(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
(*                                                                           *)
(* Permission is hereby granted, free of charge, to any person obtaining a   *)
(* copy of this software and associated documentation files (the "Software"),*)
(* to deal in the Software without restriction, including without limitation *)
(* the rights to use, copy, modify, merge, publish, distribute, sublicense,  *)
(* and/or sell copies of the Software, and to permit persons to whom the     *)
(* Software is furnished to do so, subject to the following conditions:      *)
(*                                                                           *)
(* The above copyright notice and this permission notice shall be included   *)
(* in all copies or substantial portions of the Software.                    *)
(*                                                                           *)
(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR*)
(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,  *)
(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL   *)
(* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER*)
(* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING   *)
(* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER       *)
(* DEALINGS IN THE SOFTWARE.                                                 *)
(*                                                                           *)
(*****************************************************************************)

type balance =
  | Contract of Contract_repr.t
  | Rewards of Signature.Public_key_hash.t * Cycle_repr.t
  | Fees of Signature.Public_key_hash.t * Cycle_repr.t
  | Deposits of Signature.Public_key_hash.t * Cycle_repr.t

let balance_encoding =
  let open Data_encoding in
  def "operation_metadata.alpha.balance"
  @@ union
       [ case
           (Tag 0)
           ~title:"Contract"
           (obj2
              (req "kind" (constant "contract"))
              (req "contract" Contract_repr.encoding))
           (function Contract c -> Some ((), c) | _ -> None)
           (fun ((), c) -> Contract c);
         case
           (Tag 1)
           ~title:"Rewards"
           (obj4
              (req "kind" (constant "freezer"))
              (req "category" (constant "rewards"))
              (req "delegate" Signature.Public_key_hash.encoding)
              (req "cycle" Cycle_repr.encoding))
           (function Rewards (d, l) -> Some ((), (), d, l) | _ -> None)
           (fun ((), (), d, l) -> Rewards (d, l));
         case
           (Tag 2)
           ~title:"Fees"
           (obj4
              (req "kind" (constant "freezer"))
              (req "category" (constant "fees"))
              (req "delegate" Signature.Public_key_hash.encoding)
              (req "cycle" Cycle_repr.encoding))
           (function Fees (d, l) -> Some ((), (), d, l) | _ -> None)
           (fun ((), (), d, l) -> Fees (d, l));
         case
           (Tag 3)
           ~title:"Deposits"
           (obj4
              (req "kind" (constant "freezer"))
              (req "category" (constant "deposits"))
              (req "delegate" Signature.Public_key_hash.encoding)
              (req "cycle" Cycle_repr.encoding))
           (function Deposits (d, l) -> Some ((), (), d, l) | _ -> None)
           (fun ((), (), d, l) -> Deposits (d, l)) ]

type balance_update = Debited of Tez_repr.t | Credited of Tez_repr.t

let balance_update_encoding =
  let open Data_encoding in
  def "operation_metadata.alpha.balance_update"
  @@ obj1
       (req
          "change"
          (conv
             (function
               | Credited v ->
                   Tez_repr.to_mutez v
               | Debited v ->
                   Int64.neg (Tez_repr.to_mutez v))
             ( Json.wrap_error
             @@ fun v ->
             if Compare.Int64.(v < 0L) then
               match Tez_repr.of_mutez (Int64.neg v) with
               | Some v ->
                   Debited v
               | None ->
                   failwith "Qty.of_mutez"
             else
               match Tez_repr.of_mutez v with
               | Some v ->
                   Credited v
               | None ->
                   failwith "Qty.of_mutez" )
             int64))

type balance_updates = (balance * balance_update) list

let balance_updates_encoding =
  let open Data_encoding in
  def "operation_metadata.alpha.balance_updates"
  @@ list (merge_objs balance_encoding balance_update_encoding)

let cleanup_balance_updates balance_updates =
  List.filter
    (fun (_, (Credited update | Debited update)) ->
      not (Tez_repr.equal update Tez_repr.zero))
    balance_updates

type frozen_balance = {
  deposit : Tez_repr.t;
  fees : Tez_repr.t;
  rewards : Tez_repr.t;
}

let frozen_balance_encoding =
  let open Data_encoding in
  conv
    (fun {deposit; fees; rewards} -> (deposit, fees, rewards))
    (fun (deposit, fees, rewards) -> {deposit; fees; rewards})
    (obj3
       (req "deposit" Tez_repr.encoding)
       (req "fees" Tez_repr.encoding)
       (req "rewards" Tez_repr.encoding))

type error +=
  | No_deletion of Signature.Public_key_hash.t (* `Permanent *)
  | Active_delegate (* `Temporary *)
  | Current_delegate (* `Temporary *)
  | Empty_delegate_account of Signature.Public_key_hash.t (* `Temporary *)
  | Balance_too_low_for_deposit of {
      delegate : Signature.Public_key_hash.t;
      deposit : Tez_repr.t;
      balance : Tez_repr.t;
    }

(* `Temporary *)

let () =
  register_error_kind
    `Permanent
    ~id:"delegate.no_deletion"
    ~title:"Forbidden delegate deletion"
    ~description:"Tried to unregister a delegate"
    ~pp:(fun ppf delegate ->
      Format.fprintf
        ppf
        "Delegate deletion is forbidden (%a)"
        Signature.Public_key_hash.pp
        delegate)
    Data_encoding.(obj1 (req "delegate" Signature.Public_key_hash.encoding))
    (function No_deletion c -> Some c | _ -> None)
    (fun c -> No_deletion c) ;
  register_error_kind
    `Temporary
    ~id:"delegate.already_active"
    ~title:"Delegate already active"
    ~description:"Useless delegate reactivation"
    ~pp:(fun ppf () ->
      Format.fprintf ppf "The delegate is still active, no need to refresh it")
    Data_encoding.empty
    (function Active_delegate -> Some () | _ -> None)
    (fun () -> Active_delegate) ;
  register_error_kind
    `Temporary
    ~id:"delegate.unchanged"
    ~title:"Unchanged delegated"
    ~description:"Contract already delegated to the given delegate"
    ~pp:(fun ppf () ->
      Format.fprintf
        ppf
        "The contract is already delegated to the same delegate")
    Data_encoding.empty
    (function Current_delegate -> Some () | _ -> None)
    (fun () -> Current_delegate) ;
  register_error_kind
    `Permanent
    ~id:"delegate.empty_delegate_account"
    ~title:"Empty delegate account"
    ~description:
      "Cannot register a delegate when its implicit account is empty"
    ~pp:(fun ppf delegate ->
      Format.fprintf
        ppf
        "Delegate registration is forbidden when the delegate\n\
        \           implicit account is empty (%a)"
        Signature.Public_key_hash.pp
        delegate)
    Data_encoding.(obj1 (req "delegate" Signature.Public_key_hash.encoding))
    (function Empty_delegate_account c -> Some c | _ -> None)
    (fun c -> Empty_delegate_account c) ;
  register_error_kind
    `Temporary
    ~id:"delegate.balance_too_low_for_deposit"
    ~title:"Balance too low for deposit"
    ~description:"Cannot freeze deposit when the balance is too low"
    ~pp:(fun ppf (delegate, balance, deposit) ->
      Format.fprintf
        ppf
        "Delegate %a has a too low balance (%a) to deposit %a"
        Signature.Public_key_hash.pp
        delegate
        Tez_repr.pp
        balance
        Tez_repr.pp
        deposit)
    Data_encoding.(
      obj3
        (req "delegate" Signature.Public_key_hash.encoding)
        (req "balance" Tez_repr.encoding)
        (req "deposit" Tez_repr.encoding))
    (function
      | Balance_too_low_for_deposit {delegate; balance; deposit} ->
          Some (delegate, balance, deposit)
      | _ ->
          None)
    (fun (delegate, balance, deposit) ->
      Balance_too_low_for_deposit {delegate; balance; deposit})

let link c contract delegate =
  Storage.Contract.Balance.get c contract
  >>=? fun balance ->
  Roll_storage.Delegate.add_amount c delegate balance
  >>=? fun c ->
  Storage.Contract.Delegated.add
    (c, Contract_repr.implicit_contract delegate)
    contract
  >>= fun c -> return c

let unlink c contract =
  Storage.Contract.Balance.get c contract
  >>=? fun balance ->
  Storage.Contract.Delegate.get_option c contract
  >>=? function
  | None ->
      return c
  | Some delegate ->
      (* Removes the balance of the contract from the delegate *)
      Roll_storage.Delegate.remove_amount c delegate balance
      >>=? fun c ->
      Storage.Contract.Delegated.del
        (c, Contract_repr.implicit_contract delegate)
        contract
      >>= fun c -> return c

let known c delegate =
  Storage.Contract.Manager.get_option
    c
    (Contract_repr.implicit_contract delegate)
  >>=? function
  | None | Some (Manager_repr.Hash _) ->
      return_false
  | Some (Manager_repr.Public_key _) ->
      return_true

(* A delegate is registered if its "implicit account" delegates to itself. *)
let registered c delegate =
  Storage.Contract.Delegate.get_option
    c
    (Contract_repr.implicit_contract delegate)
  >>=? function
  | Some current_delegate ->
      return @@ Signature.Public_key_hash.equal delegate current_delegate
  | None ->
      return_false

let init ctxt contract delegate =
  known ctxt delegate
  >>=? fun known_delegate ->
  fail_unless known_delegate (Roll_storage.Unregistered_delegate delegate)
  >>=? fun () ->
  registered ctxt delegate
  >>=? fun is_registered ->
  fail_unless is_registered (Roll_storage.Unregistered_delegate delegate)
  >>=? fun () ->
  Storage.Contract.Delegate.init ctxt contract delegate
  >>=? fun ctxt -> link ctxt contract delegate

let get = Roll_storage.get_contract_delegate

let set c contract delegate =
  match delegate with
  | None -> (
      let delete () =
        unlink c contract
        >>=? fun c ->
        Storage.Contract.Delegate.remove c contract >>= fun c -> return c
      in
      match Contract_repr.is_implicit contract with
      | Some pkh ->
          (* check if contract is a registered delegate *)
          registered c pkh
          >>=? fun is_registered ->
          if is_registered then fail (No_deletion pkh) else delete ()
      | None ->
          delete () )
  | Some delegate ->
      known c delegate
      >>=? fun known_delegate ->
      registered c delegate
      >>=? fun registered_delegate ->
      let self_delegation =
        match Contract_repr.is_implicit contract with
        | Some pkh ->
            Signature.Public_key_hash.equal pkh delegate
        | None ->
            false
      in
      if (not known_delegate) || not (registered_delegate || self_delegation)
      then fail (Roll_storage.Unregistered_delegate delegate)
      else
        Storage.Contract.Delegate.get_option c contract
        >>=? (function
               | Some current_delegate
                 when Signature.Public_key_hash.equal delegate current_delegate
                 ->
                   if self_delegation then
                     Roll_storage.Delegate.is_inactive c delegate
                     >>=? function
                     | true -> return_unit | false -> fail Active_delegate
                   else fail Current_delegate
               | None | Some _ ->
                   return_unit)
        >>=? fun () ->
        (* check if contract is a registered delegate *)
        ( match Contract_repr.is_implicit contract with
        | Some pkh ->
            registered c pkh
            >>=? fun is_registered ->
            (* allow self-delegation to re-activate *)
            if (not self_delegation) && is_registered then
              fail (No_deletion pkh)
            else return_unit
        | None ->
            return_unit )
        >>=? fun () ->
        Storage.Contract.Balance.mem c contract
        >>= fun exists ->
        fail_when
          (self_delegation && not exists)
          (Empty_delegate_account delegate)
        >>=? fun () ->
        unlink c contract
        >>=? fun c ->
        Storage.Contract.Delegate.init_set c contract delegate
        >>= fun c ->
        link c contract delegate
        >>=? fun c ->
        ( if self_delegation then
          Storage.Delegates.add c delegate
          >>= fun c ->
          Roll_storage.Delegate.set_active c delegate >>=? fun c -> return c
        else return c )
        >>=? fun c -> return c

let remove ctxt contract = unlink ctxt contract

let delegated_contracts ctxt delegate =
  let contract = Contract_repr.implicit_contract delegate in
  Storage.Contract.Delegated.elements (ctxt, contract)

let get_frozen_deposit ctxt contract cycle =
  Storage.Contract.Frozen_deposits.get_option (ctxt, contract) cycle
  >>=? function None -> return Tez_repr.zero | Some frozen -> return frozen

let credit_frozen_deposit ctxt delegate cycle amount =
  let contract = Contract_repr.implicit_contract delegate in
  get_frozen_deposit ctxt contract cycle
  >>=? fun old_amount ->
  Lwt.return Tez_repr.(old_amount +? amount)
  >>=? fun new_amount ->
  Storage.Contract.Frozen_deposits.init_set (ctxt, contract) cycle new_amount
  >>= fun ctxt ->
  Storage.Delegates_with_frozen_balance.add (ctxt, cycle) delegate
  >>= fun ctxt -> return ctxt

let freeze_deposit ctxt delegate amount =
  let {Level_repr.cycle; _} = Level_storage.current ctxt in
  Roll_storage.Delegate.set_active ctxt delegate
  >>=? fun ctxt ->
  let contract = Contract_repr.implicit_contract delegate in
  Storage.Contract.Balance.get ctxt contract
  >>=? fun balance ->
  Lwt.return
    (record_trace
       (Balance_too_low_for_deposit {delegate; deposit = amount; balance})
       Tez_repr.(balance -? amount))
  >>=? fun new_balance ->
  Storage.Contract.Balance.set ctxt contract new_balance
  >>=? fun ctxt -> credit_frozen_deposit ctxt delegate cycle amount

let get_frozen_fees ctxt contract cycle =
  Storage.Contract.Frozen_fees.get_option (ctxt, contract) cycle
  >>=? function None -> return Tez_repr.zero | Some frozen -> return frozen

let credit_frozen_fees ctxt delegate cycle amount =
  let contract = Contract_repr.implicit_contract delegate in
  get_frozen_fees ctxt contract cycle
  >>=? fun old_amount ->
  Lwt.return Tez_repr.(old_amount +? amount)
  >>=? fun new_amount ->
  Storage.Contract.Frozen_fees.init_set (ctxt, contract) cycle new_amount
  >>= fun ctxt ->
  Storage.Delegates_with_frozen_balance.add (ctxt, cycle) delegate
  >>= fun ctxt -> return ctxt

let freeze_fees ctxt delegate amount =
  let {Level_repr.cycle; _} = Level_storage.current ctxt in
  Roll_storage.Delegate.add_amount ctxt delegate amount
  >>=? fun ctxt -> credit_frozen_fees ctxt delegate cycle amount

let burn_fees ctxt delegate cycle amount =
  let contract = Contract_repr.implicit_contract delegate in
  get_frozen_fees ctxt contract cycle
  >>=? fun old_amount ->
  ( match Tez_repr.(old_amount -? amount) with
  | Ok new_amount ->
      Roll_storage.Delegate.remove_amount ctxt delegate amount
      >>=? fun ctxt -> return (new_amount, ctxt)
  | Error _ ->
      Roll_storage.Delegate.remove_amount ctxt delegate old_amount
      >>=? fun ctxt -> return (Tez_repr.zero, ctxt) )
  >>=? fun (new_amount, ctxt) ->
  Storage.Contract.Frozen_fees.init_set (ctxt, contract) cycle new_amount
  >>= fun ctxt -> return ctxt

let get_frozen_rewards ctxt contract cycle =
  Storage.Contract.Frozen_rewards.get_option (ctxt, contract) cycle
  >>=? function None -> return Tez_repr.zero | Some frozen -> return frozen

let credit_frozen_rewards ctxt delegate cycle amount =
  let contract = Contract_repr.implicit_contract delegate in
  get_frozen_rewards ctxt contract cycle
  >>=? fun old_amount ->
  Lwt.return Tez_repr.(old_amount +? amount)
  >>=? fun new_amount ->
  Storage.Contract.Frozen_rewards.init_set (ctxt, contract) cycle new_amount
  >>= fun ctxt ->
  Storage.Delegates_with_frozen_balance.add (ctxt, cycle) delegate
  >>= fun ctxt -> return ctxt

let freeze_rewards ctxt delegate amount =
  let {Level_repr.cycle; _} = Level_storage.current ctxt in
  credit_frozen_rewards ctxt delegate cycle amount

let burn_rewards ctxt delegate cycle amount =
  let contract = Contract_repr.implicit_contract delegate in
  get_frozen_rewards ctxt contract cycle
  >>=? fun old_amount ->
  let new_amount =
    match Tez_repr.(old_amount -? amount) with
    | Error _ ->
        Tez_repr.zero
    | Ok new_amount ->
        new_amount
  in
  Storage.Contract.Frozen_rewards.init_set (ctxt, contract) cycle new_amount
  >>= fun ctxt -> return ctxt

let unfreeze ctxt delegate cycle =
  let contract = Contract_repr.implicit_contract delegate in
  get_frozen_deposit ctxt contract cycle
  >>=? fun deposit ->
  get_frozen_fees ctxt contract cycle
  >>=? fun fees ->
  get_frozen_rewards ctxt contract cycle
  >>=? fun rewards ->
  Storage.Contract.Balance.get ctxt contract
  >>=? fun balance ->
  Lwt.return Tez_repr.(deposit +? fees)
  >>=? fun unfrozen_amount ->
  Lwt.return Tez_repr.(unfrozen_amount +? rewards)
  >>=? fun unfrozen_amount ->
  Lwt.return Tez_repr.(balance +? unfrozen_amount)
  >>=? fun balance ->
  Storage.Contract.Balance.set ctxt contract balance
  >>=? fun ctxt ->
  Roll_storage.Delegate.add_amount ctxt delegate rewards
  >>=? fun ctxt ->
  Storage.Contract.Frozen_deposits.remove (ctxt, contract) cycle
  >>= fun ctxt ->
  Storage.Contract.Frozen_fees.remove (ctxt, contract) cycle
  >>= fun ctxt ->
  Storage.Contract.Frozen_rewards.remove (ctxt, contract) cycle
  >>= fun ctxt ->
  return
    ( ctxt,
      cleanup_balance_updates
        [ (Deposits (delegate, cycle), Debited deposit);
          (Fees (delegate, cycle), Debited fees);
          (Rewards (delegate, cycle), Debited rewards);
          ( Contract (Contract_repr.implicit_contract delegate),
            Credited unfrozen_amount ) ] )

let cycle_end ctxt last_cycle unrevealed =
  let preserved = Constants_storage.preserved_cycles ctxt in
  ( match Cycle_repr.pred last_cycle with
  | None ->
      return (ctxt, [])
  | Some revealed_cycle ->
      List.fold_left
        (fun acc (u : Nonce_storage.unrevealed) ->
          acc
          >>=? fun (ctxt, balance_updates) ->
          burn_fees ctxt u.delegate revealed_cycle u.fees
          >>=? fun ctxt ->
          burn_rewards ctxt u.delegate revealed_cycle u.rewards
          >>=? fun ctxt ->
          let bus =
            [ (Fees (u.delegate, revealed_cycle), Debited u.fees);
              (Rewards (u.delegate, revealed_cycle), Debited u.rewards) ]
          in
          return (ctxt, bus @ balance_updates))
        (return (ctxt, []))
        unrevealed )
  >>=? fun (ctxt, balance_updates) ->
  match Cycle_repr.sub last_cycle preserved with
  | None ->
      return (ctxt, balance_updates, [])
  | Some unfrozen_cycle ->
      Storage.Delegates_with_frozen_balance.fold
        (ctxt, unfrozen_cycle)
        ~init:(Ok (ctxt, balance_updates))
        ~f:(fun delegate acc ->
          Lwt.return acc
          >>=? fun (ctxt, bus) ->
          unfreeze ctxt delegate unfrozen_cycle
          >>=? fun (ctxt, balance_updates) ->
          return (ctxt, balance_updates @ bus))
      >>=? fun (ctxt, balance_updates) ->
      Storage.Delegates_with_frozen_balance.clear (ctxt, unfrozen_cycle)
      >>= fun ctxt ->
      Storage.Active_delegates_with_rolls.fold
        ctxt
        ~init:(Ok (ctxt, []))
        ~f:(fun delegate acc ->
          Lwt.return acc
          >>=? fun (ctxt, deactivated) ->
          Storage.Contract.Delegate_desactivation.get
            ctxt
            (Contract_repr.implicit_contract delegate)
          >>=? fun cycle ->
          if Cycle_repr.(cycle <= last_cycle) then
            Roll_storage.Delegate.set_inactive ctxt delegate
            >>=? fun ctxt -> return (ctxt, delegate :: deactivated)
          else return (ctxt, deactivated))
      >>=? fun (ctxt, deactivated) ->
      return (ctxt, balance_updates, deactivated)

let punish ctxt delegate cycle =
  let contract = Contract_repr.implicit_contract delegate in
  get_frozen_deposit ctxt contract cycle
  >>=? fun deposit ->
  get_frozen_fees ctxt contract cycle
  >>=? fun fees ->
  get_frozen_rewards ctxt contract cycle
  >>=? fun rewards ->
  Roll_storage.Delegate.remove_amount ctxt delegate deposit
  >>=? fun ctxt ->
  Roll_storage.Delegate.remove_amount ctxt delegate fees
  >>=? fun ctxt ->
  (* Rewards are not accounted in the delegate's rolls yet... *)
  Storage.Contract.Frozen_deposits.remove (ctxt, contract) cycle
  >>= fun ctxt ->
  Storage.Contract.Frozen_fees.remove (ctxt, contract) cycle
  >>= fun ctxt ->
  Storage.Contract.Frozen_rewards.remove (ctxt, contract) cycle
  >>= fun ctxt -> return (ctxt, {deposit; fees; rewards})

let has_frozen_balance ctxt delegate cycle =
  let contract = Contract_repr.implicit_contract delegate in
  get_frozen_deposit ctxt contract cycle
  >>=? fun deposit ->
  if Tez_repr.(deposit <> zero) then return_true
  else
    get_frozen_fees ctxt contract cycle
    >>=? fun fees ->
    if Tez_repr.(fees <> zero) then return_true
    else
      get_frozen_rewards ctxt contract cycle
      >>=? fun rewards -> return Tez_repr.(rewards <> zero)

let frozen_balance_by_cycle_encoding =
  let open Data_encoding in
  conv
    Cycle_repr.Map.bindings
    (List.fold_left
       (fun m (c, b) -> Cycle_repr.Map.add c b m)
       Cycle_repr.Map.empty)
    (list
       (merge_objs
          (obj1 (req "cycle" Cycle_repr.encoding))
          frozen_balance_encoding))

let empty_frozen_balance =
  {deposit = Tez_repr.zero; fees = Tez_repr.zero; rewards = Tez_repr.zero}

let frozen_balance_by_cycle ctxt delegate =
  let contract = Contract_repr.implicit_contract delegate in
  let map = Cycle_repr.Map.empty in
  Storage.Contract.Frozen_deposits.fold
    (ctxt, contract)
    ~init:map
    ~f:(fun cycle amount map ->
      Lwt.return
        (Cycle_repr.Map.add
           cycle
           {empty_frozen_balance with deposit = amount}
           map))
  >>= fun map ->
  Storage.Contract.Frozen_fees.fold
    (ctxt, contract)
    ~init:map
    ~f:(fun cycle amount map ->
      let balance =
        match Cycle_repr.Map.find_opt cycle map with
        | None ->
            empty_frozen_balance
        | Some balance ->
            balance
      in
      Lwt.return (Cycle_repr.Map.add cycle {balance with fees = amount} map))
  >>= fun map ->
  Storage.Contract.Frozen_rewards.fold
    (ctxt, contract)
    ~init:map
    ~f:(fun cycle amount map ->
      let balance =
        match Cycle_repr.Map.find_opt cycle map with
        | None ->
            empty_frozen_balance
        | Some balance ->
            balance
      in
      Lwt.return (Cycle_repr.Map.add cycle {balance with rewards = amount} map))
  >>= fun map -> Lwt.return map

let frozen_balance ctxt delegate =
  let contract = Contract_repr.implicit_contract delegate in
  let balance = Ok Tez_repr.zero in
  Storage.Contract.Frozen_deposits.fold
    (ctxt, contract)
    ~init:balance
    ~f:(fun _cycle amount acc ->
      Lwt.return acc >>=? fun acc -> Lwt.return Tez_repr.(acc +? amount))
  >>= fun balance ->
  Storage.Contract.Frozen_fees.fold
    (ctxt, contract)
    ~init:balance
    ~f:(fun _cycle amount acc ->
      Lwt.return acc >>=? fun acc -> Lwt.return Tez_repr.(acc +? amount))
  >>= fun balance ->
  Storage.Contract.Frozen_rewards.fold
    (ctxt, contract)
    ~init:balance
    ~f:(fun _cycle amount acc ->
      Lwt.return acc >>=? fun acc -> Lwt.return Tez_repr.(acc +? amount))
  >>= fun balance -> Lwt.return balance

let full_balance ctxt delegate =
  let contract = Contract_repr.implicit_contract delegate in
  frozen_balance ctxt delegate
  >>=? fun frozen_balance ->
  Storage.Contract.Balance.get ctxt contract
  >>=? fun balance -> Lwt.return Tez_repr.(frozen_balance +? balance)

let deactivated = Roll_storage.Delegate.is_inactive

let grace_period ctxt delegate =
  let contract = Contract_repr.implicit_contract delegate in
  Storage.Contract.Delegate_desactivation.get ctxt contract

let staking_balance ctxt delegate =
  let token_per_rolls = Constants_storage.tokens_per_roll ctxt in
  Roll_storage.get_rolls ctxt delegate
  >>=? fun rolls ->
  Roll_storage.get_change ctxt delegate
  >>=? fun change ->
  let rolls = Int64.of_int (List.length rolls) in
  Lwt.return Tez_repr.(token_per_rolls *? rolls)
  >>=? fun balance -> Lwt.return Tez_repr.(balance +? change)

let delegated_balance ctxt delegate =
  let contract = Contract_repr.implicit_contract delegate in
  staking_balance ctxt delegate
  >>=? fun staking_balance ->
  Storage.Contract.Balance.get ctxt contract
  >>= fun self_staking_balance ->
  Storage.Contract.Frozen_deposits.fold
    (ctxt, contract)
    ~init:self_staking_balance
    ~f:(fun _cycle amount acc ->
      Lwt.return acc >>=? fun acc -> Lwt.return Tez_repr.(acc +? amount))
  >>= fun self_staking_balance ->
  Storage.Contract.Frozen_fees.fold
    (ctxt, contract)
    ~init:self_staking_balance
    ~f:(fun _cycle amount acc ->
      Lwt.return acc >>=? fun acc -> Lwt.return Tez_repr.(acc +? amount))
  >>=? fun self_staking_balance ->
  Lwt.return Tez_repr.(staking_balance -? self_staking_balance)

let fold = Storage.Delegates.fold

let list = Storage.Delegates.elements