165 lines
4.7 KiB
Scheme
165 lines
4.7 KiB
Scheme
;;
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;; members-payments.scm
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;;
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;; Adding payment information to member records from bank account statement.
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;;
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;; ISC License
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;;
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;; Copyright 2023 Brmlab, z.s.
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;; Dominik Pantůček <dominik.pantucek@trustica.cz>
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;;
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;; Permission to use, copy, modify, and/or distribute this software
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;; for any purpose with or without fee is hereby granted, provided
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;; that the above copyright notice and this permission notice appear
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;; in all copies.
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;;
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;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
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;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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;;
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(declare (unit members-payments))
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(module
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members-payments
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(
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member-payments-total
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members-payments-process
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member-balance
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member-total-balance
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)
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(import scheme
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(chicken base)
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(chicken string)
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(chicken io)
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(chicken irregex)
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(chicken sort)
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(chicken process-context)
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(chicken pathname)
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bank-account
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member-record
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members-base
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bank-fio
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dictionary
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member-fees
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period
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configuration)
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;; Exchange rates
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(define exchange-rates-lookup-table
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(make-period-lookup-table
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'(((2010 1) 25))))
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;; Lookup CZK/EUR
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(define (lookup-eur-rate)
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(car (lookup-by-period exchange-rates-lookup-table)))
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;; Extract probable member-id from transaction
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(define (transaction-extract-member-id transaction)
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(if (equal? (bank-transaction-type transaction) "Poplatek")
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#f
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(let* ((varsym-id0
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(if (*jendasap-compat*) ;; JendaSAP - whole string
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(bank-transaction-varsym transaction)
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(string->number
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(bank-transaction-varsym transaction))))
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(varsym-id
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(or varsym-id0
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(let* ((msg (bank-transaction-message transaction))
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(ci (substring-index "," msg))
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(vs (if ci
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(substring msg 0 ci)
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msg)))
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(string->number vs)))))
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varsym-id)))
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;; Special comparator with JendaSAP hack
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(define (compare-member-id member-id bank-varsym)
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(if (*jendasap-compat*)
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(equal? bank-varsym (number->string member-id))
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(eq? member-id bank-varsym)))
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;; Merges bank account statement into members payment keys. The
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;; payment key will be a list of transactions.
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(define (members-payments-process-bank mb ba)
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(let loop ((mb mb)
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(transactions (bank-account-transactions ba)))
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(if (null? transactions)
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mb
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(let* ((transaction (car transactions))
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(varsym-id (transaction-extract-member-id transaction)))
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(loop (members-base-update mb
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(lambda (mr)
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(compare-member-id (member-id mr) varsym-id))
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(lambda (mr)
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(member-record-add-payment mr transaction)))
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(cdr transactions))))))
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;; Reads the payments
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(define (load-accounts-list apikeys)
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(map (compose car string-split)
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(read-lines
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(open-input-file apikeys))))
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;; Loads all accounts - it expects .csv files in given directory.
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(define (load-accounts accounts-list dir)
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(map (lambda (acc)
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(bank-fio-parse (make-pathname dir (string-append acc ".csv"))))
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accounts-list))
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;; If apikeys is not #f, loads the account numbers, loads bank
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;; accounts and processes transactions.
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(define (members-payments-process mb apikeys-file dir)
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(if apikeys-file
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(let* ((accounts (load-accounts
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(load-accounts-list apikeys-file)
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dir)))
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(map member-sort-payments
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(foldl members-payments-process-bank
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mb
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accounts)))
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mb))
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;; Adds all balances - payments are converted to CZK in member-payments-total
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(define (member-sort-payments mr)
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(dict-set mr
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'payments
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(sort (dict-ref mr 'payments '())
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(lambda (a b)
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(string<? (bank-transaction-date a)
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(bank-transaction-date b))))))
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;; Balances totals
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(define (member-balance mr)
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(make-dict `((fees . ,(member-fees-total mr))
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(credit . ,(member-credit-total mr))
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(payment . ,(member-payments-total mr)))))
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;; Computes total member balance from credit, fees and payment
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;; information
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(define (member-total-balance mr)
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(let* ((bal (member-balance mr))
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(fees (dict-ref bal 'fees 0))
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(credit (dict-ref bal 'credit 0))
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(payment (dict-ref bal 'payment)))
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(- (+ credit payment) fees)))
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;; Total amount paid - calculated from payments
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(define (member-payments-total mr)
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(foldl + 0 (map (lambda (tr)
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(let ((amount (bank-transaction-amount tr))
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(currency (bank-transaction-currency tr)))
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(case currency
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((CZK) amount)
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((EUR) (* amount (lookup-eur-rate)))
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(else 0))))
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(member-payments mr))))
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)
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