module Peras.Conformance.Params where

open import Data.Nat

{-# FOREIGN AGDA2HS
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
#-}

{-# FOREIGN AGDA2HS
import Data.Aeson (FromJSON, ToJSON)
import qualified Data.Aeson as A
import Data.Default (Default (..))
import GHC.Generics (Generic)
#-}

open import Haskell.Prelude

record PerasParams : Set where
  constructor MkPerasParams
  field
    perasU : ℕ
    -- ^ Round length, in slots
    perasA : ℕ
    -- ^ Certificate expiration age, in slots
    perasR : ℕ
    -- ^ Length of chain-ignorance period, in rounds
    perasK : ℕ
    -- ^ Length of cool-down period, in rounds
    perasL : ℕ
    -- ^ Minimum age for voted block, in slots
    perasτ : ℕ
    -- ^ Quorum size, as a percentage of total expected votes
    perasB : ℕ
    -- ^ Certificate boost, in blocks
    perasT : ℕ
    -- ^ Termination bound for block selection, in slots
    perasΔ : ℕ
    -- ^ Delivery guarantee for diffusion, in slots
    @ ⦃ perasNonZeroU ⦄ : NonZero perasU
    @ ⦃ perasNonZeroK ⦄ : NonZero perasK

{-# FOREIGN AGDA2HS
data PerasParams = MkPerasParams{perasU :: Integer,
                                 perasA :: Integer, perasR :: Integer, perasK :: Integer,
                                 perasL :: Integer, perasτ :: Integer, perasB :: Integer,
                                 perasT :: Integer, perasΔ :: Integer}
  deriving (Eq, Generic, Show)
#-}

open PerasParams public

defaultPerasParams : PerasParams
defaultPerasParams =
  record
    { perasU = 
    ; perasA = 
    ; perasR = 
    ; perasK = 
    ; perasL = 
    ; perasτ = 
    ; perasB = 
    ; perasT = 
    ; perasΔ = 
    }


{-# COMPILE AGDA2HS defaultPerasParams #-}

{-# FOREIGN AGDA2HS

instance FromJSON PerasParams where
  parseJSON =
    A.withObject "PerasParams" $ \o -> do
      perasU <- o A..: "U"
      perasA <- o A..: "A"
      perasR <- o A..: "R"
      perasK <- o A..: "K"
      perasL <- o A..: "L"
      perasτ <- o A..: "τ"
      perasB <- o A..: "B"
      perasT <- o A..: "T"
      perasΔ <- o A..: "Δ"
      pure MkPerasParams{..}

instance ToJSON PerasParams where
  toJSON MkPerasParams{..} =
    A.object
      [ "U" A..= perasU
      , "A" A..= perasA
      , "R" A..= perasR
      , "K" A..= perasK
      , "L" A..= perasL
      , "τ" A..= perasτ
      , "B" A..= perasB
      , "T" A..= perasT
      , "Δ" A..= perasΔ
      ]

-- FIXME: What are the actual values of T_heal, T_CQ, and T_CP?
-- For now I am assuming they all are in the order of security parameter, eg.  on mainnet.
instance Default PerasParams where
  def = defaultPerasParams
#-}