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Pool Reaping Transition

{-# OPTIONS --safe #-}

open import Ledger.Conway.Specification.Abstract
open import Ledger.Conway.Specification.Transaction

module Ledger.Conway.Specification.PoolReap
  (txs : _) (open TransactionStructure txs)
  (abs : AbstractFunctions txs)
  where
open import Ledger.Prelude
open import Ledger.Conway.Specification.Utxo txs abs
open import Ledger.Conway.Specification.Certs govStructure

record PoolReapState : Type where

  constructor ⟦_,_,_,_⟧ᵖ

  field
    utxoSt     : UTxOState   -- utxo state
    acnt       : Acnt        -- accounting
    dState     : DState      -- delegation state
    pState     : PState      -- pool state

instance
  unquoteDecl HasCast-PoolReapState = derive-HasCast
                [ (quote PoolReapState , HasCast-PoolReapState) ]

private variable
  e lastEpoch : Epoch
  poolReapState : PoolReapState

data

  _⊢_⇀⦇_,POOLREAP⦈_ : ⊤ → PoolReapState → Epoch → PoolReapState → Type where
  POOLREAP : let
    open PoolReapState poolReapState
    open StakePoolParams
    open UTxOState
    open PState
    open DState
    open Acnt
    open PParams

    retired    = pState .retiring ⁻¹ e
    rewardAcnts : DepositPurpose ⇀ Credential
    rewardAcnts =
      mapKeys PoolDeposit $
      mapValues rewardAccount $
      pState .pools ∣ retired

    rewardAcnts' : Credential ⇀ Coin
    rewardAcnts' = aggregateBy (rewardAcnts ˢ) (utxoSt .deposits)

    refunds : Credential ⇀ Coin
    refunds = rewardAcnts' ∣ dom (dState .rewards)

    mRefunds = rewardAcnts' ∣ dom (dState .rewards) ᶜ

    unclaimed  = getCoin mRefunds

    retiredDeposits : ℙ DepositPurpose
    retiredDeposits = mapˢ PoolDeposit retired

    utxoSt' = record utxoSt { deposits = utxoSt .deposits ∣ retiredDeposits ᶜ }

    acnt' = record acnt { treasury = acnt .treasury + unclaimed }

    dState' =
      $\begin{pmatrix} \,\href{Ledger.Conway.Specification.PoolReap.html#671}{\htmlId{1967}{\htmlClass{Function}{\text{dState}}}}\, \,\htmlId{1974}{\htmlClass{Symbol}{\text{.}}}\,\,\href{Ledger.Conway.Specification.Certs.html#4497}{\htmlId{1975}{\htmlClass{Field}{\text{voteDelegs}}}}\,
      \\ \,\href{Ledger.Conway.Specification.PoolReap.html#671}{\htmlId{1994}{\htmlClass{Function}{\text{dState}}}}\, \,\htmlId{2001}{\htmlClass{Symbol}{\text{.}}}\,\,\href{Ledger.Conway.Specification.Certs.html#4527}{\htmlId{2002}{\htmlClass{Field}{\text{stakeDelegs}}}}\, \,\href{Axiom.Set.Map.html#14509}{\htmlId{2014}{\htmlClass{Function Operator}{\text{∣\^{}}}}}\, \,\href{Ledger.Conway.Specification.PoolReap.html#1242}{\htmlId{2017}{\htmlClass{Bound}{\text{retired}}}}\, \,\href{Axiom.Set.Map.html#14509}{\htmlId{2025}{\htmlClass{Function Operator}{\text{ᶜ}}}}\,
      \\ \,\href{Ledger.Conway.Specification.PoolReap.html#671}{\htmlId{2035}{\htmlClass{Function}{\text{dState}}}}\, \,\htmlId{2042}{\htmlClass{Symbol}{\text{.}}}\,\,\href{Ledger.Conway.Specification.Certs.html#4558}{\htmlId{2043}{\htmlClass{Field}{\text{rewards}}}}\, \,\href{Axiom.Set.Map.Dec.html#2046}{\htmlId{2051}{\htmlClass{Function Operator}{\text{∪⁺}}}}\, \,\href{Ledger.Conway.Specification.PoolReap.html#1540}{\htmlId{2054}{\htmlClass{Bound}{\text{refunds}}}}\,
      \end{pmatrix}$

    pState' = $\begin{pmatrix} \,\href{Ledger.Conway.Specification.PoolReap.html#720}{\htmlId{2087}{\htmlClass{Function}{\text{pState}}}}\, \,\htmlId{2094}{\htmlClass{Symbol}{\text{.}}}\,\,\href{Ledger.Conway.Specification.Certs.html#4621}{\htmlId{2095}{\htmlClass{Field}{\text{pools}}}}\, \,\href{Axiom.Set.Map.html#10748}{\htmlId{2101}{\htmlClass{Function Operator}{\text{∣}}}}\, \,\href{Ledger.Conway.Specification.PoolReap.html#1242}{\htmlId{2103}{\htmlClass{Bound}{\text{retired}}}}\, \,\href{Axiom.Set.Map.html#10748}{\htmlId{2111}{\htmlClass{Function Operator}{\text{ᶜ}}}}\, \\ \,\href{Ledger.Conway.Specification.PoolReap.html#720}{\htmlId{2115}{\htmlClass{Function}{\text{pState}}}}\, \,\htmlId{2122}{\htmlClass{Symbol}{\text{.}}}\,\,\href{Ledger.Conway.Specification.Certs.html#4643}{\htmlId{2123}{\htmlClass{Field}{\text{retiring}}}}\, \,\href{Axiom.Set.Map.html#10748}{\htmlId{2132}{\htmlClass{Function Operator}{\text{∣}}}}\, \,\href{Ledger.Conway.Specification.PoolReap.html#1242}{\htmlId{2134}{\htmlClass{Bound}{\text{retired}}}}\, \,\href{Axiom.Set.Map.html#10748}{\htmlId{2142}{\htmlClass{Function Operator}{\text{ᶜ}}}}\, \end{pmatrix}$

    in
    ────────────────────────────────
    _ ⊢ $\begin{pmatrix} \,\href{Ledger.Conway.Specification.PoolReap.html#585}{\htmlId{2201}{\htmlClass{Function}{\text{utxoSt}}}}\, \\ \,\href{Ledger.Conway.Specification.PoolReap.html#628}{\htmlId{2210}{\htmlClass{Function}{\text{acnt}}}}\, \\ \,\href{Ledger.Conway.Specification.PoolReap.html#671}{\htmlId{2217}{\htmlClass{Function}{\text{dState}}}}\, \\ \,\href{Ledger.Conway.Specification.PoolReap.html#720}{\htmlId{2226}{\htmlClass{Function}{\text{pState}}}}\, \end{pmatrix}$ ⇀⦇ e ,POOLREAP⦈ $\begin{pmatrix} \,\href{Ledger.Conway.Specification.PoolReap.html#1801}{\htmlId{2253}{\htmlClass{Bound}{\text{utxoSt'}}}}\, \\ \,\href{Ledger.Conway.Specification.PoolReap.html#1882}{\htmlId{2263}{\htmlClass{Bound}{\text{acnt'}}}}\, \\ \,\href{Ledger.Conway.Specification.PoolReap.html#1949}{\htmlId{2271}{\htmlClass{Bound}{\text{dState'}}}}\, \\ \,\href{Ledger.Conway.Specification.PoolReap.html#2075}{\htmlId{2281}{\htmlClass{Bound}{\text{pState'}}}}\, \end{pmatrix}$