{-# LANGUAGE OverloadedStrings #-}

module Server where

import Control.Concurrent (forkIO, threadDelay)
import Control.Exception (throwIO, try)
import Control.Monad (forever, when)
import Data.Configurator
import Network.Wai.Handler.Warp (run)
import Servant
import ZcashHaskell.Types (ZebraGetBlockChainInfo(..), ZebraGetInfo(..))
import Zenith.Core (checkBlockChain, checkZebra)
import Zenith.DB (initDb)
import Zenith.RPC
  ( State(..)
  , ZenithRPC(..)
  , authenticate
  , scanZebra
  , zenithServer
  )
import Zenith.Scanner (rescanZebra)
import Zenith.Types (Config(..))

main :: IO ()
main = do
  config <- load ["$(HOME)/Zenith/zenith.cfg"]
  dbFilePath <- require config "dbFilePath"
  nodeUser <- require config "nodeUser"
  nodePwd <- require config "nodePwd"
  zebraPort <- require config "zebraPort"
  zebraHost <- require config "zebraHost"
  nodePort <- require config "nodePort"
  let myConfig = Config dbFilePath zebraHost zebraPort nodeUser nodePwd nodePort
  let ctx = authenticate myConfig :. EmptyContext
  w <- try $ checkZebra zebraHost zebraPort :: IO (Either IOError ZebraGetInfo)
  case w of
    Right zebra -> do
      bc <-
        try $ checkBlockChain zebraHost zebraPort :: IO
          (Either IOError ZebraGetBlockChainInfo)
      case bc of
        Left e1 -> throwIO e1
        Right chainInfo -> do
          x <- initDb dbFilePath
          case x of
            Left e2 -> throwIO $ userError e2
            Right x' -> do
              when x' $ rescanZebra zebraHost zebraPort dbFilePath
              _ <-
                forkIO $
                forever $ do
                  _ <-
                    scanZebra dbFilePath zebraHost zebraPort (zgb_net chainInfo)
                  threadDelay 90000000
              let myState =
                    State
                      (zgb_net chainInfo)
                      zebraHost
                      zebraPort
                      dbFilePath
                      (zgi_build zebra)
                      (zgb_blocks chainInfo)
              run nodePort $
                serveWithContext
                  (Proxy :: Proxy ZenithRPC)
                  ctx
                  (zenithServer myState)