;;
;; bar-db.scm
;;
;; Bar database queries.
;;
;; ISC License
;;
;; Copyright 2023-2025 Brmlab, z.s.
;; Dominik Pantůček <dominik.pantucek@trustica.cz>
;;
;; Permission to use, copy, modify, and/or distribute this software
;; for any purpose with or without fee is hereby granted, provided
;; that the above copyright notice and this permission notice appear
;; in all copies.
;; 
;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
;;

(declare (unit bar-db))

(module
    bar-db
    (
     bar-db-init!
     bd-barcode-lookup
     )

  (import scheme
	  (chicken base)
	  postgresql
	  sql-null)

  (define bd-conn (make-parameter #f))

  (define (bar-db-init! name host user pass)
    (bd-conn
     (connect
      `((dbname . ,name)
	,@(if host
	      `((host . ,host))
	      '())
	,@(if user
	      `((user . ,user)
		(password . ,pass))
	      '())))))

  (define (sql-null->symbol v)
    (if (sql-null? v)
	'null
	v))

  (define (bd-barcode-lookup bc)
    (sql-null->symbol
     (car
      (row-values
       (query
	(bd-conn)
	"select sum(amount*case side when 'credit' then -1 else 1 end) amt from transaction_splits where account=(select account from barcodes where barcode=$1)"
	bc)))))

  )