{-# OPTIONS --safe #-}

open import Data.Nat.Properties using (+-0-monoid)
open import Data.Rational using (ℚ)

open import Ledger.Prelude
open import Ledger.Conway.Specification.Gov.Base
open import Ledger.Core.Specification.ProtocolVersion

module Ledger.Conway.Specification.Enact (gs : _) (open GovStructure gs) where

open import Ledger.Conway.Specification.Gov.Actions gs


record EnactEnv : Type where
  field
    gid       : GovActionID
    treasury  : Treasury
    epoch     : Epoch

record EnactState : Type where
  field
    cc            : HashProtected (Maybe ((Credential ⇀ Epoch) × ℚ))
    constitution  : HashProtected (DocHash × Maybe ScriptHash)
    pv            : HashProtected ProtVer
    pparams       : HashProtected PParams
    withdrawals   : Withdrawals


record HasEnactState {a} (A : Type a) : Type a where
  field EnactStateOf : A → EnactState
open HasEnactState ⦃...⦄ public

instance
  HasPParams-EnactState : HasPParams EnactState
  HasPParams-EnactState .PParamsOf = proj₁ ∘ EnactState.pparams

  HasccMaxTermLength-EnactState : HasCCMaxTermLength EnactState
  HasccMaxTermLength-EnactState .CCMaxTermLengthOf = PParams.ccMaxTermLength ∘ PParamsOf

  HasWithdrawals-EnactState : HasWithdrawals EnactState
  HasWithdrawals-EnactState .WithdrawalsOf = EnactState.withdrawals

  unquoteDecl HasCast-EnactEnv = derive-HasCast
    [ (quote EnactEnv , HasCast-EnactEnv) ]

open EnactState


ccCreds : HashProtected (Maybe ((Credential ⇀ Epoch) × ℚ)) → ℙ Credential
ccCreds (just x   , _)  = dom (x .proj₁)
ccCreds (nothing  , _)  = ∅

getHash : ∀ {a} → NeedsHash a → Maybe GovActionID
getHash {NoConfidence}        h = just h
getHash {UpdateCommittee}     h = just h
getHash {NewConstitution}     h = just h
getHash {TriggerHardFork}     h = just h
getHash {ChangePParams}       h = just h
getHash {TreasuryWithdrawal}  _ = nothing
getHash {Info}                _ = nothing

getHashES : EnactState → GovActionType → Maybe GovActionID
getHashES es NoConfidence          = just (es .cc .proj₂)
getHashES es (UpdateCommittee)     = just (es .cc .proj₂)
getHashES es (NewConstitution)     = just (es .constitution .proj₂)
getHashES es (TriggerHardFork)     = just (es .pv .proj₂)
getHashES es (ChangePParams)       = just (es .pparams .proj₂)
getHashES es (TreasuryWithdrawal)  = nothing
getHashES es Info                  = nothing


data _⊢_⇀⦇_,ENACT⦈_ : EnactEnv → EnactState → GovAction → EnactState → Type


private variable
  s : EnactState
  up : PParamsUpdate
  new : Credential ⇀ Epoch
  rem : ℙ Credential
  q : ℚ
  dh : DocHash
  sh : Maybe ScriptHash
  v : ProtVer
  wdrl : Withdrawals
  t : Treasury
  gid : GovActionID
  e : Epoch

instance
  _ = +-0-monoid


open PParams using (ccMaxTermLength)
open EnactState using (cc)
data _⊢_⇀⦇_,ENACT⦈_ where


  Enact-NoConf :
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Enact.html#2640}{\htmlId{2858}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2625}{\htmlId{2864}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2660}{\htmlId{2868}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Gov.Actions.html#710}{\htmlId{2881}{\htmlClass{InductiveConstructor}{\text{NoConfidence}}}}\, \\ \,\htmlId{2896}{\htmlClass{Symbol}{\text{\_}}}\, \end{pmatrix}$ ,ENACT⦈ record s { cc = nothing , gid }

  Enact-UpdComm : let old      = maybe proj₁ ∅ (s .cc .proj₁)
                      maxTerm  = CCMaxTermLengthOf s +ᵉ e
                  in
    ∀[ term ∈ range new ] term ≤ maxTerm
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Enact.html#2640}{\htmlId{3175}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2625}{\htmlId{3181}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2660}{\htmlId{3185}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Gov.Actions.html#748}{\htmlId{3198}{\htmlClass{InductiveConstructor}{\text{UpdateCommittee}}}}\, \\ \,\htmlId{3216}{\htmlClass{Symbol}{\text{(}}}\,\,\href{Ledger.Conway.Specification.Enact.html#2495}{\htmlId{3217}{\htmlClass{Generalizable}{\text{new}}}}\, , \,\href{Ledger.Conway.Specification.Enact.html#2522}{\htmlId{3223}{\htmlClass{Generalizable}{\text{rem}}}}\, , \,\href{Ledger.Conway.Specification.Enact.html#2543}{\htmlId{3229}{\htmlClass{Generalizable}{\text{q}}}}\,\,\htmlId{3230}{\htmlClass{Symbol}{\text{)}}}\, \end{pmatrix}$ ,ENACT⦈
      record s { cc = just ((new ∪ˡ old) ∣ rem ᶜ , q) , gid }

  Enact-NewConst :
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Enact.html#2640}{\htmlId{3376}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2625}{\htmlId{3382}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2660}{\htmlId{3386}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Gov.Actions.html#786}{\htmlId{3399}{\htmlClass{InductiveConstructor}{\text{NewConstitution}}}}\, \\ \,\htmlId{3417}{\htmlClass{Symbol}{\text{(}}}\,\,\href{Ledger.Conway.Specification.Enact.html#2551}{\htmlId{3418}{\htmlClass{Generalizable}{\text{dh}}}}\, , \,\href{Ledger.Conway.Specification.Enact.html#2566}{\htmlId{3423}{\htmlClass{Generalizable}{\text{sh}}}}\,\,\htmlId{3425}{\htmlClass{Symbol}{\text{)}}}\, \end{pmatrix}$ ,ENACT⦈ record s { constitution = (dh , sh) , gid }

  Enact-HF :
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Enact.html#2640}{\htmlId{3547}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2625}{\htmlId{3553}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2660}{\htmlId{3557}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Gov.Actions.html#824}{\htmlId{3570}{\htmlClass{InductiveConstructor}{\text{TriggerHardFork}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2590}{\htmlId{3588}{\htmlClass{Generalizable}{\text{v}}}}\, \end{pmatrix}$ ,ENACT⦈ record s { pv = v , gid }

  Enact-PParams :
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Enact.html#2640}{\htmlId{3697}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2625}{\htmlId{3703}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2660}{\htmlId{3707}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Gov.Actions.html#862}{\htmlId{3720}{\htmlClass{InductiveConstructor}{\text{ChangePParams}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2474}{\htmlId{3736}{\htmlClass{Generalizable}{\text{up}}}}\, \end{pmatrix}$ ,ENACT⦈
      record s { pparams = applyUpdate (PParamsOf s) up , gid }

  Enact-Wdrl : let newWdrls = s .withdrawals ∪⁺ wdrl in
    ∑[ x ← newWdrls ] x ≤ t
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Enact.html#2640}{\htmlId{3950}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2625}{\htmlId{3956}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2660}{\htmlId{3960}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Gov.Actions.html#900}{\htmlId{3973}{\htmlClass{InductiveConstructor}{\text{TreasuryWithdrawal}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2604}{\htmlId{3994}{\htmlClass{Generalizable}{\text{wdrl}}}}\, \end{pmatrix}$ ,ENACT⦈ record s { withdrawals = newWdrls }

  Enact-Info :
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Enact.html#2640}{\htmlId{4113}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2625}{\htmlId{4119}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Specification.Enact.html#2660}{\htmlId{4123}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Specification.Gov.Actions.html#938}{\htmlId{4136}{\htmlClass{InductiveConstructor}{\text{Info}}}}\, \\ \,\htmlId{4143}{\htmlClass{Symbol}{\text{\_}}}\, \end{pmatrix}$ ,ENACT⦈ s