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|
open Core
type account_type = Asset | Equity | Liability | Expense | Income
type tx_type =
| Interest_tx
| Online_banking_tx
| Recurrent_direct_tx
| Payment_terminal_tx
| Cash_payment_tx
| Atm_tx
| Auto_save_rounding_tx
| Batch_tx
| Direct_debit_tx
| Periodic_tx
type iban_tag = Account_tag | Counterparty_iban_tag
[@@deriving compare, sexp_of]
type unit_tag = Filed_tag | Google_pay_tag | Auto_round_savings_tag
[@@deriving compare, sexp_of]
type string_tag =
| Desc_tag
| User_tag
| Counterparty_name_tag
| Reference_tag
| Mandate_id_tag
| Creditor_id_tag
| Other_party_tag
| Transaction_tag
| Terminal_tag
| Card_seq_no_tag
| Savings_account_tag
[@@deriving compare, sexp_of]
module Label = struct
type 'a t =
| Iban_label : iban_tag -> Iban.t t
| String_label : string_tag -> string t
| Timestamp_label : Time_ns.t t
| Unit_label : unit_tag -> unit t
let int_to_cmp x : ('a, 'a) Dmap.cmp =
if x < 0 then Lt else if x > 0 then Gt else Eq
let compare (type a1 a2) (v1 : a1 t) (v2 : a2 t) : (a1, a2) Dmap.cmp =
match (v1, v2) with
| Iban_label t1, Iban_label t2 -> int_to_cmp @@ [%compare: iban_tag] t1 t2
| String_label t1, String_label t2 ->
int_to_cmp @@ [%compare: string_tag] t1 t2
| Timestamp_label, Timestamp_label -> Eq
| Unit_label t1, Unit_label t2 -> int_to_cmp @@ [%compare: unit_tag] t1 t2
| Iban_label _, _ -> Lt
| String_label _, Iban_label _ -> Gt
| String_label _, _ -> Lt
| Timestamp_label, Unit_label _ -> Lt
| Timestamp_label, _ -> Gt
| Unit_label _, _ -> Gt
end
module Labels = struct
include Dmap.Make (Label)
let sexp_of_t m =
Sexp.List
(bindings m
|> List.map ~f:(function
| Binding (Iban_label tag, iban) ->
Sexp.List
[
Sexp.Atom "Iban_label";
[%sexp_of: iban_tag] tag;
[%sexp_of: Iban.t] iban;
]
| Binding (String_label tag, s) ->
Sexp.List
[
Sexp.Atom "String_label";
[%sexp_of: string_tag] tag;
Sexp.Atom s;
]
| Binding (Timestamp_label, ts) ->
Sexp.List
[ Sexp.Atom "Timestamp_label"; [%sexp_of: Time_ns_unix.t] ts ]
| Binding (Unit_label tag, ()) ->
Sexp.List [ Sexp.Atom "Unit_label"; [%sexp_of: unit_tag] tag ]))
end
module Z = struct
include Z
let sexp_of_t x = Sexp.Atom (Z.to_string x)
end
module Money : sig
type t
val equal : t -> t -> bool
val compare : t -> t -> int
val of_z : Z.t -> t
val to_z : t -> Z.t
val ( + ) : t -> t -> t
val ( - ) : t -> t -> t
val sexp_of_t : t -> Sexp.t
end = struct
type t = Z.t [@@deriving sexp_of]
let equal = Z.equal
let compare = Z.compare
let of_z = Fn.id
let to_z = Fn.id
let ( + ) x y = Z.(x + y)
let ( - ) x y = Z.(x - y)
end
type scalar = Amount of Money.t | Rate of Z.t
[@@deriving equal, compare, sexp_of]
type commodity_id = string
(* TODO: consider making this UUID *) [@@deriving sexp]
module Account_id = struct
type t = string list [@@deriving sexp, compare]
end
type account = {
id : Account_id.t;
description : string list;
commodity_id : commodity_id;
balance : Money.t;
}
[@@deriving sexp_of]
type bal_assert = {
account : Account_id.t;
amount : Money.t;
labels : Labels.t;
}
[@@deriving sexp_of]
module Account_id_map = Map.Make (Account_id)
module Tx : sig
type t
type error = Unbalanced
val make :
cleared:Date.t option ->
commodity_id:commodity_id ->
debit:scalar Account_id_map.t ->
credit:scalar Account_id_map.t ->
labels:Labels.t ->
(t, error) result
val cleared : t -> Date.t option
val commodity_id : t -> commodity_id
val debit : t -> scalar Account_id_map.t
val credit : t -> scalar Account_id_map.t
val labels : t -> Labels.t
val sexp_of_t : t -> Sexp.t
end = struct
(* We hide this because we only want to allow constructing balanced transactions *)
type t = {
cleared : Date.t option;
commodity_id : commodity_id;
debit : scalar Account_id_map.t;
credit : scalar Account_id_map.t;
labels : Labels.t;
}
[@@deriving fields, sexp_of]
type error = Unbalanced
(* TODO: check if debits and credits are balanced *)
let is_balanced _debits _credits = true
let make ~cleared ~commodity_id ~debit ~credit ~labels =
if not (is_balanced debit credit) then Error Unbalanced
else Ok { cleared; commodity_id; debit; credit; labels }
end
type item = Tx_item of Tx.t | Bal_assert_item of bal_assert
[@@deriving sexp_of]
type t = item list [@@deriving sexp_of]
|
