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(* Open Source License                                                       *)
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(* Copyright (c) 2022 Trili Tech, <contact@trili.tech>                       *)
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open Sc_rollup_repr

module Hash = struct
  include Smart_rollup.Commitment_hash
  include Path_encoding.Make_hex (Smart_rollup.Commitment_hash)
end

module V1 = struct
  type t = {
    compressed_state : State_hash.t;
    inbox_level : Raw_level_repr.t;
    predecessor : Hash.t;
    number_of_ticks : Number_of_ticks.t;
  }

  let pp fmt {compressed_state; inbox_level; predecessor; number_of_ticks} =
    Format.fprintf
      fmt
      "compressed_state: %a@,\
       inbox_level: %a@,\
       predecessor: %a@,\
       number_of_ticks: %Ld"
      State_hash.pp
      compressed_state
      Raw_level_repr.pp
      inbox_level
      Hash.pp
      predecessor
      (Number_of_ticks.to_value number_of_ticks)

  let encoding =
    let open Data_encoding in
    conv
      (fun {compressed_state; inbox_level; predecessor; number_of_ticks} ->
        (compressed_state, inbox_level, predecessor, number_of_ticks))
      (fun (compressed_state, inbox_level, predecessor, number_of_ticks) ->
        {compressed_state; inbox_level; predecessor; number_of_ticks})
      (obj4
         (req "compressed_state" State_hash.encoding)
         (req "inbox_level" Raw_level_repr.encoding)
         (req "predecessor" Hash.encoding)
         (req "number_of_ticks" Number_of_ticks.encoding))

  let hash_uncarbonated commitment =
    let commitment_bytes =
      Data_encoding.Binary.to_bytes_exn encoding commitment
    in
    Hash.hash_bytes [commitment_bytes]

  (* For [number_of_messages] and [number_of_ticks] min_value is equal to zero. *)
  let genesis_commitment ~origination_level ~genesis_state_hash =
    let open Sc_rollup_repr in
    let number_of_ticks = Number_of_ticks.zero in
    {
      compressed_state = genesis_state_hash;
      inbox_level = origination_level;
      predecessor = Hash.zero;
      number_of_ticks;
    }

  type genesis_info = {level : Raw_level_repr.t; commitment_hash : Hash.t}

  let genesis_info_encoding =
    let open Data_encoding in
    conv
      (fun {level; commitment_hash} -> (level, commitment_hash))
      (fun (level, commitment_hash) -> {level; commitment_hash})
      (obj2
         (req "level" Raw_level_repr.encoding)
         (req "commitment_hash" Hash.encoding))
end

type versioned = V1 of V1.t

let versioned_encoding =
  let open Data_encoding in
  union
    [
      case
        ~title:"V1"
        (Tag 0)
        V1.encoding
        (function V1 commitment -> Some commitment)
        (fun commitment -> V1 commitment);
    ]

include V1

let of_versioned = function V1 commitment -> commitment [@@inline]

let to_versioned commitment = V1 commitment [@@inline]