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|
namespace FundLab.Domain
open System
module CapitalPolicy =
let cashMaximum = 999999999999999999.99m
let validateDeposit (amount: decimal) : Result<unit, string> =
if amount <= 0m then
Error "deposit amount must be positive"
elif Decimal.Round(amount, 2) <> amount then
Error "deposit amount exceeds cash precision"
elif amount > cashMaximum then
Error "deposit amount exceeds database precision"
else
Ok ()
let settle (availableCash: decimal) (amount: decimal) : Result<decimal, string> =
match validateDeposit amount with
| Error message -> Error message
| Ok() ->
let updated = availableCash + amount
if updated > cashMaximum then
Error "available cash exceeds database precision"
else
Ok updated
|
