;;
;; mailman3-sql.scm
;;
;; Mailman management interface - Mailman version 3.x - direct SQLite3
;; DB support
;;
;; ISC License
;;
;; Copyright 2023 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 mailman3-sql)
	 (uses sqlite3))

(module
 mailman3-sql
 (
  list-mailman3-sql-lists
  list-mailman3-sql-list-members
  )
 (import scheme
	 (chicken base)
	 (chicken format)
	 sqlite3
	 configuration)

 ;; Thread-local parameter to re-use SQLite3 DB handle for subsequent queries
 (define *cached-mailman3-db* (make-parameter #f))

 ;; Returns (possibly cached) SQLite3 DB handle
 (define (mailman3-db)
   (when (not (*cached-mailman3-db*))
     (*cached-mailman3-db* (open-database (*mailman3-sql-path*))))
   (*cached-mailman3-db*))

 ;; Returns the list of mailman3 mailinglists by querying te
 ;; underlying SQLite3 DB directly
 (define (list-mailman3-sql-lists)
   (let-values (((stmt _)
		 (prepare (mailman3-db)
			  "SELECT list_name FROM mailinglist")))
     (map-row identity stmt)))

 ;; Returns a list of email addresses subscribed to given mailinglist
 (define (list-mailman3-sql-list-members lst)
   (let-values (((stmt _)
		 (prepare (mailman3-db)
			  "SELECT DISTINCT address.email
                           FROM member
                           LEFT JOIN address
                             ON member.address_id=address.id
                           WHERE list_id=? AND role=1")))
     (map-row identity
	      stmt
	      (format "~A.brmlab.cz" lst))))
 
 )