{-# OPTIONS --safe #-}

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

open import Ledger.Prelude
open import Ledger.Conway.Gov.Base

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

open import Ledger.Conway.Gov.Actions gs


record EnactEnv : Type where
  field
    gid       : GovActionID
    treasury  : Coin
    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   : RwdAddr ⇀ Coin


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

  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 {TriggerHF}        h = just h
getHash {ChangePParams}    h = just h
getHash {TreasuryWdrl}     _ = 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 (TriggerHF)        = just (es .pv .proj₂)
getHashES es (ChangePParams)    = just (es .pparams .proj₂)
getHashES es (TreasuryWdrl)     = nothing
getHashES es Info               = nothing


data


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


open EnactState

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

instance
  _ = +-0-monoid


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


  Enact-NoConf :
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Enact.html#2397}{\htmlId{2615}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2386}{\htmlId{2621}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2417}{\htmlId{2625}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Gov.Actions.html#710}{\htmlId{2638}{\htmlClass{InductiveConstructor}{\text{NoConfidence}}}}\, \\ \,\htmlId{2653}{\htmlClass{Symbol}{\text{\_}}}\, \end{pmatrix}$ ,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
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Enact.html#2397}{\htmlId{2932}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2386}{\htmlId{2938}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2417}{\htmlId{2942}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Gov.Actions.html#745}{\htmlId{2955}{\htmlClass{InductiveConstructor}{\text{UpdateCommittee}}}}\, \\ (\,\href{Ledger.Conway.Enact.html#2253}{\htmlId{2974}{\htmlClass{Generalizable}{\text{new}}}}\, , \,\href{Ledger.Conway.Enact.html#2280}{\htmlId{2980}{\htmlClass{Generalizable}{\text{rem}}}}\, , \,\href{Ledger.Conway.Enact.html#2301}{\htmlId{2986}{\htmlClass{Generalizable}{\text{q}}}}\,) \end{pmatrix}$ ,ENACT⦈
      record s { cc = just ((new ∪ˡ old) ∣ rem ᶜ , q) , gid }

  Enact-NewConst :
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Enact.html#2397}{\htmlId{3133}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2386}{\htmlId{3139}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2417}{\htmlId{3143}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Gov.Actions.html#780}{\htmlId{3156}{\htmlClass{InductiveConstructor}{\text{NewConstitution}}}}\, \\ (\,\href{Ledger.Conway.Enact.html#2309}{\htmlId{3175}{\htmlClass{Generalizable}{\text{dh}}}}\, , \,\href{Ledger.Conway.Enact.html#2324}{\htmlId{3180}{\htmlClass{Generalizable}{\text{sh}}}}\,) \end{pmatrix}$ ,ENACT⦈ record s { constitution = (dh , sh) , gid }


  Enact-HF :
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Enact.html#2397}{\htmlId{3305}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2386}{\htmlId{3311}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2417}{\htmlId{3315}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Gov.Actions.html#815}{\htmlId{3328}{\htmlClass{InductiveConstructor}{\text{TriggerHF}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2348}{\htmlId{3340}{\htmlClass{Generalizable}{\text{v}}}}\, \end{pmatrix}$ ,ENACT⦈ record s { pv = v , gid }

  Enact-PParams :
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Enact.html#2397}{\htmlId{3449}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2386}{\htmlId{3455}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2417}{\htmlId{3459}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Gov.Actions.html#850}{\htmlId{3472}{\htmlClass{InductiveConstructor}{\text{ChangePParams}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2232}{\htmlId{3488}{\htmlClass{Generalizable}{\text{up}}}}\, \end{pmatrix}$ ,ENACT⦈
      record s { pparams = applyUpdate (PParamsOf s) up , gid }

  Enact-Wdrl : let newWdrls = s .withdrawals ∪⁺ wdrl in
    ∑[ x ← newWdrls ] x ≤ t
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Enact.html#2397}{\htmlId{3702}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2386}{\htmlId{3708}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2417}{\htmlId{3712}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Gov.Actions.html#885}{\htmlId{3725}{\htmlClass{InductiveConstructor}{\text{TreasuryWdrl}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2362}{\htmlId{3740}{\htmlClass{Generalizable}{\text{wdrl}}}}\, \end{pmatrix}$ ,ENACT⦈ record s { withdrawals = newWdrls }

  Enact-Info :
    ───────────────────────────────────────
    $\begin{pmatrix} \,\href{Ledger.Conway.Enact.html#2397}{\htmlId{3859}{\htmlClass{Generalizable}{\text{gid}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2386}{\htmlId{3865}{\htmlClass{Generalizable}{\text{t}}}}\, \\ \,\href{Ledger.Conway.Enact.html#2417}{\htmlId{3869}{\htmlClass{Generalizable}{\text{e}}}}\, \end{pmatrix}$ ⊢ s ⇀⦇ $\begin{pmatrix} \,\href{Ledger.Conway.Gov.Actions.html#920}{\htmlId{3882}{\htmlClass{InductiveConstructor}{\text{Info}}}}\, \\ \,\htmlId{3889}{\htmlClass{Symbol}{\text{\_}}}\, \end{pmatrix}$ ,ENACT⦈ s