From 46169ec3eb38e177cafd7faf6338d36c6a9e3971 Mon Sep 17 00:00:00 2001
From: Rutger Broekhoff
Date: Thu, 27 Nov 2025 23:35:08 +0100
Subject: Whatever all of this is

---
 lib/ledger.mli | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 lib/ledger.mli

(limited to 'lib/ledger.mli')

diff --git a/lib/ledger.mli b/lib/ledger.mli
new file mode 100644
index 0000000..0b8e383
--- /dev/null
+++ b/lib/ledger.mli
@@ -0,0 +1,133 @@
+open Prelude
+
+(*
+type account_type = Asset | Equity | Liability | Expense | Income
+[@@deriving compare, sexp]*)
+
+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]
+
+type unit_tag = Filed_tag | Google_pay_tag | Auto_round_savings_tag
+[@@deriving compare, sexp]
+
+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]
+
+module Label : sig
+  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
+
+  val int_to_cmp : int -> ('a, 'a) Dmap.cmp
+  val compare : 'a1 'a2. 'a1 t -> 'a2 t -> ('a1, 'a2) Dmap.cmp
+end
+
+module Labels : sig
+  include Dmap.S with type 'a key = 'a Label.t
+
+  val sexp_of_binding : binding -> Sexp.t
+  val binding_of_sexp : Sexp.t -> binding
+
+  include Sexpable.S with type t := t
+end
+
+module Money : sig
+  type t
+
+  val equal : t -> t -> bool
+  val compare : t -> t -> int
+  val of_bigint : Bigint.t -> t
+  val to_bigint : t -> Bigint.t
+  val ( + ) : t -> t -> t
+  val ( - ) : t -> t -> t
+  val ( = ) : t -> t -> bool
+  val ( ~$ ) : int -> t
+  val sexp_of_t : t -> Sexp.t
+end
+
+type commodity_id = string
+(* TODO: consider making this UUID *) [@@deriving equal, compare, sexp]
+
+type scalar =
+  | Amount of Money.t
+  | Rate of { in_primary_commodity : Money.t; rate : Bigdecimal.t }
+[@@deriving equal, compare, sexp_of]
+
+module Account_id : sig
+  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.S with type Key.t = Account_id.t
+
+module Debit_credit : sig
+  type t = Debit | Credit [@@deriving string, sexp_of]
+
+  val opposite : t -> t
+end
+
+module Tx : sig
+  (* Private because we only want to allow constructing balanced transactions. *)
+  type t = private {
+    cleared : Date.t option;
+    commodity_id : commodity_id;
+    entries : (Debit_credit.t * scalar * Money.t option) Account_id_map.t;
+    labels : Labels.t;
+  }
+
+  type error = Unbalanced
+
+  val make :
+    cleared:Date.t option ->
+    commodity_id:commodity_id ->
+    entries:(Debit_credit.t * scalar * Money.t option) Account_id_map.t ->
+    labels:Labels.t ->
+    (t, error) result
+
+  val sexp_of_t : t -> Sexp.t
+end
+
+type item = Tx_item of Tx.t | Bal_assert_item of bal_assert
+[@@deriving sexp_of]
+
+type t [@@deriving sexp_of]
+
+val make : item list -> t
-- 
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