErebosHead st $ \erb -> do
+                   (slist, msg) <- case find ((== powner) . msgPeer . fromStored) (storedFromSList $ erbMessages $ fromStored erb) of
+                       Just thread -> do
+                           (msg, thread') <- createDirectMessage self (fromStored thread) (T.pack "Hello")
+                           (,msg) <$> slistReplaceS thread thread' (erbMessages $ fromStored erb)
+                       Nothing -> do
+                           (msg, thread') <- createDirectMessage self (emptyDirectThread powner) (T.pack "Hello")
+                           (,msg) <$> slistAddS thread' (erbMessages $ fromStored erb)
+                   erb' <- wrappedStore st (fromStored erb) { erbMessages = slist }
+                   return (erb', msg)
+               sendToPeer self peer (T.pack "dmsg") msg
+
+           | otherwise -> return ()
+
+    void $ forever $ readChan chanSvc >>= \case
+        (peer, svc, ref)
+            | svc == T.pack "dmsg" -> do
+                let msg = wrappedLoad ref
+                putStr "Direct message from: "
+                T.putStrLn $ fromMaybe (T.pack "<unnamed>") $ idName $ fromStored $ signedData $ fromStored $ msgFrom $ fromStored msg
+                if | Just powner <- finalOwner <$> peerIdentity peer
+                   , powner == msgFrom (fromStored msg)
+                   -> updateErebosHead_ st $ \erb -> do
+                          slist <- case find ((== powner) . msgPeer . fromStored) (storedFromSList $ erbMessages $ fromStored erb) of
+                                        Just thread -> do thread' <- wrappedStore st (fromStored thread) { msgHead = msg : msgHead (fromStored thread) }
+                                                          slistReplaceS thread thread' $ erbMessages $ fromStored erb
+                                        Nothing -> slistAdd (emptyDirectThread powner) { msgHead = [msg] } $ erbMessages $ fromStored erb
+                          wrappedStore st (fromStored erb) { erbMessages = slist }
+
+                   | otherwise -> putStrLn $ "Owner mismatch"
+
+            | otherwise -> T.putStrLn $ T.pack "Unknown service: " `T.append` svc
+
     return ()
-- 
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