(*****************************************************************************)
(*                                                                           *)
(* 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.                                                 *)
(*                                                                           *)
(*****************************************************************************)

open Storage_functors

module Int = struct
  type t = int
  let encoding = Data_encoding.uint16
end

module Int32 = struct
  type t = Int32.t
  let encoding = Data_encoding.int32
end

module Z = struct
  type t = Z.t
  let encoding = Data_encoding.z
end

module Int_index = struct
  type t = int
  let path_length = 1
  let to_path c l = string_of_int c :: l
  let of_path = function
    | [] | _ :: _ :: _ -> None
    | [ c ] -> int_of_string_opt c
  type 'a ipath = 'a * t
  let args = Storage_description.One {
      rpc_arg = RPC_arg.int ;
      encoding = Data_encoding.int31 ;
      compare = Compare.Int.compare ;
    }
end

module Make_index(H : Storage_description.INDEX)
  : INDEX with type t = H.t and type 'a ipath = 'a * H.t = struct
  include H
  type 'a ipath = 'a * t
  let args = Storage_description.One {
      rpc_arg ;
      encoding ;
      compare ;
    }
end

module Last_block_priority =
  Make_single_data_storage
    (Raw_context)
    (struct let name = ["last_block_priority"] end)
    (Int)

(** Contracts handling *)

module Contract = struct

  module Raw_context =
    Make_subcontext(Raw_context)(struct let name = ["contracts"] end)

  module Global_counter =
    Make_single_data_storage
      (Raw_context)
      (struct let name = ["global_counter"] end)
      (Z)

  module Indexed_context =
    Make_indexed_subcontext
      (Make_subcontext(Raw_context)(struct let name = ["index"] end))
      (Make_index(Contract_repr.Index))

  let fold = Indexed_context.fold_keys
  let list = Indexed_context.keys

  module Balance =
    Indexed_context.Make_map
      (struct let name = ["balance"] end)
      (Tez_repr)

  module Frozen_balance_index =
    Make_indexed_subcontext
      (Make_subcontext
         (Indexed_context.Raw_context)
         (struct let name = ["frozen_balance"] end))
      (Make_index(Cycle_repr.Index))

  module Frozen_deposits =
    Frozen_balance_index.Make_map
      (struct let name = ["deposits"] end)
      (Tez_repr)

  module Frozen_fees =
    Frozen_balance_index.Make_map
      (struct let name = ["fees"] end)
      (Tez_repr)

  module Frozen_rewards =
    Frozen_balance_index.Make_map
      (struct let name = ["rewards"] end)
      (Tez_repr)

  module Manager =
    Indexed_context.Make_map
      (struct let name = ["manager"] end)
      (Manager_repr)

  module Spendable =
    Indexed_context.Make_set
      (struct let name = ["spendable"] end)

  module Delegatable =
    Indexed_context.Make_set
      (struct let name = ["delegatable"] end)

  module Delegate =
    Indexed_context.Make_map
      (struct let name = ["delegate"] end)
      (Signature.Public_key_hash)

  module Inactive_delegate =
    Indexed_context.Make_set
      (struct let name = ["inactive_delegate"] end)

  module Delegate_desactivation =
    Indexed_context.Make_map
      (struct let name = ["delegate_desactivation"] end)
      (Cycle_repr)

  module Delegated =
    Make_data_set_storage
      (Make_subcontext
         (Indexed_context.Raw_context)
         (struct let name = ["delegated"] end))
      (Make_index(Contract_hash))

  module Counter =
    Indexed_context.Make_map
      (struct let name = ["counter"] end)
      (Z)

  (* Consume gas for serilization and deserialization of expr in this
     module *)
  module Make_carbonated_map_expr (N : Storage_sigs.NAME) = struct
    module I = Indexed_context.Make_carbonated_map
        (N)
        (struct
          type t = Script_repr.lazy_expr
          let encoding = Script_repr.lazy_expr_encoding
        end)

    type context = I.context
    type key = I.key
    type value = I.value

    let mem = I.mem
    let delete = I.delete
    let remove = I.remove

    let consume_deserialize_gas ctxt value =
      Lwt.return @@
      (Raw_context.check_enough_gas ctxt (Script_repr.minimal_deserialize_cost value) >>? fun () ->
       Script_repr.force_decode value >>? fun (_value, value_cost) ->
       Raw_context.consume_gas ctxt value_cost)

    let consume_serialize_gas ctxt value =
      Lwt.return @@
      (Script_repr.force_bytes value >>? fun (_value, value_cost) ->
       Raw_context.consume_gas ctxt value_cost)

    let get ctxt contract =
      I.get ctxt contract >>=? fun (ctxt, value) ->
      consume_deserialize_gas ctxt value >>|? fun ctxt ->
      (ctxt, value)

    let get_option ctxt contract =
      I.get_option ctxt contract >>=? fun (ctxt, value_opt) ->
      match value_opt with
      | None -> return (ctxt, None)
      | Some value ->
          consume_deserialize_gas ctxt value >>|? fun ctxt ->
          (ctxt, value_opt)

    let set ctxt contract value =
      consume_serialize_gas ctxt value >>=? fun ctxt ->
      I.set ctxt contract value

    let set_option ctxt contract value_opt =
      match value_opt with
      | None -> I.set_option ctxt contract None
      | Some value ->
          consume_serialize_gas ctxt value >>=? fun ctxt ->
          I.set_option ctxt contract value_opt

    let init ctxt contract value =
      consume_serialize_gas ctxt value >>=? fun ctxt ->
      I.init ctxt contract value

    let init_set ctxt contract value =
      consume_serialize_gas ctxt value >>=? fun ctxt ->
      I.init_set ctxt contract value
  end

  module Code =
    Make_carbonated_map_expr
      (struct let name = ["code"] end)

  module Storage =
    Make_carbonated_map_expr
      (struct let name = ["storage"] end)

  type bigmap_key = Raw_context.t * Contract_repr.t

  (* Consume gas for serilization and deserialization of expr in this
     module *)
  module Big_map = struct
    module I = Storage_functors.Make_indexed_carbonated_data_storage
        (Make_subcontext
           (Indexed_context.Raw_context)
           (struct let name = ["big_map"] end))
        (Make_index(Script_expr_hash))
        (struct
          type t = Script_repr.expr
          let encoding = Script_repr.expr_encoding
        end)

    type context = I.context
    type key = I.key
    type value = I.value

    let mem = I.mem
    let delete = I.delete
    let remove = I.remove
    let set = I.set
    let set_option = I.set_option
    let init = I.init
    let init_set = I.init_set

    let consume_deserialize_gas ctxt value =
      Lwt.return @@
      Raw_context.consume_gas ctxt (Script_repr.deserialized_cost value)

    let get ctxt contract =
      I.get ctxt contract >>=? fun (ctxt, value) ->
      consume_deserialize_gas ctxt value >>|? fun ctxt ->
      (ctxt, value)

    let get_option ctxt contract =
      I.get_option ctxt contract >>=? fun (ctxt, value_opt) ->
      match value_opt with
      | None -> return (ctxt, None)
      | Some value ->
          consume_deserialize_gas ctxt value >>|? fun ctxt ->
          (ctxt, value_opt)
  end

  module Paid_storage_space =
    Indexed_context.Make_map
      (struct let name = ["paid_bytes"] end)
      (Z)

  module Used_storage_space =
    Indexed_context.Make_map
      (struct let name = ["used_bytes"] end)
      (Z)

  module Roll_list =
    Indexed_context.Make_map
      (struct let name = ["roll_list"] end)
      (Roll_repr)

  module Change =
    Indexed_context.Make_map
      (struct let name = ["change"] end)
      (Tez_repr)

end

module Delegates =
  Make_data_set_storage
    (Make_subcontext(Raw_context)(struct let name = ["delegates"] end))
    (Make_index(Signature.Public_key_hash))

module Active_delegates_with_rolls =
  Make_data_set_storage
    (Make_subcontext(Raw_context)(struct let name = ["active_delegates_with_rolls"] end))
    (Make_index(Signature.Public_key_hash))

module Delegates_with_frozen_balance_index =
  Make_indexed_subcontext
    (Make_subcontext(Raw_context)
       (struct let name = ["delegates_with_frozen_balance"] end))
    (Make_index(Cycle_repr.Index))

module Delegates_with_frozen_balance =
  Make_data_set_storage
    (Delegates_with_frozen_balance_index.Raw_context)
    (Make_index(Signature.Public_key_hash))

(** Rolls *)

module Cycle = struct

  module Indexed_context =
    Make_indexed_subcontext
      (Make_subcontext(Raw_context)(struct let name = ["cycle"] end))
      (Make_index(Cycle_repr.Index))

  module Last_roll =
    Make_indexed_data_storage
      (Make_subcontext
         (Indexed_context.Raw_context)
         (struct let name = ["last_roll"] end))
      (Int_index)
      (Roll_repr)

  module Roll_snapshot =
    Indexed_context.Make_map
      (struct let name = ["roll_snapshot"] end)
      (Int)

  type unrevealed_nonce = {
    nonce_hash: Nonce_hash.t ;
    delegate: Signature.Public_key_hash.t ;
    rewards: Tez_repr.t ;
    fees: Tez_repr.t ;
  }

  type nonce_status =
    | Unrevealed of unrevealed_nonce
    | Revealed of Seed_repr.nonce

  let nonce_status_encoding =
    let open Data_encoding in
    union [
      case (Tag 0)
        ~title:"Unrevealed"
        (tup4
           Nonce_hash.encoding
           Signature.Public_key_hash.encoding
           Tez_repr.encoding
           Tez_repr.encoding)
        (function
          | Unrevealed { nonce_hash ; delegate ; rewards ; fees } ->
              Some (nonce_hash, delegate, rewards, fees)
          | _ -> None)
        (fun (nonce_hash, delegate, rewards, fees) ->
           Unrevealed { nonce_hash ; delegate ; rewards ; fees }) ;
      case (Tag 1)
        ~title:"Revealed"
        Seed_repr.nonce_encoding
        (function
          | Revealed nonce -> Some nonce
          | _ -> None)
        (fun nonce -> Revealed nonce)
    ]

  module Nonce =
    Make_indexed_data_storage
      (Make_subcontext
         (Indexed_context.Raw_context)
         (struct let name = ["nonces"] end))
      (Make_index(Raw_level_repr.Index))
      (struct
        type t = nonce_status
        let encoding = nonce_status_encoding
      end)

  module Seed =
    Indexed_context.Make_map
      (struct let name = ["random_seed"] end)
      (struct
        type t = Seed_repr.seed
        let encoding = Seed_repr.seed_encoding
      end)

end

module Roll = struct

  module Raw_context =
    Make_subcontext(Raw_context)(struct let name = ["rolls"] end)

  module Indexed_context =
    Make_indexed_subcontext
      (Make_subcontext(Raw_context)(struct let name = ["index"] end))
      (Make_index(Roll_repr.Index))

  module Next =
    Make_single_data_storage
      (Raw_context)
      (struct let name = ["next"] end)
      (Roll_repr)

  module Limbo =
    Make_single_data_storage
      (Raw_context)
      (struct let name = ["limbo"] end)
      (Roll_repr)

  module Delegate_roll_list =
    Wrap_indexed_data_storage(Contract.Roll_list)(struct
      type t = Signature.Public_key_hash.t
      let wrap = Contract_repr.implicit_contract
      let unwrap = Contract_repr.is_implicit
    end)

  module Successor =
    Indexed_context.Make_map
      (struct let name = ["successor"] end)
      (Roll_repr)

  module Delegate_change =
    Wrap_indexed_data_storage(Contract.Change)(struct
      type t = Signature.Public_key_hash.t
      let wrap = Contract_repr.implicit_contract
      let unwrap = Contract_repr.is_implicit
    end)

  module Snapshoted_owner_index = struct
    type t = Cycle_repr.t * int
    let path_length = Cycle_repr.Index.path_length + 1
    let to_path (c, n) s =
      Cycle_repr.Index.to_path c (string_of_int n :: s)
    let of_path l =
      match Misc.take Cycle_repr.Index.path_length l with
      | None | Some (_, ([] | _ :: _ :: _ ))-> None
      | Some (l1, [l2]) ->
          match Cycle_repr.Index.of_path l1, int_of_string_opt l2 with
          | None, _ | _, None -> None
          | Some c, Some i -> Some (c, i)

    type 'a ipath = ('a * Cycle_repr.t) * int
    let left_args =
      Storage_description.One {
        rpc_arg = Cycle_repr.rpc_arg ;
        encoding = Cycle_repr.encoding ;
        compare = Cycle_repr.compare
      }
    let right_args =
      Storage_description.One {
        rpc_arg = RPC_arg.int ;
        encoding = Data_encoding.int31 ;
        compare = Compare.Int.compare ;
      }
    let args =
      Storage_description.(Pair (left_args, right_args))
  end

  module Owner =
    Make_indexed_data_snapshotable_storage
      (Make_subcontext(Raw_context)(struct let name = ["owner"] end))
      (Snapshoted_owner_index)
      (Make_index(Roll_repr.Index))
      (Signature.Public_key)

  module Snapshot_for_cycle = Cycle.Roll_snapshot
  module Last_for_snapshot = Cycle.Last_roll

  let clear = Indexed_context.clear

end

(** Votes **)

module Vote = struct

  module Raw_context =
    Make_subcontext(Raw_context)(struct let name = ["votes"] end)

  module Current_period_kind =
    Make_single_data_storage
      (Raw_context)
      (struct let name = ["current_period_kind"] end)
      (struct
        type t = Voting_period_repr.kind
        let encoding = Voting_period_repr.kind_encoding
      end)

  module Current_quorum =
    Make_single_data_storage
      (Raw_context)
      (struct let name = ["current_quorum"] end)
      (Int32)

  module Current_proposal =
    Make_single_data_storage
      (Raw_context)
      (struct let name = ["current_proposal"] end)
      (Protocol_hash)

  module Listings_size =
    Make_single_data_storage
      (Raw_context)
      (struct let name = ["listings_size"] end)
      (Int32)

  module Listings =
    Make_indexed_data_storage
      (Make_subcontext(Raw_context)(struct let name = ["listings"] end))
      (Make_index(Signature.Public_key_hash))
      (Int32)

  module Proposals =
    Make_data_set_storage
      (Make_subcontext(Raw_context)(struct let name = ["proposals"] end))
      (Pair(Make_index(Protocol_hash))(Make_index(Signature.Public_key_hash)))

  module Proposals_count =
    Make_indexed_data_storage
      (Make_subcontext(Raw_context)
         (struct let name = ["proposals_count"] end))
      (Make_index(Signature.Public_key_hash))
      (Int)

  module Ballots =
    Make_indexed_data_storage
      (Make_subcontext(Raw_context)(struct let name = ["ballots"] end))
      (Make_index(Signature.Public_key_hash))
      (struct
        type t = Vote_repr.ballot
        let encoding = Vote_repr.ballot_encoding
      end)

end

(** Seed *)

module Seed = struct

  type unrevealed_nonce = Cycle.unrevealed_nonce = {
    nonce_hash: Nonce_hash.t ;
    delegate: Signature.Public_key_hash.t ;
    rewards: Tez_repr.t ;
    fees: Tez_repr.t ;
  }

  type nonce_status = Cycle.nonce_status =
    | Unrevealed of unrevealed_nonce
    | Revealed of Seed_repr.nonce

  module Nonce = struct
    open Level_repr
    type context = Raw_context.t
    let mem ctxt l = Cycle.Nonce.mem (ctxt, l.cycle) l.level
    let get ctxt l = Cycle.Nonce.get (ctxt, l.cycle) l.level
    let get_option ctxt l = Cycle.Nonce.get_option (ctxt, l.cycle) l.level
    let set ctxt l v = Cycle.Nonce.set (ctxt, l.cycle) l.level v
    let init ctxt l v = Cycle.Nonce.init (ctxt, l.cycle) l.level v
    let init_set ctxt l v = Cycle.Nonce.init_set (ctxt, l.cycle) l.level v
    let set_option ctxt l v = Cycle.Nonce.set_option (ctxt, l.cycle) l.level v
    let delete ctxt l = Cycle.Nonce.delete (ctxt, l.cycle) l.level
    let remove ctxt l = Cycle.Nonce.remove (ctxt, l.cycle) l.level
  end
  module For_cycle = Cycle.Seed

end

(** Commitments *)

module Commitments =
  Make_indexed_data_storage
    (Make_subcontext(Raw_context)(struct let name = ["commitments"] end))
    (Make_index(Blinded_public_key_hash.Index))
    (Tez_repr)

(** Ramp up security deposits... *)

module Ramp_up = struct

  module Rewards =
    Make_indexed_data_storage
      (Make_subcontext(Raw_context)(struct let name = ["ramp_up"; "rewards"] end))
      (Make_index(Cycle_repr.Index))
      (struct
        type t = Tez_repr.t * Tez_repr.t
        let encoding = Data_encoding.tup2 Tez_repr.encoding Tez_repr.encoding
      end)

  module Security_deposits =
    Make_indexed_data_storage
      (Make_subcontext(Raw_context)(struct let name = ["ramp_up"; "deposits"] end))
      (Make_index(Cycle_repr.Index))
      (struct
        type t = Tez_repr.t * Tez_repr.t
        let encoding = Data_encoding.tup2 Tez_repr.encoding Tez_repr.encoding
      end)

end