{-# LANGUAGE OverloadedStrings #-}

-- | Core wallet functionality for Zenith
module Zenith.Core where

import Control.Exception (throwIO)
import Data.Aeson
import Data.HexString (hexString)
import qualified Data.Text as T
import Database.Persist
import Network.HTTP.Client
import ZcashHaskell.Keys
import ZcashHaskell.Orchard
  ( encodeUnifiedAddress
  , genOrchardReceiver
  , genOrchardSpendingKey
  )
import ZcashHaskell.Sapling
  ( genSaplingInternalAddress
  , genSaplingPaymentAddress
  , genSaplingSpendingKey
  )
import ZcashHaskell.Transparent (genTransparentPrvKey, genTransparentReceiver)
import ZcashHaskell.Types
import ZcashHaskell.Utils
import Zenith.DB
import Zenith.Types
  ( OrchardSpendingKeyDB(..)
  , PhraseDB(..)
  , SaplingSpendingKeyDB(..)
  , ScopeDB(..)
  , TransparentSpendingKeyDB(..)
  , UnifiedAddressDB(..)
  , ZcashNetDB(..)
  , ZebraTreeInfo(..)
  )

-- * Zebra Node interaction
-- | Checks the status of the `zebrad` node
checkZebra ::
     T.Text -- ^ Host where `zebrad` is available
  -> Int -- ^ Port where `zebrad` is available 
  -> IO ZebraGetInfo
checkZebra nodeHost nodePort = do
  res <- makeZebraCall nodeHost nodePort "getinfo" []
  case res of
    Left e -> throwIO $ userError e
    Right bi -> return bi

-- | Checks the status of the Zcash blockchain
checkBlockChain ::
     T.Text -- ^ Host where `zebrad` is available
  -> Int -- ^ Port where `zebrad` is available
  -> IO ZebraGetBlockChainInfo
checkBlockChain nodeHost nodePort = do
  r <- makeZebraCall nodeHost nodePort "getblockchaininfo" []
  case r of
    Left e -> throwIO $ userError e
    Right bci -> return bci

-- | Get commitment trees from Zebra
getCommitmentTrees ::
     T.Text -- ^ Host where `zebrad` is avaiable
  -> Int -- ^ Port where `zebrad` is available
  -> Int -- ^ Block height
  -> IO ZebraTreeInfo
getCommitmentTrees nodeHost nodePort block = do
  r <-
    makeZebraCall
      nodeHost
      nodePort
      "z_gettreestate"
      [Data.Aeson.String $ T.pack $ show block]
  case r of
    Left e -> throwIO $ userError e
    Right zti -> return zti

-- * Spending Keys
-- | Create an Orchard Spending Key for the given wallet and account index
createOrchardSpendingKey :: ZcashWallet -> Int -> IO OrchardSpendingKey
createOrchardSpendingKey zw i = do
  let s = getWalletSeed $ getPhrase $ zcashWalletSeedPhrase zw
  case s of
    Nothing -> throwIO $ userError "Unable to generate seed"
    Just s' -> do
      let coinType =
            case getNet $ zcashWalletNetwork zw of
              MainNet -> MainNetCoin
              TestNet -> TestNetCoin
              RegTestNet -> RegTestNetCoin
      let r = genOrchardSpendingKey s' coinType i
      case r of
        Nothing -> throwIO $ userError "Unable to generate Orchard spending key"
        Just sk -> return sk

-- | Create a Sapling spending key for the given wallet and account index
createSaplingSpendingKey :: ZcashWallet -> Int -> IO SaplingSpendingKey
createSaplingSpendingKey zw i = do
  let s = getWalletSeed $ getPhrase $ zcashWalletSeedPhrase zw
  case s of
    Nothing -> throwIO $ userError "Unable to generate seed"
    Just s' -> do
      let coinType =
            case getNet $ zcashWalletNetwork zw of
              MainNet -> MainNetCoin
              TestNet -> TestNetCoin
              RegTestNet -> RegTestNetCoin
      let r = genSaplingSpendingKey s' coinType i
      case r of
        Nothing -> throwIO $ userError "Unable to generate Sapling spending key"
        Just sk -> return sk

createTransparentSpendingKey :: ZcashWallet -> Int -> IO TransparentSpendingKey
createTransparentSpendingKey zw i = do
  let s = getWalletSeed $ getPhrase $ zcashWalletSeedPhrase zw
  case s of
    Nothing -> throwIO $ userError "Unable to generate seed"
    Just s' -> do
      let coinType =
            case getNet $ zcashWalletNetwork zw of
              MainNet -> MainNetCoin
              TestNet -> TestNetCoin
              RegTestNet -> RegTestNetCoin
      genTransparentPrvKey s' coinType i

-- * Accounts
-- | Create an account for the given wallet and account index
createZcashAccount ::
     T.Text -- ^ The account's name
  -> Int -- ^ The account's index
  -> Entity ZcashWallet -- ^ The Zcash wallet that this account will be attached to
  -> IO ZcashAccount
createZcashAccount n i zw = do
  orSk <- createOrchardSpendingKey (entityVal zw) i
  sapSk <- createSaplingSpendingKey (entityVal zw) i
  tSk <- createTransparentSpendingKey (entityVal zw) i
  return $
    ZcashAccount
      i
      (entityKey zw)
      n
      (OrchardSpendingKeyDB orSk)
      (SaplingSpendingKeyDB sapSk)
      (TransparentSpendingKeyDB tSk)

-- * Addresses
-- | Create an external unified address for the given account and index
createWalletAddress ::
     T.Text -- ^ The address nickname
  -> Int -- ^ The address' index
  -> ZcashNet -- ^ The network for this address
  -> Scope -- ^ External or Internal
  -> Entity ZcashAccount -- ^ The Zcash account that the address will be attached to
  -> IO WalletAddress
createWalletAddress n i zNet scope za = do
  let oRec =
        genOrchardReceiver i scope $
        getOrchSK $ zcashAccountOrchSpendKey $ entityVal za
  let sRec =
        case scope of
          External ->
            genSaplingPaymentAddress i $
            getSapSK $ zcashAccountSapSpendKey $ entityVal za
          Internal ->
            genSaplingInternalAddress $
            getSapSK $ zcashAccountSapSpendKey $ entityVal za
  tRec <-
    genTransparentReceiver i scope $
    getTranSK $ zcashAccountTPrivateKey $ entityVal za
  return $
    WalletAddress
      i
      (entityKey za)
      n
      (UnifiedAddressDB $
       encodeUnifiedAddress $ UnifiedAddress zNet oRec sRec (Just tRec))
      (ScopeDB scope)

-- * Wallet
-- | Sync the wallet with the data store
syncWallet ::
     T.Text -- ^ The database path
  -> Entity ZcashWallet
  -> IO String
syncWallet walletDb w = do
  accs <- getAccounts walletDb $ entityKey w
  addrs <- concat <$> mapM (getAddresses walletDb . entityKey) accs
  lastBlock <- getMaxWalletBlock walletDb
  trNotes <- mapM (findTransparentNotes walletDb lastBlock . entityVal) addrs
  sapNotes <-
    mapM
      (findSaplingOutputs walletDb lastBlock (zcashWalletNetwork $ entityVal w) .
       zcashAccountSapSpendKey . entityVal)
      accs
  print "Transparent Notes: "
  print trNotes
  print "Sapling notes: "
  print sapNotes
  return "Testing"