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(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
(* Copyright (c) 2019-2020 Nomadic Labs <contact@nomadic-labs.com>           *)
(* Copyright (c) 2021 DaiLambda, Inc. <contact@dailambda.jp>                 *)
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(*
  To add invoices, you can use a helper function like this one:

(** Invoice a contract at a given address with a given amount. Returns the
    updated context and a  balance update receipt (singleton list). The address
    must be a valid base58 hash, otherwise this is no-op and returns an empty
    receipts list.

    Do not fail if something goes wrong.
*)

let invoice_contract ctxt ~address ~amount_mutez =
  match Tez_repr.of_mutez amount_mutez with
  | None -> Lwt.return (ctxt, [])
  | Some amount -> (
      ( Contract_repr.of_b58check address >>?= fun recipient ->
        Token.transfer
          ~origin:Protocol_migration
          ctxt
          `Invoice
          (`Contract recipient)
          amount )
      >|= function
      | Ok res -> res
      | Error _ -> (ctxt, []))
*)

(*
  To patch code of legacy contracts you can add a helper function here and call
  it at the end of prepare_first_block.

  See !3730 for an example.
*)

let patch_script (address, hash, patched_code) ctxt =
  Contract_repr.of_b58check address >>?= fun contract ->
  Storage.Contract.Code.find ctxt contract >>=? fun (ctxt, code_opt) ->
  Logging.log Notice "Patching %s... " address ;
  match code_opt with
  | Some old_code ->
      let old_bin = Data_encoding.force_bytes old_code in
      let old_hash = Script_expr_hash.hash_bytes [old_bin] in
      if Script_expr_hash.equal old_hash hash then (
        let new_code = Script_repr.lazy_expr patched_code in
        Storage.Contract.Code.update ctxt contract new_code
        >>=? fun (ctxt, size_diff) ->
        Logging.log Notice "Contract %s successfully patched" address ;
        let size_diff = Z.of_int size_diff in
        Storage.Contract.Used_storage_space.get ctxt contract
        >>=? fun prev_size ->
        let new_size = Z.add prev_size size_diff in
        Storage.Contract.Used_storage_space.update ctxt contract new_size
        >>=? fun ctxt ->
        if Z.(gt size_diff zero) then
          Storage.Contract.Paid_storage_space.get ctxt contract
          >>=? fun prev_paid_size ->
          let paid_size = Z.add prev_paid_size size_diff in
          Storage.Contract.Paid_storage_space.update ctxt contract paid_size
        else return ctxt)
      else (
        Logging.log
          Error
          "Patching %s was skipped because its script does not have the \
           expected hash (expected: %a, found: %a)"
          address
          Script_expr_hash.pp
          hash
          Script_expr_hash.pp
          old_hash ;
        return ctxt)
  | None ->
      Logging.log
        Error
        "Patching %s was skipped because no script was found for it in the \
         context."
        address ;
      return ctxt

let prepare_first_block _chain_id ctxt ~typecheck ~level ~timestamp =
  Raw_context.prepare_first_block ~level ~timestamp ctxt
  >>=? fun (previous_protocol, ctxt) ->
  let parametric = Raw_context.constants ctxt in
  ( Raw_context.Cache.set_cache_layout
      ctxt
      (Constants_repr.cache_layout parametric)
  >|= fun ctxt -> Raw_context.Cache.clear ctxt )
  >>= fun ctxt ->
  (match previous_protocol with
  | Genesis param ->
      (* This is the genesis protocol: initialise the state *)
      Raw_level_repr.of_int32 level >>?= fun level ->
      Storage.Tenderbake.First_level_of_protocol.init ctxt level
      >>=? fun ctxt ->
      Storage.Block_round.init ctxt Round_repr.zero >>=? fun ctxt ->
      let init_commitment (ctxt, balance_updates)
          Commitment_repr.{blinded_public_key_hash; amount} =
        Token.transfer
          ctxt
          `Initial_commitments
          (`Collected_commitments blinded_public_key_hash)
          amount
        >>=? fun (ctxt, new_balance_updates) ->
        return (ctxt, new_balance_updates @ balance_updates)
      in
      List.fold_left_es init_commitment (ctxt, []) param.commitments
      >>=? fun (ctxt, commitments_balance_updates) ->
      Storage.Stake.Last_snapshot.init ctxt 0 >>=? fun ctxt ->
      Seed_storage.init ?initial_seed:param.constants.initial_seed ctxt
      >>=? fun ctxt ->
      Contract_storage.init ctxt >>=? fun ctxt ->
      Bootstrap_storage.init
        ctxt
        ~typecheck
        ?no_reward_cycles:param.no_reward_cycles
        param.bootstrap_accounts
        param.bootstrap_contracts
      >>=? fun (ctxt, bootstrap_balance_updates) ->
      Delegate_cycles.init_first_cycles ctxt ~origin:Protocol_migration
      >>=? fun (ctxt, deposits_balance_updates) ->
      Vote_storage.init
        ctxt
        ~start_position:(Level_storage.current ctxt).level_position
      >>=? fun ctxt ->
      Vote_storage.update_listings ctxt >>=? fun ctxt ->
      (* Must be called after other originations since it unsets the origination nonce. *)
      Liquidity_baking_migration.init ctxt ~typecheck
      >>=? fun (ctxt, operation_results) ->
      Storage.Pending_migration.Operation_results.init ctxt operation_results
      >>=? fun ctxt ->
      Sc_rollup_inbox_storage.init ctxt >>=? fun ctxt ->
      return
        ( ctxt,
          commitments_balance_updates @ bootstrap_balance_updates
          @ deposits_balance_updates )
  | Lima_015
  (* Please update [next_protocol] and [previous_protocol] in
     [tezt/lib_tezos/protocol.ml] when you update this value. *) ->
      (* TODO (#2704): possibly handle endorsements for migration block (in bakers);
         if that is done, do not set Storage.Tenderbake.First_level_of_protocol. *)
      Raw_level_repr.of_int32 level >>?= fun level ->
      Storage.Tenderbake.First_level_of_protocol.update ctxt level
      >>=? fun ctxt ->
      Sc_rollup_inbox_storage.init ctxt >>=? fun ctxt -> return (ctxt, []))
  >>=? fun (ctxt, balance_updates) ->
  List.fold_right_es patch_script Legacy_script_patches.addresses_to_patch ctxt
  >>=? fun ctxt ->
  Receipt_repr.group_balance_updates balance_updates >>?= fun balance_updates ->
  Storage.Pending_migration.Balance_updates.add ctxt balance_updates
  >>= fun ctxt -> return ctxt

let prepare ctxt ~level ~predecessor_timestamp ~timestamp =
  Raw_context.prepare ~level ~predecessor_timestamp ~timestamp ctxt
  >>=? fun ctxt -> Storage.Pending_migration.remove ctxt