let solde ?(mvt_predicate = Mvt.any) ~at:(y, m, d) mvts =
  mvts
  |> List.filter (Mvt.until y m d)
  |> List.filter mvt_predicate
  |> List.rev_map (fun m -> m.Mvt.amount)
  |> List.fold_left ( +. ) 0.

let balance ?(mvt_predicate = Mvt.any) ~from ~until mvts =
  solde ~mvt_predicate ~at:until mvts -. solde ~mvt_predicate ~at:from mvts

let bilan ?(mvt_predicate = Mvt.any) ~from:(fy, fm, fd) ~until:(uy, um, ud) mvts
    () =
  let t = Hashtbl.create 164 in
  mvts
  |> List.filter (Mvt.after fy fm fd)
  |> List.filter (Mvt.until uy um ud)
  |> List.filter mvt_predicate
  |> List.iter (fun mvt ->
         let i = mvt.Mvt.category ^ ":" ^ mvt.Mvt.subcategory in
         match Hashtbl.find_opt t i with
         | None -> Hashtbl.add t i mvt.amount
         | Some a -> Hashtbl.replace t i (mvt.amount +. a));

  Hashtbl.iter
    (fun cat mont -> if mont < 0. then Printf.printf "%50s\t%04.02f\n" cat mont)
    t;

  Hashtbl.iter
    (fun cat mont ->
      if mont >= 0. then Printf.printf "%50s\t%04.02f\n" cat mont)
    t

let main ~from:((yf, mf, df) as from) ~until:((yu, mu, du) as until) () =
  let ops =
    Mvt.mvts "/home/matt/Téléchargements/MAI2021.mmb_update_2021-05-06.mmb"
  in

  let caisse_dbt = solde ~mvt_predicate:Mvt.is_account_caisse ~at:from ops
  and caisse_fin = solde ~mvt_predicate:Mvt.is_account_caisse ~at:until ops
  and courant_dbt = solde ~mvt_predicate:Mvt.is_account_courant ~at:from ops
  and courant_fin = solde ~mvt_predicate:Mvt.is_account_courant ~at:until ops in

  Printf.printf "%04d-%02d-%02d\n" yf mf df;
  Printf.printf "CAISSE : %.2f\n" caisse_dbt;
  Printf.printf "COURANT : %.2f\n" courant_dbt;

  bilan ~mvt_predicate:Mvt.any ~from ~until ops ();

  Printf.printf "%04d-%02d-%02d\n" yu mu du;
  Printf.printf "CAISSE : %.2f\n" caisse_fin;
  Printf.printf "COURANT : %.2f\n" courant_fin

let () = main ~from:(2020, 11, 1) ~until:(2021, 5, 31) ()